/* ===== 17C 品牌官网主样式 ===== */
:root {
  --primary: #00d4ff;
  --primary-dark: #0099cc;
  --secondary: #7c3aed;
  --accent: #f59e0b;
  --dark: #0a0e1a;
  --dark2: #0f1629;
  --dark3: #1a2035;
  --card-bg: #141928;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --border: rgba(0,212,255,0.15);
  --gradient: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
  --gradient2: linear-gradient(135deg, #0a0e1a 0%, #1a2035 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,212,255,0.1);
  --shadow-lg: 0 8px 48px rgba(0,212,255,0.15);
  --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','Helvetica Neue',Arial,sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: #fff; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark2); }
::-webkit-scrollbar-thumb { background: var(--primary-dark); border-radius: 3px; }

/* ===== 通用容器 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }

/* ===== 标题样式 ===== */
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 56px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,212,255,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,212,255,0.4);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: var(--dark);
}
.btn-ghost {
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: rgba(255,255,255,0.15); color: #fff; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 20px;
  background: rgba(10,14,26,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 68px;
  gap: 24px;
}
.navbar-logo {
  font-size: 1.8rem;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
  flex-shrink: 0;
}
.navbar-logo span { font-size: 0.75rem; font-weight: 400; color: var(--text-muted); display: block; -webkit-text-fill-color: var(--text-muted); margin-top: -4px; }
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.navbar-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  white-space: nowrap;
}
.navbar-nav a:hover, .navbar-nav a.active {
  color: var(--primary);
  background: rgba(0,212,255,0.08);
}
.navbar-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.navbar-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.navbar-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* ===== 搜索框 ===== */
.search-bar {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 180px;
  transition: var(--transition);
}
.search-bar:focus-within {
  border-color: var(--primary);
  background: rgba(0,212,255,0.05);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
}
.search-bar input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.88rem;
  width: 100%;
}
.search-bar input::placeholder { color: var(--text-muted); }
.search-bar svg { color: var(--text-muted); flex-shrink: 0; }

/* 搜索结果提示 */
.search-hint {
  position: absolute;
  top: 100%;
  left: 0; right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: none;
  z-index: 100;
  margin-top: 4px;
}
.search-wrap { position: relative; }
.search-wrap.active .search-hint { display: block; }

/* ===== Hero Banner ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 68px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('../images/banner-hero.jpg') center/cover no-repeat;
  filter: brightness(0.35);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,14,26,0.8) 0%, rgba(124,58,237,0.2) 50%, rgba(0,212,255,0.1) 100%);
  z-index: 1;
}
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 3;
  max-width: 800px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.3);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 24px;
  animation: fadeInUp 0.6s ease both;
}
.hero-badge::before { content: ''; width: 8px; height: 8px; background: var(--primary); border-radius: 50%; animation: pulse 2s infinite; }
.hero-title {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  animation: fadeInUp 0.6s 0.1s ease both;
}
.hero-title .brand { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 600px;
  animation: fadeInUp 0.6s 0.2s ease both;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s 0.3s ease both;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 60px;
  animation: fadeInUp 0.6s 0.4s ease both;
  flex-wrap: wrap;
}
.hero-stat-item { text-align: center; }
.hero-stat-num { font-size: 2rem; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-stat-label { font-size: 0.85rem; color: var(--text-muted); }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,212,255,0.3);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.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-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-icon {
  width: 60px;
  height: 60px;
  background: rgba(0,212,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon svg { width: 24px; height: 24px; color: #fff; margin-left: 4px; }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--gradient);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 50px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 14px; height: 14px; }

/* ===== 卡片通用 ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 32px;
  transition: var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(0,212,255,0.25);
}
.card-icon {
  width: 56px;
  height: 56px;
  background: rgba(0,212,255,0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}
.card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.card-text { color: var(--text-muted); font-size: 0.92rem; line-height: 1.7; }

/* ===== 品牌故事 ===== */
.brand-story-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.brand-story-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}
.brand-story-img img { width: 100%; height: 400px; object-fit: cover; }
.brand-story-img::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0,212,255,0.2);
  pointer-events: none;
}
.brand-story-content h2 { font-size: 2rem; font-weight: 800; margin-bottom: 20px; }
.brand-story-content p { color: var(--text-muted); margin-bottom: 16px; line-height: 1.8; }
.brand-values { display: flex; flex-direction: column; gap: 16px; margin-top: 28px; }
.brand-value-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background: rgba(0,212,255,0.04);
  border-radius: var(--radius);
  border-left: 3px solid var(--primary);
}
.brand-value-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 2px; }
.brand-value-text h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.brand-value-text p { font-size: 0.85rem; color: var(--text-muted); margin: 0; }

/* ===== 服务/探索模块 ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

/* ===== 案例/创造模块 ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-img { aspect-ratio: 16/9; overflow: hidden; }
.case-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.case-card:hover .case-img img { transform: scale(1.05); }
.case-info { padding: 20px; }
.case-tag {
  display: inline-block;
  background: rgba(0,212,255,0.1);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 50px;
  margin-bottom: 10px;
}
.case-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.case-desc { font-size: 0.85rem; color: var(--text-muted); }

/* ===== 灵感/趋势模块 ===== */
.inspire-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}
.inspire-main {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.inspire-main-img { height: 300px; overflow: hidden; }
.inspire-main-img img { width: 100%; height: 100%; object-fit: cover; }
.inspire-main-info { padding: 28px; }
.inspire-list { display: flex; flex-direction: column; gap: 16px; }
.inspire-item {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.inspire-item:hover { border-color: rgba(0,212,255,0.3); }
.inspire-item-title { font-size: 0.9rem; font-weight: 600; margin-bottom: 6px; }
.inspire-item-meta { font-size: 0.78rem; color: var(--text-muted); }

/* ===== 用户评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.review-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 4rem;
  color: rgba(0,212,255,0.1);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-stars { color: var(--accent); font-size: 1rem; margin-bottom: 14px; }
.review-text { font-size: 0.92rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-weight: 600; font-size: 0.9rem; }
.review-role { font-size: 0.78rem; color: var(--text-muted); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-question .faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(0,212,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  font-size: 1rem;
}
.faq-item.open .faq-icon { background: var(--primary); color: var(--dark); transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }

/* ===== 联系模块 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item { display: flex; align-items: flex-start; gap: 16px; }
.contact-icon {
  width: 48px;
  height: 48px;
  background: rgba(0,212,255,0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 4px; }
.contact-value { font-weight: 600; font-size: 0.95rem; }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }
.form-input, .form-textarea {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
  resize: none;
}
.form-input:focus, .form-textarea:focus {
  border-color: var(--primary);
  background: rgba(0,212,255,0.04);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
}
.form-textarea { min-height: 120px; }

/* ===== 地图占位 ===== */
.map-placeholder {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  flex-direction: column;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 32px;
}
.map-placeholder .map-icon { font-size: 2.5rem; }

/* ===== 合作伙伴 ===== */
.partners-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}
.partner-logo {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
}
.partner-logo:hover { color: var(--primary); border-color: rgba(0,212,255,0.3); }

/* ===== 信任徽章 ===== */
.trust-badges {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 40px;
}
.trust-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 8px 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.trust-badge .badge-icon { font-size: 1rem; }

/* ===== 页脚 ===== */
.footer {
  background: var(--dark2);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand-name {
  font-size: 2rem;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.footer-brand-desc { color: var(--text-muted); font-size: 0.88rem; line-height: 1.7; margin-bottom: 20px; }
.footer-qr-row { display: flex; gap: 16px; }
.footer-qr {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.footer-qr-box {
  width: 80px;
  height: 80px;
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 6px;
  border: 1px solid var(--border);
}
.footer-col-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 16px; color: var(--text); }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.85rem; 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-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copyright { font-size: 0.82rem; color: var(--text-muted); }
.footer-social { display: flex; gap: 12px; }
.social-link {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.06);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.social-link:hover { background: rgba(0,212,255,0.1); color: var(--primary); border-color: rgba(0,212,255,0.3); }
.footer-icp { font-size: 0.78rem; color: var(--text-muted); }
.footer-update { font-size: 0.78rem; color: var(--text-muted); }

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.animate-float { animation: float 3s ease-in-out infinite; }
.animate-fade-in { animation: fadeIn 0.6s ease both; }

/* 滚动触发动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== 渐变分隔线 ===== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  margin: 0;
  opacity: 0.3;
}

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  background: rgba(0,212,255,0.1);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 50px;
  border: 1px solid rgba(0,212,255,0.2);
}
.tag-purple { background: rgba(124,58,237,0.1); color: #a78bfa; border-color: rgba(124,58,237,0.2); }
.tag-amber { background: rgba(245,158,11,0.1); color: var(--accent); border-color: rgba(245,158,11,0.2); }

/* ===== 数据统计栏 ===== */
.stats-bar {
  background: var(--dark3);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 40px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item .stat-num {
  font-size: 2.2rem;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-item .stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* ===== 内页 Banner ===== */
.page-hero {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark3) 100%);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,212,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.page-hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  margin-bottom: 16px;
}
.page-hero-desc { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { color: var(--text-muted); }

/* ===== 移动端菜单 ===== */
.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0; right: 0;
  background: rgba(10,14,26,0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  padding: 20px;
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  gap: 4px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  display: block;
}
.mobile-menu a:hover { color: var(--primary); background: rgba(0,212,255,0.08); }
.mobile-search { margin-top: 12px; }

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

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .navbar-nav { display: none; }
  .navbar-toggle { display: flex; }
  .search-bar { display: none; }
  .brand-story-grid { grid-template-columns: 1fr; gap: 32px; }
  .cases-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-stats { gap: 24px; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .partners-row { gap: 16px; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 2.2rem; }
}

/* ===== 懒加载占位 ===== */
img[loading="lazy"] { background: var(--card-bg); }

/* ===== 滚动进度条 ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--gradient);
  z-index: 9999;
  transition: width 0.1s;
}

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 100;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0,212,255,0.3);
  border: none;
  color: #fff;
  font-size: 1.2rem;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); }

/* ===== 加载动画 ===== */
.skeleton {
  background: linear-gradient(90deg, var(--card-bg) 25%, rgba(255,255,255,0.04) 50%, var(--card-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius);
}

/* ===== 视频播放模态框 ===== */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: var(--dark2);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 800px;
  width: 100%;
  position: relative;
  border: 1px solid var(--border);
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.1);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.video-modal-close:hover { background: rgba(255,255,255,0.2); }
.video-player-wrap { aspect-ratio: 16/9; background: #000; border-radius: var(--radius); overflow: hidden; margin-top: 8px; display: flex; align-items: center; justify-content: center; }
.video-player-placeholder { color: var(--text-muted); text-align: center; }
.video-player-placeholder .play-big { font-size: 4rem; margin-bottom: 12px; }

/* ===== 热帖列表 ===== */
.hot-posts { display: flex; flex-direction: column; gap: 12px; }
.hot-post-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.hot-post-item:hover { border-color: rgba(0,212,255,0.3); transform: translateX(4px); }
.hot-rank {
  font-size: 1.2rem;
  font-weight: 900;
  min-width: 28px;
  text-align: center;
  color: var(--text-muted);
}
.hot-rank.top1 { color: #ef4444; }
.hot-rank.top2 { color: #f97316; }
.hot-rank.top3 { color: var(--accent); }
.hot-post-content { flex: 1; }
.hot-post-title { font-size: 0.92rem; font-weight: 600; margin-bottom: 6px; }
.hot-post-meta { font-size: 0.78rem; color: var(--text-muted); display: flex; gap: 12px; }
.hot-post-heat { font-size: 0.78rem; color: #ef4444; font-weight: 600; white-space: nowrap; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: linear-gradient(90deg, rgba(0,212,255,0.08) 0%, rgba(124,58,237,0.08) 100%);
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

/* ===== 新版导航 (header/nav) ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10,14,26,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  height: 72px;
  display: flex;
  align-items: center;
  transition: background 0.3s;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.5px;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-brand {
  font-size: 1.2rem;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-tagline { font-size: 0.65rem; color: var(--text-muted); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: center;
  list-style: none;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 7px 11px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 8px;
  transition: all 0.3s;
  white-space: nowrap;
}
.nav-link:hover { color: var(--primary); background: rgba(0,212,255,0.08); }
.nav-dropdown { position: relative; }
.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  min-width: 260px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  z-index: 100;
}
.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  transition: background 0.3s;
  color: var(--text);
}
.dropdown-item:hover { background: rgba(0,212,255,0.08); color: var(--primary); }
.dropdown-icon { font-size: 1.4rem; flex-shrink: 0; }
.dropdown-title { font-size: 0.88rem; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.dropdown-desc { font-size: 0.75rem; color: var(--text-muted); }
.nav-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s;
  border: none;
  background: none;
}
.mobile-menu-btn:hover { background: rgba(0,212,255,0.08); }
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}
.mobile-nav-link {
  display: block;
  padding: 12px 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: color 0.3s;
}
.mobile-nav-link:hover { color: var(--primary); }

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: flex; }
  .top-bar-inner { flex-direction: column; gap: 4px; text-align: center; font-size: 0.75rem; }
}