:root {
--primary-color: #2563eb;
--primary-dark: #1d4ed8;
--success-color: #059669;
--danger-color: #dc2626;
--warning-color: #d97706;
--gray-50: #f9fafb;
--gray-100: #f3f4f6;
--gray-200: #e5e7eb;
--gray-300: #d1d5db;
--gray-400: #9ca3af;
--gray-500: #6b7280;
--gray-600: #4b5563;
--gray-700: #374151;
--gray-800: #1f2937;
--gray-900: #111827;
}

* {
box-sizing: border-box;
}

body {
font-family: 'Inter', system-ui, -apple-system, sans-serif;
background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
margin: 0;
padding: 1rem;
}

.auth-container {
width: 100%;
max-width: 400px;
}

.auth-card {
background: white;
border-radius: 16px;
box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
border: 1px solid var(--gray-200);
overflow: hidden;
}

.auth-header {
padding: 2rem 2rem 1rem;
text-align: center;
border-bottom: 1px solid var(--gray-100);
}

.auth-header h1 {
font-size: 1.5rem;
font-weight: 600;
color: var(--gray-900);
margin: 0 0 0.5rem;
}

.auth-header p {
color: var(--gray-600);
font-size: 0.875rem;
margin: 0;
}

.auth-body {
padding: 2rem;
}

.form-floating {
margin-bottom: 1rem;
}

.form-floating > .form-control {
height: 3.5rem;
border: 2px solid var(--gray-200);
border-radius: 8px;
font-size: 0.875rem;
transition: all 0.2s ease;
}

.form-floating > .form-control:focus {
border-color: var(--primary-color);
box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-floating > label {
color: var(--gray-500);
font-size: 0.875rem;
font-weight: 500;
}

.btn-primary {
background: var(--primary-color);
border: none;
border-radius: 8px;
height: 3rem;
font-weight: 600;
font-size: 0.875rem;
transition: all 0.2s ease;
width: 100%;
}

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

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

.auth-links {
text-align: center;
margin-top: 1.5rem;
padding-top: 1.5rem;
border-top: 1px solid var(--gray-100);
}

.auth-links a {
color: var(--primary-color);
text-decoration: none;
font-weight: 500;
font-size: 0.875rem;
transition: color 0.2s ease;
}

.auth-links a:hover {
color: var(--primary-dark);
text-decoration: underline;
}

.auth-links .separator {
color: var(--gray-400);
margin: 0 0.5rem;
}

.alert {
border-radius: 8px;
border: none;
font-size: 0.875rem;
margin-bottom: 1rem;
}

.alert-danger {
background-color: #fef2f2;
color: var(--danger-color);
}

.alert-success {
background-color: #f0fdf4;
color: var(--success-color);
}

.invalid-feedback {
font-size: 0.75rem;
margin-top: 0.25rem;
}

.form-control.is-invalid {
border-color: var(--danger-color);
}

@media (max-width: 480px) {
body {
padding: 0.5rem;
}

.auth-header {
padding: 1.5rem 1.5rem 1rem;
}

.auth-body {
padding: 1.5rem;
}

.auth-header h1 {
font-size: 1.25rem;
}
}