/* roulang page: index */
:root {
      --primary-bg: #0A0E27;
      --secondary-bg: #1A1F3A;
      --accent-blue: #00D2FF;
      --accent-orange: #FF6B35;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #7A8BA0;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-blue: 0 0 20px rgba(0, 210, 255, 0.6);
      --radius-card: 20px;
      --radius-button: 30px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-body);
      background: linear-gradient(145deg, #0A0E27 0%, #1A1F3A 100%);
      color: var(--text-primary);
      line-height: 1.7;
      overflow-x: hidden;
      position: relative;
      min-height: 100vh;
    }

    /* 背景网格装饰 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 210, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 210, 255, 0.04) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
      opacity: 0.4;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      z-index: 100;
      display: flex;
      align-items: center;
      transition: all 0.3s ease;
      background: transparent;
    }

    .navbar.scrolled {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 4px 25px rgba(0,0,0,0.5);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: #fff;
      text-decoration: none;
      letter-spacing: 2px;
      z-index: 101;
    }

    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, #00D2FF, #FF6B35);
      border-radius: 8px 2px 8px 2px;
      transform: rotate(0deg);
      box-shadow: 0 0 15px rgba(0,210,255,0.7);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: #E0E8F0;
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--accent-blue);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-blue);
      box-shadow: 0 0 10px var(--accent-blue);
      transition: width 0.3s;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-cta-nav {
      background: linear-gradient(135deg, #00D2FF, #007BFF);
      border: none;
      color: white;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 0 18px rgba(0,210,255,0.6);
      transition: all 0.3s;
      text-decoration: none;
      font-size: 0.95rem;
      display: inline-block;
    }

    .btn-cta-nav:hover {
      box-shadow: 0 0 28px rgba(0,210,255,0.9);
      transform: scale(1.04);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 102;
    }

    .hamburger span {
      width: 26px;
      height: 3px;
      background: white;
      border-radius: 3px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(8, 12, 30, 0.96);
        backdrop-filter: blur(25px);
        z-index: 99;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
      }
      .mobile-menu.active {
        transform: translateX(0);
      }
      .mobile-menu a {
        font-size: 1.5rem;
        color: white;
        text-decoration: none;
        font-weight: 600;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: 72px;
      overflow: hidden;
      background: radial-gradient(circle at 80% 40%, rgba(0,210,255,0.15) 0%, transparent 40%);
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 40px;
    }

    .hero-text {
      flex: 1;
    }

    .hero h1 {
      font-family: var(--font-heading);
      font-size: clamp(2.4rem, 6vw, 3.8rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
      text-shadow: 0 0 20px rgba(0,210,255,0.3);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #B0C4DE;
      margin-bottom: 40px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00D2FF, #007BFF);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      box-shadow: 0 0 22px rgba(0,210,255,0.65);
      transition: 0.3s;
      text-decoration: none;
    }

    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,210,255,0.9);
      transform: scale(1.03);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--accent-blue);
      color: var(--accent-blue);
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
    }

    .btn-secondary:hover {
      background: rgba(0,210,255,0.08);
    }

    .hero-image {
      flex: 0.9;
      display: flex;
      justify-content: flex-end;
    }

    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 28px;
      box-shadow: 0 20px 50px rgba(0,0,0,0.7);
      border: 1px solid rgba(255,255,255,0.1);
    }

    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-image {
        justify-content: center;
        margin-top: 30px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    section {
      padding: 100px 0;
    }

    h2 {
      font-family: var(--font-heading);
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
      color: white;
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      text-align: center;
      transition: 0.3s;
    }

    .stat-card:hover {
      border-color: var(--accent-blue);
      box-shadow: 0 0 22px rgba(0,210,255,0.5);
      transform: translateY(-4px);
    }

    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      font-family: 'Inter', sans-serif;
    }

    .stat-label {
      color: #B0C4DE;
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .dashboard-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* 服务矩阵 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
    }

    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: 0.3s;
    }

    .service-card:hover {
      border-color: var(--accent-blue);
      box-shadow: 0 0 22px rgba(0,210,255,0.5);
      transform: translateY(-5px);
    }

    .service-card.large {
      grid-row: span 2;
    }

    .service-icon {
      font-size: 2rem;
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .service-card.large {
        grid-row: auto;
      }
    }

    /* 对比 */
    .compare-container {
      display: flex;
      align-items: center;
      gap: 30px;
    }

    .compare-card {
      flex: 1;
      padding: 32px;
      border-radius: 24px;
    }

    .compare-left {
      background: rgba(255,255,255,0.02);
      color: #aaa;
    }

    .compare-right {
      background: rgba(0,210,255,0.08);
      border: 1px solid var(--accent-blue);
      box-shadow: 0 0 25px rgba(0,210,255,0.25);
      color: white;
    }

    .vs-badge {
      font-weight: 700;
      font-size: 1.8rem;
      background: linear-gradient(135deg, #00D2FF, #FF6B35);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    @media (max-width: 768px) {
      .compare-container {
        flex-direction: column;
      }
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(15px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 16px;
      margin-bottom: 16px;
      padding: 18px 24px;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #B0C4DE;
    }

    /* 表单 */
    .contact-row {
      display: flex;
      gap: 48px;
      align-items: center;
    }

    .contact-form input, .contact-form textarea {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 14px;
      color: white;
      margin-bottom: 20px;
      transition: 0.2s;
    }

    .contact-form input:focus {
      border-color: var(--accent-blue);
      box-shadow: 0 0 12px var(--accent-blue);
      outline: none;
    }

    @media (max-width: 768px) {
      .contact-row {
        flex-direction: column;
      }
    }

    footer {
      background: #05081C;
      padding: 60px 0 30px;
      color: #9AA9B9;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }