/* roulang page: index */
/* :root 设计变量 */
    :root {
      --deep-bg: #0A0E1A;
      --surface-dark: #0F1629;
      --card-glass: rgba(15, 25, 45, 0.7);
      --glass-border: rgba(0, 194, 255, 0.25);
      --electric-blue: #00C2FF;
      --electric-blue-rgb: 0, 194, 255;
      --growth-green: #00E5A0;
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #8899AA;
      --font-mono: "SF Mono", "Menlo", "Consolas", "Courier New", monospace;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --border-radius-card: 16px;
      --border-radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 194, 255, 0.5);
      --transition-smooth: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #1a1f35, var(--deep-bg) 80%);
      color: var(--text-secondary);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
      position: relative;
    }

    /* 全局网格背景纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 194, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 194, 255, 0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: -1;
    }

    /* 低透明度圆形光斑 */
    .ambient-glow {
      position: fixed;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0, 194, 255, 0.08) 0%, transparent 70%);
      border-radius: 50%;
      filter: blur(80px);
      pointer-events: none;
      z-index: -2;
    }
    .glow-left {
      top: -200px;
      left: -150px;
    }
    .glow-right {
      bottom: -200px;
      right: -150px;
      background: radial-gradient(circle, rgba(0, 229, 160, 0.06) 0%, transparent 70%);
    }

    a {
      color: var(--electric-blue);
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    a:hover {
      color: #66d9ff;
    }

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

    /* 自定义容器微调 */
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* ----- 导航栏 (搜索主导) ----- */
    .navbar-custom {
      background: rgba(10, 14, 26, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 194, 255, 0.3);
      padding: 12px 0;
      position: sticky;
      top: 0;
      z-index: 1000;
      transition: var(--transition-smooth);
    }
    .logo-text {
      font-size: 28px;
      font-weight: 700;
      font-style: italic;
      color: #fff;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-text i {
      color: var(--electric-blue);
      font-size: 32px;
      transform: rotate(15deg);
    }
    .search-box-nav {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(0, 194, 255, 0.4);
      border-radius: 50px;
      padding: 10px 22px;
      display: flex;
      align-items: center;
      width: 100%;
      max-width: 380px;
      transition: all 0.25s;
    }
    .search-box-nav input {
      background: transparent;
      border: none;
      outline: none;
      color: #fff;
      width: 100%;
      font-size: 15px;
    }
    .search-box-nav input::placeholder {
      color: #7f8fa0;
      font-weight: 300;
    }
    .search-box-nav:focus-within {
      border-color: var(--electric-blue);
      box-shadow: 0 0 18px rgba(0, 194, 255, 0.6);
      background: rgba(255, 255, 255, 0.12);
    }
    .nav-link-custom {
      color: #ccddee !important;
      font-weight: 500;
      margin: 0 6px;
      padding: 8px 14px !important;
      border-radius: 30px;
      transition: var(--transition-smooth);
    }
    .nav-link-custom:hover {
      color: #fff !important;
      background: rgba(0, 194, 255, 0.15);
    }
    .nav-link-custom.active {
      color: #fff !important;
      background: rgba(0, 194, 255, 0.25);
    }
    /* 移动端汉堡菜单调整 */
    @media (max-width: 991px) {
      .search-box-nav {
        margin: 10px 0;
        max-width: 100%;
      }
    }

    /* 板块通用间距 */
    section {
      padding: 90px 0;
      position: relative;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* 标题装饰线 */
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: #fff;
      text-align: center;
      margin-bottom: 16px;
    }
    .title-decor {
      width: 70px;
      height: 4px;
      background: var(--growth-green);
      margin: 0 auto 50px;
      border-radius: 4px;
      box-shadow: 0 0 12px rgba(0, 229, 160, 0.7);
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-glass);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      color: #fff;
    }
    .glass-card:hover {
      border-color: rgba(0, 194, 255, 0.6);
      box-shadow: 0 12px 40px rgba(0, 194, 255, 0.2);
      transform: translateY(-6px);
    }

    /* 按钮 */
    .btn-primary-glow {
      background: linear-gradient(135deg, #00C2FF, #0080FF);
      border: none;
      border-radius: 50px;
      padding: 14px 32px;
      font-weight: 600;
      color: #fff;
      box-shadow: 0 0 20px rgba(0, 194, 255, 0.5);
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary-glow:hover {
      box-shadow: 0 0 35px rgba(0, 194, 255, 0.8);
      transform: translateY(-2px);
      color: #fff;
    }
    .btn-outline-blue {
      background: transparent;
      border: 1.5px solid var(--electric-blue);
      border-radius: 50px;
      padding: 14px 32px;
      font-weight: 600;
      color: var(--electric-blue);
      transition: all 0.3s;
    }
    .btn-outline-blue:hover {
      background: rgba(0, 194, 255, 0.1);
      color: #fff;
      border-color: #fff;
    }

    /* Hero 指标卡片 */
    .metric-hero-card {
      background: rgba(20, 30, 50, 0.75);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 20px;
      padding: 18px 22px;
    }

    /* 数据看板数字 */
    .counter-font {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: #fff;
      letter-spacing: -1px;
    }

    /* FAQ手风琴自定义 */
    .accordion-faq .accordion-button {
      background: rgba(15, 25, 45, 0.8);
      color: #fff;
      font-weight: 600;
      border: none;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .accordion-faq .accordion-button:not(.collapsed) {
      background: rgba(0, 194, 255, 0.1);
      border-left: 4px solid var(--electric-blue);
      box-shadow: none;
    }
    .accordion-faq .accordion-body {
      background: rgba(10, 20, 35, 0.7);
      color: #CDE0F5;
    }

    /* 表单样式 */
    .form-control-dark {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(0,194,255,0.3);
      border-radius: 30px;
      color: #fff;
      padding: 12px 20px;
    }
    .form-control-dark:focus {
      border-color: var(--electric-blue);
      box-shadow: 0 0 15px rgba(0,194,255,0.4);
      background: rgba(255,255,255,0.1);
    }

    footer {
      background: #0b101f;
      border-top: 1px solid rgba(0,194,255,0.25);
    }
    .footer-link {
      color: #8899AA;
      transition: 0.2s;
    }
    .footer-link:hover {
      color: var(--electric-blue);
    }