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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #1f2937;
    --light-bg: #f9fafb;
    --text-dark: #111827;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 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 {
    width: 100%;
    max-width: 450px;
}

.login-box {
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    padding: 40px 30px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.company-logo {
    max-width: 120px;
    max-height: 120px;
    margin-bottom: 20px;
    border-radius: 12px;
    background: white;
    padding: 10px;
}

.login-header h1 {
    font-size: 28px;
    font-weight: 900;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.login-header p {
    font-size: 14px;
    opacity: 0.95;
}

.alert {
    padding: 12px 20px;
    margin: 20px 30px 0;
    border-radius: 8px;
    font-size: 14px;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

.login-form {
    padding: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-block {
    width: 100%;
}

.login-footer {
    padding: 20px 30px;
    background-color: var(--light-bg);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 5px;
}

.login-footer .version {
    font-size: 12px;
    opacity: 0.7;
}

@media (max-width: 480px) {
    .login-box {
        border-radius: 12px;
    }
    
    .login-header {
        padding: 30px 20px 20px;
    }
    
    .login-header h1 {
        font-size: 24px;
    }
    
    .login-form {
        padding: 20px;
    }
    
    .alert {
        margin: 15px 20px 0;
    }
}