/* ========================================
   Form Container
   ======================================== */
.form-container {
    max-width: 720px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

/* ========================================
   Progress Bar
   ======================================== */
.progress-wrapper {
    padding: var(--space-6);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-6);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    width: 20%;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    gap: var(--space-2);
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    flex: 1;
    opacity: 0.5;
    transition: opacity var(--transition-base);
}

.progress-step.active,
.progress-step.completed {
    opacity: 1;
}

.progress-step-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.progress-step-icon svg {
    width: 20px;
    height: 20px;
    color: var(--gray-500);
    transition: color var(--transition-base);
}

.progress-step.active .progress-step-icon {
    background: var(--gradient-primary);
}

.progress-step.active .progress-step-icon svg {
    color: var(--white);
}

.progress-step.completed .progress-step-icon {
    background: var(--success-500);
}

.progress-step.completed .progress-step-icon svg {
    color: var(--white);
}

.progress-step-label {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--gray-500);
    text-align: center;
    display: none;
}

@media (min-width: 640px) {
    .progress-step-label {
        display: block;
    }
}

.progress-step.active .progress-step-label {
    color: var(--primary-600);
}

.progress-step.completed .progress-step-label {
    color: var(--success-500);
}

/* ========================================
   Form Steps
   ======================================== */
.diagnostic-form {
    padding: var(--space-6);
}

@media (min-width: 640px) {
    .diagnostic-form {
        padding: var(--space-8);
    }
}

.form-step {
    display: none;
    animation: fadeIn 0.4s ease;
}

.form-step.active {
    display: block;
}

/* Step Header */
.step-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
}

.step-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--primary-100);
    border-radius: var(--radius-xl);
    flex-shrink: 0;
}

.step-icon svg {
    width: 28px;
    height: 28px;
    color: var(--primary-600);
}

.step-info {
    flex: 1;
}

.step-info .step-title {
    font-size: var(--text-xl);
    color: var(--gray-900);
    margin-bottom: var(--space-1);
}

.step-info .step-description {
    font-size: var(--text-sm);
    color: var(--gray-500);
}

/* ========================================
   Form Groups
   ======================================== */
.form-group {
    margin-bottom: var(--space-6);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

.required {
    color: var(--danger-500);
}

.form-hint {
    display: block;
    font-size: var(--text-xs);
    color: var(--gray-500);
    margin-top: var(--space-2);
}

.form-explanation {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    padding: var(--space-3);
    background: var(--primary-100);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    font-size: var(--text-sm);
    color: var(--primary-700);
}

.form-explanation svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ========================================
   Form Inputs
   ======================================== */
.form-input,
.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    color: var(--gray-900);
    background: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-600);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input::placeholder {
    color: var(--gray-400);
}

.form-input.error,
.form-select.error {
    border-color: var(--danger-500);
}

.form-input.error:focus,
.form-select.error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    background-size: 20px;
    padding-right: var(--space-10);
}

/* ========================================
   Radio Cards
   ======================================== */
.radio-cards {
    display: grid;
    gap: var(--space-3);
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
}

.radio-cards-horizontal {
    grid-template-columns: repeat(3, 1fr);
}

.radio-cards-vertical {
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .radio-cards-vertical {
        grid-template-columns: repeat(2, 1fr);
    }
}

.radio-card {
    position: relative;
    cursor: pointer;
}

.radio-card input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.radio-card-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    padding: var(--space-4);
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    text-align: center;
    min-height: 80px;
}

.radio-card:hover .radio-card-content {
    border-color: var(--primary-300);
    background: var(--gray-50);
}

.radio-card input:checked + .radio-card-content {
    border-color: var(--primary-600);
    background: var(--primary-100);
}

.radio-card input:focus + .radio-card-content {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.radio-card-icon {
    width: 32px;
    height: 32px;
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.radio-card input:checked + .radio-card-content .radio-card-icon {
    color: var(--primary-600);
}

.radio-card-value {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--gray-700);
}

.radio-card input:checked + .radio-card-content .radio-card-value {
    color: var(--primary-700);
}

.radio-card-label {
    font-size: var(--text-xs);
    color: var(--gray-500);
}

/* ========================================
   Checkbox Cards
   ======================================== */
.checkbox-cards {
    display: grid;
    gap: var(--space-3);
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.checkbox-card {
    position: relative;
    cursor: pointer;
}

.checkbox-card input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-card-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4);
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    text-align: center;
    min-height: 90px;
}

.checkbox-card:hover .checkbox-card-content {
    border-color: var(--primary-300);
    background: var(--gray-50);
}

.checkbox-card input:checked + .checkbox-card-content {
    border-color: var(--primary-600);
    background: var(--primary-100);
}

.checkbox-card input:focus + .checkbox-card-content {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.checkbox-card-icon {
    width: 28px;
    height: 28px;
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.checkbox-card input:checked + .checkbox-card-content .checkbox-card-icon {
    color: var(--primary-600);
}

.checkbox-card-value {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--gray-700);
}

.checkbox-card input:checked + .checkbox-card-content .checkbox-card-value {
    color: var(--primary-700);
}

.checkbox-card-desc {
    font-size: var(--text-xs);
    color: var(--gray-500);
}

/* ========================================
   Conditional Fields
   ======================================== */
.conditional-field {
    display: none;
    animation: fadeIn 0.3s ease;
}

.conditional-field.visible {
    display: block;
}

/* ========================================
   Form Navigation
   ======================================== */
.form-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--space-4);
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
}

.form-navigation .btn {
    flex: 1;
    max-width: 200px;
}

.form-navigation .btn-secondary {
    background: var(--gray-100);
    border-color: var(--gray-300);
    color: var(--gray-700);
}

.form-navigation .btn-secondary:hover {
    background: var(--gray-200);
}

.form-navigation .btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.form-navigation .btn-secondary:disabled:hover {
    background: var(--gray-100);
}

.form-navigation .btn-submit {
    display: none;
    background: var(--gradient-primary);
}

.form-navigation .btn-submit.visible {
    display: inline-flex;
}

/* ========================================
   Form Validation States
   ======================================== */
.form-group.has-error .form-input,
.form-group.has-error .form-select {
    border-color: var(--danger-500);
}

.form-group.has-error .form-hint {
    color: var(--danger-500);
}

.form-group.has-success .form-input,
.form-group.has-success .form-select {
    border-color: var(--success-500);
}

.error-message {
    display: none;
    font-size: var(--text-xs);
    color: var(--danger-500);
    margin-top: var(--space-1);
}

.form-group.has-error .error-message {
    display: block;
}

/* ========================================
   Loading State
   ======================================== */
.btn.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn.loading span,
.btn.loading svg {
    visibility: hidden;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 22px;
    height: 22px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   Error Message Styles
   ======================================== */
.error-message {
    display: block;
    font-size: var(--text-xs);
    color: var(--danger-500);
    margin-top: var(--space-2);
    padding-left: var(--space-1);
    animation: fadeIn 0.3s ease;
}

.error-message::before {
    content: '⚠ ';
}

.form-group.has-error .radio-cards .radio-card-content,
.form-group.has-error .checkbox-cards .checkbox-card-content {
    border-color: var(--danger-500);
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 639px) {
    .form-container {
        margin: 0 calc(-1 * var(--space-4));
        border-radius: 0;
        box-shadow: none;
    }
    
    .progress-wrapper {
        padding: var(--space-4);
    }
    
    .progress-step-icon {
        width: 32px;
        height: 32px;
    }
    
    .progress-step-icon svg {
        width: 16px;
        height: 16px;
    }
    
    .diagnostic-form {
        padding: var(--space-4);
    }
    
    .step-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .radio-cards-horizontal {
        grid-template-columns: 1fr;
    }
    
    .form-navigation {
        flex-direction: column;
    }
    
    .form-navigation .btn {
        max-width: none;
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.form-step.slide-in-right {
    animation: slideInRight 0.4s ease;
}

.form-step.slide-in-left {
    animation: slideInLeft 0.4s ease;
}