/* ==========================================================================
   Kitsuku design system
   Layered after style.css so legacy screens inherit the new tokens too.
   ========================================================================== */

:root {
    --k-bg: #f6f2ea;
    --k-bg-wash: #efe8db;
    --k-surface: #fffdf8;
    --k-surface-2: #f4efe5;
    --k-surface-3: #ebe3d5;
    --k-ink: #231f1a;
    --k-ink-soft: #4b443b;
    --k-muted: #7b7164;
    --k-line: #e4dacb;
    --k-line-strong: #d3c5b2;
    --k-accent: #a63d2f;
    --k-accent-hover: #8b3024;
    --k-accent-soft: #f7e7e1;
    --k-gold: #a37a2d;
    --k-gold-soft: #f6eeda;
    --k-success: #3d7458;
    --k-success-soft: #e6f1e9;
    --k-danger: #b04338;
    --k-danger-soft: #fae9e6;
    --k-info: #3e647f;
    --k-info-soft: #e7f0f5;
    --k-ring: rgba(166, 61, 47, 0.25);
    --k-shadow-xs: 0 1px 2px rgba(45, 36, 26, 0.05);
    --k-shadow-sm: 0 4px 14px rgba(45, 36, 26, 0.06);
    --k-shadow-md: 0 14px 40px rgba(45, 36, 26, 0.1);
    --k-shadow-lg: 0 28px 70px rgba(45, 36, 26, 0.16);
    --k-radius-sm: 0.55rem;
    --k-radius: 0.9rem;
    --k-radius-lg: 1.35rem;
    --k-radius-xl: 2rem;
    --k-sidebar-width: 264px;
    --k-topbar-height: 64px;
    --k-font: "Inter", "Noto Sans JP", system-ui, -apple-system, "Segoe UI", sans-serif;
    --k-font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
    --k-font-serif: "Shippori Mincho", "Noto Serif JP", "Iowan Old Style", Georgia, serif;

    /* Legacy aliases: old pages use these everywhere. */
    --bg-color: var(--k-bg);
    --bg-primary: var(--k-surface);
    --surface-color: var(--k-surface);
    --text-primary: var(--k-ink);
    --text-secondary: var(--k-muted);
    --text-muted: var(--k-muted);
    --primary-color: var(--k-accent);
    --primary-hover: var(--k-accent-hover);
    --primary-light: var(--k-accent-soft);
    --success-color: var(--k-success);
    --success-hover: #326149;
    --danger-color: var(--k-danger);
    --danger-hover: #96392f;
    --border-color: var(--k-line);
    --shadow-sm: var(--k-shadow-xs);
    --shadow-md: var(--k-shadow-sm);
    --shadow-lg: var(--k-shadow-md);
    --radius-md: var(--k-radius);
    --radius-lg: var(--k-radius-lg);
    --radius-xl: var(--k-radius-xl);
}

html[data-theme="dark"],
body.night-light {
    --k-bg: #121110;
    --k-bg-wash: #191714;
    --k-surface: #1c1a17;
    --k-surface-2: #23201c;
    --k-surface-3: #2b2721;
    --k-ink: #f3ece1;
    --k-ink-soft: #d8cdc0;
    --k-muted: #a99c8d;
    --k-line: #342e27;
    --k-line-strong: #453d33;
    --k-accent: #e08a70;
    --k-accent-hover: #eda48d;
    --k-accent-soft: #38241f;
    --k-gold: #d0a55c;
    --k-gold-soft: #30281a;
    --k-success: #79b594;
    --k-success-soft: #1e2f26;
    --k-danger: #ef9387;
    --k-danger-soft: #35211f;
    --k-info: #92b9ce;
    --k-info-soft: #1e2b32;
    --k-ring: rgba(224, 138, 112, 0.28);
    --k-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --k-shadow-sm: 0 6px 20px rgba(0, 0, 0, 0.28);
    --k-shadow-md: 0 18px 44px rgba(0, 0, 0, 0.36);
    --k-shadow-lg: 0 32px 80px rgba(0, 0, 0, 0.48);

    --bg-color: var(--k-bg);
    --bg-primary: var(--k-surface);
    --surface-color: var(--k-surface);
    --text-primary: var(--k-ink);
    --text-secondary: var(--k-muted);
    --text-muted: var(--k-muted);
    --primary-color: var(--k-accent);
    --primary-hover: var(--k-accent-hover);
    --primary-light: var(--k-accent-soft);
    --success-color: var(--k-success);
    --danger-color: var(--k-danger);
    --border-color: var(--k-line);
    --shadow-sm: var(--k-shadow-xs);
    --shadow-md: var(--k-shadow-sm);
    --shadow-lg: var(--k-shadow-md);
}

html {
    color-scheme: light;
    scroll-behavior: smooth;
}

html[data-theme="dark"] {
    color-scheme: dark;
}

body {
    font-family: var(--k-font);
    background: var(--k-bg);
    color: var(--k-ink);
    min-height: 100vh;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
}

body.night-light {
    background: var(--k-bg);
    color: var(--k-ink);
}

::selection {
    background: var(--k-accent-soft);
    color: var(--k-accent);
}

:focus-visible {
    outline: 2px solid var(--k-accent);
    outline-offset: 2px;
}

h1, h2, h3, h4, h5 {
    color: var(--k-ink);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

p {
    line-height: 1.7;
}

a {
    color: inherit;
}

img {
    max-width: 100%;
}

.k-skip {
    position: absolute;
    left: 1rem;
    top: -4rem;
    z-index: 200;
    padding: 0.65rem 1rem;
    border-radius: var(--k-radius-sm);
    background: var(--k-ink);
    color: var(--k-bg);
    font-weight: 600;
}

.k-skip:focus {
    top: 1rem;
}

/* --------------------------------------------------------------------------
   Typography helpers
   -------------------------------------------------------------------------- */

.k-jp,
.jp {
    font-family: var(--k-font-jp);
    letter-spacing: 0.02em;
    line-height: 1.75;
    word-break: break-word;
}

.k-serif {
    font-family: var(--k-font-serif);
}

.k-muted {
    color: var(--k-muted);
}

.k-small {
    font-size: 0.8125rem;
}

.k-micro {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.k-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--k-accent);
}

.k-eyebrow::before {
    content: "";
    width: 1.6rem;
    height: 1px;
    background: currentColor;
}

.k-title {
    font-size: clamp(1.6rem, 3.2vw, 2.35rem);
    letter-spacing: -0.035em;
}

.k-subtitle {
    color: var(--k-muted);
    font-size: 0.95rem;
    max-width: 62ch;
}

.k-jp ruby {
    ruby-align: center;
}

.k-jp rt {
    font-size: 0.52em;
    color: var(--k-muted);
    font-weight: 500;
    letter-spacing: 0.04em;
}

.k-divider {
    height: 1px;
    background: var(--k-line);
    border: 0;
    margin: 1.5rem 0;
}

/* --------------------------------------------------------------------------
   Shell
   -------------------------------------------------------------------------- */

.k-shell {
    min-height: 100vh;
}

.k-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--k-sidebar-width);
    z-index: 80;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.35rem 1rem 1rem;
    background: var(--k-surface);
    border-right: 1px solid var(--k-line);
}

.k-brand {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.35rem 0.55rem 0.9rem;
    border-bottom: 1px solid var(--k-line);
}

.k-brand-mark {
    width: 38px;
    height: 38px;
    object-fit: contain;
    flex: 0 0 auto;
}

.k-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.k-brand-name {
    font-weight: 800;
    font-size: 1.02rem;
    letter-spacing: -0.02em;
}

.k-brand-sub {
    font-size: 0.63rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--k-muted);
    margin-top: 0.2rem;
}

.k-brand-jp {
    margin-left: auto;
    font-family: var(--k-font-jp);
    font-size: 0.78rem;
    color: var(--k-muted);
    writing-mode: vertical-rl;
    letter-spacing: 0.18em;
}

.k-logo-light { display: block; }
.k-logo-dark { display: none; }

html[data-theme="dark"] .k-logo-light,
body.night-light .k-logo-light { display: none; }

html[data-theme="dark"] .k-logo-dark,
body.night-light .k-logo-dark { display: block; }

.k-nav {
    flex: 1;
    overflow-y: auto;
    padding: 0.25rem;
    scrollbar-width: thin;
}

.k-nav-group {
    margin-bottom: 1.2rem;
}

.k-nav-label {
    padding: 0 0.65rem;
    margin-bottom: 0.45rem;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--k-muted);
}

.k-nav-link {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.62rem 0.65rem;
    border-radius: var(--k-radius-sm);
    color: var(--k-ink-soft);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 150ms ease, color 150ms ease, transform 150ms ease;
}

.k-nav-link i {
    width: 1.15rem;
    text-align: center;
    color: var(--k-muted);
    font-size: 0.92rem;
    transition: color 150ms ease;
}

.k-nav-link:hover {
    background: var(--k-surface-2);
    color: var(--k-ink);
}

.k-nav-link.is-active {
    background: var(--k-accent-soft);
    color: var(--k-accent);
    font-weight: 600;
}

.k-nav-link.is-active i {
    color: var(--k-accent);
}

.k-nav-badge {
    margin-left: auto;
    min-width: 1.4rem;
    padding: 0.08rem 0.4rem;
    border-radius: 999px;
    background: var(--k-accent);
    color: #fff;
    font-size: 0.66rem;
    font-weight: 700;
    text-align: center;
}

.k-sidebar-foot {
    border-top: 1px solid var(--k-line);
    padding-top: 0.85rem;
    display: grid;
    gap: 0.5rem;
}

.k-sidebar-user {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.45rem 0.55rem;
    border-radius: var(--k-radius-sm);
}

.k-sidebar-user:hover {
    background: var(--k-surface-2);
}

.k-sidebar-user-info {
    min-width: 0;
    line-height: 1.3;
}

.k-sidebar-user-name {
    display: block;
    font-size: 0.83rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.k-sidebar-user-meta {
    display: block;
    font-size: 0.7rem;
    color: var(--k-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.k-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--k-surface-3);
    color: var(--k-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    flex: 0 0 auto;
    border: 1px solid var(--k-line);
}

.k-avatar-lg {
    width: 68px;
    height: 68px;
    font-size: 1.25rem;
}

.k-avatar-sm {
    width: 26px;
    height: 26px;
    font-size: 0.62rem;
}

.k-sidebar-actions {
    display: flex;
    gap: 0.35rem;
    padding: 0 0.35rem;
}

.k-main {
    margin-left: var(--k-sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.k-topbar {
    position: sticky;
    top: 0;
    z-index: 60;
    height: var(--k-topbar-height);
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0 1.6rem;
    background: color-mix(in srgb, var(--k-bg) 86%, transparent);
    border-bottom: 1px solid var(--k-line);
    backdrop-filter: blur(16px);
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
    .k-topbar { background: var(--k-bg); }
}

.k-topbar-title {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--k-muted);
}

.k-topbar-spacer {
    flex: 1;
}

.k-topbar-search {
    position: relative;
    width: min(280px, 30vw);
}

.k-topbar-search input {
    width: 100%;
    height: 38px;
    padding: 0 0.8rem 0 2.1rem;
    border-radius: 999px;
    border: 1px solid var(--k-line);
    background: var(--k-surface);
    color: var(--k-ink);
    font-size: 0.82rem;
}

.k-topbar-search i {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    color: var(--k-muted);
}

.k-menu-btn {
    display: none;
}

.k-page {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 2rem 1.75rem 4rem;
    flex: 1;
}

.k-page-wide {
    max-width: 1420px;
}

.k-page-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 1.8rem;
    flex-wrap: wrap;
}

.k-page-head h1 {
    margin: 0.3rem 0 0.5rem;
}

.k-page-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.k-footer {
    border-top: 1px solid var(--k-line);
    padding: 1.2rem 1.75rem;
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.75rem;
    color: var(--k-muted);
}

.k-mobile-nav,
.k-mobile-scrim {
    display: none;
}

/* --------------------------------------------------------------------------
   Buttons, icon buttons, chips
   -------------------------------------------------------------------------- */

.k-btn {
    --k-btn-bg: var(--k-surface);
    --k-btn-ink: var(--k-ink);
    --k-btn-border: var(--k-line);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 42px;
    padding: 0.6rem 1rem;
    border: 1px solid var(--k-btn-border);
    border-radius: var(--k-radius-sm);
    background: var(--k-btn-bg);
    color: var(--k-btn-ink);
    font-size: 0.87rem;
    font-weight: 600;
    line-height: 1.2;
    cursor: pointer;
    transition: background 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms ease, box-shadow 150ms ease;
    white-space: nowrap;
}

.k-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--k-shadow-xs);
}

.k-btn:active {
    transform: translateY(0);
}

.k-btn:disabled,
.k-btn[aria-disabled="true"] {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.k-btn-primary {
    --k-btn-bg: var(--k-accent);
    --k-btn-ink: #fff8f3;
    --k-btn-border: var(--k-accent);
    box-shadow: var(--k-shadow-xs);
}

html[data-theme="dark"] .k-btn-primary,
body.night-light .k-btn-primary {
    --k-btn-ink: #201512;
}

.k-btn-primary:hover {
    --k-btn-bg: var(--k-accent-hover);
    --k-btn-border: var(--k-accent-hover);
}

.k-btn-ghost {
    --k-btn-bg: transparent;
    --k-btn-border: transparent;
    color: var(--k-muted);
}

.k-btn-ghost:hover {
    --k-btn-bg: var(--k-surface-2);
    color: var(--k-ink);
}

.k-btn-soft {
    --k-btn-bg: var(--k-accent-soft);
    --k-btn-ink: var(--k-accent);
    --k-btn-border: transparent;
}

.k-btn-danger {
    --k-btn-bg: var(--k-danger-soft);
    --k-btn-ink: var(--k-danger);
    --k-btn-border: transparent;
}

.k-btn-success {
    --k-btn-bg: var(--k-success);
    --k-btn-ink: #f7fbf8;
    --k-btn-border: var(--k-success);
}

.k-btn-lg {
    min-height: 50px;
    padding: 0.8rem 1.35rem;
    font-size: 0.95rem;
    border-radius: var(--k-radius);
}

.k-btn-sm {
    min-height: 34px;
    padding: 0.35rem 0.7rem;
    font-size: 0.78rem;
}

.k-btn-block {
    width: 100%;
}

.k-btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
}

.k-icon-btn {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid transparent;
    background: transparent;
    color: var(--k-muted);
    cursor: pointer;
    transition: background 150ms ease, color 150ms ease;
}

.k-icon-btn:hover {
    background: var(--k-surface-2);
    color: var(--k-ink);
}

.k-theme-toggle .fa-sun { display: none; }
.k-theme-toggle .fa-moon { display: inline-block; }

html[data-theme="dark"] .k-theme-toggle .fa-sun,
body.night-light .k-theme-toggle .fa-sun { display: inline-block; }

html[data-theme="dark"] .k-theme-toggle .fa-moon,
body.night-light .k-theme-toggle .fa-moon { display: none; }

.k-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.28rem 0.6rem;
    border-radius: 999px;
    border: 1px solid var(--k-line);
    background: var(--k-surface);
    color: var(--k-muted);
    font-size: 0.72rem;
    font-weight: 600;
}

.k-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1.4;
    background: var(--k-surface-2);
    color: var(--k-muted);
    white-space: nowrap;
}

.k-badge-accent { background: var(--k-accent-soft); color: var(--k-accent); }
.k-badge-success { background: var(--k-success-soft); color: var(--k-success); }
.k-badge-danger { background: var(--k-danger-soft); color: var(--k-danger); }
.k-badge-info { background: var(--k-info-soft); color: var(--k-info); }
.k-badge-gold { background: var(--k-gold-soft); color: var(--k-gold); }

.k-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    flex: 0 0 auto;
}

.k-kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.35rem;
    height: 1.35rem;
    padding: 0 0.32rem;
    border-radius: 0.35rem;
    border: 1px solid var(--k-line-strong);
    background: var(--k-surface);
    color: var(--k-muted);
    font-family: var(--k-font);
    font-size: 0.66rem;
    font-weight: 700;
    box-shadow: 0 1px 0 var(--k-line-strong);
}

/* --------------------------------------------------------------------------
   Cards and layout primitives
   -------------------------------------------------------------------------- */

.k-card {
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    box-shadow: var(--k-shadow-xs);
}

.k-card-pad {
    padding: 1.5rem;
}

.k-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.1rem 1.4rem;
    border-bottom: 1px solid var(--k-line);
}

.k-card-head h2,
.k-card-head h3 {
    margin: 0;
    font-size: 0.98rem;
}

.k-card-body {
    padding: 1.4rem;
}

.k-panel {
    background: var(--k-surface-2);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
}

.k-panel-pad {
    padding: 1rem 1.15rem;
}

.k-grid {
    display: grid;
    gap: 1rem;
}

.k-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.k-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.k-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.k-split {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, 1fr);
    gap: 1.25rem;
    align-items: start;
}

.k-stack {
    display: grid;
    gap: 1rem;
}

.k-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.k-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.k-wrap {
    flex-wrap: wrap;
}

.k-grow { flex: 1; }

.k-mt-0 { margin-top: 0; }
.k-mt-1 { margin-top: 0.5rem; }
.k-mt-2 { margin-top: 1rem; }
.k-mt-3 { margin-top: 1.5rem; }
.k-mt-4 { margin-top: 2rem; }
.k-mb-0 { margin-bottom: 0; }
.k-mb-1 { margin-bottom: 0.5rem; }
.k-mb-2 { margin-bottom: 1rem; }
.k-mb-3 { margin-bottom: 1.5rem; }

.k-empty {
    text-align: center;
    padding: 2.6rem 1.25rem;
    color: var(--k-muted);
}

.k-empty i {
    display: block;
    font-size: 1.6rem;
    margin-bottom: 0.8rem;
    color: var(--k-line-strong);
}

.k-empty strong {
    display: block;
    color: var(--k-ink);
    margin-bottom: 0.35rem;
}

/* --------------------------------------------------------------------------
   Stats
   -------------------------------------------------------------------------- */

.k-stat {
    position: relative;
    padding: 1.15rem 1.25rem;
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    overflow: hidden;
}

.k-stat-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--k-muted);
}

.k-stat-value {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
    margin-top: 0.45rem;
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    color: var(--k-ink);
}

.k-stat-value small {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--k-muted);
    letter-spacing: 0;
}

.k-stat-foot {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--k-muted);
}

.k-stat-accent .k-stat-value { color: var(--k-accent); }
.k-stat-gold .k-stat-value { color: var(--k-gold); }
.k-stat-success .k-stat-value { color: var(--k-success); }

.k-stat-deco {
    position: absolute;
    right: 0.8rem;
    top: 0.7rem;
    font-size: 1.4rem;
    color: var(--k-line-strong);
    opacity: 0.55;
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */

.k-field {
    display: grid;
    gap: 0.4rem;
}

.k-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--k-ink-soft);
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
}

.k-input,
.k-select,
.k-textarea,
.k-form input[type="text"],
.k-form input[type="email"],
.k-form input[type="password"],
.k-form input[type="number"],
.k-form input[type="search"],
.k-form select,
.k-form textarea {
    width: 100%;
    min-height: 44px;
    padding: 0.65rem 0.8rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface);
    color: var(--k-ink);
    font-family: var(--k-font);
    font-size: 0.9rem;
    line-height: 1.5;
    transition: border-color 150ms ease, box-shadow 150ms ease;
}

.k-input:focus,
.k-select:focus,
.k-textarea:focus,
.k-form input:focus,
.k-form select:focus,
.k-form textarea:focus {
    outline: none;
    border-color: var(--k-accent);
    box-shadow: 0 0 0 3px var(--k-ring);
}

.k-textarea {
    min-height: 110px;
    resize: vertical;
}

.k-help {
    font-size: 0.75rem;
    color: var(--k-muted);
    line-height: 1.5;
}

.k-error {
    font-size: 0.76rem;
    color: var(--k-danger);
    font-weight: 500;
}

.k-form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.k-form-grid .k-span-2 {
    grid-column: 1 / -1;
}

.k-check {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    font-size: 0.84rem;
    color: var(--k-ink-soft);
    cursor: pointer;
}

.k-check input[type="checkbox"],
.k-check input[type="radio"] {
    appearance: none;
    width: 1.1rem;
    height: 1.1rem;
    margin-top: 0.12rem;
    border: 1.5px solid var(--k-line-strong);
    border-radius: 0.3rem;
    background: var(--k-surface);
    display: inline-grid;
    place-content: center;
    flex: 0 0 auto;
    cursor: pointer;
}

.k-check input[type="radio"] {
    border-radius: 50%;
}

.k-check input:checked {
    background: var(--k-accent);
    border-color: var(--k-accent);
}

.k-check input:checked::after {
    content: "";
    width: 0.28rem;
    height: 0.55rem;
    border-right: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(45deg) translate(-1px, -1px);
}

.k-check input[type="radio"]:checked::after {
    width: 0.38rem;
    height: 0.38rem;
    border-radius: 50%;
    border: 0;
    background: #fff;
    transform: none;
}

.k-input-group {
    position: relative;
}

.k-input-group .k-input {
    padding-left: 2.3rem;
}

.k-input-group > i {
    position: absolute;
    left: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--k-muted);
    font-size: 0.8rem;
}

.k-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    font-size: 0.84rem;
}

.k-switch input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.k-switch-track {
    width: 2.4rem;
    height: 1.35rem;
    border-radius: 999px;
    background: var(--k-surface-3);
    border: 1px solid var(--k-line);
    position: relative;
    transition: background 150ms ease;
    flex: 0 0 auto;
}

.k-switch-track::after {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: var(--k-surface);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform 150ms ease;
}

.k-switch input:checked + .k-switch-track {
    background: var(--k-accent);
    border-color: var(--k-accent);
}

.k-switch input:checked + .k-switch-track::after {
    transform: translateX(1.02rem);
}

/* Legacy form/button compatibility */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.62rem 1rem;
    border-radius: var(--k-radius-sm);
    border: 1px solid var(--k-line);
    background: var(--k-surface);
    color: var(--k-ink);
    font-family: var(--k-font);
    font-weight: 600;
    font-size: 0.88rem;
    line-height: 1.2;
    text-decoration: none;
    cursor: pointer;
    transition: all 150ms ease;
}

.btn:hover {
    border-color: var(--k-line-strong);
    background: var(--k-surface-2);
}

.btn-primary {
    background: var(--k-accent);
    border-color: var(--k-accent);
    color: #fff8f3;
}

.btn-primary:hover {
    background: var(--k-accent-hover);
    border-color: var(--k-accent-hover);
    color: #fff8f3;
}

.btn-outline {
    background: transparent;
    border-color: var(--k-line-strong);
    color: var(--k-ink-soft);
}

.btn-danger {
    background: var(--k-danger-soft);
    border-color: transparent;
    color: var(--k-danger);
}

.btn-success {
    background: var(--k-success);
    border-color: var(--k-success);
    color: #f7fbf8;
}

.card {
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    box-shadow: var(--k-shadow-xs);
    color: var(--k-ink);
}

input,
select,
textarea,
button {
    font-family: var(--k-font);
}

.text-muted {
    color: var(--k-muted);
}

.form-input {
    background: var(--k-surface);
    color: var(--k-ink);
    border-color: var(--k-line);
}

/* --------------------------------------------------------------------------
   Alerts, flashes, toasts
   -------------------------------------------------------------------------- */

.k-alert {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.8rem 1rem;
    border-radius: var(--k-radius-sm);
    border: 1px solid transparent;
    font-size: 0.84rem;
    line-height: 1.55;
}

.k-alert i {
    margin-top: 0.18rem;
}

.k-alert-success {
    background: var(--k-success-soft);
    border-color: color-mix(in srgb, var(--k-success) 22%, transparent);
    color: var(--k-success);
}

.k-alert-danger {
    background: var(--k-danger-soft);
    border-color: color-mix(in srgb, var(--k-danger) 22%, transparent);
    color: var(--k-danger);
}

.k-alert-info {
    background: var(--k-info-soft);
    border-color: color-mix(in srgb, var(--k-info) 22%, transparent);
    color: var(--k-info);
}

.k-alert-warning {
    background: var(--k-gold-soft);
    border-color: color-mix(in srgb, var(--k-gold) 26%, transparent);
    color: var(--k-gold);
}

.k-toast-stack {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 300;
    display: grid;
    gap: 0.55rem;
    width: min(380px, calc(100vw - 2rem));
}

.k-toast {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.85rem 1rem;
    background: var(--k-ink);
    color: var(--k-bg);
    border-radius: var(--k-radius);
    box-shadow: var(--k-shadow-md);
    font-size: 0.84rem;
    animation: k-toast-in 240ms ease both;
}

.k-toast-success { background: #295a43; color: #effaf4; }
.k-toast-error { background: #7d2c25; color: #fff2f0; }
.k-toast-info { background: #2c4c60; color: #eff8fd; }

.k-toast button {
    margin-left: auto;
    border: 0;
    background: transparent;
    color: inherit;
    opacity: 0.7;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
}

@keyframes k-toast-in {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   Progress, bars, strength meter
   -------------------------------------------------------------------------- */

.k-progress {
    height: 6px;
    border-radius: 999px;
    background: var(--k-surface-3);
    overflow: hidden;
}

.k-progress-fill {
    height: 100%;
    border-radius: inherit;
    background: var(--k-accent);
    transition: width 300ms ease;
}

.k-progress-soft .k-progress-fill {
    background: var(--k-success);
}

.k-progress-lg {
    height: 10px;
}

.k-legend {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.72rem;
    color: var(--k-muted);
}

.k-legend span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.k-bars {
    display: flex;
    align-items: flex-end;
    gap: 0.55rem;
    height: 130px;
    padding-top: 1rem;
}

.k-bar-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    height: 100%;
    justify-content: flex-end;
    min-width: 0;
}

.k-bar {
    width: 100%;
    max-width: 34px;
    min-height: 3px;
    border-radius: 0.35rem 0.35rem 0.15rem 0.15rem;
    background: var(--k-surface-3);
    position: relative;
}

.k-bar.is-filled {
    background: var(--k-accent);
}

.k-bar.is-today {
    background: var(--k-gold);
}

.k-bar-value {
    font-size: 0.66rem;
    color: var(--k-muted);
    font-weight: 600;
}

.k-bar-label {
    font-size: 0.66rem;
    color: var(--k-muted);
    white-space: nowrap;
}

.k-heatmap {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.35rem;
}

.k-heat-cell {
    aspect-ratio: 1;
    border-radius: 0.25rem;
    background: var(--k-surface-3);
}

.k-heat-1 { background: color-mix(in srgb, var(--k-success) 25%, var(--k-surface-3)); }
.k-heat-2 { background: color-mix(in srgb, var(--k-success) 45%, var(--k-surface-3)); }
.k-heat-3 { background: color-mix(in srgb, var(--k-success) 70%, var(--k-surface-3)); }
.k-heat-4 { background: var(--k-success); }

.k-meter {
    height: 9px;
    background: var(--k-surface-3);
    border-radius: 999px;
    overflow: hidden;
    display: flex;
}

.k-meter span {
    display: block;
    height: 100%;
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */

.k-table-wrap {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface);
}

.k-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.84rem;
}

.k-table th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: 0.66rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--k-muted);
    border-bottom: 1px solid var(--k-line);
    background: var(--k-surface-2);
    white-space: nowrap;
    font-weight: 700;
}

.k-table td {
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--k-line);
    vertical-align: middle;
}

.k-table tr:last-child td {
    border-bottom: 0;
}

.k-table tbody tr:hover {
    background: var(--k-surface-2);
}

.k-table .k-actions {
    display: flex;
    gap: 0.35rem;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.k-pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    font-size: 0.78rem;
    color: var(--k-muted);
}

.k-pagination nav {
    display: flex;
}

.k-pagination svg {
    width: 1rem;
    height: 1rem;
}

/* --------------------------------------------------------------------------
   Tabs and modals
   -------------------------------------------------------------------------- */

.k-tabs {
    display: flex;
    gap: 0.25rem;
    border-bottom: 1px solid var(--k-line);
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--k-line) transparent;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
}

.k-tabs::-webkit-scrollbar {
    height: 4px;
}

.k-tabs::-webkit-scrollbar-track {
    background: transparent;
}

.k-tabs::-webkit-scrollbar-thumb {
    background: var(--k-line);
    border-radius: 4px;
}

.k-tab {
    position: relative;
    padding: 0.65rem 0.8rem;
    border: 0;
    background: transparent;
    color: var(--k-muted);
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.k-tab::after {
    content: "";
    position: absolute;
    left: 0.55rem;
    right: 0.55rem;
    bottom: -1px;
    height: 2px;
    border-radius: 2px;
    background: transparent;
}

.k-tab.is-active {
    color: var(--k-ink);
}

.k-tab.is-active::after {
    background: var(--k-accent);
}

.k-modal {
    position: fixed;
    inset: 0;
    z-index: 250;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
}

.k-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(18, 15, 11, 0.62);
    backdrop-filter: blur(5px);
}

.k-modal-panel {
    position: relative;
    z-index: 1;
    width: min(540px, 100%);
    max-height: min(88vh, 820px);
    overflow-y: auto;
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    box-shadow: var(--k-shadow-lg);
    padding: 1.6rem;
}

.k-modal-panel-sm {
    width: min(420px, 100%);
}

.k-modal-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.k-modal-head h3 {
    margin: 0.15rem 0 0.25rem;
    font-size: 1.15rem;
}

.k-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.6rem;
    margin-top: 1.4rem;
}

/* --------------------------------------------------------------------------
   Dashboard
   -------------------------------------------------------------------------- */

.k-greeting {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.k-greeting h1 {
    font-size: clamp(1.7rem, 3.4vw, 2.5rem);
    margin: 0.35rem 0 0.35rem;
    letter-spacing: -0.045em;
}

.k-today {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 1fr);
    gap: 1.15rem;
    margin-bottom: 1.4rem;
}

.k-today-main {
    position: relative;
    overflow: hidden;
    padding: 1.6rem;
    border-radius: var(--k-radius-lg);
    background: linear-gradient(145deg, var(--k-ink) 0%, #3a2b24 100%);
    color: #f8f0e6;
    border: 1px solid #3a2b24;
}

html[data-theme="dark"] .k-today-main,
body.night-light .k-today-main {
    background: linear-gradient(145deg, #2a231d 0%, #1b1714 100%);
    border-color: var(--k-line);
}

.k-today-main::after {
    content: "今日";
    position: absolute;
    right: -0.5rem;
    bottom: -2.3rem;
    font-family: var(--k-font-jp);
    font-size: 10rem;
    line-height: 1;
    color: rgba(255, 243, 228, 0.07);
    font-weight: 700;
    pointer-events: none;
}

.k-today-main .k-eyebrow {
    color: #e3b28f;
}

.k-today-main h2 {
    color: #fff8f1;
    font-size: clamp(1.35rem, 2.6vw, 1.9rem);
    margin: 0.55rem 0 0.4rem;
    position: relative;
    z-index: 1;
}

.k-today-main p {
    color: rgba(255, 244, 231, 0.7);
    font-size: 0.86rem;
    max-width: 46ch;
    position: relative;
    z-index: 1;
}

.k-today-numbers {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin: 1.35rem 0 1.5rem;
    position: relative;
    z-index: 1;
}

.k-today-number strong {
    display: block;
    font-size: 1.65rem;
    font-weight: 800;
    color: #fff8f1;
    letter-spacing: -0.04em;
    line-height: 1;
}

.k-today-number span {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 244, 231, 0.58);
}

.k-today-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.k-today-actions .k-btn {
    --k-btn-bg: rgba(255, 248, 240, 0.1);
    --k-btn-ink: #fff8f1;
    --k-btn-border: rgba(255, 248, 240, 0.2);
}

.k-today-actions .k-btn-primary {
    --k-btn-bg: #f6ead9;
    --k-btn-ink: #39231c;
    --k-btn-border: #f6ead9;
}

.k-queue-card {
    padding: 1.25rem 1.3rem;
    display: flex;
    flex-direction: column;
}

.k-queue-card h3 {
    font-size: 0.95rem;
    margin: 0 0 0.3rem;
}

.k-queue-list {
    display: grid;
    gap: 0.55rem;
    margin-top: 0.9rem;
}

.k-queue-row {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.55rem 0.65rem;
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    font-size: 0.8rem;
}

.k-queue-row i {
    width: 1rem;
    text-align: center;
    color: var(--k-muted);
}

.k-queue-row strong {
    margin-left: auto;
    font-variant-numeric: tabular-nums;
}

.k-book-shelf {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 1rem;
}

.k-book {
    display: flex;
    gap: 0.9rem;
    padding: 1rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface);
    transition: border-color 150ms ease, transform 150ms ease, box-shadow 150ms ease;
}

.k-book:hover {
    border-color: var(--k-line-strong);
    transform: translateY(-2px);
    box-shadow: var(--k-shadow-sm);
}

.k-book-cover {
    width: 66px;
    height: 88px;
    flex: 0 0 auto;
    border-radius: 0.35rem 0.5rem 0.5rem 0.35rem;
    background: linear-gradient(150deg, #7d3429, #3d2620);
    color: #f6e6d2;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem;
    text-align: center;
    font-family: var(--k-font-serif);
    font-size: 0.72rem;
    line-height: 1.35;
    box-shadow: inset 4px 0 0 rgba(255, 255, 255, 0.12), 0 4px 10px rgba(39, 25, 20, 0.2);
    overflow: hidden;
    position: relative;
}

.k-book-cover img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.k-book-info {
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.k-book-info h3 {
    font-size: 0.9rem;
    margin: 0 0 0.2rem;
    line-height: 1.35;
}

.k-book-info p {
    font-size: 0.72rem;
    color: var(--k-muted);
    margin: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.k-book-meta {
    margin-top: auto;
    padding-top: 0.55rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.68rem;
    color: var(--k-muted);
}

.k-deck-section {
    margin-top: 1.8rem;
}

.k-deck-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.8rem;
    flex-wrap: wrap;
}

.k-deck-head h2 {
    font-size: 1.1rem;
    margin: 0;
}

.k-deck-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.8rem;
}

.k-library-book-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.9rem;
}

.k-library-chapters {
    border-top: 1px solid var(--k-line);
    padding-top: 0.75rem;
}

.k-library-chapters > summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    width: fit-content;
    max-width: 100%;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    color: var(--k-ink-soft);
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
}

.k-library-chapters > summary::-webkit-details-marker { display: none; }
.k-library-chapters > summary::marker { content: ''; }
.k-library-chapters > summary > i { transition: transform 150ms ease; }
.k-library-chapters[open] > summary > i { transform: rotate(180deg); }
.k-library-chapters > .k-deck-grid { margin-top: 0.8rem; }

.k-deck {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    padding: 1rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface);
    transition: border-color 150ms ease, box-shadow 150ms ease;
}

.k-deck:hover {
    border-color: var(--k-line-strong);
    box-shadow: var(--k-shadow-xs);
}

.k-deck-title {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.6rem;
}

.k-deck-title h3 {
    font-size: 0.88rem;
    margin: 0;
    line-height: 1.4;
}

.k-deck-title .k-jp {
    font-size: 0.72rem;
    color: var(--k-muted);
    margin-top: 0.15rem;
    display: block;
}

.k-deck-meta {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex-wrap: wrap;
    font-size: 0.69rem;
    color: var(--k-muted);
}

.k-deck-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.15rem;
}

.k-deck-actions .k-btn {
    flex: 1;
}

/* --------------------------------------------------------------------------
   Admin
   -------------------------------------------------------------------------- */

.k-admin-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.5rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    background:
        radial-gradient(circle at 92% 10%, var(--k-accent-soft) 0%, transparent 38%),
        var(--k-surface);
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

.k-admin-hero h1 {
    font-size: clamp(1.4rem, 2.8vw, 1.9rem);
    margin: 0.3rem 0 0.35rem;
}

.k-admin-nav {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-bottom: 1.4rem;
}

.k-admin-nav a {
    padding: 0.45rem 0.7rem;
    border-radius: var(--k-radius-sm);
    border: 1px solid var(--k-line);
    background: var(--k-surface);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--k-muted);
}

.k-admin-nav a:hover,
.k-admin-nav a.is-active {
    background: var(--k-accent-soft);
    border-color: transparent;
    color: var(--k-accent);
}

.k-admin-search {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.k-admin-search .k-input {
    width: 220px;
    min-height: 38px;
}

.k-admin-search .k-select {
    width: 140px;
    min-height: 38px;
}

.k-user-cell {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-width: 0;
}

.k-user-cell-name {
    display: block;
    font-weight: 600;
    color: var(--k-ink);
    line-height: 1.3;
}

.k-user-cell-meta {
    display: block;
    font-size: 0.72rem;
    color: var(--k-muted);
    line-height: 1.35;
}

.k-chart {
    display: flex;
    align-items: flex-end;
    gap: 0.45rem;
    height: 150px;
    margin-top: 1rem;
}

.k-chart-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    gap: 0.35rem;
    height: 100%;
    min-width: 0;
}

.k-chart-bar {
    width: 100%;
    max-width: 30px;
    min-height: 2px;
    border-radius: 0.3rem 0.3rem 0 0;
    background: var(--k-surface-3);
    position: relative;
}

.k-chart-bar.is-filled {
    background: var(--k-accent);
}

.k-chart-bar.is-today {
    background: var(--k-gold);
}

.k-chart-value {
    font-size: 0.62rem;
    font-weight: 700;
    color: var(--k-muted);
    font-variant-numeric: tabular-nums;
}

.k-chart-label {
    font-size: 0.62rem;
    color: var(--k-muted);
    white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Landing
   -------------------------------------------------------------------------- */

.k-public-bar {
    position: sticky;
    top: 0;
    z-index: 70;
    background: color-mix(in srgb, var(--k-bg) 88%, transparent);
    border-bottom: 1px solid var(--k-line);
    backdrop-filter: blur(16px);
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
    .k-public-bar { background: var(--k-bg); }
}

.k-public-bar-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.k-public-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: auto;
}

.k-public-link {
    padding: 0.5rem 0.7rem;
    border-radius: var(--k-radius-sm);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--k-muted);
}

.k-public-link:hover,
.k-public-link.is-active {
    color: var(--k-ink);
    background: var(--k-surface-2);
}

.k-public-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 0.35rem;
}

.k-landing {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.k-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: center;
    padding: clamp(2.4rem, 7vw, 5rem) 0 clamp(2.6rem, 6vw, 4.5rem);
}

.k-hero-copy h1 {
    font-size: clamp(2.25rem, 5.4vw, 4rem);
    letter-spacing: -0.055em;
    line-height: 1.06;
    margin: 0.7rem 0 1.1rem;
}

.k-hero-copy h1 em {
    font-style: normal;
    color: var(--k-accent);
    position: relative;
    white-space: nowrap;
}

.k-hero-copy h1 em::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0.04em;
    height: 0.12em;
    background: var(--k-accent);
    opacity: 0.22;
    border-radius: 1em;
}

.k-hero-copy > p {
    font-size: clamp(0.95rem, 1.6vw, 1.08rem);
    color: var(--k-muted);
    max-width: 46ch;
    line-height: 1.8;
}

.k-hero-actions {
    display: flex;
    gap: 0.65rem;
    flex-wrap: wrap;
    margin: 1.7rem 0 1.5rem;
}

.k-hero-proof {
    display: flex;
    gap: 1.7rem;
    flex-wrap: wrap;
    padding-top: 1.1rem;
    border-top: 1px solid var(--k-line);
}

.k-proof strong {
    display: block;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.k-proof span {
    font-size: 0.7rem;
    color: var(--k-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.k-hero-art {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 380px;
}

.k-hero-art::before {
    content: "";
    position: absolute;
    width: min(420px, 100%);
    aspect-ratio: 1;
    border-radius: 50%;
    background: radial-gradient(circle at 40% 35%, var(--k-accent-soft) 0%, transparent 66%);
    filter: blur(6px);
}

.k-hero-card {
    position: relative;
    z-index: 1;
    width: min(340px, 100%);
    padding: 1.5rem;
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    box-shadow: var(--k-shadow-md);
    transform: rotate(-2deg);
}

.k-hero-card::before {
    content: "ことば";
    position: absolute;
    top: 0.9rem;
    right: 1.1rem;
    font-family: var(--k-font-jp);
    font-size: 0.65rem;
    letter-spacing: 0.28em;
    color: var(--k-muted);
}

.k-hero-card-jp {
    font-family: var(--k-font-jp);
    font-size: 4rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: 0.04em;
    margin: 0.4rem 0 0.25rem;
}

.k-hero-card-reading {
    font-size: 0.82rem;
    color: var(--k-muted);
    letter-spacing: 0.06em;
}

.k-hero-card-meaning {
    margin-top: 1.1rem;
    padding-top: 1.1rem;
    border-top: 1px dashed var(--k-line-strong);
    font-size: 0.86rem;
    color: var(--k-ink-soft);
}

.k-hero-card-tags {
    display: flex;
    gap: 0.4rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.k-hero-float {
    position: absolute;
    z-index: 2;
    padding: 0.55rem 0.8rem;
    border-radius: var(--k-radius-sm);
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    box-shadow: var(--k-shadow-sm);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--k-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.k-hero-float i {
    color: var(--k-success);
}

.k-hero-float-one {
    top: 11%;
    left: 2%;
}

.k-hero-float-two {
    bottom: 12%;
    right: 0;
}

.k-landing-section {
    padding: clamp(2.5rem, 6vw, 4.5rem) 0;
    border-top: 1px solid var(--k-line);
}

.k-section-head {
    max-width: 640px;
    margin-bottom: 2rem;
}

.k-section-head h2 {
    font-size: clamp(1.5rem, 3.2vw, 2.1rem);
    margin: 0.5rem 0 0.55rem;
    letter-spacing: -0.035em;
}

.k-section-head p {
    color: var(--k-muted);
    margin: 0;
}

.k-feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.k-feature {
    padding: 1.4rem;
    border-radius: var(--k-radius);
    border: 1px solid var(--k-line);
    background: var(--k-surface);
}

.k-feature-icon {
    width: 38px;
    height: 38px;
    border-radius: 0.7rem;
    background: var(--k-accent-soft);
    color: var(--k-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.9rem;
}

.k-feature h3 {
    font-size: 0.96rem;
    margin: 0 0 0.4rem;
}

.k-feature p {
    font-size: 0.82rem;
    color: var(--k-muted);
    margin: 0;
}

.k-steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    counter-reset: step;
}

.k-step {
    position: relative;
    padding: 1.4rem;
    border-top: 1px solid var(--k-line-strong);
    counter-increment: step;
}

.k-step::before {
    content: "0" counter(step);
    display: block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--k-accent);
    margin-bottom: 0.7rem;
}

.k-step h3 {
    font-size: 0.95rem;
    margin: 0 0 0.35rem;
}

.k-step p {
    font-size: 0.82rem;
    color: var(--k-muted);
    margin: 0;
}

.k-deck-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.8rem;
}

.k-deck-preview {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    padding: 1.1rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface);
    transition: transform 150ms ease, box-shadow 150ms ease;
}

.k-deck-preview:hover {
    transform: translateY(-2px);
    box-shadow: var(--k-shadow-sm);
}

.k-deck-preview h3 {
    font-size: 0.9rem;
    margin: 0;
}

.k-deck-preview p {
    margin: 0;
    font-size: 0.72rem;
    color: var(--k-muted);
}

.k-deck-preview-meta {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    font-size: 0.68rem;
    color: var(--k-muted);
    margin-top: auto;
}

.k-landing-cta {
    margin: 0 auto 4rem;
    padding: clamp(1.8rem, 5vw, 3rem);
    border-radius: var(--k-radius-xl);
    background: linear-gradient(140deg, #2b241d 0%, #4a3127 100%);
    color: #fbf4e8;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
    position: relative;
    overflow: hidden;
}

.k-landing-cta::after {
    content: "勉強";
    position: absolute;
    right: 1rem;
    top: -1.5rem;
    font-family: var(--k-font-jp);
    font-size: 8rem;
    font-weight: 700;
    color: rgba(255, 244, 231, 0.06);
    pointer-events: none;
}

.k-landing-cta h2 {
    color: #fbf4e8;
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    margin: 0.5rem 0 0.4rem;
    position: relative;
    z-index: 1;
}

.k-landing-cta p {
    color: rgba(251, 244, 232, 0.65);
    margin: 0;
    max-width: 50ch;
    position: relative;
    z-index: 1;
}

.k-landing-cta .k-eyebrow {
    color: #d9ac88;
    position: relative;
    z-index: 1;
}

.k-landing-cta .k-btn {
    position: relative;
    z-index: 1;
}

.k-landing-cta .k-btn-primary {
    --k-btn-bg: #f6ead9;
    --k-btn-ink: #39231c;
    --k-btn-border: #f6ead9;
}

.k-article-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.k-article {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    padding: 1.2rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface);
}

.k-article h3 {
    font-size: 0.92rem;
    margin: 0;
    line-height: 1.45;
}

.k-article p {
    font-size: 0.78rem;
    color: var(--k-muted);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.k-article-link {
    margin-top: auto;
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--k-accent);
}

/* --------------------------------------------------------------------------
   Auth
   -------------------------------------------------------------------------- */

.k-auth {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(320px, 0.95fr) minmax(420px, 1.05fr);
    background: var(--k-bg);
}

.k-auth-art {
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: clamp(1.6rem, 4vw, 3rem);
    color: #fbf4e8;
    background:
        radial-gradient(circle at 15% 10%, rgba(255, 239, 219, 0.14) 0%, transparent 38%),
        linear-gradient(150deg, #432c23 0%, #231b16 58%, #161210 100%);
}

.k-auth-art::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 241, 222, 0.16) 1px, transparent 1px);
    background-size: 22px 22px;
    opacity: 0.45;
    pointer-events: none;
}

.k-auth-art::after {
    content: "日本語";
    position: absolute;
    right: -1.5rem;
    bottom: 5rem;
    font-family: var(--k-font-jp);
    font-size: clamp(5rem, 12vw, 10rem);
    font-weight: 700;
    line-height: 1;
    color: rgba(255, 244, 231, 0.055);
    writing-mode: vertical-rl;
    letter-spacing: 0.1em;
    pointer-events: none;
}

.k-auth-art > * {
    position: relative;
    z-index: 1;
}

.k-auth-art .k-brand {
    border-bottom-color: rgba(255, 244, 231, 0.16);
    padding-left: 0;
}

.k-auth-art .k-brand-name { color: #fbf4e8; }
.k-auth-art .k-brand-sub { color: rgba(251, 244, 232, 0.55); }
.k-auth-art .k-brand-jp { color: rgba(251, 244, 232, 0.4); }

.k-auth-quote {
    max-width: 430px;
    margin: auto 0;
    padding: 2rem 0;
}

.k-auth-quote .k-jp {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 500;
    line-height: 1.6;
    color: #fbf4e8;
    margin-bottom: 0.8rem;
}

.k-auth-quote p {
    color: rgba(251, 244, 232, 0.6);
    font-size: 0.84rem;
    max-width: 38ch;
}

.k-auth-foot {
    font-size: 0.7rem;
    color: rgba(251, 244, 232, 0.42);
    line-height: 1.7;
}

.k-auth-panel {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.25rem;
}

.k-auth-form {
    width: min(410px, 100%);
}

.k-auth-form h1 {
    font-size: clamp(1.5rem, 3vw, 1.9rem);
    margin: 0.4rem 0 0.35rem;
    letter-spacing: -0.04em;
}

.k-auth-form > p {
    color: var(--k-muted);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.k-auth-form form {
    display: grid;
    gap: 1rem;
}

.k-auth-switch {
    margin-top: 1.4rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--k-line);
    font-size: 0.8rem;
    color: var(--k-muted);
    text-align: center;
}

.k-auth-switch a {
    color: var(--k-accent);
    font-weight: 600;
}

.k-auth-or {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin: 0.1rem 0;
    font-size: 0.68rem;
    color: var(--k-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.k-auth-or::before,
.k-auth-or::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--k-line);
}

.k-auth-google {
    border-color: var(--k-line);
    background: var(--k-surface);
}

.k-auth-google:hover {
    border-color: var(--k-accent);
    background: var(--k-surface-2);
}

.k-auth-google img {
    width: 20px;
    height: 20px;
    flex: none;
}

.k-auth-google[aria-disabled="true"] {
    opacity: 0.72;
    cursor: not-allowed;
}

.k-auth-google[aria-disabled="true"]:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--k-line);
    background: var(--k-surface);
}

.k-auth-note {
    margin-top: 1.2rem;
    padding: 0.95rem 1rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
}

.k-auth-note strong {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.82rem;
    color: var(--k-ink);
}

.k-auth-note p {
    margin: 0;
    color: var(--k-muted);
    font-size: 0.78rem;
    line-height: 1.65;
}

.k-auth-data {
    display: grid;
    gap: 0.6rem;
    margin-top: 1.1rem;
}

.k-auth-data span {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    color: var(--k-ink-soft);
    font-size: 0.8rem;
    line-height: 1.55;
}

.k-auth-data i {
    margin-top: 0.2rem;
    color: var(--k-accent);
    flex: none;
}

.k-auth-mobile-brand {
    display: none;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.6rem;
}

.k-password-wrap {
    position: relative;
}

.k-password-wrap .k-input {
    padding-right: 2.7rem;
}

.k-password-toggle {
    position: absolute;
    right: 0.35rem;
    top: 50%;
    transform: translateY(-50%);
}

@media (max-width: 900px) {
    .k-auth {
        grid-template-columns: 1fr;
    }

    .k-auth-art {
        display: none;
    }

    .k-auth-panel {
        padding: 2rem 1.1rem;
    }

    .k-auth-mobile-brand {
        display: flex;
    }
}

/* --------------------------------------------------------------------------
   Profile
   -------------------------------------------------------------------------- */

.k-profile-head {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    padding: 1.5rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    background:
        linear-gradient(120deg, var(--k-surface) 0%, var(--k-surface-2) 100%);
    flex-wrap: wrap;
    margin-bottom: 1.4rem;
}

.k-profile-identity {
    min-width: 0;
    flex: 1;
}

.k-profile-identity h1 {
    margin: 0;
    font-size: 1.45rem;
    letter-spacing: -0.03em;
}

.k-profile-identity p {
    margin: 0.2rem 0 0;
    color: var(--k-muted);
    font-size: 0.82rem;
}

.k-profile-badges {
    display: flex;
    gap: 0.4rem;
    margin-top: 0.55rem;
    flex-wrap: wrap;
}

.k-profile-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.8rem;
    margin-bottom: 1.4rem;
}

.k-profile-tabs {
    margin-bottom: 1.2rem;
}

.k-profile-form {
    display: grid;
    gap: 1rem;
}

/* --------------------------------------------------------------------------
   Flashcard study
   -------------------------------------------------------------------------- */

.k-study {
    min-height: 100vh;
    background:
        radial-gradient(circle at 50% 0%, var(--k-surface-2) 0%, transparent 55%),
        var(--k-bg);
    display: flex;
    flex-direction: column;
}

.k-study-bar {
    position: sticky;
    top: 0;
    z-index: 60;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.7rem 1.1rem;
    background: color-mix(in srgb, var(--k-bg) 88%, transparent);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--k-line);
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
    .k-study-bar { background: var(--k-bg); }
}

.k-study-heading,
.k-study-actions {
    display: contents;
}

.k-study-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--k-muted);
    white-space: nowrap;
}

.k-study-counts {
    display: flex;
    gap: 0.55rem;
    margin-left: auto;
    font-size: 0.72rem;
    color: var(--k-muted);
    font-variant-numeric: tabular-nums;
}

.k-study-count {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
    border: 1px solid var(--k-line);
    background: var(--k-surface);
}

.k-study-count .k-dot { color: var(--k-muted); }
.k-study-count.is-new .k-dot { color: var(--k-info); }
.k-study-count.is-learning .k-dot { color: var(--k-accent); }
.k-study-count.is-review .k-dot { color: var(--k-success); }

.k-study-progress {
    padding: 0 1.1rem;
    margin-top: 0.35rem;
}

.k-study-main {
    flex: 1;
    width: 100%;
    max-width: 780px;
    margin: 0 auto;
    padding: 1.2rem 1.1rem 11rem;
    display: flex;
    flex-direction: column;
}

.k-study-card {
    position: relative;
    flex: 1;
    min-height: 330px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 3rem 1.4rem 2rem;
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    box-shadow: var(--k-shadow-sm);
    overflow: hidden;
}

.k-study-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--k-line) 1px, transparent 1px);
    background-size: 24px 24px;
    opacity: 0.35;
    pointer-events: none;
}

.k-study-card > * {
    position: relative;
    z-index: 1;
}

.k-study-badges {
    position: absolute;
    top: 0.9rem;
    left: 1rem;
    right: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    z-index: 2;
}

.k-study-badges-right {
    display: flex;
    gap: 0.4rem;
    align-items: center;
}

.k-study-prompt {
    font-family: var(--k-font-jp);
    font-weight: 600;
    font-size: clamp(2.6rem, 8vw, 4.6rem);
    line-height: 1.25;
    letter-spacing: 0.02em;
    color: var(--k-ink);
    margin: 0.6rem 0;
    word-break: break-word;
}

.k-study-prompt.is-long {
    font-size: clamp(1.9rem, 5vw, 3rem);
}

.k-study-prompt.is-very-long {
    font-size: clamp(1.4rem, 3.6vw, 2.1rem);
    line-height: 1.6;
}

.k-study-context {
    font-family: var(--k-font-jp);
    color: var(--k-muted);
    font-size: 0.9rem;
    margin-top: 0.2rem;
}

.k-study-answer {
    width: 100%;
    max-width: 560px;
    margin-top: 1.4rem;
    padding-top: 1.3rem;
    border-top: 1px dashed var(--k-line-strong);
    animation: k-fade-in 220ms ease both;
}

@keyframes k-fade-in {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.k-study-reading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    font-family: var(--k-font-jp);
    font-size: 1.25rem;
    color: var(--k-accent);
    margin-bottom: 0.8rem;
}

.k-study-meaning {
    font-size: 1.16rem;
    line-height: 1.7;
    color: var(--k-ink);
    font-weight: 500;
}

.k-study-meaning.is-reverse {
    font-family: var(--k-font-jp);
    font-size: clamp(1.8rem, 5vw, 2.6rem);
    font-weight: 600;
}

.k-study-detail {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
    margin-top: 1.1rem;
    text-align: left;
}

.k-study-detail > div {
    padding: 0.65rem 0.75rem;
    background: var(--k-surface-2);
    border-radius: var(--k-radius-sm);
}

.k-study-detail dt {
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--k-muted);
    text-transform: uppercase;
}

.k-study-detail dd {
    margin: 0.2rem 0 0;
    font-family: var(--k-font-jp);
    font-size: 0.9rem;
}

.k-study-example {
    margin-top: 0.7rem;
    padding: 0.8rem 0.9rem;
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    text-align: left;
}

.k-study-example .k-jp {
    font-size: 0.95rem;
    line-height: 1.8;
}

.k-study-example p {
    font-size: 0.78rem;
    color: var(--k-muted);
    margin: 0.3rem 0 0;
}

.k-study-audio {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid var(--k-line);
    background: var(--k-surface);
    color: var(--k-accent);
    font-size: 0.7rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.k-study-audio:hover {
    background: var(--k-accent-soft);
}

.k-study-hint {
    margin-top: 1rem;
    font-size: 0.72rem;
    color: var(--k-muted);
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex-wrap: wrap;
    justify-content: center;
}

.k-study-mode-toggle {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    margin: 0.3rem auto 0;
    padding: 0.2rem 0.35rem;
    border: 0;
    background: none;
    color: var(--k-muted);
    font-size: 0.68rem;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.k-study-mode-toggle:hover {
    color: var(--k-accent);
}

.k-study-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    padding: 0.8rem 1.1rem calc(0.9rem + env(safe-area-inset-bottom, 0px));
    background: color-mix(in srgb, var(--k-bg) 92%, transparent);
    border-top: 1px solid var(--k-line);
    backdrop-filter: blur(18px);
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
    .k-study-bottom { background: var(--k-bg); }
}

.k-study-bottom-inner {
    max-width: 780px;
    margin: 0 auto;
}

.k-rating-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.5rem;
}

.k-rating-grid.is-simple {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.k-rating {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    min-height: 64px;
    padding: 0.55rem 0.4rem;
    border-radius: var(--k-radius-sm);
    border: 1px solid var(--k-line);
    background: var(--k-surface);
    color: var(--k-ink);
    cursor: pointer;
    transition: background 140ms ease, border-color 140ms ease, transform 140ms ease;
}

.k-rating:hover {
    transform: translateY(-1px);
    border-color: var(--k-line-strong);
}

.k-rating strong {
    font-size: 0.86rem;
    font-weight: 700;
}

.k-rating small {
    font-size: 0.66rem;
    color: var(--k-muted);
    font-variant-numeric: tabular-nums;
}

.k-rating kbd {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.k-rating-again { border-color: color-mix(in srgb, var(--k-danger) 30%, var(--k-line)); }
.k-rating-again strong { color: var(--k-danger); }
.k-rating-hard { border-color: color-mix(in srgb, var(--k-gold) 30%, var(--k-line)); }
.k-rating-hard strong { color: var(--k-gold); }
.k-rating-good { border-color: color-mix(in srgb, var(--k-info) 30%, var(--k-line)); }
.k-rating-good strong { color: var(--k-info); }
.k-rating-easy { border-color: color-mix(in srgb, var(--k-success) 30%, var(--k-line)); }
.k-rating-easy strong { color: var(--k-success); }

.k-reveal {
    width: 100%;
    min-height: 54px;
    font-size: 0.95rem;
}

.k-study-finished {
    max-width: 540px;
    margin: 5vh auto;
    text-align: center;
    padding: 2.5rem 1.5rem;
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    box-shadow: var(--k-shadow-sm);
}

.k-study-finished .k-finished-mark {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--k-success-soft);
    color: var(--k-success);
    font-size: 1.6rem;
}

.k-study-pause {
    position: absolute;
    inset: 0;
    z-index: 20;
    background: color-mix(in srgb, var(--k-surface) 94%, transparent);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1.5rem;
    border-radius: inherit;
    backdrop-filter: blur(6px);
}

.k-study-pause i {
    font-size: 2.4rem;
    color: var(--k-accent);
    margin-bottom: 0.8rem;
}

.k-study-pause h3 {
    margin: 0 0 0.35rem;
}

.k-study-pause p {
    color: var(--k-muted);
    font-size: 0.82rem;
    margin-bottom: 1.2rem;
}

.k-study-empty {
    max-width: 560px;
    margin: 6vh auto;
    text-align: center;
}

/* --------------------------------------------------------------------------
   Misc / public pages / legacy tuning
   -------------------------------------------------------------------------- */

.k-search-result {
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--k-line);
}

.k-search-result:last-child { border-bottom: 0; }

.k-tag {
    display: inline-flex;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    background: var(--k-surface-2);
    color: var(--k-muted);
    font-size: 0.66rem;
    font-weight: 600;
}

.k-book-note {
    font-size: 0.74rem;
    color: var(--k-muted);
    background: var(--k-surface-2);
    border-radius: var(--k-radius-sm);
    padding: 0.7rem 0.85rem;
}

.k-note {
    padding: 0.85rem 1rem;
    border-left: 2px solid var(--k-accent);
    background: var(--k-accent-soft);
    border-radius: 0 var(--k-radius-sm) var(--k-radius-sm) 0;
    font-size: 0.82rem;
    color: var(--k-ink-soft);
}

.k-action-menu {
    position: relative;
}

.k-action-menu-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 0.35rem);
    z-index: 40;
    min-width: 160px;
    padding: 0.3rem;
    background: var(--k-surface);
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    box-shadow: var(--k-shadow-md);
}

.k-action-menu-panel a,
.k-action-menu-panel button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 0.6rem;
    border: 0;
    border-radius: 0.4rem;
    background: transparent;
    color: var(--k-ink-soft);
    font-size: 0.8rem;
    text-align: left;
    cursor: pointer;
}

.k-action-menu-panel a:hover,
.k-action-menu-panel button:hover {
    background: var(--k-surface-2);
    color: var(--k-ink);
}

.k-action-menu-panel .is-danger {
    color: var(--k-danger);
}

/* Existing forms/tables on legacy pages */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="search"],
textarea,
select {
    accent-color: var(--k-accent);
}

/* Dialog elements created with <dialog> if added later */
dialog {
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-lg);
    background: var(--k-surface);
    color: var(--k-ink);
    box-shadow: var(--k-shadow-lg);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1180px) {
    .k-hero {
        grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
        gap: 2rem;
    }

    .k-hero-art {
        min-height: 340px;
    }
}

@media (max-width: 1024px) {
    .k-sidebar {
        transform: translateX(-104%);
        transition: transform 220ms ease;
        box-shadow: var(--k-shadow-lg);
        width: min(320px, 86vw);
        z-index: 120;
    }

    .k-sidebar.is-open {
        transform: translateX(0);
    }

    .k-main {
        margin-left: 0;
        padding-bottom: 78px;
    }

    .k-admin-shell .k-main {
        padding-bottom: 0;
    }

    .k-topbar {
        padding: 0 1rem;
        background: var(--k-bg);
    }

    .k-menu-btn {
        display: inline-flex;
    }

    .k-mobile-scrim {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 110;
        background: rgba(15, 12, 9, 0.52);
        backdrop-filter: blur(3px);
    }

    .k-topbar-search {
        display: none;
    }

    .k-page {
        padding: 1.4rem 1rem 2.4rem;
    }

    .k-mobile-nav {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 100;
        display: flex;
        align-items: stretch;
        justify-content: space-around;
        gap: 0.15rem;
        padding: 0.35rem 0.4rem calc(0.35rem + env(safe-area-inset-bottom, 0px));
        background: color-mix(in srgb, var(--k-surface) 94%, transparent);
        border-top: 1px solid var(--k-line);
        backdrop-filter: blur(18px);
    }

    @supports not (background: color-mix(in srgb, red 50%, blue)) {
        .k-mobile-nav { background: var(--k-surface); }
    }

    .k-mobile-link {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.18rem;
        padding: 0.32rem 0.2rem;
        border-radius: var(--k-radius-sm);
        font-size: 0.6rem;
        font-weight: 600;
        color: var(--k-muted);
        min-width: 0;
    }

    .k-mobile-link i {
        font-size: 0.96rem;
    }

    .k-mobile-link.is-active {
        color: var(--k-accent);
        background: var(--k-accent-soft);
    }

    .k-today {
        grid-template-columns: 1fr;
    }

    .k-profile-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .k-split {
        grid-template-columns: 1fr;
    }

    .k-feature-grid,
    .k-deck-preview-grid,
    .k-article-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .k-study-bottom {
        padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
    }
}

@media (max-width: 860px) {
    .k-hero {
        grid-template-columns: 1fr;
        padding-top: 2rem;
    }

    .k-hero-art {
        order: -1;
        min-height: 300px;
    }

    .k-hero-card {
        transform: rotate(-1deg);
    }

    .k-public-links .k-public-link {
        display: none;
    }

    .k-public-bar-inner {
        padding: 0.7rem 1rem;
    }

    .k-steps,
    .k-feature-grid,
    .k-deck-preview-grid,
    .k-article-grid,
    .k-grid-3,
    .k-grid-4 {
        grid-template-columns: 1fr;
    }

    .k-grid-2 {
        grid-template-columns: 1fr;
    }

    /* The right-hand column has a 280px floor for desktop, which is wider than
       a phone once the page padding is taken out. Without this the split stays
       two columns and the cards push the page sideways. */
    .k-split {
        grid-template-columns: minmax(0, 1fr);
    }

    .k-form-grid {
        grid-template-columns: 1fr;
    }

    .k-landing-cta {
        margin-bottom: 2rem;
    }

    .k-study-main {
        padding: 0.8rem 0.7rem 12rem;
    }

    .k-study-card {
        min-height: 300px;
        padding: 2.8rem 1rem 1.6rem;
    }

    .k-rating-grid {
        gap: 0.35rem;
    }

    .k-rating {
        min-height: 58px;
        padding: 0.45rem 0.25rem;
    }

    .k-rating strong {
        font-size: 0.78rem;
    }

    .k-rating small {
        font-size: 0.6rem;
    }

    .k-study-counts {
        gap: 0.3rem;
    }

    .k-study-count {
        padding: 0.2rem 0.38rem;
        font-size: 0.66rem;
    }
}

@media (max-width: 560px) {
    .k-page-head {
        align-items: flex-start;
    }

    .k-page-head h1 {
        font-size: 1.55rem;
    }

    .k-profile-head {
        padding: 1.15rem;
        align-items: flex-start;
        gap: 0.8rem;
    }

    .k-profile-head > .k-avatar,
    .k-profile-head > .k-avatar-lg {
        width: 3.25rem;
        height: 3.25rem;
        flex: 0 0 3.25rem;
    }

    .k-profile-identity {
        flex: 1 1 calc(100% - 4.1rem);
        overflow-wrap: anywhere;
    }

    .k-profile-head > .k-stack {
        flex: 1 1 100%;
        min-width: 0 !important;
        padding-top: 0.75rem;
        border-top: 1px solid var(--k-line);
    }

    .k-profile-identity h1 {
        font-size: 1.12rem;
        overflow-wrap: anywhere;
    }

    .k-profile-identity p {
        overflow-wrap: anywhere;
    }

    .k-profile-stats .k-stat {
        min-width: 0;
        padding: 0.75rem;
    }

    .k-profile-stats .k-stat-value {
        font-size: clamp(1.05rem, 5vw, 1.4rem);
        overflow-wrap: anywhere;
    }

    .k-profile-tabs {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.25rem;
        overflow: visible;
    }

    .k-profile-tabs .k-tab {
        min-width: 0;
        padding: 0.55rem 0.3rem;
        font-size: 0.72rem;
        white-space: normal;
    }

    .k-library-book-head {
        flex-direction: column;
        gap: 0.7rem;
    }

    .k-library-book-meta {
        justify-content: flex-start !important;
        width: 100%;
    }

    .k-library-book-meta .k-btn {
        flex: 1 1 auto;
    }

    .k-library-book-head .k-book-cover {
        width: 3.2rem;
        height: 4.4rem;
        flex: 0 0 3.2rem;
    }

    .k-admin-user-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .k-admin-user-stats .k-stat-value {
        font-size: clamp(1.05rem, 5vw, 1.4rem);
        overflow-wrap: anywhere;
    }

    .k-admin-hero {
        align-items: flex-start;
        padding: 1rem;
    }

    .k-admin-hero > .k-row {
        width: 100%;
    }

    .k-admin-hero > .k-row .k-btn {
        flex: 1 1 auto;
    }

    .k-table-wrap {
        max-width: 100%;
        overflow-x: auto;
        overscroll-behavior-x: contain;
    }

    .k-profile-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .k-stat {
        padding: 0.95rem;
    }

    .k-stat-value {
        font-size: 1.45rem;
    }

    .k-book-shelf {
        grid-template-columns: 1fr;
    }

    .k-deck-grid {
        grid-template-columns: 1fr;
    }

    .k-study-bar {
        flex-wrap: wrap;
        gap: 0.3rem 0.45rem;
        padding: 0.45rem 0.65rem;
    }

    .k-study-heading {
        display: flex;
        align-items: center;
        gap: 0.4rem;
        flex: 1 1 100%;
        min-width: 0;
    }

    .k-study-heading > .k-icon-btn {
        flex: 0 0 34px;
        width: 34px;
        height: 34px;
    }

    .k-study-label {
        display: block;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        font-size: 0.78rem;
    }

    .k-study-heading > .k-badge {
        max-width: 42vw;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .k-study-counts {
        flex: 1 1 auto;
        justify-content: space-between;
        min-width: 0;
        margin-left: 0;
        gap: 0.2rem;
    }

    .k-study-count {
        gap: 0.2rem;
        padding: 0.2rem 0.32rem;
        font-size: 0.62rem;
        white-space: nowrap;
    }

    .k-study-actions {
        display: flex;
        flex: 0 1 auto;
        flex-wrap: wrap;
        align-items: center;
        justify-content: flex-end;
        gap: 0.05rem;
        max-width: 100%;
        margin-left: auto;
    }

    .k-study-actions > .k-icon-btn {
        flex: 0 0 32px;
        width: 32px;
        height: 32px;
    }

    .k-study-badges {
        top: 0.7rem;
        left: 0.75rem;
        right: 0.75rem;
    }

    .k-topbar {
        height: 58px;
    }

    .k-modal-panel {
        padding: 1.2rem;
    }

    .k-landing {
        padding: 0 1rem;
    }

    .k-hero-copy h1 {
        font-size: 2.2rem;
    }

    .k-hero-actions .k-btn {
        width: 100%;
    }

    .k-hero-proof {
        gap: 1.2rem;
    }

    .k-auth-form h1 {
        font-size: 1.55rem;
    }

    .k-study-detail {
        grid-template-columns: 1fr;
    }
}

/* --------------------------------------------------------------------------
   Feedback widget + hidden state
   -------------------------------------------------------------------------- */

[hidden],
[x-cloak] {
    display: none !important;
}

.k-study .k-feedback {
    display: none;
}

.k-feedback-fab {
    position: fixed;
    right: 1.1rem;
    bottom: 1.1rem;
    z-index: 140;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 42px;
    padding: 0.6rem 0.95rem;
    border-radius: 999px;
    border: 1px solid var(--k-line-strong);
    background: var(--k-surface);
    color: var(--k-ink-soft);
    font: inherit;
    font-size: 0.76rem;
    font-weight: 600;
    box-shadow: var(--k-shadow-sm);
    cursor: pointer;
    transition: transform 150ms ease, box-shadow 150ms ease, color 150ms ease;
}

.k-feedback-fab:hover {
    transform: translateY(-1px);
    color: var(--k-accent);
    box-shadow: var(--k-shadow-md);
}

.k-feedback-fab i {
    color: var(--k-accent);
}

#k-feedback-form {
    display: grid;
    gap: 0.9rem;
}

#k-feedback-error {
    margin: 0;
}

@media (max-width: 860px) {
    .k-feedback-fab {
        bottom: calc(76px + env(safe-area-inset-bottom, 0px));
        right: 0.9rem;
        width: 44px;
        height: 44px;
        min-height: 0;
        padding: 0;
        justify-content: center;
    }

    .k-feedback-fab span {
        display: none;
    }
}

/* --------------------------------------------------------------------------
   LLM studio
   -------------------------------------------------------------------------- */

.k-mono,
.k-code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.k-code {
    display: block;
    margin: 0;
    padding: 0.85rem 1rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    color: var(--k-ink-soft);
    font-size: 0.78rem;
    line-height: 1.65;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    max-height: 420px;
    overflow: auto;
}

.k-code-sm {
    font-size: 0.72rem;
    max-height: 220px;
}

.k-provider-card {
    display: grid;
    gap: 1rem;
}

.k-provider-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.k-provider-title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    flex-wrap: wrap;
}

.k-provider-title h2 {
    margin: 0;
    font-size: 1.02rem;
    letter-spacing: -0.02em;
}

.k-provider-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(165px, 1fr));
    gap: 0.65rem;
}

.k-provider-meta > div {
    min-width: 0;
    padding: 0.6rem 0.7rem;
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    border: 1px solid transparent;
}

.k-provider-meta span {
    display: block;
    font-size: 0.62rem;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--k-muted);
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.k-provider-meta strong,
.k-provider-meta code {
    display: block;
    font-size: 0.77rem;
    color: var(--k-ink-soft);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.k-provider-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
    border-top: 1px solid var(--k-line);
    padding-top: 0.85rem;
}

.k-secret-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--k-ink-soft);
    letter-spacing: 0.03em;
}

.k-secret-hint i {
    color: var(--k-success);
}

.k-form-section {
    display: grid;
    gap: 0.9rem;
    padding: 1.2rem 1.3rem;
}

.k-form-section + .k-form-section {
    border-top: 1px solid var(--k-line);
}

.k-form-section-head h2 {
    margin: 0.2rem 0 0;
    font-size: 1rem;
}

.k-form-section-head p {
    margin: 0.3rem 0 0;
    font-size: 0.78rem;
    color: var(--k-muted);
    max-width: 70ch;
}

.k-variable-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.8rem;
}

.k-prompt-editor {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.8rem;
    line-height: 1.65;
    min-height: 220px;
}

.k-var-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.22rem 0.5rem;
    border-radius: 0.4rem;
    background: var(--k-surface-2);
    border: 1px solid var(--k-line);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.7rem;
    color: var(--k-ink-soft);
    cursor: pointer;
}

.k-var-chip:hover {
    border-color: var(--k-accent);
    color: var(--k-accent);
}

.k-version-row {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 0.9rem;
    align-items: start;
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--k-line);
}

.k-version-row:last-child {
    border-bottom: 0;
}

.k-version-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.6rem;
    height: 2.6rem;
    border-radius: 50%;
    background: var(--k-accent-soft);
    color: var(--k-accent);
    font-weight: 800;
    font-size: 0.78rem;
}

@media (max-width: 720px) {
    .k-provider-foot {
        justify-content: flex-start;
    }

    .k-version-row {
        grid-template-columns: auto minmax(0, 1fr);
    }

    .k-version-row > :last-child {
        grid-column: 1 / -1;
    }
}

/* --------------------------------------------------------------------------
   LLM job workflow
   -------------------------------------------------------------------------- */

.k-job-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 1.2rem;
    align-items: start;
}

.k-job-aside {
    min-width: 0;
}

@media (min-width: 1025px) {
    .k-job-aside {
        position: sticky;
        top: calc(var(--k-topbar-height) + 1rem);
        max-height: calc(100vh - var(--k-topbar-height) - 2rem);
        overflow-y: auto;
        padding-bottom: 0.4rem;
    }
}

.k-mode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(205px, 1fr));
    gap: 0.6rem;
    margin-bottom: 0.9rem;
}

.k-mode-card {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.8rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface);
    cursor: pointer;
    transition: border-color 150ms ease, background 150ms ease, box-shadow 150ms ease;
}

.k-mode-card:hover {
    border-color: var(--k-line-strong);
}

.k-mode-card:focus-within {
    border-color: var(--k-accent);
    box-shadow: 0 0 0 3px var(--k-ring);
}

.k-mode-card.is-selected {
    border-color: var(--k-accent);
    background: var(--k-accent-soft);
}

.k-mode-card input {
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
    pointer-events: none;
}

.k-mode-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.1rem;
    height: 2.1rem;
    flex: 0 0 auto;
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    color: var(--k-muted);
    font-size: 0.86rem;
}

.k-mode-card.is-selected .k-mode-icon {
    background: var(--k-accent);
    color: #fff;
}

.k-mode-text {
    display: grid;
    gap: 0.15rem;
    min-width: 0;
}

.k-mode-text strong {
    font-size: 0.84rem;
    line-height: 1.3;
}

.k-mode-text span {
    font-size: 0.73rem;
    line-height: 1.45;
    color: var(--k-muted);
}

.k-job-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.55rem;
}

.k-job-meta > div {
    min-width: 0;
    padding: 0.55rem 0.65rem;
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    border: 1px solid transparent;
}

.k-job-meta span {
    display: block;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--k-muted);
    margin-bottom: 0.18rem;
}

.k-job-meta strong {
    display: block;
    font-size: 0.82rem;
    line-height: 1.3;
    overflow-wrap: anywhere;
}

.k-job-meta small {
    display: block;
    margin-top: 0.15rem;
    font-size: 0.7rem;
    color: var(--k-muted);
    overflow-wrap: anywhere;
}

/* Vocabulary audit report ------------------------------------------------ */

.k-audit-word {
    display: grid;
    gap: 0.1rem;
    min-width: 0;
}

.k-audit-word strong {
    font-size: 0.96rem;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.k-audit-meaning {
    margin: 0;
    color: var(--k-ink-soft);
    font-size: 0.82rem;
    line-height: 1.5;
    overflow-wrap: anywhere;
}

.k-audit-suggest {
    margin: 0;
    color: var(--k-ink);
    font-size: 0.84rem;
    font-weight: 600;
    line-height: 1.5;
    overflow-wrap: anywhere;
}

.k-live-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--k-success);
    box-shadow: 0 0 0 0 rgba(61, 116, 88, 0.35);
    animation: k-live-pulse 1.6s ease-out infinite;
    flex: 0 0 auto;
}

@keyframes k-live-pulse {
    0% { box-shadow: 0 0 0 0 rgba(61, 116, 88, 0.4); }
    70% { box-shadow: 0 0 0 8px rgba(61, 116, 88, 0); }
    100% { box-shadow: 0 0 0 0 rgba(61, 116, 88, 0); }
}

.k-preview-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.7rem;
    flex-wrap: wrap;
    padding: 0.65rem 0.8rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface);
}

.k-preview-card {
    display: grid;
    gap: 0.7rem;
    padding: 0.9rem;
    border: 1px solid var(--k-line);
    border-left: 3px solid transparent;
    border-radius: var(--k-radius);
    background: var(--k-surface);
    transition: border-color 150ms ease, box-shadow 150ms ease;
}

.k-preview-card:hover {
    box-shadow: var(--k-shadow-xs);
}

.k-preview-card:focus-within,
.k-preview-card.is-user-editing {
    border-color: var(--k-accent);
}

.k-preview-card[data-row-status="failed"] {
    border-left-color: var(--k-danger);
}

.k-preview-card[data-row-status="needs_edit"] {
    border-left-color: var(--k-gold);
}

.k-preview-card[data-row-status="saved"] {
    border-left-color: var(--k-success);
}

.k-preview-card[data-row-status="generating"] {
    border-left-color: var(--k-accent);
}

.k-preview-head {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.k-preview-head .k-preview-check {
    margin-top: 0.1rem;
}

.k-preview-identity {
    display: grid;
    gap: 0.12rem;
    flex: 1;
    min-width: 160px;
}

.k-preview-index {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.66rem;
    letter-spacing: 0.06em;
    color: var(--k-muted);
}

.k-preview-seed {
    font-family: var(--k-font-jp);
    font-size: 0.88rem;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.k-preview-sub {
    font-size: 0.7rem;
    color: var(--k-muted);
}

.k-preview-head > .k-badge {
    margin-left: auto;
}

.k-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(185px, 1fr));
    gap: 0.65rem;
}

.k-preview-card .k-input,
.k-preview-card .k-select {
    min-height: 38px;
    padding: 0.45rem 0.6rem;
    font-size: 0.8rem;
}

.k-preview-card .k-textarea {
    min-height: 64px;
    padding: 0.5rem 0.6rem;
    font-size: 0.8rem;
    line-height: 1.55;
}

.k-preview-card .k-label {
    font-size: 0.72rem;
    line-height: 1.35;
}

.k-preview-more,
.k-preview-source {
    border-top: 1px dashed var(--k-line);
    padding-top: 0.55rem;
}

.k-preview-more > summary,
.k-preview-source > summary {
    cursor: pointer;
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--k-muted);
    list-style: none;
}

.k-preview-more > summary::-webkit-details-marker,
.k-preview-source > summary::-webkit-details-marker {
    display: none;
}

.k-preview-more > summary::before,
.k-preview-source > summary::before {
    content: "\f078";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 0.6rem;
    margin-right: 0.4rem;
    display: inline-block;
    transition: transform 150ms ease;
}

.k-preview-more[open] > summary::before,
.k-preview-source[open] > summary::before {
    transform: rotate(180deg);
}

.k-preview-more > summary:hover,
.k-preview-source > summary:hover {
    color: var(--k-accent);
}

.k-preview-more > .k-preview-grid {
    margin-top: 0.65rem;
}

.k-preview-source > .k-code {
    margin-top: 0.5rem;
}

.k-preview-error,
.k-preview-warnings {
    display: flex;
    align-items: flex-start;
    gap: 0.45rem;
    padding: 0.5rem 0.6rem;
    border-radius: var(--k-radius-sm);
    font-size: 0.76rem;
    line-height: 1.45;
}

.k-preview-error {
    background: var(--k-danger-soft);
    color: var(--k-danger);
}

.k-preview-warnings {
    background: var(--k-gold-soft);
    color: var(--k-gold);
}

.k-preview-error i,
.k-preview-warnings i {
    margin-top: 0.15rem;
}

.k-job-save {
    border-color: var(--k-line-strong);
}

.k-step-list {
    counter-reset: k-step;
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.65rem;
}

.k-step-list li {
    position: relative;
    counter-increment: k-step;
    padding-left: 2rem;
    font-size: 0.79rem;
    line-height: 1.55;
    color: var(--k-muted);
}

.k-step-list li::before {
    content: counter(k-step);
    position: absolute;
    left: 0;
    top: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.4rem;
    height: 1.4rem;
    border-radius: 50%;
    background: var(--k-accent-soft);
    color: var(--k-accent);
    font-size: 0.68rem;
    font-weight: 800;
}

.k-step-list strong {
    color: var(--k-ink-soft);
}

.k-enrich-group {
    margin-top: 0.9rem;
    border-top: 1px solid var(--k-line);
    padding-top: 0.9rem;
}

.k-enrich-group-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.6rem;
}

.k-enrich-group-head strong {
    font-size: 0.84rem;
}

.k-enrich-fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.4rem;
}

.k-enrich-field {
    padding: 0.5rem 0.6rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    font-size: 0.79rem;
    transition: border-color 150ms ease, background 150ms ease;
}

.k-enrich-field:hover {
    border-color: var(--k-line-strong);
}

.k-enrich-field:has(input:checked) {
    border-color: var(--k-accent);
    background: var(--k-accent-soft);
}

.k-job-log {
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    padding: 0.55rem 0.7rem;
}

.k-job-log > summary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    cursor: pointer;
    list-style: none;
}

.k-job-log > summary::-webkit-details-marker {
    display: none;
}

.k-job-log-message {
    flex: 1;
    min-width: 160px;
    font-size: 0.78rem;
    color: var(--k-ink-soft);
    line-height: 1.4;
}

.k-job-log > .k-stack {
    border-top: 1px dashed var(--k-line);
    padding-top: 0.6rem;
}

@media (max-width: 1024px) {
    .k-job-layout {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 720px) {
    .k-preview-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .k-mode-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .k-preview-head > .k-badge {
        margin-left: 0;
    }

    .k-enrich-fields {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ==========================================================================
   Audio player (KitsukuAudio)
   Used by cards, review screens, and the exam editor. Replaces native
   <audio controls> so failures are visible instead of silent.
   ========================================================================== */

.k-audio-player {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    width: 100%;
    max-width: 27rem;
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface-2);
    box-shadow: var(--k-shadow-xs);
}

.k-audio-player__toggle {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.4rem;
    height: 2.4rem;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: var(--k-accent);
    color: #fff;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.18s ease, transform 0.18s ease;
}

.k-audio-player__toggle:hover {
    background: var(--k-accent-hover);
}

.k-audio-player__toggle:active {
    transform: scale(0.96);
}

.k-audio-player__toggle:focus-visible {
    outline: 2px solid var(--k-ring);
    outline-offset: 3px;
}

.k-audio-player__toggle:disabled {
    opacity: 0.6;
    cursor: progress;
}

.k-audio-player__body {
    flex: 1 1 auto;
    min-width: 0;
}

.k-audio-player__top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.6rem;
}

.k-audio-player__label {
    min-width: 0;
    overflow: hidden;
    color: var(--k-ink-soft);
    font-size: 0.78rem;
    font-weight: 600;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.k-audio-player__time {
    flex: 0 0 auto;
    color: var(--k-muted);
    font-size: 0.68rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.01em;
}

.k-audio-player__seek {
    display: block;
    width: 100%;
    height: 1.25rem;
    margin: 0.1rem 0 0;
    padding: 0;
    accent-color: var(--k-accent);
    background: transparent;
    cursor: pointer;
}

.k-audio-player__status {
    margin: 0.2rem 0 0;
    color: var(--k-muted);
    font-size: 0.7rem;
    line-height: 1.35;
}

.k-audio-player__status.is-error,
.k-audio-player.has-error .k-audio-player__status {
    color: var(--k-danger);
}

.k-audio-player__audio {
    display: none;
}

.k-audio-native {
    display: block;
    width: 100%;
    max-width: 32rem;
    height: 40px;
}

.k-audio-exam + .k-audio-status,
.k-audio-status {
    margin: 0.3rem 0 0;
    color: var(--k-danger);
    font-size: 0.78rem;
    line-height: 1.4;
}

html[data-theme="dark"] .k-audio-player__toggle {
    color: #1c1a17;
}

/* --------------------------------------------------------------------------
   Phase 4 · Curriculum, quality review, media library, TTS
   -------------------------------------------------------------------------- */

.k-text-success { color: var(--k-success) !important; }
.k-text-danger { color: var(--k-danger) !important; }

.k-curriculum-flow {
    display: grid;
    gap: 0.85rem;
}

.k-curriculum-step {
    display: grid;
    grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.75fr);
    gap: 1.5rem;
    align-items: start;
    min-width: 0;
    padding: 1.25rem 1.4rem 1.3rem;
}

.k-curriculum-step-intro {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    min-width: 0;
}

.k-curriculum-step-intro > div {
    min-width: 0;
}

.k-curriculum-step-no {
    display: inline-grid;
    place-items: center;
    flex: none;
    width: 2.1rem;
    height: 2.1rem;
    border: 1px solid var(--k-line-strong);
    border-radius: 999px;
    background: var(--k-accent-soft);
    color: var(--k-accent);
    font-family: var(--k-font-serif);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.k-curriculum-step-intro h2 {
    margin: 0.2rem 0 0.3rem;
    font-size: 1.05rem;
}

.k-curriculum-step-intro p {
    margin: 0;
    max-width: 46ch;
    color: var(--k-muted);
    font-size: 0.78rem;
    line-height: 1.55;
}

.k-curriculum-step-form {
    display: grid;
    gap: 0.7rem;
    align-content: start;
    min-width: 0;
}

.k-curriculum-actions {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex-wrap: wrap;
}

.k-curriculum-note {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--k-muted);
    font-size: 0.72rem;
    line-height: 1.4;
}

.k-curriculum-note i {
    color: var(--k-line-strong);
    font-size: 0.68rem;
}

.k-report-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.k-report-facts {
    display: grid;
    gap: 0;
    margin: 0;
}

.k-report-facts > div {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.8rem;
    padding: 0.45rem 0;
    border-bottom: 1px dashed var(--k-line);
}

.k-report-facts > div:last-child {
    border-bottom: 0;
}

.k-report-facts dt {
    color: var(--k-muted);
    font-size: 0.76rem;
    margin: 0;
}

.k-report-facts dd {
    margin: 0;
    text-align: right;
    font-weight: 700;
    font-size: 0.84rem;
    overflow-wrap: anywhere;
}

.k-recommendation-list {
    display: grid;
    gap: 0.55rem;
}

.k-recommendation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.9rem;
    padding: 0.7rem 0.8rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
}

.k-recommendation > :first-child {
    min-width: 0;
}

.k-kanji-sample {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}

.k-kanji-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.3rem;
    height: 2.3rem;
    padding: 0 0.4rem;
    border-radius: var(--k-radius-sm);
    border: 1px solid var(--k-line);
    background: var(--k-surface-2);
    font-family: var(--k-font-jp);
    font-size: 1.15rem;
    color: var(--k-ink);
}

.k-outline-list {
    display: grid;
    gap: 0.2rem;
    margin-top: 0.8rem;
}

.k-outline-item {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.85rem;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--k-line);
}

.k-outline-item:last-child {
    border-bottom: 0;
    padding-bottom: 0;
}

.k-outline-index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--k-accent-soft);
    color: var(--k-accent);
    font-family: var(--k-font-serif);
    font-weight: 700;
    font-size: 0.85rem;
}

.k-report-notes {
    margin: 0;
    padding-left: 1.1rem;
    display: grid;
    gap: 0.35rem;
    color: var(--k-muted);
    font-size: 0.8rem;
    line-height: 1.55;
}

.k-organize-list {
    display: grid;
    gap: 0.5rem;
}

.k-organize-group {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    gap: 0.65rem;
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    cursor: pointer;
    transition: border-color 150ms ease, background 150ms ease, box-shadow 150ms ease;
}

.k-organize-group:hover {
    border-color: var(--k-line-strong);
}

.k-organize-group:has(input:checked) {
    border-color: var(--k-accent);
    background: var(--k-accent-soft);
    box-shadow: 0 0 0 3px var(--k-ring);
}

.k-organize-group.is-static {
    cursor: default;
    opacity: 0.82;
}

.k-organize-check {
    width: 1.05rem;
    height: 1.05rem;
    margin: 0.15rem 0 0;
    accent-color: var(--k-accent);
    flex: 0 0 auto;
}

.k-organize-group > .k-organize-check:not(input) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--k-muted);
    font-size: 0.72rem;
}

.k-organize-labels {
    display: block;
    margin-top: 0.3rem;
    color: var(--k-ink-soft);
    font-size: 0.75rem;
    line-height: 1.5;
    overflow-wrap: anywhere;
}

.k-organize-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 0.85rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--k-line);
}

.k-check-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.78rem;
    color: var(--k-muted);
    cursor: pointer;
}

.k-check-inline input {
    width: 1rem;
    height: 1rem;
    accent-color: var(--k-accent);
}

.k-inline-id {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    color: var(--k-muted);
    font-size: 0.72rem;
}

/* Quality review queue ------------------------------------------------ */

.k-quality-toolbar {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 0.9rem;
}

.k-quality-filters {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.45rem;
    flex: 1 1 420px;
    min-width: 0;
}

.k-quality-filters .k-select {
    flex: 0 1 auto;
    width: auto;
    min-width: 130px;
    max-width: 220px;
}

.k-quality-scan {
    flex: 0 0 auto;
}

.k-quality-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 1.2rem;
    align-items: start;
}

.k-bulk-bar {
    position: sticky;
    top: calc(var(--k-topbar-height) + 0.4rem);
    z-index: 6;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: color-mix(in srgb, var(--k-surface) 92%, transparent);
    box-shadow: var(--k-shadow-xs);
    backdrop-filter: blur(8px);
}

.k-bulk-bar .k-select {
    width: auto;
    min-width: 150px;
}

.k-quality-card {
    display: grid;
    gap: 0.6rem;
    padding: 0.85rem 0.95rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface);
}

.k-quality-head {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.k-quality-check {
    width: 1.05rem;
    height: 1.05rem;
    accent-color: var(--k-accent);
    flex: 0 0 auto;
}

.k-quality-identity {
    flex: 1 1 240px;
    min-width: 0;
}

.k-quality-identity strong {
    overflow-wrap: anywhere;
}

.k-quality-score {
    margin-left: auto;
    font-weight: 800;
    color: var(--k-accent);
    font-size: 0.95rem;
}

.k-quality-score span {
    margin-left: 0.1rem;
    color: var(--k-muted);
    font-size: 0.68rem;
    font-weight: 500;
}

.k-quality-issues {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.3rem;
}

.k-issue {
    display: flex;
    align-items: flex-start;
    gap: 0.45rem;
    padding: 0.42rem 0.55rem;
    border: 1px solid transparent;
    border-radius: 0.4rem;
    font-size: 0.76rem;
    line-height: 1.5;
}

.k-issue i {
    margin-top: 0.18rem;
}

.k-issue-error {
    background: var(--k-danger-soft);
    border-color: color-mix(in srgb, var(--k-danger) 20%, transparent);
    color: var(--k-danger);
}

.k-issue-warning {
    background: var(--k-gold-soft);
    border-color: color-mix(in srgb, var(--k-gold) 22%, transparent);
    color: var(--k-gold);
}

.k-issue-info {
    background: var(--k-info-soft);
    border-color: color-mix(in srgb, var(--k-info) 20%, transparent);
    color: var(--k-info);
}

.k-quality-edit {
    display: grid;
    gap: 0.5rem;
}

.k-quality-edit .k-textarea {
    font-size: 0.74rem;
    line-height: 1.55;
}

.k-quality-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

/* Media library ------------------------------------------------------- */

.k-badge-soft {
    background: var(--k-surface-2);
    color: var(--k-muted);
    border: 1px solid var(--k-line);
}

.k-media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(235px, 1fr));
    gap: 0.85rem;
}

.k-media-card {
    display: flex;
    flex-direction: column;
    min-width: 0;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius);
    background: var(--k-surface);
    overflow: hidden;
    transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

.k-media-card:hover {
    border-color: var(--k-line-strong);
    box-shadow: var(--k-shadow-sm);
    transform: translateY(-1px);
}

.k-media-preview {
    display: grid;
    place-items: center;
    gap: 0.45rem;
    min-height: 120px;
    padding: 0.8rem;
    border-bottom: 1px solid var(--k-line);
    background: var(--k-surface-2);
}

.k-media-preview img {
    display: block;
    max-width: 100%;
    max-height: 150px;
    width: auto;
    height: auto;
    object-fit: contain;
}

.k-media-preview .k-audio-player {
    width: 100%;
}

.k-media-glyph {
    font-size: 2rem;
    color: var(--k-muted);
}

.k-media-meta {
    display: grid;
    gap: 0.3rem;
    padding: 0.7rem 0.8rem;
    min-width: 0;
}

.k-media-title {
    font-size: 0.84rem;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.k-media-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: auto;
    padding: 0 0.8rem 0.75rem;
}

.k-media-actions form {
    margin: 0;
}

.k-media-attach {
    border-top: 1px solid var(--k-line);
    padding: 0.5rem 0.8rem 0.7rem;
}

.k-media-attach summary {
    cursor: pointer;
    font-size: 0.74rem;
    color: var(--k-muted);
}

.k-media-attach summary:hover {
    color: var(--k-accent);
}

.k-media-attach form {
    margin-top: 0.5rem;
}

.k-radio-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 0.55rem;
}

.k-radio-card {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    padding: 0.7rem 0.75rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface);
    cursor: pointer;
    transition: border-color 150ms ease, background 150ms ease, box-shadow 150ms ease;
}

.k-radio-card:hover {
    border-color: var(--k-line-strong);
}

.k-radio-card:has(input:checked),
.k-radio-card.is-selected {
    border-color: var(--k-accent);
    background: var(--k-accent-soft);
    box-shadow: 0 0 0 3px var(--k-ring);
}

.k-radio-card input {
    width: 1rem;
    height: 1rem;
    margin-top: 0.1rem;
    accent-color: var(--k-accent);
    flex: 0 0 auto;
}

.k-radio-card > span {
    display: grid;
    gap: 0.15rem;
    min-width: 0;
}

.k-radio-card strong {
    font-size: 0.82rem;
}

/* TTS job items ------------------------------------------------------- */

.k-tts-item {
    display: grid;
    gap: 0.45rem;
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface);
}

.k-tts-item-head {
    display: flex;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.k-tts-item-title {
    flex: 1 1 260px;
    display: grid;
    gap: 0.1rem;
    min-width: 0;
}

.k-tts-item-title strong {
    font-size: 0.84rem;
    overflow-wrap: anywhere;
}

.k-tts-item-title .k-micro {
    overflow-wrap: anywhere;
}

.k-tts-item-audio {
    min-height: 1.4rem;
    max-width: 34rem;
}

@media (max-width: 1100px) {
    .k-quality-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .k-quality-layout .k-job-aside {
        position: static;
        max-height: none;
        overflow: visible;
    }
}

@media (max-width: 900px) {
    .k-report-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 720px) {
    .k-recommendation {
        align-items: flex-start;
        flex-direction: column;
    }

    .k-outline-item {
        grid-template-columns: auto minmax(0, 1fr);
    }

    .k-outline-item > :last-child {
        grid-column: 1 / -1;
        justify-self: stretch;
        justify-content: center;
    }

    .k-quality-filters .k-select {
        flex: 1 1 140px;
        max-width: none;
    }

    .k-bulk-bar {
        position: static;
    }

    .k-media-grid {
        grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    }

    .k-organize-footer {
        align-items: flex-start;
        flex-direction: column;
    }
}

/* --------------------------------------------------------------------------
   Admin article management
   -------------------------------------------------------------------------- */

.k-article-list {
    min-width: 0;
}

.k-article-admin-row {
    transition: border-color 180ms ease;
}

.k-article-admin-row:hover {
    border-color: var(--k-line-strong);
}

.k-article-admin-row h2 {
    overflow-wrap: anywhere;
}

.k-article-admin-meta {
    margin: 0.45rem 0 0;
    color: var(--k-muted);
    font-size: 0.7rem;
    line-height: 1.45;
    letter-spacing: 0;
    text-transform: none;
    overflow-wrap: anywhere;
}

.k-article-admin-thumb {
    flex: 0 0 auto;
    width: 64px;
    height: 64px;
    border: 1px solid var(--k-line);
    border-radius: var(--k-radius-sm);
    background: var(--k-surface-2);
    object-fit: cover;
}

.k-article-admin-thumb.is-empty {
    display: grid;
    place-items: center;
    color: var(--k-line-strong);
    font-size: 1.1rem;
}

.k-article-edit {
    margin-top: 0.9rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--k-line);
}

@media (max-width: 900px) {
    .k-curriculum-step {
        grid-template-columns: minmax(0, 1fr);
        gap: 0.9rem;
    }
}

@media (max-width: 560px) {
    .k-curriculum-step {
        padding: 1rem;
    }

    .k-curriculum-actions .k-btn {
        width: 100%;
        justify-content: center;
    }

    .k-article-admin-thumb {
        width: 52px;
        height: 52px;
    }
}