/* =============================================
   91传媒 - 原创样式表
   品牌：91 | 域名：tl675602.cn
   配色：玫瑰红 #E8436F / 深紫 #2D1B69 / 暖橙 #FF8C42
   ============================================= */

/* === 基础重置与变量 === */
:root {
  --rose: #E8436F;
  --purple: #2D1B69;
  --orange: #FF8C42;
  --bg-light: #FFF5F7;
  --bg-dark: #1A0E2E;
  --text-main: #2C2C2C;
  --text-sub: #6B6B6B;
  --white: #FFFFFF;
  --card-shadow: 0 4px 20px rgba(45,27,105,0.08);
  --radius: 12px;
  --transition: all 0.3s ease;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--rose); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--purple); }

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

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

/* === 顶部导航 === */
.top-bar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 16px rgba(45,27,105,0.06);
  height: 64px;
}

.nav-wrap {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; height: 64px; gap: 20px;
}

.logo-area a {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1.2rem; color: var(--purple);
}

.logo-img { border-radius: 8px; }

.site-name { white-space: nowrap; }

.search-box {
  display: flex; flex: 1; max-width: 360px;
  border: 2px solid #EDE0F0; border-radius: 24px; overflow: hidden;
  transition: var(--transition);
}

.search-box:focus-within { border-color: var(--rose); }

.search-box input {
  flex: 1; border: none; outline: none; padding: 8px 16px;
  font-size: 0.9rem; background: transparent; color: var(--text-main);
}

.search-box button {
  border: none; background: var(--rose); color: var(--white);
  padding: 8px 18px; cursor: pointer; font-size: 0.85rem;
  transition: var(--transition);
}

.search-box button:hover { background: var(--purple); }

.main-nav ul { display: flex; list-style: none; gap: 4px; }

.main-nav a {
  display: block; padding: 8px 14px; border-radius: 8px;
  font-size: 0.9rem; color: var(--text-main); white-space: nowrap;
}

.main-nav a:hover, .main-nav .nav-active { background: var(--bg-light); color: var(--rose); }

.mobile-toggle {
  display: none; border: none; background: none;
  font-size: 1.5rem; cursor: pointer; color: var(--purple); padding: 4px;
}

/* === Hero Banner === */
.hero-section {
  position: relative; min-height: 540px; display: flex; align-items: center;
  justify-content: center; text-align: center; margin-top: 64px;
  overflow: hidden;
}

.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
}

.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(45,27,105,0.75), rgba(232,67,111,0.6));
}

.hero-content {
  position: relative; z-index: 2; color: var(--white);
  max-width: 800px; padding: 60px 20px;
}

.hero-content h1 {
  font-size: 2.4rem; font-weight: 800; margin-bottom: 16px;
  line-height: 1.3; text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.hero-content h1 em { font-style: normal; color: var(--orange); }

.hero-desc { font-size: 1.1rem; opacity: 0.92; margin-bottom: 28px; line-height: 1.8; }

.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 24px; }

.btn-primary {
  display: inline-block; padding: 12px 32px; border-radius: 28px;
  background: linear-gradient(135deg, var(--rose), var(--orange));
  color: var(--white); font-weight: 600; font-size: 1rem;
  box-shadow: 0 4px 16px rgba(232,67,111,0.35);
  transition: var(--transition);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(232,67,111,0.45); color: var(--white); }

.btn-outline {
  display: inline-block; padding: 12px 32px; border-radius: 28px;
  border: 2px solid var(--white); color: var(--white);
  font-weight: 600; font-size: 1rem; transition: var(--transition);
}

.btn-outline:hover { background: var(--white); color: var(--rose); }

.hero-tags { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.hero-tags span {
  padding: 4px 14px; border-radius: 16px; font-size: 0.8rem;
  background: rgba(255,255,255,0.18); backdrop-filter: blur(4px);
}

/* === 通用区块样式 === */
section { padding: 72px 0; }

.sec-header { text-align: center; margin-bottom: 48px; }

.sec-header h2 {
  font-size: 1.9rem; font-weight: 700; color: var(--purple);
  margin-bottom: 12px;
}

.sec-sub { color: var(--text-sub); font-size: 1rem; max-width: 680px; margin: 0 auto; }

.sec-more { text-align: center; margin-top: 36px; }

.sec-more a {
  font-weight: 600; font-size: 1rem; color: var(--rose);
  padding: 10px 28px; border: 2px solid var(--rose); border-radius: 24px;
  display: inline-block; transition: var(--transition);
}

.sec-more a:hover { background: var(--rose); color: var(--white); }

/* === 视频卡片网格 === */
.vid-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px;
}

.vid-card {
  background: var(--white); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.vid-card:hover { transform: translateY(-6px); box-shadow: 0 8px 32px rgba(45,27,105,0.14); }

.vid-thumb {
  position: relative; overflow: hidden; cursor: pointer;
}

.vid-thumb img { width: 100%; aspect-ratio: 3/4; object-fit: cover; }

.play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 52px; height: 52px; border-radius: 50%;
  background: rgba(232,67,111,0.85); display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition);
}

.play-btn span { color: var(--white); font-size: 1.3rem; margin-left: 3px; }

.vid-thumb:hover .play-btn { opacity: 1; }

.play-btn.lg { width: 72px; height: 72px; }
.play-btn.lg span { font-size: 1.8rem; margin-left: 4px; }

.vid-dur {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.7); color: var(--white);
  padding: 2px 8px; border-radius: 4px; font-size: 0.75rem;
}

.vid-tag {
  position: absolute; top: 8px; left: 8px;
  background: var(--rose); color: var(--white);
  padding: 2px 10px; border-radius: 4px; font-size: 0.75rem;
}

.vid-info { padding: 14px; }

.vid-info h3 { font-size: 0.88rem; font-weight: 600; line-height: 1.4; margin-bottom: 8px; color: var(--text-main); }

.vid-meta { display: flex; gap: 8px; flex-wrap: wrap; font-size: 0.75rem; color: var(--text-sub); }

/* === 影视传媒专区 === */
.media-section { background: var(--white); }

.media-showcase { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; }

.vid-thumb.large { border-radius: var(--radius); overflow: hidden; }

.media-caption {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 24px; background: linear-gradient(transparent, rgba(0,0,0,0.75));
  color: var(--white);
}

.media-caption h3 { font-size: 1.2rem; margin-bottom: 6px; }
.media-caption p { font-size: 0.85rem; opacity: 0.85; }

.media-sidebar { display: flex; flex-direction: column; gap: 16px; }

.media-item {
  padding: 20px; background: var(--bg-light); border-radius: var(--radius);
  border-left: 4px solid var(--rose); transition: var(--transition);
}

.media-item:hover { border-left-color: var(--orange); transform: translateX(4px); }

.media-item h4 { font-size: 0.95rem; color: var(--purple); margin-bottom: 6px; }
.media-item p { font-size: 0.83rem; color: var(--text-sub); margin-bottom: 8px; }
.media-stat { font-size: 0.78rem; color: var(--rose); font-weight: 500; }

/* === 娱乐专区 === */
.fun-section { background: linear-gradient(135deg, var(--purple), #3D2580); color: var(--white); }
.fun-section .sec-header h2 { color: var(--white); }
.fun-section .sec-sub { color: rgba(255,255,255,0.7); }

.fun-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.fun-item {
  padding: 32px 24px; border-radius: var(--radius);
  background: rgba(255,255,255,0.08); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.12); text-align: center;
  transition: var(--transition);
}

.fun-item:hover { background: rgba(255,255,255,0.15); transform: translateY(-4px); }

.fun-icon { font-size: 2.4rem; margin-bottom: 16px; }

.fun-item h4 { font-size: 1.05rem; margin-bottom: 10px; }
.fun-item p { font-size: 0.85rem; opacity: 0.8; margin-bottom: 12px; line-height: 1.6; }
.fun-count { font-size: 0.8rem; color: var(--orange); font-weight: 600; }

/* === AI赋能 & 社区 双栏 === */
.media-row { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.media-row.reverse { direction: rtl; }
.media-row.reverse > * { direction: ltr; }

.media-img img { border-radius: var(--radius); box-shadow: var(--card-shadow); }

.media-text h2 { font-size: 1.8rem; color: var(--purple); margin-bottom: 16px; }
.media-text p { color: var(--text-sub); margin-bottom: 20px; line-height: 1.8; }

.ai-features { list-style: none; margin-bottom: 24px; }
.ai-features li {
  padding: 10px 0; border-bottom: 1px solid #F0E6F3;
  font-size: 0.92rem; line-height: 1.6;
}
.ai-features li strong { color: var(--rose); }

/* === 社区功能 === */
.community-section { background: var(--white); }

.comm-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 24px; }

.comm-feat {
  padding: 16px; border-radius: 10px; background: var(--bg-light);
  border: 1px solid #F0E6F3;
}

.comm-feat h5 { font-size: 0.95rem; color: var(--purple); margin-bottom: 6px; }
.comm-feat p { font-size: 0.83rem; color: var(--text-sub); line-height: 1.5; }

/* === 专家团队 === */
.expert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.expert-card {
  background: var(--white); border-radius: var(--radius); padding: 28px 20px;
  text-align: center; box-shadow: var(--card-shadow); transition: var(--transition);
}

.expert-card:hover { transform: translateY(-6px); box-shadow: 0 8px 32px rgba(45,27,105,0.14); }

.expert-card img { width: 100px; height: 100px; border-radius: 50%; margin: 0 auto 16px; object-fit: cover; }

.expert-card h4 { font-size: 1.1rem; color: var(--purple); margin-bottom: 4px; }

.expert-title { display: block; font-size: 0.82rem; color: var(--rose); margin-bottom: 12px; font-weight: 500; }

.expert-card p { font-size: 0.83rem; color: var(--text-sub); line-height: 1.6; margin-bottom: 12px; }

.expert-tags { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; margin-bottom: 16px; }

.expert-tags span {
  padding: 3px 10px; border-radius: 12px; font-size: 0.72rem;
  background: var(--bg-light); color: var(--purple);
}

.expert-btns { display: flex; gap: 8px; justify-content: center; }

.btn-sm {
  padding: 6px 16px; border-radius: 16px; font-size: 0.8rem;
  background: var(--rose); color: var(--white); transition: var(--transition);
}

.btn-sm:hover { background: var(--purple); color: var(--white); }

.btn-sm-outline {
  padding: 6px 16px; border-radius: 16px; font-size: 0.8rem;
  border: 1px solid var(--rose); color: var(--rose); transition: var(--transition);
}

.btn-sm-outline:hover { background: var(--rose); color: var(--white); }

/* === 合作品牌 === */
.partners-section { background: var(--white); }

.partner-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.partner-item {
  padding: 28px; text-align: center; border-radius: var(--radius);
  background: var(--bg-light); border: 1px solid #F0E6F3;
  font-weight: 600; color: var(--purple); font-size: 1rem;
  transition: var(--transition);
}

.partner-item:hover { border-color: var(--rose); box-shadow: 0 4px 16px rgba(232,67,111,0.1); }

/* === How-To步骤 === */
.howto-section { background: linear-gradient(135deg, var(--bg-light), #F3E8F9); }

.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }

.step-item {
  text-align: center; padding: 36px 24px;
  background: var(--white); border-radius: var(--radius);
  box-shadow: var(--card-shadow); position: relative;
}

.step-num {
  font-size: 2.8rem; font-weight: 800; color: var(--rose); opacity: 0.2;
  position: absolute; top: 12px; left: 20px;
}

.step-item h4 { font-size: 1.1rem; color: var(--purple); margin-bottom: 12px; margin-top: 20px; }
.step-item p { font-size: 0.88rem; color: var(--text-sub); line-height: 1.7; }

/* === FAQ === */
.faq-section { background: var(--white); }

.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item { border-bottom: 1px solid #F0E6F3; }

.faq-q {
  padding: 18px 0; font-weight: 600; font-size: 1rem; color: var(--purple);
  cursor: pointer; position: relative; padding-right: 30px;
}

.faq-q::after {
  content: '+'; position: absolute; right: 0; top: 18px;
  font-size: 1.4rem; color: var(--rose); transition: var(--transition);
}

.faq-item.active .faq-q::after { content: '-'; }

.faq-a {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease;
  font-size: 0.9rem; color: var(--text-sub); line-height: 1.8;
}

.faq-item.active .faq-a { max-height: 300px; padding-bottom: 18px; }

/* === 用户评价 === */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.review-card {
  background: var(--white); border-radius: var(--radius); padding: 28px;
  box-shadow: var(--card-shadow); transition: var(--transition);
}

.review-card:hover { transform: translateY(-4px); }

.review-stars { color: var(--orange); font-size: 1.1rem; margin-bottom: 12px; letter-spacing: 2px; }

.review-text { font-size: 0.9rem; color: var(--text-main); line-height: 1.7; margin-bottom: 16px; font-style: italic; }

.review-author strong { display: block; font-size: 0.9rem; color: var(--purple); }
.review-author span { font-size: 0.78rem; color: var(--text-sub); }

/* === 联系我们 === */
.contact-section { background: var(--bg-dark); color: var(--white); }
.contact-section .sec-header h2 { color: var(--white); }
.contact-section .sec-sub { color: rgba(255,255,255,0.6); }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }

.contact-info h4 { font-size: 1.1rem; color: var(--orange); margin-bottom: 12px; margin-top: 20px; }
.contact-info h4:first-child { margin-top: 0; }
.contact-info p { font-size: 0.9rem; opacity: 0.85; margin-bottom: 6px; line-height: 1.7; }

.contact-qr { display: flex; gap: 32px; justify-content: center; }

.qr-item { text-align: center; }
.qr-item img { border-radius: 10px; margin-bottom: 8px; background: var(--white); padding: 8px; }
.qr-item span { font-size: 0.85rem; opacity: 0.7; }

/* === 社交分享 === */
.share-section { padding: 40px 0; text-align: center; background: var(--bg-light); }
.share-section h3 { font-size: 1.2rem; color: var(--purple); margin-bottom: 20px; }

.share-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.share-btn {
  padding: 10px 24px; border-radius: 20px; font-size: 0.9rem;
  color: var(--white); font-weight: 500; transition: var(--transition);
}

.share-btn.wechat { background: #07C160; }
.share-btn.weibo { background: #E6162D; }
.share-btn.douyin { background: #161823; }
.share-btn.bilibili { background: #00A1D6; }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; color: var(--white); }

/* === 页脚 === */
.site-footer { background: var(--bg-dark); color: var(--white); padding: 56px 0 24px; }

.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }

.footer-brand { display: flex; flex-direction: column; gap: 8px; }
.footer-brand img { border-radius: 8px; }
.footer-name { font-size: 1.2rem; font-weight: 700; }
.footer-desc { font-size: 0.85rem; opacity: 0.65; line-height: 1.6; }

.footer-links h5, .footer-contact h5 { font-size: 0.95rem; margin-bottom: 14px; color: var(--orange); }

.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: rgba(255,255,255,0.65); font-size: 0.88rem; }
.footer-links a:hover { color: var(--white); }

.footer-contact p { font-size: 0.85rem; opacity: 0.65; margin-bottom: 6px; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center;
}

.footer-bottom p { font-size: 0.82rem; opacity: 0.5; }

/* === 响应式 === */
@media (max-width: 1024px) {
  .vid-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; position: fixed; top: 64px; left: 0; right: 0; background: var(--white); padding: 16px; box-shadow: 0 4px 16px rgba(0,0,0,0.1); z-index: 999; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; }
  .mobile-toggle { display: block; }
  .search-box { max-width: 200px; }

  .hero-content h1 { font-size: 1.6rem; }
  .hero-section { min-height: 420px; }

  .vid-grid { grid-template-columns: repeat(2, 1fr); }
  .media-showcase { grid-template-columns: 1fr; }
  .media-row, .media-row.reverse { grid-template-columns: 1fr; }
  .fun-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .partner-wall { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .comm-features { grid-template-columns: 1fr; }

  .sec-header h2 { font-size: 1.4rem; }
}

@media (max-width: 480px) {
  .vid-grid { grid-template-columns: 1fr; }
  .fun-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .search-box { max-width: 140px; }
  .hero-content h1 { font-size: 1.3rem; }
  .contact-qr { flex-direction: column; align-items: center; }
}

/* === 懒加载占位 === */
img.lazy { opacity: 0; transition: opacity 0.4s ease; }
img.lazy.loaded { opacity: 1; }