/* roulang page: index */
:root {
      --primary-teal: #0A6E5C;
      --accent-orange: #F85C3C;
      --dark-bg: #0B2B26;
      --light-bg: #F4F9F8;
      --white: #FFFFFF;
      --text-main: #1E2D2A;
      --text-muted: #5A6E69;
      --text-light: #A3B8B4;
      --border-light: #D0D9D6;
      --radius-card: 20px;
      --radius-btn: 40px;
      --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.08);
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.2;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: var(--transition);
      background: transparent;
    }
    .navbar.scrolled {
      background: var(--white);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.92);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-teal);
      letter-spacing: -0.3px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary-teal);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-cta {
      background: var(--accent-orange);
      color: var(--white) !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      letter-spacing: 0.5px;
      font-size: 16px;
    }
    .btn-cta:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary-teal);
      cursor: pointer;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 100%;
      height: 100vh;
      background: var(--dark-bg);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      transition: right 0.3s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 8px;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: var(--accent-orange);
      border: none;
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      font-size: 20px;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-container {
        height: 60px;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A6E5C 0%, #0B2B26 100%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 60px;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(248,92,60,0.15) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1;
      color: white;
    }
    .hero-left h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero-left p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 540px;
      color: rgba(255,255,255,0.85);
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    .hero-right {
      flex: 0.8;
      position: relative;
    }
    .hero-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.15);
      position: relative;
    }
    .hero-card img {
      width: 100%;
      height: 320px;
      object-fit: cover;
      display: block;
    }
    .badge-group {
      display: flex;
      gap: 16px;
      padding: 24px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .badge {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(10px);
      padding: 12px 20px;
      border-radius: 16px;
      text-align: center;
      color: var(--dark-bg);
      font-weight: 600;
    }
    .badge span {
      display: block;
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-orange);
      font-family: 'Inter', sans-serif;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 34px;
      }
      .hero-right {
        width: 100%;
      }
      .badge-group {
        justify-content: center;
      }
    }
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 数据看板 */
    .dark-section {
      background: var(--dark-bg);
      position: relative;
      overflow: hidden;
    }
    .dark-section::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(248,92,60,0.15) 0%, transparent 70%);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(255,255,255,0.05);
      border-radius: 20px;
      padding: 32px;
      text-align: center;
      color: white;
    }
    .stat-label {
      color: var(--accent-orange);
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      font-family: 'Inter', sans-serif;
      margin: 8px 0;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务矩阵错层 */
    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-card img {
      height: 200px;
      object-fit: cover;
    }
    .service-card-content {
      padding: 24px;
    }
    .service-card h3 {
      color: var(--primary-teal);
      font-size: 20px;
      margin-bottom: 8px;
    }
    .service-link {
      color: var(--accent-orange);
      font-weight: 600;
      margin-top: 12px;
      display: inline-block;
    }
    .wide-card {
      grid-column: span 2;
    }
    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
      .wide-card {
        grid-column: span 1;
      }
    }
    /* 对比区 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 24px;
      position: relative;
    }
    .compare-card {
      background: white;
      border-radius: 16px;
      padding: 32px;
      flex: 1;
      box-shadow: var(--shadow-card);
    }
    .compare-card.left {
      border-left: 3px solid #ccc;
    }
    .compare-card.right {
      border-left: 3px solid var(--primary-teal);
    }
    .vs-badge {
      background: var(--accent-orange);
      color: white;
      width: 60px;
      height: 60px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 22px;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      z-index: 2;
    }
    .compare-list li {
      list-style: none;
      margin: 16px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    @media (max-width: 768px) {
      .compare-wrapper {
        flex-direction: column;
      }
      .vs-badge {
        position: static;
        transform: none;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #E8EDEB;
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* 表单 */
    .form-card {
      background: white;
      border-radius: 24px;
      padding: 40px;
      max-width: 700px;
      margin: 0 auto;
      box-shadow: var(--shadow-card);
    }
    .form-input {
      width: 100%;
      padding: 14px 16px;
      background: #F4F9F8;
      border: 1px solid #D0D9D6;
      border-radius: 12px;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--primary-teal);
      box-shadow: 0 0 0 3px rgba(10,110,92,0.1);
    }
    .footer {
      background: var(--dark-bg);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }