/* =============================================
   校花传媒 - 原创样式系统 v1.0
   Brand: 校花 | Domain: xvreqq.cn
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --primary: #D4437C;
  --primary-dark: #A8305D;
  --secondary: #6B2FA0;
  --accent: #FFB347;
  --gradient: linear-gradient(135deg, #D4437C 0%, #6B2FA0 100%);
  --gradient-soft: linear-gradient(135deg, rgba(212,67,124,0.08) 0%, rgba(107,47,160,0.08) 100%);
  --dark: #1C1028;
  --dark-2: #2A1A3E;
  --text: #3D2B52;
  --text-light: #7A6690;
  --bg: #FDFAFF;
  --bg-card: #FFFFFF;
  --border: #EDE0F5;
  --shadow: 0 4px 24px rgba(107,47,160,0.10);
  --shadow-hover: 0 12px 40px rgba(212,67,124,0.20);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- 重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif; background: var(--bg); color: var(--text); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---- 布局 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-alt { background: var(--gradient-soft); }

/* ---- 通用标题 ---- */
.section-tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 2px; color: var(--primary); background: rgba(212,67,124,0.10); padding: 4px 14px; border-radius: 20px; margin-bottom: 14px; text-transform: uppercase; }
.section-title { font-size: clamp(26px, 4vw, 40px); font-weight: 900; color: var(--dark); margin-bottom: 16px; line-height: 1.25; }
.section-title span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.section-desc { font-size: 16px; color: var(--text-light); max-width: 600px; }
.section-header { text-align: center; margin-bottom: 52px; }
.section-header .section-desc { margin: 0 auto; }

/* ---- 按钮 ---- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 28px; border-radius: 50px; font-size: 15px; font-weight: 700; transition: var(--transition); }
.btn-primary { background: var(--gradient); color: #fff; box-shadow: 0 4px 20px rgba(212,67,124,0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(212,67,124,0.45); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { background: var(--accent); color: var(--dark); }

/* ---- Header ---- */
.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: 24px; height: 70px; }
.logo { flex-shrink: 0; }
.logo-img { height: 48px; width: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* 导航 */
.main-nav { flex: 1; }
.nav-list { display: flex; gap: 4px; }
.nav-list li a { display: block; padding: 8px 14px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; color: var(--text); transition: var(--transition); white-space: nowrap; }
.nav-list li a:hover, .nav-list li.active a { color: var(--primary); background: rgba(212,67,124,0.08); }

/* 搜索框 */
.header-search { flex-shrink: 0; }
.search-form { display: flex; align-items: center; background: var(--bg); border: 1.5px solid var(--border); border-radius: 50px; overflow: hidden; transition: var(--transition); }
.search-form:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(212,67,124,0.12); }
.search-input { border: none; background: transparent; padding: 8px 16px; font-size: 14px; width: 200px; outline: none; color: var(--text); }
.search-btn { padding: 8px 14px; color: var(--primary); transition: var(--transition); }
.search-btn:hover { color: var(--primary-dark); }
.search-btn svg { display: block; }

/* 移动菜单按钮 */
.mobile-menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; margin-left: auto; }
.mobile-menu-toggle span { display: block; width: 24px; height: 2px; background: var(--dark); border-radius: 2px; transition: var(--transition); }

/* ---- 面包屑 ---- */
.breadcrumb-wrap { background: var(--gradient-soft); border-bottom: 1px solid var(--border); }
.breadcrumb { display: flex; align-items: center; gap: 8px; padding: 10px 0; font-size: 13px; color: var(--text-light); flex-wrap: wrap; }
.breadcrumb a { color: var(--primary); }
.breadcrumb a:hover { text-decoration: underline; }

/* ---- Hero ---- */
.hero { position: relative; min-height: 580px; display: flex; align-items: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(120deg, rgba(28,16,40,0.88) 0%, rgba(107,47,160,0.65) 60%, rgba(212,67,124,0.40) 100%); }
.hero-content { position: relative; z-index: 2; max-width: 640px; }
.hero-tag { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.15); backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,0.25); border-radius: 50px; padding: 6px 16px; font-size: 13px; color: #fff; margin-bottom: 24px; }
.hero-tag-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.6;transform:scale(1.3)} }
.hero h1 { font-size: clamp(32px, 5vw, 56px); font-weight: 900; color: #fff; line-height: 1.15; margin-bottom: 20px; }
.hero h1 .brand-highlight { color: var(--accent); }
.hero-desc { font-size: 17px; color: rgba(255,255,255,0.85); margin-bottom: 36px; line-height: 1.7; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 40px; margin-top: 48px; }
.hero-stat-num { font-size: 28px; font-weight: 900; color: var(--accent); }
.hero-stat-label { font-size: 13px; color: rgba(255,255,255,0.7); margin-top: 2px; }

/* ---- 视频卡片 ---- */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.video-card { background: var(--bg-card); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.video-thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--dark-2); }
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-duration { position: absolute; bottom: 10px; right: 10px; background: rgba(0,0,0,0.75); color: #fff; font-size: 12px; font-weight: 700; padding: 3px 8px; border-radius: 4px; }
.video-quality { position: absolute; top: 10px; left: 10px; background: var(--gradient); color: #fff; font-size: 11px; font-weight: 800; padding: 2px 8px; border-radius: 4px; letter-spacing: 0.5px; }
.play-btn { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; opacity: 0; transition: var(--transition); background: rgba(212,67,124,0.25); backdrop-filter: blur(2px); }
.video-card:hover .play-btn { opacity: 1; }
.play-icon { width: 56px; height: 56px; background: var(--gradient); border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 20px rgba(212,67,124,0.5); transform: scale(0.85); transition: var(--transition); }
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after { content: ''; border-left: 20px solid #fff; border-top: 12px solid transparent; border-bottom: 12px solid transparent; margin-left: 4px; }
.video-info { padding: 16px; }
.video-title { font-size: 14px; font-weight: 700; color: var(--dark); margin-bottom: 10px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-title a:hover { color: var(--primary); }
.video-meta { display: flex; gap: 16px; font-size: 12px; color: var(--text-light); }
.live-badge { position: absolute; top: 10px; right: 10px; background: #FF3B3B; color: #fff; font-size: 11px; font-weight: 800; padding: 3px 10px; border-radius: 4px; display: flex; align-items: center; gap: 4px; }
.live-dot { width: 6px; height: 6px; background: #fff; border-radius: 50%; animation: pulse 1.2s infinite; }

/* ---- 统计数字 ---- */
.stats-bar { background: var(--gradient); padding: 40px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item { color: #fff; }
.stat-num { font-size: 36px; font-weight: 900; line-height: 1; }
.stat-label { font-size: 13px; opacity: 0.85; margin-top: 6px; }

/* ---- 专家卡片 ---- */
.experts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 28px; }
.expert-card { background: var(--bg-card); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); transition: var(--transition); text-align: center; }
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.expert-avatar { width: 88px; height: 88px; border-radius: 50%; object-fit: cover; margin: 0 auto 16px; border: 3px solid var(--primary); }
.expert-name { font-size: 18px; font-weight: 800; color: var(--dark); margin-bottom: 4px; }
.expert-role { font-size: 13px; color: var(--primary); font-weight: 600; margin-bottom: 12px; }
.expert-desc { font-size: 13px; color: var(--text-light); line-height: 1.7; margin-bottom: 16px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.award-tag { font-size: 11px; background: var(--gradient-soft); color: var(--secondary); padding: 3px 10px; border-radius: 20px; font-weight: 600; }
.expert-btns { display: flex; gap: 10px; justify-content: center; }
.expert-btn { font-size: 12px; padding: 7px 16px; border-radius: 50px; font-weight: 700; transition: var(--transition); }
.expert-btn-primary { background: var(--gradient); color: #fff; }
.expert-btn-outline { border: 1.5px solid var(--primary); color: var(--primary); }
.expert-btn-outline:hover { background: var(--primary); color: #fff; }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--bg-card); border-radius: var(--radius-sm); border: 1px solid var(--border); overflow: hidden; }
.faq-question { display: flex; justify-content: space-between; align-items: center; padding: 18px 22px; cursor: pointer; font-size: 15px; font-weight: 700; color: var(--dark); gap: 16px; transition: var(--transition); }
.faq-question:hover { color: var(--primary); }
.faq-icon { flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%; background: var(--gradient-soft); display: flex; align-items: center; justify-content: center; color: var(--primary); font-size: 18px; font-weight: 300; transition: var(--transition); }
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--gradient); color: #fff; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-answer-inner { padding: 0 22px 18px; font-size: 14px; color: var(--text-light); line-height: 1.8; }
.faq-item.open .faq-answer { max-height: 300px; }

/* ---- 用户评论 ---- */
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.review-card { background: var(--bg-card); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); border-left: 4px solid var(--primary); transition: var(--transition); }
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-header { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.reviewer-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--gradient); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; font-weight: 800; flex-shrink: 0; }
.reviewer-name { font-size: 15px; font-weight: 700; color: var(--dark); }
.reviewer-tag { font-size: 12px; color: var(--text-light); }
.review-stars { color: var(--accent); font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 14px; color: var(--text-light); line-height: 1.8; }
.review-date { font-size: 12px; color: var(--border); margin-top: 12px; }

/* ---- AI赋能模块 ---- */
.ai-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.ai-features { display: flex; flex-direction: column; gap: 20px; }
.ai-feature-item { display: flex; gap: 16px; align-items: flex-start; }
.ai-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--gradient); display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.ai-feature-title { font-size: 16px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.ai-feature-desc { font-size: 13px; color: var(--text-light); line-height: 1.7; }

/* ---- 社区功能 ---- */
.community-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.community-card { background: var(--bg-card); border-radius: var(--radius); padding: 28px 22px; text-align: center; box-shadow: var(--shadow); transition: var(--transition); border-top: 3px solid transparent; }
.community-card:hover { border-top-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.community-icon { font-size: 36px; margin-bottom: 16px; }
.community-title { font-size: 17px; font-weight: 800; color: var(--dark); margin-bottom: 10px; }
.community-desc { font-size: 13px; color: var(--text-light); line-height: 1.7; }

/* ---- 合作品牌 ---- */
.partners-grid { display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; align-items: center; }
.partner-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 28px; font-size: 15px; font-weight: 700; color: var(--text-light); transition: var(--transition); }
.partner-item:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow); }

/* ---- 加入步骤 ---- */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-item { text-align: center; position: relative; }
.step-item:not(:last-child)::after { content: '→'; position: absolute; right: -12px; top: 20px; font-size: 20px; color: var(--border); }
.step-num { width: 48px; height: 48px; border-radius: 50%; background: var(--gradient); color: #fff; font-size: 20px; font-weight: 900; display: flex; align-items: center; justify-content: center; margin: 0 auto 14px; }
.step-title { font-size: 15px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--text-light); line-height: 1.6; }

/* ---- 联系 ---- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info-item { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 24px; }
.contact-icon { width: 44px; height: 44px; border-radius: 10px; background: var(--gradient-soft); display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.contact-label { font-size: 12px; color: var(--text-light); margin-bottom: 4px; }
.contact-value { font-size: 15px; font-weight: 700; color: var(--dark); }
.qr-grid { display: flex; gap: 24px; }
.qr-item { text-align: center; }
.qr-box { width: 120px; height: 120px; background: var(--gradient-soft); border: 2px dashed var(--border); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 40px; margin-bottom: 8px; }
.qr-label { font-size: 12px; color: var(--text-light); font-weight: 600; }

/* ---- 页内Banner ---- */
.page-hero { position: relative; min-height: 280px; display: flex; align-items: center; background-size: cover; background-position: center; }
.page-hero-overlay { position: absolute; inset: 0; background: linear-gradient(120deg, rgba(28,16,40,0.88) 0%, rgba(107,47,160,0.70) 100%); }
.page-hero-content { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 900; color: #fff; margin-bottom: 12px; }
.page-hero p { font-size: 16px; color: rgba(255,255,255,0.82); max-width: 560px; }

/* ---- 页脚 ---- */
.site-footer { background: var(--dark); color: rgba(255,255,255,0.75); }
.footer-top { padding: 60px 0 40px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand-logo { height: 44px; width: auto; margin-bottom: 16px; filter: brightness(0) invert(1); opacity: 0.9; }
.footer-brand-desc { font-size: 13px; line-height: 1.8; margin-bottom: 20px; color: rgba(255,255,255,0.6); }
.footer-social { display: flex; gap: 10px; }
.social-btn { width: 36px; height: 36px; border-radius: 8px; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; font-size: 16px; transition: var(--transition); }
.social-btn:hover { background: var(--primary); }
.footer-col-title { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 13px; color: rgba(255,255,255,0.6); transition: var(--transition); }
.footer-links a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: gap; font-size: 13px; color: rgba(255,255,255,0.45); gap: 16px; flex-wrap: wrap; }
.footer-bottom a { color: rgba(255,255,255,0.45); }
.footer-bottom a:hover { color: var(--primary); }
.update-time { color: rgba(255,255,255,0.35); font-size: 12px; }

/* ---- 动画 ---- */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .step-item:nth-child(2)::after { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .main-nav { display: none; position: fixed; top: 70px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 16px; z-index: 999; box-shadow: 0 8px 24px rgba(0,0,0,0.1); }
  .main-nav.open { display: block; }
  .nav-list { flex-direction: column; gap: 4px; }
  .mobile-menu-toggle { display: flex; }
  .header-search { display: none; }
  .hero { min-height: 460px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .contact-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .experts-grid { grid-template-columns: 1fr; }
  .qr-grid { justify-content: center; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
  .hero-btns { flex-direction: column; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: 1fr; }
  .step-item::after { display: none !important; }
}