/* roulang page: index */
:root {
      --bg-deep: #0B0F1E;
      --cyan: #00F0FF;
      --orange: #FF6A3D;
      --card-bg: rgba(18, 24, 40, 0.75);
      --card-border: rgba(0, 240, 255, 0.15);
      --white: #FFFFFF;
      --gray-blue: #B0C4DE;
      --muted: #6B7B8D;
      --radius-card: 16px;
      --radius-btn: 30px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --glow-cyan: 0 0 24px rgba(0,240,255,0.25);
      --glow-orange: 0 0 20px rgba(255,106,61,0.6);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: 'DIN Alternate', 'Roboto Mono', monospace;
      --max-width: 1200px;
      --section-gap: 120px;
      --card-padding: 28px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--gray-blue);
      line-height: 1.6;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 背景网格与粒子 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0,240,255,0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,240,255,0.06) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    /* 动态数据流线条动画 */
    .data-stream {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.03) 0%, transparent 50%),
                  radial-gradient(circle at 80% 70%, rgba(255,106,61,0.03) 0%, transparent 50%);
      pointer-events: none;
      z-index: 0;
      animation: pulseGlow 8s infinite alternate;
    }
    @keyframes pulseGlow {
      0% { opacity: 0.5; }
      100% { opacity: 1; }
    }

    main, header, footer, section {
      position: relative;
      z-index: 1;
    }

    /* 导航 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11,15,30,0.8);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.15);
      z-index: 1000;
      padding: 15px 0;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--cyan);
      text-decoration: none;
      letter-spacing: 1px;
    }
    .logo::before {
      content: "▲";
      font-size: 1.2rem;
      color: var(--cyan);
      transform: rotate(90deg);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: var(--gray-blue);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--cyan);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--cyan);
      transition: 0.2s;
    }

    /* 英雄区 */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 40px;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.08) 0%, transparent 40%),
                  radial-gradient(circle at 80% 70%, rgba(255,106,61,0.06) 0%, transparent 40%);
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 44px;
      font-weight: 700;
      color: var(--white);
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero-left .sub {
      font-size: 16px;
      color: var(--gray-blue);
      margin-bottom: 30px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--orange);
      color: white;
      border: none;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      cursor: pointer;
      box-shadow: var(--glow-orange);
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(255,106,61,0.9);
      transform: scale(1.04);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.08);
    }
    .hero-right {
      flex: 1;
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .stat-row {
      display: flex;
      justify-content: space-between;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--cyan);
    }
    .stat-number.orange {
      color: var(--orange);
    }
    .stat-label {
      font-size: 13px;
      color: var(--muted);
      margin-top: 5px;
    }

    /* 通用板块标题 */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--gray-blue);
      margin-bottom: 50px;
    }

    /* 数据看板 */
    .dashboard {
      padding: 0 0 var(--section-gap);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: rgba(18,24,40,0.6);
      border: 1px solid rgba(0,240,255,0.1);
      border-radius: var(--radius-card);
      padding: 24px;
      text-align: center;
      animation: borderPulse 3s infinite;
    }
    @keyframes borderPulse {
      0% { border-color: rgba(0,240,255,0.1); }
      50% { border-color: rgba(0,240,255,0.3); }
      100% { border-color: rgba(0,240,255,0.1); }
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--cyan);
    }
    .metric-number.highlight {
      color: var(--orange);
    }

    /* 服务卡片 */
    .services {
      padding: 0 0 var(--section-gap);
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      transition: 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      border-color: rgba(0,240,255,0.4);
      transform: translateY(-4px);
      box-shadow: var(--glow-cyan);
    }
    .card-icon {
      font-size: 2rem;
      color: var(--cyan);
      margin-bottom: 15px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--gray-blue);
      margin-bottom: 20px;
      flex: 1;
    }
    .card-btn {
      align-self: flex-start;
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: 0.2s;
      cursor: pointer;
      text-decoration: none;
    }
    .card-btn:hover {
      background: rgba(0,240,255,0.1);
    }

    /* 对比表 */
    .comparison {
      padding: 0 0 var(--section-gap);
    }
    .compare-container {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      display: flex;
      gap: 0;
    }
    .compare-col {
      flex: 1;
      padding: 20px;
    }
    .compare-col h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 24px;
    }
    .compare-col.left h3 {
      color: var(--muted);
    }
    .compare-col.right h3 {
      color: var(--cyan);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 15px;
    }
    .icon-check {
      color: var(--cyan);
    }
    .icon-cross {
      color: #6B7B8D;
    }
    .highlight-percent {
      color: var(--orange);
      font-weight: 700;
      margin-left: 6px;
    }

    /* 案例区域 */
    .cases {
      padding: 0 0 var(--section-gap);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .case-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-bottom: 1px solid var(--card-border);
    }
    .case-content {
      padding: 20px;
    }
    .case-content h4 {
      color: var(--white);
      margin-bottom: 8px;
    }

    /* FAQ */
    .faq {
      padding: 0 0 var(--section-gap);
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,240,255,0.15);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
      font-size: 16px;
      color: var(--white);
    }
    .faq-question span {
      color: var(--cyan);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--gray-blue);
      padding-left: 28px;
      font-size: 14px;
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
      padding-top: 12px;
    }

    /* 表单 */
    .contact {
      padding: 0 0 80px;
    }
    .form-card {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 40px;
      max-width: 700px;
      margin: 0 auto;
    }
    .form-card input, .form-card textarea {
      width: 100%;
      background: transparent;
      border: 1px solid rgba(0,240,255,0.2);
      padding: 14px;
      margin-bottom: 20px;
      border-radius: 12px;
      color: white;
      font-size: 15px;
      outline: none;
      transition: 0.2s;
    }
    .form-card input:focus, .form-card textarea:focus {
      border-color: var(--cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
    }

    /* 页脚 */
    .footer {
      border-top: 1px solid rgba(0,240,255,0.1);
      padding: 40px 0 20px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }
    .footer-col p {
      color: var(--muted);
    }
    .social-icons i {
      font-size: 1.4rem;
      color: var(--cyan);
      margin-right: 16px;
    }

    /* 响应式 */
    @media (max-width: 1023px) {
      .cards-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
      .hero { flex-direction: column; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 767px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-left h1 { font-size: 32px; }
      .cards-grid, .case-grid, .metrics-grid { grid-template-columns: 1fr; }
      .compare-container { flex-direction: column; }
      .stat-number { font-size: 2rem; }
    }