/* roulang page: index */
:root {
      --primary: #E6332C;
      --primary-dark: #C41E18;
      --secondary: #1A1F36;
      --bg-light: #F7F8FA;
      --bg-dark: #0B0F19;
      --accent-green: #00C49A;
      --text-primary: #1A1F36;
      --text-secondary: #5A6070;
      --text-on-dark: #FFFFFF;
      --border-light: #E9EBF0;
      --border-input: #D1D5DB;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-full: 24px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-primary);
      background: #FFFFFF;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: #FFFFFF;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      font-style: italic;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><polyline points="4 17 10 11 4 5"/><line x1="12" y1="19" x2="20" y2="19"/></svg>') center/contain no-repeat;
      background: var(--primary);
      border-radius: 4px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .search-box {
      display: flex;
      align-items: center;
      background: #F2F4F8;
      border-radius: var(--radius-full);
      padding: 6px 16px;
      margin-right: 16px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.9rem;
      width: 120px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.3s ease;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 4px 12px rgba(230,51,44,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.3s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(230,51,44,0.08);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--secondary);
    }
    /* 首屏 */
    #hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      color: white;
      padding: 120px 0;
      display: flex;
      align-items: center;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.5);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .hero-text {
      max-width: 600px;
    }
    .hero-text h1 {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      line-height: 1.6;
      margin-bottom: 32px;
      opacity: 0.9;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .float-cards {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .float-card {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.2);
      padding: 16px 24px;
      border-radius: var(--radius-md);
      color: white;
      animation: float 3s infinite ease-in-out;
      width: 200px;
    }
    .float-card:nth-child(2) { animation-delay: 0.4s; }
    .float-card:nth-child(3) { animation-delay: 0.8s; }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0); }
    }
    .float-metric {
      font-family: var(--font-number);
      font-size: 28px;
      font-weight: 700;
    }
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--secondary);
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--primary);
      margin-top: 8px;
    }
    /* 数据看板 */
    #metrics {
      background: var(--bg-dark);
      color: white;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .metric-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      padding: 28px;
      transition: all 0.3s ease;
    }
    .metric-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }
    .metric-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }
    .trend-line {
      margin: 12px 0 8px;
      width: 60px;
      height: 4px;
      background: var(--accent-green);
    }
    /* 服务矩阵 */
    #services {
      background: var(--bg-light);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
      transform: translateY(-4px);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><circle cx="12" cy="12" r="10"/></svg>') center/contain no-repeat;
      margin-bottom: 20px;
      transition: transform 0.3s;
    }
    .service-card:hover .service-icon {
      transform: rotate(5deg);
    }
    .service-link {
      margin-top: 16px;
      color: var(--primary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    /* 对比 */
    #comparison {
      background: white;
    }
    .compare-grid {
      display: flex;
      gap: 40px;
      margin-top: 40px;
    }
    .compare-col {
      flex: 1;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .divider {
      width: 1px;
      background: var(--border-light);
    }
    /* FAQ */
    .faq-item {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      padding: 18px 24px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, var(--primary) 0%, #B3120A 100%);
      color: white;
    }
    .cta-grid {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      margin-bottom: 16px;
      font-family: inherit;
    }
    .footer {
      background: var(--bg-dark);
      color: #CCCCCC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .compare-grid { flex-direction: column; }
      .divider { display: none; }
    }
    @media (max-width: 768px) {
      .nav-links, .search-box { display: none; }
      .hamburger { display: flex; }
      .hero-text h1 { font-size: 32px; }
      .section { padding: 60px 0; }
      .services-grid, .metrics-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .cta-grid { flex-direction: column; }
      .float-cards { display: none; }
    }