/* roulang page: index */
/* ----- 设计变量 & Reset ----- */
    :root {
      --primary: #F04E23;
      --primary-dark: #D13E1B;
      --primary-light: #FFF0EC;
      --secondary: #1E1E1E;
      --accent: #F7B731;
      --white: #FFFFFF;
      --bg-light: #FAFAFA;
      --bg-gray: #F0F0F0;
      --text-dark: #1E1E1E;
      --text-body: #333333;
      --text-muted: #666666;
      --border-light: #E5E5E5;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.16);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --radius-pill: 50px;
      --font-h1: 800 48px/1.2 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-h2: 700 32px/1.3 'PingFang SC', sans-serif;
      --font-h3: 600 20px/1.4 'PingFang SC', sans-serif;
      --font-body: 400 16px/1.75 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-small: 500 13px/1.5 'PingFang SC', sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.75;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    ul {
      list-style: none;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      background: transparent;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 辅助装饰 */
    .section-label {
      color: var(--primary);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 8px;
      display: block;
    }
    .h2-decor {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 24px;
    }
    .h2-decor::before {
      content: '';
      width: 4px;
      height: 28px;
      background: var(--primary);
      border-radius: 2px;
    }
    /* ----- 导航栏 ----- */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      z-index: 999;
      transition: box-shadow 0.3s, background 0.3s;
    }
    .navbar.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
      background: rgba(255,255,255,0.98);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 24px;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--primary);
      transform: rotate(0deg);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      font-weight: 500;
      color: var(--text-dark);
      align-items: center;
    }
    .nav-links a {
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-capsule {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-weight: 600;
      transition: background 0.25s, transform 0.2s;
    }
    .btn-capsule:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 28px;
      height: 20px;
    }
    .hamburger span {
      display: block;
      width: 100%;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 4px;
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(240,78,35,0.98);
      backdrop-filter: blur(12px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      z-index: 1000;
      color: white;
      font-size: 22px;
      font-weight: 600;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      color: white;
      background: none;
      border: none;
    }
    /* ----- Hero 双栏 ----- */
    .hero {
      display: flex;
      align-items: center;
      min-height: 90vh;
      padding-top: 80px;
      background: var(--bg-light);
      overflow: hidden;
    }
    .hero-left {
      flex: 0 0 48%;
      padding-right: 32px;
    }
    .hero-badge {
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 600;
      font-size: 14px;
      padding: 4px 12px;
      border-radius: 30px;
      display: inline-block;
      margin-bottom: 20px;
    }
    .hero h1 {
      font: var(--font-h1);
      color: var(--secondary);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      box-shadow: 0 4px 12px rgba(240,78,35,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(240,78,35,0.35);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }
    .hero-stats {
      font-size: 14px;
      color: var(--text-muted);
    }
    .hero-right {
      flex: 0 0 52%;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 460px;
      border-radius: 24px;
      display: flex;
      align-items: flex-end;
      justify-content: flex-end;
      padding: 24px;
    }
    .data-card {
      background: rgba(30,30,30,0.85);
      backdrop-filter: blur(10px);
      color: white;
      padding: 16px 20px;
      border-radius: 16px;
      font-size: 14px;
      display: flex;
      gap: 20px;
    }
    .scrolling-bar {
      background: var(--secondary);
      color: white;
      padding: 12px 0;
      white-space: nowrap;
      overflow: hidden;
      font-weight: 600;
      letter-spacing: 2px;
    }
    /* ----- 核心优势网格 ----- */
    .features {
      padding: 80px 0;
      background: var(--bg-gray);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .feature-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-card:hover {
      background: #FFF5F2;
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    /* ----- 产品瀑布流 ----- */
    .products {
      padding: 80px 0;
    }
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .product-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .product-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .product-img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .product-card:hover .product-img {
      transform: scale(1.04);
    }
    .product-info {
      padding: 20px;
    }
    .badge {
      background: var(--primary);
      color: white;
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
    }
    /* ----- 方案对比表 ----- */
    .plans {
      padding: 80px 0;
      background: var(--bg-gray);
    }
    .table-wrapper {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 8px;
    }
    .plan-col {
      background: white;
      border-radius: 16px;
      padding: 28px;
      flex: 1;
      min-width: 240px;
      box-shadow: var(--shadow-sm);
    }
    .plan-col.recommend {
      border: 2px solid var(--accent);
      position: relative;
    }
    .recommend-badge {
      background: var(--accent);
      color: #1E1E1E;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      right: 16px;
    }
    /* ----- 案例看板 ----- */
    .cases {
      padding: 80px 0;
    }
    .scroll-horizontal {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 300px;
      background: white;
      border-radius: 16px;
      padding: 24px;
      scroll-snap-align: start;
    }
    /* ----- FAQ ----- */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    /* ----- CTA 横幅 ----- */
    .cta-banner {
      background: var(--secondary);
      color: white;
      padding: 80px 24px;
      text-align: center;
    }
    .pulse-btn {
      animation: pulse 2s infinite;
      background: var(--primary);
      color: white;
      padding: 18px 48px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 18px;
      transition: 0.2s;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(240,78,35,0.6); }
      70% { box-shadow: 0 0 0 15px rgba(240,78,35,0); }
      100% { box-shadow: 0 0 0 0 rgba(240,78,35,0); }
    }
    /* 页脚 */
    .footer {
      background: white;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1023px) {
      .hero { flex-direction: column; padding-top: 100px; }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .masonry { columns: 2; }
    }
    @media (max-width: 767px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .faq-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .table-wrapper { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }