/* roulang page: index */
:root {
      --neon-cyan: #00F0FF;
      --deep-purple: #7B2FFF;
      --electric-gold: #FFD700;
      --bg-deep: #0D0D0D;
      --bg-card: #1A1A2E;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0C0;
      --text-muted: #666666;
      --border-dim: rgba(0, 240, 255, 0.15);
      --border-glow: rgba(0, 240, 255, 0.5);
      --shadow-card: 0 4px 20px rgba(0, 240, 255, 0.08);
      --shadow-hover: 0 12px 32px rgba(0, 240, 255, 0.2);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-fast: 0.2s ease;
      --container-max: 1200px;
      --header-height: 70px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background: radial-gradient(circle at 20% 10%, #1A1A2E, #0D0D0D 80%);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(13, 13, 13, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.18);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: white;
    }
    .logo-icon {
      font-size: 32px;
      filter: drop-shadow(0 0 8px var(--neon-cyan));
    }
    .logo-text {
      font-weight: 700;
      font-size: 20px;
      letter-spacing: 2px;
      background: linear-gradient(135deg, var(--neon-cyan), var(--deep-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--neon-cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-gold);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-nav:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.5);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--neon-cyan);
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: rgba(10, 10, 18, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        transform: translateY(-150%);
        transition: transform 0.35s ease;
        border-bottom: 1px solid var(--neon-cyan);
      }
      .nav-links.open {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }
    h2 {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      letter-spacing: 1px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 0;
      padding-top: var(--header-height);
    }
    .hero::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.1) 0%, rgba(13,13,13,0.8) 80%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero .highlight {
      color: var(--neon-cyan);
    }
    .hero p {
      font-size: 1.3rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--electric-gold);
      color: #0D0D0D;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: 0.25s;
      text-decoration: none;
      box-shadow: 0 0 15px rgba(255,215,0,0.4);
    }
    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(255,215,0,0.9);
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
    }
    .float-stats {
      display: flex;
      gap: 30px;
      margin-top: 40px;
      background: rgba(26,26,46,0.8);
      backdrop-filter: blur(8px);
      padding: 20px 30px;
      border-radius: 16px;
      border-left: 4px solid var(--neon-cyan);
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: 'DIN', 'Roboto Mono', monospace;
      font-size: 2rem;
      font-weight: 700;
      color: var(--electric-gold);
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(26, 26, 46, 0.7);
      backdrop-filter: blur(5px);
      padding: 28px 20px;
      border-radius: var(--radius-card);
      border-left: 4px solid var(--neon-cyan);
      transition: 0.3s;
    }
    .stat-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .stat-big {
      font-family: 'Roboto Mono', monospace;
      font-size: 2.8rem;
      font-weight: 700;
      color: white;
    }
    /* 服务非对称布局 */
    .services-layout {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      align-items: stretch;
    }
    .service-main {
      flex: 2;
      background: rgba(26,26,46,0.8);
      border: 1px solid var(--border-glow);
      border-radius: 20px;
      padding: 40px;
      position: relative;
    }
    .service-side {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .service-card {
      background: rgba(26,26,46,0.7);
      border: 1px solid var(--border-dim);
      border-radius: 16px;
      padding: 28px;
      transition: all 0.25s;
    }
    .service-card:hover {
      border-color: var(--neon-cyan);
      box-shadow: 0 8px 24px rgba(0,240,255,0.2);
    }
    .badge-hot {
      background: var(--electric-gold);
      color: black;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.8rem;
    }
    /* 结果对比 */
    .compare-panel {
      display: flex;
      gap: 40px;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
    }
    .vs-text {
      font-size: 4rem;
      font-weight: 900;
      color: var(--neon-cyan);
      animation: pulse 1.8s infinite;
    }
    .compare-box {
      flex: 1;
      min-width: 260px;
      background: #1A1A2E;
      padding: 30px;
      border-radius: 20px;
    }
    .compare-box.dim {
      opacity: 0.7;
      border: 1px solid #333;
    }
    .compare-box.glow {
      border: 1px solid var(--neon-cyan);
      box-shadow: 0 0 28px rgba(0,240,255,0.25);
    }
    .progress-bar {
      height: 8px;
      background: #333;
      border-radius: 10px;
      margin: 12px 0;
    }
    .progress-fill {
      height: 8px;
      background: var(--neon-cyan);
      border-radius: 10px;
      width: 0%;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: #ccc;
      padding-left: 28px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* 表单 */
    .contact-form input, .contact-form select, .contact-form textarea {
      background: #1A1A2E;
      border: 1px solid #333;
      padding: 14px;
      border-radius: 8px;
      color: white;
      width: 100%;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .contact-form input:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px var(--neon-cyan);
      outline: none;
    }
    @media (max-width: 768px) {
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .services-layout { flex-direction: column; }
      .compare-panel { flex-direction: column; }
    }
    @keyframes pulse { 0%{opacity:0.7;} 50%{opacity:1;} 100%{opacity:0.7;} }