/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary: #FF4D2E;
      --primary-hover: #E94560;
      --secondary: #1A1A2E;
      --bg-dark: #0F0F1A;
      --bg-darker: #0A0A14;
      --bg-light: #FFFFFF;
      --text-light: #F0F0F0;
      --text-dark: #1A1A2E;
      --text-muted: #B0B0C0;
      --border-light: rgba(255, 255, 255, 0.2);
      --border-card: rgba(255, 77, 46, 0.1);
      --shadow-sm: 0 4px 20px rgba(255, 77, 46, 0.08);
      --shadow-hover: 0 8px 30px rgba(255, 77, 46, 0.2);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-pill: 20px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --font-mono: 'DIN Alternate', 'PingFang SC', 'Inter', sans-serif;
      --transition: 0.3s ease;
      --max-width: 1200px;
      --gap: 24px;
      --section-padding: 100px 0;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-body);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.8;
      background-color: var(--bg-dark);
      color: var(--text-light);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeSpeed;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    p {
      color: var(--text-muted);
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      border: none;
      font-family: var(--font-body);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      border-radius: var(--radius-sm);
      padding: 14px 32px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(15, 15, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 77, 46, 0.15);
      padding: 0 24px;
      height: 80px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      max-width: var(--max-width);
      width: 100%;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 26px;
      color: var(--primary);
      letter-spacing: 1px;
    }

    .logo i {
      font-size: 32px;
      filter: drop-shadow(0 0 8px rgba(255,77,46,0.6));
    }

    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
      flex-wrap: wrap;
      justify-content: center;
    }

    .nav-chip {
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-muted);
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      font-size: 15px;
      font-weight: 500;
      transition: var(--transition);
      white-space: nowrap;
    }

    .nav-chip:hover, .nav-chip.active {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 0 15px rgba(255,77,46,0.5);
    }

    .btn-primary {
      background: linear-gradient(135deg, #FF4D2E, #E94560);
      color: white;
      box-shadow: 0 4px 15px rgba(255, 77, 46, 0.3);
      border-radius: var(--radius-sm);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 25px rgba(255, 77, 46, 0.6);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-sm);
    }

    .btn-outline:hover {
      background: rgba(255, 77, 46, 0.05);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }

    .hamburger {
      display: none;
      background: transparent;
      color: white;
      font-size: 28px;
      padding: 8px;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: rgba(15, 15, 26, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 12px;
        border-bottom: 1px solid var(--primary);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-container .btn-primary {
        display: none;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 120px 0 80px;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: radial-gradient(circle at 30% 40%, rgba(255,77,46,0.15), transparent 70%);
      pointer-events: none;
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-title {
      font-size: 52px;
      margin-bottom: 20px;
      color: white;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 30px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .data-dashboard {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .metric-card {
      background: rgba(15, 15, 26, 0.8);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 77, 46, 0.3);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      align-items: center;
      gap: 15px;
      box-shadow: 0 0 20px rgba(255,77,46,0.1);
    }

    .metric-icon {
      font-size: 36px;
      color: var(--primary);
    }

    .metric-value {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: white;
      line-height: 1.2;
    }

    .metric-label {
      color: var(--text-muted);
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .hero .container {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 36px;
      }
    }

    /* 通用section */
    section {
      padding: var(--section-padding);
    }

    .section-title {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-title h2 {
      color: white;
    }

    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* 核心优势非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 30px;
      align-items: start;
    }

    .adv-main {
      background: var(--bg-light);
      border-radius: var(--radius-md);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-card);
      color: var(--text-dark);
    }

    .adv-main i {
      font-size: 48px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .adv-secondary {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .adv-item {
      background: var(--bg-light);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-card);
      color: var(--text-dark);
    }

    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .service-card {
      background: var(--bg-light);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--border-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      color: var(--text-dark);
      position: relative;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .service-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .service-metric {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 28px;
      color: var(--primary);
      margin-top: 15px;
    }

    @media (max-width: 992px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据对比表格 */
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .comparison-table th {
      background: var(--secondary);
      color: white;
      padding: 18px;
      font-weight: 600;
    }

    .comparison-table td {
      padding: 16px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      color: var(--text-light);
    }

    .comparison-table tr:nth-child(even) td {
      background: rgba(255,255,255,0.02);
    }

    .highlight-cell {
      color: var(--primary);
      font-weight: 700;
    }

    .table-wrap {
      overflow-x: auto;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border-left: 3px solid transparent;
      transition: var(--transition);
    }

    .faq-item.active {
      border-left-color: var(--primary);
      background: rgba(255,77,46,0.05);
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      color: var(--text-muted);
      transition: max-height 0.4s ease, padding 0.3s;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 20px 20px;
    }

    /* CTA表单 */
    .cta-section {
      background: var(--bg-darker);
    }

    .form-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      align-items: center;
      margin-top: 30px;
    }

    .form-input {
      background: rgba(255,255,255,0.08);
      border: 1px solid var(--border-light);
      border-radius: 6px;
      padding: 14px 18px;
      color: white;
      font-size: 16px;
      min-width: 200px;
      flex: 1;
    }

    .form-input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 10px rgba(255,77,46,0.3);
    }

    select.form-input {
      appearance: none;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="white"><path d="M7 10l5 5 5-5z"/></svg>');
      background-repeat: no-repeat;
      background-position: right 12px center;
    }

    .footer {
      background: var(--bg-darker);
      text-align: center;
      padding: 40px 0;
      color: var(--text-muted);
      border-top: 1px solid rgba(255,77,46,0.1);
    }

    .footer-logo {
      font-size: 24px;
      color: var(--primary);
      margin-bottom: 8px;
    }