/* =============================================
   糖心视频传媒社区 - 主样式文件
   ui21181.cn | 原创设计，版权所有
   ============================================= */

/* ===== CSS变量 ===== */
:root {
  --primary: #E8437A;
  --primary-dark: #C73060;
  --primary-light: #FF6B9D;
  --secondary: #A855F7;
  --accent: #FF9F43;
  --bg: #0F0A1E;
  --bg-card: #1A1230;
  --bg-card2: #130E22;
  --text: #F0EAF8;
  --text-muted: #8B7FA8;
  --border: rgba(168,85,247,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(232,67,122,0.15);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --gradient-primary: linear-gradient(135deg, #E8437A, #A855F7);
  --gradient-hero: linear-gradient(135deg, #0F0A1E 0%, #1A1230 50%, #0F0A1E 100%);
  --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: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; outline: none; }
input, textarea { font-family: inherit; outline: none; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: linear-gradient(90deg, #1A1230, #2D1B4E, #1A1230);
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
  padding: 8px 20px;
  border-bottom: 1px solid var(--border);
}
.top-bar strong { color: var(--primary); }

/* ===== 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,10,30,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.site-logo img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  object-fit: cover;
}
.logo-text {
  font-size: 20px;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}
.logo-sub {
  display: block;
  font-size: 10px;
  color: var(--text-muted);
  line-height: 1;
  margin-top: 2px;
}
.main-nav { flex: 1; }
.nav-list {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-list a:hover, .nav-list a.active {
  color: var(--primary);
  background: rgba(232,67,122,0.1);
}
.header-right {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-shrink: 0;
}
.btn-login {
  padding: 8px 18px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-muted);
  font-size: 13px;
  transition: var(--transition);
}
.btn-login:hover { border-color: var(--primary); color: var(--primary); }
.btn-join {
  padding: 8px 18px;
  background: var(--gradient-primary);
  border-radius: 20px;
  color: white;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-join:hover { opacity: 0.9; transform: translateY(-1px); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== 搜索栏 ===== */
.search-bar-wrap {
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.search-form {
  display: flex;
  gap: 0;
  max-width: 640px;
}
.search-input {
  flex: 1;
  padding: 10px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-right: none;
  border-radius: var(--radius) 0 0 var(--radius);
  color: var(--text);
  font-size: 14px;
  transition: var(--transition);
}
.search-input:focus { border-color: var(--primary); }
.search-input::placeholder { color: var(--text-muted); }
.search-btn {
  padding: 10px 20px;
  background: var(--gradient-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: white;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.search-btn:hover { opacity: 0.9; }
.search-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.search-tag {
  padding: 4px 12px;
  background: rgba(168,85,247,0.08);
  border: 1px solid rgba(168,85,247,0.2);
  border-radius: 20px;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover { border-color: var(--primary); color: var(--primary); background: rgba(232,67,122,0.08); }

/* ===== 面包屑 ===== */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 20px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb strong { color: var(--text); }
.breadcrumb span { color: var(--border); }

/* ===== 容器 ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 60px 0; }
.section-sm { padding: 32px 0; }

/* ===== 页面横幅 ===== */
.page-banner {
  background: linear-gradient(135deg, #1A1230, #2D1B4E);
  border-bottom: 1px solid var(--border);
  padding: 48px 0;
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(232,67,122,0.15), transparent 70%);
  pointer-events: none;
}
.page-banner-content h1 {
  font-size: 36px;
  font-weight: 900;
  margin-bottom: 10px;
}
.page-banner-content p { color: var(--text-muted); font-size: 16px; }

/* ===== 页面介绍 ===== */
.page-intro {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 40px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-muted);
}
.page-intro strong { color: var(--text); }

/* ===== 统计栏 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}
.stats-bar-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.stats-bar-num {
  font-size: 24px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stats-bar-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ===== 英雄区 ===== */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(168,85,247,0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 20% 80%, rgba(232,67,122,0.1) 0%, transparent 50%);
}
.hero-particles { position: absolute; inset: 0; pointer-events: none; }
.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.3;
  animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(0) scale(1); opacity: 0.3; }
  50% { transform: translateY(-30px) scale(1.2); opacity: 0.6; }
  100% { transform: translateY(0) scale(1); opacity: 0.3; }
}
.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 80px 20px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(232,67,122,0.1);
  border: 1px solid rgba(232,67,122,0.3);
  border-radius: 20px;
  font-size: 13px;
  color: var(--primary);
  margin-bottom: 20px;
}
.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.7; }
}
.hero-title {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-title .brand {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}
.hero-desc strong { color: var(--text); }
.hero-actions { display: flex; gap: 16px; margin-bottom: 40px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--gradient-primary);
  border-radius: 30px;
  color: white;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 8px 24px rgba(232,67,122,0.35);
  border: none;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(232,67,122,0.45); color: white; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: transparent;
  border: 2px solid rgba(232,67,122,0.4);
  border-radius: 30px;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: rgba(232,67,122,0.05); }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 22px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.hero-visual { position: relative; }
.hero-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.hero-img-wrap img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}
.hero-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  background: rgba(232,67,122,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 0 0 0 rgba(232,67,122,0.4);
  animation: ripple 2s ease-in-out infinite;
}
@keyframes ripple {
  0% { box-shadow: 0 0 0 0 rgba(232,67,122,0.4); }
  70% { box-shadow: 0 0 0 20px rgba(232,67,122,0); }
  100% { box-shadow: 0 0 0 0 rgba(232,67,122,0); }
}
.hero-play-btn svg { width: 28px; height: 28px; fill: white; margin-left: 4px; }
.hero-play-btn:hover { transform: translate(-50%, -50%) scale(1.1); }
.hero-float-card {
  position: absolute;
  bottom: -16px;
  left: -20px;
  background: rgba(26,18,48,0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-card);
}
.float-avatar { font-size: 24px; }
.float-info .name { font-size: 13px; font-weight: 700; }
.float-info .meta { font-size: 11px; color: var(--primary); }

/* ===== 分区标题 ===== */
.section-header { text-align: center; margin-bottom: 40px; }
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(232,67,122,0.1);
  border: 1px solid rgba(232,67,122,0.3);
  border-radius: 20px;
  font-size: 12px;
  color: var(--primary);
  margin-bottom: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.section-title {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc { color: var(--text-muted); font-size: 15px; max-width: 600px; margin: 0 auto; }

/* ===== 分类网格 ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 12px;
}
.cat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 10px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}
.cat-card:hover {
  border-color: var(--primary);
  background: rgba(232,67,122,0.05);
  transform: translateY(-3px);
}
.cat-icon { font-size: 24px; display: block; margin-bottom: 8px; }
.cat-name { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.cat-count { font-size: 11px; color: var(--text-muted); }

/* ===== 视频网格 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(232,67,122,0.3);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  background: var(--bg-card2);
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.video-card:hover .video-play-overlay { background: rgba(0,0,0,0.4); }
.play-circle {
  width: 52px;
  height: 52px;
  background: rgba(232,67,122,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.7);
  transition: var(--transition);
}
.video-card:hover .play-circle { opacity: 1; transform: scale(1); }
.play-circle svg { width: 22px; height: 22px; fill: white; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: white;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-quality {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(232,67,122,0.9);
  color: white;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 700;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
}
.author-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: white;
  font-weight: 700;
  flex-shrink: 0;
}
.author-name { font-size: 12px; color: var(--text-muted); }

/* ===== 筛选栏 ===== */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.filter-btn {
  padding: 8px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-muted);
  font-size: 13px;
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: rgba(232,67,122,0.1);
  border-color: var(--primary);
  color: var(--primary);
}

/* ===== 加载更多 ===== */
.load-more-wrap { text-align: center; margin-top: 40px; }
.btn-load-more {
  padding: 12px 36px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 30px;
  color: var(--text-muted);
  font-size: 14px;
  transition: var(--transition);
}
.btn-load-more:hover { border-color: var(--primary); color: var(--primary); }

/* ===== 直播网格 ===== */
.live-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.live-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.live-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.live-thumb {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
}
.live-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.live-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(255,59,48,0.9);
  color: white;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 5px;
}
.live-dot {
  width: 6px;
  height: 6px;
  background: white;
  border-radius: 50%;
  animation: pulse 1s ease-in-out infinite;
}
.live-viewers {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: white;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
}
.live-info { padding: 12px; }
.live-name { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.live-category { font-size: 11px; color: var(--primary); }

/* ===== AI网格 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.ai-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
}
.ai-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.ai-icon { font-size: 40px; margin-bottom: 16px; }
.ai-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.ai-desc { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
.tool-features { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.feature-tag {
  font-size: 12px;
  padding: 3px 10px;
  background: rgba(232,67,122,0.08);
  border: 1px solid rgba(232,67,122,0.2);
  border-radius: 10px;
  color: var(--primary);
}

/* ===== 图集网格 ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.gallery-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform 0.4s ease; }
.gallery-item:hover img { transform: scale(1.08); }
.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 16px;
  opacity: 0;
  transition: var(--transition);
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-title { font-size: 13px; font-weight: 600; color: white; }

/* ===== 专家网格 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.expert-cover { position: relative; height: 180px; overflow: hidden; }
.expert-cover img { width: 100%; height: 100%; object-fit: cover; }
.expert-cover-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,18,48,0.8) 0%, transparent 60%);
}
.expert-body { padding: 20px; }
.expert-name { font-size: 18px; font-weight: 800; margin-bottom: 4px; }
.expert-role { font-size: 12px; color: var(--primary); margin-bottom: 12px; }
.expert-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.expert-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: rgba(168,85,247,0.1);
  border: 1px solid rgba(168,85,247,0.2);
  border-radius: 8px;
  color: var(--secondary);
}
.expert-actions { display: flex; gap: 8px; }
.btn-sm { padding: 6px 14px; border-radius: 8px; font-size: 12px; font-weight: 600; transition: var(--transition); }
.btn-sm-primary { background: var(--gradient-primary); color: white; }
.btn-sm-primary:hover { opacity: 0.9; color: white; }
.btn-sm-outline { background: transparent; border: 1px solid var(--border); color: var(--text-muted); }
.btn-sm-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ===== 合作伙伴 ===== */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.partner-item {
  padding: 12px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-muted);
  transition: var(--transition);
}
.partner-item:hover { border-color: var(--primary); color: var(--text); }

/* ===== 步骤网格 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}
.step-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.step-num {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  color: white;
  margin: 0 auto 16px;
}
.step-title { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.step-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ===== 联系区 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.contact-icon { font-size: 20px; flex-shrink: 0; }
.contact-label { font-size: 11px; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 14px; font-weight: 600; }
.community-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
.community-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}
.community-card:hover { border-color: var(--primary); background: rgba(232,67,122,0.05); }
.community-icon { font-size: 28px; margin-bottom: 8px; }
.community-name { font-size: 13px; font-weight: 700; margin-bottom: 4px; }
.community-desc { font-size: 11px; color: var(--text-muted); }
.qr-group { display: flex; gap: 20px; }
.qr-item { text-align: center; }
.qr-item img { border-radius: var(--radius); border: 1px solid var(--border); }
.qr-label { font-size: 11px; color: var(--text-muted); margin-top: 6px; }

/* ===== 评价网格 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(232,67,122,0.3); transform: translateY(-3px); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 700; }
.review-date { font-size: 11px; color: var(--text-muted); }
.review-stars { color: #FFD700; font-size: 14px; margin-bottom: 12px; }
.review-text { font-size: 13px; color: var(--text-muted); line-height: 1.7; margin-bottom: 12px; }
.review-tag {
  font-size: 11px;
  padding: 3px 10px;
  background: rgba(232,67,122,0.08);
  border: 1px solid rgba(232,67,122,0.2);
  border-radius: 10px;
  color: var(--primary);
}

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,67,122,0.3); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(232,67,122,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--primary);
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: white; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-item.open .faq-answer { max-height: 300px; }
.faq-answer-inner { padding: 0 24px 20px; font-size: 14px; color: var(--text-muted); line-height: 1.8; }

/* ===== 工具网格 ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: var(--transition);
}
.tool-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.tool-icon { font-size: 36px; margin-bottom: 12px; }
.tool-name { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.tool-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; }
.tool-btn {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(232,67,122,0.1);
  border: 1px solid rgba(232,67,122,0.3);
  border-radius: 20px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.tool-btn:hover { background: var(--primary); color: white; border-color: var(--primary); }

/* ===== 帖子卡片 ===== */
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
  cursor: pointer;
}
.post-card:hover { border-color: rgba(232,67,122,0.3); background: rgba(232,67,122,0.02); }
.post-tag {
  padding: 4px 10px;
  background: rgba(168,85,247,0.1);
  border: 1px solid rgba(168,85,247,0.2);
  border-radius: 8px;
  font-size: 11px;
  color: var(--secondary);
  white-space: nowrap;
  flex-shrink: 0;
}
.post-hot-badge {
  padding: 4px 10px;
  background: rgba(255,59,48,0.1);
  border: 1px solid rgba(255,59,48,0.2);
  border-radius: 8px;
  font-size: 11px;
  color: #FF3B30;
  white-space: nowrap;
  flex-shrink: 0;
}
.post-title { flex: 1; font-size: 14px; font-weight: 600; }
.post-meta { display: flex; gap: 16px; font-size: 12px; color: var(--text-muted); white-space: nowrap; }

/* ===== 奖章 ===== */
.award-badge {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(255,159,67,0.1);
  border: 1px solid rgba(255,159,67,0.3);
  border-radius: 8px;
  font-size: 11px;
  color: var(--accent);
}

/* ===== 分享栏 ===== */
.share-bar { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.share-btn {
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
}
.share-btn:hover { transform: translateY(-2px); }
.share-wechat:hover { border-color: #07C160; color: #07C160; background: rgba(7,193,96,0.05); }
.share-weibo:hover { border-color: #E6162D; color: #E6162D; background: rgba(230,22,45,0.05); }
.share-douyin:hover { border-color: #FE2C55; color: #FE2C55; background: rgba(254,44,85,0.05); }
.share-bilibili:hover { border-color: #00A1D6; color: #00A1D6; background: rgba(0,161,214,0.05); }

/* ===== 底部 ===== */
.site-footer {
  background: var(--bg-card2);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .site-logo { text-decoration: none; }
.footer-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
  margin: 14px 0;
}
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.social-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(232,67,122,0.05); }
.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copyright { font-size: 12px; color: var(--text-muted); }
.footer-update {
  font-size: 12px;
  color: var(--text-muted);
  padding: 4px 12px;
  background: rgba(232,67,122,0.05);
  border: 1px solid rgba(232,67,122,0.15);
  border-radius: 8px;
}
.footer-legal { display: flex; gap: 16px; }
.footer-legal a { font-size: 12px; color: var(--text-muted); }
.footer-legal a:hover { color: var(--primary); }

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(4, 1fr); }
  .hero-title { font-size: 42px; }
}

@media (max-width: 992px) {
  .hero-content { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: 1fr 1fr; }
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .main-nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15,10,30,0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 20px;
    z-index: 99;
  }
  .main-nav.open { display: block; }
  .nav-list { flex-direction: column; gap: 4px; }
  .nav-list a { padding: 12px 16px; font-size: 15px; }
  .header-right { display: none; }
  .section-title { font-size: 24px; }
  .hero-title { font-size: 32px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .live-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(4, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .live-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 28px; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .filter-bar { gap: 6px; }
  .filter-btn { padding: 6px 12px; font-size: 12px; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 图片懒加载 ===== */
img[data-src] { opacity: 0; transition: opacity 0.3s ease; }
img[data-src].loaded { opacity: 1; }
img { opacity: 1; }