/**
 * Nature Index - Form Styles
 * Form controls, inputs, selects, etc.
 * =====================================
 */

/* ========================================
   Form Layout
   ======================================== */

.ni-form-group {
    margin-bottom: var(--ni-space-5);
}

.ni-form-row {
    display: flex;
    flex-wrap: wrap;
    margin-left: calc(var(--ni-space-4) * -0.5);
    margin-right: calc(var(--ni-space-4) * -0.5);
}

.ni-form-row > * {
    padding-left: calc(var(--ni-space-4) * 0.5);
    padding-right: calc(var(--ni-space-4) * 0.5);
}

.ni-form-col {
    flex: 1;
    min-width: 0;
}

.ni-form-inline {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--ni-space-3);
}

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

.ni-label {
    display: block;
    margin-bottom: var(--ni-space-2);
    font-size: var(--ni-text-sm);
    font-weight: var(--ni-font-medium);
    color: var(--ni-text-primary);
}

.ni-label-required::after {
    content: ' *';
    color: var(--ni-danger);
}

.ni-label-optional {
    font-weight: var(--ni-font-normal);
    color: var(--ni-text-muted);
    margin-left: var(--ni-space-1);
}

.ni-label-hint {
    font-weight: var(--ni-font-normal);
    font-size: 0.75rem;
    color: var(--ni-text-muted);
    margin-left: var(--ni-space-1);
}

/* ========================================
   Text Inputs
   ======================================== */

.ni-input {
    display: block;
    width: 100%;
    padding: var(--ni-space-3) var(--ni-space-4);
    font-family: var(--ni-font-primary);
    font-size: var(--ni-text-base);
    font-weight: var(--ni-font-normal);
    line-height: 1.5;
    color: var(--ni-text-primary);
    background-color: var(--ni-bg-surface);
    background-clip: padding-box;
    border: 1px solid var(--ni-border-color);
    border-radius: var(--ni-radius-md);
    transition: var(--ni-transition-colors), var(--ni-transition-shadow);
    appearance: none;
}

.ni-input:focus {
    outline: none;
    border-color: var(--ni-primary);
    box-shadow: 0 0 0 3px rgba(45, 90, 74, 0.15);
}

.ni-input:disabled,
.ni-input[readonly] {
    background-color: var(--ni-gray-100);
    opacity: 0.7;
    cursor: not-allowed;
}

.ni-input::placeholder {
    color: var(--ni-text-muted);
    opacity: 1;
}

/* Input Sizes */
.ni-input-sm {
    padding: var(--ni-space-2) var(--ni-space-3);
    font-size: var(--ni-text-sm);
}

.ni-input-lg {
    padding: var(--ni-space-4) var(--ni-space-5);
    font-size: var(--ni-text-lg);
}

/* Input States */
.ni-input.is-valid {
    border-color: var(--ni-success);
}

.ni-input.is-valid:focus {
    border-color: var(--ni-success);
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.15);
}

.ni-input.is-invalid {
    border-color: var(--ni-danger);
}

.ni-input.is-invalid:focus {
    border-color: var(--ni-danger);
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15);
}

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

.ni-textarea {
    min-height: 100px;
    resize: vertical;
}

.ni-textarea-autosize {
    resize: none;
    overflow: hidden;
}

/* ========================================
   Select
   ======================================== */

.ni-select {
    display: block;
    width: 100%;
    padding: var(--ni-space-3) var(--ni-space-10) var(--ni-space-3) var(--ni-space-4);
    font-family: var(--ni-font-primary);
    font-size: var(--ni-text-base);
    font-weight: var(--ni-font-normal);
    line-height: 1.5;
    color: var(--ni-text-primary);
    background-color: var(--ni-bg-surface);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23757575' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right var(--ni-space-3) center;
    background-size: 16px 12px;
    border: 1px solid var(--ni-border-color);
    border-radius: var(--ni-radius-md);
    transition: var(--ni-transition-colors), var(--ni-transition-shadow);
    appearance: none;
    cursor: pointer;
}

.ni-select:focus {
    outline: none;
    border-color: var(--ni-primary);
    box-shadow: 0 0 0 3px rgba(45, 90, 74, 0.15);
}

.ni-select:disabled {
    background-color: var(--ni-gray-100);
    opacity: 0.7;
    cursor: not-allowed;
}

.ni-select[multiple] {
    padding-right: var(--ni-space-4);
    background-image: none;
}

/* Select Sizes */
.ni-select-sm {
    padding: var(--ni-space-2) var(--ni-space-8) var(--ni-space-2) var(--ni-space-3);
    font-size: var(--ni-text-sm);
}

.ni-select-lg {
    padding: var(--ni-space-4) var(--ni-space-12) var(--ni-space-4) var(--ni-space-5);
    font-size: var(--ni-text-lg);
}

/* ========================================
   Checkbox & Radio
   ======================================== */

.ni-checkbox,
.ni-radio {
    display: flex;
    align-items: flex-start;
    gap: var(--ni-space-2);
    cursor: pointer;
}

.ni-checkbox-input,
.ni-radio-input {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    margin-top: 2px;
    background-color: var(--ni-bg-surface);
    border: 2px solid var(--ni-border-color-dark);
    transition: var(--ni-transition-colors);
    appearance: none;
    cursor: pointer;
}

.ni-checkbox-input {
    border-radius: var(--ni-radius-sm);
}

.ni-radio-input {
    border-radius: 50%;
}

.ni-checkbox-input:checked,
.ni-radio-input:checked {
    background-color: var(--ni-primary);
    border-color: var(--ni-primary);
}

.ni-checkbox-input:checked {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/%3e%3c/svg%3e");
    background-size: 14px;
    background-position: center;
    background-repeat: no-repeat;
}

.ni-radio-input:checked {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='2' fill='%23fff'/%3e%3c/svg%3e");
    background-size: 8px;
    background-position: center;
    background-repeat: no-repeat;
}

.ni-checkbox-input:focus,
.ni-radio-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(45, 90, 74, 0.15);
}

.ni-checkbox-input:disabled,
.ni-radio-input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.ni-checkbox-label,
.ni-radio-label {
    font-size: var(--ni-text-base);
    color: var(--ni-text-primary);
}

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

.ni-checkbox-group-inline,
.ni-radio-group-inline {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--ni-space-6);
}

/* ========================================
   Toggle Switch
   ======================================== */

.ni-switch {
    display: inline-flex;
    align-items: center;
    gap: var(--ni-space-3);
    cursor: pointer;
}

.ni-switch-input {
    position: relative;
    width: 44px;
    height: 24px;
    background-color: var(--ni-gray-300);
    border-radius: var(--ni-radius-full);
    transition: var(--ni-transition-colors);
    appearance: none;
    cursor: pointer;
}

.ni-switch-input::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background-color: var(--ni-white);
    border-radius: 50%;
    box-shadow: var(--ni-shadow-sm);
    transition: transform var(--ni-transition-fast);
}

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

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

.ni-switch-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(45, 90, 74, 0.15);
}

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

.ni-switch-label {
    font-size: var(--ni-text-base);
    color: var(--ni-text-primary);
}

/* ========================================
   Input Group
   ======================================== */

.ni-input-group {
    display: flex;
    position: relative;
}

.ni-input-group .ni-input {
    flex: 1;
    min-width: 0;
}

.ni-input-group .ni-input:not(:first-child) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.ni-input-group .ni-input:not(:last-child) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.ni-input-group-prepend,
.ni-input-group-append {
    display: flex;
    align-items: center;
    padding: var(--ni-space-3) var(--ni-space-4);
    font-size: var(--ni-text-base);
    font-weight: var(--ni-font-normal);
    color: var(--ni-text-secondary);
    background-color: var(--ni-gray-100);
    border: 1px solid var(--ni-border-color);
    white-space: nowrap;
}

.ni-input-group-prepend {
    border-right: 0;
    border-radius: var(--ni-radius-md) 0 0 var(--ni-radius-md);
}

.ni-input-group-append {
    border-left: 0;
    border-radius: 0 var(--ni-radius-md) var(--ni-radius-md) 0;
}

/* Input with Icon */
.ni-input-icon {
    position: relative;
}

.ni-input-icon .ni-input {
    padding-left: var(--ni-space-10);
}

.ni-input-icon-left {
    position: absolute;
    left: var(--ni-space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--ni-text-muted);
    pointer-events: none;
}

.ni-input-icon-right .ni-input {
    padding-left: var(--ni-space-4);
    padding-right: var(--ni-space-10);
}

.ni-input-icon-right .ni-input-icon-right-icon {
    position: absolute;
    right: var(--ni-space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--ni-text-muted);
}

/* ========================================
   Range Slider
   ======================================== */

.ni-range {
    width: 100%;
    height: 6px;
    background-color: var(--ni-gray-200);
    border-radius: var(--ni-radius-full);
    appearance: none;
    cursor: pointer;
}

.ni-range::-webkit-slider-thumb {
    width: 18px;
    height: 18px;
    background-color: var(--ni-primary);
    border: 2px solid var(--ni-white);
    border-radius: 50%;
    box-shadow: var(--ni-shadow-sm);
    cursor: pointer;
    appearance: none;
    transition: var(--ni-transition-transform);
}

.ni-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.ni-range::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background-color: var(--ni-primary);
    border: 2px solid var(--ni-white);
    border-radius: 50%;
    box-shadow: var(--ni-shadow-sm);
    cursor: pointer;
}

.ni-range:focus {
    outline: none;
}

.ni-range:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px rgba(45, 90, 74, 0.15);
}

/* ========================================
   File Input
   ======================================== */

.ni-file-input {
    display: block;
    width: 100%;
}

.ni-file-input::file-selector-button {
    padding: var(--ni-space-3) var(--ni-space-4);
    margin-right: var(--ni-space-4);
    font-family: var(--ni-font-primary);
    font-size: var(--ni-text-sm);
    font-weight: var(--ni-font-semibold);
    color: var(--ni-text-primary);
    background-color: var(--ni-gray-100);
    border: 1px solid var(--ni-border-color);
    border-radius: var(--ni-radius-md);
    cursor: pointer;
    transition: var(--ni-transition-colors);
}

.ni-file-input::file-selector-button:hover {
    background-color: var(--ni-gray-200);
}

/* File Drop Zone */
.ni-file-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--ni-space-10);
    border: 2px dashed var(--ni-border-color);
    border-radius: var(--ni-radius-lg);
    background-color: var(--ni-gray-50);
    text-align: center;
    cursor: pointer;
    transition: var(--ni-transition-colors);
}

.ni-file-dropzone:hover,
.ni-file-dropzone.is-dragover {
    border-color: var(--ni-primary);
    background-color: var(--ni-primary-lightest);
}

.ni-file-dropzone-icon {
    font-size: 2.5rem;
    color: var(--ni-text-muted);
    margin-bottom: var(--ni-space-4);
}

.ni-file-dropzone-text {
    font-size: var(--ni-text-base);
    color: var(--ni-text-secondary);
}

.ni-file-dropzone-hint {
    font-size: var(--ni-text-sm);
    color: var(--ni-text-muted);
    margin-top: var(--ni-space-2);
}

/* ========================================
   Help Text & Validation Messages
   ======================================== */

.ni-form-text {
    display: block;
    margin-top: var(--ni-space-2);
    font-size: var(--ni-text-sm);
    color: var(--ni-text-muted);
}

.ni-form-feedback {
    display: block;
    margin-top: var(--ni-space-2);
    font-size: var(--ni-text-sm);
}

.ni-form-feedback-valid {
    color: var(--ni-success);
}

.ni-form-feedback-invalid {
    color: var(--ni-danger);
}

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

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

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

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

/* ========================================
   Search Form
   ======================================== */

.ni-search-form {
    position: relative;
    display: flex;
    align-items: center;
}

.ni-search-input {
    padding-left: var(--ni-space-10);
    padding-right: var(--ni-space-10);
}

.ni-search-icon {
    position: absolute;
    left: var(--ni-space-4);
    color: var(--ni-text-muted);
    pointer-events: none;
}

.ni-search-clear {
    position: absolute;
    right: var(--ni-space-4);
    padding: var(--ni-space-1);
    background: none;
    border: none;
    color: var(--ni-text-muted);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--ni-transition-fast);
}

.ni-search-form:focus-within .ni-search-clear,
.ni-search-input:not(:placeholder-shown) + .ni-search-clear {
    opacity: 1;
    visibility: visible;
}

.ni-search-clear:hover {
    color: var(--ni-text-primary);
}