@import url("https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&family=IBM+Plex+Sans:wght@400;500;600&display=swap");

/* ============================================
   DESIGN SYSTEM – Premium Quiz Platform
   ============================================ */

:root {
    /* Core palette */
    --bg: #f0f4fa;
    --bg-subtle: #e8eef8;
    --surface: rgba(255, 255, 255, 0.82);
    --surface-strong: #ffffff;
    --surface-muted: #eef3fb;
    --surface-glass: rgba(255, 255, 255, 0.55);

    /* Text */
    --text: #111827;
    --text-muted: #64748b;
    --text-soft: #94a3b8;

    /* Borders & lines */
    --line: rgba(17, 24, 39, 0.07);
    --line-strong: rgba(17, 24, 39, 0.12);

    /* Primary – Indigo/Violet */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-soft: rgba(99, 102, 241, 0.10);
    --primary-glow: rgba(99, 102, 241, 0.25);
    --primary-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
    --primary-gradient-hover: linear-gradient(135deg, #4f46e5, #7c3aed, #8b5cf6);

    /* Semantic */
    --success: #10b981;
    --success-soft: rgba(16, 185, 129, 0.10);
    --danger: #ef4444;
    --danger-soft: rgba(239, 68, 68, 0.10);
    --warning: #f59e0b;
    --warning-soft: rgba(245, 158, 11, 0.10);
    --info: #3b82f6;

    /* Elevation */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.08), 0 8px 20px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 65px rgba(0, 0, 0, 0.10), 0 12px 30px rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

    /* Shape */
    --radius: 20px;
    --radius-sm: 12px;
    --radius-lg: 28px;
    --radius-xl: 36px;

    /* Motion */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration: 0.25s;
    --duration-slow: 0.4s;
}

[data-theme="dark"] {
    --bg: #0c0f1a;
    --bg-subtle: #111528;
    --surface: rgba(20, 24, 44, 0.88);
    --surface-strong: #161b33;
    --surface-muted: #1a2040;
    --surface-glass: rgba(20, 24, 44, 0.60);

    --text: #e8ecf4;
    --text-muted: #8b95b0;
    --text-soft: #5c6780;

    --line: rgba(226, 232, 240, 0.06);
    --line-strong: rgba(226, 232, 240, 0.10);

    --primary: #818cf8;
    --primary-hover: #a5b4fc;
    --primary-soft: rgba(129, 140, 248, 0.12);
    --primary-glow: rgba(129, 140, 248, 0.20);
    --primary-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #c084fc);
    --primary-gradient-hover: linear-gradient(135deg, #818cf8, #a78bfa, #c4b5fd);

    --success: #34d399;
    --success-soft: rgba(52, 211, 153, 0.12);
    --danger: #fb7185;
    --danger-soft: rgba(251, 113, 133, 0.12);
    --warning: #fbbf24;
    --warning-soft: rgba(251, 191, 36, 0.12);
    --info: #60a5fa;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.35);
    --shadow-xl: 0 25px 65px rgba(0, 0, 0, 0.40);
    --shadow-glow: 0 0 50px rgba(129, 140, 248, 0.15);
}

/* ============================================
   RESET & BASE
   ============================================ */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    font-family: "IBM Plex Sans", system-ui, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    background-image:
        radial-gradient(ellipse 80% 50% at 20% -10%, rgba(99, 102, 241, 0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 110%, rgba(16, 185, 129, 0.06), transparent),
        radial-gradient(ellipse 40% 30% at 50% 50%, rgba(139, 92, 246, 0.04), transparent);
    background-attachment: fixed;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration) var(--ease);
}

img {
    max-width: 100%;
}

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

h1, h2, h3, h4 {
    font-family: "Be Vietnam Pro", system-ui, sans-serif;
    line-height: 1.2;
    margin: 0;
}

/* ============================================
   APP SHELL
   ============================================ */

.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   HEADER
   ============================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    backdrop-filter: blur(24px) saturate(1.4);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    background: rgba(240, 244, 250, 0.72);
    border-bottom: 1px solid var(--line);
    transition: background var(--duration) var(--ease);
}

[data-theme="dark"] .site-header {
    background: rgba(12, 15, 26, 0.72);
}

.header-inner,
.page-content,
.footer-inner {
    width: min(1200px, calc(100% - 40px));
    margin: 0 auto;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 72px;
}

/* Brand */
.brand {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    transition: transform var(--duration) var(--ease);
}

.brand:hover {
    transform: translateY(-1px);
}

.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    font-family: "Be Vietnam Pro", sans-serif;
    font-weight: 800;
    font-size: 0.9rem;
    letter-spacing: 0.06em;
    color: #fff;
    background: var(--primary-gradient);
    box-shadow: 0 8px 24px var(--primary-glow);
    transition: transform var(--duration) var(--ease-spring), box-shadow var(--duration) var(--ease);
}

.brand:hover .brand-mark {
    transform: scale(1.06) rotate(-2deg);
    box-shadow: 0 12px 32px var(--primary-glow);
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.brand-copy strong {
    font-family: "Be Vietnam Pro", sans-serif;
    font-size: 1.05rem;
}

.brand-copy small {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Navigation */
.top-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-nav a,
.top-nav button {
    color: var(--text-muted);
    font-size: 0.92rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    transition: all var(--duration) var(--ease);
    position: relative;
}

.top-nav a:hover {
    color: var(--text);
    background: var(--primary-soft);
}

.top-nav a.is-active {
    color: var(--primary);
    font-weight: 600;
    background: var(--primary-soft);
}

.user-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px !important;
    border-radius: 999px !important;
    background: var(--primary-soft) !important;
    color: var(--primary) !important;
    font-weight: 600 !important;
    font-size: 0.88rem !important;
}

.ghost-link {
    padding: 8px 12px !important;
    font-size: 0.88rem !important;
    opacity: 0.7;
}

.ghost-link:hover {
    opacity: 1;
}

/* Theme & Nav Toggles */
.theme-toggle,
.nav-toggle {
    border: 1px solid var(--line);
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    color: var(--text);
    cursor: pointer;
    transition: all var(--duration) var(--ease);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: grid;
    place-items: center;
    font-size: 1rem;
}

.theme-toggle:hover {
    background: var(--primary-soft);
    border-color: var(--primary);
    transform: rotate(15deg);
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    border-radius: var(--radius-sm);
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: all var(--duration) var(--ease);
}

.nav-toggle:hover {
    background: var(--primary-soft);
}

/* ============================================
   MAIN CONTENT
   ============================================ */

.page-content {
    flex: 1;
    padding: 36px 0 80px;
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
    border-top: 1px solid var(--line);
    padding: 28px 0 36px;
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-meta {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ============================================
   TYPOGRAPHY HELPERS
   ============================================ */

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.72rem;
    padding: 6px 14px;
    background: var(--primary-soft);
    border-radius: 999px;
    margin-bottom: 14px;
}

.section-heading h1,
.section-heading h2 {
    margin: 8px 0 12px;
}

.section-heading p {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 60ch;
}

.auth-switch {
    margin-top: 18px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.92rem;
}

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

.auth-switch a:hover {
    text-decoration: underline;
}

/* ============================================
   CARDS – Glass Morphism
   ============================================ */

.hero-section,
.callout-banner,
.toolbar-panel,
.table-card,
.form-card,
.quiz-config-card,
.quiz-config-tips,
.auth-panel,
.notice-panel,
.side-panel-card,
.quiz-card,
.review-card,
.stat-card {
    background: var(--surface);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: box-shadow var(--duration-slow) var(--ease), transform var(--duration) var(--ease);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero-section {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 32px;
    padding: 48px 44px;
    overflow: hidden;
    position: relative;
    animation: fadeSlideUp 0.6s var(--ease) both;
}

.hero-section::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: heroPulse 6s ease-in-out infinite alternate;
}

.hero-section::after {
    content: "";
    position: absolute;
    bottom: -40%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.06), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: heroPulse 8s ease-in-out 2s infinite alternate;
}

.hero-copy {
    position: relative;
    z-index: 2;
}

.hero-copy h1 {
    font-size: clamp(2.2rem, 3.4vw, 4rem);
    line-height: 1.05;
    margin: 12px 0 16px;
    background: linear-gradient(135deg, var(--text) 40%, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-copy p {
    font-size: 1.08rem;
    color: var(--text-muted);
    max-width: 50ch;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.hero-panel {
    position: relative;
    z-index: 2;
    padding: 28px;
    border-radius: var(--radius);
    background:
        linear-gradient(155deg, rgba(99, 102, 241, 0.06), rgba(139, 92, 246, 0.03)),
        var(--surface-strong);
    border: 1px solid var(--line);
}

.hero-kpis {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.hero-kpis div {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    transition: all var(--duration) var(--ease);
    animation: fadeSlideUp 0.5s var(--ease) both;
}

.hero-kpis div:nth-child(1) { animation-delay: 0.1s; }
.hero-kpis div:nth-child(2) { animation-delay: 0.15s; }
.hero-kpis div:nth-child(3) { animation-delay: 0.2s; }
.hero-kpis div:nth-child(4) { animation-delay: 0.25s; }

.hero-kpis div:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: var(--primary-soft);
}

.hero-kpis strong,
.stat-card strong {
    display: block;
    font-family: "Be Vietnam Pro", sans-serif;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-kpis span,
.stat-card span {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 4px;
    display: block;
}

/* Timer badge */
.timer-badge {
    display: block;
    font-family: "Be Vietnam Pro", sans-serif;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
    margin: 16px 0 14px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Score pill */
.score-pill {
    font-family: "Be Vietnam Pro", sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    background: var(--primary-soft);
    color: var(--primary);
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid transparent;
}

/* Mini Timeline */
.mini-timeline {
    margin-top: 20px;
    display: grid;
    gap: 12px;
}

.mini-step {
    display: grid;
    grid-template-columns: 42px 1fr;
    align-items: center;
    gap: 14px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px;
    transition: all var(--duration) var(--ease);
}

.mini-step:hover {
    border-color: var(--primary-soft);
    background: var(--primary-soft);
}

.mini-step.is-active {
    border-color: rgba(99, 102, 241, 0.18);
}

.mini-step span {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-sm);
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 700;
    font-size: 0.95rem;
    transition: all var(--duration) var(--ease);
}

.mini-step:hover span {
    background: var(--primary-gradient);
    color: #fff;
    transform: scale(1.05);
}

.mini-step p {
    color: var(--text-muted);
    margin: 0;
    font-size: 0.9rem;
}

/* ============================================
   BUTTONS
   ============================================ */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    padding: 12px 22px;
    font-weight: 600;
    font-size: 0.92rem;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    position: relative;
    overflow: hidden;
}

.button::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
    transform: translateX(-100%);
    transition: transform 0.5s var(--ease);
}

.button:hover::after {
    transform: translateX(100%);
}

.button:hover {
    transform: translateY(-2px);
}

.button:active {
    transform: translateY(0) scale(0.98);
}

.button-primary {
    color: #fff;
    background: var(--primary-gradient);
    box-shadow: 0 4px 16px var(--primary-glow);
}

.button-primary:hover {
    background: var(--primary-gradient-hover);
    box-shadow: 0 8px 28px var(--primary-glow);
}

.button-secondary {
    color: var(--text);
    background: var(--surface-muted);
    border-color: var(--line);
}

.button-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-soft);
}

.button-danger {
    color: #fff;
    background: linear-gradient(135deg, #dc2626, #ef4444);
    box-shadow: 0 4px 16px rgba(239, 68, 68, 0.25);
}

.button-danger:hover {
    background: linear-gradient(135deg, #b91c1c, #dc2626);
    box-shadow: 0 8px 28px rgba(239, 68, 68, 0.30);
}

.button-small {
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 0.85rem;
}

.button-block {
    width: 100%;
}

/* ============================================
   FEATURE GRID
   ============================================ */

.feature-grid {
    display: grid;
    gap: 20px;
    margin: 32px 0;
    grid-template-columns: repeat(3, 1fr);
}

.feature-grid article {
    padding: 28px;
    background: var(--surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    transition: all var(--duration-slow) var(--ease);
    animation: fadeSlideUp 0.5s var(--ease) both;
    position: relative;
    overflow: hidden;
}

.feature-grid article:nth-child(1) { animation-delay: 0.1s; }
.feature-grid article:nth-child(2) { animation-delay: 0.2s; }
.feature-grid article:nth-child(3) { animation-delay: 0.3s; }

.feature-grid article::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--duration) var(--ease);
}

.feature-grid article:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.15);
}

.feature-grid article:hover::before {
    opacity: 1;
}

.feature-grid article h2 {
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.feature-grid article p {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.65;
    margin: 0;
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */

.content-section {
    margin: 36px 0;
}

.two-column {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.admin-two-column {
    align-items: start;
}

.section-heading.compact h1,
.section-heading.compact h2 {
    margin: 0 0 10px;
    font-size: 1.6rem;
}

/* Tag Cloud */
.tag-cloud {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.tag-pill {
    display: inline-flex;
    align-items: center;
    padding: 8px 18px;
    border-radius: 999px;
    background: var(--surface-muted);
    border: 1px solid var(--line);
    font-size: 0.88rem;
    font-weight: 500;
    transition: all var(--duration) var(--ease);
}

.tag-pill:hover {
    background: var(--primary-soft);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.meta-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 14px;
    border-radius: 999px;
    background: var(--surface-muted);
    border: 1px solid var(--line);
    font-size: 0.85rem;
    font-weight: 600;
}

.meta-pill.is-success {
    color: var(--success);
    background: var(--success-soft);
    border-color: transparent;
}

.meta-pill.is-danger {
    color: var(--danger);
    background: var(--danger-soft);
    border-color: transparent;
}

/* ============================================
   LEADERBOARD
   ============================================ */

.leaderboard {
    display: grid;
    gap: 12px;
}

.leaderboard-row {
    display: grid;
    grid-template-columns: 56px 1fr auto;
    gap: 14px;
    align-items: center;
    padding: 14px 18px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    background: var(--surface);
    transition: all var(--duration) var(--ease);
    animation: fadeSlideUp 0.4s var(--ease) both;
}

.leaderboard-row:nth-child(1) { animation-delay: 0.05s; }
.leaderboard-row:nth-child(2) { animation-delay: 0.1s; }
.leaderboard-row:nth-child(3) { animation-delay: 0.15s; }

.leaderboard-row:hover {
    transform: translateX(4px);
    border-color: var(--primary-soft);
    box-shadow: var(--shadow-sm);
}

/* Top 3 highlighting */
.leaderboard-row:nth-child(1) {
    border-left: 3px solid #fbbf24;
    background: linear-gradient(90deg, rgba(251, 191, 36, 0.06), transparent);
}

.leaderboard-row:nth-child(2) {
    border-left: 3px solid #94a3b8;
    background: linear-gradient(90deg, rgba(148, 163, 184, 0.06), transparent);
}

.leaderboard-row:nth-child(3) {
    border-left: 3px solid #cd7f32;
    background: linear-gradient(90deg, rgba(205, 127, 50, 0.06), transparent);
}

.leaderboard-row:nth-child(1) .rank { color: #fbbf24; font-size: 1.2rem; }
.leaderboard-row:nth-child(2) .rank { color: #94a3b8; font-size: 1.1rem; }
.leaderboard-row:nth-child(3) .rank { color: #cd7f32; font-size: 1.05rem; }

.rank {
    font-family: "Be Vietnam Pro", sans-serif;
    font-weight: 800;
    color: var(--primary);
    font-size: 1rem;
}

.leaderboard-row div small {
    color: var(--text-muted);
    font-size: 0.82rem;
}

/* ============================================
   CALLOUT BANNER
   ============================================ */

.callout-banner {
    margin-top: 32px;
    padding: 32px 36px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    position: relative;
    overflow: hidden;
    animation: fadeSlideUp 0.5s var(--ease) 0.3s both;
}

.callout-banner::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.callout-banner .eyebrow {
    margin-bottom: 8px;
}

.callout-banner h2 {
    font-size: 1.35rem;
    margin: 0;
}

/* ============================================
   AUTH PAGES
   ============================================ */

.auth-section {
    max-width: 520px;
    margin: 0 auto;
    animation: fadeSlideUp 0.5s var(--ease) both;
}

.auth-panel {
    padding: 36px;
}

.auth-panel h1 {
    font-size: 1.6rem;
    margin: 8px 0 10px;
}

.auth-panel > p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* ============================================
   FORMS
   ============================================ */

.stack-form,
.inline-form {
    display: grid;
    gap: 18px;
}

.stack-form label,
.quiz-config-card label {
    display: grid;
    gap: 8px;
    font-weight: 600;
    font-size: 0.92rem;
}

input,
select,
textarea {
    width: 100%;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--line-strong);
    background: var(--surface-strong);
    color: var(--text);
    padding: 12px 16px;
    font-size: 0.95rem;
    transition: all var(--duration) var(--ease);
    outline: none;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-soft), 0 0 16px var(--primary-glow);
}

textarea {
    resize: vertical;
}

/* ============================================
   ALERTS & FLASH MESSAGES
   ============================================ */

.alert,
.flash {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
    font-size: 0.92rem;
    animation: fadeSlideUp 0.3s var(--ease) both;
}

.alert-error,
.flash-error {
    background: var(--danger-soft);
    border: 1px solid rgba(239, 68, 68, 0.18);
    color: var(--danger);
}

.alert-warning {
    background: var(--warning-soft);
    border: 1px solid rgba(245, 158, 11, 0.18);
    color: var(--warning);
}

.flash-success {
    background: var(--success-soft);
    border: 1px solid rgba(16, 185, 129, 0.18);
    color: var(--success);
}

/* ============================================
   ADMIN DASHBOARD LAYOUT
   ============================================ */

.dashboard-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 24px;
    width: min(1280px, calc(100% - 40px));
    margin: 0 auto;
    padding-top: 28px;
}

.dashboard-layout .page-content {
    width: 100%;
    margin: 0;
    padding: 0 0 60px;
}

.sidebar {
    position: sticky;
    top: 96px;
    display: grid;
    gap: 6px;
    align-self: start;
    padding: 18px;
    background: var(--surface);
    backdrop-filter: blur(16px);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.sidebar-label {
    margin: 0 0 6px;
    padding: 0 10px;
    color: var(--text-soft);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.sidebar a {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--duration) var(--ease);
}

.sidebar a:hover {
    background: var(--primary-soft);
    color: var(--primary);
    transform: translateX(3px);
}

.sidebar a.is-active {
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
}

/* ============================================
   TOOLBAR & DATA TABLE
   ============================================ */

.toolbar-panel {
    padding: 24px;
}

.toolbar-form {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.toolbar-form > * {
    flex: 1 1 190px;
}

.table-card {
    padding: 24px;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 13px 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}

.data-table th {
    color: var(--text-soft);
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.data-table tr {
    transition: background var(--duration) var(--ease);
}

.data-table tbody tr:hover {
    background: var(--primary-soft);
}

.text-right {
    text-align: right;
}

/* ============================================
   QUIZ CONFIG
   ============================================ */

.quiz-config-layout {
    display: grid;
    grid-template-columns: minmax(0, 420px) minmax(0, 1fr);
    gap: 24px;
}

.quiz-config-card,
.quiz-config-tips {
    padding: 32px;
}

.quiz-config-tips h2 {
    margin-bottom: 16px;
}

.feature-list {
    display: grid;
    gap: 12px;
    padding-left: 18px;
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

.feature-list li {
    padding-left: 4px;
}

/* ============================================
   NOTICE PANEL
   ============================================ */

.notice-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    margin-bottom: 24px;
    border-left: 3px solid var(--primary);
}

.notice-panel strong {
    display: block;
    margin-bottom: 4px;
}

.notice-panel p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

/* ============================================
   QUIZ TAKING
   ============================================ */

.quiz-shell {
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
}

.quiz-side-panel {
    display: grid;
    gap: 18px;
    position: sticky;
    top: 96px;
}

.side-panel-card {
    padding: 22px;
}

.side-panel-card .eyebrow {
    margin-bottom: 8px;
}

.side-panel-card h2 {
    font-size: 1.15rem;
    margin-bottom: 6px;
}

.side-panel-card > p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

/* Progress */
.progress-track {
    width: 100%;
    height: 10px;
    border-radius: 999px;
    background: var(--surface-muted);
    overflow: hidden;
    margin-top: 8px;
}

.progress-fill {
    display: block;
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: var(--primary-gradient);
    transition: width 0.3s var(--ease);
    box-shadow: 0 0 12px var(--primary-glow);
}

.progress-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.progress-meta small {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.hint-text {
    color: var(--text-soft);
    font-size: 0.8rem;
    margin-top: 10px;
    line-height: 1.5;
}

/* Question Grid */
.question-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.question-grid button {
    cursor: pointer;
    min-height: 44px;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all var(--duration) var(--ease);
}

.question-grid button:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
}

.question-grid button.is-answered {
    background: var(--success-soft);
    border-color: rgba(16, 185, 129, 0.28);
    color: var(--success);
}

.question-grid button.is-current {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 12px var(--primary-glow);
}

/* Quiz Form & Cards */
.quiz-form {
    display: grid;
    gap: 18px;
}

.quiz-card {
    display: none;
    padding: 32px;
}

.quiz-card.is-visible {
    display: block;
    animation: fadeSlideUp 0.3s var(--ease) both;
}

.question-header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    margin-bottom: 18px;
}

.question-count {
    color: var(--text-soft);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.75rem;
}

.quiz-card h2 {
    font-size: 1.15rem;
    line-height: 1.5;
    margin: 0;
}

/* Option List */
.option-list,
.review-options {
    display: grid;
    gap: 12px;
    margin-top: 22px;
}

.option-item,
.review-option {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 16px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-strong);
    cursor: pointer;
    transition: all var(--duration) var(--ease);
}

.option-item:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
    transform: translateX(4px);
}

.option-item input {
    width: auto;
    margin-top: 3px;
    accent-color: var(--primary);
}

.option-key {
    min-width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: var(--surface-muted);
    font-weight: 700;
    font-size: 0.85rem;
    transition: all var(--duration) var(--ease);
}

.option-item:hover .option-key {
    background: var(--primary-gradient);
    color: #fff;
}

/* Quiz Controls */
.quiz-controls {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
}

/* ============================================
   RESULTS & REVIEW
   ============================================ */

.result-hero,
.page-hero,
.quiz-landing {
    animation: fadeSlideUp 0.5s var(--ease) both;
}

.result-hero .section-heading h1,
.page-hero .section-heading h1 {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.stat-card {
    padding: 24px;
    text-align: center;
    transition: all var(--duration) var(--ease);
    animation: fadeSlideUp 0.4s var(--ease) both;
}

.stat-card:nth-child(1) { animation-delay: 0.05s; }
.stat-card:nth-child(2) { animation-delay: 0.1s; }
.stat-card:nth-child(3) { animation-delay: 0.15s; }
.stat-card:nth-child(4) { animation-delay: 0.2s; }

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card strong {
    margin-bottom: 6px;
}

.inline-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.inline-stats {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.inline-correct {
    color: var(--success);
    font-weight: 700;
}

/* Result & Review list */
.result-list {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.review-card {
    padding: 28px;
    transition: all var(--duration) var(--ease);
}

.review-card.is-correct {
    border-color: rgba(16, 185, 129, 0.18);
    border-left: 3px solid var(--success);
}

.review-card.is-wrong {
    border-color: rgba(239, 68, 68, 0.18);
    border-left: 3px solid var(--danger);
}

.review-card h2 {
    margin: 0;
    font-size: 1.05rem;
    line-height: 1.5;
}

.review-option.is-correct {
    border-color: rgba(16, 185, 129, 0.28);
    background: var(--success-soft);
}

.review-option.is-selected-wrong {
    border-color: rgba(239, 68, 68, 0.28);
    background: var(--danger-soft);
}

.review-option.is-selected-correct {
    border-color: rgba(16, 185, 129, 0.28);
    background: rgba(16, 185, 129, 0.12);
}

.answer-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.explanation-box {
    margin-top: 18px;
    padding: 18px 20px;
    border-radius: var(--radius);
    background: var(--surface-muted);
    border-left: 3px solid var(--info);
}

.explanation-box strong {
    color: var(--info);
    font-size: 0.88rem;
}

/* ============================================
   EMPTY STATE
   ============================================ */

.empty-state {
    padding: 32px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    text-align: center;
    animation: fadeSlideUp 0.4s var(--ease) both;
}

.empty-state h2,
.empty-state h3 {
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--text-muted);
    margin-bottom: 16px;
}

.empty-state.compact,
.table-card .empty-state {
    padding: 20px;
}

/* ============================================
   PAGINATION
   ============================================ */

.pagination {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.pagination a {
    min-width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-sm);
    border: 1px solid var(--line);
    background: var(--surface);
    font-weight: 600;
    font-size: 0.88rem;
    transition: all var(--duration) var(--ease);
}

.pagination a:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-soft);
    transform: translateY(-2px);
}

.pagination a.is-active {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 12px var(--primary-glow);
}

/* ============================================
   PREVIEW
   ============================================ */

.preview-list {
    display: grid;
    gap: 14px;
}

.preview-item {
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.preview-item h3 {
    margin: 0;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.compact {
    gap: 8px;
}

.top-gap {
    margin-top: 18px;
}

.grid-two {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

/* ============================================
   KEYFRAME ANIMATIONS
   ============================================ */

@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes heroPulse {
    from {
        transform: scale(1);
        opacity: 0.7;
    }
    to {
        transform: scale(1.15);
        opacity: 1;
    }
}

@keyframes shimmer {
    from { transform: translateX(-100%); }
    to { transform: translateX(100%); }
}

/* ============================================
   RESPONSIVE – Tablet
   ============================================ */

@media (max-width: 1100px) {
    .dashboard-layout,
    .hero-section,
    .feature-grid,
    .two-column,
    .quiz-config-layout,
    .quiz-shell,
    .stat-grid {
        grid-template-columns: 1fr;
    }

    .stat-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .quiz-side-panel {
        position: static;
    }

    .callout-banner,
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ============================================
   RESPONSIVE – Mobile Nav
   ============================================ */

@media (max-width: 960px) {
    .nav-toggle {
        display: inline-flex;
    }

    .top-nav {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        left: 12px;
        right: 12px;
        padding: 16px;
        border-radius: var(--radius);
        background: var(--surface-strong);
        backdrop-filter: blur(20px);
        border: 1px solid var(--line);
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        align-items: stretch;
        animation: fadeSlideUp 0.2s var(--ease);
        z-index: 50;
    }

    .top-nav.is-open {
        display: flex;
    }

    .top-nav a,
    .top-nav button {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }

    .dashboard-layout {
        width: min(1200px, calc(100% - 32px));
    }

    .sidebar {
        position: fixed;
        inset: 88px 12px auto 12px;
        z-index: 30;
        transform: translateY(-12px);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
    }

    .sidebar.is-open {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }
}

/* ============================================
   RESPONSIVE – Small screens
   ============================================ */

@media (max-width: 720px) {
    .header-inner,
    .page-content,
    .footer-inner,
    .dashboard-layout {
        width: min(1200px, calc(100% - 24px));
    }

    .hero-section,
    .auth-panel,
    .form-card,
    .table-card,
    .toolbar-panel,
    .quiz-config-card,
    .quiz-config-tips,
    .review-card,
    .quiz-card,
    .side-panel-card,
    .callout-banner {
        padding: 22px;
        border-radius: var(--radius);
    }

    .hero-copy h1 {
        font-size: 2rem;
    }

    .feature-grid {
        gap: 14px;
        grid-template-columns: 1fr;
    }

    .stat-grid {
        grid-template-columns: 1fr 1fr;
    }

    .toolbar-form > * {
        flex: 1 1 100%;
    }

    .question-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .quiz-controls {
        justify-content: stretch;
    }

    .quiz-controls .button {
        flex: 1 1 100%;
    }

    .data-table th,
    .data-table td {
        white-space: nowrap;
    }

    .page-content {
        padding: 24px 0 60px;
    }

    .auth-section {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-kpis {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .stat-grid {
        grid-template-columns: 1fr;
    }

    .callout-banner {
        text-align: center;
    }

    .callout-banner .button {
        width: 100%;
    }

    .inline-actions {
        flex-direction: column;
        align-items: stretch;
    }
}

/* ============================================
   ADMIN PAGE ENHANCEMENTS
   ============================================ */

.admin-two-column {
    margin-top: 24px;
}


.form-card-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
}

.form-card-header.compact {
    margin-bottom: 14px;
    padding-bottom: 10px;
}

.form-card-header h2 {
    font-size: 1.15rem;
    margin: 0;
}

.form-card-header h3 {
    font-size: 1rem;
    margin: 0;
}

.form-card-header p {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin: 4px 0 0;
}

.form-divider {
    height: 1px;
    background: var(--line);
    margin: 8px 0;
}

.admin-tips-card {
    align-self: start;
}

.admin-tips-card .feature-list {
    font-size: 0.88rem;
    gap: 10px;
}

.admin-tips-card code {
    background: var(--surface-muted);
    padding: 2px 6px;
    border-radius: 6px;
    font-size: 0.82rem;
    color: var(--primary);
}

/* File upload styling */
.file-upload-label input[type="file"] {
    padding: 10px;
    border: 2px dashed var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface-muted);
    cursor: pointer;
    transition: all var(--duration) var(--ease);
}

.file-upload-label input[type="file"]:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
}

/* Code tag in tables */
.data-table code {
    background: var(--surface-muted);
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* Meta pill in tables */
.data-table .meta-pill {
    font-size: 0.78rem;
    padding: 4px 10px;
}