:root {
    /* 背景色 */
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-tertiary: #1a1a3e;

    /* 强调色 */
    --accent-primary: #00d9ff;
    --accent-secondary: #7b2cbf;
    --accent-tertiary: #f72585;

    /* 文字色 */
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;

    /* 渐变 */
    --gradient-main: linear-gradient(135deg, #00d9ff 0%, #7b2cbf 50%, #f72585 100%);

    /* 阴影 */
    --glow-sm: 0 0 10px rgba(0, 217, 255, 0.3);
    --glow-md: 0 0 20px rgba(0, 217, 255, 0.5);
    --glow-lg: 0 0 30px rgba(0, 217, 255, 0.6);
    --glow-xl: 0 10px 40px rgba(0, 217, 255, 0.4);

    /* 圆角 */
    --radius-sm: 5px;
    --radius-md: 15px;
    --radius-lg: 20px;
    --radius-xl: 30px;

    /* 间距 */
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.6s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { border: none; background: none; cursor: pointer; color: inherit; font: inherit; }

/* 背景动画容器 */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

/* 旋转渐变背景 */
.bg-animation::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(circle at 20% 80%, rgba(0, 217, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(123, 44, 191, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(247, 37, 133, 0.1) 0%, transparent 50%);
    animation: bgRotate 30s linear infinite;
}

@keyframes bgRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 粒子效果 */
.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle, var(--accent-primary) 1px, transparent 1px),
        radial-gradient(circle, var(--accent-secondary) 1px, transparent 1px);
    background-size: 50px 50px, 80px 80px;
    background-position: 0 0, 25px 25px;
    opacity: 0.3;
    animation: particlesFloat 20s ease-in-out infinite;
}

@keyframes particlesFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(10, 10, 26, 0.8);
    border-bottom: 1px solid rgba(0, 217, 255, 0.1);
}

.navbar .logo {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(0, 217, 255, 0.5);
}

.navbar .nav-links {
    display: flex;
    gap: 40px;
}

.navbar .nav-links a {
    color: var(--text-secondary);
    transition: color var(--transition-base);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.navbar .lang-switch {
    display: flex;
    gap: 10px;
}

.navbar .lang-btn {
    padding: 8px 16px;
    border: 1px solid rgba(0, 217, 255, 0.3);
    background: transparent;
    color: var(--text-secondary);
    border-radius: 20px;
    transition: all var(--transition-base);
    font-size: 12px;
}

.navbar .lang-btn.active,
.navbar .lang-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    box-shadow: var(--glow-sm);
}

/* 移动端响应式 */
@media (max-width: 768px) {
    .navbar { padding: 15px 20px; }
    .navbar .nav-links { display: none; }
}

/* Hero 板块 */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 20px 60px;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 217, 255, 0.2) 0%, transparent 70%);
    filter: blur(60px);
    z-index: -1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    border: 1px solid var(--accent-primary);
    border-radius: 30px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-primary);
    margin-bottom: 30px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: var(--glow-sm); }
    50% { box-shadow: var(--glow-md); }
}

.hero h1 {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 30px;
    background: linear-gradient(135deg, #ffffff 0%, #a0a0c0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero h1 .highlight {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(18px, 3vw, 24px);
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 50px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

/* 按钮 */
.btn {
    padding: 16px 40px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    transition: all var(--transition-base);
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-main);
    color: white;
    box-shadow: var(--glow-xl);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(0, 217, 255, 0.6);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background: rgba(0, 217, 255, 0.1);
    box-shadow: 0 5px 20px rgba(0, 217, 255, 0.3);
}

/* 统计板块 */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
}

.stat-card {
    text-align: center;
    padding: 40px 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(0, 217, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: var(--glow-xl);
}

.stat-value {
    font-size: 48px;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 通用板块样式 */
section {
    padding: 100px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    border: 1px solid var(--accent-secondary);
    border-radius: 30px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-secondary);
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 700;
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 功能卡片网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 40px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(123, 44, 191, 0.2);
    border-radius: 20px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-main);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-secondary);
    box-shadow: 0 10px 40px rgba(123, 44, 191, 0.2);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-desc {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 时间轴趋势 */
.trend-timeline {
    position: relative;
    padding-left: 50px;
}

.trend-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary), var(--accent-tertiary));
}

.trend-item {
    position: relative;
    margin-bottom: 60px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(0, 217, 255, 0.1);
    border-radius: 15px;
}

.trend-item::before {
    content: '';
    position: absolute;
    left: -38px;
    top: 40px;
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent-primary);
}

.trend-year {
    display: inline-block;
    padding: 5px 15px;
    background: var(--accent-primary);
    color: var(--bg-primary);
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 15px;
}

.trend-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 10px;
}

.trend-desc {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 知识网格 */
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.knowledge-card {
    padding: 30px;
    background: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0.01) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    transition: all var(--transition-base);
}

.knowledge-card:hover {
    border-color: var(--accent-tertiary);
    box-shadow: 0 5px 30px rgba(247, 37, 133, 0.2);
}

.knowledge-term {
    font-size: 20px;
    font-weight: 600;
    color: var(--accent-tertiary);
    margin-bottom: 10px;
}

.knowledge-def {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* 玻璃态卡片 */
.glass-card {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* CTA 板块 */
.cta-section {
    text-align: center;
    padding: 120px 20px;
    background: radial-gradient(circle at center, rgba(0, 217, 255, 0.1) 0%, transparent 70%);
    margin-top: 100px;
}

.cta-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-desc {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* 页脚 */
footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 60px 20px 40px;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--accent-primary);
    margin-bottom: 20px;
    font-size: 16px;
}

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

.footer-section a {
    color: var(--text-secondary);
    transition: color var(--transition-base);
    font-size: 14px;
}

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

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-bottom a {
    margin: 0 10px;
}