* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background-color: #f4f7f6; display: flex; justify-content: center; align-items: center; height: 100vh; color: #333; }
.login-container { background: #fff; padding: 40px; border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,0.1); width: 100%; max-width: 400px; }
.login-header { text-align: center; margin-bottom: 30px; border-bottom: 2px solid #e0e0e0; padding-bottom: 20px; }
.login-header h2 { color: #1a202c; font-size: 24px; text-transform: uppercase; letter-spacing: 1px; }
.login-header p { color: #718096; font-size: 14px; margin-top: 5px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #4a5568; font-size: 14px; }
.form-group input { width: 100%; padding: 12px; border: 1px solid #cbd5e0; border-radius: 6px; font-size: 16px; transition: border-color 0.3s; }
.form-group input:focus { border-color: #3182ce; outline: none; box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1); }
button { width: 100%; padding: 14px; background-color: #2b6cb0; color: white; border: none; border-radius: 6px; font-size: 16px; font-weight: bold; cursor: pointer; transition: background-color 0.3s; }
button:hover { background-color: #2c5282; }
button:disabled { background-color: #a0aec0; cursor: not-allowed; }
.alert { padding: 12px; border-radius: 6px; margin-bottom: 20px; font-size: 14px; text-align: center; }
.alert.error { background-color: #fed7d7; color: #c53030; border: 1px solid #feb2b2; }
.alert.success { background-color: #c6f6d5; color: #276749; border: 1px solid #9ae6b4; }
.hidden { display: none; }