/* ===================================================
   开云体育官网 - 主样式文件
   kaiyun.com | KAIYUN SPORTS
   =================================================== */

/* --- 全局重置与基础 --- */
*, *::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;
  color: #e0e6f0;
  background-color: #0a0e1a;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color 0.3s; }
a:hover { color: #ff6d00; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* --- CSS变量 --- */
:root {
  --primary: #1565c0;
  --primary-dark: #0d47a1;
  --accent: #ff6d00;
  --accent-light: #ff9800;
  --bg-dark: #0a0e1a;
  --bg-card: #111827;
  --bg-card2: #161d2e;
  --text-main: #e0e6f0;
  --text-muted: #8892a4;
  --border: rgba(255,255,255,0.08);
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --transition: 0.3s ease;
}

/* --- 容器 --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  color: #fff;
  letter-spacing: 0.02em;
}
.section-title span { color: var(--accent); }
.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 50px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.section-divider {
  width: 60px; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  margin: 16px auto 40px;
  border-radius: 2px;
}

/* ===================================================
   HEADER & NAVIGATION
   =================================================== */
#header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,14,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
#header.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.5); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px; padding: 0 20px;
  max-width: 1280px; margin: 0 auto;
}
.logo a { display: flex; align-items: center; gap: 10px; }
.logo img { height: 44px; width: auto; }
.logo-text { font-size: 1.2rem; font-weight: 700; color: #fff; }

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px; border-radius: 8px;
  font-size: 0.95rem; font-weight: 500; color: var(--text-main);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: rgba(21,101,192,0.2); color: var(--accent);
}
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--accent)) !important;
  color: #fff !important; padding: 8px 20px !important;
  border-radius: 20px !important; font-weight: 600 !important;
}
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

/* 搜索框 */
.search-bar {
  display: flex; align-items: center;
  background: rgba(255,255,255,0.06); border: 1px solid var(--border);
  border-radius: 20px; padding: 6px 14px; gap: 8px;
  transition: border-color var(--transition);
}
.search-bar:focus-within { border-color: var(--primary); }
.search-bar input {
  background: none; border: none; outline: none;
  color: var(--text-main); font-size: 0.88rem; width: 160px;
}
.search-bar input::placeholder { color: var(--text-muted); }
.search-bar button {
  background: none; border: none; cursor: pointer;
  color: var(--text-muted); display: flex; align-items: center;
  transition: color var(--transition);
}
.search-bar button:hover { color: var(--accent); }
.search-results {
  position: absolute; top: 70px; right: 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px; min-width: 280px;
  box-shadow: var(--shadow); display: none; z-index: 999;
}
.search-results.show { display: block; }
.search-result-item {
  padding: 10px 12px; border-radius: 8px; cursor: pointer;
  transition: background var(--transition); font-size: 0.9rem;
}
.search-result-item:hover { background: rgba(255,255,255,0.06); color: var(--accent); }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: all var(--transition); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===================================================
   HERO BANNER & SLIDER
   =================================================== */
#hero {
  position: relative; height: 100vh; min-height: 600px;
  overflow: hidden; margin-top: 70px;
}
.hero-slider { position: relative; width: 100%; height: 100%; }
.hero-slide {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0; transition: opacity 1s ease;
}
.hero-slide.active { opacity: 1; }
.hero-slide::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10,14,26,0.85) 0%, rgba(10,14,26,0.4) 60%, transparent 100%);
}
.hero-content {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  text-align: center; width: 90%; max-width: 800px;
  z-index: 2;
}
.hero-badge {
  display: inline-block;
  background: rgba(255,109,0,0.15); border: 1px solid var(--accent);
  color: var(--accent); padding: 6px 18px; border-radius: 20px;
  font-size: 0.85rem; font-weight: 600; letter-spacing: 0.1em;
  margin-bottom: 20px; text-transform: uppercase;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800; color: #fff; line-height: 1.2;
  margin-bottom: 20px; text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero-title span { color: var(--accent); }
.hero-desc {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: rgba(255,255,255,0.85); margin-bottom: 36px; line-height: 1.8;
}
.hero-advantages {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 12px; margin-bottom: 36px;
}
.hero-advantage-item {
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
  padding: 8px 18px; border-radius: 20px; font-size: 0.9rem; color: #fff;
}
.hero-advantage-item::before { content: '✓'; color: var(--accent); font-weight: 700; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; padding: 14px 36px; border-radius: 30px;
  font-size: 1rem; font-weight: 700; border: none; cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(255,109,0,0.3);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(255,109,0,0.4); color: #fff; }
.btn-outline {
  background: transparent; color: #fff;
  padding: 14px 36px; border-radius: 30px;
  font-size: 1rem; font-weight: 600;
  border: 2px solid rgba(255,255,255,0.4); cursor: pointer;
  transition: all var(--transition);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* 轮播控制 */
.slider-dots {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 10px; z-index: 3;
}
.slider-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: rgba(255,255,255,0.4); cursor: pointer;
  transition: all var(--transition);
}
.slider-dot.active { background: var(--accent); width: 24px; border-radius: 4px; }
.slider-arrows {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 100%; display: flex; justify-content: space-between;
  padding: 0 20px; z-index: 3; pointer-events: none;
}
.slider-arrow {
  width: 48px; height: 48px; border-radius: 50%;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; pointer-events: all;
  transition: background var(--transition);
  color: #fff; font-size: 1.2rem;
}
.slider-arrow:hover { background: var(--accent); }

/* ===================================================
   STATS BAR
   =================================================== */
.stats-bar {
  background: linear-gradient(135deg, var(--primary-dark), #1a237e);
  padding: 30px 0;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 20px; text-align: center;
}
.stat-item {}
.stat-number {
  font-size: 2.2rem; font-weight: 800; color: var(--accent);
  line-height: 1.1; margin-bottom: 6px;
}
.stat-label { font-size: 0.9rem; color: rgba(255,255,255,0.75); }

/* ===================================================
   VIDEO SECTION
   =================================================== */
#videos { background: var(--bg-dark); }
.video-tabs {
  display: flex; gap: 8px; justify-content: center;
  flex-wrap: wrap; margin-bottom: 40px;
}
.video-tab {
  padding: 10px 24px; border-radius: 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-muted); font-size: 0.9rem; cursor: pointer;
  transition: all var(--transition);
}
.video-tab.active, .video-tab:hover {
  background: var(--primary); color: #fff; border-color: var(--primary);
}
.video-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.video-card {
  background: var(--bg-card); border-radius: var(--radius);
  overflow: hidden; border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.video-thumb {
  position: relative; aspect-ratio: 16/9; overflow: hidden;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.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: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-circle {
  width: 60px; height: 60px; border-radius: 50%;
  background: rgba(255,109,0,0.9);
  display: flex; align-items: center; justify-content: center;
  transform: scale(0.8); transition: transform var(--transition);
  box-shadow: 0 0 30px rgba(255,109,0,0.5);
}
.video-card:hover .play-circle { transform: scale(1); }
.play-icon {
  width: 0; height: 0;
  border-style: solid; border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-live-badge {
  position: absolute; top: 10px; left: 10px;
  background: #e53935; color: #fff;
  padding: 3px 10px; border-radius: 4px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.05em;
  display: flex; align-items: center; gap: 5px;
}
.video-live-badge::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: #fff; animation: blink 1s infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75); color: #fff;
  padding: 2px 8px; border-radius: 4px; font-size: 0.78rem;
}
.video-views {
  position: absolute; bottom: 8px; left: 8px;
  background: rgba(0,0,0,0.6); color: rgba(255,255,255,0.85);
  padding: 2px 8px; border-radius: 4px; font-size: 0.75rem;
  display: flex; align-items: center; gap: 4px;
}
.video-info { padding: 16px; }
.video-category {
  font-size: 0.75rem; color: var(--accent); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 6px;
}
.video-title {
  font-size: 0.95rem; font-weight: 600; color: #fff;
  line-height: 1.4; margin-bottom: 10px;
  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: 0.8rem; color: var(--text-muted);
}
.video-interactions { display: flex; gap: 12px; }
.video-interaction { display: flex; align-items: center; gap: 4px; }

/* ===================================================
   ABOUT SECTION
   =================================================== */
#about { background: var(--bg-card2); }
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center;
}
.about-img { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.about-img img { width: 100%; height: 360px; object-fit: cover; }
.about-content {}
.about-tag {
  display: inline-block;
  background: rgba(255,109,0,0.1); color: var(--accent);
  padding: 4px 14px; border-radius: 20px; font-size: 0.82rem;
  font-weight: 600; margin-bottom: 16px; border: 1px solid rgba(255,109,0,0.2);
}
.about-title { font-size: 1.8rem; font-weight: 700; color: #fff; margin-bottom: 16px; line-height: 1.3; }
.about-title span { color: var(--accent); }
.about-desc { color: var(--text-muted); line-height: 1.8; margin-bottom: 24px; }
.about-milestones { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.milestone-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px;
}
.milestone-year { font-size: 0.8rem; color: var(--accent); font-weight: 700; margin-bottom: 4px; }
.milestone-text { font-size: 0.88rem; color: var(--text-muted); line-height: 1.5; }

/* ===================================================
   SERVICES SECTION
   =================================================== */
#services { background: var(--bg-dark); }
.services-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.service-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transition: transform var(--transition);
}
.service-card:hover::before { transform: scaleX(1); }
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(21,101,192,0.3); }
.service-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 20px;
}
.service-title { font-size: 1.15rem; font-weight: 700; color: #fff; margin-bottom: 12px; }
.service-desc { color: var(--text-muted); font-size: 0.92rem; line-height: 1.7; margin-bottom: 16px; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.service-tag {
  background: rgba(21,101,192,0.15); color: var(--primary);
  padding: 4px 12px; border-radius: 12px; font-size: 0.78rem;
  border: 1px solid rgba(21,101,192,0.2);
}

/* ===================================================
   CASES SECTION
   =================================================== */
#cases { background: var(--bg-card2); }
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all var(--transition);
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.case-img { aspect-ratio: 16/9; overflow: hidden; }
.case-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.case-card:hover .case-img img { transform: scale(1.05); }
.case-body { padding: 20px; }
.case-industry {
  font-size: 0.75rem; color: var(--accent); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 8px;
}
.case-title { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 10px; line-height: 1.4; }
.case-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.case-results {
  background: rgba(255,109,0,0.08); border: 1px solid rgba(255,109,0,0.15);
  border-radius: 8px; padding: 10px 14px;
  font-size: 0.82rem; color: var(--accent-light);
}

/* ===================================================
   NEWS SECTION
   =================================================== */
#news { background: var(--bg-dark); }
.news-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.news-featured {
  grid-row: span 2;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all var(--transition);
}
.news-featured:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.news-featured .news-img { aspect-ratio: 4/3; overflow: hidden; }
.news-featured .news-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.news-featured:hover .news-img img { transform: scale(1.04); }
.news-body { padding: 24px; }
.news-tag {
  display: inline-block;
  background: rgba(21,101,192,0.15); color: var(--primary);
  padding: 3px 12px; border-radius: 12px; font-size: 0.78rem;
  font-weight: 600; margin-bottom: 12px; border: 1px solid rgba(21,101,192,0.2);
}
.news-tag.hot { background: rgba(255,109,0,0.1); color: var(--accent); border-color: rgba(255,109,0,0.2); }
.news-title { font-size: 1.1rem; font-weight: 700; color: #fff; margin-bottom: 10px; line-height: 1.4; }
.news-title a:hover { color: var(--accent); }
.news-excerpt { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; }
.news-meta { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-muted); }
.news-small {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  display: flex; gap: 0; transition: all var(--transition);
}
.news-small:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.news-small .news-img { width: 120px; flex-shrink: 0; }
.news-small .news-img img { width: 100%; height: 100%; object-fit: cover; }
.news-small .news-body { padding: 16px; flex: 1; }
.news-small .news-title { font-size: 0.92rem; }

/* ===================================================
   REVIEWS SECTION
   =================================================== */
#reviews { background: var(--bg-card2); }
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: all var(--transition); position: relative;
}
.review-card::before {
  content: '"'; position: absolute; top: 16px; right: 20px;
  font-size: 4rem; color: rgba(255,109,0,0.1); font-family: Georgia, serif; line-height: 1;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.review-stars { color: #ffc107; font-size: 1rem; margin-bottom: 14px; letter-spacing: 2px; }
.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: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 700; color: #fff; flex-shrink: 0;
}
.review-name { font-size: 0.92rem; font-weight: 600; color: #fff; }
.review-role { font-size: 0.78rem; color: var(--text-muted); }

/* ===================================================
   PARTNERS SECTION
   =================================================== */
#partners { background: var(--bg-dark); }
.partners-grid {
  display: grid; grid-template-columns: repeat(6, 1fr);
  gap: 16px; align-items: center;
}
.partner-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 20px 16px;
  display: flex; align-items: center; justify-content: center;
  height: 80px; transition: all var(--transition);
  font-size: 0.85rem; font-weight: 600; color: var(--text-muted);
  text-align: center;
}
.partner-item:hover { border-color: var(--primary); color: #fff; background: rgba(21,101,192,0.1); }

/* ===================================================
   FAQ SECTION
   =================================================== */
#faq { background: var(--bg-card2); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 12px; overflow: hidden;
}
.faq-question {
  padding: 20px 24px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 1rem; font-weight: 600; color: #fff;
  transition: background var(--transition);
}
.faq-question:hover { background: rgba(255,255,255,0.03); }
.faq-icon {
  width: 24px; height: 24px; border-radius: 50%;
  background: rgba(21,101,192,0.2); display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: var(--primary); transition: transform var(--transition); flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: rgba(255,109,0,0.2); color: var(--accent); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
  padding: 0 24px;
}
.faq-item.open .faq-answer { max-height: 200px; padding: 0 24px 20px; }
.faq-answer p { font-size: 0.92rem; color: var(--text-muted); line-height: 1.7; }

/* ===================================================
   CONTACT SECTION
   =================================================== */
#contact { background: var(--bg-dark); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.contact-info {}
.contact-title { font-size: 1.6rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.contact-desc { color: var(--text-muted); line-height: 1.8; margin-bottom: 30px; }
.contact-items { display: flex; flex-direction: column; gap: 16px; }
.contact-item { display: flex; align-items: flex-start; gap: 14px; }
.contact-icon {
  width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  background: rgba(21,101,192,0.15); border: 1px solid rgba(21,101,192,0.2);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
}
.contact-item-content {}
.contact-item-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-item-value { font-size: 0.95rem; color: #fff; font-weight: 500; }
.contact-map {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); height: 280px;
  display: flex; align-items: center; justify-content: center;
  margin-top: 24px; color: var(--text-muted); font-size: 0.9rem;
  flex-direction: column; gap: 10px;
}
.contact-map-icon { font-size: 2rem; }

/* ===================================================
   FOOTER
   =================================================== */
#footer {
  background: #060a14;
  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: 40px;
}
.footer-brand {}
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-logo img { height: 40px; }
.footer-brand-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.footer-qrcodes { display: flex; gap: 16px; }
.footer-qrcode { text-align: center; }
.footer-qrcode img { width: 80px; height: 80px; border-radius: 8px; margin-bottom: 6px; }
.footer-qrcode p { font-size: 0.72rem; color: var(--text-muted); }
.footer-col-title { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 20px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.88rem; color: var(--text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.footer-copyright { font-size: 0.82rem; color: var(--text-muted); }
.footer-copyright a { color: var(--primary); }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px; height: 36px; border-radius: 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; color: var(--text-muted);
  transition: all var(--transition); cursor: pointer;
}
.social-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.footer-update { font-size: 0.8rem; color: var(--text-muted); }
.footer-update span { color: var(--accent-light); }

/* ===================================================
   BREADCRUMB
   =================================================== */
.breadcrumb {
  background: var(--bg-card2); padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.85rem; color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--text-muted); }
.breadcrumb-inner a:hover { color: var(--accent); }
.breadcrumb-inner .sep { color: var(--border); }
.breadcrumb-inner .current { color: var(--accent); }

/* ===================================================
   PAGE HERO (内页顶部)
   =================================================== */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #1a237e 50%, #0a0e1a 100%);
  padding: 80px 0 60px; text-align: center; margin-top: 70px;
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background: url('../images/hero_banner.jpg') center/cover no-repeat;
  opacity: 0.08;
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero h1 { font-size: 2.2rem; font-weight: 800; color: #fff; margin-bottom: 12px; }
.page-hero h1 span { color: var(--accent); }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.75); max-width: 600px; margin: 0 auto; }

/* ===================================================
   RESPONSIVE
   =================================================== */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(4, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-title { font-size: 1.6rem; }
  .main-nav, .search-bar { display: none; }
  .hamburger { display: flex; }
  .mobile-menu {
    position: fixed; top: 70px; left: 0; right: 0; bottom: 0;
    background: rgba(10,14,26,0.98); z-index: 999;
    display: flex; flex-direction: column; align-items: center;
    justify-content: flex-start; padding: 30px 20px; gap: 8px;
    transform: translateX(-100%); transition: transform var(--transition);
  }
  .mobile-menu.open { transform: translateX(0); }
  .mobile-menu a {
    font-size: 1.1rem; padding: 14px 24px; width: 100%; text-align: center;
    border-radius: 10px; border: 1px solid var(--border);
  }
  .mobile-search { width: 100%; margin-bottom: 10px; }
  .mobile-search input {
    width: 100%; padding: 12px 16px; border-radius: 10px;
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-main); font-size: 0.95rem; outline: none;
  }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .news-featured { grid-row: auto; }
  .news-small { flex-direction: column; }
  .news-small .news-img { width: 100%; height: 160px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .about-milestones { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-btns { flex-direction: column; align-items: center; }
  .btn-primary, .btn-outline { width: 100%; max-width: 280px; text-align: center; }
}

/* ===================================================
   UTILITY CLASSES
   =================================================== */
.text-center { text-align: center; }
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.view-more-btn {
  display: block; width: fit-content; margin: 40px auto 0;
  padding: 12px 36px; border-radius: 24px;
  border: 2px solid var(--primary); color: var(--primary);
  font-size: 0.95rem; font-weight: 600;
  transition: all var(--transition); cursor: pointer;
}
.view-more-btn:hover { background: var(--primary); color: #fff; }

/* 懒加载占位 */
img[data-src] { background: var(--bg-card); min-height: 100px; }

/* 滚动动画 */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }