/* roulang page: index */
:root {
      --primary: #6C5CE7;
      --primary-glow: #7D6FF0;
      --accent-cyan: #00F5FF;
      --accent-amber: #FF6B35;
      --bg-deep: #0A0E1A;
      --bg-card: rgba(255, 255, 255, 0.03);
      --bg-section: #111827;
      --text-primary: #E8ECF1;
      --text-secondary: #9BA3B5;
      --border-subtle: rgba(255, 255, 255, 0.06);
      --border-active: rgba(0, 245, 255, 0.5);
      --success: #00E676;
      --danger: #FF5252;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-btn: 12px;
      --font-mono: 'SF Mono', 'JetBrains Mono', 'Consolas', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --transition: 0.3s ease;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-blur: blur(20px);
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    /* Container */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* Base link & button reset */
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input {
      font-family: inherit;
      outline: none;
      border: none;
    }
    img {
      max-width: 100%;
      display: block;
    }
    
    /* Navbar */
    #navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 26, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(108, 92, 231, 0.3);
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo i {
      font-size: 1.8rem;
      background: none;
      -webkit-text-fill-color: var(--accent-cyan);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s ease;
    }
    .nav-menu a:hover {
      color: #fff;
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      color: white !important;
      font-weight: 600;
      box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
    }
    .nav-cta:hover {
      background: var(--primary-glow);
      box-shadow: 0 0 25px var(--primary);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-primary);
      cursor: pointer;
    }
    
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: radial-gradient(circle at 30% 40%, rgba(108,92,231,0.15) 0%, transparent 50%), 
                        url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-title span {
      background: linear-gradient(to right, #fff, var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 25px rgba(108,92,231,0.5);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--primary-glow);
      box-shadow: 0 0 40px var(--accent-cyan);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--text-primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      border-color: var(--accent-cyan);
      color: #fff;
    }
    .dashboard-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .metric-row {
      display: flex;
      justify-content: space-between;
      margin-bottom: 24px;
    }
    .metric {
      text-align: center;
    }
    .metric-value {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-cyan);
      animation: pulse 2s infinite;
    }
    @keyframes pulse { 0% { opacity: 0.9; } 50% { opacity: 1; text-shadow: 0 0 10px var(--accent-cyan); } 100% { opacity: 0.9; } }
    .metric-label {
      color: var(--text-secondary);
      font-size: 0.85rem;
    }
    
    /* Section titles */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 3px;
      background: linear-gradient(to right, var(--primary), var(--accent-cyan));
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 3rem;
    }
    
    /* Glass cards */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
    }
    .glass-card:hover {
      border-color: var(--border-active);
      box-shadow: 0 0 30px rgba(0,245,255,0.15);
      transform: translateY(-4px);
    }
    
    /* Advantages numbers */
    .adv-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    
    /* Service grid */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    /* Comparison */
    .compare-box {
      background: #111827;
      border-radius: var(--radius-lg);
      padding: 40px;
    }
    
    /* Process steps */
    .process-steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
    }
    
    /* FAQ */
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* CTA form */
    .cta-input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 10px;
      padding: 14px 20px;
      color: white;
      width: 100%;
      transition: var(--transition);
    }
    .cta-input:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 15px rgba(0,245,255,0.2);
    }
    .btn-amber {
      background: var(--accent-amber);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 30px rgba(255,107,53,0.4);
      transition: var(--transition);
    }
    .btn-amber:hover {
      box-shadow: 0 0 50px rgba(255,107,53,0.7);
    }
    
    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 1023px) {
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 767px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .service-grid { grid-template-columns: 1fr; }
      .hero-title { font-size: 2rem; }
      .process-steps { flex-wrap: wrap; gap: 20px; }
      .footer-grid { grid-template-columns: 1fr; }
    }