/* ============================================================
   GradSpark — Molecules (Stage 3)
   Composed from Stage-1 tokens and Stage-2 atoms only.
   Naming: .gs-<molecule>[__<part>][--<variant>]
   ============================================================ */

/* ============================================================
   ListItem · used in nav, dropdowns, lists, search results
   ============================================================ */
.gs-list {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.gs-list--flush { border: 0; border-radius: 0; background: transparent; }

.gs-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  border: 0;
  text-align: left;
  width: 100%;
  text-decoration: none;
  border-bottom: 1px solid var(--border-default);
  transition: background-color var(--duration-2) var(--ease-out);
}
.gs-list-item:last-child { border-bottom: 0; }
.gs-list-item:hover { background: var(--bg-muted); }
.gs-list-item:focus-visible { outline: none; box-shadow: var(--shadow-focus) inset; }
.gs-list-item[aria-selected="true"],
.gs-list-item[aria-current="page"],
.gs-list-item--active {
  background: var(--color-blue-100);
  color: var(--color-blue-700);
}
[data-theme="dark"] .gs-list-item[aria-selected="true"],
[data-theme="dark"] .gs-list-item--active {
  background: rgba(37,99,235,0.18);
  color: var(--color-blue-300);
}
.gs-list-item[aria-disabled="true"],
.gs-list-item:disabled {
  color: var(--text-disabled);
  cursor: not-allowed;
}

.gs-list-item__icon { color: var(--text-tertiary); flex: 0 0 auto; }
.gs-list-item__main { display: flex; flex-direction: column; gap: 2px; flex: 1; min-width: 0; }
.gs-list-item__title {
  font-size: 14px;
  font-weight: var(--fw-medium);
  color: inherit;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.gs-list-item__sub {
  font-size: 12px;
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.gs-list-item__meta {
  font-size: 12px;
  color: var(--text-tertiary);
  flex: 0 0 auto;
}
.gs-list-item__chevron { color: var(--text-tertiary); flex: 0 0 auto; }

/* ============================================================
   Tabs · two looks (line, pill); horizontal only.
   ============================================================ */
.gs-tabs {
  display: flex;
  align-items: stretch;
  gap: var(--space-1);
  position: relative;
}

/* Line tabs (default) */
.gs-tabs--line {
  border-bottom: 1px solid var(--border-default);
  gap: var(--space-6);
}
.gs-tab {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  transition: color var(--duration-2) var(--ease-out);
  white-space: nowrap;
}
.gs-tab:hover { color: var(--text-primary); }
.gs-tab:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-sm);
}
.gs-tab[aria-selected="true"] {
  color: var(--text-primary);
}
.gs-tabs--line .gs-tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--action-primary-default);
  border-radius: 2px 2px 0 0;
}
.gs-tab[aria-disabled="true"], .gs-tab:disabled { color: var(--text-disabled); cursor: not-allowed; }

/* Pill tabs */
.gs-tabs--pill {
  padding: var(--space-1);
  background: var(--bg-muted);
  border-radius: var(--radius-md);
  display: inline-flex;
  gap: 0;
}
.gs-tabs--pill .gs-tab {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
}
.gs-tabs--pill .gs-tab[aria-selected="true"] {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-1);
}

/* Tab badge slot uses the existing .gs-badge atom */

/* Full-width variant — distribute tabs evenly */
.gs-tabs--full { width: 100%; }
.gs-tabs--full .gs-tab { flex: 1; justify-content: center; }

.gs-tab-panel {
  padding-block: var(--space-6);
}
.gs-tab-panel[hidden] { display: none; }

/* ============================================================
   Pagination
   ============================================================ */
.gs-pagination {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}
.gs-page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 var(--space-2);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font: inherit;
  font-size: 14px;
  font-weight: var(--fw-medium);
  cursor: pointer;
  transition: background-color var(--duration-2) var(--ease-out), color var(--duration-2) var(--ease-out);
}
.gs-page-btn:hover:not(:disabled):not([aria-current="page"]) { background: var(--bg-muted); color: var(--text-primary); }
.gs-page-btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.gs-page-btn[aria-current="page"] {
  background: var(--action-primary-default);
  color: #fff;
}
.gs-page-btn:disabled {
  color: var(--text-disabled);
  cursor: not-allowed;
}
.gs-page-ellipsis {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  color: var(--text-tertiary);
  user-select: none;
}

/* ============================================================
   Breadcrumb
   ============================================================ */
.gs-breadcrumb {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 14px;
  color: var(--text-tertiary);
}
.gs-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: inherit;
}
.gs-breadcrumb__link {
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  padding: 2px 4px;
  margin: -2px -4px;
}
.gs-breadcrumb__link:hover { color: var(--text-primary); text-decoration: underline; }
.gs-breadcrumb__link:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.gs-breadcrumb__current {
  color: var(--text-primary);
  font-weight: var(--fw-semibold);
}
.gs-breadcrumb__sep { color: var(--text-tertiary); display: inline-flex; }

/* ============================================================
   SearchBar — input + slash hint + clear button
   ============================================================ */
.gs-search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 40px;
  padding: 0 var(--space-3);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-2) var(--ease-out), box-shadow var(--duration-2) var(--ease-out);
  width: 100%;
  max-width: 480px;
}
.gs-search:focus-within {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
}
.gs-search__field {
  flex: 1;
  border: 0;
  outline: none;
  background: transparent;
  font: inherit;
  color: inherit;
  min-width: 0;
}
.gs-search__field::placeholder { color: var(--text-tertiary); }
.gs-search__icon { color: var(--text-tertiary); flex: 0 0 auto; }
.gs-search__clear {
  display: none;
  padding: 4px;
  border-radius: 50%;
  color: var(--text-tertiary);
  background: transparent;
  border: 0;
  cursor: pointer;
}
.gs-search__clear:hover { background: var(--bg-muted); color: var(--text-primary); }
.gs-search[data-has-value="true"] .gs-search__clear { display: inline-flex; }

.gs-search--lg { height: 48px; padding: 0 var(--space-4); }
.gs-search--xl { height: 56px; padding: 0 var(--space-5); font-size: 18px; }

/* ============================================================
   Toolbar — horizontal grouped controls
   ============================================================ */
.gs-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
}
.gs-toolbar__group {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}
.gs-toolbar__divider {
  width: 1px;
  align-self: stretch;
  background: var(--border-default);
}
.gs-toolbar--ghost {
  background: transparent;
  border: 0;
  padding: 0;
}

/* Segmented control — group of buttons that act like a single toggle */
.gs-segmented {
  display: inline-flex;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  padding: 2px;
  gap: 2px;
}
.gs-segmented__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: 6px;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font: inherit;
  font-size: 14px;
  font-weight: var(--fw-medium);
  cursor: pointer;
  white-space: nowrap;
}
.gs-segmented__btn:hover { color: var(--text-primary); }
.gs-segmented__btn[aria-pressed="true"] {
  background: var(--bg-muted);
  color: var(--text-primary);
  box-shadow: var(--shadow-1);
}
.gs-segmented__btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

/* ============================================================
   Stepper — wizard step indicator
   ============================================================ */
.gs-stepper {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 0;
}
.gs-step {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 0 0 auto;
}
.gs-step__index {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1.5px solid var(--border-strong);
  color: var(--text-tertiary);
  font-size: 13px;
  font-weight: var(--fw-semibold);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  transition: background-color var(--duration-2) var(--ease-out), border-color var(--duration-2) var(--ease-out), color var(--duration-2) var(--ease-out);
}
.gs-step__index .gs-icon { width: 14px; height: 14px; stroke-width: 2.5; }
.gs-step__label {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.gs-step__title {
  font-size: 13px;
  font-weight: var(--fw-semibold);
  color: var(--text-tertiary);
}
.gs-step__desc {
  font-size: 12px;
  color: var(--text-tertiary);
}

.gs-step--active .gs-step__index {
  background: var(--action-primary-default);
  border-color: var(--action-primary-default);
  color: #fff;
}
.gs-step--active .gs-step__title { color: var(--text-primary); }

.gs-step--complete .gs-step__index {
  background: var(--color-green-500);
  border-color: var(--color-green-500);
  color: #fff;
}
.gs-step--complete .gs-step__title { color: var(--text-secondary); }

.gs-step__connector {
  flex: 1;
  height: 2px;
  background: var(--border-default);
  margin: 0 var(--space-3);
  border-radius: 2px;
}
.gs-step__connector--filled { background: var(--color-green-500); }

/* Vertical stepper (for sidebar wizards) */
.gs-stepper--vertical {
  flex-direction: column;
  align-items: flex-start;
}
.gs-stepper--vertical .gs-step__connector {
  width: 2px;
  height: 32px;
  margin: 4px 0 4px 13px;
  flex: 0 0 auto;
}

/* ============================================================
   FormField groups — Fieldset + horizontal label layout
   ============================================================ */
.gs-fieldset {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  border: 0;
  padding: 0;
  margin: 0;
}
.gs-fieldset__legend {
  font-size: 14px;
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}
.gs-fieldset__hint {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}

/* Side-by-side label + control layout (settings forms) */
.gs-field--horizontal {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-6);
  align-items: start;
}
.gs-field--horizontal .gs-field__label {
  padding-top: var(--space-2);
}
@media (max-width: 767px) {
  .gs-field--horizontal {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .gs-field--horizontal .gs-field__label { padding-top: 0; }
}

/* Input group — radio/checkbox cluster styled as cards */
.gs-choice-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--duration-2) var(--ease-out), background-color var(--duration-2) var(--ease-out);
}
.gs-choice-card:hover { border-color: var(--border-strong); }
.gs-choice-card:has(input:checked) {
  border-color: var(--action-primary-default);
  background: var(--color-blue-50);
}
[data-theme="dark"] .gs-choice-card:has(input:checked) {
  background: rgba(37,99,235,0.10);
}
.gs-choice-card__body { display: flex; flex-direction: column; gap: 2px; }
.gs-choice-card__title { font-size: 14px; font-weight: var(--fw-semibold); color: var(--text-primary); }
.gs-choice-card__desc { font-size: 13px; color: var(--text-tertiary); }