/* ===== 溏心vlog - 主样式 ===== */
/* 原创配色：深夜蓝 #0d1117 + 火焰橙 #ff6b00 + 钢铁银 #c0c0c0 */

:root {
  --primary: #ff6b00;
  --primary-dark: #cc5500;
  --primary-light: #ff8c33;
  --bg-dark: #0d1117;
  --bg-card: #161b22;
  --bg-section: #0f1419;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --border: #30363d;
  --border-light: #21262d;
  --accent: #58a6ff;
  --success: #3fb950;
  --gradient-hero: linear-gradient(135deg, #0d1117 0%, #1a0a00 50%, #0d1117 100%);
  --gradient-card: linear-gradient(145deg, #161b22, #0d1117);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-hover: 0 16px 48px rgba(255,107,0,0.2);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s 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: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(13,17,23,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -1px;
  flex-shrink: 0;
}

.site-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
  font-weight: 900;
}

/* Logo图片样式 */
.logo-img {
  width: 48px;
  height: 32px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  line-height: 1;
}

.logo-text em {
  font-style: normal;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  display: block;
  margin-top: 1px;
}

.site-logo span { color: var(--text-primary); }

/* 页脚 Logo */
.footer-logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  text-decoration: none;
}

.footer-logo-img {
  width: 80px;
  height: 53px;
  object-fit: contain;
}

.footer-logo-text {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--primary);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.main-nav a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: rgba(255,107,0,0.1);
}

/* ===== 搜索框 ===== */
.header-search {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.search-box {
  position: relative;
}

.search-box input {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 16px 6px 36px;
  color: var(--text-primary);
  font-size: 0.85rem;
  width: 200px;
  outline: none;
  transition: var(--transition);
}

.search-box input:focus {
  border-color: var(--primary);
  width: 240px;
  box-shadow: 0 0 0 3px rgba(255,107,0,0.1);
}

.search-box input::placeholder { color: var(--text-muted); }

.search-box .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.search-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.search-btn:hover { background: var(--primary-dark); }

/* ===== 搜索结果提示 ===== */
.search-tips {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  z-index: 100;
  box-shadow: var(--shadow-card);
}

.search-box input:focus ~ .search-tips { display: block; }

/* ===== 导航下方搜索栏（宽版） ===== */
.nav-search-bar {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border-light);
  padding: 10px 0;
}

.nav-search-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-search-inner .search-full {
  flex: 1;
  max-width: 600px;
  position: relative;
}

.nav-search-inner .search-full input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 8px 20px 8px 42px;
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.nav-search-inner .search-full input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,107,0,0.1);
}

.nav-search-inner .search-full .si {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.nav-search-inner .search-full input::placeholder { color: var(--text-muted); }

.nav-search-inner .sbtn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 24px;
  padding: 8px 24px;
  font-size: 0.9rem;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.nav-search-inner .sbtn:hover { background: var(--primary-dark); transform: translateY(-1px); }

.nav-search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-search-tags a {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 3px 10px;
  transition: var(--transition);
}

.nav-search-tags a:hover {
  color: var(--primary);
  border-color: var(--primary);
}

/* ===== 汉堡菜单 ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero Banner ===== */
.hero-banner {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/images/banner-hero.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.35);
  transform: scale(1.05);
  transition: transform 8s ease;
}

.hero-banner:hover .hero-bg { transform: scale(1); }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,17,23,0.8) 0%, rgba(255,107,0,0.1) 50%, rgba(13,17,23,0.9) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,107,0,0.15);
  border: 1px solid rgba(255,107,0,0.3);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--primary);
  margin-bottom: 24px;
  animation: fadeInDown 0.6s ease;
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 16px;
  animation: fadeInUp 0.7s ease 0.1s both;
}

.hero-title .brand { color: var(--primary); }

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
  animation: fadeInUp 0.7s ease 0.2s both;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-bottom: 40px;
  animation: fadeInUp 0.7s ease 0.3s both;
}

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

.hero-stat .num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
  display: block;
}

.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.7s ease 0.4s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,107,0,0.4);
  color: #fff;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  padding: 14px 32px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

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

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-tag {
  display: inline-block;
  background: rgba(255,107,0,0.1);
  border: 1px solid rgba(255,107,0,0.25);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.section-title .accent { color: var(--primary); }

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== 卡片网格 ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

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

.card-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

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

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

.card-body { padding: 20px; }

.card-tag {
  font-size: 0.72rem;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
  line-height: 1.4;
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

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

/* ===== 视频卡片 ===== */
.video-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

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

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #000;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease, filter 0.3s ease;
}

.video-card:hover .video-thumb img {
  transform: scale(1.05);
  filter: brightness(0.7);
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(255,107,0,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}

.play-btn::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

.video-card:hover .play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.video-views {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
}

.video-info { padding: 16px; }

.video-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.video-stats { display: flex; gap: 12px; }

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

/* ===== 专家卡片 ===== */
.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  text-align: center;
}

.expert-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.expert-avatar {
  position: relative;
  width: 100px;
  height: 100px;
  margin: 24px auto 16px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--primary);
}

.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }

.expert-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.expert-role {
  font-size: 0.82rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}

.expert-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 0 20px;
  margin-bottom: 16px;
  line-height: 1.6;
}

.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  padding: 0 16px;
  margin-bottom: 16px;
}

.expert-tag {
  font-size: 0.72rem;
  background: rgba(255,107,0,0.1);
  color: var(--primary);
  border: 1px solid rgba(255,107,0,0.2);
  padding: 2px 10px;
  border-radius: 12px;
}

.expert-actions {
  display: flex;
  gap: 8px;
  padding: 16px;
  border-top: 1px solid var(--border);
}

.expert-actions a {
  flex: 1;
  text-align: center;
  padding: 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
}

.expert-actions .btn-contact {
  background: var(--primary);
  color: #fff;
}

.expert-actions .btn-contact:hover { background: var(--primary-dark); }

.expert-actions .btn-works {
  background: var(--bg-dark);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.expert-actions .btn-works:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ===== 评论区 ===== */
.review-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1rem;
  flex-shrink: 0;
}

.review-name { font-weight: 700; font-size: 0.95rem; }

.review-date { font-size: 0.75rem; color: var(--text-muted); }

.review-stars { color: #f5a623; font-size: 0.85rem; letter-spacing: 1px; }

.review-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.review-tag {
  font-size: 0.72rem;
  color: var(--primary);
  background: rgba(255,107,0,0.08);
  border: 1px solid rgba(255,107,0,0.15);
  padding: 2px 10px;
  border-radius: 12px;
  display: inline-block;
}

/* ===== FAQ ===== */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover { border-color: rgba(255,107,0,0.3); }

.faq-question {
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--bg-card);
  transition: var(--transition);
  user-select: none;
}

.faq-question:hover { color: var(--primary); }

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255,107,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1rem;
  transition: var(--transition);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  background: var(--bg-dark);
}

.faq-answer-inner {
  padding: 16px 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border);
}

.faq-item.open .faq-answer { max-height: 400px; }

/* ===== 合作品牌墙 ===== */
.brand-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}

.brand-logo {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
  letter-spacing: 1px;
}

.brand-logo:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

/* ===== 社区加入指南 ===== */
.join-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.join-step {
  text-align: center;
  padding: 32px 20px;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  transition: var(--transition);
}

.join-step:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.step-num {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 16px;
}

.step-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== 联系区域 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.contact-info {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.contact-info h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--primary);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}

.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(255,107,0,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1rem;
  flex-shrink: 0;
}

.contact-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.contact-value {
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* ===== 二维码 ===== */
.qr-grid {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.qr-item {
  text-align: center;
}

.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  margin: 0 auto 8px;
}

.qr-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== 分享按钮 ===== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.share-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }

.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #000; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; color: #fff; }

/* ===== AI赋能区 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ai-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.ai-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.ai-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.ai-icon {
  width: 52px;
  height: 52px;
  background: rgba(255,107,0,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.ai-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.ai-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 数据统计 ===== */
.stats-bar {
  background: linear-gradient(135deg, #1a0a00, #0d1117);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 40px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item .num {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary);
  display: block;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-item .label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--text-primary); }

/* ===== 页脚 ===== */
.site-footer {
  background: #080c10;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}

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

.footer-brand .logo {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.footer-col ul { list-style: none; }

.footer-col ul li { margin-bottom: 8px; }

.footer-col ul li a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer-links a:hover { color: var(--primary); }

/* ===== 内页头部 ===== */
.page-hero {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--bg-dark) 0%, #1a0a00 100%);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,107,0,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 600;
}

.tag-orange { background: rgba(255,107,0,0.12); color: var(--primary); border: 1px solid rgba(255,107,0,0.2); }
.tag-blue { background: rgba(88,166,255,0.1); color: var(--accent); border: 1px solid rgba(88,166,255,0.2); }
.tag-green { background: rgba(63,185,80,0.1); color: var(--success); border: 1px solid rgba(63,185,80,0.2); }

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.pagination a, .pagination span {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: var(--transition);
}

.pagination a:hover, .pagination .current {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .header-search { display: none; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .hero-stat .num { font-size: 1.5rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .join-steps { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .nav-search-bar { display: none; }
  .mobile-nav-open .main-nav {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    padding: 16px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-outline { justify-content: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}