/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary: #3B5998;
      --primary-dark: #2d4373;
      --accent: #FF6B6B;
      --accent-hover: #ff5252;
      --bg: #F7F8FA;
      --card-bg: #FFFFFF;
      --text-main: #1E293B;
      --text-soft: #64748B;
      --success: #10B981;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px -5px rgba(59,89,152,0.12), 0 4px 10px -6px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a {
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .search-box {
      display: flex;
      align-items: center;
      background: rgba(241,245,249,0.8);
      border-radius: 20px;
      padding: 0.4rem 1rem;
      margin-left: 1rem;
      border: 1px solid transparent;
      transition: all 0.2s;
    }
    .search-box i {
      color: var(--text-soft);
      font-size: 0.9rem;
      margin-right: 6px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.9rem;
      width: 140px;
      color: var(--text-main);
    }
    .search-box input::placeholder {
      color: #94a3b8;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: background 0.25s, transform 0.1s;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--accent);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      right: 0;
      width: 280px;
      background: white;
      height: calc(100vh - 64px);
      box-shadow: -4px 0 15px rgba(0,0,0,0.05);
      flex-direction: column;
      padding: 2rem;
      gap: 1.5rem;
      z-index: 40;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    @media (max-width: 768px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: flex;
      }
      .nav-container .btn-primary {
        display: none;
      }
      .mobile-menu .btn-primary {
        display: inline-block;
        width: 100%;
      }
    }
    /* Hero 双栏 */
    .hero-section {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, #f0f4ff 0%, #ffffff 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 0 0 58%;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero-right .data-card-stack {
      background: white;
      border-radius: 20px;
      padding: 1.5rem;
      box-shadow: 0 20px 35px rgba(59,89,152,0.15);
      position: relative;
      z-index: 2;
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }
    .hero-bg-decor {
      position: absolute;
      top: -20px;
      right: -20px;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      opacity: 0.15;
      z-index: 1;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
    }
    /* 卡片网格 2大4小 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 2rem;
    }
    .feature-large {
      grid-column: span 2;
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      display: flex;
      gap: 1.5rem;
      align-items: center;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .feature-large:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .feature-small {
      background: white;
      border-radius: var(--radius-card);
      padding: 1.8rem 1.2rem;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .feature-small:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    @media (max-width: 1024px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-large {
        grid-column: span 2;
      }
    }
    @media (max-width: 640px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-large {
        grid-column: span 1;
        flex-direction: column;
        text-align: center;
      }
    }
    /* 瀑布流案例 */
    .case-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .case-card img {
      width: 100%;
      display: block;
      transition: transform 0.4s ease;
    }
    .case-card:hover img {
      transform: scale(1.04);
    }
    @media (max-width: 1024px) {
      .case-masonry {
        columns: 2;
      }
    }
    @media (max-width: 640px) {
      .case-masonry {
        columns: 1;
      }
    }
    /* 对比表格 */
    .compare-table {
      display: flex;
      gap: 0;
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-col {
      flex: 1;
      padding: 2.5rem 2rem;
    }
    .compare-col.featured {
      background: #f8faff;
    }
    .divider {
      width: 1px;
      background: var(--border-light);
    }
    @media (max-width: 768px) {
      .compare-table {
        flex-direction: column;
      }
      .divider {
        height: 1px;
        width: 100%;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, opacity 0.3s;
      opacity: 0;
      color: var(--text-soft);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      opacity: 1;
      margin-top: 0.8rem;
    }
    .faq-item.active i {
      transform: rotate(180deg);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #3B5998 0%, #2d4373 100%);
      border-radius: 24px;
      padding: 4rem 2rem;
      text-align: center;
      color: white;
    }
    footer a:hover {
      color: var(--accent);
    }