/* ============================================================
   러비너프 Core Components
   Token-based. Namespace: .ln- prefix to avoid legacy collision.
   Updated: 2026-04-14
============================================================ */

/* ============================================================
   0. BASE — defensive box-sizing for all ln-* components
============================================================ */
.ln-card,
.ln-btn,
.ln-tabs,
.ln-tabs__item,
.ln-option,
.ln-option-group,
.ln-list__item,
.ln-page,
.ln-input,
.ln-textarea,
.ln-select {
  box-sizing: border-box;
}

/* Page wrapper utility — outer padding inside container/r_col */
.ln-page {
  width: 100%;
  padding: var(--space-4);
}

/* ============================================================
   1. BUTTON  .ln-btn
============================================================ */
.ln-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--touch-target);
  padding: 0 var(--space-5);
  font-family: var(--font-family-base);
  font-size: var(--text-md);
  font-weight: var(--fw-semibold);
  line-height: 1;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  user-select: none;
  white-space: nowrap;
}
.ln-btn:active {
  transform: scale(0.98);
}
.ln-btn:disabled,
.ln-btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}
/* Default (unstyled) hover — light gray bg */
.ln-btn:hover:not(:disabled):not([class*="ln-btn--"]) {
  background: var(--color-surface-sunken);
  border-color: var(--color-border-strong);
}

/* Variants — all hover states preserve text contrast */
.ln-btn--primary {
  color: var(--color-text-on-primary);
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.ln-btn--primary:hover:not(:disabled) {
  color: var(--color-text-on-primary);
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.ln-btn--secondary {
  color: var(--color-primary);
  background: var(--color-surface);
  border-color: var(--color-primary);
}
.ln-btn--secondary:hover:not(:disabled) {
  color: var(--color-primary-strong);
  background: var(--color-primary-soft);
  border-color: var(--color-primary-strong);
}

.ln-btn--ghost {
  color: var(--color-text-sub);
  background: transparent;
  border-color: transparent;
}
.ln-btn--ghost:hover:not(:disabled) {
  color: var(--color-text);
  background: var(--color-surface-sunken);
}

.ln-btn--danger {
  color: #fff;
  background: var(--color-danger);
  border-color: var(--color-danger);
}
.ln-btn--danger:hover:not(:disabled) {
  color: #fff;
  background: #e83333;
  border-color: #e83333;
}

/* Sizes */
.ln-btn--sm {
  min-height: 36px;
  padding: 0 var(--space-4);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
}
.ln-btn--lg {
  min-height: 52px;
  padding: 0 var(--space-6);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}
.ln-btn--block {
  width: 100%;
}

/* Icon inside button */
.ln-btn > .ti {
  font-size: 1.2em;
}

/* ============================================================
   2. CARD  .ln-card
============================================================ */
.ln-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--color-border);
}
.ln-card--flat {
  box-shadow: none;
  border: none;
}
.ln-card--outlined {
  box-shadow: none;
}
.ln-card--sunken {
  background: var(--color-surface-sunken);
  border: none;
  box-shadow: none;
}
.ln-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}
.ln-card__title {
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  color: var(--color-text);
}
.ln-card__body {
  color: var(--color-text-sub);
  line-height: var(--lh-normal);
}

/* ============================================================
   3. FORM FIELD  .ln-field
============================================================ */
.ln-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.ln-field__label {
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
}
.ln-field__label--required::after {
  content: "*";
  color: var(--color-danger);
  margin-left: 2px;
}
.ln-field__hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.ln-field__error {
  font-size: var(--text-xs);
  color: var(--color-danger);
}
.ln-field.is-invalid .ln-input {
  border-color: var(--color-danger);
}

.ln-input,
.ln-textarea,
.ln-select {
  width: 100%;
  min-height: var(--touch-target);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-family-base);
  font-size: var(--text-md);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-fast) var(--ease-out);
  box-sizing: border-box;
}
.ln-input::placeholder,
.ln-textarea::placeholder {
  color: var(--color-text-placeholder);
}
.ln-input:focus,
.ln-textarea:focus,
.ln-select:focus {
  outline: none;
  border-color: var(--color-primary);
}
.ln-textarea {
  min-height: 100px;
  resize: vertical;
  line-height: var(--lh-normal);
}

.ln-field-row {
  display: flex;
  gap: var(--space-3);
}
.ln-field-row > .ln-input {
  flex: 1;
}

/* Checkbox / Radio */
.ln-check {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-sub);
}
.ln-check input[type="checkbox"],
.ln-check input[type="radio"] {
  accent-color: var(--color-primary);
  width: 18px;
  height: 18px;
}

/* ============================================================
   4. TAB  .ln-tabs
============================================================ */
.ln-tabs {
  display: flex;
  width: 100%;
  margin: 0 0 var(--space-5);
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--color-border);
  box-sizing: border-box;
}
.ln-tabs__item {
  flex: 1;
  padding: var(--space-4) 0;
  text-align: center;
  font-size: var(--text-md);
  font-weight: var(--fw-semibold);
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.ln-tabs__item > a {
  display: block;
  color: inherit;
  text-decoration: none;
}
.ln-tabs__item.is-active,
.ln-tabs__item.is-active > a {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ============================================================
   5. LIST  .ln-list
============================================================ */
.ln-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
}
.ln-list__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease-out);
}
.ln-list__item:hover {
  background: var(--color-surface-alt);
}
.ln-list__item-title {
  font-size: var(--text-md);
  font-weight: var(--fw-medium);
}
.ln-list__item-meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   6. BADGE  .ln-badge
============================================================ */
.ln-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  color: var(--color-text-sub);
  background: var(--color-surface-sunken);
  border-radius: var(--radius-sm);
  line-height: 1;
  white-space: nowrap;
}
.ln-badge--primary {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}
.ln-badge--success {
  color: var(--color-success);
  background: var(--color-success-soft);
}
.ln-badge--danger {
  color: var(--color-danger);
  background: var(--color-danger-soft);
}

/* ============================================================
   7. TOAST / ALERT  .ln-toast
============================================================ */
.ln-toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--bottom-nav-height) + var(--space-4));
  transform: translateX(-50%);
  min-width: 200px;
  max-width: calc(100% - var(--space-8));
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  color: #fff;
  background: rgba(34, 34, 34, 0.92);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-toast);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.ln-toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(-4px);
}

/* ============================================================
   8. MODAL / SHEET  .ln-modal
============================================================ */
.ln-modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}
.ln-modal-backdrop.is-open {
  opacity: 1;
}
.ln-modal {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -48%) scale(0.96);
  width: min(calc(100% - var(--space-8)), 360px);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-modal);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.ln-modal.is-open {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}
.ln-modal__title {
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.ln-modal__body {
  font-size: var(--text-sm);
  color: var(--color-text-sub);
  line-height: var(--lh-normal);
  margin-bottom: var(--space-5);
}
.ln-modal__actions {
  display: flex;
  gap: var(--space-2);
}
.ln-modal__actions > .ln-btn {
  flex: 1;
}

/* ============================================================
   9. TOGGLE SWITCH  .ln-switch
============================================================ */
.ln-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 26px;
  flex-shrink: 0;
}
.ln-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.ln-switch__slider {
  position: absolute;
  inset: 0;
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
  transition: background var(--dur-fast) var(--ease-out);
  cursor: pointer;
}
.ln-switch__slider::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 3px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-fast) var(--ease-out);
}
.ln-switch input:checked + .ln-switch__slider {
  background: var(--color-primary);
}
.ln-switch input:checked + .ln-switch__slider::before {
  transform: translateX(18px);
}

/* ============================================================
   9b. OPTION LIST  .ln-option
   Card-style selectable radio (payment amounts, settings, etc.)
============================================================ */
.ln-option-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.ln-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
  user-select: none;
}
.ln-option:hover {
  border-color: var(--color-border-strong);
}
/* Hide native radio/checkbox visually but keep accessible.
   Selection state is conveyed by .ln-option:has(input:checked) below. */
.ln-option input[type="radio"],
.ln-option input[type="checkbox"] {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
  pointer-events: none;
}
/* Restore visible focus ring only for keyboard navigation */
.ln-option:focus-within {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.ln-option__body {
  flex: 1;
  min-width: 0;
}
.ln-option__title {
  font-size: var(--text-md);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
}
.ln-option__desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
  line-height: var(--lh-normal);
}
.ln-option__aside {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
  flex-shrink: 0;
}
.ln-option:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

/* ============================================================
   10. EMPTY STATE  .ln-empty
============================================================ */
.ln-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-10) var(--space-5);
  text-align: center;
  color: var(--color-text-muted);
}
.ln-empty__icon {
  font-size: 48px;
  color: var(--color-text-placeholder);
  margin-bottom: var(--space-3);
}
.ln-empty__title {
  font-size: var(--text-md);
  color: var(--color-text-sub);
  margin-bottom: var(--space-2);
}
.ln-empty__desc {
  font-size: var(--text-sm);
  line-height: var(--lh-normal);
}

/* ============================================================
   11. DIVIDER  .ln-divider
============================================================ */
.ln-divider {
  height: 1px;
  background: var(--color-border);
  border: 0;
  margin: var(--space-5) 0;
}
.ln-divider--strong {
  background: var(--color-border-strong);
}

/* ============================================================
   12. STACK / UTILITY
   Minimal layout helpers to reduce ad-hoc inline styles
============================================================ */
.ln-stack {
  display: flex;
  flex-direction: column;
}
.ln-stack--1 { gap: var(--space-1); }
.ln-stack--2 { gap: var(--space-2); }
.ln-stack--3 { gap: var(--space-3); }
.ln-stack--4 { gap: var(--space-4); }
.ln-stack--5 { gap: var(--space-5); }
.ln-stack--6 { gap: var(--space-6); }

.ln-row {
  display: flex;
  align-items: center;
}
.ln-row--between { justify-content: space-between; }
.ln-row--center  { justify-content: center; }
.ln-row--gap-2   { gap: var(--space-2); }
.ln-row--gap-3   { gap: var(--space-3); }
.ln-row--gap-4   { gap: var(--space-4); }

/* Text utility */
.ln-text-xs  { font-size: var(--text-xs); }
.ln-text-sm  { font-size: var(--text-sm); }
.ln-text-md  { font-size: var(--text-md); }
.ln-text-lg  { font-size: var(--text-lg); }
.ln-text-muted { color: var(--color-text-muted); }
.ln-text-sub   { color: var(--color-text-sub); }
.ln-text-primary { color: var(--color-primary); }
.ln-text-bold  { font-weight: var(--fw-bold); }

/* Spacing utility */
.ln-mt-2 { margin-top: var(--space-2); }
.ln-mt-3 { margin-top: var(--space-3); }
.ln-mt-4 { margin-top: var(--space-4); }
.ln-mt-5 { margin-top: var(--space-5); }
.ln-mb-2 { margin-bottom: var(--space-2); }
.ln-mb-3 { margin-bottom: var(--space-3); }
.ln-mb-4 { margin-bottom: var(--space-4); }
.ln-mb-5 { margin-bottom: var(--space-5); }