:root {
    --primary: #2c3e50;
    --secondary: #3498db;
    --success: #27ae60;
    --danger: #e74c3c;
    --light: #ecf0f1;
    --dark: #34495e;
    --text: #333;
    --border: #dfe6e9;
    --radius: 8px;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Base */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: #f5f7fa;
    margin: 0;
    padding: 0;
}

/* Container */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
}

/* Card */
.auth-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.5rem;
    width: 100%;
    max-width: 500px;
}

/* Header */
.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header i {
    font-size: 3rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.auth-header h1 {
    color: var(--primary);
    margin: 0;
    font-size: 1.8rem;
}

/* Form */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #2980b9;
}

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

.btn-danger:hover {
    background-color: #c0392b;
}

.btn-secondary {
    background-color: var(--light);
    color: var(--text);
}

.btn-secondary:hover {
    background-color: #d5dbdb;
}

/* Footer */
.auth-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text);
}

.auth-footer a {
    color: var(--secondary);
    font-weight: 500;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid #f5c6cb;
}

/* Actions */
.auth-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.auth-actions .btn {
    flex: 1;
    text-align: center;
}

/* Message */
.auth-message {
    text-align: center;
    margin: 1.5rem 0;
    font-size: 1.1rem;
    color: var(--text);
}

/* Responsive */
@media (max-width: 768px) {
    .auth-card {
        padding: 1.5rem;
    }
    
    .auth-actions {
        flex-direction: column;
    }
}