@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700;900&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
    --color-bg: #0a0a1a;
    --color-bg-section: #0f0f2a;
    --color-bg-card: #161638;
    --color-primary: #c9a84c;
    --color-primary-light: #e8d48b;
    --color-accent: #7b68ee;
    --color-accent-light: #9d8ffa;
    --color-text: #e8e6f0;
    --color-text-muted: #a0a0c0;
    --color-text-dim: #6a6a8a;
    --color-border: #2a2a5a;
    --color-star: #ffd700;
    --gradient-hero: linear-gradient(135deg, #0a0a2e 0%, #1a0a3e 30%, #0a1a3e 60%, #0a0a2e 100%);
    --gradient-gold: linear-gradient(135deg, #c9a84c, #e8d48b, #c9a84c);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(201, 168, 76, 0.15);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: 'Noto Serif SC', serif;
    line-height: 1.4;
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color 0.3s;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 26, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 0 24px;
}

nav .nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

nav .logo {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.3rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    flex-shrink: 0;
}

nav .nav-links {
    display: flex;
    gap: 6px;
    list-style: none;
    flex-wrap: wrap;
}

nav .nav-links a {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    padding: 4px 10px;
    border-radius: 4px;
    transition: all 0.3s;
    white-space: nowrap;
}

nav .nav-links a:hover {
    color: var(--color-primary-light);
    background: rgba(201, 168, 76, 0.1);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
    padding: 80px 24px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(2px 2px at 20px 30px, rgba(255, 215, 0, 0.6), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255, 255, 255, 0.4), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(255, 215, 0, 0.5), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(2px 2px at 160px 30px, rgba(201, 168, 76, 0.5), transparent),
        radial-gradient(1px 1px at 200px 60px, rgba(255, 255, 255, 0.4), transparent),
        radial-gradient(1.5px 1.5px at 60px 100px, rgba(255, 215, 0, 0.4), transparent),
        radial-gradient(1px 1px at 180px 90px, rgba(255, 255, 255, 0.3), transparent);
    background-size: 200px 100px;
    animation: twinkle 4s ease-in-out infinite alternate;
}

@keyframes twinkle {
    0% { opacity: 0.5; }
    100% { opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 900;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    letter-spacing: 8px;
}

.hero .subtitle {
    font-size: 1.3rem;
    color: var(--color-text-muted);
    font-weight: 300;
    margin-bottom: 32px;
    letter-spacing: 4px;
}

.hero .lead {
    font-size: 1.05rem;
    color: var(--color-text-dim);
    max-width: 600px;
    margin: 0 auto;
    line-height: 2;
}

.hero .scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-text-dim);
    font-size: 0.85rem;
    animation: float 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

.section {
    padding: 80px 0;
    border-bottom: 1px solid var(--color-border);
}

.section:nth-child(even) {
    background: var(--color-bg-section);
}

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

.section-title h2 {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.section-title p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.section-title .divider {
    width: 60px;
    height: 2px;
    background: var(--gradient-gold);
    margin: 16px auto 0;
    border-radius: 1px;
}

.content-block {
    margin-bottom: 40px;
}

.content-block h3 {
    font-size: 1.35rem;
    color: var(--color-primary-light);
    margin-bottom: 16px;
    padding-left: 16px;
    border-left: 3px solid var(--color-primary);
}

.content-block p {
    color: var(--color-text);
    margin-bottom: 14px;
    text-align: justify;
}

.content-block ul, .content-block ol {
    padding-left: 24px;
    margin-bottom: 14px;
}

.content-block li {
    color: var(--color-text);
    margin-bottom: 8px;
}

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

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 28px;
    box-shadow: var(--shadow-card);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.card .card-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.card h4 {
    font-size: 1.15rem;
    color: var(--color-primary-light);
    margin-bottom: 10px;
}

.card p {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    line-height: 1.7;
}

.timeline {
    position: relative;
    padding-left: 40px;
    margin-bottom: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
}

.timeline-item {
    position: relative;
    margin-bottom: 32px;
    padding: 20px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -34px;
    top: 24px;
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 2px solid var(--color-bg);
}

.timeline-item .era {
    font-size: 0.85rem;
    color: var(--color-accent-light);
    font-weight: 500;
    margin-bottom: 6px;
}

.timeline-item h4 {
    font-size: 1.1rem;
    color: var(--color-primary-light);
    margin-bottom: 8px;
}

.timeline-item p {
    color: var(--color-text-muted);
    font-size: 0.92rem;
}

.method-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.method-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 24px;
    position: relative;
    overflow: hidden;
}

.method-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-gold);
}

.method-item .method-icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.method-item h4 {
    font-size: 1.05rem;
    color: var(--color-primary-light);
    margin-bottom: 8px;
}

.method-item p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}

.quote-block {
    background: linear-gradient(135deg, rgba(201, 168, 76, 0.08), rgba(123, 104, 238, 0.08));
    border-left: 4px solid var(--color-primary);
    border-radius: 0 10px 10px 0;
    padding: 24px 28px;
    margin: 28px 0;
}

.quote-block p {
    color: var(--color-text);
    font-style: italic;
    font-size: 1.02rem;
}

.quote-block .source {
    color: var(--color-text-dim);
    font-size: 0.85rem;
    margin-top: 8px;
    font-style: normal;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .two-col {
        grid-template-columns: 1fr;
    }
}

.two-col .col h4 {
    font-size: 1.05rem;
    color: var(--color-primary-light);
    margin-bottom: 10px;
}

.two-col .col p {
    color: var(--color-text-muted);
    font-size: 0.92rem;
}

.highlight-box {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 24px;
    margin: 24px 0;
}

.highlight-box h4 {
    color: var(--color-accent-light);
    margin-bottom: 10px;
}

.highlight-box p, .highlight-box li {
    color: var(--color-text-muted);
    font-size: 0.92rem;
}

.fun-fact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.fun-fact {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
}

.fun-fact .fact-icon {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.fun-fact h4 {
    font-size: 1rem;
    color: var(--color-primary-light);
    margin-bottom: 8px;
}

.fun-fact p {
    color: var(--color-text-muted);
    font-size: 0.88rem;
    line-height: 1.6;
}

footer {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: 40px 24px;
    text-align: center;
}

footer .footer-logo {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

footer p {
    color: var(--color-text-dim);
    font-size: 0.85rem;
    margin-bottom: 6px;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
        letter-spacing: 4px;
    }

    .hero .subtitle {
        font-size: 1rem;
        letter-spacing: 2px;
    }

    .section-title h2 {
        font-size: 1.6rem;
    }

    nav .nav-inner {
        flex-direction: column;
        height: auto;
        padding: 8px 0;
        gap: 4px;
    }

    nav .nav-links {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 2px;
        width: 100%;
        padding: 0 12px;
        scrollbar-width: none;
    }

    nav .nav-links::-webkit-scrollbar {
        display: none;
    }

    nav .nav-links li {
        flex-shrink: 0;
    }

    nav .nav-links a {
        font-size: 0.8rem;
        padding: 4px 8px;
        display: block;
    }

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

    .method-list {
        grid-template-columns: 1fr;
    }

    .fun-fact-grid {
        grid-template-columns: 1fr;
    }
}