/* roulang page: index */
:root {
      --primary: #E33B1E;
      --primary-dark: #C5300F;
      --secondary: #1A1A2E;
      --accent: #00D2FF;
      --bg-light: #F5F7FB;
      --card-bg: #FFFFFF;
      --dark-card: #16213E;
      --text-main: #1A1A2E;
      --text-muted: #5A6070;
      --text-white: #FFFFFF;
      --border-light: #E2E8F0;
      --gradient-primary: linear-gradient(135deg, #E33B1E 0%, #FF6B4A 100%);
      --gradient-dark: linear-gradient(135deg, #1A1A2E 0%, #0F3460 100%);
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);
      --shadow-btn: 0 4px 12px rgba(227, 59, 30, 0.3);
      --radius-card: 20px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    a {
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 SaaS 命令栏风格 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
      z-index: 1050;
      display: flex;
      align-items: center;
      padding: 0 2rem;
      transition: box-shadow 0.3s;
    }

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

    .nav-logo {
      font-size: 1.6rem;
      font-weight: 800;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
      margin-right: auto;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-left: 2rem;
    }

    .search-toggle {
      background: var(--bg-light);
      border: none;
      width: 40px;
      height: 40px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      cursor: pointer;
      transition: 0.2s;
    }

    .search-toggle:hover {
      color: var(--primary);
      background: #e9ecef;
    }

    .search-input-group {
      display: none;
      position: absolute;
      right: 160px;
      top: 16px;
    }

    .search-input-group.active {
      display: block;
    }

    .search-input-group input {
      background: var(--bg-light);
      border: 1px solid var(--border-light);
      border-radius: 20px;
      padding: 0.5rem 1rem;
      width: 200px;
      outline: none;
      transition: 0.2s;
    }

    .btn-primary-custom {
      background: var(--gradient-primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-btn);
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary-custom:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 18px rgba(227, 59, 30, 0.4);
      color: white;
      transform: translateY(-1px);
    }

    .btn-outline-light-custom {
      border: 1.5px solid white;
      background: transparent;
      color: white;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: 0.25s;
    }

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

    /* 移动端导航 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-main);
    }

    @media (max-width: 991px) {
      .nav-links, .nav-actions .btn-primary-custom {
        display: none;
      }
      .menu-toggle {
        display: block;
        margin-left: 1rem;
      }
      .nav-actions {
        margin-left: 0;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        display: none;
        border-bottom: 1px solid #eee;
        z-index: 1040;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-size: 1.2rem;
        color: var(--text-main);
      }
    }

    /* Hero 深色动态背景 */
    .hero-section {
      background: var(--gradient-dark);
      position: relative;
      overflow: hidden;
      padding: 8rem 0 6rem;
      margin-top: 72px;
      color: white;
    }

    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-title {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-title span {
      color: var(--accent);
    }

    .section-padding {
      padding: 5rem 0;
    }

    .card-custom {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
      border: none;
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .icon-badge {
      width: 50px;
      height: 50px;
      background: rgba(0,210,255,0.1);
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), #FF6B4A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      color: var(--text-muted);
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }

    footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.7);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
    }