/* roulang page: index */
:root {
      --primary: #E94E1F;
      --primary-dark: #C83E16;
      --primary-glow: rgba(233, 78, 31, 0.3);
      --secondary-dark: #1A1C2B;
      --secondary-accent: #FFD15C;
      --bg-light: #F9FAFB;
      --bg-white: #FFFFFF;
      --text-dark: #1F2937;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --border-hover: rgba(233, 78, 31, 0.3);
      --shadow-sm: 0 4px 12px rgba(26, 28, 43, 0.06);
      --shadow-hover: 0 8px 24px rgba(233, 78, 31, 0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-search: 24px;
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-en: 'Inter', sans-serif;
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    /* 导航栏 - 搜索主导 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.05);
      z-index: 1000;
      padding: 16px 0;
      transition: all 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      gap: 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--secondary-dark);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }

    .search-wrapper {
      flex: 1;
      max-width: 480px;
      position: relative;
      margin: 0 16px;
    }

    .search-input {
      width: 100%;
      padding: 12px 20px 12px 48px;
      border-radius: var(--radius-search);
      border: 1px solid var(--border-light);
      background: #F3F4F6;
      font-size: 15px;
      outline: none;
      transition: all 0.2s ease;
      font-family: var(--font-body);
    }

    .search-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(233, 78, 31, 0.2);
      background: white;
    }

    .search-icon {
      position: absolute;
      left: 18px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--primary);
      font-size: 1.1rem;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      font-weight: 600;
      color: var(--text-dark);
      white-space: nowrap;
    }

    .nav-links a {
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--secondary-dark);
      cursor: pointer;
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 2.2rem;
      margin-bottom: 16px;
      color: var(--secondary-dark);
      text-align: center;
    }

    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1C2B 0%, #2D3047 100%);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
      color: white;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: -20%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(233,78,31,0.3) 0%, transparent 70%);
      border-radius: 50%;
      filter: blur(60px);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 3rem;
      line-height: 1.3;
      margin-bottom: 20px;
      color: white;
    }

    .hero p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.2s ease;
      font-size: 1rem;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 18px var(--primary-glow);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }

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

    .hero-image {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.4);
    }

    /* 功能分组 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      margin-top: 20px;
    }

    .feature-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

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

    .feature-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .feature-card h3 {
      font-weight: 700;
      font-size: 1.4rem;
      margin-bottom: 10px;
    }

    /* 场景卡片 图文叠加 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scenario-card {
      position: relative;
      border-radius: 12px;
      overflow: hidden;
      aspect-ratio: 16/9;
      background: #1A1C2B;
    }

    .scenario-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .scenario-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(26,28,43,0.8));
      padding: 24px;
      color: white;
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      scroll-snap-align: start;
    }

    .stat-number {
      font-family: var(--font-en);
      font-weight: 800;
      font-size: 2rem;
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .cta-banner {
      background: #1A1C2B;
      text-align: center;
      padding: 80px 20px;
      color: white;
    }

    footer {
      background: #11131E;
      color: #9CA3AF;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .scenarios-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .search-wrapper {
        max-width: 100%;
      }
      .features-grid {
        grid-template-columns: 1fr;
      }
      .scenarios-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 2rem;
      }
    }