/* roulang page: index */
:root {
      --primary: #00E5FF;
      --primary-glow: rgba(0, 229, 255, 0.6);
      --secondary: #7B2FFF;
      --bg-deep: #0A0E27;
      --bg-card: rgba(10, 14, 39, 0.6);
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --text-main: #FFFFFF;
      --text-muted: #B0B8D0;
      --accent-green: #00E676;
      --accent-red: #FF5252;
      --radius-card: 20px;
      --radius-button: 30px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-mono: 'DIN Alternate', 'Roboto', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --container-max: 1200px;
      --nav-height: 72px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-muted);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    a:hover {
      color: var(--primary);
    }

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

    button, input, textarea {
      font-family: inherit;
      outline: none;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo-link {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-main);
      letter-spacing: 1px;
      flex-shrink: 0;
    }
    .logo-icon {
      height: 36px;
      width: auto;
    }

    .nav-menu {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      position: relative;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 0;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary-glow);
      transition: width 0.3s ease;
    }
    .nav-menu a:hover {
      color: var(--text-main);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }

    .mega-trigger {
      position: relative;
    }
    .mega-btn {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: var(--text-main);
      padding: 8px 20px;
      border-radius: 30px;
      cursor: pointer;
      font-weight: 500;
      transition: 0.25s;
      display: flex;
      align-items: center;
      gap: 6px;
      background: rgba(255,255,255,0.04);
    }
    .mega-btn:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: 0 0 16px rgba(0, 229, 255, 0.25);
    }
    .mega-panel {
      position: absolute;
      top: 48px;
      right: 0;
      width: 480px;
      background: rgba(10, 14, 39, 0.9);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 28px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: 0.3s ease;
      box-shadow: 0 20px 40px rgba(0,0,0,0.7);
      z-index: 99;
    }
    .mega-trigger:hover .mega-panel {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .mega-col h4 {
      color: var(--primary);
      font-size: 14px;
      margin-bottom: 16px;
      letter-spacing: 1px;
    }
    .mega-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .mega-col li a {
      color: var(--text-muted);
      font-size: 14px;
      transition: 0.2s;
    }
    .mega-col li a:hover {
      color: var(--primary);
    }
    .news-preview {
      display: flex;
      gap: 12px;
      align-items: center;
      margin-bottom: 16px;
    }
    .news-preview img {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      object-fit: cover;
      background: var(--glass-bg);
    }
    .news-preview span {
      font-size: 12px;
      color: var(--text-muted);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 4px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, #1a1f3a 0%, #0A0E27 70%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 60px;
    }
    .hero-bg-particles {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 600"><g fill="none" stroke="%2300E5FF" stroke-opacity="0.12" stroke-width="1.5"><path d="M0 300 Q200 100 400 300 T800 300"/><path d="M0 400 Q150 250 350 400 T800 400"/></g></svg>') repeat;
      animation: drift 20s linear infinite;
    }
    @keyframes drift {
      0% { transform: translate(0,0); }
      100% { transform: translate(-50px, 40px); }
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 44px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-main);
      margin-bottom: 20px;
      line-height: 1.3;
    }
    .hero-text p {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 560px;
      margin-bottom: 36px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF 0%, #7B2FFF 100%);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      letter-spacing: 0.5px;
      cursor: pointer;
      box-shadow: 0 0 24px rgba(0,229,255,0.5);
      transition: 0.3s;
      font-size: 16px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 36px rgba(0,229,255,0.8);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 500;
      cursor: pointer;
      transition: 0.3s;
    }
    .btn-ghost:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    .hero-dashboard {
      flex: 0 0 420px;
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(14px);
      border-radius: 28px;
      border: 1px solid rgba(255,255,255,0.1);
      overflow: hidden;
      box-shadow: 0 30px 50px rgba(0,0,0,0.6);
    }
    .hero-dashboard img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .section-title .decor {
      width: 4px;
      height: 32px;
      background: var(--primary);
      box-shadow: 0 0 18px var(--primary);
      border-radius: 2px;
    }

    /* 服务错落卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: 1fr 2fr 1fr;
      gap: 24px;
      margin-top: 48px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      transition: 0.3s;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--primary);
      box-shadow: 0 0 28px rgba(0,229,255,0.25);
    }
    .wide-card {
      grid-column: span 2;
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 24px;
    }
    .wide-card .card-left {
      flex: 1;
    }
    .wide-card .card-right img {
      width: 180px;
      border-radius: 16px;
      opacity: 0.9;
    }
    .service-icon {
      font-size: 36px;
      margin-bottom: 18px;
    }
    .service-card h3 {
      font-size: 22px;
      color: white;
      margin-bottom: 12px;
    }
    .gradient-bar {
      height: 4px;
      width: 48px;
      background: linear-gradient(90deg, #00E5FF, #7B2FFF);
      border-radius: 4px;
      margin-top: 20px;
    }

    /* 数据优势 */
    #advantages {
      background: #0d112b;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 44px;
      font-weight: 700;
      background: linear-gradient(135deg, #00E5FF, #7B2FFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .case-card {
      background: rgba(255,255,255,0.03);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.07);
      transition: 0.3s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.05);
    }
    .case-img {
      overflow: hidden;
      height: 180px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.4s;
    }
    .case-info {
      padding: 20px;
      color: white;
    }

    /* 解决方案步骤 */
    .steps-container {
      display: flex;
      gap: 24px;
      margin-top: 48px;
      position: relative;
    }
    .step-line {
      position: absolute;
      left: 23px;
      top: 20px;
      bottom: 20px;
      width: 2px;
      background: rgba(255,255,255,0.2);
    }
    .step-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 28px;
      flex: 1;
      position: relative;
      border: 1px solid rgba(255,255,255,0.08);
      display: flex;
      gap: 18px;
    }
    .step-dot {
      width: 12px;
      height: 12px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 18px var(--primary);
      margin-top: 6px;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-radius: 14px;
      margin-bottom: 12px;
      border: 1px solid rgba(255,255,255,0.05);
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 联系表单 */
    .contact-form input, .contact-form textarea {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 14px;
      padding: 14px;
      color: white;
      margin-bottom: 16px;
    }
    .contact-form input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 14px var(--primary-glow);
    }

    /* Footer */
    .site-footer {
      background: #050811;
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: 1fr; }
      .wide-card { grid-column: span 1; flex-direction: column; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu, .mega-trigger { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
      .hero-dashboard { flex: 0 0 auto; width: 100%; }
      .cases-grid { grid-template-columns: 1fr; }
    }