/* roulang page: index */
/* 全局设计变量与重置 */
    :root {
      --bg-deep: #0A0E1A;
      --bg-card-glass: rgba(255, 255, 255, 0.03);
      --border-glass: rgba(255, 255, 255, 0.08);
      --glow-cyan: #00E5FF;
      --glow-amber: #FFB800;
      --text-primary: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #7B8FA1;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 12px;
      --shadow-card: 0 8px 32px rgba(0, 229, 255, 0.08);
      --transition-smooth: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    h1, h2, h3, h4 {
      color: var(--text-primary);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 玻璃拟态卡片基础 */
    .glass-card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-card);
    }
    /* 导航样式 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 26, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      align-items: center;
      z-index: 1000;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--glow-cyan);
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }
    .logo i {
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a:hover {
      color: #FFFFFF;
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 6px;
      height: 6px;
      background: var(--glow-cyan);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--glow-cyan);
    }
    .cta-btn {
      background: linear-gradient(135deg, #00E5FF, #0077FF);
      border: none;
      padding: 0.6rem 1.5rem;
      border-radius: 20px;
      font-weight: 600;
      color: #fff;
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.5);
      transition: all 0.3s;
      cursor: pointer;
    }
    .cta-btn:hover {
      box-shadow: 0 0 35px rgba(0, 229, 255, 0.8);
      transform: scale(1.05);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
    }
    /* 移动端导航面板 */
    .mobile-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 26, 0.95);
      backdrop-filter: blur(25px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }
    .mobile-panel.open {
      transform: translateY(0);
    }
    .mobile-panel a {
      font-size: 1.5rem;
      color: var(--text-primary);
    }
    /* Hero区域 */
    .hero {
      height: 100vh;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,14,26,0.85) 0%, rgba(0,119,255,0.3) 100%);
    }
    .hero-content {
      position: relative;
      max-width: 700px;
      padding-top: 10vh;
      margin-left: 0;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      text-shadow: 0 0 20px rgba(0,229,255,0.3);
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0C4DE;
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary-glow {
      background: linear-gradient(135deg, #00E5FF, #0077FF);
      padding: 0.8rem 2rem;
      border-radius: 30px;
      color: #fff;
      font-weight: bold;
      box-shadow: 0 0 25px rgba(0,229,255,0.6);
      border: none;
      cursor: pointer;
    }
    .btn-outline-glass {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      backdrop-filter: blur(8px);
      padding: 0.8rem 2rem;
      border-radius: 30px;
      color: #fff;
    }
    .float-stats {
      position: absolute;
      right: 2rem;
      bottom: 4rem;
      display: flex;
      gap: 1.5rem;
    }
    .stat-mini {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      padding: 1rem 1.5rem;
      border-radius: 14px;
      border: 1px solid rgba(255,255,255,0.1);
      color: #fff;
    }
    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
      margin: 4rem 0;
    }
    .metric-card {
      padding: 2rem;
      position: relative;
      overflow: hidden;
    }
    .metric-number {
      font-family: 'Inter', monospace;
      font-size: 3rem;
      font-weight: 700;
      color: var(--glow-amber);
    }
    .shimmer::after {
      content: '';
      position: absolute;
      top: 0;
      left: -50%;
      width: 60%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(0,229,255,0.12), transparent);
      transform: skewX(-20deg);
      animation: shimmer 3s infinite;
    }
    @keyframes shimmer {
      0% { left: -60%; }
      100% { left: 120%; }
    }
    /* 服务卡片网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin: 3rem 0;
    }
    .service-card {
      transition: all 0.25s;
      cursor: default;
    }
    .service-card:hover {
      transform: translateY(-8px);
      border-color: rgba(0,229,255,0.3);
      box-shadow: 0 12px 30px rgba(0,229,255,0.2);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      border-radius: 16px 16px 0 0;
    }
    /* 对比组件 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 2rem;
      margin: 4rem 0;
    }
    .compare-card {
      flex: 1;
      padding: 2rem;
    }
    .vs-badge {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      padding: 0.6rem 1.8rem;
      border-radius: 40px;
      font-weight: bold;
      color: var(--glow-cyan);
    }
    /* FAQ */
    .faq-item {
      margin-bottom: 1rem;
    }
    .faq-question {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      padding: 1.2rem 1.8rem;
      border-radius: 12px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border: 1px solid rgba(255,255,255,0.05);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      background: rgba(0,0,0,0.2);
      border-radius: 0 0 12px 12px;
    }
    /* 表单 */
    .contact-form {
      max-width: 640px;
      margin: 0 auto;
      padding: 3rem;
    }
    .input-style {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 1rem;
      color: #fff;
      width: 100%;
      margin-bottom: 1.2rem;
    }
    /* 页脚 */
    .footer {
      background: #060A14;
      padding: 4rem 0 1.5rem;
      margin-top: 4rem;
    }
    @media (max-width: 1024px) {
      .metrics-grid, .services-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-wrapper { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .container { padding: 0 1.5rem; }
      .hero h1 { font-size: 2.2rem; }
      .metrics-grid, .services-grid { grid-template-columns: 1fr; }
      .float-stats { position: static; justify-content: center; margin-top: 2rem; }
      .hero-content { padding-top: 6rem; }
    }