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

:root {
    --primary: #00d4ff;
    --secondary: #7c3aed;
    --accent: #f472b6;
    --bg-dark: #0a0e1a;
    --bg-card: rgba(255, 255, 255, 0.05);
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
}

/* 粒子背景画布 */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

/* 通用容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
    position: relative;
    z-index: 1;
}

section {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: glow 3s ease-in-out infinite alternate;
}

@keyframes glow {
    from { filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.3)); }
    to { filter: drop-shadow(0 0 40px rgba(124, 58, 237, 0.5)); }
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.cta-btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 10px 30px rgba(124, 58, 237, 0.3);
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(124, 58, 237, 0.5);
}

/* 数据统计区 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform 0.3s, border-color 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

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

/* 发展时间线 */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item:nth-child(odd) {
    justify-content: flex-start;
}

.timeline-item:nth-child(even) {
    justify-content: flex-end;
}

.timeline-content {
    width: 45%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.8rem;
    backdrop-filter: blur(10px);
    position: relative;
    transition: border-color 0.3s;
}

.timeline-content:hover {
    border-color: var(--primary);
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--primary);
    z-index: 2;
}

.timeline-year {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

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

/* 技术应用卡片 */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.tech-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.2rem;
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(30px);
}

.tech-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.tech-card:hover {
    transform: translateY(-8px);
    border-color: var(--secondary);
    box-shadow: 0 20px 40px rgba(124, 58, 237, 0.2);
}

.tech-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.tech-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
}

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

/* 未来展望 */
.future-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.future-card {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(124, 58, 237, 0.1));
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: scale(0.95);
    transition: all 0.6s ease;
}

.future-card.visible {
    opacity: 1;
    transform: scale(1);
}

.future-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.3), transparent);
    border-radius: 50%;
}

.future-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    position: relative;
}

.future-card p {
    color: var(--text-muted);
    position: relative;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        justify-content: flex-start !important;
        padding-left: 50px;
    }

    .timeline-content {
        width: 100%;
    }

    .timeline-dot {
        left: 20px;
    }

    .section-title h2 {
        font-size: 2rem;
    }
}