/* roulang page: index */
:root {
      --primary-dark: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-red: #FF3C38;
      --bg-white: #FFFFFF;
      --bg-light: #F5F6FA;
      --text-dark: #1A1A2E;
      --text-muted: #6B7280;
      --border: #E5E7EB;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 20px rgba(10,14,39,0.06);
      --shadow-cyan: 0 12px 32px rgba(0,240,255,0.12);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-mono: 'DIN Alternate', 'SF Mono', 'Menlo', monospace;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      color: var(--text-dark);
      background-color: var(--bg-white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-family: var(--font-title);
      font-weight: 700;
    }
    h1 {
      font-size: 56px;
      line-height: 1.1;
      font-weight: 800;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 40px;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
      line-height: 1.3;
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      border: none;
      background: transparent;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 20px 0;
      transition: background var(--transition), backdrop-filter var(--transition), padding var(--transition);
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(10,14,39,0.92);
      backdrop-filter: blur(16px);
      padding: 12px 0;
      box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-title);
      font-size: 28px;
      font-weight: 800;
      color: white;
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--accent-cyan);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 15px;
      position: relative;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width var(--transition);
    }
    .nav-menu a:hover {
      color: white;
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent-red);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      margin-left: 16px;
      transition: all var(--transition);
    }
    .nav-cta:hover {
      background: #D63031;
      transform: scale(1.05);
      box-shadow: 0 0 20px rgba(255,60,56,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: white;
      border-radius: 3px;
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10,14,39,0.98);
        backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 40px;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.4s;
        z-index: 999;
      }
      .mobile-menu.active {
        opacity: 1;
        visibility: visible;
      }
      .mobile-menu a {
        color: white;
        font-size: 24px;
        font-weight: 600;
      }
      .mobile-close {
        position: absolute;
        top: 40px;
        right: 30px;
        color: white;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #0A0E27 0%, #1A1A3E 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: white;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,240,255,0.15) 0%, transparent 70%);
      top: -200px;
      right: -100px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 60px;
      width: 100%;
    }
    .hero-left h1 {
      color: white;
      margin-bottom: 24px;
      animation: fadeInUp 0.9s ease;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 40px;
      max-width: 480px;
      animation: fadeInUp 1s ease;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-bottom: 40px;
      animation: fadeInUp 1.1s;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-cyan);
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .stat-label {
      font-size: 14px;
      color: rgba(255,255,255,0.6);
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-dark);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.7);
      transform: scale(1.03);
    }
    .btn-secondary {
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      background: transparent;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
    }
    .hero-right {
      display: flex;
      justify-content: center;
    }
    .hero-image {
      width: 100%;
      max-width: 500px;
      border-radius: 20px;
      box-shadow: 0 30px 50px rgba(0,0,0,0.5);
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }
    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-label {
      color: var(--accent-cyan);
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 2px;
      margin-bottom: 12px;
      font-size: 14px;
    }
    .bg-light {
      background: var(--bg-light);
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    .dash-card {
      background: rgba(10,14,39,0.05);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(0,240,255,0.15);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      text-align: center;
      transition: all 0.3s;
    }
    .dash-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--shadow-cyan);
      transform: translateY(-5px);
    }
    .dash-number {
      font-family: var(--font-mono);
      font-size: 44px;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 30px;
    }
    .service-card {
      background: white;
      padding: 40px 30px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .service-card:hover {
      box-shadow: var(--shadow-cyan);
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: #f0f9ff;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
    }
    /* 对比区 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .compare-card {
      background: white;
      padding: 40px;
      border-radius: var(--radius-card);
    }
    .compare-left {
      border: 1px solid var(--border);
      opacity: 0.9;
    }
    .compare-right {
      border: 2px solid var(--accent-cyan);
      background: #f6fdff;
      position: relative;
    }
    .compare-bar {
      display: flex;
      align-items: center;
      gap: 20px;
      margin: 24px 0;
    }
    .progress-bg {
      height: 8px;
      background: #eee;
      border-radius: 10px;
      flex: 1;
      transition: width 1s;
    }
    .progress-fill {
      height: 100%;
      background: var(--accent-cyan);
      border-radius: 10px;
      width: 98%;
      transition: width 0.6s;
    }
    /* 案例卡片 */
    .cases-scroll {
      display: flex;
      gap: 30px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 350px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      flex-shrink: 0;
      transition: transform 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-cyan);
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }
    /* CTA 区域 */
    .cta-dark {
      background: var(--primary-dark);
      color: white;
      text-align: center;
    }
    .form-row {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .form-input {
      padding: 14px 20px;
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-input);
      color: white;
      min-width: 200px;
      transition: border 0.3s;
    }
    .form-input:focus {
      border-color: var(--accent-cyan);
      outline: none;
    }
    .btn-cta {
      background: var(--accent-red);
      color: white;
      padding: 14px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
    }
    .btn-cta:hover {
      background: #D63031;
      box-shadow: 0 0 25px rgba(255,60,56,0.6);
    }
    footer {
      background: #0A0E27;
      color: rgba(255,255,255,0.7);
      padding: 40px 0;
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .hero-grid, .dashboard-grid, .compare-wrapper, .faq-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .case-card { min-width: 280px; }
      .hero-stats { flex-direction: column; gap: 20px; }
    }