:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #48bb78;
    --error-color: #f56565;
    --text-dark: #2d3748;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --border-color: #e2e8f0;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
}

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

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

.auth-container {
    width: 100%;
    max-width: 450px;
}

.auth-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.auth-header h1 {
    color: var(--text-dark);
    font-size: 28px;
    margin-bottom: 10px;
    font-weight: 700;
}

.auth-header p {
    color: var(--text-light);
    font-size: 14px;
}

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

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

.form-group label {
    display: block;
    color: var(--text-dark);
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: var(--bg-light);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group small {
    display: block;
    color: var(--text-light);
    font-size: 12px;
    margin-top: 5px;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    font-size: 14px;
}

.checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox input {
    margin-left: 8px;
    cursor: pointer;
}

.checkbox span {
    color: var(--text-dark);
}

.link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.link:hover {
    color: var(--primary-dark);
}

.btn {
    padding: 14px 24px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.btn-block {
    width: 100%;
    display: block;
}

.auth-footer {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.auth-footer p {
    color: var(--text-light);
    font-size: 14px;
}

.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error {
    background: #fff5f5;
    color: #c53030;
    border: 1px solid #feb2b2;
}

.alert-success {
    background: #f0fff4;
    color: #2f855a;
    border: 1px solid #9ae6b4;
}

/* RTL Support */
[dir="rtl"] .checkbox input {
    margin-left: 0;
    margin-right: 8px;
}

/* Responsive */
@media (max-width: 480px) {
    .auth-card {
        padding: 30px 20px;
    }
    
    .auth-header h1 {
        font-size: 24px;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}