/* ============================================================
   shared.css — 河南科技大学新生入学指南 2025 公共样式
   设计：现代极简 · 大面积留白 · 黑白灰+深蓝强调色
   ============================================================ */

/* --- 变量 --- */
:root {
    --white: #ffffff;
    --bg: #fafaf9;
    --bg-alt: #f3f3f1;
    --black: #111111;
    --text: #1a1a1a;
    --text-secondary: #555555;
    --text-muted: #999999;
    --border: #e5e4e1;
    --border-light: #f0efec;
    --accent: #1a2744;
    --accent-light: #2d3f5e;
    --gold: #c4943c;
    --gold-light: #f5ecd7;
    --shadow: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --radius: 8px;
    --radius-lg: 14px;
    --transition: 0.2s ease;
    --max-width: 1120px;
}

/* --- 重置 --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.8;
    font-size: 16px;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--gold); }

img { max-width: 100%; display: block; }

/* --- 容器 --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 28px;
}

.container-narrow { max-width: 800px; }

/* --- 页面区块 --- */
.page-section { padding: 80px 0; }
.page-section.alt { background: var(--bg-alt); }
.page-section.sm { padding: 48px 0; }

/* --- 区块标题 --- */
.section-label {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: block;
}

.section-heading {
    font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--black);
    letter-spacing: -0.5px;
    margin-bottom: 40px;
}

.section-heading-sm {
    font-family: "Noto Serif SC", Georgia, serif;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--black);
    margin-bottom: 24px;
}

/* --- 顶部导航 --- */
.top-bar {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.top-bar-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 28px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.top-bar-home {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--black);
    letter-spacing: 0.5px;
}

.top-bar-home .home-icon {
    width: 32px; height: 32px;
    border-radius: 6px;
    background: var(--accent);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 0.85rem;
}

.top-bar-home .home-icon.gold { background: var(--gold); }

/* --- 学姐微信入口 --- */
.wechat-entry {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 6px 14px;
    border-radius: 50px;
    background: var(--gold-light);
    border: 1.5px solid transparent;
    cursor: default;
    transition: var(--transition);
    white-space: nowrap;
    font-size: 0.82rem;
}

.wechat-entry:hover {
    background: var(--gold);
    border-color: var(--gold);
}

.wechat-entry svg { color: #2dc100; flex-shrink: 0; transition: var(--transition); }
.wechat-entry .wl { color: var(--text-secondary); font-weight: 500; transition: var(--transition); }
.wechat-entry .wid { font-weight: 700; color: var(--gold); transition: var(--transition); }

.wechat-entry:hover svg,
.wechat-entry:hover .wl,
.wechat-entry:hover .wid { color: #fff; }

/* --- 汉堡菜单按钮 --- */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px; height: 36px;
    padding: 6px;
    border: none;
    background: transparent;
    cursor: pointer;
    z-index: 110;
    position: relative;
}

.hamburger-btn span {
    display: block;
    width: 100%; height: 2px;
    background: var(--black);
    border-radius: 2px;
    transition: all 0.25s ease;
}

.hamburger-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-btn.open span:nth-child(2) { opacity: 0; }
.hamburger-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- 移动端导航菜单 --- */
.mobile-nav {
    display: none;
    position: fixed;
    top: 60px;
    left: 0; right: 0; bottom: 0;
    background: var(--white);
    z-index: 99;
    padding: 20px 0;
    overflow-y: auto;
}

.mobile-nav.open { display: block; }

.mobile-nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 28px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-nav a {
    display: block;
    padding: 14px 20px;
    border-radius: var(--radius);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    border: 1px solid var(--border-light);
    background: var(--white);
    transition: var(--transition);
}

.mobile-nav a:hover { background: var(--bg-alt); border-color: var(--accent); }

.mobile-nav .mobile-wechat {
    margin-top: 16px;
    padding: 14px 20px;
    background: var(--gold-light);
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--text-secondary);
    border: 1px solid #e8d5a0;
}

.mobile-nav .mobile-wechat strong { color: var(--accent); }

/* --- 卡片 --- */
.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--accent-light);
}

.card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; color: var(--black); }
.card h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; color: var(--black); }
.card p  { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

.card-grid { display: grid; gap: 20px; }
.card-grid.two   { grid-template-columns: 1fr 1fr; }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }

/* --- 信息列表 --- */
.info-list { list-style: none; }
.info-list li {
    padding: 5px 0 5px 16px;
    position: relative;
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.info-list li::before {
    content: '';
    position: absolute;
    left: 0; top: 12px;
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--gold);
}
.info-list li strong { color: var(--text); }

/* --- 提示框 --- */
.tip {
    margin-top: 12px;
    padding: 10px 16px;
    border-radius: 6px;
    font-size: 0.84rem;
    font-weight: 500;
    line-height: 1.6;
}
.tip-warn  { background: #fdf6ed; border-left: 3px solid var(--gold); color: #8a6d20; }
.tip-info  { background: #eef4fa; border-left: 3px solid var(--accent-light); color: #2a5885; }

/* --- 高亮框 --- */
.highlight-box {
    margin-top: 24px;
    padding: 20px 24px;
    background: var(--gold-light);
    border: 1px solid #e8d5a0;
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    line-height: 1.7;
}
.highlight-box strong { color: var(--accent); }

/* --- 标签 --- */
.tag-group { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.tag {
    padding: 4px 12px;
    border-radius: 50px;
    background: var(--bg-alt);
    color: var(--accent-light);
    font-size: 0.78rem;
    font-weight: 500;
}

/* --- 页脚 --- */
.page-footer {
    background: var(--black);
    color: rgba(255,255,255,0.6);
    padding: 40px 0;
    text-align: center;
    font-size: 0.85rem;
}
.page-footer strong { color: #fff; }
.page-footer .footer-brand { margin-bottom: 8px; }

/* --- 返回首页链接 --- */
.back-home {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent);
    padding: 8px 16px;
    border-radius: 50px;
    background: var(--bg-alt);
    margin-bottom: 32px;
    transition: var(--transition);
}
.back-home:hover { background: var(--accent); color: #fff; }

/* --- 响应式 --- */
@media (max-width: 768px) {
    .page-section { padding: 48px 0; }
    .page-section.sm { padding: 32px 0; }
    .section-heading { font-size: 1.4rem; margin-bottom: 28px; }
    .section-heading-sm { font-size: 1.15rem; }
    .section-label { font-size: 0.74rem; }
    .card-grid.two,
    .card-grid.three { grid-template-columns: 1fr; }
    .container { padding: 0 20px; }
    .container-narrow { max-width: 100%; }
    .top-bar-inner { padding: 0 20px; height: 52px; }
    .top-bar { position: sticky; }
    .wechat-entry { padding: 5px 10px; font-size: 0.75rem; }
    .wechat-entry .wl { display: none; }
    .hamburger-btn { display: flex; }
    .top-bar-home { font-size: 0.88rem; }
    .card { padding: 20px; }
    .back-home { font-size: 0.82rem; padding: 6px 14px; margin-bottom: 24px; }
    .highlight-box { padding: 16px 18px; font-size: 0.85rem; }
    .page-footer { padding: 28px 0; font-size: 0.8rem; }
    body { font-size: 15px; }
    .mobile-nav-inner { padding: 0 20px; }
}

@media (max-width: 480px) {
    .page-section { padding: 36px 0; }
    .page-section.sm { padding: 24px 0; }
    .section-heading { font-size: 1.25rem; margin-bottom: 20px; }
    .section-heading-sm { font-size: 1.05rem; }
    .section-label { font-size: 0.7rem; letter-spacing: 1px; }
    .container { padding: 0 16px; }
    .top-bar-inner { padding: 0 16px; height: 48px; }
    .card { padding: 16px; border-radius: var(--radius); }
    .card h3 { font-size: 1rem; }
    .card h4 { font-size: 0.88rem; }
    .card p { font-size: 0.84rem; }
    .info-list li { font-size: 0.84rem; padding: 4px 0 4px 14px; }
    .info-list li::before { top: 10px; width: 4px; height: 4px; }
    .tag { font-size: 0.72rem; padding: 3px 10px; }
    .highlight-box { padding: 14px 16px; font-size: 0.82rem; }
    .back-home { font-size: 0.78rem; padding: 5px 12px; }
    .page-footer { padding: 24px 0; font-size: 0.78rem; }
    body { font-size: 14px; }
    .top-bar-home { font-size: 0.82rem; }
    .top-bar-home .home-icon { width: 28px; height: 28px; font-size: 0.75rem; }
    .mobile-nav { top: 48px; }
    .mobile-nav-inner { padding: 0 16px; }
    .mobile-nav a { padding: 12px 16px; font-size: 0.95rem; }
    .tip { font-size: 0.78rem; padding: 8px 14px; }
    .tag-group { gap: 6px; }
}