/* roulang page: index */
:root {
      --deep-space: #0A0F1E;
      --competition-red: #E8384F;
      --electric-cyan: #00F0FF;
      --light-gray: #F5F5F7;
      --dark-blue: #1A1F2E;
      --success-green: #00D68F;
      --white: #FFFFFF;
      --text-primary: #0A0F1E;
      --text-secondary: #6B7280;
      --border-radius-card: 16px;
      --border-radius-btn: 40px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.15);
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --container-max: 1280px;
    }

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

    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--deep-space);
      color: var(--white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

    /* 浮动导航 Dock */
    .nav-dock {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 95%;
      background: rgba(10, 15, 30, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 40px;
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 32px;
      z-index: 1000;
      box-shadow: 0 8px 24px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.08);
    }

    .logo {
      font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 2px;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
      white-space: nowrap;
    }

    .logo-icon {
      color: var(--electric-cyan);
      font-size: 2rem;
      filter: drop-shadow(0 0 6px var(--electric-cyan));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      letter-spacing: 0.5px;
    }

    .nav-links a:hover {
      color: var(--electric-cyan);
    }

    .btn-primary {
      background: var(--competition-red);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      text-decoration: none;
      display: inline-block;
      white-space: nowrap;
      box-shadow: 0 0 12px rgba(232,56,79,0.4);
      animation: pulse-btn 2s infinite;
    }

    .btn-primary:hover {
      background: #FF4D5A;
      transform: scale(1.03);
      box-shadow: 0 0 20px rgba(232,56,79,0.7);
    }

    @keyframes pulse-btn {
      0% { box-shadow: 0 0 8px rgba(232,56,79,0.4); }
      50% { box-shadow: 0 0 20px rgba(232,56,79,0.8); }
      100% { box-shadow: 0 0 8px rgba(232,56,79,0.4); }
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--electric-cyan);
      color: var(--electric-cyan);
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }

    .mobile-menu-icon {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* Hero Section */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, #1A1F2E 0%, #0A0F1E 80%);
      overflow: hidden;
      padding: 120px 0 80px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-title {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
      color: white;
    }

    .hero-highlight {
      color: var(--electric-cyan);
      text-shadow: 0 0 15px rgba(0,240,255,0.5);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 32px;
    }

    .stat-item {
      background: rgba(26,31,46,0.7);
      backdrop-filter: blur(8px);
      padding: 16px 24px;
      border-radius: 16px;
      border-left: 3px solid var(--electric-cyan);
    }

    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--electric-cyan);
    }

    .hero-image-card {
      background: rgba(26,31,46,0.5);
      border-radius: 24px;
      padding: 20px;
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* Metrics 数据看板 */
    .metrics {
      padding: 100px 0;
      background: var(--deep-space);
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.2;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .metric-card {
      background: var(--dark-blue);
      border-radius: var(--border-radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }

    .metric-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--electric-cyan);
    }

    .metric-icon {
      font-size: 2.2rem;
      color: var(--electric-cyan);
      margin-bottom: 16px;
    }

    .metric-value {
      font-size: 2.4rem;
      font-weight: 700;
      color: white;
    }

    /* 服务矩阵 非对称 */
    .services {
      padding: 100px 0;
      background: #0A0F1E;
    }

    .service-row {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }

    .service-row.reverse {
      grid-template-columns: 7fr 5fr;
    }

    .service-img {
      background: #1A1F2E;
      border-radius: 16px;
      height: 340px;
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }

    .service-img::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(232,56,79,0.2) 0%, transparent 70%);
    }

    .service-content h3 {
      font-size: 28px;
      margin-bottom: 16px;
    }

    .feature-list {
      list-style: none;
      margin-top: 20px;
    }

    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .feature-list li::before {
      content: "●";
      color: var(--electric-cyan);
      font-size: 1.2rem;
    }

    /* 对比表 */
    .contrast {
      padding: 100px 0;
      background: #0A0F1E;
    }

    .contrast-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }

    .contrast-col {
      background: #1A1F2E;
      border-radius: 24px;
      padding: 40px;
    }

    .contrast-col.winner {
      border: 2px solid var(--electric-cyan);
      box-shadow: 0 0 24px rgba(0,240,255,0.2);
    }

    .contrast-item {
      display: flex;
      justify-content: space-between;
      padding: 16px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* FAQ */
    .faq {
      padding: 100px 0;
      background: #0A0F1E;
    }

    .faq-item {
      background: #1A1F2E;
      border-radius: 16px;
      margin-bottom: 16px;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }

    .faq-item.active {
      border-left: 3px solid var(--electric-cyan);
    }

    .faq-question {
      padding: 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      padding: 0 24px 24px;
      display: none;
      color: rgba(255,255,255,0.8);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 联系表单 */
    .contact {
      padding: 100px 0;
      background: #0A0F1E;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      margin-top: 40px;
    }

    .contact-form input, .contact-form textarea {
      width: 100%;
      background: rgba(26,31,46,0.8);
      border: 1px solid #2D3748;
      border-radius: 12px;
      padding: 14px;
      color: white;
      margin-bottom: 16px;
      transition: 0.2s;
    }

    .contact-form input:focus {
      border-color: var(--electric-cyan);
      outline: none;
    }

    .footer {
      background: #050812;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .service-row, .service-row.reverse, .contact-grid {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-dock {
        top: auto;
        bottom: 16px;
        width: 95%;
        border-radius: 32px;
        padding: 8px 16px;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-icon {
        display: block;
      }
      .hero-title {
        font-size: 36px;
      }
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .contrast-table {
        grid-template-columns: 1fr;
      }
    }