/* roulang page: index */
:root {
      --bg-primary: #0A0E14;
      --bg-surface: #161B22;
      --accent-purple: #9D4EDD;
      --accent-mint: #2DE1C2;
      --alert-red: #FF6B6B;
      --text-primary: #FFFFFF;
      --text-secondary: #ADB5BD;
      --text-muted: #6C757D;
      --border-light: rgba(206, 212, 218, 0.15);
      --radius-xs: 8px;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-pill: 20px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 40px rgba(157, 78, 221, 0.15);
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
      --container-max: 1280px;
      --section-gap: 120px;
      --card-padding: 32px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-primary);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 20, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(157, 78, 221, 0.25);
      z-index: 1000;
      transition: var(--transition-smooth);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--text-primary);
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo span:first-child {
      color: var(--accent-purple);
    }
    .live-badge {
      background: var(--alert-red);
      color: white;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: var(--radius-pill);
      letter-spacing: 0.05em;
      animation: pulse-badge 2s infinite;
    }
    @keyframes pulse-badge {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.85; transform: scale(1.05); }
      100% { opacity: 1; transform: scale(1); }
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.9rem;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-purple);
    }
    .nav-cta {
      background: var(--accent-purple);
      color: white !important;
      padding: 10px 28px !important;
      border-radius: var(--radius-xs);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(157, 78, 221, 0.4);
      transition: var(--transition-smooth);
    }
    .nav-cta:hover {
      background: white;
      color: var(--accent-purple) !important;
      box-shadow: 0 6px 20px rgba(157, 78, 221, 0.6);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition-smooth);
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background-color: var(--bg-primary);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(157, 78, 221, 0.12) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: clamp(3rem, 6vw, 4.5rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.03em;
      color: var(--text-primary);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-purple);
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-xs);
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: white;
      color: var(--accent-purple);
      box-shadow: 0 8px 25px rgba(157, 78, 221, 0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--text-secondary);
      color: var(--text-primary);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-xs);
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      border-color: var(--accent-purple);
      background: var(--accent-purple);
      color: white;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-md);
      height: 380px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      position: relative;
    }

    /* 实时数据看板 */
    .dashboard {
      padding: 80px 0;
    }
    .section-title {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
    }
    .scroll-hint {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
      scrollbar-color: var(--accent-purple) var(--bg-surface);
    }
    .scroll-hint::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-hint::-webkit-scrollbar-thumb {
      background: var(--accent-purple);
      border-radius: 3px;
    }
    .stat-card {
      background: var(--bg-surface);
      border-left: 4px solid var(--accent-purple);
      border-radius: var(--radius-md);
      padding: 28px 32px;
      min-width: 260px;
      flex-shrink: 0;
      transition: var(--transition-smooth);
    }
    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text-primary);
      font-family: 'Inter', sans-serif;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin: 8px 0 12px;
    }
    .trend-up { color: var(--accent-mint); }
    .trend-down { color: var(--alert-red); }

    /* 核心服务矩阵 */
    .services {
      padding: 100px 0;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-surface);
      border-radius: var(--radius-sm);
      padding: var(--card-padding);
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(157, 78, 221, 0.3);
    }
    .service-card.featured {
      grid-column: span 2;
      background: linear-gradient(145deg, #1A1F2B 0%, #0F131A 100%);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--accent-purple);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 12px;
    }

    /* 对比区域 */
    .comparison {
      padding: 100px 0;
      background: var(--bg-surface);
      border-radius: 24px;
      margin: 40px auto;
      max-width: var(--container-max);
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 40px;
      align-items: center;
      padding: 60px 40px;
    }
    .vs-divider {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-purple);
    }
    .legacy-list, .vstation-list {
      list-style: none;
      margin-top: 20px;
    }
    .legacy-list li {
      color: var(--text-muted);
      text-decoration: line-through;
      margin-bottom: 12px;
    }
    .vstation-list li {
      color: var(--accent-mint);
      font-weight: 500;
      margin-bottom: 12px;
    }

    /* FAQ */
    .faq {
      padding: 100px 0;
    }
    .accordion-item {
      background: var(--bg-surface);
      border-radius: var(--radius-xs);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .accordion-btn {
      width: 100%;
      background: none;
      border: none;
      color: var(--text-primary);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 20px 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .accordion-content {
      padding: 0 28px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .accordion-item.active .accordion-content { display: block; }

    /* CTA 表单 */
    .cta-section {
      padding: 80px 0;
      display: flex;
      justify-content: center;
    }
    .form-card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 48px;
      max-width: 600px;
      width: 100%;
      box-shadow: var(--shadow-card);
    }
    .countdown {
      color: var(--alert-red);
      font-weight: 700;
      font-size: 1.5rem;
      margin-bottom: 24px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group input, .form-group textarea {
      width: 100%;
      background: var(--bg-primary);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-xs);
      padding: 14px;
      color: white;
      outline: none;
      transition: var(--transition-smooth);
    }
    .form-group input:focus {
      border-color: var(--accent-purple);
    }
    .btn-full {
      width: 100%;
      background: var(--accent-purple);
      color: white;
      font-weight: 700;
      padding: 16px;
      border: none;
      border-radius: var(--radius-xs);
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-full:hover {
      background: white;
      color: var(--accent-purple);
    }

    /* 页脚 */
    .footer {
      border-top: 1px solid var(--border-light);
      padding: 32px 0;
      display: flex;
      justify-content: space-between;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .compare-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .service-grid { grid-template-columns: 1fr; }
      .service-card.featured { grid-column: span 1; }
      .hero { padding: 120px 0 60px; }
    }