/* =============================================
   51吃瓜 - 主样式文件
   现代极简高端风格
   ============================================= */

/* CSS变量 */
:root {
  --color-bg: #0a0a0f;
  --color-bg2: #111118;
  --color-bg3: #16161f;
  --color-surface: #1c1c28;
  --color-border: rgba(255,255,255,0.08);
  --color-primary: #e8b84b;
  --color-primary-dark: #c99a30;
  --color-text: #f0f0f5;
  --color-text-muted: #8888a0;
  --color-text-dim: #555568;
  --color-accent: #4a9eff;
  --font-main: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.6);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1280px;
}

/* 基础重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

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

/* =============================================
   顶部导航
   ============================================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 900; color: #0a0a0f;
}
.logo-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--color-text);
}
.logo-text span { color: var(--color-primary); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.site-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: var(--transition);
  white-space: nowrap;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--color-text);
  background: var(--color-surface);
}

/* 搜索框 */
.header-search {
  position: relative;
  flex: 1;
  max-width: 320px;
}
.header-search input {
  width: 100%;
  padding: 9px 16px 9px 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  color: var(--color-text);
  font-size: 14px;
  font-family: var(--font-main);
  outline: none;
  transition: var(--transition);
}
.header-search input::placeholder { color: var(--color-text-dim); }
.header-search input:focus {
  border-color: var(--color-primary);
  background: var(--color-bg3);
}
.search-icon {
  position: absolute;
  left: 14px; top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-dim);
  font-size: 15px;
  pointer-events: none;
}
.search-suggestions {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  overflow: hidden;
}
.search-suggestions.show { display: block; }
.search-suggestion-item {
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: var(--transition);
  display: flex; align-items: center; gap: 10px;
}
.search-suggestion-item:hover {
  background: var(--color-bg3);
  color: var(--color-text);
}
.search-suggestion-item::before {
  content: '🔍';
  font-size: 12px;
}

/* 搜索框下方导航条 */
.sub-nav {
  background: var(--color-bg2);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
  margin-top: 68px;
}
.sub-nav-inner {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.sub-nav-inner::-webkit-scrollbar { display: none; }
.sub-nav a {
  padding: 10px 18px;
  font-size: 13px;
  color: var(--color-text-muted);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}
.sub-nav a:hover, .sub-nav a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* 汉堡菜单 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* =============================================
   首屏Banner
   ============================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 100px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0a0a0f 0%, #0d1020 40%, #0a0a0f 100%);
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.25;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 60%, rgba(232,184,75,0.08) 0%, transparent 70%);
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 24px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(232,184,75,0.12);
  border: 1px solid rgba(232,184,75,0.3);
  border-radius: 24px;
  font-size: 13px;
  color: var(--color-primary);
  margin-bottom: 28px;
  animation: fadeInDown 0.8s ease both;
}
.hero-badge-dot {
  width: 6px; height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s 0.1s ease both;
}
.hero h1 .highlight { color: var(--color-primary); }
.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  margin-bottom: 40px;
  line-height: 1.8;
  animation: fadeInUp 0.8s 0.2s ease both;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.3s ease both;
}
.btn-primary {
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #0a0a0f;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(232,184,75,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(232,184,75,0.4);
}
.btn-outline {
  padding: 14px 32px;
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(232,184,75,0.05);
}
.hero-stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
  animation: fadeInUp 0.8s 0.4s ease both;
}
.hero-stat-item { text-align: center; }
.hero-stat-value {
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}
.hero-stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 6px;
}
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-dim);
  font-size: 12px;
  animation: bounce 2s infinite;
}
.hero-scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid var(--color-text-dim);
  border-bottom: 2px solid var(--color-text-dim);
  transform: rotate(45deg);
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* =============================================
   通用区块样式
   ============================================= */
.section {
  padding: 100px 0;
}
.section-alt { background: var(--color-bg2); }
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(232,184,75,0.1);
  border: 1px solid rgba(232,184,75,0.2);
  border-radius: 20px;
  font-size: 12px;
  color: var(--color-primary);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.3;
}
.section-title span { color: var(--color-primary); }
.section-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* =============================================
   品牌介绍
   ============================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.about-img-wrap img {
  width: 100%;
  border-radius: var(--radius-lg);
  transition: transform 0.6s ease;
}
.about-img-wrap:hover img { transform: scale(1.03); }
.about-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,10,15,0.6) 0%, transparent 60%);
  border-radius: var(--radius-lg);
}
.about-content { padding: 20px 0; }
.about-content h2 {
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}
.about-content p {
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: 16px;
}
.about-features {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.about-feature {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.about-feature-icon {
  width: 40px; height: 40px;
  background: rgba(232,184,75,0.1);
  border: 1px solid rgba(232,184,75,0.2);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.about-feature-text h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}
.about-feature-text p {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
}

/* =============================================
   服务/产品卡片
   ============================================= */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0;
  transition: var(--transition);
}
.service-card:hover {
  border-color: rgba(232,184,75,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.service-card:hover::before { opacity: 1; }
.service-icon {
  width: 52px; height: 52px;
  background: rgba(232,184,75,0.1);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}
.service-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 12px;
}
.service-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* =============================================
   视频卡片
   ============================================= */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  border-color: rgba(232,184,75,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-bg3);
}
.video-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-circle {
  width: 60px; height: 60px;
  background: rgba(232,184,75,0.9);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(232,184,75,0.4);
}
.video-card:hover .play-circle { transform: scale(1); }
.play-triangle {
  width: 0; height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 18px solid #0a0a0f;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 10px; right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-category-badge {
  position: absolute;
  top: 10px; left: 10px;
  background: rgba(232,184,75,0.9);
  color: #0a0a0f;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
}
.video-info {
  padding: 18px 20px 20px;
}
.video-info h3 {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--color-text-dim);
}
.video-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* =============================================
   数据统计
   ============================================= */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat-item {
  background: var(--color-surface);
  padding: 48px 32px;
  text-align: center;
  transition: var(--transition);
}
.stat-item:hover { background: var(--color-bg3); }
.stat-value {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 12px;
}
.stat-label {
  font-size: 14px;
  color: var(--color-text-muted);
}
.stat-icon {
  font-size: 28px;
  margin-bottom: 16px;
}

/* =============================================
   用户评价
   ============================================= */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.testimonial-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}
.testimonial-card:hover {
  border-color: rgba(232,184,75,0.2);
  transform: translateY(-2px);
}
.testimonial-stars {
  color: var(--color-primary);
  font-size: 14px;
  margin-bottom: 14px;
  letter-spacing: 2px;
}
.testimonial-text {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}
.testimonial-text::before { content: '"'; color: var(--color-primary); font-size: 20px; }
.testimonial-text::after { content: '"'; color: var(--color-primary); font-size: 20px; }
.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #0a0a0f;
  flex-shrink: 0;
}
.testimonial-name {
  font-size: 14px;
  font-weight: 600;
}
.testimonial-tag {
  font-size: 12px;
  color: var(--color-text-dim);
}

/* =============================================
   FAQ
   ============================================= */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,184,75,0.3); }
.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition);
}
.faq-question:hover { color: var(--color-primary); }
.faq-icon {
  width: 28px; height: 28px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-size: 18px;
  color: var(--color-text-muted);
  transition: var(--transition);
}
.faq-item.open .faq-icon {
  background: rgba(232,184,75,0.1);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-item.open .faq-answer { max-height: 300px; }
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.9;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

/* =============================================
   联系我们
   ============================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  align-items: start;
}
.contact-info h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 800;
  margin-bottom: 16px;
}
.contact-info p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}
.contact-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.contact-item-icon {
  width: 44px; height: 44px;
  background: rgba(232,184,75,0.1);
  border: 1px solid rgba(232,184,75,0.2);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-item-text h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}
.contact-item-text p {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
}
.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg3);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text);
  font-size: 14px;
  font-family: var(--font-main);
  outline: none;
  transition: var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* =============================================
   社交媒体
   ============================================= */
.social-grid {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.social-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
}
.social-card:hover {
  border-color: rgba(232,184,75,0.3);
  transform: translateY(-2px);
  background: var(--color-bg3);
}
.social-icon { font-size: 22px; }
.social-name { font-size: 14px; font-weight: 500; }

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--color-bg2);
  border-top: 1px solid var(--color-border);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-top: 16px;
  max-width: 280px;
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-text);
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul li a {
  font-size: 13px;
  color: var(--color-text-muted);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--color-primary); }
.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-copyright {
  font-size: 13px;
  color: var(--color-text-dim);
}
.footer-copyright a { color: var(--color-primary); }
.footer-update {
  font-size: 12px;
  color: var(--color-text-dim);
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: 13px;
  color: var(--color-text-dim);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--color-text-muted); }

/* =============================================
   动画
   ============================================= */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   内页通用
   ============================================= */
.page-hero {
  padding: 140px 0 80px;
  background: var(--color-bg2);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 16px;
}
.page-hero p {
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-dim);
  margin-bottom: 20px;
  justify-content: center;
}
.breadcrumb a { color: var(--color-text-muted); transition: var(--transition); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { color: var(--color-text-dim); }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .site-nav { display: none; }
  .site-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px;
    z-index: 999;
  }
  .menu-toggle { display: flex; }
  .header-search { max-width: 200px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .video-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-outline { width: 100%; text-align: center; }
  .stats-grid { grid-template-columns: 1fr; }
}