:root {
    --bg: #eef4ff;
    --bg-accent: #dbeafe;
    --surface: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --primary: #1d4ed8;
    --primary-dark: #1e3a8a;
    --primary-soft: #eff6ff;
    --accent: #f59e0b;
    --accent-soft: #fffbeb;
    --success: #059669;
    --success-bg: #ecfdf5;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --border: #dbe3f0;
    --shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
    --shadow-sm: 0 4px 16px rgba(15, 23, 42, 0.06);
    --radius: 18px;
    --header-height: 72px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
    background:
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 28%),
        radial-gradient(circle at top left, rgba(245, 158, 11, 0.08), transparent 24%),
        var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: min(1120px, calc(100% - 1.5rem));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(219, 227, 240, 0.95);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: var(--header-height);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text);
}

.brand:hover {
    text-decoration: none;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), #2563eb);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
}

.brand-text {
    display: grid;
    gap: 0.1rem;
}

.brand-text strong {
    font-size: 1rem;
    line-height: 1.2;
}

.brand-text small {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 500;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 0 auto;
    background: var(--text);
    border-radius: 999px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem 0.75rem;
}

.site-nav a {
    color: var(--muted);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.55rem 0.85rem;
    border-radius: 999px;
    text-decoration: none;
    transition: background 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
    color: var(--primary);
    background: var(--primary-soft);
    text-decoration: none;
}

.site-nav .nav-admin {
    color: var(--muted);
    font-size: 0.875rem;
}

.main-content {
    padding: 1.75rem 0 3.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

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

.hero-home,
.seo-hero {
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(239, 246, 255, 0.98)),
        linear-gradient(135deg, var(--primary-soft), #fff);
    border-color: rgba(147, 197, 253, 0.45);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin: 1.25rem 0 0.5rem;
}

.stat-pill {
    display: grid;
    gap: 0.15rem;
    padding: 0.9rem 1rem;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(191, 219, 254, 0.8);
    text-align: center;
}

.stat-pill strong {
    font-size: 1.35rem;
    color: var(--primary-dark);
    line-height: 1.1;
}

.stat-pill span {
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.hero h1,
.question-card h1,
.results-card h1 {
    margin-top: 0;
    line-height: 1.15;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    letter-spacing: -0.02em;
}

.hero-home h1,
.seo-hero h1 {
    background: linear-gradient(135deg, var(--primary-dark), #2563eb);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p,
.muted {
    color: var(--muted);
}

.hero-actions,
.page-heading {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

.page-heading {
    justify-content: space-between;
    margin-bottom: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0.8rem 1.35rem;
    border-radius: 999px;
    border: 1px solid transparent;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #2563eb);
    color: #fff;
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.22);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

.btn-secondary,
.btn-outline {
    background: #fff;
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover,
.btn-outline:hover {
    background: var(--primary-soft);
    border-color: #93c5fd;
    color: var(--primary-dark);
}

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

.section-card {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.15rem;
    background: #fff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.section-card:hover {
    border-color: #bfdbfe;
    box-shadow: var(--shadow-sm);
}

.section-card h3 {
    margin: 0 0 0.25rem;
}

.stats-grid,
.results-grid,
.score-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.stats-grid span,
.result-stat span,
.score-bar span {
    display: block;
    color: var(--muted);
    font-size: 0.9rem;
}

.stats-grid strong,
.result-stat strong,
.score-bar strong {
    font-size: 1.4rem;
}

.steps-list {
    padding-left: 1.2rem;
}

.practice-meta,
.score-bar {
    margin-bottom: 1rem;
}

.progress-track {
    width: 100%;
    height: 10px;
    background: #e5e7eb;
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #2563eb, #059669);
}

.question-number {
    color: var(--muted);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.sign-image-wrap {
    text-align: center;
    margin: 1rem 0 1.5rem;
    padding: 1rem;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.sign-image {
    max-width: min(280px, 100%);
    height: auto;
    display: inline-block;
}

.traffic-sign-card {
    max-width: 420px;
}

.answer-form fieldset {
    border: 0;
    margin: 0 0 1.5rem;
    padding: 0;
}

.option-label {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.option-label:hover,
.option-label.selected {
    border-color: var(--primary);
    background: #eff6ff;
}

.option-label input {
    margin-top: 0.25rem;
}

.option-key {
    font-weight: 700;
    min-width: 1.5rem;
}

.result-panel {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
}

.result-success {
    background: var(--success-bg);
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.result-error {
    background: var(--error-bg);
    border: 1px solid #fecaca;
    color: #991b1b;
}

.explanation-box {
    background: #f8fafc;
    border-left: 4px solid var(--primary);
    padding: 1rem;
    margin-bottom: 1rem;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 700;
}

.result-stat.success strong {
    color: var(--success);
}

.result-stat.error strong {
    color: var(--error);
}

.final-score {
    text-align: center;
    padding: 1.5rem;
    border-radius: 16px;
    margin: 1.5rem 0;
}

.final-score span,
.final-score small {
    display: block;
}

.final-score strong {
    font-size: 2.5rem;
    line-height: 1.1;
}

.final-score.pass {
    background: var(--success-bg);
    color: #065f46;
}

.final-score.fail {
    background: var(--error-bg);
    color: #991b1b;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
}

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

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

th,
td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

th {
    background: #f8fafc;
}

.table-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.danger-link {
    color: var(--error);
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 700;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success);
}

.badge-muted {
    background: #f3f4f6;
    color: var(--muted);
}

.alert {
    padding: 0.9rem 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
}

.alert-success {
    background: var(--success-bg);
    color: #065f46;
}

.alert-error {
    background: var(--error-bg);
    color: #991b1b;
}

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

.stack-form label,
.filter-form label {
    display: grid;
    gap: 0.4rem;
    font-weight: 600;
}

.stack-form input,
.stack-form textarea,
.stack-form select,
.filter-form select {
    width: 100%;
    padding: 0.85rem 0.95rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    font: inherit;
    background: #fff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.stack-form input:focus,
.stack-form textarea:focus,
.stack-form select:focus,
.filter-form select:focus {
    outline: none;
    border-color: #93c5fd;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

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

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 0.5rem;
}

.auth-card,
.narrow-form {
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

.auth-card {
    border-color: rgba(147, 197, 253, 0.45);
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(239, 246, 255, 0.98)),
        #fff;
}

.guest-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    color: var(--primary-dark);
    border: 1px solid #bfdbfe;
    font-size: 0.875rem;
    font-weight: 700;
}

.guest-welcome {
    margin-bottom: 0.5rem;
}

.status-pill {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 600;
    white-space: nowrap;
}

.status-pass {
    background: var(--success-bg);
    color: #065f46;
}

.status-fail {
    background: var(--error-bg);
    color: #991b1b;
}

.status-progress {
    background: #dbeafe;
    color: #1e40af;
}

.status-idle {
    background: var(--surface-muted, #f3f4f6);
    color: var(--text-muted, #4b5563);
}

.review-list {
    display: grid;
    gap: 1rem;
}

.review-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
}

.btn.disabled {
    opacity: 0.6;
    pointer-events: none;
    cursor: not-allowed;
}

.phase-progress-list {
    display: grid;
    gap: 0.75rem;
}

.phase-progress-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.15rem;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #fff;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.phase-progress-item:hover {
    box-shadow: var(--shadow-sm);
}

.phase-progress-item.phase-passed {
    border-color: #86efac;
    background: var(--success-bg);
}

.phase-progress-item.phase-failed {
    border-color: #fca5a5;
    background: var(--error-bg);
}

.phase-progress-item.phase-available {
    background: #eff6ff;
}

.phase-progress-item.phase-locked {
    opacity: 0.7;
}

.btn-small {
    padding: 0.35rem 0.75rem;
    font-size: 0.875rem;
}

body.protected-test .main-content {
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

body.protected-test img {
    -webkit-user-drag: none;
    user-drag: none;
    pointer-events: none;
}

body.protected-test .option-label {
    pointer-events: auto;
}

body.protected-test .option-label input {
    pointer-events: auto;
}

body.protected-test button,
body.protected-test a,
body.protected-test input,
body.protected-test label {
    -webkit-user-select: none;
    user-select: none;
}

.protect-watermark {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 4000;
    overflow: hidden;
}

.protect-watermark::before,
.protect-watermark::after {
    content: attr(data-watermark);
    position: absolute;
    left: 50%;
    width: 200%;
    transform: translateX(-50%) rotate(-24deg);
    text-align: center;
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    color: #111827;
    opacity: 0.05;
    white-space: nowrap;
}

.protect-watermark::before {
    top: 20%;
}

.protect-watermark::after {
    top: 60%;
}

.protect-shield {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: rgba(17, 24, 39, 0.92);
    color: #fff;
    text-align: center;
    font-size: 1.125rem;
}

.protect-shield[hidden] {
    display: none !important;
}

body.content-shielded .main-content,
body.content-shielded .site-header,
body.content-shielded .site-footer,
body.content-shielded .protect-watermark {
    filter: blur(14px);
}

@media print {
    body.protected-test .main-content,
    body.protected-test .site-header,
    body.protected-test .protect-watermark {
        display: none !important;
    }

    body.protected-test::after {
        content: 'Printing is disabled for practice test content.';
        display: block;
        padding: 2rem;
        font-size: 1.25rem;
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.breadcrumbs ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 0 0 1rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.breadcrumbs li:not(:last-child)::after {
    content: '/';
    margin-left: 0.5rem;
    color: var(--border);
}

.faq-list {
    display: grid;
    gap: 0.75rem;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    background: #fff;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
}

.link-grid,
.sign-grid,
.article-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.link-card,
.sign-card,
.article-card {
    display: block;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.15rem;
    background: #fff;
    color: inherit;
    text-decoration: none;
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.link-card:hover,
.sign-card:hover,
.article-card:hover {
    border-color: #93c5fd;
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
    text-decoration: none;
}

.link-card span,
.article-card p {
    display: block;
    margin-top: 0.35rem;
    color: var(--muted);
    font-size: 0.92rem;
}

.sign-card {
    text-align: center;
}

.sign-card img,
.sign-image {
    display: block;
    max-width: 120px;
    max-height: 120px;
    margin: 0 auto 0.75rem;
    object-fit: contain;
}

.sign-image-wrap {
    margin: 1rem 0;
}

.sample-options {
    padding-left: 1.25rem;
}

.footer-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    padding: 2rem 0 1rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0.5rem 0 0;
}

.footer-links li + li {
    margin-top: 0.35rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding: 1rem 0 1.5rem;
}

.site-footer {
    background: linear-gradient(180deg, #0f172a, #111827);
    color: #e5e7eb;
    margin-top: 2rem;
    padding: 0;
}

.site-footer .muted {
    color: #94a3b8;
}

.site-footer a {
    color: #dbeafe;
    text-decoration: none;
}

.site-footer a:hover {
    color: #fff;
    text-decoration: underline;
}

.table-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.inline-form {
    display: inline;
}

.link-button {
    background: none;
    border: 0;
    color: var(--error);
    cursor: pointer;
    padding: 0;
    font: inherit;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.seo-hero .hero-actions {
    margin-top: 1rem;
}

.article-content p + p {
    margin-top: 1rem;
}

.legal-content h2 {
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
}

.legal-content h2:first-child {
    margin-top: 0;
}

.legal-content ul {
    padding-left: 1.25rem;
    margin: 0.75rem 0 1rem;
}

.legal-content li + li {
    margin-top: 0.35rem;
}

.footer-bottom a {
    color: #dbeafe;
    margin-left: 0.35rem;
}

img[loading="lazy"] {
    content-visibility: auto;
}

@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
        align-items: center;
        padding: 0.85rem 0;
        min-height: auto;
    }

    .nav-toggle {
        display: inline-flex;
        margin-left: auto;
    }

    .site-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0.35rem;
        padding: 0.75rem 0 0.25rem;
    }

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

    .site-nav a,
    .site-nav .guest-badge {
        width: 100%;
        justify-content: center;
        text-align: center;
    }

    .site-nav .guest-badge {
        display: inline-flex;
    }

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

    .phase-progress-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-actions,
    .page-heading {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn,
    .page-heading .btn {
        width: 100%;
    }
}

@media (max-width: 640px) {
    .container {
        width: min(1120px, calc(100% - 1rem));
    }

    .card {
        padding: 1.1rem;
        border-radius: 16px;
    }

    .brand-text small {
        display: none;
    }

    .final-score strong {
        font-size: 2rem;
    }

    .stats-grid strong,
    .result-stat strong,
    .score-bar strong {
        font-size: 1.2rem;
    }

    .option-label {
        padding: 0.9rem;
    }
}