/* =============================================
   红桃视频官网 - 主样式文件
   深空黑 + 霓虹蓝紫渐变科技风格
   ============================================= */

/* CSS变量 */
:root {
  --color-bg: #050a14;
  --color-bg2: #080f1e;
  --color-bg3: #0d1526;
  --color-primary: #4f8ef7;
  --color-secondary: #a855f7;
  --color-accent: #06b6d4;
  --color-red: #e84c7d;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-border: rgba(79,142,247,0.2);
  --gradient-main: linear-gradient(135deg, #4f8ef7 0%, #a855f7 100%);
  --gradient-hero: linear-gradient(135deg, #050a14 0%, #0d1526 50%, #1a0a2e 100%);
  --shadow-glow: 0 0 30px rgba(79,142,247,0.3);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
}

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

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

/* ============ 通用工具类 ============ */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
}
.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 20px rgba(79,142,247,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79,142,247,0.6);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}
.badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(79,142,247,0.15);
  color: var(--color-primary);
  border: 1px solid rgba(79,142,247,0.3);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}
.section-subtitle {
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 50px;
}
.divider {
  width: 60px;
  height: 3px;
  background: var(--gradient-main);
  border-radius: 2px;
  margin: 16px auto 20px;
}

/* ============ 导航栏 ============ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(5,10,20,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(5,10,20,0.98);
  box-shadow: var(--shadow-glow);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}
.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-main);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.nav-logo span.brand { color: var(--color-red); }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-menu a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  transition: var(--transition);
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--color-primary);
  background: rgba(79,142,247,0.1);
}
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ============ 搜索框 ============ */
.search-bar-wrap {
  background: rgba(8,15,30,0.95);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 700px;
  margin: 0 auto;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  padding: 0 20px;
  gap: 10px;
}
.search-bar-inner input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 14px;
  padding: 10px 0;
  font-family: var(--font-main);
}
.search-bar-inner input::placeholder { color: var(--color-text-muted); }
.search-bar-inner button {
  background: var(--gradient-main);
  border: none;
  color: #fff;
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.search-bar-inner button:hover { opacity: 0.85; }
.search-icon { color: var(--color-text-muted); font-size: 16px; }

/* ============ Hero Banner ============ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 120px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner_hero.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.25;
  z-index: 1;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(5,10,20,0.9) 40%, rgba(5,10,20,0.3) 100%);
  z-index: 2;
}
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 4;
  max-width: 700px;
}
.hero-badge { margin-bottom: 20px; }
.hero h1 {
  font-size: clamp(32px, 5vw, 60px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-desc {
  font-size: 17px;
  color: var(--color-text-muted);
  margin-bottom: 36px;
  max-width: 560px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 60px;
  flex-wrap: wrap;
}
.hero-stat-item { text-align: left; }
.hero-stat-num {
  font-size: 36px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.hero-stat-label { font-size: 13px; color: var(--color-text-muted); margin-top: 4px; }
.hero-visual {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 45%;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-play-btn {
  width: 100px;
  height: 100px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: #fff;
  box-shadow: 0 0 60px rgba(79,142,247,0.5);
  cursor: pointer;
  animation: pulse 2s infinite;
  transition: var(--transition);
}
.hero-play-btn:hover { transform: scale(1.1); }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 40px rgba(79,142,247,0.4); }
  50% { box-shadow: 0 0 80px rgba(168,85,247,0.6); }
}

/* ============ 视频卡片 ============ */
.video-card {
  background: var(--color-bg3);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}
.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-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-overlay { opacity: 1; }
.video-play-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: #fff;
  box-shadow: 0 0 30px rgba(79,142,247,0.6);
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .video-play-icon { transform: scale(1); }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--color-text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tag {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(79,142,247,0.15);
  color: var(--color-primary);
  border-radius: 4px;
  font-size: 11px;
  margin-bottom: 8px;
}

/* ============ 产品卡片 ============ */
.product-card {
  background: var(--color-bg3);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transition: var(--transition);
}
.product-card:hover::before { transform: scaleX(1); }
.product-card:hover {
  border-color: rgba(79,142,247,0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.product-icon {
  width: 60px;
  height: 60px;
  background: rgba(79,142,247,0.1);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
  border: 1px solid rgba(79,142,247,0.2);
}
.product-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.product-card p { font-size: 14px; color: var(--color-text-muted); line-height: 1.7; }
.product-card .card-img {
  width: 100%;
  border-radius: 8px;
  margin-top: 20px;
  aspect-ratio: 4/3;
  object-fit: cover;
  opacity: 0.8;
  transition: var(--transition);
}
.product-card:hover .card-img { opacity: 1; }

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

/* ============ 技术引擎 ============ */
.tech-section { background: var(--color-bg2); }
.tech-list { display: flex; flex-direction: column; gap: 16px; }
.tech-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--color-bg3);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}
.tech-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}
.tech-num {
  font-size: 32px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  min-width: 48px;
}
.tech-item h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.tech-item p { font-size: 13px; color: var(--color-text-muted); }

/* ============ 解决方案 ============ */
.solution-card {
  background: var(--color-bg3);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: var(--transition);
}
.solution-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.solution-img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.solution-card:hover .solution-img { transform: scale(1.03); }
.solution-body { padding: 24px; }
.solution-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.solution-body p { font-size: 14px; color: var(--color-text-muted); margin-bottom: 16px; }
.solution-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.solution-tag {
  padding: 4px 12px;
  background: rgba(168,85,247,0.1);
  color: var(--color-secondary);
  border-radius: 50px;
  font-size: 12px;
  border: 1px solid rgba(168,85,247,0.2);
}

/* ============ 流程步骤 ============ */
.process-section { background: var(--color-bg2); }
.process-steps { display: flex; gap: 0; position: relative; }
.process-steps::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: var(--gradient-main);
  opacity: 0.3;
}
.process-step {
  flex: 1;
  text-align: center;
  padding: 0 16px;
  position: relative;
}
.step-num {
  width: 80px;
  height: 80px;
  background: var(--color-bg3);
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  color: var(--color-primary);
  margin: 0 auto 20px;
  position: relative;
  z-index: 1;
  transition: var(--transition);
}
.process-step:hover .step-num {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}
.process-step h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.process-step p { font-size: 13px; color: var(--color-text-muted); }

/* ============ 案例 ============ */
.case-card {
  background: var(--color-bg3);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: var(--transition);
}
.case-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}
.case-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.case-body { padding: 24px; }
.case-body h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.case-body p { font-size: 13px; color: var(--color-text-muted); margin-bottom: 16px; }
.case-result {
  display: flex;
  gap: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}
.case-result-item { text-align: center; }
.case-result-num {
  font-size: 22px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.case-result-label { font-size: 11px; color: var(--color-text-muted); }

/* ============ 新闻动态 ============ */
.news-card {
  background: var(--color-bg3);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.news-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
}
.news-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.news-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.news-date { font-size: 12px; color: var(--color-text-muted); margin-bottom: 8px; }
.news-body h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; line-height: 1.5; }
.news-body p { font-size: 13px; color: var(--color-text-muted); flex: 1; }
.news-more { margin-top: 12px; font-size: 13px; color: var(--color-primary); }

/* ============ 用户评价 ============ */
.reviews-section { background: var(--color-bg2); }
.review-card {
  background: var(--color-bg3);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  position: relative;
}
.review-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 80px;
  color: rgba(79,142,247,0.1);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-card:hover { border-color: var(--color-primary); }
.review-stars { color: #f59e0b; font-size: 14px; margin-bottom: 12px; }
.review-text { font-size: 14px; color: var(--color-text-muted); line-height: 1.8; margin-bottom: 20px; }
.review-user { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 700; }
.review-role { font-size: 12px; color: var(--color-text-muted); }

/* ============ FAQ ============ */
.faq-section { background: var(--color-bg); }
.faq-item {
  background: var(--color-bg3);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--color-primary); }
.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  gap: 16px;
}
.faq-question:hover { color: var(--color-primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  background: rgba(79,142,247,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-icon { background: var(--color-primary); color: #fff; transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { display: block; }

/* ============ 联系我们 ============ */
.contact-section { background: var(--color-bg2); }
.contact-card {
  background: var(--color-bg3);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  text-align: center;
  transition: var(--transition);
}
.contact-card:hover { border-color: var(--color-primary); transform: translateY(-4px); }
.contact-icon {
  width: 64px;
  height: 64px;
  background: rgba(79,142,247,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin: 0 auto 16px;
  border: 1px solid rgba(79,142,247,0.2);
}
.contact-card h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--color-text-muted); }

/* ============ 页脚 ============ */
.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}
.footer-brand p { font-size: 14px; color: var(--color-text-muted); margin-top: 12px; line-height: 1.8; }
.footer-col h5 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-col ul li { margin-bottom: 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); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 13px; color: var(--color-text-muted); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 13px; color: var(--color-text-muted); }
.footer-links a:hover { color: var(--color-primary); }

/* ============ 统计数字 ============ */
.stats-section { background: var(--color-bg2); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--color-bg3);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--color-primary); transform: translateY(-4px); }
.stat-num {
  font-size: 42px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { font-size: 14px; color: var(--color-text-muted); }

/* ============ 面包屑 ============ */
.breadcrumb {
  padding: 16px 0;
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { color: var(--color-primary); }

/* ============ 内页Banner ============ */
.inner-banner {
  background: var(--gradient-hero);
  padding: 100px 0 60px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}
.inner-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79,142,247,0.1) 0%, transparent 70%);
}
.inner-banner h1 { font-size: clamp(28px, 4vw, 48px); font-weight: 800; margin-bottom: 12px; }
.inner-banner p { font-size: 16px; color: var(--color-text-muted); max-width: 600px; }

/* ============ 标签页 ============ */
.tabs { display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; }
.tab-btn {
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 14px;
  cursor: pointer;
  border: 1.5px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  transition: var(--transition);
  font-family: var(--font-main);
}
.tab-btn.active, .tab-btn:hover {
  background: var(--gradient-main);
  border-color: transparent;
  color: #fff;
}

/* ============ 加载动画 ============ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.animate-fade-up { animation: fadeInUp 0.6s ease forwards; }
.animate-fade { animation: fadeIn 0.6s ease forwards; }
.animate-float { animation: float 3s ease-in-out infinite; }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-visual { display: none; }
  .process-steps { flex-wrap: wrap; }
  .process-steps::before { display: none; }
  .process-step { flex: 0 0 50%; }
}
@media (max-width: 768px) {
  .section { padding: 50px 0; }
  .grid-2, .grid-3, .grid-video { grid-template-columns: 1fr; }
  .nav-menu, .nav-actions .btn { display: none; }
  .nav-toggle { display: flex; }
  .hero { padding-top: 140px; min-height: auto; padding-bottom: 60px; }
  .hero h1 { font-size: 28px; }
  .hero-stats { gap: 24px; }
  .hero-stat-num { font-size: 28px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .process-step { flex: 0 0 100%; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .stats-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}

/* ============ 移动端菜单 ============ */
.mobile-menu {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: rgba(5,10,20,0.98);
  border-bottom: 1px solid var(--color-border);
  padding: 20px;
  z-index: 999;
  flex-direction: column;
  gap: 8px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--color-text-muted);
  border: 1px solid transparent;
}
.mobile-menu a:hover { color: var(--color-primary); border-color: var(--color-border); }

/* ============ 粒子效果 ============ */
.particle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  animation: particleFloat linear infinite;
}
@keyframes particleFloat {
  0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100px) rotate(720deg); opacity: 0; }
}

/* ============ 视频播放模态框 ============ */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: var(--color-bg3);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 800px;
  width: 90%;
  position: relative;
  border: 1px solid var(--color-border);
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: var(--transition);
}
.video-modal-close:hover { color: var(--color-text); }
.video-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 60px;
  color: var(--color-primary);
  border: 1px dashed var(--color-border);
}

/* ============ 合作伙伴 ============ */
.partner-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 30px 0;
}
.partner-logo {
  background: var(--color-bg3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-muted);
  transition: var(--transition);
}
.partner-logo:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ============ 特性列表 ============ */
.feature-list { display: flex; flex-direction: column; gap: 12px; }
.feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--color-text-muted);
}
.feature-check {
  width: 20px;
  height: 20px;
  background: rgba(79,142,247,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* ============ 内页随机栏目 ============ */
.sidebar-widget {
  background: var(--color-bg3);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}
.sidebar-widget h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}
.sidebar-list li { margin-bottom: 10px; }
.sidebar-list li a { font-size: 13px; color: var(--color-text-muted); display: flex; align-items: center; gap: 8px; }
.sidebar-list li a:hover { color: var(--color-primary); }
.sidebar-list li a::before { content: '▶'; font-size: 8px; color: var(--color-primary); }