* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    color: #333;
    font-size: 2em;
    font-weight: 300;
    margin-bottom: 10px;
}

.login-header p {
    color: #666;
    font-size: 0.95em;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: 500;
    font-size: 0.9em;
}

.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-group input[type="email"]:focus,
.form-group input[type="password"]:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 8px;
    transform: scale(1.1);
    accent-color: #667eea;
}

.checkbox-group label {
    color: #666;
    font-size: 0.9em;
    cursor: pointer;
}

.login-btn {
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.login-btn:active {
    transform: translateY(0);
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 0.9em;
}

.alert.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.login-footer {
    text-align: center;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #e1e1e1;
}

.login-footer p {
    color: #666;
    font-size: 0.85em;
}

.demo-credentials {
    background: #e3f2fd;
    border: 1px solid #bbdefb;
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 20px;
}

.demo-credentials h4 {
    color: #1976d2;
    margin-bottom: 8px;
    font-size: 0.9em;
}

.demo-credentials p {
    color: #1565c0;
    font-size: 0.85em;
    margin: 2px 0;
    font-family: 'Courier New', monospace;
}

@media (max-width: 480px) {
    .login-container {
        padding: 30px 20px;
        margin: 10px;
    }

    .login-header h1 {
        font-size: 1.6em;
    }
}

.loading {
    display: none;
}

.loading.show {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-right: 8px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}