/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-gradient: #141B33;
      --accent-red: #FF4C2E;
      --accent-red-hover: #D93A1E;
      --accent-mint: #00E5A0;
      --bg-light: #F5F7FC;
      --text-primary: #0A0E27;
      --text-secondary: #4B516A;
      --text-on-dark: rgba(255,255,255,0.9);
      --text-muted-on-dark: rgba(255,255,255,0.7);
      --border-light: rgba(10,14,39,0.08);
      --border-dark: rgba(255,255,255,0.1);
      --card-shadow: 0 2px 8px rgba(10,14,39,0.04);
      --card-shadow-hover: 0 18px 32px rgba(10,14,39,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --transition: 0.25s ease;
      --font-title: 'PingFang SC', 'HarmonyOS Sans', 'Noto Sans SC', 'Inter', sans-serif;
      --font-body: 'Inter', 'PingFang SC', sans-serif;
      --font-number: 'DIN Alternate', 'Inter', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: #ffffff;
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: var(--transition);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.02em;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--accent-red);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-primary);
      font-size: 0.95rem;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -5px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-red);
      transition: var(--transition);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.96);
      backdrop-filter: blur(20px);
      padding: 2rem;
      flex-direction: column;
      gap: 1.5rem;
      z-index: 49;
    }

    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 600;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 1024px) {
      section {
        padding: 70px 0;
      }
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0A0E27 0%, #141B33 100%);
      color: white;
      position: relative;
      overflow: hidden;
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 100px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-text h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 3.5rem;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero-text p {
      font-size: 1.2rem;
      color: var(--text-muted-on-dark);
      margin-bottom: 2rem;
      max-width: 500px;
    }

    .btn-primary {
      background: var(--accent-red);
      color: white;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      border: none;
    }

    .btn-primary:hover {
      background: var(--accent-red-hover);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(255,76,46,0.3);
    }

    .hero-image {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }

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

    .data-card {
      background: white;
      padding: 2rem 1.5rem;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      text-align: center;
    }

    .data-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .trend {
      color: var(--accent-mint);
      font-size: 1.2rem;
    }

    .data-label {
      color: var(--text-secondary);
      margin-top: 0.5rem;
      font-weight: 500;
    }

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

    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      border-left: 5px solid var(--accent-red);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

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

    .service-icon {
      font-size: 2rem;
      color: var(--accent-red);
      margin-bottom: 1rem;
    }

    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 0;
      align-items: center;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .compare-col {
      padding: 2.5rem;
    }

    .compare-left {
      background: #f0f2f5;
    }

    .compare-right {
      background: white;
      border: 2px solid var(--accent-red);
      border-radius: 0 12px 12px 0;
    }

    .vs-badge {
      background: var(--accent-mint);
      color: var(--primary-deep);
      font-weight: 800;
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 -25px;
      z-index: 2;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }

    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

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

    /* CTA */
    #cta {
      background: var(--primary-deep);
      color: white;
    }

    .cta-form {
      display: flex;
      gap: 12px;
      max-width: 500px;
      margin-top: 2rem;
    }

    .cta-form input {
      flex:1;
      padding: 14px;
      border-radius: var(--radius-btn);
      border: none;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .data-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 10px auto; }
    }

    @media (max-width: 640px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .data-grid, .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-form { flex-direction: column; }
    }