/* roulang page: index */
:root {
      --primary: #C41E3A;
      --primary-hover: #A01830;
      --accent: #00E5FF;
      --accent-glow: rgba(0, 229, 255, 0.25);
      --dark-bg: #0B0E14;
      --darker-bg: #080A0F;
      --section-alt: #131820;
      --card-bg: #1A1F2B;
      --card-border: rgba(255, 255, 255, 0.06);
      --text-primary: #F0F2F5;
      --text-secondary: #B0B8C5;
      --text-muted: #6B7280;
      --white: #ffffff;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.5);
      --shadow-elevated: 0 16px 32px rgba(0, 0, 0, 0.6);
      --transition: 0.25s ease;
      --container-max: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: 'Inter', 'PingFang SC', 'MiSans', 'Helvetica Neue', system-ui, sans-serif;
      background-color: var(--dark-bg);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    /* 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, 229, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      display: flex;
      align-items: center;
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .navbar.scrolled {
      background: rgba(11, 14, 20, 0.92);
      backdrop-filter: saturate(180%) blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
      z-index: 10;
    }
    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(to right, #fff, #ddd);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--white);
    }

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background var(--transition);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 14, 20, 0.96);
      backdrop-filter: blur(18px);
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 8px 16px;
      justify-content: space-around;
      align-items: center;
      z-index: 999;
      height: 68px;
    }
    .mobile-bottom-nav a {
      color: var(--text-muted);
      text-decoration: none;
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      gap: 4px;
    }
    .mobile-bottom-nav a i {
      font-size: 1.3rem;
    }
    .mobile-bottom-nav .center-cta {
      background: var(--primary);
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.3rem;
      margin-top: -20px;
      box-shadow: 0 8px 18px rgba(196,30,58,0.5);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-color: #0B0E14;
    }
    .hero::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(11,14,20,0.4) 0%, #0B0E14 100%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: #d1d5db;
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: background var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: 0.25s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
    }
    .glass-panel {
      background: rgba(26, 31, 43, 0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-lg);
      padding: 28px;
      flex: 1 1 320px;
    }
    .metric-large {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
      font-family: 'Inter', sans-serif;
    }

    section {
      padding: 100px 0;
      position: relative;
      z-index: 1;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 48px;
      padding-left: 18px;
      border-left: 4px solid var(--primary);
      letter-spacing: -0.3px;
    }

    /* 数据看板 */
    .dashboard-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      background: #0f131a;
      border-radius: var(--radius-lg);
      padding: 32px;
      justify-content: space-around;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* 服务矩阵 2x3 不对称 */
    .service-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .service-grid .row-two {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: all var(--transition);
      cursor: default;
    }
    .service-card:hover {
      border-color: rgba(0,229,255,0.3);
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 20px;
    }

    /* 对比条 */
    .compare-row {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      background: #131820;
      padding: 32px;
      border-radius: var(--radius-md);
    }
    .progress-bar {
      height: 8px;
      background: #2a2f3a;
      border-radius: 4px;
      margin: 12px 0;
    }
    .progress-fill {
      height: 100%;
      background: var(--primary);
      width: 0%;
      border-radius: 4px;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .faq-question {
      padding: 18px 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      background: #10151D;
      padding: 0 16px;
      border-left: 2px solid var(--primary);
    }

    .contact-form input, .contact-form select {
      background: #1e2532;
      border: 1px solid #2d3543;
      color: white;
      padding: 14px;
      border-radius: var(--radius-sm);
      width: 100%;
      margin-bottom: 16px;
    }
    .footer {
      background: #080A0F;
      padding: 60px 0 20px;
    }

    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
      .service-grid .row-two {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .mobile-toggle { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero h1 { font-size: 2.4rem; }
      .dashboard-grid { flex-direction: column; }
      .service-grid .row-two { grid-template-columns: 1fr; }
    }