:root {
    --color-primary: #2563EB;
    --color-primary-hover: #1E40AF;
    --color-bg: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-border: #E2E8F0;
    --color-text-primary: #0F172A;
    --color-text-secondary: #64748B;
    --color-danger: #EF4444;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Inter', sans-serif;
    background: var(--color-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
  }
  
  .login-container {
    background: var(--color-surface);
    padding: 40px 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    width: 100%;
    max-width: 400px;
    text-align: center;
  }
  
  .login-container .logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 30px;
  }
  
  .login-container .logo img {
    height: 60px;
    width: auto;
    margin-bottom: 10px;
  }
  
  .login-container .logo span {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-primary);
  }
  
  .login-container h2 {
    font-size: 22px;
    margin-bottom: 20px;
    color: var(--color-text-primary);
  }
  
  .login-container form {
    display: flex;
    flex-direction: column;
    gap: 15px;
  }
  
  .login-container input[type="text"],
  .login-container input[type="password"] {
    padding: 12px 15px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    font-size: 14px;
    outline: none;
    transition: border 0.2s;
  }
  
  .login-container input[type="text"]:focus,
  .login-container input[type="password"]:focus {
    border-color: var(--color-primary);
  }
  
  .login-container button {
    padding: 12px;
    background: var(--color-primary);
    color: white;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s;
  }
  
  .login-container button:hover {
    background: var(--color-primary-hover);
  }
  
  .login-container .links {
    margin-top: 15px;
    font-size: 14px;
    color: var(--color-text-secondary);
    display: flex;
    justify-content: space-between;
  }
  
  .login-container .links a {
    color: var(--color-primary);
    text-decoration: none;
  }
  
  .login-container .links a:hover {
    text-decoration: underline;
  }
  
  /* Responsive */
  @media (max-width: 500px) {
    .login-container {
      padding: 30px 20px;
    }
  }