/* roulang page: index */
:root {
      --primary: #0A1F3F;
      --primary-light: #1B3A5C;
      --primary-deep: #0F2645;
      --secondary: #FF6A3D;
      --secondary-hover: #E55A2B;
      --accent-green: #10B981;
      --accent-amber: #F59E0B;
      --bg-light: #F7F8FA;
      --card-bg: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(10,31,63,0.12), 0 2px 6px rgba(0,0,0,0.06);
      --shadow-lg: 0 20px 50px rgba(10,31,63,0.25);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --radius-capsule: 20px;
      --bs-primary: #0A1F3F;
      --bs-secondary: #FF6A3D;
      --bs-border-radius-lg: 16px;
      --bs-btn-border-radius: 10px;
      --bs-body-font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.8;
      letter-spacing: normal;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
    }

    /* 导航 */
    .navbar {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .navbar.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
    }

    .navbar-brand i {
      font-size: 1.8rem;
      margin-right: 6px;
      color: var(--secondary);
    }

    .nav-link {
      color: var(--text-main) !important;
      font-weight: 500;
      margin: 0 0.25rem;
      transition: 0.2s;
      position: relative;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--secondary) !important;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--secondary);
      border-radius: 2px;
    }

    .btn-cta {
      background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-hover) 100%);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--bs-btn-border-radius);
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(255,106,61,0.3);
    }

    .btn-cta:hover {
      background: linear-gradient(135deg, var(--secondary-hover) 0%, #d14a20 100%);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255,106,61,0.4);
      color: white;
    }

    .btn-outline-dark {
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--bs-btn-border-radius);
      padding: 0.6rem 1.8rem;
      transition: 0.2s;
    }

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

    /* Mega菜单 */
    .mega-menu {
      display: none;
      position: absolute;
      top: 100%;
      right: 0;
      width: 380px;
      background: white;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      padding: 1.5rem;
      z-index: 1000;
      border: 1px solid var(--border-light);
    }

    .nav-item.dropdown:hover .mega-menu {
      display: block;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--primary-deep) 100%);
      position: relative;
      overflow: hidden;
      padding: 6rem 0 5rem;
    }

    #hero::before {
      content: "";
      position: absolute;
      right: -100px;
      bottom: 0;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle at 30% 30%, rgba(255,106,61,0.25) 0%, transparent 70%);
      border-radius: 50%;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      color: white;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      color: rgba(255,255,255,0.85);
      font-size: 1.15rem;
      max-width: 450px;
    }

    .badge-capsule {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      border-radius: 30px;
      padding: 0.4rem 1.2rem;
      color: white;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      margin-right: 0.8rem;
    }

    .badge-capsule .number {
      font-weight: 700;
      font-size: 1.4rem;
      margin-right: 6px;
      color: var(--accent-green);
    }

    .hero-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-xl);
      padding: 1.5rem;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255,255,255,0.15);
    }

    /* 功能非对称 */
    .feature-left {
      border-right: 2px solid var(--border-light);
    }

    .feature-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: all 0.3s ease;
      border-left: 4px solid transparent;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-left: 4px solid var(--secondary);
    }

    /* 场景横向滚动 */
    .scenario-scroll {
      display: flex;
      overflow-x: auto;
      gap: 1.5rem;
      padding: 1rem 0.5rem 2rem;
      scrollbar-width: thin;
      scrollbar-color: var(--border-light) transparent;
    }

    .scenario-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .scenario-scroll::-webkit-scrollbar-thumb {
      background: var(--border-light);
      border-radius: 10px;
    }

    .scene-card {
      min-width: 300px;
      max-width: 320px;
      height: 380px;
      border-radius: 20px;
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      transition: 0.3s;
    }

    .scene-card:hover {
      transform: scale(1.03);
    }

    .scene-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 2rem 1.5rem;
      color: white;
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 2rem;
      border-left: 6px solid var(--primary);
    }

    .brand-logo {
      filter: grayscale(100%);
      opacity: 0.7;
      transition: 0.3s;
      max-height: 48px;
    }

    .brand-logo:hover {
      filter: grayscale(0%);
      opacity: 1;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      border-radius: var(--radius-md) !important;
      box-shadow: none;
      padding: 1.2rem 1.5rem;
    }

    .accordion-button:not(.collapsed) {
      color: var(--secondary);
      background: white;
      border-left: 4px solid var(--secondary);
    }

    /* 页脚 */
    footer {
      background: linear-gradient(135deg, var(--primary-deep), var(--primary));
      color: rgba(255,255,255,0.85);
    }

    .form-control {
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      padding: 0.7rem 1rem;
    }

    .form-control:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 0 0.2rem rgba(255,106,61,0.25);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .feature-left {
        border-right: none;
        border-bottom: 2px solid var(--border-light);
        padding-bottom: 1.5rem;
      }
    }