/* panels: shared styles; retain order with the other component sheets. */
@layer components {
/* ---------- 11. 彈窗與面板 ---------- */
.settings,
.library,
.admin-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0;
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
}

.settings {
  width: min(560px, calc(100vw - 24px));
  max-height: calc(100dvh - 24px);
}

.library {
  width: min(560px, calc(100vw - 24px));
  max-height: calc(100dvh - 24px);
}

.admin-dialog {
  width: min(860px, calc(100vw - 24px));
  max-height: calc(100dvh - 24px);
}

.settings::backdrop,
.library::backdrop,
.admin-dialog::backdrop {
  background: var(--backdrop);
}

.settings-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  max-height: calc(100vh - 24px);
  
  overflow-y: auto;
  overscroll-behavior: contain;
}

.settings-form h2 {
  margin: 0 0 2px;
  font-size: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.settings-form .field {
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
}

.row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.row.end {
  justify-content: flex-end;
}

.check {
  font-size: 13px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.check input {
  accent-color: var(--accent);
}

.status {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  min-height: 18px;
}

/* 直向 flex 表單內的項目不被壓縮，避免多行說明文字溢出去蓋到下一項 */
.settings-form > * {
  flex-shrink: 0;
}

.status[data-kind="ok"] {
  color: var(--ok);
}

.status[data-kind="error"] {
  color: var(--danger);
}

.settings a {
  color: var(--accent);
}

/* ---------- 12. 我的作業／錯題本／學習檔案 ---------- */
.library-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  max-height: calc(100vh - 24px);
  
  overflow-y: auto;
  overscroll-behavior: contain;
}

.library-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.library-head h2 {
  margin: 0;
  font-size: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.library-hint,
.library-usage,
.library-empty {
  margin: 0;
}

.library-empty {
  text-align: left;
  padding: 20px 0;
}

.library-list {
  flex: 1;
  min-height: 0;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.library-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-wrap: wrap;
  min-width: 0;
  background: var(--panel);
  transition: background var(--dur-fast) var(--ease);
}

@media (hover: hover) {
  .library-row:hover {
    background: var(--panel-2);
  }
}

.library-row.current {
  border-color: var(--accent);
  background: var(--accent-soft);
  cursor: default;
}

.library-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.library-name {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.library-badge {
  flex: none;
  background: none;
  color: var(--muted);
  padding: 0;
  font-size: 11px;
  font-weight: 600;
}

.library-badge.cached {
  color: var(--muted);
}

.library-meta {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.library-actions {
  flex: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.library-backup {
  flex: none;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

/* 私人學習書櫃：封面、紙頁與連續層架 */
.bookshelf-dialog { width: min(1000px, calc(100vw - 32px)); }
.bookshelf-dialog .library-panel { padding: 34px 40px 20px; gap: 0; }
.bookshelf-dialog .library-head { align-items: flex-start; margin-bottom: 16px; }
.bookshelf-eyebrow { display: block; color: var(--muted); font-size: 11px; letter-spacing: .18em; margin-bottom: 10px; }
.bookshelf-dialog .library-head h2 { display: block; font-size: clamp(26px, 4vw, 34px); font-weight: 500; letter-spacing: .06em; }
.bookshelf-title-dot { color: var(--accent); }
.bookshelf-dialog .library-hint { max-width: 580px; line-height: 1.8; }
.bookshelf-caption { display: flex; justify-content: space-between; gap: 16px; color: var(--muted); font-size: 11px; padding: 22px 0 12px; margin-top: 6px; border-bottom: 1px solid var(--border); }
#library-count { flex-shrink: 0; font-variant-numeric: tabular-nums; }
.bookshelf-grid {
  flex: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: 30px;
  row-gap: 36px;
  padding: 30px 12px 24px;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 40%, var(--accent-soft), transparent 70%);
}
.library-book-slot { position: relative; min-width: 0; }
.book-display { position: relative; padding-bottom: 10px; margin-bottom: 16px; }
.book-display::after {
  content: ''; position: absolute; bottom: 0; left: -15px; right: -15px; height: 7px;
  background: linear-gradient(to bottom, var(--panel-2), var(--border));
  border-top: 1px solid var(--border-strong);
  box-shadow: 0 9px 12px -7px #29272540;
}
.library-book {
  --cover: #353230; --cover-ink: #FAF5ED; --cover-line: #BFB3A4;
  position: relative; display: block; width: calc(100% - 8px); aspect-ratio: .72;
  margin: 0 4px; padding: 0; text-align: left; font: inherit;
  border: 0; border-radius: 2px 6px 6px 2px; background: var(--cover); color: var(--cover-ink);
  cursor: pointer; perspective: 800px;
  box-shadow: 4px 3px 0 #E8E0D5, 6px 4px 0 #C8BFB4, 9px 12px 15px -8px #29272566;
  transform: perspective(800px) translateY(0) rotateX(var(--book-rx, 0deg)) rotateY(var(--book-ry, 0deg));
  transition: transform 240ms cubic-bezier(.2,.8,.2,1), box-shadow 240ms ease;
}
.cover-tone-1 { --cover: #DDD0BA; --cover-ink: #494139; --cover-line: #7D6B56; }
.cover-tone-2 { --cover: #9B5743; --cover-ink: #fff1dc; --cover-line: #dfb99a; }
.cover-tone-3 { --cover: #465563; --cover-ink: #F2F4F5; --cover-line: #B5C1CC; }
.book-face {
  position: absolute; inset: 0; display: flex; flex-direction: column; overflow: hidden;
  border-radius: inherit; padding: 17px 16px 15px 22px;
  background: linear-gradient(90deg, #0003, transparent 5%, #fff1 6%, transparent 9%),
    radial-gradient(ellipse at var(--book-light, 20%) 0%, #ffffff18, transparent 70%);
}
.book-face::before { content: ''; position: absolute; inset: 9px; border: 1px solid var(--cover-line); opacity: .25; pointer-events: none; }
.book-edition { display: flex; justify-content: space-between; gap: 8px; font-size: 9px; letter-spacing: .1em; opacity: .8; }
.book-cover-title {
  position: relative; z-index: 1; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 5;
  overflow: hidden; overflow-wrap: anywhere; font-size: 18px; font-weight: 500; line-height: 1.4;
  margin-top: 20px; letter-spacing: -.02em;
}
.book-cover-art { position: absolute; width: 130px; height: 130px; bottom: 34px; right: -25px; color: var(--cover-line); opacity: .42; }
.orbit { position: absolute; inset: 0; border: 1px solid currentColor; border-radius: 50%; }
.orbit-two { transform: translateX(-28px); }
.orbit-three { transform: translateY(28px); }
.cover-art-1 .orbit { border-radius: 0; transform: rotate(45deg); inset: 12px; }
.cover-art-1 .orbit-two { inset: 30px; }
.cover-art-1 .orbit-three { inset: 48px; }
.cover-art-2 .orbit { border-radius: 50% 50% 0 0; inset: 0 28px; }
.cover-art-2 .orbit-two { transform: translateX(-25px); }
.cover-art-2 .orbit-three { transform: translateX(25px); }
.book-colophon { display: flex; align-items: center; justify-content: space-between; gap: 4px; position: relative; z-index: 1; margin-top: auto; padding-top: 12px; font-size: 8px; letter-spacing: .08em; }
.book-open-mark { font-size: 18px; }
.book-info { padding: 0 4px; }
.book-filename { font-size: 12px; font-weight: 600; line-height: 1.6; overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 3.2em; }
.book-meta, .book-date { margin: 5px 0 0; color: var(--muted); font-size: 10px; line-height: 1.6; }
.book-actions { display: flex; align-items: center; justify-content: space-between;  margin-top: 8px; }
.book-status { color: var(--muted); font-size: 10px; }
.current .book-status { color: var(--accent); font-weight: 600; }
.current .library-book { outline: 2px solid var(--accent); outline-offset: 6px; }
.book-remove { padding: 7px 3px; min-height: 32px; background: none; border: none; color: var(--muted); font: inherit; font-size: 10px; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.book-remove:hover { color: var(--danger); }
.library-book:focus-visible, .book-remove:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
.bookshelf-dialog .library-usage { padding: 8px 0 16px; font-size: 11px; }
.bookshelf-dialog .library-backup { padding-top: 12px; }
.bookshelf-grid.is-empty { grid-template-columns: 1fr; }
.bookshelf-empty { text-align: center; padding: 30px 0 50px; }
.bookshelf-empty h3 { font-size: 19px; font-weight: 500; margin: 24px 0 10px; }
.bookshelf-empty p { font-size: 12px; color: var(--muted); line-height: 1.8; }
.empty-bookends { display: flex; align-items: flex-end; justify-content: center; gap: 5px; height: 70px; }
.empty-bookends span { width: 20px; height: 60px; background: var(--accent-soft); border: 1px solid var(--border-strong); border-radius: 3px; }
.empty-bookends span:nth-child(2) { height: 70px; }
.empty-bookends span:nth-child(3) { transform: rotate(15deg); transform-origin: bottom left; margin-left: 6px; }
@media (hover: hover) and (prefers-reduced-motion: no-preference) {
  .library-book:hover { transform: translateY(-2px); box-shadow: 4px 3px 0 #E8E0D5, 6px 4px 0 #C8BFB4, 12px 20px 22px -9px #29272566; }
}
@media (max-width: 850px) {
  .bookshelf-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .bookshelf-dialog .library-panel { padding: 28px 28px 18px; }
}
@media (max-width: 600px) {
  .bookshelf-dialog { width: calc(100vw - 20px); }
  .bookshelf-dialog .library-panel { padding: 24px 20px 16px; }
  .bookshelf-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 24px; padding: 26px 7px 20px; }
  .book-display::after { left: -12px; right: -12px; }
  .book-face { padding: 13px 12px 12px 18px; }
  .book-cover-title { font-size: 15px; margin-top: 15px; }
  .book-cover-title.book-long-title { font-size: 12px; }
  .book-edition { font-size: 8px; }
  .book-colophon { font-size: 7px; letter-spacing: 0; }
  .book-cover-art { width: 95px; height: 95px; opacity: .3; }
  .bookshelf-caption { font-size: 10px; gap: 8px; }
  .book-actions { flex-wrap: wrap; }
  .book-remove { min-height: 40px; padding: 8px 4px; }
}
@media (prefers-reduced-motion: reduce) {
  .library-book { transition: none; transform: none; }
}

/* ---------- 13. 記憶功能 ---------- */
.star-btn {
  flex: none;
  min-width: 38px;
  min-height: 38px;
  padding: 0 8px;
  font-size: 20px;
  line-height: 1;
  color: var(--accent);
}

.memory-filters {
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-end;
}

.memory-filters .field {
  margin: 0;
}

.memory-heading {
  margin: 14px 0 6px;
  font-size: 14px;
}

.memory-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.preference-preset-hint { margin: 0 0 10px; }
.preference-presets { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.preference-preset {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.preference-preset::before { content: '+'; width: 1em; text-align: center; }
.preference-preset[aria-pressed='true'] {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}
.preference-preset[aria-pressed='true']::before { content: '✓'; }
.preference-preset:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
@media (hover: hover) {
  .preference-preset:hover { background: var(--accent-soft); border-color: var(--accent); }
}

.memory-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease);
}

@media (hover: hover) {
  .memory-row:hover {
    background: var(--panel-2);
  }
}

.memory-row input[type='text'] {
  flex: 1 1 auto;
  min-width: 0;
  padding: 6px 8px;
  font-size: 13px;
}

.memory-add {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 0;
}

.memory-add input[type='text'] {
  flex: 1 1 auto;
  min-width: 0;
  padding: 6px 8px;
  font-size: 13px;
}

.mistake-row {
  align-items: flex-start;
}

.mistake-row.mastered {
  opacity: 0.65;
}

.mistake-thumb {
  flex: none;
  width: 72px;
  height: 96px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  background: var(--panel-2);
}

.mistake-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.mistake-summary {
  font-size: 13px;
  margin-top: 2px;
}

.mistake-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.mistake-tag {
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 6px;
  font-size: 11px;
}

#profile-dialog .library-panel {
  max-height: calc(100dvh - 24px);
  overflow-y: auto;
}

.sync-status {
  align-self: center;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.sync-status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-strong);
}

.sync-status[data-kind='synced']::before {
  background: var(--ok);
}

.sync-status[data-kind='syncing']::before,
.sync-status[data-kind='pending']::before {
  background: var(--accent);
}

.sync-status[data-kind='offline'] {
  color: var(--danger);
}

.sync-status[data-kind='offline']::before {
  background: var(--danger);
}

.sync-status[data-kind='error'] {
  color: var(--danger);
}

.sync-status[data-kind='error']::before {
  background: var(--danger);
}

.sync-status.can-retry {
  cursor: pointer;
  text-decoration: underline dotted;
}

.account-username {
  align-self: center;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- 14. 雲端登入 ---------- */
.cloud-login {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--backdrop);
  padding: 20px;
  margin: auto;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  border: 0;
}

.cloud-login:not([open]) {
  display: none !important;
}

.cloud-login-card {
  width: min(560px, calc(100vw - 24px));
  max-height: calc(100dvh - 24px);
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cloud-login-card h1 {
  margin: 0;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cloud-login-card .field,
.cloud-auth-form .field {
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
}

.cloud-login-error {
  margin: 0;
  color: var(--danger);
  font-size: 13px;
}

.cloud-auth-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---------- 15. 管理面板 ---------- */
.admin-panel {
  padding: 20px;
  max-height: calc(100dvh - 24px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.admin-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-head h2 {
  margin: 0;
  font-size: 18px;
}

.admin-section h3 {
  margin: 0 0 10px;
  font-size: 15px;
}

.admin-provider-source {
  margin: 0 0 10px;
}

.admin-provider-grid {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 10px;
}

.admin-provider-grid .field,
.admin-fallback-models .field,
.admin-invite-form .field {
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
}

.admin-provider-grid .field {
  min-width: 180px;
}

.admin-provider-grid .check {
  padding-bottom: 6px;
}

.admin-fallback-models {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

.admin-provider-error {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--danger);
}

.admin-users-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.admin-user-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  background: var(--panel);
}

.admin-user-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.admin-user-name {
  font-weight: 600;
}

.admin-user-meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 6px;
  font-size: 12px;
}

.admin-user-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
  align-items: center;
}

.admin-user-actions input[type="number"] {
  width: 90px;
}

.admin-invite-form {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.admin-invite-form .field {
  min-width: 120px;
}

.admin-invite-result {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 10px;
  background: var(--panel-2);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.admin-invite-code {
  font-family: var(--font-ui);
  font-size: 16px;
  font-weight: 600;
}

.admin-invites-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.admin-invite-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.admin-empty {
  color: var(--muted);
  font-size: 13px;
}

/* ---------- 16. 模型速度測試 ---------- */
.speedtest {
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}

.speedtest summary {
  cursor: pointer;
  font-weight: 600;
}

.speedtest-models {
  display: grid;
  gap: 2px;
  max-height: 180px;
  overflow-y: auto;
  margin: 8px 0;
}

.speedtest-models .check {
  font-size: 0.85em;
  overflow-wrap: anywhere;
}

.speedtest-results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85em;
  font-variant-numeric: tabular-nums;
}

.speedtest-results th,
.speedtest-results td {
  padding: 4px 6px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  overflow-wrap: anywhere;
}

.speedtest-results th {
  color: var(--muted);
  font-weight: 500;
}

.speedtest-results tr[data-kind="error"] td {
  color: var(--muted);
}

/* ---------- 17. 自訂下拉元件 ---------- */
.picker {
  position: relative;
  display: inline-flex;
  min-width: 0;
  font-size: 13px;
}

.field.grow .picker {
  flex: 1 1 auto;
}

.picker-source {
  position: absolute;
  width: 1px;
  height: 1px;
  min-height: 0;
  padding: 0;
  margin: -1px;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.picker-trigger {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-width: 7em;
  min-height: 36px;
  padding: 7px 12px;
  font: inherit;
  font-size: 13px;
  line-height: 1.4;
  color: var(--text);
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

.picker-trigger:hover:not(:disabled) {
  border-color: var(--accent);
}

.picker-trigger[aria-expanded='true'] {
  border-color: var(--accent);
}

.picker-trigger:disabled {
  color: var(--muted);
  background: var(--panel-2);
  border-color: var(--border);
  cursor: default;
  opacity: 0.8;
}

.picker-trigger-label {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.picker-arrow {
  flex: none;
  color: var(--muted);
  font-size: 10px;
}

.picker-trigger[aria-expanded='true'] .picker-arrow {
  transform: rotate(180deg);
}

.picker-panel {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 220px;
  max-width: min(360px, calc(100vw - 32px));
  max-height: 300px;
  overflow-y: auto;
  padding: 8px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.picker-head {
  padding: 0 8px 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}

.picker-search {
  width: 100%;
  margin-bottom: 4px;
  padding: 7px 10px;
  font: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.picker-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 0;
}

.picker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  line-height: 1.5;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

@media (hover: hover) {
  .picker-item:hover {
    background: var(--panel-2);
  }
}

.picker-item.is-selected {
  color: var(--text);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 600;
}

.picker-item.is-highlighted {
  background: var(--panel-2);
}

.picker-index {
  flex: none;
  min-width: 1.8em;
  text-align: center;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.picker-label {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.picker-check {
  flex: none;
  color: var(--accent);
  font-weight: 700;
  opacity: 0;
}
.picker-delete { flex: none; min-height: 32px; padding: 4px 7px; border: 0; border-radius: 5px; background: transparent; color: var(--muted); font: inherit; font-size: 11px; cursor: pointer; }
.picker-delete:hover { color: var(--danger, #b74738); background: var(--panel); }
.picker-delete:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (pointer: coarse) { .picker-delete { min-height: 44px; min-width: 44px; } }

.picker-item.is-selected .picker-check {
  opacity: 1;
}

.picker-empty {
  padding: 12px 8px;
  text-align: left;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 18. Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  font-size: 13px;
  padding: 9px 16px;
  border-radius: var(--radius);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
  z-index: 50;
  max-width: 80vw;
}

.toast.show {
  opacity: 1;
}

/* ---------- 儲存空間用量：依等級變色（顏色用主題變數，深色模式自動跟著換） ---------- */
.library-usage[data-level='warn'] {
  color: var(--accent);
  font-weight: 600;
}

.library-usage[data-level='critical'] {
  color: var(--danger);
  font-weight: 600;
}

.toast.has-action {
  display: flex;
  align-items: center;
  gap: 12px;
}
.toast.has-action.show { pointer-events: auto; }

.toast-action {
  background: none;
  border: 1px solid currentColor;
  border-radius: var(--radius-sm);
  color: inherit;
  font: inherit;
  padding: 3px 10px;
  cursor: pointer;
  white-space: nowrap;
}

.toast-action:hover {
  background: color-mix(in srgb, currentColor 15%, transparent);
}

/* ---------- 19. 鍵盤焦點 ---------- */
.btn:focus-visible,
.zoom button:focus-visible,
.picker-trigger:focus-visible,
.library-row:focus-visible,
.link-btn:focus-visible,
.pane-splitter:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.topbar-menu button:focus-visible,
.check input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

select:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: none;
}

/* ---------- 20. 動畫 ---------- */
@keyframes fade-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes soft-blink {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

dialog.settings[open],
dialog.library[open],
dialog.admin-dialog[open] {
  animation: fade-in var(--dur) var(--ease);
}

.picker-panel:not([hidden]) {
  animation: fade-in var(--dur-fast) var(--ease);
}

}