/* roulang page: index */
:root {
      --primary: #0A0E17;
      --accent: #E62E2E;
      --secondary: #1A1F2B;
      --border: #2A2F3D;
      --victory: #00F0A8;
      --bg: #05070A;
      --text: #F2F2F2;
      --text-muted: #9CA3AF;
      --text-weak: #6B7280;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-nav: 40px;
      --shadow-card: 0 0 0 1px rgba(255,255,255,0.05), 0 4px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 8px 40px rgba(0,0,0,0.6);
      --spacing: 24px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
      background-color: var(--bg);
      color: var(--text);
      margin: 0;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 var(--spacing);
    }
    /* 导航 Dock */
    .nav-dock {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 50;
      background: rgba(10,14,23,0.85);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-nav);
      padding: 8px 24px;
      max-width: 720px;
      width: 90vw;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      box-shadow: 0 10px 25px -5px rgba(0,0,0,0.5);
    }
    .nav-dock.scrolled {
      background: rgba(10,14,23,0.95);
      box-shadow: 0 10px 30px -10px rgba(0,0,0,0.8);
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.3s;
      margin: 0 12px;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: white;
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.3rem;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
    }
    .logo-dot {
      width: 8px;
      height: 8px;
      background: var(--victory);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 12px #00F0A8;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.3s;
      letter-spacing: 0.5px;
      box-shadow: 0 0 15px rgba(230,46,46,0.3);
    }
    .btn-primary:hover {
      background: #C71E1E;
      box-shadow: 0 0 25px rgba(230,46,46,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--border);
      color: white;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s;
    }
    .btn-outline:hover {
      border-color: white;
      background: rgba(255,255,255,0.05);
    }
    /* Hero粒子背景 */
    .hero-bg {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 50% 40%, rgba(20,30,50,0.7) 0%, #05070A 80%);
      overflow: hidden;
    }
    .particle {
      position: absolute;
      background: rgba(255,255,255,0.15);
      border-radius: 50%;
      animation: floatUp 8s infinite ease-in;
      width: 2px;
      height: 2px;
      box-shadow: 0 0 10px rgba(0,240,168,0.5);
    }
    @keyframes floatUp {
      0% { transform: translateY(100vh) scale(0); opacity: 0; }
      20% { opacity: 1; }
      80% { opacity: 0.5; }
      100% { transform: translateY(-10vh) scale(1.5); opacity: 0; }
    }
    .h1-title {
      font-size: 56px;
      line-height: 1.1;
      font-weight: 800;
      letter-spacing: -0.02em;
    }
    .h2-title {
      font-size: 40px;
      line-height: 1.2;
      font-weight: 700;
    }
    .h3-title {
      font-size: 22px;
      line-height: 1.3;
      font-weight: 600;
    }
    .stat-number {
      font-size: 48px;
      line-height: 1;
      font-weight: 900;
      font-family: 'SF Mono', 'Inter', monospace;
      color: var(--victory);
    }
    .card-service {
      background: var(--secondary);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.4s ease-out;
      border: 1px solid transparent;
    }
    .card-service:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(255,255,255,0.15);
    }
    .faq-item {
      border-left: 3px solid var(--border);
      transition: border-color 0.3s;
      padding-left: 20px;
    }
    .faq-item.active {
      border-left-color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .compare-check {
      color: var(--victory);
    }
    .compare-cross {
      color: var(--text-weak);
    }
    footer a {
      color: var(--text-muted);
      text-decoration: none;
    }
    footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      .h1-title { font-size: 36px; }
      .h2-title { font-size: 28px; }
      .nav-dock { padding: 8px 16px; width: 95vw; }
      .nav-links a { margin: 0 6px; font-size: 0.8rem; }
      .stat-number { font-size: 36px; }
    }
    @media (max-width: 480px) {
      .nav-links { display: none; }
      .nav-dock { justify-content: space-between; }
      .stat-grid { grid-template-columns: repeat(2, 1fr); }
    }