/* Login Page Styles */
:root {
    --login-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --login-card-bg: rgba(255, 255, 255, 0.95);
    --login-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    --login-border-radius: 16px;
    --form-input-bg: #f8fafc;
    --form-input-border: #e2e8f0;
    --form-input-focus: #667eea;
    --error-color: #ef4444;
    --success-color: #10b981;
}

.login-main {
    min-height: calc(100vh - 200px);
    background: var(--login-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 0;
}

.login-container {
    width: 100%;
    max-width: 450px;
    position: relative;
}

.login-card,
.register-card {
    background: var(--login-card-bg);
    border-radius: var(--login-border-radius);
    box-shadow: var(--login-shadow);
    padding: 2.5rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.register-card {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    opacity: 0;
    visibility: hidden;
    transform: translateX(100%);
    transition: all 0.3s ease;
}

.register-card.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.login-card.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateX(-100%);
}

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

.login-header h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

.form-group {
    margin-bottom: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--form-input-border);
    border-radius: 8px;
    background: var(--form-input-bg);
    font-size: 0.875rem;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

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

.form-group input.error {
    border-color: var(--error-color);
}

.form-group input.success {
    border-color: var(--success-color);
}

/* Checkbox Styles */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--form-input-border);
    border-radius: 4px;
    margin-right: 0.5rem;
    position: relative;
    transition: all 0.2s ease;
    background: white;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--form-input-focus);
    border-color: var(--form-input-focus);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.forgot-password {
    font-size: 0.875rem;
    color: var(--form-input-focus);
    text-decoration: none;
    transition: color 0.2s ease;
}

.forgot-password:hover {
    color: #5a67d8;
}

.terms-link {
    color: var(--form-input-focus);
    text-decoration: none;
}

.terms-link:hover {
    text-decoration: underline;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: #5a67d8;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-ghost {
    background: transparent;
    color: var(--form-input-focus);
    border: 2px solid var(--form-input-focus);
}

.btn-ghost:hover {
    background: var(--form-input-focus);
    color: white;
}

.btn-full {
    width: 100%;
}

/* Divider */
.login-divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
}

.login-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--form-input-border);
}

.login-divider span {
    background: var(--login-card-bg);
    padding: 0 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Register Section */
.register-section {
    text-align: center;
}

.register-section p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Error Messages */
.error-message {
    color: var(--error-color);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    display: none;
}

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

/* Success Messages */
.success-message {
    color: var(--success-color);
    font-size: 0.875rem;
    text-align: center;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Loading State */
.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 640px) {
    .login-main {
        padding: 1rem;
    }
    
    .login-card,
    .register-card {
        padding: 2rem 1.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .login-header h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .login-card,
    .register-card {
        padding: 1.5rem 1rem;
    }
    
    .login-header h2 {
        font-size: 1.25rem;
    }
}