/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #F15A24;
      --primary-soft: rgba(241, 90, 36, 0.08);
      --primary-glow: rgba(241, 90, 36, 0.2);
      --secondary: #2C2E33;
      --gray-900: #2C2E33;
      --gray-700: #5F6B7A;
      --gray-500: #98A2B3;
      --gray-200: #EAECF0;
      --gray-100: #F7F8FA;
      --gray-50: #F9FAFB;
      --white: #FFFFFF;
      --border-light: 1px solid #EAECF0;
      --border-input: 1px solid #D0D5DD;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-full: 30px;
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.06);
      --shadow-btn: 0 2px 8px rgba(241, 90, 36, 0.25);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: 'Inter', -apple-system, sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
      --section-padding: 100px;
      --section-padding-mobile: 60px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--gray-700);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 排版 */
    h1, h2, h3, .h1, .h2, .h3 {
      color: var(--secondary);
      font-weight: 700;
    }

    h1 {
      font-size: 56px;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      letter-spacing: -0.3px;
    }

    h3 {
      font-size: 20px;
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 28px;
      }
    }

    .text-mono {
      font-family: var(--font-mono);
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      display: flex;
      align-items: center;
      z-index: 100;
      transition: background 0.3s, box-shadow 0.3s;
    }

    .nav.scrolled {
      background: var(--white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
    }

    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--gray-700);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: transform 0.2s, box-shadow 0.2s;
      box-shadow: var(--shadow-btn);
    }

    .btn-nav:hover {
      transform: scale(1.03);
      box-shadow: 0 4px 14px rgba(241,90,36,0.35);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--secondary);
      transition: 0.2s;
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: white;
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        font-size: 20px;
        z-index: 99;
      }
      .nav-links.active {
        transform: translateX(0);
      }
      .hamburger {
        display: flex;
        z-index: 101;
      }
    }

    /* 板块通用 */
    section {
      padding: var(--section-padding) 0;
    }

    @media (max-width: 768px) {
      section {
        padding: var(--section-padding-mobile) 0;
      }
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-text {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .hero-sub {
      font-size: 22px;
      color: var(--gray-700);
      max-width: 600px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
      box-shadow: var(--shadow-btn);
      border: none;
      cursor: pointer;
      display: inline-block;
    }

    .btn-primary:hover {
      transform: scale(1.03);
      background: #e04a1a;
    }

    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .hero-image {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #f0f2f5;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
    }

    .data-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(241,90,36,0.05) 0%, transparent 60%);
      pointer-events: none;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-sub {
        font-size: 18px;
      }
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--gray-100);
      border: var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: 0.2s;
    }

    .stat-card:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-mono);
      margin-bottom: 8px;
    }

    .stat-label {
      color: var(--gray-700);
      font-weight: 500;
    }

    .trend-line {
      margin-top: 16px;
    }

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

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: white;
      border: var(--border-light);
      border-radius: 16px;
      padding: 32px;
      transition: 0.2s;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
    }

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

    .service-link {
      color: var(--primary);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }

    .service-link:hover {
      gap: 8px;
    }

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

    /* 对比模块 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
      align-items: center;
    }

    .vs-badge {
      font-weight: 700;
      color: var(--gray-500);
      font-size: 18px;
    }

    .compare-col {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
    }

    .compare-col.left {
      background: #f5f5f5;
    }

    .compare-col.right {
      background: rgba(241,90,36,0.04);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .compare-col.left .compare-item i {
      color: #ccc;
    }

    .compare-col.right .compare-item i {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .comparison-wrapper {
        grid-template-columns: 1fr;
      }
      .vs-badge {
        text-align: center;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 720px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid #eee;
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 0;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--secondary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--gray-700);
    }

    .faq-answer p {
      padding-bottom: 20px;
    }

    .faq-icon {
      transition: transform 0.2s;
    }

    /* 表单 */
    .contact-band {
      background: var(--gray-50);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .form-input {
      width: 100%;
      padding: 14px 16px;
      border: var(--border-input);
      border-radius: 8px;
      font-size: 15px;
      margin-bottom: 16px;
      transition: 0.2s;
    }

    .form-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--primary-glow);
      outline: none;
    }

    .btn-capsule {
      background: var(--primary);
      color: white;
      padding: 16px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: 0.2s;
    }

    .btn-capsule:hover {
      transform: scale(1.02);
      background: #d94a1a;
    }

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

    footer {
      background: white;
      border-top: 1px solid #f0f0f0;
      padding: 32px 0;
      text-align: center;
      color: var(--gray-500);
      font-size: 13px;
    }