/* 24直播网 - 核心样式表 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-dark: #121212;
    --bg-card: #1e1e1e;
    --gold-primary: #D4AF37;
    --gold-hover: #F1C40F;
    --text-main: #E0E0E0;
    --text-muted: #A0A0A0;
    --border-gold: rgba(212, 175, 55, 0.3);
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(18, 18, 18, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-gold);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gold-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

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

.nav-links a.active {
    color: var(--gold-primary);
    border-bottom: 2px solid var(--gold-primary);
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 2rem 4rem;
}

/* 标题样式 */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--gold-primary);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gold-primary);
}

/* 卡片基类 */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--gold-primary);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* 底部 */
footer {
    background: #0a0a0a;
    padding: 4rem 5% 2rem;
    border-top: 1px solid var(--border-gold);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .section-title h2 {
        font-size: 2rem;
    }
}

/* 动画类 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-smooth);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 工具类 */
.btn-gold {
    background: var(--gold-primary);
    color: #000;
    padding: 0.8rem 2rem;
    border-radius: 30px;
    font-weight: 600;
    display: inline-block;
}

.btn-gold:hover {
    background: var(--gold-hover);
    transform: scale(1.05);
}