/* roulang page: index */
:root {
      --bg-deep: #0A0E17;
      --bg-panel: #070B12;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-border-hover: rgba(255, 255, 255, 0.2);
      --text-primary: #E8ECF1;
      --text-secondary: #8E9BAE;
      --text-muted: #5A6878;
      --accent-gold: #F0B90B;
      --accent-gold-glow: rgba(240, 185, 11, 0.4);
      --accent-cyan: #00D4FF;
      --accent-cyan-glow: rgba(0, 212, 255, 0.5);
      --border-radius-card: 16px;
      --border-radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .font-mono {
      font-family: var(--font-sans);
    }

    .font-mono, .data-number {
      font-family: var(--font-mono);
    }

    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--accent-gold);
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-card);
      transition: border 0.3s, transform 0.3s, background 0.2s;
    }
    .glass-card:hover {
      border-color: var(--glass-border-hover);
      transform: translateY(-5px);
    }

    /* 导航 */
    .navbar-top {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      position: fixed;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s;
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }
    .logo-text {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, #00D4FF 0%, #38BDF8 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .channel-row {
      background: var(--bg-panel);
      border-top: 1px solid rgba(255,255,255,0.03);
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      padding: 8px 0;
    }
    .nav-link-anchor {
      color: var(--text-secondary);
      padding: 8px 18px;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      transition: color 0.2s;
      text-decoration: none;
    }
    .nav-link-anchor:hover {
      color: var(--accent-cyan);
    }
    .nav-link-anchor.active {
      color: var(--accent-gold);
    }
    .nav-link-anchor.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 24px;
      height: 3px;
      background: var(--accent-gold);
      border-radius: 4px;
    }

    .btn-gold {
      background: linear-gradient(135deg, #F0B90B 0%, #FF8C00 100%);
      border: none;
      color: #0A0E17;
      font-weight: 700;
      border-radius: var(--border-radius-btn);
      padding: 14px 36px;
      box-shadow: 0 0 20px var(--accent-gold-glow);
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-gold:hover {
      box-shadow: 0 0 30px rgba(240,185,11,0.7);
      transform: translateY(-2px);
      color: #0A0E17;
    }
    .btn-outline-cyan {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      border-radius: var(--border-radius-btn);
      padding: 14px 36px;
      transition: 0.3s;
    }
    .btn-outline-cyan:hover {
      background: rgba(0,212,255,0.1);
      border-color: var(--accent-gold);
      color: var(--accent-gold);
    }

    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #0D1B2A 0%, #0A0E17 75%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid-bg {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background-image: radial-gradient(rgba(0,212,255,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }

    .dashboard-mock {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(24px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 24px;
      padding: 20px;
      transform: perspective(800px) rotateY(-4deg) rotateX(3deg);
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.6);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .mini-chart {
      height: 40px;
      background: linear-gradient(90deg, #00D4FF, #F0B90B);
      width: 80%;
      border-radius: 6px;
      opacity: 0.7;
    }
    .ring-chart {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      border: 4px solid rgba(0,212,255,0.4);
      border-top-color: #F0B90B;
      display: inline-block;
    }

    .data-highlight {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-cyan);
      text-shadow: 0 0 15px var(--accent-cyan-glow);
      line-height: 1.2;
    }

    .faq-accordion .accordion-button {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      color: var(--text-primary);
      font-weight: 600;
      border-radius: 12px !important;
      padding: 20px 24px;
    }
    .faq-accordion .accordion-button:not(.collapsed) {
      background: rgba(0,212,255,0.05);
      border-color: var(--accent-cyan);
      color: white;
      box-shadow: none;
    }
    .faq-accordion .accordion-body {
      background: rgba(10,14,23,0.8);
      color: #B0BEC5;
      border-radius: 0 0 12px 12px;
    }

    .footer-link {
      color: var(--text-secondary);
      transition: 0.2s;
    }
    .footer-link:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .data-highlight { font-size: 36px; }
      .navbar-nav-mobile { flex-direction: column; }
    }