/* roulang page: index */
:root {
      --deep-indigo: #0B0F2B;
      --dark-slate: #1A1F3A;
      --electric-cyan: #00F0FF;
      --vivid-orange: #FF6B35;
      --white-soft: #F5F7FC;
      --gray-light: #B0B8D0;
      --gray-muted: #6B7280;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-border-hover: rgba(0, 240, 255, 0.3);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 18px rgba(0, 240, 255, 0.5);
      --glow-cyan-strong: 0 0 28px rgba(0, 240, 255, 0.7);
      --border-radius-lg: 20px;
      --border-radius-btn: 50px;
      --font-numbers: 'Rajdhani', 'Inter', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background: radial-gradient(circle at 30% 10%, #141B3A 0%, var(--deep-indigo) 75%);
      color: var(--white-soft);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      background-attachment: fixed;
      position: relative;
    }

    /* 网格纹理水印层 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
      opacity: 0.5;
    }

    /* 运动图标水印（低透明度） */
    body::after {
      content: "";
      position: fixed;
      bottom: 0;
      right: 0;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,240,255,0.02) 0%, transparent 70%);
      background-size: contain;
      background-repeat: no-repeat;
      pointer-events: none;
      z-index: 0;
    }

    .container, .container-fluid {
      position: relative;
      z-index: 2;
    }

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

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
    }

    .text-numbers {
      font-family: var(--font-numbers);
      font-weight: 600;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-lg);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
      transform: translateY(-4px);
    }

    .btn-primary-glow {
      background: linear-gradient(135deg, var(--electric-cyan), var(--vivid-orange));
      border: none;
      color: var(--deep-indigo);
      font-weight: 700;
      border-radius: var(--border-radius-btn);
      padding: 0.85rem 2.5rem;
      box-shadow: var(--glow-cyan);
      transition: var(--transition-smooth);
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-primary-glow:hover {
      box-shadow: var(--glow-cyan-strong);
      transform: scale(1.04);
      color: var(--deep-indigo);
      filter: brightness(1.05);
    }

    .btn-outline-cyan {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      font-weight: 600;
      border-radius: var(--border-radius-btn);
      padding: 0.85rem 2.5rem;
      transition: var(--transition-smooth);
    }

    .btn-outline-cyan:hover {
      background: rgba(0, 240, 255, 0.08);
      border-color: var(--electric-cyan);
      color: var(--electric-cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    /* 导航桌面 */
    .navbar-custom {
      background: rgba(11, 15, 43, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 0.8rem 0;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 1000;
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.8rem;
      color: white;
      letter-spacing: 1px;
      position: relative;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .navbar-brand span {
      position: relative;
    }

    .navbar-brand span::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 4px;
      width: 100%;
      height: 3px;
      background: var(--electric-cyan);
      box-shadow: 0 0 8px var(--electric-cyan);
      border-radius: 2px;
    }

    .nav-link {
      color: var(--gray-light) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: 0.2s;
      position: relative;
      padding: 0.5rem 0.8rem !important;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--electric-cyan) !important;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 20%;
      width: 60%;
      height: 2px;
      background: var(--electric-cyan);
      transform: scaleX(0);
      transition: transform 0.2s;
      box-shadow: 0 0 6px var(--electric-cyan);
    }

    .nav-link:hover::after, .nav-link.active::after {
      transform: scaleX(1);
    }

    /* 移动端底部Tab */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 15, 43, 0.9);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.1);
      z-index: 1000;
      justify-content: space-around;
      padding: 8px 0;
    }

    .mobile-tab {
      color: var(--gray-muted);
      text-decoration: none;
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      transition: 0.2s;
      position: relative;
      padding: 4px 0;
    }

    .mobile-tab i {
      font-size: 20px;
      margin-bottom: 2px;
    }

    .mobile-tab.active {
      color: var(--electric-cyan);
    }

    .mobile-tab.active::before {
      content: '';
      position: absolute;
      top: -8px;
      width: 30px;
      height: 3px;
      background: var(--electric-cyan);
      border-radius: 2px;
      box-shadow: 0 0 8px var(--electric-cyan);
    }

    section {
      padding: 100px 0;
      position: relative;
    }

    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .hero-overlay {
      background: rgba(11, 15, 43, 0.65);
      backdrop-filter: blur(4px);
      position: absolute;
      inset: 0;
    }

    .faq-accordion .accordion-button {
      background: transparent;
      color: white;
      font-weight: 600;
      border: none;
      box-shadow: none;
      padding: 1.2rem 0;
      font-size: 1.1rem;
    }

    .faq-accordion .accordion-item {
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .faq-accordion .accordion-button:not(.collapsed) {
      color: var(--electric-cyan);
      background: transparent;
      box-shadow: none;
    }

    .faq-accordion .accordion-button::after {
      filter: brightness(0) invert(1);
    }

    .faq-accordion .accordion-body {
      color: var(--gray-light);
      background: rgba(0,240,255,0.03);
      border-left: 3px solid var(--electric-cyan);
      padding: 1rem 1.5rem;
    }

    .form-control-glass {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      color: white;
      border-radius: 16px;
      padding: 0.8rem 1.2rem;
    }

    .form-control-glass:focus {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
      background: rgba(0,240,255,0.03);
    }

    footer a {
      color: var(--gray-light);
      text-decoration: none;
      transition: 0.2s;
    }

    footer a:hover {
      color: var(--electric-cyan);
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      section { padding: 60px 0; }
      .navbar-custom { display: none; }
      .mobile-bottom-nav { display: flex; }
    }