/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --deep-black: #0A0F1D;
      --neon-cyan: #00E5A1;
      --energy-orange: #FF6B35;
      --bg-light: #F5F6FA;
      --white: #FFFFFF;
      --text-body: #4A4F5C;
      --text-muted: #7A808C;
      --text-light: #B0B8C5;
      --border-light: #E8EBF0;
      --card-shadow: 0 2px 16px rgba(10, 15, 29, 0.06);
      --card-hover-shadow: 0 8px 30px rgba(10, 15, 29, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition-smooth: all 0.25s ease;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 767px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 顶部信息条 */
    .top-bar {
      background: var(--deep-black);
      color: var(--text-light);
      font-size: 13px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
    }
    .top-bar .left span {
      margin-right: 12px;
    }
    .top-bar .right a {
      color: var(--neon-cyan);
      font-weight: 500;
      margin-left: 16px;
      transition: opacity 0.2s;
    }
    .top-bar .right a:hover {
      text-decoration: underline;
      opacity: 0.9;
    }
    @media (max-width: 767px) {
      .top-bar {
        padding: 0 16px;
        font-size: 12px;
      }
      .top-bar .left span:last-child {
        display: none;
      }
    }

    /* 主导航 */
    .main-nav {
      background: var(--white);
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
    }
    .logo {
      font-weight: 800;
      font-size: 22px;
      color: var(--deep-black);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo .brand-dot {
      width: 8px;
      height: 8px;
      background: var(--neon-cyan);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--deep-black);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--neon-cyan);
      color: var(--deep-black);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
    }
    .nav-cta:hover {
      background: #1AFFB8;
      box-shadow: 0 0 20px rgba(0, 229, 161, 0.3);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--deep-black);
    }
    @media (max-width: 991px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
    }
    @media (max-width: 767px) {
      .main-nav {
        padding: 0 20px;
      }
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      border-bottom: 1px solid var(--border-light);
      padding: 20px 32px;
      gap: 16px;
      box-shadow: var(--card-shadow);
      z-index: 40;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 0;
    }

    /* Hero */
    #hero {
      background: var(--deep-black);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      width: 100%;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }
    .hero-left h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -1px;
      color: white;
      margin-bottom: 24px;
    }
    .hero-left h1 .highlight {
      color: var(--neon-cyan);
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-light);
      margin-bottom: 40px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--neon-cyan);
      color: var(--deep-black);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-primary:hover {
      background: #1AFFB8;
      box-shadow: 0 0 20px rgba(0, 229, 161, 0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: white;
      color: var(--deep-black);
    }
    .hero-visual {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .data-card-preview {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(2px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-card);
      padding: 20px;
      color: white;
      font-family: 'JetBrains Mono', monospace;
    }
    .preview-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--neon-cyan);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.9; text-shadow: 0 0 2px var(--neon-cyan); }
      50% { opacity: 1; text-shadow: 0 0 12px var(--neon-cyan); }
      100% { opacity: 0.9; text-shadow: 0 0 2px var(--neon-cyan); }
    }
    .grid-bg {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    @media (max-width: 991px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: 1 1 auto;
        width: 100%;
      }
      .hero-left h1 {
        font-size: 40px;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
    }
    @media (max-width: 767px) {
      .hero-left h1 {
        font-size: 36px;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 767px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--deep-black);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--white);
      padding: 28px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      text-align: center;
      border-bottom: 3px solid var(--neon-cyan);
      transition: var(--transition-smooth);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .metric-number {
      font-family: 'JetBrains Mono', monospace;
      font-size: 36px;
      font-weight: 700;
      color: var(--neon-cyan);
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 8px;
    }
    @media (max-width: 991px) {
      .metrics-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }
    @media (max-width: 767px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 24px;
    }
    .service-main {
      background: var(--deep-black);
      color: white;
      border-radius: var(--radius-card);
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-main h3 {
      font-size: 28px;
      font-weight: 600;
      color: white;
    }
    .service-main p {
      color: var(--text-light);
      margin: 16px 0 24px;
    }
    .service-secondary {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .service-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .service-icon {
      color: var(--neon-cyan);
      font-size: 28px;
      margin-bottom: 16px;
    }
    @media (max-width: 991px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-box {
      padding: 40px;
      border-radius: var(--radius-card);
    }
    .compare-left {
      background: #F0F1F5;
      color: var(--text-muted);
    }
    .compare-right {
      background: #F5F6FA;
      border-left: 4px solid var(--neon-cyan);
    }
    .compare-list {
      list-style: none;
      margin-top: 20px;
    }
    .compare-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    @media (max-width: 767px) {
      .compare-container {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .faq-item {
      background: white;
      border-radius: 8px;
      padding: 20px;
      cursor: pointer;
      box-shadow: 0 1px 6px rgba(0,0,0,0.03);
      transition: all 0.25s;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
      margin-top: 12px;
    }
    @media (max-width: 767px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 表单 */
    .contact-form {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 32px;
    }
    .contact-form input {
      padding: 14px 16px;
      border-radius: var(--radius-input);
      border: 1px solid var(--border-light);
      font-size: 16px;
      background: white;
    }
    .contact-form input:focus {
      outline: none;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 0 3px rgba(0,229,161,0.2);
    }
    .btn-submit {
      background: var(--energy-orange);
      color: white;
      font-weight: 600;
      border: none;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: 0.2s;
      grid-column: span 1;
    }
    .btn-submit:hover {
      background: #E55A2B;
    }
    @media (max-width: 767px) {
      .contact-form {
        grid-template-columns: 1fr;
      }
    }

    /* 页脚 */
    .footer {
      background: var(--deep-black);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-logo {
      font-weight: 800;
      font-size: 20px;
      color: white;
    }
    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }