/**
 * Form Components
 * Professional form styling with validation states
 */

/* =============================================================================
   BASE FORM CONTROLS
   ============================================================================= */

.form-control,
.form-select,
textarea {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-surface);
    background-clip: padding-box;
    border: var(--border-width-1) solid var(--color-border);
    border-radius: var(--radius-md);
    transition: var(--transition-colors), var(--transition-shadow);
}

.form-control::placeholder {
    color: var(--color-text-muted);
    opacity: 1;
}

.form-control:focus,
.form-select:focus,
textarea:focus {
    color: var(--color-text);
    background-color: var(--color-surface);
    border-color: var(--color-primary);
    outline: 0;
    box-shadow: var(--shadow-focus);
}

.form-control:disabled,
.form-select:disabled,
textarea:disabled {
    background-color: var(--color-gray-100);
    opacity: 0.6;
    cursor: not-allowed;
}

/* =============================================================================
   FORM LABELS
   ============================================================================= */

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

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

/* =============================================================================
   FORM TEXT & HELPERS
   ============================================================================= */

.form-text {
    display: block;
    margin-top: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* =============================================================================
   VALIDATION STATES
   ============================================================================= */

/* Valid State */
.form-control.is-valid,
.form-select.is-valid {
    border-color: var(--color-success);
}

.form-control.is-valid:focus,
.form-select.is-valid:focus {
    border-color: var(--color-success);
    box-shadow: var(--shadow-focus-success);
}

.valid-feedback {
    display: none;
    margin-top: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-success);
}

.form-control.is-valid ~ .valid-feedback,
.form-select.is-valid ~ .valid-feedback {
    display: block;
}

/* Invalid State */
.form-control.is-invalid,
.form-select.is-invalid {
    border-color: var(--color-danger);
}

.form-control.is-invalid:focus,
.form-select.is-invalid:focus {
    border-color: var(--color-danger);
    box-shadow: var(--shadow-focus-danger);
}

.invalid-feedback {
    display: none;
    margin-top: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-danger);
}

.form-control.is-invalid ~ .invalid-feedback,
.form-select.is-invalid ~ .invalid-feedback {
    display: block;
}

/* =============================================================================
   FORM SIZES
   ============================================================================= */

.form-control-sm,
.form-select-sm {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}

.form-control-lg,
.form-select-lg {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-lg);
}

/* =============================================================================
   INPUT GROUPS
   ============================================================================= */

.input-group {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    width: 100%;
}

.input-group > .form-control,
.input-group > .form-select {
    position: relative;
    flex: 1 1 auto;
    width: 1%;
    min-width: 0;
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    text-align: center;
    white-space: nowrap;
    background-color: var(--color-gray-100);
    border: var(--border-width-1) solid var(--color-border);
    border-radius: var(--radius-md);
}

.input-group > :not(:first-child) {
    margin-left: calc(var(--border-width-1) * -1);
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

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

/* =============================================================================
   CHECKBOXES & RADIOS
   ============================================================================= */

.form-check {
    display: block;
    min-height: 1.5rem;
    padding-left: var(--space-6);
    margin-bottom: var(--space-2);
}

.form-check-input {
    width: 1.125rem;
    height: 1.125rem;
    margin-top: 0.125rem;
    margin-left: calc(var(--space-6) * -1);
    vertical-align: top;
    background-color: var(--color-surface);
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: var(--border-width-1) solid var(--color-border);
    appearance: none;
    print-color-adjust: exact;
    cursor: pointer;
    transition: var(--transition-colors);
}

.form-check-input[type="checkbox"] {
    border-radius: var(--radius-sm);
}

.form-check-input[type="radio"] {
    border-radius: 50%;
}

.form-check-input:checked {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.form-check-input[type="checkbox"]: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 10l3 3l6-6'/%3e%3c/svg%3e");
}

.form-check-input[type="radio"]: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");
}

.form-check-input:focus {
    border-color: var(--color-primary);
    outline: 0;
    box-shadow: var(--shadow-focus);
}

.form-check-label {
    cursor: pointer;
}

/* Switch */
.form-switch .form-check-input {
    width: 2.5rem;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='rgba(0,0,0,0.25)'/%3e%3c/svg%3e");
    background-position: left center;
    border-radius: 2rem;
}

.form-switch .form-check-input:checked {
    background-position: right center;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23fff'/%3e%3c/svg%3e");
}

/* =============================================================================
   SELECT DROPDOWN
   ============================================================================= */

.form-select {
    padding-right: var(--space-8);
    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='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    background-size: 16px 12px;
    appearance: none;
}

[data-theme="dark"] .form-select {
    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='%23f8f9fa' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
}

/* =============================================================================
   TEXTAREA
   ============================================================================= */

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

/* =============================================================================
   FILE INPUT
   ============================================================================= */

.form-control[type="file"] {
    overflow: hidden;
}

.form-control[type="file"]:not(:disabled):not([readonly]) {
    cursor: pointer;
}

/* =============================================================================
   RANGE INPUT
   ============================================================================= */

.form-range {
    width: 100%;
    height: 1.5rem;
    padding: 0;
    background-color: transparent;
    appearance: none;
}

.form-range:focus {
    outline: 0;
}

.form-range::-webkit-slider-thumb {
    width: 1rem;
    height: 1rem;
    margin-top: -0.25rem;
    background-color: var(--color-primary);
    border: 0;
    border-radius: 1rem;
    appearance: none;
    cursor: pointer;
}

.form-range::-webkit-slider-runnable-track {
    width: 100%;
    height: 0.5rem;
    color: transparent;
    cursor: pointer;
    background-color: var(--color-gray-200);
    border-color: transparent;
    border-radius: 1rem;
}

.form-range::-moz-range-thumb {
    width: 1rem;
    height: 1rem;
    background-color: var(--color-primary);
    border: 0;
    border-radius: 1rem;
    appearance: none;
    cursor: pointer;
}

.form-range::-moz-range-track {
    width: 100%;
    height: 0.5rem;
    color: transparent;
    cursor: pointer;
    background-color: var(--color-gray-200);
    border-color: transparent;
    border-radius: 1rem;
}

/* =============================================================================
   FORM LAYOUT
   ============================================================================= */

.form-group {
    margin-bottom: var(--space-4);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    margin-right: calc(var(--space-3) * -0.5);
    margin-left: calc(var(--space-3) * -0.5);
}

.form-row > * {
    padding-right: calc(var(--space-3) * 0.5);
    padding-left: calc(var(--space-3) * 0.5);
}

/* =============================================================================
   RESPONSIVE DESIGN
   ============================================================================= */

@media (max-width: 768px) {
    .form-control,
    .form-select,
    textarea {
        font-size: var(--font-size-base);
    }
    
    .form-label {
        font-size: var(--font-size-sm);
    }
}