:root {
    --bg-color: #1e293b;
    --card-bg: #f8fafc;
    --text-color: #334155;
    --accent-color: #dc2626;
    --nav-active: #3b82f6;
    --radius: 4px;
    --shadow: 0 6px 16px rgba(0,0,0,0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Inter","Microsoft YaHei",sans-serif;
}

body {
    background: var(--bg-color);
    color: var(--card-bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 顶部导航 ===== */
header {
    background: rgba(0,0,0,0.70);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 999;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* 搜索框 */
.search-box input {
    padding: 6px 14px;
    border-radius: 20px;
    border: none;
    outline: none;
    width: 300px;
    font-size: 16px;
}

/* 导航 */
.nav-links {
    display: flex;
    list-style: none;
    gap: 15px;
}

.nav-links a {
    color: #e5e7eb;
    text-decoration: none;
    padding: 6px 12px;
    border-radius: var(--radius);
}

.nav-links a:hover,
.nav-links a.active {
    background: rgba(59,130,246,0.25);
    color: var(--nav-active);
}

/* 汉堡 */
.hamburger {
    display: none;
    cursor: pointer;
    font-size: 24px;
    color: #fff;
}

/* ===== 公告 ===== */
.notice {
    background: #334155;
    padding: 10px 0 10PX 10PX;
    overflow: hidden;
    font-size: 14px;
}

.marquee {
    white-space: nowrap;
    animation: scroll 60s linear infinite;
}

@keyframes scroll {
    0% { transform: translateX(100%); }
    100% { transform: translateX(-100%); }
}

/* ===== Hero ===== */
.hero {
    text-align: center;
    padding: 40px 0 20px;
}

.logo-box {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.hero p {
    color: #94a3b8;
    margin-top: 0px;
    font-size: 35px;
    color: #fff;
}

/* ===== 卡片 ===== */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
    gap: 25px;
    padding-bottom: 40px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    color: var(--text-color);
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    margin-bottom: 10px;
}

.card p {
    font-size: 16px;
    margin-bottom: 15px;
    color: #475569;
}

.card ul {
    list-style: none;
}

.card ul li {
    margin-bottom: 8px;
}

.card ul li a {
    color: var(--accent-color);
    text-decoration: none;
}

.card ul li a:hover {
    text-decoration: underline;
}

/* 隐藏卡片 */
.hidden {
    display: none !important;
}

/* ===== 友情链接 ===== */
.friends {
    padding: 20px 0;
    text-align: center;
}

.friends h4 {
    margin-bottom: 10px;
    color: #cbd5e1;
}

.friends a {
    color: #94a3b8;
    margin: 0 10px;
    font-size: 14px;
    text-decoration: none;
}

.friends a:hover {
    color: #fff;
}

/* ===== 页脚 ===== */
footer {
    text-align: center;
    padding: 20px 0;
    color: #64748b;
    font-size: 14px;
}

/* ===== 手机端 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        background: #020617;
        position: absolute;
        top: 60px;
        right: 20px;
        padding: 15px;
        border-radius: var(--radius);
    }

    .nav-links.show {
        display: flex;
    }

    .hamburger {
        display: block;
    }

    .search-box {
        display: none;
    }
}