/* roulang page: index */
/* CSS 变量与设计系统 */
    :root {
      --bg-deep: #0A0B10;
      --accent-pink: #E5007E;
      --data-cyan: #00F0FF;
      --card-bg: #1A1C23;
      --text-body: #E0E2E8;
      --text-muted: #9CA3AF;
      --border-subtle: #2D3039;
      --radius-card: 8px;
      --radius-btn: 4px;
      --font-mono: 'Courier New', 'Roboto Mono', monospace;
      --shadow-glow-cyan: 0 0 15px rgba(0, 240, 255, 0.2);
      --shadow-glow-pink: 0 0 20px rgba(229, 0, 126, 0.3);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      margin: 0;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    /* 等宽数字 */
    .mono, .data-number, .stat-value {
      font-family: var(--font-mono);
    }

    /* 容器 */
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航自定义 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 11, 16, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      transition: background 0.3s ease;
    }
    .nav-link {
      position: relative;
      color: var(--text-body);
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-pink);
      transition: width 0.2s ease;
    }
    .nav-link:hover {
      color: white;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .logo-text {
      font-weight: 900;
      letter-spacing: -0.5px;
      color: white;
    }
    .logo-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--accent-pink);
      border-radius: 50%;
      margin-left: 4px;
      box-shadow: 0 0 10px var(--accent-pink);
      animation: pulse-dot 1.8s infinite;
    }
    @keyframes pulse-dot {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.6; transform: scale(1.3); }
      100% { opacity: 1; transform: scale(1); }
    }

    /* 按钮 */
    .btn-primary {
      background: var(--accent-pink);
      color: white;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.8rem;
      transition: all 0.2s;
      box-shadow: 0 4px 14px rgba(229, 0, 126, 0.4);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #ff1a8c;
      box-shadow: 0 6px 20px rgba(229, 0, 126, 0.6);
      transform: translateY(-1px);
    }
    .btn-outline-cyan {
      border: 1px solid var(--data-cyan);
      color: var(--data-cyan);
      background: transparent;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.8rem;
      transition: all 0.2s;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-outline-cyan:hover {
      background: rgba(0, 240, 255, 0.08);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
    }

    /* 卡片与组件 */
    .card-dark {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-subtle);
      transition: all 0.25s;
    }
    .card-dark:hover {
      border-color: var(--data-cyan);
      box-shadow: var(--shadow-glow-cyan);
    }
    .service-card-large {
      border-left: 4px solid var(--data-cyan);
    }
    .service-card-small {
      border-left: 4px solid transparent;
    }
    .service-card-small:hover {
      border-left-color: var(--accent-pink);
    }

    /* 对比滑块模拟 */
    .compare-badge {
      background: var(--accent-pink);
      color: white;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      display: inline-block;
    }

    /* FAQ 手风琴效果模拟 */
    .faq-item {
      border-left: 4px solid var(--data-cyan);
      background: var(--card-bg);
      border-radius: 0 var(--radius-card) var(--radius-card) 0;
      margin-bottom: 1rem;
      transition: 0.2s;
    }
    .faq-item:hover {
      border-left-color: var(--accent-pink);
      background: #22242E;
    }
    .faq-question {
      font-weight: 700;
      color: white;
      cursor: pointer;
      padding: 1.2rem;
    }
    .faq-answer {
      color: var(--text-body);
      padding: 0 1.2rem 1.2rem;
      display: block;
    }

    /* 表单 */
    .input-field {
      background: #0A0B10;
      border: none;
      border-bottom: 2px solid var(--data-cyan);
      padding: 0.9rem 0.5rem;
      width: 100%;
      color: white;
      outline: none;
      transition: border 0.2s;
      font-size: 1rem;
    }
    .input-field:focus {
      border-bottom-color: var(--accent-pink);
      box-shadow: 0 4px 12px rgba(229, 0, 126, 0.2);
    }

    /* 背景图区域 */
    .hero-bg {
      background: linear-gradient(135deg, rgba(10,11,16,0.7) 0%, rgba(10,11,16,0.85) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }
    .data-bg {
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      background-attachment: fixed;
    }

    /* 动画 */
    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(20px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    .animate-fadeup {
      animation: fadeUp 0.7s ease forwards;
    }

    /* 移动端调整 */
    @media (max-width: 768px) {
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }
      .mobile-stack {
        flex-direction: column;
        align-items: flex-start;
        gap: 2rem;
      }
      .grid-cols-2-mob {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }