/* 全局重置与变量 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: rgba(255,255,255,0.05);
    --bg-glass: rgba(255,255,255,0.08);
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0c0;
    --accent-gold: #ffd700;
    --accent-blue: #4a90d9;
    --accent-purple: #7c5cbf;
    --shadow-soft: 0 8px 32px rgba(0,0,0,0.3);
    --radius-card: 16px;
    --radius-btn: 30px;
    --transition: 0.3s ease;
    --nav-height: 70px;
    --gradient-banner: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #2a1a3e 100%);
    --gradient-gold: linear-gradient(135deg, #ffd700, #f0a500);
    --gradient-btn: linear-gradient(135deg, #ffd700, #e6b800);
    --gradient-title: linear-gradient(135deg, #ffd700, #f0a500);
    --gradient-banner-text: linear-gradient(135deg, #ffd700, #ffaa00, #ffd700);
}
.dark-mode {
    --bg-primary: #f5f5fa;
    --bg-secondary: #ffffff;
    --bg-card: rgba(0,0,0,0.03);
    --bg-glass: rgba(255,255,255,0.7);
    --text-primary: #1a1a2e;
    --text-secondary: #555;
    --shadow-soft: 0 8px 32px rgba(0,0,0,0.1);
    --gradient-banner: linear-gradient(135deg, #e8e8f0 0%, #f5f5fa 50%, #ede4f5 100%);
}
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background 0.4s, color 0.4s;
    overflow-x: hidden;
}
a { color: var(--accent-gold); text-decoration: none; transition: color 0.3s; }
a:hover { color: #e6c200; }
img { display: block; max-width: 100%; height: auto; }
ul { list-style: none; }
/* 导航 */
header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(15,15,26,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: background 0.4s, box-shadow 0.3s;
    height: var(--nav-height);
}
.dark-mode header {
    background: rgba(255,255,255,0.85);
    border-bottom: 1px solid rgba(0,0,0,0.06);
}
.header-inner {
    max-width: 1280px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
    height: 100%;
}
.logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 24px; font-weight: 800;
    color: var(--accent-gold);
}
.logo svg { width: 40px; height: 40px; }
nav { display: flex; align-items: center; gap: 28px; }
nav a {
    color: var(--text-secondary); font-size: 15px; font-weight: 500;
    position: relative; padding: 4px 0;
    transition: color 0.3s;
}
nav a:hover, nav a.active { color: var(--accent-gold); }
nav a::after {
    content: ''; position: absolute; bottom: -2px; left: 0;
    width: 0; height: 2px; background: var(--accent-gold);
    transition: width 0.3s;
}
nav a:hover::after, nav a.active::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.theme-toggle, .search-toggle, .menu-toggle {
    background: none; border: none; color: var(--text-secondary);
    font-size: 20px; cursor: pointer; padding: 6px;
    border-radius: 50%; transition: background 0.3s, color 0.3s;
    display: flex; align-items: center; justify-content: center;
}
.theme-toggle:hover, .search-toggle:hover, .menu-toggle:hover {
    background: var(--bg-glass); color: var(--accent-gold);
}
.menu-toggle { display: none; }
/* 移动端菜单 */
.mobile-menu {
    position: fixed; top: var(--nav-height); left: 0; right: 0;
    background: rgba(15,15,26,0.98);
    backdrop-filter: blur(20px);
    padding: 20px 24px;
    display: none;
    flex-direction: column;
    gap: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    z-index: 999;
}
.dark-mode .mobile-menu { background: rgba(255,255,255,0.98); }
.mobile-menu.open { display: flex; }
.mobile-menu a {
    color: var(--text-secondary); font-size: 18px; padding: 8px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.mobile-menu a:hover { color: var(--accent-gold); }
/* 搜索面板 */
.search-panel {
    position: fixed; top: var(--nav-height); left: 0; right: 0;
    background: rgba(15,15,26,0.95);
    backdrop-filter: blur(20px);
    padding: 20px 24px;
    display: none;
    z-index: 999;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.dark-mode .search-panel { background: rgba(255,255,255,0.95); }
.search-panel.open { display: block; }
.search-panel input {
    width: 100%; padding: 14px 20px;
    border: 2px solid rgba(255,215,0,0.3);
    border-radius: 50px;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
    transition: border 0.3s;
}
.search-panel input:focus { border-color: var(--accent-gold); }
.search-panel .search-results {
    margin-top: 16px; max-height: 300px; overflow-y: auto;
}
.search-panel .search-results div {
    padding: 10px 16px; border-radius: 8px;
    background: var(--bg-glass); margin-bottom: 6px;
    cursor: pointer; transition: background 0.3s;
}
.search-panel .search-results div:hover { background: rgba(255,215,0,0.1); }
/* 主要布局 */
main { margin-top: var(--nav-height); }
section { padding: 80px 24px; }
.container { max-width: 1280px; margin: 0 auto; }
.section-title {
    font-size: 36px; font-weight: 800; margin-bottom: 16px;
    background: var(--gradient-title);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-subtitle {
    font-size: 18px; color: var(--text-secondary);
    max-width: 600px; margin-bottom: 48px;
}
/* Banner */
.banner {
    position: relative; min-height: 85vh;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
    background: var(--gradient-banner);
}
.banner-slide {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; transition: opacity 1s ease;
}
.banner-slide.active { opacity: 1; }
.banner-content {
    text-align: center; padding: 40px 24px; z-index: 2;
    max-width: 800px;
}
.banner-content h1 {
    font-size: 56px; font-weight: 900; margin-bottom: 20px;
    background: var(--gradient-banner-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}
.banner-content p {
    font-size: 20px; color: var(--text-secondary);
    margin-bottom: 32px; max-width: 600px; margin-left: auto; margin-right: auto;
}
.banner-btn {
    display: inline-block; padding: 16px 48px;
    background: var(--gradient-btn);
    color: #1a1a2e; font-weight: 700; font-size: 18px;
    border-radius: var(--radius-btn);
    box-shadow: 0 8px 30px rgba(255,215,0,0.3);
    transition: transform 0.3s, box-shadow 0.3s;
    border: none; cursor: pointer;
}
.banner-btn:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(255,215,0,0.4); }
.banner-dots {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 12px; z-index: 5;
}
.banner-dots span {
    width: 14px; height: 14px; border-radius: 50%;
    background: rgba(255,255,255,0.2); cursor: pointer;
    transition: background 0.3s, transform 0.3s;
}
.banner-dots span.active { background: var(--accent-gold); transform: scale(1.3); }
/* 玻璃卡片 */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-card);
    padding: 32px;
    box-shadow: var(--shadow-soft);
    transition: transform 0.4s, box-shadow 0.4s;
}
.glass-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.4);
}
.dark-mode .glass-card {
    border: 1px solid rgba(0,0,0,0.06);
    background: rgba(255,255,255,0.7);
}
/* 网格 */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 32px; }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 24px; }
/* 数字动画 */
.stat-number {
    font-size: 48px; font-weight: 900;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
/* FAQ */
.faq-item {
    background: var(--bg-glass);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.05);
}
.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}
.faq-question:hover { background: rgba(255,215,0,0.05); }
.faq-question::after {
    content: '+'; font-size: 24px; font-weight: 300;
    transition: transform 0.3s;
}
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer {
    max-height: 0; overflow: hidden;
    padding: 0 24px;
    transition: max-height 0.4s ease, padding 0.4s ease;
    color: var(--text-secondary);
}
.faq-item.open .faq-answer {
    max-height: 600px; padding: 0 24px 20px;
}
/* HowTo */
.howto-step {
    display: flex; gap: 20px; margin-bottom: 24px;
    align-items: flex-start;
}
.howto-step .step-num {
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--accent-gold); color: #1a1a2e;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; flex-shrink: 0;
}
/* 文章卡片 */
.article-card {
    background: var(--bg-glass);
    border-radius: var(--radius-card);
    padding: 24px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: transform 0.3s;
}
.article-card:hover { transform: translateY(-4px); }
.article-card h3 { font-size: 20px; margin-bottom: 8px; }
.article-card .date { font-size: 13px; color: var(--text-secondary); margin-bottom: 12px; }
.article-card p { color: var(--text-secondary); font-size: 15px; margin-bottom: 16px; }
.article-card .read-more {
    color: var(--accent-gold); font-weight: 600;
    cursor: pointer; display: inline-block;
}
/* 合作伙伴 */
.partner-grid {
    display: flex; flex-wrap: wrap; gap: 24px; justify-content: center;
}
.partner-item {
    width: 120px; height: 60px;
    background: var(--bg-glass);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 600; color: var(--text-secondary);
    border: 1px solid rgba(255,255,255,0.05);
    transition: all 0.3s;
}
.partner-item:hover { border-color: var(--accent-gold); color: var(--accent-gold); }
/* 页脚 */
footer {
    background: var(--bg-secondary);
    padding: 60px 24px 30px;
    border-top: 1px solid rgba(255,255,255,0.05);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    max-width: 1280px;
    margin: 0 auto;
}
.footer-grid h4 { color: var(--accent-gold); margin-bottom: 16px; font-size: 18px; }
.footer-grid a { display: block; color: var(--text-secondary); margin-bottom: 8px; font-size: 14px; }
.footer-grid a:hover { color: var(--accent-gold); }
.footer-bottom {
    max-width: 1280px; margin: 40px auto 0;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.05);
    display: flex; justify-content: space-between; flex-wrap: wrap;
    gap: 16px; font-size: 13px; color: var(--text-secondary);
}
/* 返回顶部 */
.back-top {
    position: fixed; bottom: 40px; right: 40px;
    width: 50px; height: 50px; border-radius: 50%;
    background: var(--accent-gold); color: #1a1a2e;
    border: none; font-size: 24px; cursor: pointer;
    box-shadow: 0 4px 20px rgba(255,215,0,0.3);
    display: none; align-items: center; justify-content: center;
    z-index: 999; transition: transform 0.3s;
}
.back-top.show { display: flex; }
.back-top:hover { transform: scale(1.1); }
/* 滚动动画 */
.fade-up {
    opacity: 0; transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible {
    opacity: 1; transform: translateY(0);
}
/* 响应式 */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    nav { display: none; }
    .menu-toggle { display: flex; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .banner-content h1 { font-size: 36px; }
    .section-title { font-size: 28px; }
    .footer-grid { grid-template-columns: 1fr; }
    .back-top { bottom: 20px; right: 20px; width: 44px; height: 44px; }
    section { padding: 48px 16px; }
}
@media (max-width: 480px) {
    .banner-content h1 { font-size: 28px; }
    .stat-number { font-size: 36px; }
}
/* 暗黑模式过渡 */
.dark-mode .glass-card { background: rgba(255,255,255,0.5); }
/* 自定义滚动条 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-gold); border-radius: 4px; }