/* roulang page: index */
:root {
      --bg-deep: #0A0E17;
      --bg-dark: #050A14;
      --cyan: #00F0FF;
      --purple: #B300FF;
      --text-primary: #FFFFFF;
      --text-secondary: #A0B0C0;
      --text-dim: #6A7785;
      --glass-bg: rgba(10, 14, 23, 0.6);
      --glass-border: rgba(0, 240, 255, 0.15);
      --card-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 0 1px rgba(0,240,255,0.1);
      --card-hover-shadow: 0 25px 50px rgba(0,0,0,0.8), 0 0 20px rgba(0,240,255,0.4);
      --radius-card: 16px;
      --radius-btn: 30px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      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-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 30% 20%, rgba(0,240,255,0.08) 0%, transparent 35%),
                        radial-gradient(circle at 80% 70%, rgba(179,0,255,0.07) 0%, transparent 40%),
                        linear-gradient(rgba(10,14,23,0.4) 1px, transparent 1px),
                        linear-gradient(90deg, rgba(10,14,23,0.4) 1px, transparent 1px);
      background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(5, 10, 20, 0.75);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      border-bottom: 1px solid rgba(0,240,255,0.2);
      z-index: 1000;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      letter-spacing: 1px;
      color: var(--text-primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      text-shadow: 0 0 15px rgba(0,240,255,0.5);
    }
    .logo i {
      color: var(--cyan);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan);
    }
    .nav-cta {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      border: none;
      color: #0A0E17;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 30px;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .nav-cta:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.7);
      transform: translateY(-2px);
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--cyan);
      font-size: 28px;
      cursor: pointer;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      min-height: 90vh;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 900;
      line-height: 1.2;
      color: #FFFFFF;
      text-shadow: 0 0 30px rgba(0,240,255,0.4);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      border: none;
      color: #0A0E17;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 30px;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition);
      display: inline-block;
      box-shadow: 0 10px 20px rgba(0,240,255,0.3);
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,240,255,0.8);
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: 30px;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      transform: translateY(-3px);
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
      position: relative;
    }
    .holo-card {
      width: 340px;
      height: 400px;
      background: rgba(10,14,23,0.5);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 32px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 60px rgba(0,240,255,0.2);
      animation: float 6s ease-in-out infinite;
      position: relative;
      overflow: hidden;
    }
    .holo-circle {
      width: 180px;
      height: 180px;
      border: 2px solid var(--cyan);
      border-radius: 50%;
      position: relative;
      animation: spin 10s linear infinite;
      box-shadow: 0 0 30px var(--cyan);
    }
    .holo-inner {
      position: absolute;
      top: 15px;
      left: 15px;
      right: 15px;
      bottom: 15px;
      border: 1px dashed var(--purple);
      border-radius: 50%;
      animation: spinReverse 8s linear infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }
    @keyframes spin {
      from { transform: rotate(0deg); }
      to { transform: rotate(360deg); }
    }
    @keyframes spinReverse {
      from { transform: rotate(0deg); }
      to { transform: rotate(-360deg); }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: #FFFFFF;
      text-align: center;
      margin-bottom: 16px;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 80px;
      height: 3px;
      background: var(--cyan);
      margin: 16px auto 0;
      box-shadow: 0 0 15px var(--cyan);
    }
    .section-desc {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
      font-size: 18px;
      color: var(--text-secondary);
    }
    /* 优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 40px 28px;
      transition: var(--transition);
      position: relative;
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--cyan);
    }
    .feature-card:hover {
      box-shadow: var(--card-hover-shadow);
      border-left-color: var(--purple);
      transform: translateY(-6px);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--cyan);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: #E0F0FF;
      margin-bottom: 14px;
    }
    /* 功能标签页 */
    .tabs-container {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-bottom: 48px;
    }
    .tab-btn {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      color: var(--text-secondary);
      padding: 12px 32px;
      border-radius: 30px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    .tab-btn.active {
      background: var(--cyan);
      color: #0A0E17;
      border-color: var(--cyan);
      box-shadow: 0 0 20px var(--cyan);
    }
    .tab-panel {
      display: none;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .tab-panel.active {
      display: grid;
    }
    .func-item {
      background: rgba(10,14,23,0.7);
      backdrop-filter: blur(12px);
      padding: 28px;
      border-radius: 16px;
      border: 1px solid rgba(0,240,255,0.1);
      color: #E0F0FF;
    }
    /* 实时数据仪表盘 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .data-card {
      background: rgba(5,10,20,0.8);
      backdrop-filter: blur(15px);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 20px;
      padding: 28px 20px;
      text-align: center;
      color: white;
    }
    .data-number {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--cyan);
      text-shadow: 0 0 15px var(--cyan);
    }
    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 28px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 320px;
      background: rgba(10,14,23,0.7);
      backdrop-filter: blur(15px);
      border-radius: 24px;
      padding: 28px;
      border: 1px solid rgba(0,240,255,0.2);
      scroll-snap-align: start;
      position: relative;
    }
    .case-card img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      border-radius: 16px;
      margin-bottom: 16px;
      opacity: 0.8;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: rgba(10,14,23,0.5);
      backdrop-filter: blur(15px);
      border-radius: 16px;
      border: 1px solid rgba(0,240,255,0.1);
    }
    .faq-question {
      padding: 24px;
      font-weight: 600;
      color: white;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: rgba(0,0,0,0.3);
      padding: 0 24px;
    }
    .faq-item.open .faq-answer {
      max-height: 160px;
      padding: 0 24px 20px;
    }
    /* CTA */
    .cta-section {
      background: radial-gradient(circle at center, rgba(0,240,255,0.1) 0%, transparent 70%);
    }
    /* 页脚 */
    .footer {
      background: #050A14;
      border-top: 1px solid rgba(0,240,255,0.2);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: var(--text-secondary);
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--cyan);
    }
    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 { font-size: 42px; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .dashboard-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero h1 { font-size: 36px; }
      .features-grid, .faq-grid, .footer-grid { grid-template-columns: 1fr; }
      .tab-panel.active { grid-template-columns: 1fr; }
      .dashboard-grid { grid-template-columns: 1fr; }
      .container { padding: 0 20px; }
    }