:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary: #10b981;
            --secondary-dark: #0d9668;
            --accent: #f59e0b;
            --dark: #1e293b;
            --darker: #0f172a;
            --light: #f8fafc;
            --gray: #64748b;
            --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            --gradient-dark: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
        }

    body {
      background: var(--light);
      font-family: "Segoe UI", Roboto, sans-serif;
      color: var(--dark);
      line-height: 1.8;
      padding-top: 4rem;
    }

    .container {
      max-width: 950px;
    }

    .card {
      border-radius: 16px;
      border: none;
      background: white;
      box-shadow: 0 6px 20px rgba(0,0,0,0.08);
      padding: 2rem;
    }

    h1, h2, h3 {
      color: var(--primary-dark);
      font-weight: 600;
      margin-top: 1.5rem;
    }

    h1 {
      background: var(--gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      font-size: 2.4rem;
    }

    p, li {
      color: var(--dark);
    }

    .section-icon {
      color: var(--primary);
      margin-right: .5rem;
    }

    .back-btn {
      margin-bottom: 2rem;
      background: var(--gradient);
      color: white;
      border: none;
      padding: .6rem 1.2rem;
      border-radius: 30px;
      font-weight: 500;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      transition: all 0.3s ease;
    }
    .back-btn:hover {
      background: var(--gradient-dark);
      transform: translateY(-2px);
      color: white;
    }
    .back-btn:focus {
      outline: none;
      box-shadow: 0 0 0 3px rgba(30, 165, 175, 0.5);
    }