/* roulang page: index */
:root {
      --deep-blue: #1A1F36;
      --racing-orange: #F85C3C;
      --track-white: #F9F9FB;
      --gold: #E5A93D;
      --graphite: #2E3340;
      --light-gray-blue: #E8ECF1;
      --white: #FFFFFF;
      --card-shadow: 0 8px 24px rgba(26,31,54,0.06);
      --card-hover-shadow: 0 16px 36px rgba(26,31,54,0.12);
      --border-radius-lg: 20px;
      --border-radius-md: 14px;
      --border-radius-sm: 8px;
      --transition: all 0.25s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --container-max: 1280px;
      --section-gap: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--track-white);
      color: var(--graphite);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航系统 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 76px;
      display: flex;
      align-items: center;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.98);
      border-bottom: 1px solid var(--light-gray-blue);
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
    }

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

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--deep-blue);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--racing-orange);
      font-weight: 700;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 1rem;
      color: var(--graphite);
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--racing-orange);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--racing-orange), var(--gold));
      color: white;
      font-weight: 600;
      padding: 12px 32px;
      border-radius: 50px;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 8px 18px rgba(248,92,60,0.25);
      display: inline-block;
      text-align: center;
      font-size: 1rem;
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 14px 24px rgba(248,92,60,0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--racing-orange);
      color: var(--racing-orange);
      font-weight: 600;
      padding: 10px 30px;
      border-radius: 50px;
      transition: var(--transition);
      cursor: pointer;
      display: inline-block;
      text-align: center;
      font-size: 1rem;
    }

    .btn-outline:hover {
      background: rgba(248,92,60,0.08);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-blue);
      cursor: pointer;
    }

    @media (max-width: 1023px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(26,31,54,0.95);
        backdrop-filter: blur(16px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 36px;
        z-index: 999;
        transform: translateX(100%);
        transition: transform 0.35s ease;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
      .mobile-menu a {
        color: white;
        font-size: 1.8rem;
        font-weight: 600;
      }
      .mobile-menu .close-btn {
        position: absolute;
        top: 28px;
        right: 28px;
        background: none;
        border: none;
        color: white;
        font-size: 2.2rem;
        cursor: pointer;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(180deg, #1A1F36 0%, #2E3340 100%);
      padding: 120px 0 80px;
      margin-top: 0;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background-image: repeating-linear-gradient(0deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 2px, transparent 2px, transparent 8px);
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1 1 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: 28px;
      box-shadow: 0 30px 40px rgba(0,0,0,0.4);
    }
    .badge-group {
      display: flex;
      gap: 24px;
      margin-top: 48px;
      flex-wrap: wrap;
    }
    .badge {
      background: rgba(248,92,60,0.15);
      backdrop-filter: blur(10px);
      color: white;
      padding: 8px 22px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 8px;
      border: 1px solid rgba(248,92,60,0.3);
    }

    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--deep-blue);
    }
    .section-desc {
      color: #5a5f6e;
      max-width: 680px;
      margin-bottom: 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--border-radius-lg);
      padding: 0 0 24px;
      border: 1px solid var(--light-gray-blue);
      transition: var(--transition);
      overflow: hidden;
    }
    .service-card:hover {
      border-color: var(--racing-orange);
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-6px);
    }
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    }
    .service-content {
      padding: 24px 24px 8px;
    }
    .service-content h3 {
      font-size: 1.5rem;
      margin-bottom: 10px;
    }

    .advantages {
      background: var(--deep-blue);
      color: white;
      border-radius: 48px 48px 0 0;
    }
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-item {
      background: rgba(255,255,255,0.05);
      border-radius: 100px;
      padding: 28px 12px;
    }
    .stat-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--racing-orange);
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 32px;
    }
    .case-card {
      background: white;
      border-radius: var(--border-radius-lg);
      display: flex;
      border:1px solid var(--light-gray-blue);
      overflow: hidden;
      transition: var(--transition);
    }
    .case-card:hover {
      border-color: var(--racing-orange);
      box-shadow: var(--card-hover-shadow);
    }
    .case-img {
      width: 200px;
      background-size: cover;
    }

    .steps {
      display: flex;
      justify-content: space-between;
      background: #fff;
      border-radius: 28px;
      padding: 32px;
    }
    .faq-item {
      background: white;
      border:1px solid var(--light-gray-blue);
      border-radius: 16px;
      margin-bottom: 16px;
      padding: 16px 24px;
      cursor: pointer;
    }
    .faq-item.active {
      border-color: var(--racing-orange);
    }
    .contact-wrapper {
      display: flex;
      gap: 40px;
      background: white;
      border-radius: 32px;
      padding: 48px;
    }
    footer {
      background: var(--deep-blue);
      color: #ccc;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .stat-grid { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.5rem; }
    }
    @media (max-width: 768px) {
      .grid-3, .stat-grid, .case-grid { grid-template-columns: 1fr; }
      .container { padding: 0 20px; }
      .hero-content { flex-direction: column; }
      .contact-wrapper { flex-direction: column; }
      .steps { flex-direction: column; gap: 24px; }
    }