/* roulang page: index */
:root {
      --deep-black: #0A0E17;
      --electric-green: #00E5A0;
      --compete-red: #FF3C38;
      --card-bg: #141C26;
      --border-color: #1F2A36;
      --text-primary: #E0E6EF;
      --text-secondary: #8892A0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-card: 0 12px 24px rgba(0, 229, 160, 0.08);
      --transition-base: 0.3s ease;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      background-color: var(--deep-black);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 72px;
      background: rgba(10, 14, 23, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }
    .glass-nav.scrolled {
      background: rgba(10, 14, 23, 0.92);
      box-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      font-weight: 700;
      font-size: 24px;
      letter-spacing: -0.5px;
      color: #fff;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--electric-green);
      font-size: 28px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .nav-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--electric-green);
    }
    .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--electric-green);
      border-radius: 2px;
    }

    .btn-primary {
      background: var(--electric-green);
      color: var(--deep-black);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      border: none;
      cursor: pointer;
      font-size: 15px;
      transition: filter 0.2s, transform 0.1s;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }
    .btn-primary:active {
      transform: scale(0.97);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--electric-green);
      color: var(--electric-green);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 15px;
      transition: background 0.2s, color 0.2s;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: rgba(0, 229, 160, 0.1);
    }

    .mobile-nav {
      display: none;
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 首屏 Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, #0f1a24 0%, #0a0e17 70%);
      margin-top: 0;
      padding-top: 72px;
    }
    .hero-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      width: 100%;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1 1 50%;
      max-width: 600px;
    }
    .hero-right {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .hero-highlight {
      color: var(--electric-green);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .live-dashboard {
      background: rgba(20, 28, 38, 0.8);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 20px;
      min-width: 280px;
    }
    .metric-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .metric-value {
      font-weight: 700;
      font-size: 24px;
      color: var(--electric-green);
      font-feature-settings: "tnum";
    }

    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .section-desc {
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
      font-size: 17px;
    }

    /* 统计卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .stat-card:hover {
      border-color: var(--electric-green);
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
    }
    .stat-icon {
      font-size: 28px;
      color: var(--electric-green);
      margin-bottom: 16px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -1px;
      color: white;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 15px;
      margin-top: 8px;
    }

    /* 服务矩阵 - 不规则栅格 */
    .services-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .service-card.large {
      grid-row: span 2;
    }
    .service-card:hover {
      border-color: var(--electric-green);
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
    }
    .service-icon {
      font-size: 36px;
      color: var(--electric-green);
      margin-bottom: 20px;
    }
    .service-title {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 20px;
    }
    .tech-tag {
      display: inline-block;
      background: rgba(0, 229, 160, 0.1);
      color: var(--electric-green);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
      margin-right: 8px;
    }

    /* 对比区 */
    .comparison-container {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1 1 45%;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--border-color);
    }
    .compare-col.old {
      border-left: 4px solid var(--compete-red);
    }
    .compare-col.new {
      border-left: 4px solid var(--electric-green);
    }
    .compare-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .progress-bar {
      width: 100px;
      height: 6px;
      background: #2a3340;
      border-radius: 4px;
      overflow: hidden;
    }
    .progress-fill {
      height: 100%;
      background: var(--electric-green);
      width: 0%;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-color);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: white;
      font-size: 18px;
      font-weight: 500;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      font-size: 20px;
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单 */
    .contact-form {
      max-width: 480px;
      margin: 0 auto;
      background: rgba(20, 28, 38, 0.7);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 40px;
      border: 1px solid var(--border-color);
    }
    .input-field {
      width: 100%;
      background: #0A0E17;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: white;
      margin-bottom: 20px;
      font-size: 15px;
      transition: border 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--electric-green);
      box-shadow: 0 0 0 3px rgba(0,229,160,0.2);
    }
    .submit-btn {
      width: 100%;
      background: var(--electric-green);
      color: #0A0E17;
      font-weight: 700;
      padding: 14px;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
    }
    .submit-btn:hover {
      filter: brightness(1.1);
    }

    footer {
      background: #060A10;
      padding: 60px 0 30px;
      color: var(--text-secondary);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }
    .footer-links a {
      color: var(--text-secondary);
      text-decoration: none;
      margin-right: 24px;
      font-size: 14px;
    }
    .footer-links a:hover {
      color: var(--electric-green);
    }

    /* 移动端底部导航 */
    .bottom-mobile-nav {
      display: none;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero h1 { font-size: 40px; }
    }

    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .hamburger { display: flex; }
      .mobile-menu-panel {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10,14,23,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        z-index: 999;
      }
      .mobile-menu-panel.open { display: flex; }
      .bottom-mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(20,28,38,0.9);
        backdrop-filter: blur(12px);
        border-top: 1px solid #1F2A36;
        justify-content: space-around;
        align-items: center;
        padding: 10px 16px;
        z-index: 1000;
      }
      .bottom-nav-item {
        color: var(--text-secondary);
        text-decoration: none;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .bottom-nav-item.active {
        color: var(--electric-green);
      }
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        max-width: 100%;
      }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid {
        grid-template-columns: 1fr;
      }
      section { padding: 80px 0; }
    }
    @media (max-width: 480px) {
      .stats-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 32px; }
    }