/* 丝瓜视频 - 897587.cn 原创样式表 */
/* 配色：暖橘 #FF6B35 + 深紫 #7B2D8E + 金黄 #F7C948 */

:root {
  --primary: #FF6B35;
  --secondary: #7B2D8E;
  --accent: #F7C948;
  --bg-dark: #0F0A1A;
  --bg-card: #1A1230;
  --bg-card-hover: #231845;
  --text-main: #F0E6FF;
  --text-muted: #A89BC2;
  --text-dark: #6B5B8A;
  --gradient-main: linear-gradient(135deg, #FF6B35, #7B2D8E);
  --gradient-warm: linear-gradient(135deg, #FF6B35, #F7C948);
  --gradient-cool: linear-gradient(135deg, #7B2D8E, #4A1A6B);
  --border-color: rgba(123,45,142,0.3);
  --shadow-glow: 0 4px 30px rgba(255,107,53,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}

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

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

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

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

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

.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(15,10,26,0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1240px; margin: 0 auto; padding: 0 20px; height: 68px;
}

.site-logo { display: flex; align-items: center; gap: 10px; }
.site-logo img { height: 40px; width: auto; }
.site-logo .logo-text {
  font-size: 1.35rem; font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  color: var(--text-muted); padding: 8px 16px; border-radius: 8px;
  font-size: 0.95rem; font-weight: 500; transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-main); background: rgba(255,107,53,0.12);
}

.search-box {
  display: flex; align-items: center; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: 24px;
  padding: 6px 16px; gap: 8px; min-width: 200px;
}
.search-box input {
  background: none; border: none; outline: none; color: var(--text-main);
  font-size: 0.9rem; width: 140px;
}
.search-box input::placeholder { color: var(--text-dark); }
.search-box button {
  background: none; border: none; color: var(--primary); cursor: pointer;
  font-size: 1.1rem; padding: 2px;
}

.mobile-toggle {
  display: none; background: none; border: none; color: var(--text-main);
  font-size: 1.5rem; cursor: pointer;
}

/* ===== Hero Banner ===== */
.hero-section {
  position: relative; min-height: 600px; display: flex; align-items: center;
  justify-content: center; text-align: center; margin-top: 68px;
  background: var(--gradient-cool); overflow: hidden;
}
.hero-section::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(255,107,53,0.2) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(123,45,142,0.25) 0%, transparent 60%);
}
.hero-section::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
  background: linear-gradient(to top, var(--bg-dark), transparent);
}
.hero-content { position: relative; z-index: 2; padding: 60px 20px; }
.hero-content h1 {
  font-size: 3rem; font-weight: 800; margin-bottom: 16px;
  background: var(--gradient-warm);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1.3;
}
.hero-content .hero-desc {
  font-size: 1.15rem; color: var(--text-muted); max-width: 680px;
  margin: 0 auto 30px; line-height: 1.8;
}
.hero-stats {
  display: flex; justify-content: center; gap: 50px; margin-top: 30px;
}
.hero-stats .stat-item { text-align: center; }
.hero-stats .stat-num {
  font-size: 2.2rem; font-weight: 800; color: var(--accent);
}
.hero-stats .stat-label { font-size: 0.9rem; color: var(--text-muted); margin-top: 4px; }

.btn-primary {
  display: inline-block; padding: 14px 36px; background: var(--gradient-main);
  color: #fff; border-radius: 30px; font-size: 1.05rem; font-weight: 600;
  border: none; cursor: pointer; transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255,107,53,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: 0 6px 30px rgba(255,107,53,0.5);
  color: #fff;
}
.btn-outline {
  display: inline-block; padding: 12px 30px;
  border: 2px solid var(--primary); color: var(--primary);
  border-radius: 30px; font-size: 1rem; font-weight: 600;
  transition: var(--transition);
}
.btn-outline:hover {
  background: var(--primary); color: #fff;
}

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header h2 {
  font-size: 2rem; font-weight: 700; margin-bottom: 12px;
  background: var(--gradient-main);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-header p { color: var(--text-muted); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }
.section-alt { background: var(--bg-card); }

/* ===== 视频卡片网格 ===== */
.video-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.video-card {
  background: var(--bg-card); border-radius: var(--radius);
  overflow: hidden; border: 1px solid var(--border-color);
  transition: var(--transition); position: relative;
}
.video-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-glow);
  border-color: var(--primary);
}
.video-thumb {
  position: relative; aspect-ratio: 16/9; overflow: hidden; background: #120D22;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover; transition: var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0.8);
  width: 56px; height: 56px; background: rgba(255,107,53,0.9);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: var(--transition);
}
.video-play-btn::after {
  content: ''; width: 0; height: 0;
  border-left: 18px solid #fff; border-top: 11px solid transparent;
  border-bottom: 11px solid transparent; margin-left: 4px;
}
.video-card:hover .video-play-btn { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75); color: #fff; padding: 2px 8px;
  border-radius: 4px; font-size: 0.8rem;
}
.video-info { padding: 14px 16px; }
.video-info h3 {
  font-size: 0.95rem; font-weight: 600; color: var(--text-main);
  margin-bottom: 8px; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-meta {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.8rem; color: var(--text-dark);
}
.video-meta .views { color: var(--primary); }

/* ===== 分类标签栏 ===== */
.category-tabs {
  display: flex; gap: 12px; margin-bottom: 30px; flex-wrap: wrap;
  justify-content: center;
}
.category-tabs .tab {
  padding: 8px 22px; border-radius: 20px; font-size: 0.9rem;
  background: var(--bg-card); color: var(--text-muted);
  border: 1px solid var(--border-color); cursor: pointer;
  transition: var(--transition);
}
.category-tabs .tab:hover, .category-tabs .tab.active {
  background: var(--gradient-main); color: #fff; border-color: transparent;
}

/* ===== 影视传媒专区 ===== */
.media-showcase {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.media-item {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 30px; border: 1px solid var(--border-color);
  transition: var(--transition); text-align: center;
}
.media-item:hover {
  border-color: var(--primary); transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.media-icon {
  width: 64px; height: 64px; margin: 0 auto 16px;
  background: var(--gradient-main); border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}
.media-item h3 { font-size: 1.15rem; margin-bottom: 10px; color: var(--text-main); }
.media-item p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }

/* ===== AI赋能板块 ===== */
.ai-features {
  display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center;
}
.ai-visual { position: relative; border-radius: var(--radius-lg); overflow: hidden; }
.ai-visual img { width: 100%; border-radius: var(--radius-lg); }
.ai-list { display: flex; flex-direction: column; gap: 20px; }
.ai-item {
  display: flex; gap: 16px; padding: 20px;
  background: var(--bg-card); border-radius: var(--radius);
  border: 1px solid var(--border-color); transition: var(--transition);
}
.ai-item:hover { border-color: var(--accent); }
.ai-item-icon {
  width: 48px; height: 48px; flex-shrink: 0;
  background: var(--gradient-warm); border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
}
.ai-item h4 { font-size: 1.05rem; margin-bottom: 6px; color: var(--text-main); }
.ai-item p { font-size: 0.88rem; color: var(--text-muted); }

/* ===== 专家团队 ===== */
.team-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.team-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 30px 20px; text-align: center;
  border: 1px solid var(--border-color); transition: var(--transition);
}
.team-card:hover {
  border-color: var(--primary); transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.team-avatar {
  width: 90px; height: 90px; border-radius: 50%; margin: 0 auto 16px;
  overflow: hidden; border: 3px solid var(--primary);
}
.team-avatar img { width: 100%; height: 100%; object-fit: cover; }
.team-card h3 { font-size: 1.1rem; margin-bottom: 4px; }
.team-card .role { color: var(--primary); font-size: 0.85rem; margin-bottom: 10px; }
.team-card p { color: var(--text-muted); font-size: 0.85rem; line-height: 1.6; }
.team-links { margin-top: 14px; display: flex; gap: 10px; justify-content: center; }
.team-links a {
  padding: 6px 14px; border-radius: 16px; font-size: 0.8rem;
  background: rgba(255,107,53,0.12); color: var(--primary);
}
.team-links a:hover { background: var(--primary); color: #fff; }

/* ===== 合作品牌 ===== */
.brand-wall {
  display: flex; flex-wrap: wrap; gap: 20px; justify-content: center;
  align-items: center;
}
.brand-wall .brand-logo {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 18px 28px;
  font-size: 1rem; color: var(--text-muted); font-weight: 600;
  transition: var(--transition);
}
.brand-wall .brand-logo:hover {
  border-color: var(--primary); color: var(--text-main);
}

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); margin-bottom: 14px; overflow: hidden;
}
.faq-question {
  padding: 18px 24px; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center;
  font-weight: 600; font-size: 1rem; color: var(--text-main);
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-question .faq-toggle {
  font-size: 1.3rem; color: var(--primary); transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-toggle { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
  padding: 0 24px; color: var(--text-muted); font-size: 0.95rem; line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding-bottom: 18px; }

/* ===== 用户评论 ===== */
.review-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.review-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--border-color);
  transition: var(--transition);
}
.review-card:hover { border-color: var(--accent); }
.review-stars { color: var(--accent); font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { color: var(--text-muted); font-size: 0.92rem; line-height: 1.8; margin-bottom: 16px; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-author-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gradient-main); display: flex; align-items: center;
  justify-content: center; color: #fff; font-weight: 700; font-size: 0.9rem;
}
.review-author-name { font-weight: 600; font-size: 0.9rem; }
.review-author-date { font-size: 0.8rem; color: var(--text-dark); }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.contact-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 30px; text-align: center;
  border: 1px solid var(--border-color);
}
.contact-icon {
  width: 56px; height: 56px; margin: 0 auto 14px;
  background: var(--gradient-main); border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
}
.contact-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.contact-card p { color: var(--text-muted); font-size: 0.9rem; }

/* ===== 社交分享 ===== */
.share-section { text-align: center; padding: 40px 0; }
.share-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  padding: 10px 22px; border-radius: 24px; font-size: 0.9rem;
  background: var(--bg-card); color: var(--text-muted);
  border: 1px solid var(--border-color); transition: var(--transition);
}
.share-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 页脚 ===== */
.site-footer {
  background: #0A0714; border-top: 1px solid var(--border-color);
  padding: 50px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand .footer-logo img { height: 36px; }
.footer-brand .footer-logo span {
  font-size: 1.2rem; font-weight: 700; color: var(--primary);
}
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }
.footer-col h4 {
  font-size: 1rem; font-weight: 600; margin-bottom: 16px;
  color: var(--text-main);
}
.footer-col a {
  display: block; color: var(--text-muted); font-size: 0.9rem;
  padding: 4px 0; transition: var(--transition);
}
.footer-col a:hover { color: var(--primary); padding-left: 6px; }
.footer-qr { display: flex; gap: 16px; margin-top: 16px; }
.footer-qr img { width: 90px; height: 90px; border-radius: 8px; }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 0; text-align: center;
  color: var(--text-dark); font-size: 0.85rem;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 20px 0; font-size: 0.88rem; color: var(--text-dark);
  margin-top: 68px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* ===== 内页通用 ===== */
.page-hero {
  padding: 100px 0 50px; text-align: center;
  background: var(--gradient-cool); margin-top: 68px; position: relative;
}
.page-hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 80px;
  background: linear-gradient(to top, var(--bg-dark), transparent);
}
.page-hero h1 {
  font-size: 2.4rem; font-weight: 800; margin-bottom: 12px;
  position: relative; z-index: 2;
}
.page-hero p {
  color: var(--text-muted); font-size: 1.05rem; position: relative; z-index: 2;
}

/* ===== How-To 指南 ===== */
.howto-steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.howto-step {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 28px 20px; text-align: center;
  border: 1px solid var(--border-color); position: relative;
}
.howto-step .step-num {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gradient-main); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.1rem; margin: 0 auto 14px;
}
.howto-step h4 { font-size: 1rem; margin-bottom: 8px; }
.howto-step p { color: var(--text-muted); font-size: 0.85rem; }

/* ===== 社区功能 ===== */
.community-features {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.community-card {
  background: var(--bg-card); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--border-color);
  transition: var(--transition);
}
.community-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.community-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.community-card p { color: var(--text-muted); font-size: 0.9rem; }

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

@media (max-width: 768px) {
  .main-nav { display: none; }
  .mobile-toggle { display: block; }
  .main-nav.open {
    display: flex; flex-direction: column; position: absolute;
    top: 68px; left: 0; right: 0; background: rgba(15,10,26,0.98);
    padding: 20px; border-bottom: 1px solid var(--border-color);
  }
  .hero-content h1 { font-size: 2rem; }
  .hero-stats { gap: 24px; }
  .hero-stats .stat-num { font-size: 1.6rem; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .media-showcase { grid-template-columns: 1fr; }
  .ai-features { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .search-box { min-width: 160px; }
  .search-box input { width: 100px; }
  .section { padding: 50px 0; }
  .section-header h2 { font-size: 1.6rem; }
  .howto-steps { grid-template-columns: 1fr; }
  .community-features { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .team-grid { grid-template-columns: 1fr; }
  .category-tabs { gap: 8px; }
  .category-tabs .tab { padding: 6px 16px; font-size: 0.85rem; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--secondary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }