@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");

:root {
    --bg: #f3f6fb;
    --surface: rgba(255, 255, 255, 0.9);
    --surface-strong: #ffffff;
    --surface-muted: #eef3fb;
    --text: #162031;
    --text-muted: #6c7890;
    --line: rgba(17, 24, 39, 0.08);
    --primary: #1c64f2;
    --primary-soft: rgba(28, 100, 242, 0.12);
    --success: #0f9d58;
    --danger: #dc2626;
    --warning: #d97706;
    --shadow: 0 18px 45px rgba(17, 24, 39, 0.08);
    --radius: 24px;
}

[data-theme="dark"] {
    --bg: #0d1320;
    --surface: rgba(18, 25, 39, 0.92);
    --surface-strong: #121927;
    --surface-muted: #182133;
    --text: #e5edf8;
    --text-muted: #9db0c8;
    --line: rgba(226, 232, 240, 0.08);
    --primary: #6ba4ff;
    --primary-soft: rgba(107, 164, 255, 0.16);
    --success: #41c98b;
    --danger: #ff8a8a;
    --warning: #ffb547;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "IBM Plex Sans", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(28, 100, 242, 0.08), transparent 28%),
        radial-gradient(circle at bottom right, rgba(15, 157, 88, 0.08), transparent 22%),
        var(--bg);
    color: var(--text);
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    backdrop-filter: blur(18px);
    background: rgba(243, 246, 251, 0.78);
    border-bottom: 1px solid var(--line);
}

[data-theme="dark"] .site-header {
    background: rgba(13, 19, 32, 0.78);
}

.header-inner,
.page-content,
.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 78px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 14px;
}

.brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    font-family: "Be Vietnam Pro", sans-serif;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: #fff;
    background: linear-gradient(135deg, #1640a8, #1c64f2 60%, #53b1fd);
    box-shadow: 0 14px 32px rgba(28, 100, 242, 0.28);
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand-copy strong,
h1,
h2,
h3 {
    font-family: "Be Vietnam Pro", sans-serif;
}

.brand-copy small {
    color: var(--text-muted);
    font-size: 0.86rem;
}

.top-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.top-nav a,
.top-nav button {
    color: var(--text-muted);
}

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

.user-chip,
.ghost-link {
    padding: 10px 14px;
    border-radius: 999px;
}

.user-chip {
    background: var(--surface-muted);
    color: var(--text);
}

.theme-toggle,
.nav-toggle {
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text);
    border-radius: 16px;
    cursor: pointer;
}

.theme-toggle {
    width: 44px;
    height: 44px;
}

.nav-toggle {
    display: none;
    width: 48px;
    height: 48px;
    padding: 0;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
}

.page-content {
    flex: 1;
    padding: 34px 0 60px;
}

.site-footer {
    border-top: 1px solid var(--line);
    padding: 24px 0 34px;
}

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

.footer-meta {
    font-size: 0.95rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.78rem;
}

.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);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.hero-section {
    display: grid;
    grid-template-columns: 1.35fr 0.95fr;
    gap: 26px;
    padding: 36px;
    overflow: hidden;
}

.hero-copy h1,
.section-heading h1 {
    font-size: clamp(2.4rem, 3.7vw, 4.6rem);
    line-height: 1.05;
    margin: 16px 0;
}

.hero-copy p,
.section-heading p {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 64ch;
}

.hero-actions,
.inline-actions,
.progress-meta,
.answer-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 16px;
    border: 1px solid transparent;
    padding: 12px 18px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

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

.button-primary {
    color: #fff;
    background: linear-gradient(135deg, #1640a8, #1c64f2);
}

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

.button-danger {
    color: #fff;
    background: linear-gradient(135deg, #b91c1c, #dc2626);
}

.button-small {
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 0.92rem;
}

.button-block {
    width: 100%;
}

.hero-panel {
    padding: 24px;
    border-radius: calc(var(--radius) - 4px);
    background:
        linear-gradient(155deg, rgba(28, 100, 242, 0.08), rgba(83, 177, 253, 0.04)),
        var(--surface-strong);
}

.hero-kpis {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.hero-kpis div,
.mini-step,
.question-grid button {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 16px;
}

.hero-kpis strong,
.stat-card strong,
.timer-badge,
.score-pill {
    display: block;
    font-family: "Be Vietnam Pro", sans-serif;
    font-size: 1.8rem;
    line-height: 1;
}

.hero-kpis span,
.stat-card span,
.mini-step p,
.progress-meta small,
.hint-text {
    color: var(--text-muted);
}

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

.mini-step {
    display: grid;
    grid-template-columns: 40px 1fr;
    align-items: center;
    gap: 12px;
}

.mini-step span {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 700;
}

.feature-grid,
.stat-grid,
.grid-two {
    display: grid;
    gap: 18px;
}

.feature-grid {
    margin: 28px 0;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-grid article,
.empty-state,
.preview-item {
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.content-section {
    margin: 30px 0;
}

.two-column {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

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

.section-heading.compact h1,
.section-heading.compact h2 {
    margin: 0 0 10px;
    font-size: 1.7rem;
}

.tag-cloud {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.tag-pill,
.meta-pill,
.score-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--surface-muted);
    border: 1px solid var(--line);
}

.meta-pill.is-success {
    color: var(--success);
}

.meta-pill.is-danger {
    color: var(--danger);
}

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

.leaderboard-row {
    display: grid;
    grid-template-columns: 64px 1fr auto;
    gap: 14px;
    align-items: center;
    padding: 16px 18px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: var(--surface);
}

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

.callout-banner {
    margin-top: 28px;
    padding: 28px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
}

.auth-section {
    max-width: 560px;
    margin: 0 auto;
}

.auth-panel,
.form-card,
.table-card,
.toolbar-panel {
    padding: 28px;
}

.stack-form,
.inline-form {
    display: grid;
    gap: 16px;
}

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

input,
select,
textarea {
    width: 100%;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: var(--surface-strong);
    color: var(--text);
    padding: 13px 16px;
}

textarea {
    resize: vertical;
}

.alert,
.flash {
    padding: 16px 18px;
    border-radius: 18px;
    margin-bottom: 18px;
}

.alert-error,
.flash-error {
    background: rgba(220, 38, 38, 0.1);
    border: 1px solid rgba(220, 38, 38, 0.18);
    color: var(--danger);
}

.alert-warning {
    background: rgba(217, 119, 6, 0.1);
    border: 1px solid rgba(217, 119, 6, 0.18);
    color: var(--warning);
}

.flash-success {
    background: rgba(15, 157, 88, 0.1);
    border: 1px solid rgba(15, 157, 88, 0.18);
    color: var(--success);
}

.dashboard-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 22px;
    width: min(1280px, calc(100% - 32px));
    margin: 0 auto;
    padding-top: 28px;
}

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

.sidebar {
    position: sticky;
    top: 102px;
    display: grid;
    gap: 10px;
    align-self: start;
    padding: 20px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.sidebar-label {
    margin: 0 0 4px;
    color: var(--text-muted);
    font-size: 0.84rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.sidebar a {
    padding: 12px 14px;
    border-radius: 14px;
    color: var(--text-muted);
}

.sidebar a.is-active,
.sidebar a:hover {
    background: var(--primary-soft);
    color: var(--primary);
}

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

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

.table-card {
    overflow-x: auto;
}

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

.data-table th,
.data-table td {
    padding: 14px 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}

.data-table th {
    color: var(--text-muted);
    font-size: 0.88rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.quiz-config-layout,
.quiz-shell {
    display: grid;
    gap: 24px;
}

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

.quiz-config-card,
.quiz-config-tips {
    padding: 28px;
}

.feature-list {
    display: grid;
    gap: 10px;
    padding-left: 18px;
    color: var(--text-muted);
}

.notice-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 22px 24px;
    margin-bottom: 24px;
}

.quiz-shell {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: start;
}

.quiz-side-panel {
    display: grid;
    gap: 18px;
    position: sticky;
    top: 98px;
}

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

.timer-badge {
    margin: 16px 0 14px;
}

.progress-track {
    width: 100%;
    height: 12px;
    border-radius: 999px;
    background: var(--surface-muted);
    overflow: hidden;
}

.progress-fill {
    display: block;
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: linear-gradient(135deg, #1c64f2, #53b1fd);
    transition: width 0.2s ease;
}

.question-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
}

.question-grid button {
    cursor: pointer;
    min-height: 48px;
    color: var(--text);
}

.question-grid button.is-answered {
    background: rgba(15, 157, 88, 0.15);
    border-color: rgba(15, 157, 88, 0.28);
}

.question-grid button.is-current {
    background: var(--primary);
    color: #fff;
    border-color: transparent;
}

.quiz-form {
    display: grid;
    gap: 18px;
}

.quiz-card {
    display: none;
    padding: 28px;
}

.quiz-card.is-visible {
    display: block;
    animation: fadeIn 0.24s ease;
}

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

.question-count {
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.78rem;
}

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

.option-item,
.review-option {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface-strong);
}

.option-item input {
    width: auto;
    margin-top: 2px;
}

.option-key {
    min-width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: var(--surface-muted);
    font-weight: 700;
}

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

.result-list {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.review-card {
    padding: 24px;
}

.review-card.is-correct {
    border-color: rgba(15, 157, 88, 0.18);
}

.review-card.is-wrong {
    border-color: rgba(220, 38, 38, 0.18);
}

.review-option.is-correct {
    border-color: rgba(15, 157, 88, 0.28);
    background: rgba(15, 157, 88, 0.08);
}

.review-option.is-selected-wrong {
    border-color: rgba(220, 38, 38, 0.28);
    background: rgba(220, 38, 38, 0.08);
}

.review-option.is-selected-correct {
    border-color: rgba(15, 157, 88, 0.28);
    background: rgba(15, 157, 88, 0.12);
}

.answer-meta {
    margin-top: 16px;
    color: var(--text-muted);
}

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

.pagination {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.pagination a {
    min-width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--surface);
}

.pagination a.is-active {
    background: var(--primary);
    color: #fff;
    border-color: transparent;
}

.preview-item h3,
.review-card h2,
.quiz-card h2 {
    margin: 0;
}

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

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

.compact {
    gap: 8px;
}

.empty-state.compact,
.table-card .empty-state {
    padding: 16px;
}

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

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

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

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

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

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

    .top-nav {
        display: none;
        position: absolute;
        top: calc(100% + 12px);
        left: 16px;
        right: 16px;
        padding: 16px;
        border-radius: 20px;
        background: var(--surface-strong);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
        flex-direction: column;
        align-items: stretch;
    }

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

    .dashboard-layout {
        width: min(1180px, calc(100% - 32px));
    }

    .sidebar {
        position: fixed;
        inset: 96px 16px auto 16px;
        z-index: 30;
        transform: translateY(-18px);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.2s ease, opacity 0.2s ease;
    }

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

@media (max-width: 720px) {
    .header-inner,
    .page-content,
    .footer-inner,
    .dashboard-layout {
        width: min(1180px, 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: 20px;
        border-radius: 22px;
    }

    .hero-copy h1,
    .section-heading h1 {
        font-size: 2.2rem;
    }

    .feature-grid {
        gap: 14px;
    }

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

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

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

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

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