/* 全局重置与品牌色 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --primary: #1a1a2e;
    --secondary: #f0c040;
    --accent: #e74c3c;
    --bg: #f5f5fa;
    --text: #2c3e50;
    --card-bg: rgba(255,255,255,0.7);
    --glass: rgba(255,255,255,0.2);
    --shadow: 0 8px 32px rgba(0,0,0,0.1);
    --radius: 16px;
    --transition: 0.3s ease;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    scroll-behavior: smooth;
}
/* 暗黑模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #0d0d1a;
        --secondary: #f0c040;
        --accent: #e74c3c;
        --bg: #12121e;
        --text: #e0e0e0;
        --card-bg: rgba(30,30,50,0.8);
        --glass: rgba(0,0,0,0.3);
        --shadow: 0 8px 32px rgba(0,0,0,0.5);
    }
}
body.dark {
    --primary: #0d0d1a;
    --secondary: #f0c040;
    --accent: #e74c3c;
    --bg: #12121e;
    --text: #e0e0e0;
    --card-bg: rgba(30,30,50,0.8);
    --glass: rgba(0,0,0,0.3);
    --shadow: 0 8px 32px rgba(0,0,0,0.5);
}
/* 通用样式 */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
a { color: var(--secondary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
.section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 40px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
h1, h2, h3 { color: var(--primary); margin-bottom: 20px; }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; border-left: 6px solid var(--secondary); padding-left: 16px; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 16px; }
ul, ol { margin-left: 24px; margin-bottom: 16px; }
.btn {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--secondary), #d4a017);
    color: var(--primary);
    border-radius: 50px;
    font-weight: bold;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(240,192,64,0.4);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(240,192,64,0.6); color: var(--primary); }
/* Header */
header {
    background: var(--primary);
    padding: 16px 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--secondary);
    font-size: 1.8rem;
    font-weight: bold;
}
.logo svg { width: 48px; height: 48px; }
nav ul {
    display: flex;
    gap: 24px;
    list-style: none;
    margin: 0;
}
nav a { color: #fff; font-weight: 500; padding: 8px 0; border-bottom: 2px solid transparent; }
nav a:hover { border-bottom-color: var(--secondary); color: var(--secondary); }
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { width: 28px; height: 3px; background: #fff; border-radius: 3px; transition: var(--transition); }
/* 移动菜单 */
@media (max-width: 768px) {
    .menu-toggle { display: flex; }
    nav ul { display: none; flex-direction: column; background: var(--primary); position: absolute; top: 100%; left: 0; right: 0; padding: 20px; gap: 16px; }
    nav ul.open { display: flex; }
}
/* Hero 轮播 */
.hero {
    position: relative;
    overflow: hidden;
    min-height: 500px;
    background: linear-gradient(135deg, var(--primary), #2c3e50);
    display: flex;
    align-items: center;
    justify-content: center;
}
.carousel { position: relative; width: 100%; max-width: 1200px; margin: 0 auto; }
.carousel-slide { display: none; padding: 60px 20px; text-align: center; color: #fff; }
.carousel-slide.active { display: block; animation: fadeIn 0.6s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.carousel-slide h1, .carousel-slide h2 { color: #fff; font-size: 2.8rem; margin-bottom: 20px; }
.carousel-slide p { font-size: 1.2rem; margin-bottom: 30px; }
.carousel-prev, .carousel-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.5);
    color: #fff;
    border: none;
    font-size: 2rem;
    padding: 12px 20px;
    cursor: pointer;
    border-radius: 50%;
    transition: var(--transition);
    z-index: 10;
}
.carousel-prev { left: 20px; }
.carousel-next { right: 20px; }
.carousel-prev:hover, .carousel-next:hover { background: var(--secondary); color: var(--primary); }
/* 卡片布局 */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.1);
}
.card:hover { transform: translateY(-8px); box-shadow: 0 16px 40px rgba(0,0,0,0.15); }
.card svg { margin-bottom: 16px; }
/* 数据统计 */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; text-align: center; }
.stat-item { background: var(--card-bg); backdrop-filter: blur(10px); padding: 30px; border-radius: var(--radius); box-shadow: var(--shadow); }
.stat-number { font-size: 3rem; font-weight: bold; color: var(--secondary); }
/* FAQ */
.faq-item { border-bottom: 1px solid rgba(0,0,0,0.1); padding: 16px 0; }
.faq-question { background: none; border: none; width: 100%; text-align: left; font-size: 1.1rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; color: var(--text); padding: 8px 0; }
.faq-question:hover { color: var(--secondary); }
.faq-icon { font-size: 1.5rem; transition: var(--transition); }
.faq-question[aria-expanded="true"] .faq-icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; padding: 0 16px; }
.faq-question[aria-expanded="true"] + .faq-answer { max-height: 300px; padding: 16px; }
/* 搜索 */
.search-form { display: flex; gap: 12px; max-width: 500px; margin: 20px auto; }
.search-form input { flex: 1; padding: 12px 16px; border: 2px solid var(--primary); border-radius: 50px; font-size: 1rem; background: var(--card-bg); color: var(--text); }
.search-form button { padding: 12px 24px; background: var(--secondary); color: var(--primary); border: none; border-radius: 50px; cursor: pointer; font-weight: bold; transition: var(--transition); }
.search-form button:hover { background: #d4a017; }
/* 面包屑 */
.breadcrumb { max-width: 1200px; margin: 20px auto; padding: 0 20px; }
.breadcrumb ol { list-style: none; display: flex; gap: 8px; }
.breadcrumb li::after { content: " / "; margin-left: 8px; }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--text); }
/* 返回顶部 */
#back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    background: var(--secondary);
    color: var(--primary);
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    font-size: 1.8rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    z-index: 999;
    display: none;
}
#back-to-top.show { display: block; }
#back-to-top:hover { transform: scale(1.1); background: #d4a017; }
/* Footer */
footer {
    background: var(--primary);
    color: #ccc;
    padding: 40px 20px;
    text-align: center;
}
.footer-content { max-width: 1200px; margin: 0 auto; }
.footer-links a { color: var(--secondary); margin: 0 8px; }
.footer-links a:hover { color: #fff; }
/* 响应式 */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }
    .carousel-slide h1, .carousel-slide h2 { font-size: 2rem; }
    .card-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
    .section { padding: 30px 16px; }
    .stats-grid { grid-template-columns: 1fr; }
}
/* 滚动动画 */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }