:root {
    --primary-color: #4a90e2;
    --secondary-color: #5cb85c;
    --danger-color: #d9534f;
    --warning-color: #f0ad4e;
    --dark-color: #333;
    --light-color: #f4f4f4;
    --border-color: #ddd;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    line-height: 1.6;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

.auth-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 450px;
    padding: 2rem;
}

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

.auth-header h1 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.25);
}

.form-actions {
    margin-top: 2rem;
}

.btn {
    display: inline-block;
    background-color: var(--light-color);
    color: var(--dark-color);
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
}

.btn:hover {
    opacity: 0.9;
}

.btn:focus {
    outline: none;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
}

.auth-links {
    text-align: center;
    margin-top: 1.5rem;
}

.error-message {
    color: var(--danger-color);
    background-color: rgba(217, 83, 79, 0.1);
    border: 1px solid rgba(217, 83, 79, 0.2);
    padding: 0.8rem;
    border-radius: 4px;
    margin-top: 1.5rem;
    display: none;
}

.error-message.show {
    display: block;
}