/* ================================================
   51吃瓜 - 现代极简高端论坛样式
   Modern Minimal High-end Forum CSS
   ================================================ */

/* 全局重置与基础变量 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #1a1a2e;
  --secondary: #16213e;
  --accent: #c9a84c;
  --accent-light: #e8c96d;
  --text-primary: #1a1a2e;
  --text-secondary: #5a5a7a;
  --text-light: #9a9ab0;
  --bg-primary: #ffffff;
  --bg-secondary: #f8f8fc;
  --bg-card: #ffffff;
  --border: #e8e8f0;
  --border-light: #f0f0f8;
  --shadow-sm: 0 2px 8px rgba(26,26,46,0.06);
  --shadow-md: 0 8px 32px rgba(26,26,46,0.10);
  --shadow-lg: 0 20px 60px rgba(26,26,46,0.14);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --max-width: 1200px;
}

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

body {
  font-family: var(--font-main);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

ul { list-style: none; }

/* ================================================
   容器
   ================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ================================================
   顶部导航
   ================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 900;
}

.logo span.brand-name {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.btn-post {
  padding: 9px 22px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-post:hover {
  background: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(201,168,76,0.4);
}

/* ================================================
   搜索框
   ================================================ */
.search-bar-wrap {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
}

.search-bar-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.search-form {
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 600px;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 40px;
  padding: 0 20px;
  gap: 10px;
  transition: var(--transition);
}

.search-form:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(201,168,76,0.12);
}

.search-form input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 0.9rem;
  color: var(--text-primary);
  font-family: var(--font-main);
  padding: 10px 0;
}

.search-form input::placeholder {
  color: var(--text-light);
}

.search-form button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  padding: 4px;
  transition: var(--transition);
}

.search-form button:hover {
  color: var(--accent);
}

.search-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-light);
  flex-wrap: wrap;
}

.search-tags span {
  cursor: pointer;
  padding: 3px 10px;
  background: var(--border-light);
  border-radius: 20px;
  transition: var(--transition);
}

.search-tags span:hover {
  background: var(--accent);
  color: #fff;
}

/* ================================================
   面包屑
   ================================================ */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.82rem;
  color: var(--text-light);
}

.breadcrumb a {
  color: var(--text-light);
}

.breadcrumb a:hover {
  color: var(--accent);
}

.breadcrumb span {
  margin: 0 6px;
}

/* ================================================
   首屏 Banner
   ================================================ */
.hero-section {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--primary);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner_hero.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
  transition: transform 0.6s ease;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.92) 0%, rgba(22,33,62,0.75) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 80px 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: rgba(201,168,76,0.15);
  border: 1px solid rgba(201,168,76,0.3);
  border-radius: 20px;
  color: var(--accent-light);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 24px;
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-content h1 .highlight {
  color: var(--accent-light);
}

.hero-content p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 14px 32px;
  background: var(--accent);
  color: var(--primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201,168,76,0.5);
}

.btn-outline {
  padding: 14px 32px;
  background: transparent;
  color: rgba(255,255,255,0.85);
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

.hero-stats {
  position: absolute;
  bottom: 40px;
  right: 0;
  display: flex;
  gap: 40px;
  z-index: 2;
}

.hero-stat {
  text-align: center;
}

.hero-stat .num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-light);
  line-height: 1;
}

.hero-stat .label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

/* ================================================
   通用区块样式
   ================================================ */
.section {
  padding: 80px 0;
}

.section-sm {
  padding: 48px 0;
}

.section-dark {
  background: var(--primary);
  color: #fff;
}

.section-gray {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header .tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(201,168,76,0.1);
  color: var(--accent);
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-dark .section-header h2 {
  color: #fff;
}

.section-header p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
}

.section-dark .section-header p {
  color: rgba(255,255,255,0.65);
}

.section-header-left {
  text-align: left;
  margin-bottom: 40px;
}

.section-header-left h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 10px;
}

.section-header-left p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ================================================
   品牌介绍
   ================================================ */
.intro-section {
  padding: 80px 0;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.intro-text .tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(201,168,76,0.1);
  color: var(--accent);
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.intro-text h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  line-height: 1.3;
}

.intro-text p {
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 16px;
}

.intro-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}

.intro-feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.intro-feature .icon {
  width: 36px;
  height: 36px;
  background: rgba(201,168,76,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
  font-size: 1rem;
}

.intro-feature .text h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.intro-feature .text p {
  font-size: 0.8rem;
  color: var(--text-light);
  margin: 0;
}

.intro-image {
  position: relative;
}

.intro-image img {
  border-radius: var(--radius-lg);
  width: 100%;
  object-fit: cover;
  aspect-ratio: 4/3;
  box-shadow: var(--shadow-lg);
}

.intro-image-badge {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: var(--accent);
  color: var(--primary);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-weight: 800;
  box-shadow: var(--shadow-md);
}

.intro-image-badge .num {
  font-size: 1.8rem;
  line-height: 1;
}

.intro-image-badge .text {
  font-size: 0.75rem;
  opacity: 0.85;
}

/* ================================================
   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-md);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--primary);
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img {
  transform: scale(1.05);
}

.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(26,26,46,0.3);
  opacity: 0;
  transition: var(--transition);
}

.video-card:hover .video-play-btn {
  opacity: 1;
}

.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.3rem;
  padding-left: 4px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  transform: scale(0.85);
  transition: var(--transition);
}

.video-card:hover .play-icon {
  transform: scale(1);
}

.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(201,168,76,0.9);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
}

.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.78rem;
  color: var(--text-light);
}

.video-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ================================================
   话题卡片
   ================================================ */
.topics-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
}

.topic-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  background: var(--bg-card);
  transition: var(--transition);
  cursor: pointer;
}

.topic-item:hover {
  background: var(--bg-secondary);
}

.topic-num {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--border);
  min-width: 28px;
  text-align: center;
}

.topic-item:nth-child(1) .topic-num { color: #e8b84b; }
.topic-item:nth-child(2) .topic-num { color: #a0a0b8; }
.topic-item:nth-child(3) .topic-num { color: #c07850; }

.topic-content {
  flex: 1;
}

.topic-content h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.topic-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.topic-tag {
  padding: 2px 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.topic-tag.video {
  background: rgba(201,168,76,0.1);
  color: var(--accent);
}

.topic-stats {
  display: flex;
  gap: 20px;
  font-size: 0.8rem;
  color: var(--text-light);
  flex-shrink: 0;
}

.topic-stats span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ================================================
   板块分类网格
   ================================================ */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.category-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
  transition: var(--transition);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.category-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.category-card:hover img {
  transform: scale(1.06);
}

.category-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,26,46,0.85) 0%, transparent 60%);
}

.category-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
}

.category-info h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
}

.category-info p {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.7);
}

.category-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--accent);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
}

/* ================================================
   数据统计
   ================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.stat-item {
  padding: 40px 24px;
  text-align: center;
  background: rgba(255,255,255,0.05);
  transition: var(--transition);
}

.stat-item:hover {
  background: rgba(255,255,255,0.08);
}

.stat-item .num {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--accent-light);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -1px;
}

.stat-item .label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
}

/* ================================================
   用户评价
   ================================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 16px;
  color: var(--accent);
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.review-author-info .name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-primary);
}

.review-author-info .meta {
  font-size: 0.75rem;
  color: var(--text-light);
}

/* ================================================
   FAQ
   ================================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.open {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(201,168,76,0.08);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  background: var(--bg-card);
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--bg-secondary);
}

.faq-question h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1rem;
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-icon {
  background: var(--accent);
  color: var(--primary);
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.open .faq-answer {
  max-height: 200px;
}

.faq-answer p {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  background: var(--bg-card);
}

/* ================================================
   加入我们 / 联系
   ================================================ */
.join-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  padding: 80px 0;
  text-align: center;
}

.join-section h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.join-section p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 40px;
  font-size: 1rem;
}

.join-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
}

.join-form input {
  flex: 1;
  padding: 14px 20px;
  border: 1.5px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.9rem;
  font-family: var(--font-main);
  outline: none;
  transition: var(--transition);
}

.join-form input::placeholder {
  color: rgba(255,255,255,0.4);
}

.join-form input:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.12);
}

.join-form button {
  padding: 14px 28px;
  background: var(--accent);
  color: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: var(--font-main);
}

.join-form button:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

/* ================================================
   页脚
   ================================================ */
.site-footer {
  background: var(--primary);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand .logo .brand-name {
  -webkit-text-fill-color: #fff;
}

.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.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: 0.85rem;
  transition: var(--transition);
  cursor: pointer;
  color: rgba(255,255,255,0.7);
}

.social-btn:hover {
  background: var(--accent);
  color: var(--primary);
}

.footer-col h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.55);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--accent-light);
}

.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.35);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom a {
  color: rgba(255,255,255,0.35);
}

.footer-bottom a:hover {
  color: var(--accent-light);
}

/* ================================================
   内页通用
   ================================================ */
.page-hero {
  background: var(--primary);
  padding: 60px 0;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}

.page-hero p {
  color: rgba(255,255,255,0.65);
  font-size: 1rem;
}

.page-content {
  padding: 60px 0;
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

/* 侧边栏 */
.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
}

.sidebar-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.sidebar-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-list li:last-child {
  border-bottom: none;
}

.sidebar-list li a {
  color: var(--text-secondary);
  flex: 1;
}

.sidebar-list li a:hover {
  color: var(--accent);
}

.sidebar-list li .count {
  font-size: 0.75rem;
  color: var(--text-light);
  background: var(--bg-secondary);
  padding: 2px 8px;
  border-radius: 10px;
}

/* 排行榜 */
.rank-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.rank-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.rank-num {
  font-size: 1.2rem;
  font-weight: 800;
  min-width: 28px;
  text-align: center;
  color: var(--text-light);
}

.rank-item:nth-child(1) .rank-num { color: #e8b84b; }
.rank-item:nth-child(2) .rank-num { color: #a0a0b8; }
.rank-item:nth-child(3) .rank-num { color: #c07850; }

.rank-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.rank-info {
  flex: 1;
}

.rank-info .name {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.rank-info .meta {
  font-size: 0.75rem;
  color: var(--text-light);
}

.rank-score {
  font-size: 1rem;
  font-weight: 800;
  color: var(--accent);
}

/* ================================================
   移动端菜单
   ================================================ */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--text-primary);
  font-size: 1.3rem;
}

.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(26,26,46,0.95);
  z-index: 9999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

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

.mobile-nav a {
  font-size: 1.3rem;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  transition: var(--transition);
}

.mobile-nav a:hover {
  color: var(--accent-light);
}

.mobile-nav-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: none;
  border: none;
  color: rgba(255,255,255,0.7);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ================================================
   动画
   ================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }

/* ================================================
   响应式
   ================================================ */
@media (max-width: 1024px) {
  .intro-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .content-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav,
  .header-actions {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-stats {
    display: none;
  }

  .hero-content {
    padding: 60px 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .join-form {
    flex-direction: column;
  }

  .section {
    padding: 56px 0;
  }

  .video-grid {
    grid-template-columns: 1fr 1fr;
  }

  .categories-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .video-grid {
    grid-template-columns: 1fr;
  }

  .categories-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

/* ================================================
   懒加载
   ================================================ */
img[data-src] {
  opacity: 0;
  transition: opacity 0.4s ease;
}

img.loaded {
  opacity: 1;
}

/* ================================================
   滚动条美化
   ================================================ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ================================================
   选中文字样式
   ================================================ */
::selection {
  background: rgba(201,168,76,0.2);
  color: var(--primary);
}