@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Toddle-inspired palette */
    --primary: #8366e8;
    --primary-light: #9d84ff;
    --primary-dark: #6b52cc;

    /* Semantic status colors — the only colors besides --primary and neutrals.
       Values match what was already the de-facto standard across pill/badge
       usage sitewide; formalized here so nothing invents a new hue for the
       same meaning. */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    /* The accent at low opacity — the standard fill for a hovered or selected
       control that should read as "touched by the accent" without becoming a
       filled primary button. It was already being used as var(--tint) in
       book_page.html, learn.html and book_learn.html (11 places) but had never
       been defined anywhere, so every one of those resolved to nothing and the
       states they styled silently had no fill at all. Derived from --primary so
       it follows the accent into dark theme without a second declaration. */
    --tint: color-mix(in srgb, var(--primary) 12%, transparent);

    /* Neutral hover fill for rows and icon buttons that should lift off the
       surface without taking the accent. book_page.html had this as a literal
       #F0F4F8 in light and #1d1f28 in dark, repeated across the nav rows and
       both sidebar toggles, with a dark override per site to undo the light
       value. One token, and those overrides stop being needed. */
    --surface-hover: #f0f4f8;

    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --text-dark: #1a1a1a;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
    --radius-sm: 8px;
    /* Control tier. 6px was already the de-facto radius on every button and
       input in the app but was hardcoded at each site, so the "controls are
       6px, containers are 8-12px" split had no token backing it. */
    --radius-control: 6px;

    /* Shared page header (reading page + editor) */
    --header-bg: var(--primary);
    --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
    color-scheme: light;
}

[data-theme="dark"] {
    /* 2026 dark: deep violet-tinted layered surfaces, brightened accent */
    --primary: #9d84ff;
    --primary-light: #b5a3ff;
    --primary-dark: #8366e8;
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --info: #60a5fa;
    --surface-hover: #1d1f28;
    --bg-light: #0f1014;
    --bg-white: #17181f;
    --text-dark: #ececf1;
    --text-light: #9a9aa8;
    --border: #262833;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 40px -8px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(157, 132, 255, 0.06);
    --header-bg: #17181f;
    color-scheme: dark;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

button, input, select, textarea {
    font-family: inherit;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================ */
/* TODDLE-INSPIRED NAVIGATION BAR             */
/* ============================================ */

.app-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-white);
    padding: 0.875rem 2rem;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    gap: 1.5rem;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
    letter-spacing: -0.5px;
}

.nav-brand-icon {
    width: 28px;
    height: 28px;
    stroke: var(--primary);
    stroke-width: 2;
    fill: none;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex: 0 1 auto;
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: color 0.2s ease, background 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
    position: relative;
}

.nav-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke-width: 2;
    fill: none;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(131, 102, 232, 0.08);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(131, 102, 232, 0.12);
    font-weight: 600;
}

.global-search-wrapper {
    position: relative;
    flex: 0 1 340px;
    margin: 0 0.5rem;
}

.global-search-input {
    width: 100%;
    padding: 0.5rem 1rem 0.5rem 2.4rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-light);
    color: var(--text-dark);
    font-size: 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.global-search-input::placeholder {
    color: var(--text-light);
    font-size: 0.85rem;
}

.global-search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(131, 102, 232, 0.1);
    background: var(--bg-white);
}

.search-icon {
    position: absolute;
    left: 0.65rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    pointer-events: none;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.search-results-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-top: 0.5rem;
    max-height: 400px;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
}

.search-results-dropdown.active {
    display: block;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 0.8rem;
    background: rgba(131, 102, 232, 0.08);
    border-radius: 6px;
    border: 1px solid rgba(131, 102, 232, 0.15);
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8366e8 0%, #6b52cc 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    flex-shrink: 0;
}

.user-name {
    font-size: 0.9rem;
    color: var(--text-dark);
    font-weight: 500;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--border);
    cursor: pointer;
    padding: 0.5rem 0.65rem;
    border-radius: 6px;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dark);
    position: relative;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.theme-icon-light,
.theme-icon-dark {
    width: 18px;
    height: 18px;
    position: absolute;
    transition: opacity 0.3s ease;
    fill: currentColor;
}

.theme-icon-light {
    opacity: 1;
}

.theme-icon-dark {
    opacity: 0;
}

[data-theme="dark"] .theme-icon-light {
    opacity: 0;
}

[data-theme="dark"] .theme-icon-dark {
    opacity: 1;
}

.theme-toggle-btn:hover {
    background: rgba(131, 102, 232, 0.12);
    border-color: var(--primary);
    color: var(--primary);
}

.logout-btn {
    background: transparent;
    border: 1px solid var(--border);
    cursor: pointer;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    text-decoration: none;
    color: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 500;
    flex-shrink: 0;
    white-space: nowrap;
}

.logout-btn .nav-icon {
    width: 16px;
    height: 16px;
}

.logout-btn:hover {
    background: rgba(131, 102, 232, 0.12);
    border-color: var(--primary);
    color: var(--primary);
}

/* Header */
header {
    background: var(--bg-white);
    color: var(--text-dark);
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.25rem;
    color: var(--primary);
}

header p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Main Grid */
.main-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1rem;
    padding: 1rem;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--bg-light);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: #999;
}

/* Panels */
.panel {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.panel h2 {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 1rem;
    color: var(--text-light);
}

/* Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

input[type="url"],
input[type="text"],
input[type="search"] {
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--bg-light);
    color: var(--text-dark);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

input[type="url"]:focus,
input[type="text"]:focus,
input[type="search"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(131, 102, 232, 0.1);
    background: var(--bg-white);
}

/* Buttons */
.btn {
    padding: 0.65rem 1rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
    box-shadow: 0 2px 8px rgba(131, 102, 232, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, #8366e8 0%, #6b52cc 100%);
    color: white;
    width: 100%;
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #9d84ff 0%, #7b66ff 100%);
    box-shadow: 0 4px 12px rgba(131, 102, 232, 0.4);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(131, 102, 232, 0.3);
}

.btn-secondary {
    background: linear-gradient(135deg, #82d782 0%, #5ba35a 100%);
    color: white;
    width: 100%;
    border: none;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #a0e8a0 0%, #6bb36b 100%);
    box-shadow: 0 4px 12px rgba(130, 215, 130, 0.4);
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    width: auto;
}

/* Admin Base Styles */
.admin-shell { display: flex; min-height: 100vh; }

.admin-sidebar {
    width: 240px;
    background: var(--bg-white);
    border-right: 1px solid var(--border);
    padding: 1rem 0.5rem;
    flex-shrink: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
    position: relative;
}

.admin-sidebar.collapsed {
    width: 80px;
}


/* Navigation Sections */
.nav-section {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 1.5rem;
}

.nav-section h2 {
    font-size: 0.75rem;
    margin: 0 0 0.75rem 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-light);
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    transition: all 0.3s ease;
}

.admin-sidebar.collapsed .nav-section h2 {
    display: none;
}

/* Navigation Items */
.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0.8rem;
    border-radius: 6px;
    color: var(--text-dark);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.2s ease, color 0.2s ease;
    white-space: nowrap;
    position: relative;
}

.nav-item:hover {
    background: rgba(131, 102, 232, 0.12);
    color: var(--primary);
}

.nav-item:active {
    background: rgba(131, 102, 232, 0.2);
    color: var(--primary);
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    stroke-width: 2;
}

.nav-label {
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity 0.3s ease;
}

/* Collapsed State */
.admin-sidebar.collapsed .nav-label {
    display: none;
}

.admin-sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 0.75rem;
    overflow: visible;
}

/* Tooltip on hover when collapsed */
.admin-sidebar.collapsed .nav-item::after {
    content: attr(data-tooltip);
    position: absolute;
    left: calc(100% + 0.75rem);
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary);
    color: white;
    border-radius: 6px;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    z-index: 1000;
    box-shadow: 0 8px 24px rgba(131, 102, 232, 0.25);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    transform: translateY(-50%) scale(0.95);
}

.admin-sidebar.collapsed .nav-item:hover::after {
    opacity: 1;
    transform: translateY(-50%) scale(1);
}

/* Bottom Section */
.nav-section-bottom {
    margin-top: auto;
    margin-bottom: 1rem;
}

/* User Section */
.user-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 0.8rem;
    margin-top: auto;
    border-top: 1px solid var(--border);
    transition: all 0.3s ease;
}

.user-avatar-large {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8366e8 0%, #6b52cc 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    font-weight: 700;
    flex-shrink: 0;
}

.user-details {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    min-width: 0;
    transition: opacity 0.3s ease;
}

.user-name-full {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-dark);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-email {
    font-size: 0.75rem;
    color: var(--text-light);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Collapsed state - hide user details, center avatar */
.admin-sidebar.collapsed .user-section {
    justify-content: center;
    padding: 0.75rem 0.8rem;
}

.admin-sidebar.collapsed .user-details {
    display: none;
}

.admin-sidebar.collapsed .user-avatar-large {
    width: 40px;
    height: 40px;
    min-width: 40px;
    font-size: 1rem;
}
/* No overflow here on purpose: the sidebar is position:fixed and independent
   (see _sidebar.html), so this doesn't need its own scroll container — and
   overflow:auto/hidden/scroll on an ancestor silently breaks position:sticky
   for anything inside it (it becomes the sticky containing block instead of
   the viewport). Previously worked around for a fixed-position modal by
   re-parenting it to <body> — see admin_view_as_student.html. */
.admin-main { flex: 1; padding: 2rem; max-width: 1300px; }
.admin-flash-success {
    background: rgba(130, 215, 130, 0.1);
    color: #5dd19e;
    padding: 0.8rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    border-left: 4px solid #82d782;
}
.admin-flash-error {
    background: rgba(253, 114, 125, 0.1);
    color: #ff6b6b;
    padding: 0.8rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    border-left: 4px solid #fd727d;
}
table.admin-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}
table.admin-table th, table.admin-table td {
    text-align: left;
    padding: 0.75rem 0.9rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}
table.admin-table th {
    background: var(--bg-light);
    font-weight: 600;
    color: var(--text-dark);
}
table.admin-table tr:hover {
    background: rgba(131, 102, 232, 0.05);
}
.admin-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
/* Sub-nav tabs: for pages that share one sidebar entry (e.g. Flashcards / Vocabulary) */
.subnav-tabs {
    display: flex;
    gap: 0.4rem;
    margin: -0.5rem 0 1.5rem;
    border-bottom: 1px solid var(--border);
}
.subnav-tab {
    padding: 0.6rem 0.9rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-light);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s ease, border-color 0.15s ease;
}
.subnav-tab:hover { color: var(--text-dark); }
.subnav-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
/* Button hierarchy: primary (solid) > ghost (outline, navigational) > text (reversible/low-stakes).
   Only one tier per row should be "loud" — see .admin-btn-ghost / .admin-btn-text below. */
.admin-btn {
    display: inline-block;
    padding: 0.55rem 1.1rem;
    border: none;
    border-radius: 6px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85rem;
    text-decoration: none;
    transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.admin-btn:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(131, 102, 232, 0.3);
    transform: translateY(-2px);
}
.admin-btn-danger {
    background: var(--danger);
}
.admin-btn-danger:hover {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* Secondary tier: navigational actions (Manage, View, tab-like switches) — not committal,
   shouldn't compete with the row's one primary action. */
.admin-btn-ghost {
    display: inline-block;
    padding: 0.54rem 1.1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--text-dark);
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85rem;
    text-decoration: none;
    transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.admin-btn-ghost:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(131, 102, 232, 0.06);
}
.admin-btn-ghost.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.admin-btn-ghost.active:hover {
    background: var(--primary-dark);
    color: #fff;
}

/* Tertiary tier: reversible / low-stakes actions (Archive) — a plain link, not a button
   pretending to be as significant as Delete. */
.admin-btn-text {
    display: inline-block;
    padding: 0.4rem 0.7rem;
    /* Muted grey text on a bare background read as disabled sitting next to the
       filled and bordered tiers — the exact failure DESIGN.md's third Don't
       names. Full-strength ink keeps it legible as a control; the tier reads as
       quiet because it has no fill and no border at rest, not because it is faint. */
    border: none;
    background: none;
    color: var(--text-dark);
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85rem;
    border-radius: var(--radius-control);
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease;
}
.admin-btn-text:hover {
    color: var(--primary);
    background: var(--tint);
}
.admin-inline-form { display: flex; gap: 0.5rem; }
.admin-inline-form input {
    padding: 0.5rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-light);
    color: var(--text-dark);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.admin-inline-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(131, 102, 232, 0.1);
}

/* Status Messages */
.status-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    display: none;
    font-size: 0.9rem;
    border-left: 4px solid var(--primary);
    background: rgba(131, 102, 232, 0.1);
    color: var(--text-light);
}

.status-message.show {
    display: block;
}

.status-message.success {
    background: rgba(130, 215, 130, 0.1);
    color: #5dd19e;
    border-left-color: #82d782;
}

.status-message.error {
    background: rgba(253, 114, 125, 0.1);
    color: #ff6b6b;
    border-left-color: #fd727d;
}

.status-message.loading {
    background: rgba(131, 102, 232, 0.1);
    color: #9d84ff;
    border-left-color: #8366e8;
}

/* Content List */
.content-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 400px;
    overflow-y: auto;
}

.content-item {
    padding: 0.85rem 1rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.content-item:hover {
    background-color: rgba(131, 102, 232, 0.1);
    border-color: var(--primary);
    color: var(--primary);
}

.content-item.active {
    background-color: rgba(131, 102, 232, 0.15);
    border-color: var(--primary);
    box-shadow: inset 0 0 0 1px var(--primary);
    color: var(--primary);
}

.content-item h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    color: var(--text-dark);
}

.content-item p {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Content Area */
.content-area {
    background: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
}

.content-panel {
    overflow-y: auto;
    padding: 2rem;
    flex: 1;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-light);
}

.placeholder h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* Content Display */
.content-display {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-header {
    border-bottom: 2px solid var(--primary);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.content-header h2 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.content-meta {
    font-size: 0.9rem;
    color: var(--text-light);
}

.content-meta span {
    display: inline-block;
    margin-right: 1.5rem;
}

/* Sections */
.section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-white);
    border-radius: 8px;
    border-left: 4px solid var(--primary);
    box-shadow: 0 2px 8px rgba(131, 102, 232, 0.08);
}

.section h3 {
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.section h4 {
    color: var(--text-dark);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
}

.section p {
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 0.75rem;
}

.section ul, .section ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.section li {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

/* Dashboard specific styles */
.dashboard-body {
    background: var(--bg-light);
    color: var(--text-dark);
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.dashboard-header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 2rem;
    background: var(--bg-white);
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.dashboard-header h1 {
    font-size: 2rem;
    margin: 0 0 0.5rem 0;
    color: var(--primary);
}

.dashboard-header p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin: 0;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 320px;
    max-width: 500px;
    pointer-events: auto;
    animation: slideIn 250ms var(--ease-out);
}

@keyframes slideIn {
    from {
        transform: translateX(120%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.removing {
    animation: slideOut 200ms var(--ease-out) forwards;
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(120%);
        opacity: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .toast { animation: toast-fade-in 200ms ease; }
    .toast.removing { animation: toast-fade-out 200ms ease forwards; }
    @keyframes toast-fade-in { from { opacity: 0; } to { opacity: 1; } }
    @keyframes toast-fade-out { from { opacity: 1; } to { opacity: 0; } }
}

.toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.toast-message {
    font-size: 0.9rem;
    color: var(--text-light);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    flex-shrink: 0;
    transition: color 0.2s ease, transform 0.12s ease-out;
}

.toast-close:hover {
    color: var(--text-dark);
}

.toast-close:active {
    transform: scale(0.9);
}

@media (prefers-reduced-motion: reduce) {
    .toast-close { transition: color 0.2s ease; }
    .toast-close:active { transform: none; }
}

.toast.success {
    border-left: 4px solid #82d782;
}

.toast.error {
    border-left: 4px solid #fd727d;
}

.toast.warning {
    border-left: 4px solid #ffd666;
}

.toast.info {
    border-left: 4px solid var(--primary);
}

/* Responsive */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 280px 1fr;
    }

    .app-nav {
        gap: 1rem;
        padding: 0.75rem 1.5rem;
    }

    .nav-links {
        gap: 0.25rem;
    }

    .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .global-search-wrapper {
        max-width: 280px;
    }

    .user-name {
        display: none;
    }
}

@media (max-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .app-nav {
        flex-wrap: wrap;
        gap: 0.75rem;
        padding: 0.75rem 1rem;
        justify-content: flex-start;
    }

    .nav-brand {
        flex: 0 0 100%;
        margin-bottom: 0.25rem;
    }

    .nav-links {
        order: 2;
        width: 100%;
        gap: 0.35rem;
        flex-wrap: wrap;
    }

    .nav-link {
        flex: 1 1 auto;
        min-width: 90px;
        padding: 0.45rem 0.6rem;
        font-size: 0.8rem;
    }

    .global-search-wrapper {
        order: 1;
        flex: 0 1 100%;
        max-width: 100%;
        margin: 0 0 0.5rem 0;
    }

    .nav-right {
        flex: 0 0 100%;
        gap: 0.5rem;
        justify-content: flex-end;
    }

    .user-info {
        display: none;
    }

    .logout-btn {
        padding: 0.45rem 0.6rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 600px) {
    .content-panel {
        padding: 0.75rem;
    }

    .section {
        padding: 1rem;
    }
}

/* Scrollbar Styling */
.content-panel::-webkit-scrollbar,
.component-sidebar::-webkit-scrollbar,
.component-sidebar *::-webkit-scrollbar {
    width: 8px;
}

.content-panel::-webkit-scrollbar-track,
.component-sidebar::-webkit-scrollbar-track {
    background: var(--bg-light);
}

.content-panel::-webkit-scrollbar-thumb,
.component-sidebar::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.content-panel::-webkit-scrollbar-thumb:hover,
.component-sidebar::-webkit-scrollbar-thumb:hover {
    background: #999;
}

.content-list::-webkit-scrollbar,
.search-results::-webkit-scrollbar {
    width: 6px;
}

.content-list::-webkit-scrollbar-thumb,
.search-results::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

/* ============================================
   Admin page headers + stat strip
   ============================================ */
.admin-page-header {
    margin-bottom: 1.5rem;
}

.admin-page-header h1 {
    margin: 0 0 0.25rem;
    font-size: 1.6rem;
}

.admin-page-header .page-description {
    margin: 0;
    color: var(--text-light);
    font-size: 0.95rem;
}

.stat-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin: 1.25rem 0 1.75rem;
}

.stat-tile {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1rem 1.25rem;
}

.stat-tile .stat-tile-value {
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.2;
}

.stat-tile .stat-tile-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-light);
    margin-top: 0.25rem;
}

/* ============================================
   Analytics data cards (tables)
   ============================================ */
.analytics-table-wrap {
    overflow: auto;
    max-height: 75vh;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: var(--bg-white);
}

table.analytics-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.9rem;
}

.analytics-table th,
.analytics-table td {
    text-align: left;
    padding: 0.75rem 0.9rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg-white);
}

.analytics-table thead th {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--bg-light);
    font-weight: 600;
    color: var(--text-dark);
    white-space: nowrap;
}

.analytics-table th:first-child,
.analytics-table td:first-child {
    position: sticky;
    left: 0;
    z-index: 1;
    border-right: 1px solid var(--border);
}

.analytics-table thead th:first-child {
    z-index: 3;
}

.analytics-table tbody tr:nth-child(even) td {
    background: var(--bg-light);
}

.analytics-table tbody tr:hover td {
    background: rgba(131, 102, 232, 0.08);
}

.analytics-table td.col-hover,
.analytics-table th.col-hover {
    background: rgba(131, 102, 232, 0.08);
}

/* Pill badges: value is always printed inside, so state
   is never conveyed by color alone */
.pill-badge {
    display: inline-block;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.pill-good { background: #d1fae5; color: #065f46; }
.pill-warn { background: #fef3c7; color: #92400e; }
.pill-bad  { background: #fee2e2; color: #7f1d1d; }
.pill-muted { background: var(--bg-light); color: var(--text-light); border: 1px solid var(--border); }

[data-theme="dark"] .pill-good { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }
[data-theme="dark"] .pill-warn { background: rgba(245, 158, 11, 0.2); color: #fcd34d; }
[data-theme="dark"] .pill-bad  { background: rgba(239, 68, 68, 0.2); color: #fca5a5; }

/* ============================================
   Micro-interactions (additive only)
   ============================================ */
/* Cards are structure, not controls. None of .admin-card / .stat-tile /
   .chart-card / .table-card / .stat-card is ever an anchor anywhere in
   templates/, so the hover lift these used to carry (translateY(-2px) +
   --shadow-lg) advertised a click target that does not exist. Depth states
   structure; interactivity is stated by the button tiers and by links.
   See DESIGN.md → "The Structure-Not-Signal Rule". */

a,
button,
.admin-btn,
.nav-link,
.nav-item {
    transition: background-color 150ms ease, color 150ms ease,
        box-shadow 150ms ease, border-color 150ms ease, transform 150ms ease;
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

@keyframes admin-fade-in {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.admin-main,
.analytics-container {
    animation: admin-fade-in 150ms var(--ease-out) both;
}

@media (prefers-reduced-motion: reduce) {
    a,
    button,
    .admin-btn,
    .nav-link,
    .nav-item {
        transition: none;
    }

    .admin-main,
    .analytics-container {
        animation: none;
    }
}

/* ============================================
   Mobile Responsiveness (under 768px)
   ============================================ */
@media (max-width: 768px) {
    /* Admin sidebar → hamburger menu */
    .admin-shell {
        flex-direction: column;
    }

    .admin-nav {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 0.75rem 1rem;
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        overflow-x: auto;
    }

    .admin-nav h2 {
        display: none;
    }

    .admin-nav a {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
        margin-bottom: 0;
        flex: 0 1 auto;
    }

    .admin-main {
        padding: 1.5rem;
        max-width: 100%;
    }

    /* Make tables horizontally scrollable */
    .admin-table,
    table.admin-table,
    .analytics-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
    }

    .admin-table thead,
    .admin-table tbody,
    table.admin-table thead,
    table.admin-table tbody {
        display: block;
    }

    .admin-table tr,
    table.admin-table tr,
    .analytics-table tr {
        display: inline-block;
        vertical-align: top;
        min-width: 100%;
    }

    /* Book pages and content full width */
    .content-panel {
        padding: 1rem;
    }

    .content-display {
        width: 100%;
    }

    .dashboard-container {
        padding: 1rem;
    }

    /* Student dashboard stats cards stack */
    .progress-card {
        margin-bottom: 1rem;
        padding: 1.25rem;
    }
}

@media (max-width: 600px) {
    .admin-main {
        padding: 1rem;
    }

    .admin-nav {
        padding: 0.5rem 0.75rem;
    }

    .admin-nav a {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .admin-btn {
        padding: 0.45rem 0.9rem;
        font-size: 0.8rem;
    }

    table.admin-table th,
    table.admin-table td {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
}

/* ============================================
   Dark theme: filled buttons
   ============================================ */
/* The dark palette brightens the accent (#8366e8 -> #9d84ff) because it has to read as INK on a
   dark ground: links, active nav items, focus rings. That same brightened value is wrong as a
   FILL behind a white label — white on #9d84ff measures 2.93:1, well under the 4.5:1 floor, and
   worse than the 4.0:1 the same button gets in light theme. So dark theme splits the two jobs:
   --primary stays the bright ink value, --primary-fill is the deeper value used behind white
   labels. Same for the semantic fills, which are brightened for the same reason.
   This is the Fill-Versus-Ink Rule (DESIGN.md) applied in the dark direction. */
:root {
    --primary-fill: var(--primary);
    --danger-fill: var(--danger);
    --success-fill: var(--success);
}
[data-theme="dark"] {
    --primary-fill: #7a5fe0;
    --danger-fill: #cc3b3b;
    --success-fill: #0b7a6e;
}
[data-theme="dark"] .admin-btn,
[data-theme="dark"] .filter-btn.active,
[data-theme="dark"] .hub-pill.active,
[data-theme="dark"] .mini-btn.primary,
[data-theme="dark"] .detail-action-button,
[data-theme="dark"] .tsb-btn,
[data-theme="dark"] .gj-submit,
[data-theme="dark"] .auth-submit,
[data-theme="dark"] .sl-grade-opt[aria-pressed="true"],
[data-theme="dark"] .sl-kind-opt[aria-pressed="true"],
[data-theme="dark"] .sl-rail-item[aria-current="true"] {
    background: var(--primary-fill);
    color: #fff;
}
[data-theme="dark"] .admin-btn:hover,
[data-theme="dark"] .detail-action-button:hover {
    background: #6a4fd0;
}
[data-theme="dark"] .admin-btn-danger,
[data-theme="dark"] .admin-btn-danger:hover {
    background: var(--danger-fill);
}
[data-theme="dark"] .qr-bulk {
    background: var(--success-fill);
    color: #fff;
}
/* syllabus.html carries its own blue accent rather than the site violet. */
[data-theme="dark"] .pm-btn.primary {
    background: #3f72d6;
    color: #fff;
}
/* Small destructive links sit on the page, not on a fill, so they take the bright ink value:
   #dc2626 on the dark ground is 3.9:1. */
[data-theme="dark"] .delete-class-btn,
[data-theme="dark"] a.delete-link,
[data-theme="dark"] .danger-link {
    color: #ff9a9a;
}