/* ===================================================================
 * §10 — components. One file, alphabetical-ish by component.
 * Use class names from this file rather than restyling raw elements.
 * =================================================================== */

/* §10.13 — nav-item (left rail) */
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  padding: 12px 20px 12px 12px;
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  text-decoration: none;
  font: var(--weight-regular) var(--text-h3)/1 var(--font-sans);
  transition: background-color var(--duration-fast) var(--ease-out);
  position: relative;
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.is-active { font-weight: var(--weight-bold); }
.nav-item i { font-size: 26px; }
.nav-item__badge {
  margin-left: auto;
  background: var(--like);
  color: var(--text-on-accent);
  font: var(--weight-bold) 11px/1.4 var(--font-sans);
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  min-width: 20px;
  text-align: center;
}
.nav-item--collapsed { width: 50px; height: 50px; padding: 0; justify-content: center; border-radius: 50%; }
.nav-item--collapsed span { display: none; }

/* "Go Premium" CTA — only rendered for non-premium users in main.php.
   Soft gold tint + gold icon distinguishes it from regular nav-items
   without competing with the purple Write button below it. */
.nav-item--premium {
  background: linear-gradient(135deg, rgba(245,158,11,0.12), rgba(245,158,11,0.04));
  font-weight: var(--weight-bold);
}
.nav-item--premium i { color: #F59E0B; }
.nav-item--premium:hover {
  background: linear-gradient(135deg, rgba(245,158,11,0.22), rgba(245,158,11,0.10));
}
.nav-item--premium:focus-visible {
  outline: 2px solid #F59E0B;
  outline-offset: 2px;
}

/* §10.14 — bottom tab bar */
.tab-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-default);
  padding: 8px 0;
  padding-bottom: max(8px, env(safe-area-inset-bottom));
  z-index: var(--z-sticky);
}
.tab-bar__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 4px;
  color: var(--text-tertiary);
  text-decoration: none;
  font-size: 10px;
}
.tab-bar__item i { font-size: 24px; }
.tab-bar__item.is-active { color: var(--accent); }
/* "Premium" upgrade item — only rendered for non-premium users in main.php.
   Gold icon + label match the left-rail .nav-item--premium treatment. */
.tab-bar__item--premium { color: #B45309; font-weight: var(--weight-bold); }
.tab-bar__item--premium i { color: #F59E0B; }
@media (max-width: 767px) { .tab-bar { display: flex; } }

/* §10.1 — button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font: var(--weight-bold) var(--text-body-sm)/1 var(--font-sans);
  padding: 0 20px;
  height: 40px;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-spring);
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-sm { height: 32px; padding: 0 14px; font-size: var(--text-caption); }
.btn-lg { height: 48px; padding: 0 24px; font-size: var(--text-body); }
.btn-block { width: 100%; }
.btn i { font-size: var(--icon-sm); }

.btn-primary { background: var(--accent); color: var(--text-on-accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--text-on-accent); }
.btn-primary:active { background: var(--accent-active); }

.btn-secondary { background: transparent; border-color: var(--border-strong); color: var(--text-primary); }
.btn-secondary:hover { background: var(--bg-hover); color: var(--text-primary); }

.btn-ghost { background: transparent; color: var(--text-primary); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); }

.btn-danger { background: var(--danger); color: var(--text-on-accent); }
.btn-danger:hover { background: var(--danger-600, #DC2626); color: var(--text-on-accent); }

.btn-light { background: var(--text-primary); color: var(--bg-primary); }
.btn-light:hover { background: var(--text-secondary); color: var(--bg-primary); }

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
  color: var(--text-primary);
  background: transparent;
}
.btn-icon:hover { background: var(--bg-hover); color: var(--text-primary); }
.btn-icon i { font-size: var(--icon-md); }
.btn-icon-sm { width: 32px; height: 32px; }
.btn-icon-sm i { font-size: var(--icon-sm); }

/* §10.2 — input */
.input-field {
  display: block;
  width: 100%;
  height: 44px;
  padding: 0 var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font: var(--weight-regular) var(--text-body)/1 var(--font-sans);
  transition: border-color var(--duration-fast) var(--ease-out),
              background-color var(--duration-fast) var(--ease-out);
}
.input-field::placeholder { color: var(--text-muted); }
.input-field:hover { border-color: var(--border-strong); }
.input-field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.input-field.is-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-soft);
}

.input-label {
  display: block;
  margin-bottom: 6px;
  font: var(--weight-medium) var(--text-body-sm)/1 var(--font-sans);
  color: var(--text-secondary);
}
.input-helper {
  margin-top: 6px;
  font: var(--weight-regular) var(--text-caption)/1.4 var(--font-sans);
  color: var(--text-tertiary);
}
.input-error {
  margin-top: 6px;
  font: var(--weight-regular) var(--text-caption)/1.4 var(--font-sans);
  color: var(--danger);
}

.textarea-field {
  display: block;
  width: 100%;
  min-height: 100px;
  padding: 12px var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font: var(--weight-regular) var(--text-body)/1.45 var(--font-sans);
  resize: vertical;
  transition: border-color var(--duration-fast) var(--ease-out);
}
.textarea-field:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.input-search { position: relative; }
.input-search__icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: var(--icon-sm);
  pointer-events: none;
}
.input-search .input-field {
  padding-left: 40px;
  background: var(--bg-secondary);
  border-radius: var(--radius-pill);
}

/* §10.3 — avatar */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--avatar-md);
  height: var(--avatar-md);
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: white;
  font: var(--weight-bold) var(--text-body-sm)/1 var(--font-sans);
  text-transform: uppercase;
  overflow: hidden;
  flex-shrink: 0;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; display: block; }
.avatar-xs  { width: var(--avatar-xs);  height: var(--avatar-xs);  font-size: 10px; }
.avatar-sm  { width: var(--avatar-sm);  height: var(--avatar-sm);  font-size: 12px; }
.avatar-lg  { width: var(--avatar-lg);  height: var(--avatar-lg);  font-size: 16px; }
.avatar-xl  { width: var(--avatar-xl);  height: var(--avatar-xl);  font-size: 28px; }
.avatar-2xl { width: var(--avatar-2xl); height: var(--avatar-2xl); font-size: 48px; border: 4px solid var(--bg-primary); }

/* §10.4 — chip */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  background: var(--accent-soft);
  color: var(--accent-text);
  border-radius: var(--radius-pill);
  font: var(--weight-medium) var(--text-nano)/1.4 var(--font-sans);
  white-space: nowrap;
  text-decoration: none;
}
.chip-neutral { background: var(--bg-tertiary); color: var(--text-secondary); }
.chip-success { background: var(--success-soft); color: var(--success); }
.chip-danger  { background: var(--danger-soft); color: var(--danger); }
.chip i { font-size: 12px; }

.chip-topic { cursor: pointer; transition: background-color var(--duration-fast) var(--ease-out); padding: 4px 12px; font-size: var(--text-caption); }
.chip-topic:hover { background: var(--violet-200); color: var(--violet-900); text-decoration: none; }
[data-theme="dark"] .chip-topic:hover { background: var(--violet-900); color: var(--violet-100); }
.chip-topic.is-active { background: var(--accent); color: var(--text-on-accent); }
.chip-topic.is-active:hover { background: var(--accent-hover); color: var(--text-on-accent); }

/* §10.5 — article card */
.card-article {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  padding: 12px var(--space-4);
  border-bottom: 1px solid var(--border-default);
  transition: background-color var(--duration-fast) var(--ease-out);
}
.card-article:hover { background: var(--bg-secondary); }
.card-article__avatar { display: block; text-decoration: none; }
.card-article__body   { min-width: 0; }
.card-article__head {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-body-sm);
  margin-bottom: 4px;
}
.card-article__name { font-weight: var(--weight-bold); color: var(--text-primary); text-decoration: none; }
.card-article__name:hover { text-decoration: underline; color: var(--text-primary); }
.card-article__handle,
.card-article__dot,
.card-article__time { color: var(--text-tertiary); }

.card-article__title {
  margin: 4px 0 6px;
  font: var(--weight-bold) var(--text-h4)/1.25 var(--font-sans);
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-article__title a { color: inherit; text-decoration: none; }
.card-article__title a:hover { color: var(--accent-text); }

.card-article__excerpt {
  margin: 0 0 10px;
  font: var(--weight-regular) var(--text-body-sm)/1.4 var(--font-sans);
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-article__hero {
  display: block;
  aspect-ratio: 16 / 9;
  margin-bottom: 10px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-default);
  background: var(--bg-tertiary);
}
.card-article__hero img { width: 100%; height: 100%; object-fit: cover; display: block; }

.card-article__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
  font: var(--weight-regular) var(--text-caption)/1.4 var(--font-sans);
  color: var(--text-tertiary);
}
.card-article__readtime { display: inline-flex; align-items: center; gap: 4px; }
.card-article__readtime i { font-size: 14px; }

.card-article__actions {
  display: flex;
  justify-content: space-between;
  max-width: 380px;
  font: var(--weight-regular) var(--text-caption)/1 var(--font-sans);
}

.card-article--compact { grid-template-columns: 32px 1fr; padding: 8px var(--space-4); }
.card-article--compact .card-article__excerpt,
.card-article--compact .card-article__hero,
.card-article--compact .card-article__actions { display: none; }

/* Action row (in card-article + reader__actions) */
.action {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  margin: -4px -8px;
  border-radius: var(--radius-pill);
  background: transparent;
  border: 0;
  color: var(--text-tertiary);
  font: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out),
              background-color var(--duration-fast) var(--ease-out);
}
.action i { font-size: 18px; }
.action:hover { color: var(--text-primary); background: var(--bg-hover); }
.action-like:hover     { color: var(--like);     background: var(--like-soft); }
.action-bookmark:hover { color: var(--bookmark); background: var(--bookmark-soft); }
.action-comment:hover  { color: var(--info);     background: var(--info-soft); }
.action-share:hover    { color: var(--info);     background: var(--info-soft); }
.action.is-active.action-like     { color: var(--like); }
.action.is-active.action-bookmark { color: var(--bookmark); }

@keyframes heartPop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.3); }
  100% { transform: scale(1); }
}
.action-like.is-active i { animation: heartPop 400ms var(--ease-spring); }

/* §10.6 — sidebar module */
.module {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 14px var(--space-4);
  margin-bottom: var(--space-4);
}
.module__title { font: var(--weight-bold) var(--text-h3)/1.3 var(--font-sans); color: var(--text-primary); margin: 0 0 14px; }
.module__body  { display: flex; flex-direction: column; gap: 12px; }
.module__link  { display: inline-block; margin-top: 14px; font-size: var(--text-caption); color: var(--accent-text); }
.module__link:hover { text-decoration: underline; }

/* §10.7 — tabs */
.tabs { display: flex; border-bottom: 1px solid var(--border-default); }
.tab {
  position: relative;
  padding: 16px 32px;
  font: var(--weight-medium) var(--text-body-sm)/1 var(--font-sans);
  color: var(--text-tertiary);
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  border: 0;
  flex: 1;
  text-align: center;
  transition: background-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}
.tab:hover { background: var(--bg-hover); color: var(--text-primary); }
.tab.is-active { color: var(--text-primary); font-weight: var(--weight-bold); }
.tab.is-active::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 56px;
  height: 4px;
  background: var(--accent);
  border-radius: 999px 999px 0 0;
}
.tab[aria-disabled="true"], .tab.is-disabled { opacity: 0.5; pointer-events: none; }

/* §10.8 — modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 64px var(--space-4);
  z-index: var(--z-modal-bg);
  animation: fadeIn var(--duration-base) var(--ease-out);
}
.modal {
  width: 100%;
  max-width: 600px;
  max-height: calc(100vh - 128px);
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  z-index: var(--z-modal);
  animation: modalIn var(--duration-base) var(--ease-out);
  box-shadow: 0 0 0 1px var(--border-default), 0 8px 24px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
}
.modal__head {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: center;
  gap: var(--space-4);
  padding: 12px var(--space-4);
  border-bottom: 1px solid var(--border-default);
  flex-shrink: 0;
}
.modal__title { font: var(--weight-bold) var(--text-h3)/1 var(--font-sans); margin: 0; color: var(--text-primary); }
.modal__body { padding: var(--space-6); overflow-y: auto; flex: 1 1 auto; min-height: 0; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalIn {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 767px) {
  .modal-backdrop { padding: 0; }
  .modal { max-width: none; max-height: 100vh; height: 100vh; border-radius: 0; border: 0; box-shadow: none; }
}

/* §10.9 — toast */
.toast-region {
  position: fixed;
  top: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  max-width: 400px;
  padding: 12px var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font: var(--weight-regular) var(--text-body-sm)/1.4 var(--font-sans);
  color: var(--text-primary);
  pointer-events: auto;
  animation: toastIn var(--duration-base) var(--ease-out);
}
.toast i { font-size: 18px; flex-shrink: 0; }
.toast-success { border-color: var(--success); }
.toast-success > i:first-child { color: var(--success); }
.toast-error { border-color: var(--danger); }
.toast-error > i:first-child { color: var(--danger); }
@keyframes toastIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* §10.10 — skeleton */
.skeleton {
  background: linear-gradient(90deg,
    var(--skeleton) 0%,
    var(--skeleton-shine) 50%,
    var(--skeleton) 100%);
  background-size: 200% 100%;
  animation: shimmer var(--duration-slower) ease-in-out infinite;
  border-radius: var(--radius-sm);
}
.skeleton-text   { height: 14px; margin-bottom: 8px; }
.skeleton-title  { height: 20px; margin-bottom: 12px; }
.skeleton-avatar { width: 40px; height: 40px; border-radius: 50%; }
.skeleton-image  { aspect-ratio: 16/9; border-radius: var(--radius-lg); }
@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* §10.11 — empty state */
.empty {
  text-align: center;
  padding: 64px var(--space-6);
}
.empty__icon {
  font-size: 40px;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  display: inline-block;
}
.empty__title { font: var(--weight-bold) var(--text-h2)/1.25 var(--font-sans); color: var(--text-primary); margin: 0 0 8px; }
.empty__desc  { font: var(--weight-regular) var(--text-body)/1.5 var(--font-sans); color: var(--text-secondary); max-width: 360px; margin: 0 auto 24px; }

/* §10.12 — dropdown menu */
.menu { position: relative; display: inline-block; }
.menu__list {
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  min-width: 200px;
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 4px;
  z-index: var(--z-dropdown);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
.menu__item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: 0;
  color: var(--text-primary);
  font: var(--weight-regular) var(--text-body-sm)/1 var(--font-sans);
  text-align: left;
  cursor: pointer;
  text-decoration: none;
  border-radius: var(--radius-sm);
}
.menu__item:hover { background: var(--bg-hover); color: var(--text-primary); }
.menu__item i { font-size: 18px; color: var(--text-tertiary); }
.menu__item--danger { color: var(--danger); }
.menu__item--danger i { color: var(--danger); }
.menu__divider { border: 0; border-top: 1px solid var(--border-default); margin: 4px 0; }

/* Topic typeahead picker (editor) */
.topic-picker__selected {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 32px;
  margin-bottom: 8px;
}
.topic-picker__selected:empty::before {
  content: "No topics selected yet";
  color: var(--text-muted);
  font: var(--weight-regular) var(--text-caption)/1 var(--font-sans);
}
.topic-picker__selected .chip-topic { padding-right: 8px; cursor: pointer; }
.topic-picker__selected .chip__x { margin-left: 4px; opacity: 0.7; font-weight: 700; }
.topic-picker__selected .chip-topic:hover .chip__x { opacity: 1; color: var(--like); }

.topic-picker__input-wrap { position: relative; }
.topic-picker__input { padding-left: 36px !important; height: 38px; }
.topic-picker__icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: var(--icon-sm);
  pointer-events: none;
}
.topic-picker__dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 4px;
  list-style: none;
  z-index: var(--z-dropdown);
  max-height: 280px;
  overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
.topic-picker__option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font: var(--weight-regular) var(--text-body-sm)/1.4 var(--font-sans);
  color: var(--text-primary);
}
.topic-picker__option:hover { background: var(--bg-hover); }
.topic-picker__option-name { font-weight: var(--weight-medium); }
.topic-picker__option-meta { color: var(--text-tertiary); font-size: var(--text-caption); }
.topic-picker__option--create { color: var(--accent-text); }
.topic-picker__option--create i { font-size: var(--icon-sm); margin-right: 6px; }
.topic-picker__option--create strong { color: var(--accent-text); margin-left: 4px; }
.topic-picker__option--err { color: var(--danger); cursor: default; }
.topic-picker__option--err:hover { background: transparent; }
.topic-picker__option--note { color: var(--text-tertiary); cursor: default; font-size: var(--text-caption); }
.topic-picker__option--note:hover { background: transparent; }

.topic-picker__auto-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.topic-picker__auto-list .chip-topic {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px dashed var(--border-strong);
  cursor: pointer;
}
.topic-picker__auto-list .chip-topic i { margin-right: 4px; }
.topic-picker__auto-list .chip-topic:hover {
  background: var(--accent-soft);
  color: var(--accent-text);
  border-color: var(--accent);
}