/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --secondary: #F5F0E8;
      --accent: #E85D04;
      --green: #3A7D44;
      --bg: #FAFAFA;
      --white: #FFFFFF;
      --border: #E5E5E5;
      --text: #333333;
      --text-light: #666666;
      --radius-sm: 8px;
      --radius: 16px;
      --radius-pill: 20px;
      --shadow: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --transition: 0.2s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.96);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 4px 10px rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 18px;
      box-shadow: 0 2px 8px rgba(232,93,4,0.3);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--primary);
      transition: color 0.2s;
      font-size: 15px;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .btn-nav {
      background: var(--accent);
      color: white !important;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-nav:hover {
      background: #C94D00;
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.3s;
      display: block;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateY(-100%);
      transition: 0.4s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary);
    }
    .mobile-menu .btn-nav {
      padding: 14px 32px;
      font-size: 18px;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .section-subtitle {
      color: var(--text-light);
      font-size: 18px;
      margin-bottom: 48px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #1A1A1A 0%, #2D2D2D 100%);
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .badge-group {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .badge {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(4px);
      padding: 12px 20px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      color: white;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .badge span {
      color: var(--accent);
      font-size: 24px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      border: none;
      padding: 14px 32px;
      border-radius: 12px;
      color: white;
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #C94D00;
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      padding: 14px 32px;
      border-radius: 12px;
      color: white;
      font-weight: 700;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hero-image {
      flex: 1 1 45%;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      transition: 0.2s;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    /* 产品矩阵 横向大卡 */
    .product-row {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .product-card {
      display: flex;
      background: var(--white);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: 0.2s;
    }
    .product-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .product-img {
      width: 45%;
      min-height: 240px;
      object-fit: cover;
    }
    .product-info {
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .product-info h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    .feature-list {
      list-style: none;
      margin: 12px 0 20px;
    }
    .feature-list li::before {
      content: "✓";
      color: var(--accent);
      margin-right: 8px;
      font-weight: bold;
    }

    /* 场景卡片 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .scene-card {
      background: var(--secondary);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .scene-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .scene-content {
      padding: 24px;
    }
    .tag {
      background: var(--green);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-right: 8px;
    }

    /* 数据墙 */
    .marquee-badges {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      white-space: nowrap;
    }
    .case-cards {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-left: 3px solid var(--accent);
      padding-left: 16px;
      cursor: pointer;
      transition: 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F9F9F9;
      border-radius: 8px;
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 16px;
    }

    /* CTA 横幅 */
    .cta-band {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      border-top: 4px solid var(--accent);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .copyright {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 16px;
      margin-top: 40px;
    }

    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero .container { flex-direction: column; }
      .product-card { flex-direction: column; }
      .product-img { width: 100%; }
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
      .features-grid, .scene-grid, .faq-grid, .case-cards { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }