/**
 * Forms.css - Modern Form Components
 * Part of Office-AI-ze v2.0 UI/UX Upgrade (Phase 3)
 * ClickUp-inspired form inputs with floating labels, validation states, modern styling
 */

/* =============================================================================
   Form Container
   ============================================================================= */

.form-modern {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.form-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.form-section-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-semibold);
    color: var(--color-gray-900);
    margin-bottom: var(--space-2);
}

.dark .form-section-title {
    color: var(--dark-text-primary);
}

.form-section-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--space-4);
}

.dark .form-section-description {
    color: var(--dark-text-secondary);
}

/* =============================================================================
   Form Groups
   ============================================================================= */

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    position: relative;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

/* =============================================================================
   Labels
   ============================================================================= */

.form-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.dark .form-label {
    color: var(--dark-text-secondary);
}

.form-label-required::after {
    content: '*';
    color: var(--color-danger);
    margin-left: var(--space-1);
}

.form-label-optional {
    font-size: var(--font-size-xs);
    font-weight: var(--font-normal);
    color: var(--color-gray-500);
    margin-left: auto;
}

.dark .form-label-optional {
    color: var(--dark-text-tertiary);
}

/* =============================================================================
   Input Base
   ============================================================================= */

.input-modern {
    width: 100%;
    height: 44px;
    padding: 0 var(--space-3);
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    color: var(--color-gray-900);
    background: var(--color-white);
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    transition: all 150ms ease;
    outline: none;
}

.dark .input-modern {
    color: var(--dark-text-primary);
    background: var(--dark-bg-secondary);
    border-color: var(--dark-border);
}

.input-modern::placeholder {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
}

.dark .input-modern::placeholder {
    color: var(--dark-text-tertiary);
}

/* Focus State */
.input-modern:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.dark .input-modern:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(123, 104, 238, 0.2);
}

/* Hover State */
.input-modern:hover:not(:focus):not(:disabled) {
    border-color: var(--color-gray-400);
}

.dark .input-modern:hover:not(:focus):not(:disabled) {
    border-color: var(--color-gray-600);
}

/* Disabled State */
.input-modern:disabled {
    background: var(--color-gray-100);
    color: var(--color-gray-500);
    cursor: not-allowed;
    opacity: 0.6;
}

.dark .input-modern:disabled {
    background: var(--dark-bg-tertiary);
    color: var(--dark-text-tertiary);
}

/* =============================================================================
   Input Sizes
   ============================================================================= */

.input-sm {
    height: 36px;
    font-size: var(--font-size-sm);
    padding: 0 var(--space-2);
}

.input-lg {
    height: 52px;
    font-size: var(--font-size-lg);
    padding: 0 var(--space-4);
}

/* =============================================================================
   Input with Icons
   ============================================================================= */

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon-left .input-modern {
    padding-left: 40px;
}

.input-icon-right .input-modern {
    padding-right: 40px;
}

.input-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-500);
    font-size: 18px;
    pointer-events: none;
}

.dark .input-icon {
    color: var(--dark-text-tertiary);
}

.input-icon-left .input-icon {
    left: var(--space-3);
}

.input-icon-right .input-icon {
    right: var(--space-3);
}

/* Clickable Icon (Clear, Password Toggle) */
.input-icon-clickable {
    pointer-events: auto;
    cursor: pointer;
    transition: color 150ms ease;
}

.input-icon-clickable:hover {
    color: var(--color-primary);
}

/* =============================================================================
   Floating Labels
   ============================================================================= */

.input-floating-container {
    position: relative;
    display: flex;
    flex-direction: column;
}

.input-floating {
    padding: 18px var(--space-3) 6px;
}

.label-floating {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-base);
    color: var(--color-gray-500);
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    background: transparent;
    padding: 0 var(--space-1);
}

.dark .label-floating {
    color: var(--dark-text-tertiary);
}

/* Float label when focused or has value */
.input-floating:focus ~ .label-floating,
.input-floating:not(:placeholder-shown) ~ .label-floating {
    top: 8px;
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    background: var(--color-white);
}

.dark .input-floating:focus ~ .label-floating,
.dark .input-floating:not(:placeholder-shown) ~ .label-floating {
    background: var(--dark-bg-secondary);
}

/* =============================================================================
   Textarea
   ============================================================================= */

.textarea-modern {
    min-height: 100px;
    padding: var(--space-3);
    resize: vertical;
    font-family: var(--font-sans);
    line-height: 1.6;
}

.textarea-modern.resize-none {
    resize: none;
}

.textarea-modern.autosize {
    overflow: hidden;
}

/* Character Counter */
.textarea-counter {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    text-align: right;
    margin-top: var(--space-1);
}

.dark .textarea-counter {
    color: var(--dark-text-tertiary);
}

.textarea-counter.limit-reached {
    color: var(--color-danger);
}

/* =============================================================================
   Select (Dropdown)
   ============================================================================= */

.select-modern {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    padding-right: 40px;
}

.dark .select-modern {
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%239CA3AF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

/* Multiple Select */
.select-modern[multiple] {
    height: auto;
    padding: var(--space-2);
    background-image: none;
}

.select-modern[multiple] option {
    padding: var(--space-2);
    border-radius: var(--radius-sm);
}

/* =============================================================================
   Checkbox
   ============================================================================= */

.checkbox-container {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    user-select: none;
}

.checkbox-modern {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    cursor: pointer;
    position: relative;
    transition: all 150ms ease;
    flex-shrink: 0;
}

.dark .checkbox-modern {
    border-color: var(--dark-border);
    background: var(--dark-bg-secondary);
}

.checkbox-modern:checked {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.checkbox-modern:checked::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
    width: 5px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
}

.checkbox-modern:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.checkbox-modern:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.checkbox-label {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
}

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

/* =============================================================================
   Radio
   ============================================================================= */

.radio-container {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    user-select: none;
}

.radio-modern {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-gray-300);
    border-radius: 50%;
    background: var(--color-white);
    cursor: pointer;
    position: relative;
    transition: all 150ms ease;
    flex-shrink: 0;
}

.dark .radio-modern {
    border-color: var(--dark-border);
    background: var(--dark-bg-secondary);
}

.radio-modern:checked {
    border-color: var(--color-primary);
}

.radio-modern:checked::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    background: var(--color-primary);
    border-radius: 50%;
}

.radio-modern:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.radio-modern:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.radio-label {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
}

.dark .radio-label {
    color: var(--dark-text-secondary);
}

/* Radio Group */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.radio-group-horizontal {
    flex-direction: row;
    gap: var(--space-6);
}

/* =============================================================================
   Switch (Toggle)
   ============================================================================= */

.switch-container {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    user-select: none;
}

.switch-modern {
    appearance: none;
    width: 44px;
    height: 24px;
    background: var(--color-gray-300);
    border-radius: 24px;
    position: relative;
    cursor: pointer;
    transition: background 200ms ease;
    flex-shrink: 0;
}

.dark .switch-modern {
    background: var(--dark-border);
}

.switch-modern::after {
    content: '';
    position: absolute;
    left: 3px;
    top: 3px;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.switch-modern:checked {
    background: var(--color-primary);
}

.switch-modern:checked::after {
    transform: translateX(20px);
}

.switch-modern:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.switch-modern:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.switch-label {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
}

.dark .switch-label {
    color: var(--dark-text-secondary);
}

/* =============================================================================
   Validation States
   ============================================================================= */

/* Success */
.input-success {
    border-color: var(--color-success);
}

.input-success:focus {
    border-color: var(--color-success);
    box-shadow: 0 0 0 3px var(--color-success-light);
}

.form-message-success {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-1);
}

/* Error */
.input-error {
    border-color: var(--color-danger);
}

.input-error:focus {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 3px var(--color-danger-light);
}

.form-message-error {
    font-size: var(--font-size-sm);
    color: var(--color-danger);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-1);
}

/* Warning */
.input-warning {
    border-color: var(--color-warning);
}

.input-warning:focus {
    border-color: var(--color-warning);
    box-shadow: 0 0 0 3px var(--color-warning-light);
}

.form-message-warning {
    font-size: var(--font-size-sm);
    color: var(--color-warning);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-1);
}

/* Help Text */
.form-help-text {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-top: var(--space-1);
}

.dark .form-help-text {
    color: var(--dark-text-tertiary);
}

/* =============================================================================
   File Upload
   ============================================================================= */

.file-upload-container {
    position: relative;
}

.file-upload-modern {
    appearance: none;
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
}

.file-upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    padding: var(--space-8);
    border: 2px dashed var(--color-gray-300);
    border-radius: var(--radius-lg);
    background: var(--color-gray-50);
    cursor: pointer;
    transition: all 200ms ease;
}

.dark .file-upload-label {
    border-color: var(--dark-border);
    background: var(--dark-bg-secondary);
}

.file-upload-label:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.file-upload-modern:focus + .file-upload-label {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.file-upload-icon {
    font-size: 48px;
    color: var(--color-gray-400);
}

.dark .file-upload-icon {
    color: var(--dark-text-tertiary);
}

.file-upload-text {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
    text-align: center;
}

.dark .file-upload-text {
    color: var(--dark-text-secondary);
}

.file-upload-subtext {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.dark .file-upload-subtext {
    color: var(--dark-text-tertiary);
}

/* File Preview */
.file-preview {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    margin-top: var(--space-3);
}

.dark .file-preview {
    background: var(--dark-bg-secondary);
    border-color: var(--dark-border);
}

.file-preview-icon {
    font-size: 32px;
    color: var(--color-primary);
}

.file-preview-info {
    flex: 1;
    min-width: 0;
}

.file-preview-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-medium);
    color: var(--color-gray-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dark .file-preview-name {
    color: var(--dark-text-primary);
}

.file-preview-size {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
}

.dark .file-preview-size {
    color: var(--dark-text-tertiary);
}

.file-preview-remove {
    color: var(--color-gray-500);
    cursor: pointer;
    transition: color 150ms ease;
}

.file-preview-remove:hover {
    color: var(--color-danger);
}

/* =============================================================================
   Form Actions
   ============================================================================= */

.form-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-gray-200);
}

.dark .form-actions {
    border-top-color: var(--dark-border);
}

.form-actions-right {
    justify-content: flex-end;
}

.form-actions-between {
    justify-content: space-between;
}

/* =============================================================================
   Search Input
   ============================================================================= */

.search-input-container {
    position: relative;
    width: 100%;
}

.search-input {
    padding-left: 40px;
    padding-right: 40px;
}

.search-input-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-500);
    pointer-events: none;
}

.search-input-clear {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-500);
    cursor: pointer;
    opacity: 0;
    transition: opacity 150ms ease;
}

.search-input:not(:placeholder-shown) + .search-input-icon + .search-input-clear {
    opacity: 1;
}

.search-input-clear:hover {
    color: var(--color-danger);
}

/* =============================================================================
   Responsive
   ============================================================================= */

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .form-actions button {
        width: 100%;
    }
    
    .radio-group-horizontal {
        flex-direction: column;
        gap: var(--space-3);
    }
}