:root {
    --color-bg: #0a0e17;
    --color-bg-alt: #111827;
    --color-bg-card: #1a2332;
    --color-surface: #1f2937;
    --color-border: #2d3748;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-primary: #06b6d4;
    --color-primary-glow: rgba(6, 182, 212, 0.15);
    --color-accent: #8b5cf6;
    --color-accent-glow: rgba(139, 92, 246, 0.15);
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --transition: 0.2s ease;
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

a:hover {
    color: var(--color-accent);
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.25rem;
}

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

.logo-icon {
    color: var(--color-primary);
}

.main-nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
    background: var(--color-bg-card);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
}

.site-main {
    flex: 1;
    padding: 48px 0;
}

.hero {
    text-align: center;
    padding: 80px 0 60px;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), #0891b2);
    color: white;
    box-shadow: 0 4px 16px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(6, 182, 212, 0.4);
    color: white;
}

.btn-secondary {
    background: var(--color-bg-card);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-surface);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: all var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg), 0 0 30px var(--color-primary-glow);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--color-border);
}

.card-body {
    padding: 24px;
}

.card-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.card-category {
    background: var(--color-primary-glow);
    color: var(--color-primary);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
}

.card-title a {
    color: var(--color-text);
}

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

.card-excerpt {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.card-link {
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.card-link::after {
    content: '→';
    transition: transform var(--transition);
}

.card-link:hover::after {
    transform: translateX(4px);
}

.featured-card {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 360px;
}

.featured-card .card-image {
    height: 100%;
    border-bottom: none;
    border-right: 1px solid var(--color-border);
}

.featured-card .card-body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 40px;
}

.featured-card .card-title {
    font-size: 1.75rem;
}

.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 60px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 40px 0 16px;
    color: var(--color-text);
}

.article-content p {
    margin-bottom: 20px;
    color: var(--color-text-muted);
}

.article-disclaimer {
    margin-top: 48px;
    padding: 24px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-md);
}

.article-disclaimer p {
    margin: 0;
    color: var(--color-warning);
    font-size: 0.9rem;
}

.page-header {
    text-align: center;
    padding: 60px 0 40px;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-description {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.glossary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.glossary-item {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: 24px;
    transition: all var(--transition);
}

.glossary-item:hover {
    border-color: var(--color-primary);
}

.glossary-term {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.glossary-definition {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: all var(--transition);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.contact-info {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: 40px;
}

.contact-info h3 {
    font-size: 1.3rem;
    margin-bottom: 24px;
}

.contact-detail {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.contact-detail-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary-glow);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-detail-text h4 {
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.contact-detail-text p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.policy-content {
    max-width: 800px;
    margin: 0 auto;
}

.policy-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 36px 0 12px;
}

.policy-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 28px 0 10px;
}

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

.policy-content ul {
    margin: 0 0 16px 24px;
    color: var(--color-text-muted);
}

.policy-content li {
    margin-bottom: 8px;
}

.policy-content strong {
    color: var(--color-text);
}

.error-page {
    text-align: center;
    padding: 120px 0;
}

.error-code {
    font-size: 8rem;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.error-message {
    font-size: 1.5rem;
    margin-bottom: 32px;
}

.site-footer {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: 60px 0 32px;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-tagline {
    color: var(--color-text-muted);
    margin-top: 16px;
    font-size: 0.95rem;
}

.footer-links h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.footer-disclaimer {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    opacity: 0.7;
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg-alt);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 16px;
    }

    .main-nav.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .featured-card {
        grid-template-columns: 1fr;
    }

    .featured-card .card-image {
        height: 200px;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

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

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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