/* roulang page: index */
:root {
      --deep-space: #0B0C10;
      --dark-panel: #15171E;
      --glass-bg: rgba(21, 23, 30, 0.6);
      --electric-cyan: #00F2FE;
      --aurora-blue: #4FACFE;
      --violet: #B224EF;
      --accent-pink: #FF2D55;
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.75);
      --text-muted: rgba(255, 255, 255, 0.5);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 242, 254, 0.3);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 242, 254, 0.5);
      --radius-xl: 20px;
      --radius-pill: 50px;
      --transition-smooth: all 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      background-color: var(--deep-space);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.8;
      font-size: 16px;
      overflow-x: hidden;
    }

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

    /* 导航栏 */
    .navbar {
      background: rgba(11, 12, 16, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-subtle);
      transition: var(--transition-smooth);
      padding: 0.8rem 0;
    }
    .navbar.scrolled {
      background: rgba(11, 12, 16, 0.92);
      box-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--electric-cyan), var(--aurora-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      background: linear-gradient(135deg, var(--electric-cyan), var(--violet));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      font-size: 28px;
    }
    .nav-link {
      color: rgba(255,255,255,0.7) !important;
      font-weight: 500;
      font-size: 14px;
      margin: 0 10px;
      padding: 8px 0 !important;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--electric-cyan) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      box-shadow: 0 0 12px var(--electric-cyan);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .offcanvas {
      background: rgba(11, 12, 16, 0.95);
      backdrop-filter: blur(25px);
    }
    .offcanvas .nav-link {
      font-size: 16px;
      margin: 12px 0;
    }

    /* 按钮 */
    .btn-primary-glow {
      background: linear-gradient(135deg, var(--electric-cyan), var(--aurora-blue));
      border: none;
      color: #fff;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 12px 32px;
      box-shadow: 0 4px 15px rgba(0,242,254,0.3);
      transition: var(--transition-smooth);
      letter-spacing: 0.5px;
    }
    .btn-primary-glow:hover {
      background: linear-gradient(135deg, #33f5ff, #6bbfff);
      box-shadow: var(--shadow-glow);
      transform: translateY(-2px);
      color: #fff;
    }
    .btn-outline-glow {
      background: transparent;
      border: 1px solid transparent;
      background-image: linear-gradient(rgba(11,12,16,0.8), rgba(11,12,16,0.8)), linear-gradient(135deg, var(--electric-cyan), var(--violet));
      background-origin: border-box;
      background-clip: padding-box, border-box;
      color: #fff;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 12px 32px;
      transition: var(--transition-smooth);
      backdrop-filter: blur(10px);
    }
    .btn-outline-glow:hover {
      background-image: linear-gradient(rgba(21,23,30,0.9), rgba(21,23,30,0.9)), linear-gradient(135deg, var(--electric-cyan), var(--violet));
      color: #fff;
      box-shadow: 0 0 18px rgba(178,36,239,0.4);
      transform: translateY(-2px);
    }

    /* 卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .glass-card:hover {
      border-color: var(--border-glow);
      box-shadow: 0 12px 40px rgba(0,242,254,0.2);
      transform: translateY(-4px);
    }
    .icon-glow {
      font-size: 48px;
      background: linear-gradient(135deg, var(--electric-cyan), var(--aurora-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 16px;
      display: inline-block;
    }

    /* 案例卡片 */
    .case-card {
      background: rgba(21,23,30,0.7);
      backdrop-filter: blur(15px);
      border-radius: var(--radius-xl);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .case-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,242,254,0.4);
      box-shadow: 0 20px 35px rgba(0,0,0,0.7);
    }
    .case-img {
      height: 200px;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .tag-pill {
      background: rgba(255,255,255,0.08);
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 12px;
      color: var(--text-secondary);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 表格样式 */
    .compare-table {
      background: transparent;
      color: #fff;
    }
    .compare-table th {
      background: rgba(21,23,30,0.8);
      font-weight: 600;
      border-bottom: 1px solid rgba(255,255,255,0.15);
    }
    .highlight-col {
      border: 1px solid var(--electric-cyan);
      box-shadow: 0 0 25px rgba(0,242,254,0.25);
      background: rgba(0,242,254,0.05);
    }

    /* FAQ */
    .accordion-button {
      background: rgba(21,23,30,0.8);
      color: #fff;
      font-weight: 500;
      border: 1px solid transparent;
      transition: 0.25s;
      border-radius: 16px !important;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(21,23,30,0.95);
      color: var(--electric-cyan);
      border-color: rgba(0,242,254,0.4);
      box-shadow: 0 0 12px rgba(0,242,254,0.2);
    }
    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 16px;
    }

    /* 区块间距 */
    section {
      padding: 90px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 32px !important;
      }
      h2 {
        font-size: 28px !important;
      }
      .navbar .logo {
        font-size: 20px;
      }
    }