/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --dark-bg: #0F172A;
      --cyan: #00F0FF;
      --cyan-dark: #00A0B0;
      --warm-white: #F8FAFC;
      --text-body: #CBD5E1;
      --text-muted: #64748B;
      --border-light: rgba(255,255,255,0.08);
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --card-shadow: 0 20px 40px rgba(0,0,0,0.4);
      --glow-cyan: 0 0 30px rgba(0,240,255,0.15);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --transition: all 0.25s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-heading);
      background-color: var(--deep-blue);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 30% 10%, rgba(0,240,255,0.03) 0%, transparent 35%);
      background-attachment: fixed;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航白底风格 */
    .navbar-custom {
      background-color: #FFFFFF;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid #E2E8F0;
      padding: 12px 0;
      transition: var(--transition);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: #0F172A !important;
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }
    .panda-icon {
      font-size: 2rem;
      color: #0F172A;
    }
    .nav-link {
      color: #475569 !important;
      font-weight: 500;
      margin: 0 8px;
      position: relative;
      padding: 8px 4px !important;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-dark);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--cyan-dark) !important;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .search-box {
      border: 1px solid #CBD5E1;
      border-radius: 30px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      background: white;
      transition: border 0.2s;
    }
    .search-box input {
      border: none;
      outline: none;
      background: transparent;
      width: 140px;
      color: #0F172A;
    }
    .search-box:focus-within {
      border-color: var(--cyan);
    }
    .btn-glow {
      background: linear-gradient(135deg, var(--cyan) 0%, #0ea5e9 100%);
      border: none;
      color: #0F172A;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 40px;
      box-shadow: 0 0 15px rgba(0,240,255,0.5);
      transition: all 0.3s ease;
      letter-spacing: 0.5px;
    }
    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.8);
      transform: translateY(-2px);
      filter: brightness(1.1);
      color: #0F172A;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 10px 28px;
      border-radius: 40px;
      transition: all 0.3s;
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.15);
      border-color: var(--cyan);
      color: white;
    }
    /* 汉堡菜单适配 */
    .navbar-toggler {
      border: none;
      color: #0F172A;
    }
    @media (max-width: 992px) {
      .navbar-collapse {
        background: white;
        padding: 20px;
        border-radius: 16px;
        margin-top: 10px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
      }
      .search-box {
        width: 100%;
        margin: 10px 0;
      }
    }
    /* Hero */
    .hero-section {
      padding: 100px 0 90px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(6px);
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 800;
      color: white;
      letter-spacing: -0.5px;
      line-height: 1.2;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .hero-sub {
      font-size: 1.3rem;
      color: #CBD5E1;
      margin: 24px 0 32px;
    }
    .dashboard-mock {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(14px);
      border-radius: 24px;
      border: 1px solid var(--border-light);
      padding: 20px;
      max-width: 500px;
      margin-left: auto;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .hero-section {
        padding: 80px 0 60px;
        text-align: center;
      }
      .dashboard-mock {
        margin: 30px auto 0;
      }
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
    }
    .glass-card:hover {
      box-shadow: var(--card-shadow), var(--glow-cyan);
      border-color: rgba(0,240,255,0.25);
    }
    .solid-card {
      background: rgba(255,255,255,0.05);
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--cyan);
      line-height: 1.1;
    }
    /* faq手风琴 */
    .accordion-button {
      background: rgba(255,255,255,0.02);
      color: white;
      font-weight: 600;
      border: 1px solid transparent;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,240,255,0.05);
      border-color: var(--cyan);
      color: white;
    }
    .accordion-item {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.05);
      margin-bottom: 12px;
      border-radius: 20px !important;
      overflow: hidden;
    }
    .footer {
      background: #0A0E27;
      border-top: 1px solid rgba(255,255,255,0.06);
      padding: 48px 0 24px;
    }