:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #60a5fa;
    --secondary: #7c3aed;
    --secondary-light: #a78bfa;
    --gradient-brand: linear-gradient(135deg, #1a73e8 0%, #7c3aed 100%);
    --gradient-brand-soft: linear-gradient(135deg, rgba(26, 115, 232, 0.08), rgba(124, 58, 237, 0.08));
    --bg-body: #f8fafc;
    --bg-surface: #ffffff;
    --bg-elevated: #f8fafc;
    --bg-muted: #f1f5f9;
    --bg-header: rgba(255, 255, 255, 0.96);
    --text-primary: #1f2937;
    --text-heading: #111827;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --text-faint: #9ca3af;
    --border-color: #e5e7eb;
    --border-light: #f1f5f9;
    --border-input: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-primary: 0 4px 16px rgba(26, 115, 232, 0.4);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-pill: 40px;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.7s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

body.dark-mode {
    --primary: #60a5fa;
    --primary-dark: #93c5fd;
    --primary-light: #93c5fd;
    --secondary: #a78bfa;
    --secondary-light: #c4b5fd;
    --gradient-brand: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
    --gradient-brand-soft: linear-gradient(135deg, rgba(96, 165, 250, 0.12), rgba(167, 139, 250, 0.12));
    --bg-body: #0f172a;
    --bg-surface: #1e293b;
    --bg-elevated: #0f172a;
    --bg-muted: #1e293b;
    --bg-header: rgba(15, 23, 42, 0.96);
    --text-primary: #e2e8f0;
    --text-heading: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-faint: #64748b;
    --border-color: #334155;
    --border-light: #334155;
    --border-input: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-primary: 0 4px 16px rgba(96, 165, 250, 0.3);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    line-height: 1.75;
    color: var(--text-primary);
    background-color: var(--bg-body);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

img,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

ul,
ol {
    list-style-position: outside;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 16px;
    flex-wrap: wrap;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-area svg {
    width: 40px;
    height: 40px;
    transition: transform var(--transition-fast);
}

.logo-area:hover svg {
    transform: scale(1.05) rotate(-3deg);
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 4px;
    flex-wrap: wrap;
}

.main-nav a {
    display: inline-block;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.main-nav a:hover {
    background-color: var(--bg-muted);
    color: var(--primary);
    text-decoration: none;
    transform: translateY(-1px);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.search-box {
    display: flex;
    align-items: center;
    background-color: var(--bg-muted);
    border-radius: 24px;
    padding: 4px 4px 4px 14px;
    border: 1px solid var(--border-input);
    transition: border-color var(--transition-fast), background-color var(--transition-base), box-shadow var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.12);
}

.search-box input {
    border: none;
    outline: none;
    background: transparent;
    font-size: 0.9rem;
    padding: 6px 0;
    width: 140px;
    color: inherit;
    font-family: inherit;
}

.search-box input::placeholder {
    color: var(--text-faint);
}

.search-box button {
    background: var(--primary);
    border: none;
    border-radius: 20px;
    padding: 6px 14px;
    color: #fff;
    font-size: 0.85rem;
    cursor: pointer;
    font-weight: 500;
    font-family: inherit;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
    background: var(--primary-dark);
    transform: scale(1.03);
}

.search-box button:active {
    transform: scale(0.97);
}

.dark-toggle {
    background: var(--bg-muted);
    border: 1px solid var(--border-input);
    border-radius: 50%;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    transition: background-color var(--transition-fast), border-color var(--transition-base), transform var(--transition-fast);
}

.dark-toggle:hover {
    transform: rotate(20deg) scale(1.05);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
    color: inherit;
    padding: 4px;
    line-height: 1;
    transition: transform var(--transition-fast);
}

.mobile-menu-btn:active {
    transform: scale(0.9);
}

.breadcrumb {
    padding: 12px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 4px;
    align-items: center;
}

.breadcrumb li + li::before {
    content: "›";
    margin: 0 6px;
    color: var(--text-faint);
}

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

.breadcrumb a:hover {
    color: var(--primary);
}

.hero-banner {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    margin: 16px 0 24px;
    min-height: 320px;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    isolation: isolate;
}

.hero-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.18), transparent 45%),
        radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.12), transparent 40%);
    z-index: 0;
    pointer-events: none;
}

.hero-banner::after {
    content: "";
    position: absolute;
    width: 480px;
    height: 480px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    top: -220px;
    right: -140px;
    z-index: 0;
    pointer-events: none;
}

.hero-slide {
    display: none;
    padding: 48px 32px;
    text-align: center;
    width: 100%;
    position: relative;
    z-index: 1;
}

.hero-slide.active {
    display: block;
    animation: heroFadeIn 0.6s ease both;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(14px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-slide h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    line-height: 1.3;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

.hero-slide p {
    font-size: 1.1rem;
    opacity: 0.92;
    max-width: 700px;
    margin: 0 auto 20px;
    line-height: 1.7;
}

.hero-cta {
    display: inline-block;
    background: #fff;
    color: var(--primary);
    padding: 12px 32px;
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: 1rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

.hero-cta:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
    color: var(--primary);
    text-decoration: none;
}

.hero-dots {
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 2;
}

.hero-dots button {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: background var(--transition-base), transform var(--transition-fast), width var(--transition-base);
    padding: 0;
}

.hero-dots button:hover {
    background: rgba(255, 255, 255, 0.8);
}

.hero-dots button.active {
    background: #fff;
    transform: scale(1.2);
    width: 24px;
    border-radius: 6px;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
    margin: 32px 0;
}

.stat-card {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    padding: 24px 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: var(--gradient-brand);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

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

.stat-card:hover::after {
    transform: scaleX(1);
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 6px;
}

.content-section {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.content-section:hover {
    box-shadow: var(--shadow-md);
}

.content-section h2 {
    font-size: 1.65rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-heading);
    position: relative;
    padding-left: 16px;
    line-height: 1.4;
}

.content-section h2::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 5px;
    border-radius: 4px;
    background: var(--gradient-brand);
}

.content-section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 24px 0 10px;
    color: var(--text-primary);
    line-height: 1.45;
}

.content-section h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 18px 0 8px;
    color: var(--text-secondary);
}

.content-section p {
    margin-bottom: 14px;
    color: var(--text-secondary);
}

.content-section ul,
.content-section ol {
    margin: 12px 0 16px 24px;
    color: var(--text-secondary);
}

.content-section li {
    margin-bottom: 6px;
}

.content-section li::marker {
    color: var(--primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin: 24px 0;
}

.feature-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    padding: 24px 20px;
    border: 1px solid var(--border-input);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--gradient-brand-soft);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.feature-card:hover::before {
    opacity: 1;
}

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

.feature-card h3 {
    margin-top: 0;
    font-size: 1.1rem;
}

.feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    font-size: 1.4rem;
    transition: transform var(--transition-fast);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(-6deg);
}

.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.article-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    padding: 22px 20px;
    border: 1px solid var(--border-input);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-base), border-color var(--transition-base);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.article-card h3 {
    font-size: 1.05rem;
    margin: 0 0 8px;
    line-height: 1.5;
}

.article-card h3 a {
    color: var(--text-heading);
    transition: color var(--transition-fast);
}

.article-card h3 a:hover {
    color: var(--primary);
    text-decoration: none;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-faint);
    margin-bottom: 10px;
}

.article-card p {
    font-size: 0.92rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    flex: 1;
}

.read-more {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    align-self: flex-start;
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.read-more:hover {
    text-decoration: none;
    transform: translateX(4px);
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    transition: border-color var(--transition-base), background-color var(--transition-base);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    padding: 16px 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    font-family: inherit;
    transition: color var(--transition-fast), padding var(--transition-fast);
    line-height: 1.6;
}

.faq-question:hover {
    color: var(--primary);
    padding-left: 6px;
}

.faq-icon {
    font-size: 1.2rem;
    transition: transform var(--transition-base), color var(--transition-fast);
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-muted);
    color: var(--primary);
}

.faq-item.open .faq-icon {
    transform: rotate(45deg);
    background: var(--primary);
    color: #fff;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease, opacity 0.35s ease;
    padding: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    opacity: 0;
}

.faq-item.open .faq-answer {
    max-height: 600px;
    padding: 0 0 18px;
    opacity: 1;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.92rem;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.data-table th,
.data-table td {
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    text-align: left;
}

.data-table th {
    background: var(--bg-muted);
    font-weight: 700;
    color: var(--text-heading);
}

.data-table td {
    color: var(--text-secondary);
}

.data-table tbody tr {
    transition: background-color var(--transition-fast);
}

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

.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-primary);
    transition: opacity var(--transition-base), transform var(--transition-fast), background-color var(--transition-fast);
    z-index: 900;
}

.back-to-top:hover {
    transform: translateY(-3px) scale(1.05);
    background: var(--primary-dark);
}

.back-to-top.visible {
    display: flex;
    animation: popIn 0.3s ease both;
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: scale(0.6);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
    will-change: opacity, transform;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.site-footer {
    background: #111827;
    color: #9ca3af;
    padding: 48px 0 24px;
    margin-top: 48px;
    transition: background-color var(--transition-base);
}

body.dark-mode .site-footer {
    background: #020617;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 36px;
}

.footer-col h4 {
    color: #f9fafb;
    font-size: 1rem;
    margin-bottom: 14px;
    font-weight: 700;
}

.footer-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-col li {
    margin-bottom: 8px;
    font-size: 0.88rem;
}

.footer-col a {
    color: #9ca3af;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
    display: inline-block;
}

.footer-col a:hover {
    color: #fff;
    text-decoration: none;
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid #1f2937;
    padding-top: 20px;
    text-align: center;
    font-size: 0.82rem;
    line-height: 1.8;
}

.footer-bottom a {
    color: #9ca3af;
}

.footer-bottom a:hover {
    color: #fff;
}

.text-muted {
    color: var(--text-muted);
    font-size: 0.88rem;
}

.inline-link {
    color: var(--primary);
    font-weight: 500;
}

.badge {
    display: inline-block;
    background: var(--bg-muted);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    margin-right: 6px;
}

.author-box {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    margin: 20px 0;
    border: 1px solid var(--border-input);
    transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-fast);
}

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

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.author-box:hover .author-avatar {
    transform: scale(1.08);
}

.author-info {
    font-size: 0.88rem;
}

.author-info strong {
    display: block;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.author-info span {
    color: var(--text-muted);
}

.update-time {
    font-size: 0.82rem;
    color: var(--text-faint);
    margin-top: 4px;
}

.anchor-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0 24px;
}

.anchor-nav a {
    font-size: 0.85rem;
    padding: 6px 14px;
    background: var(--bg-muted);
    border-radius: 20px;
    color: var(--text-primary);
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.anchor-nav a:hover {
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    transform: translateY(-2px);
}

@media (max-width: 900px) {
    .main-nav {
        display: none;
        width: 100%;
        order: 3;
    }

    .main-nav.open {
        display: block;
        animation: navSlideDown 0.3s ease both;
    }

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

    .main-nav ul {
        flex-direction: column;
        padding: 12px 0;
        gap: 2px;
    }

    .main-nav a {
        display: block;
        padding: 10px 14px;
    }

    .mobile-menu-btn {
        display: block;
    }

    .search-box input {
        width: 100px;
    }

    .hero-slide h1 {
        font-size: 1.6rem;
    }

    .hero-slide p {
        font-size: 0.95rem;
    }

    .content-section {
        padding: 24px 18px;
    }

    .content-section h2 {
        font-size: 1.35rem;
    }

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

@media (max-width: 500px) {
    .header-inner {
        gap: 8px;
    }

    .logo-text {
        font-size: 1.15rem;
    }

    .logo-area svg {
        width: 34px;
        height: 34px;
    }

    .search-box {
        padding-left: 10px;
    }

    .search-box input {
        width: 70px;
        font-size: 0.82rem;
    }

    .search-box button {
        padding: 5px 10px;
        font-size: 0.78rem;
    }

    .hero-slide {
        padding: 32px 16px;
    }

    .hero-slide h1 {
        font-size: 1.3rem;
    }

    .hero-slide p {
        font-size: 0.88rem;
    }

    .hero-cta {
        padding: 10px 24px;
        font-size: 0.92rem;
    }

    .stat-number {
        font-size: 1.7rem;
    }

    .stats-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stat-card {
        padding: 18px 12px;
    }

    .back-to-top {
        bottom: 18px;
        right: 18px;
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .content-section {
        padding: 20px 16px;
        border-radius: var(--radius-md);
    }

    .content-section h2 {
        font-size: 1.2rem;
    }

    .content-section h3 {
        font-size: 1.08rem;
    }

    .feature-grid,
    .article-list {
        grid-template-columns: 1fr;
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: 8px 10px;
    }

    .author-box {
        flex-direction: column;
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

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

    .reveal {
        opacity: 1;
        transform: none;
    }
}

@media print {
    .site-header,
    .back-to-top,
    .hero-banner,
    .site-footer,
    .anchor-nav,
    .dark-toggle,
    .mobile-menu-btn,
    .search-box {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    .content-section {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }
}

::selection {
    background: rgba(26, 115, 232, 0.2);
    color: inherit;
}

body.dark-mode ::selection {
    background: rgba(96, 165, 250, 0.3);
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-muted);
}

::-webkit-scrollbar-thumb {
    background: var(--text-faint);
    border-radius: 6px;
    border: 2px solid var(--bg-muted);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}