/* roulang page: index */
:root {
      --primary: #FF6A3D;
      --primary-dark: #E55A2B;
      --secondary: #2D1B4E;
      --gold: #D4AF37;
      --bg-warm: #FBF9F6;
      --card-bg: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --border-light: #E8E3DD;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-lg: 16px;
      --radius-btn: 10px;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 32px;
      padding-right: 32px;
    }

    @media (max-width: 768px) {
      .container-custom {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 50;
      border-bottom: 1px solid var(--border-light);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      text-decoration: none;
      color: var(--text-dark);
    }

    .logo-text {
      font-size: 24px;
      font-weight: 800;
      letter-spacing: -0.3px;
      color: var(--text-dark);
    }

    .logo-highlight {
      color: var(--primary);
    }

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

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      text-decoration: none;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }

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

    .nav-link.active {
      color: var(--primary);
      font-weight: 600;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon-btn {
      background: none;
      border: none;
      color: var(--text-body);
      font-size: 18px;
      cursor: pointer;
      transition: color var(--transition);
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
    }

    .search-icon-btn:hover {
      color: var(--primary);
      background: rgba(255,106,61,0.08);
    }

    .btn-primary-sm {
      background: linear-gradient(135deg, #FF6A3D, #E55A2B);
      color: white;
      border: none;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: all var(--transition);
      white-space: nowrap;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary-sm:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--secondary);
      padding: 24px 20px;
      flex-direction: column;
      gap: 20px;
      z-index: 49;
      backdrop-filter: blur(4px);
    }

    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
      text-decoration: none;
      transition: color var(--transition);
    }

    .mobile-menu a:hover {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .nav-links, .nav-right .btn-primary-sm {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu.show {
        display: flex;
      }
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 0 0 55%;
    }

    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }

    .hero-image {
      width: 100%;
      border-radius: 32px;
      filter: drop-shadow(0 20px 30px rgba(45,27,78,0.15));
    }

    .hero-glow {
      position: absolute;
      top: 10%;
      right: 5%;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(255,106,61,0.15) 0%, transparent 70%);
      border-radius: 50%;
      z-index: -1;
    }

    h1 {
      font-size: 48px;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: var(--text-dark);
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
    }

    .btn-primary {
      background: linear-gradient(135deg, #FF6A3D, #E55A2B);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-block;
      text-decoration: none;
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all var(--transition);
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(255,106,61,0.08);
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
      }
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      padding: 32px;
    }

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

    .feature-icon {
      width: 48px;
      height: 48px;
      color: var(--primary);
      transition: color var(--transition);
    }

    .card:hover .feature-icon {
      color: var(--secondary);
    }

    .scenario-card {
      background: #F5F2ED;
      border-radius: 16px;
      padding: 24px;
      transition: all var(--transition);
    }

    .scenario-card:hover {
      background: white;
      box-shadow: var(--shadow-sm);
    }

    .case-data {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #F5F2ED;
      border-radius: 10px;
      margin-bottom: 8px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px 20px;
    }

    .cta-section {
      background: linear-gradient(135deg, #2D1B4E, #FF6A3D);
      border-radius: 32px;
      padding: 64px 32px;
    }

    footer {
      background: #1A1A1A;
      color: #9CA3AF;
    }