:root {
    --bg-1: #f4f7fb;
    --bg-2: #e9eef7;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border: #dbe3ef;
    --primary: #1d4ed8;
    --primary-hover: #1e40af;
    --shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
    --radius-lg: 24px;
    --radius-md: 14px;
  }
  
  * {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text-main);
    background:
      radial-gradient(circle at top left, rgba(29, 78, 216, 0.08), transparent 35%),
      linear-gradient(180deg, var(--bg-1), var(--bg-2));
    min-height: 100vh;
  }
  
  .register-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
  }
  
  .register-card {
    background: var(--card-bg);
    border: 1px solid rgba(219, 227, 239, 0.8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 1.5rem;
  }
  
  @media (min-width: 768px) {
    .register-card {
      padding: 2rem;
    }
  }
  
  .custom-badge {
    background-color: rgba(29, 78, 216, 0.12);
    color: var(--primary);
    font-weight: 700;
    padding: 0.6rem 0.9rem;
    border-radius: 999px;
  }
  
  .register-title {
    font-size: clamp(1.8rem, 2vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.65rem;
  }
  
  .register-subtitle {
    color: var(--text-muted);
    font-size: 0.98rem;
    line-height: 1.6;
  }
  
  .form-label {
    font-weight: 700;
    margin-bottom: 0.55rem;
  }
  
  .custom-input {
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    min-height: 52px;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    box-shadow: none !important;
  }
  
  .custom-input:focus {
    border-color: rgba(29, 78, 216, 0.6);
    box-shadow: 0 0 0 0.2rem rgba(29, 78, 216, 0.12) !important;
  }
  
  .custom-textarea {
    min-height: 120px;
    resize: vertical;
  }
  
  .submit-btn {
    min-height: 54px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary), #2563eb);
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    transition: transform 0.18s ease, background 0.18s ease, opacity 0.18s ease;
  }
  
  .submit-btn:hover {
    background: linear-gradient(135deg, var(--primary-hover), #1d4ed8);
    color: #fff;
    transform: translateY(-1px);
  }
  
  .submit-btn:disabled {
    opacity: 0.85;
    cursor: not-allowed;
    transform: none;
  }
  
  .footer-note {
    color: var(--text-muted);
    font-size: 0.92rem;
  }
  
  .alert {
    border-radius: 14px;
    font-size: 0.96rem;
  }