:root {
  color-scheme: light;
  --bg: #fff;
  --surface: #fff;
  --ink: #1c2430;
  --muted: #5c6b7a;
  --line: #e3ebf4;
  --line-blue: #c9daf0;
  --blue: #1d6fe8;
  --blue-deep: #1558b8;
  --blue-ink: #1558b8;
  --blue-soft: #e8f2fd;
  --red: #e23b3b;
  --red-soft: #fdecec;
  --amber: #b26a00;
  --amber-soft: #fdf3e1;
  --font: "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", system-ui, sans-serif;
  --pad-x: max(24px, env(safe-area-inset-right, 0px));
  --pad-b: env(safe-area-inset-bottom, 0px);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10161e;
  --surface: #1a2330;
  --ink: #e8eef6;
  --muted: #93a4b8;
  --line: #2a3848;
  --line-blue: #2f4d73;
  --blue: #4c94f5;
  --blue-deep: #3b7fe0;
  --blue-ink: #9ec4ff;
  --blue-soft: #1c334f;
  --red: #ff7070;
  --red-soft: #3d2426;
  --amber: #f0b44c;
  --amber-soft: #3a2d17;
}

* { box-sizing: border-box; }

html { height: 100%; }

body {
  margin: 0;
  height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  padding: 0 var(--pad-x) 0 max(24px, env(safe-area-inset-left, 0px));
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

button:focus-visible,
textarea:focus-visible,
.mk:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 15;
  flex: none;
  margin-left: calc(max(24px, env(safe-area-inset-left, 0px)) * -1);
  margin-right: calc(var(--pad-x) * -1);
  padding: env(safe-area-inset-top, 0px) var(--pad-x) 0 max(24px, env(safe-area-inset-left, 0px));
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: 40rem;
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
}

.wrap {
  max-width: 40rem;
  width: 100%;
  margin: 0 auto;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-top: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.logo {
  width: 26px;
  height: 26px;
  flex: none;
  display: block;
  color: var(--blue);
  fill: currentColor;
}

.nav-actions {
  position: relative;
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme,
.help-btn {
  flex: none;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line-blue);
  border-radius: 8px;
  background: var(--surface);
  color: var(--blue-ink);
}

.theme:hover,
.help-btn:hover,
.help-btn[aria-expanded="true"] { border-color: var(--blue); background: var(--blue-soft); }
.help-btn { font-size: 1.1rem; font-weight: 700; line-height: 1; }
.theme .icon-sun { display: none; }
html[data-theme="dark"] .theme .icon-moon { display: none; }
html[data-theme="dark"] .theme .icon-sun { display: block; }

h1 {
  margin: 0;
  color: var(--blue);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .04em;
}

.grid {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  gap: 16px;
}

.pane {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.views,
.list-pane {
  min-height: 0;
  overflow: hidden;
}

/* 分類按鈕和修正清單一起捲動 */
.list-pane { overflow-y: auto; overscroll-behavior: contain; }

.views { flex: 3 1 0; }
.list-pane { flex: 2 1 0; gap: 16px; }

.pane-head,
.check-btn,
.filters { flex: none; }

.pane-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.views .pane-head {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

.views .tools {
  margin-left: auto;
  justify-content: flex-end;
}

.help-panel h3 {
  margin: 16px 0;
  color: var(--blue);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
}

.tabs {
  display: flex;
  align-self: flex-start;
}

.tab {
  height: 40px;
  border: 1px solid var(--line-blue);
  background: var(--surface);
  color: var(--blue-ink);
  padding: 0 16px;
  font-size: .92rem;
  font-weight: 600;
  line-height: 1;
}

.tab:first-child { border-radius: 8px 0 0 8px; }
.tab:last-child { border-radius: 0 8px 8px 0; }
.tab + .tab { margin-left: -1px; }

.tab[aria-selected="true"] {
  position: relative;
  z-index: 1;
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.tools,
.filters { display: flex; gap: 8px; flex-wrap: wrap; }

.btn {
  height: 40px;
  border: 1px solid var(--line-blue);
  border-radius: 8px;
  background: var(--surface);
  color: var(--blue-ink);
  padding: 0 16px;
  font-size: .86rem;
  line-height: 1;
}

.btn:hover { border-color: var(--blue); background: var(--blue-soft); }
.btn.danger { border-color: #e23b3b; background: #e23b3b; color: #fff; }
.btn.danger:hover { border-color: #c92f2f; background: #c92f2f; }

.btn.primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
  font-weight: 700;
}

.btn.primary:hover { border-color: var(--blue-deep); background: var(--blue-deep); }

.btn:disabled {
  cursor: default;
  opacity: .45;
}

.btn.primary:disabled:hover {
  border-color: var(--blue);
  background: var(--blue);
}

.btn.primary.is-busy:disabled {
  opacity: 1;
  cursor: wait;
}

.check-btn {
  width: 100%;
  height: 44px;
  font-size: .95rem;
}

.spinner {
  width: 14px;
  height: 14px;
  flex: none;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

.loading-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 160px;
  border: 1px dashed var(--line-blue);
  border-radius: 8px;
  background: var(--blue-soft);
  color: var(--blue-ink);
  font-size: .95rem;
  font-weight: 600;
}

.loading-card .spinner {
  width: 28px;
  height: 28px;
  border-width: 3px;
  border-color: var(--line-blue);
  border-top-color: var(--blue);
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation: pulse 1.2s ease-in-out infinite; }
  .loading-card .spinner { border-top-color: var(--blue); }
}

@keyframes pulse {
  50% { opacity: .35; }
}

.view-stack {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  margin-top: 8px;
}
.panel { flex: 1; min-height: 0; height: 100%; }

textarea {
  width: 100%;
  height: 100%;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.85;
  padding: 16px 16px 40px;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  overflow-anchor: none;
  resize: none;
  min-height: 0;
}

textarea:focus { border-color: var(--blue); outline: none; box-shadow: 0 0 0 3px rgba(29, 111, 232, .16); }

.out-box { position: relative; height: 100%; min-height: 0; }
.out-hl {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  overflow: hidden;
  margin: 0;
  pointer-events: none;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.85;
  padding: 16px 16px 40px;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}
.out-hl .fixed { color: var(--red); }
.out-hl mark.flash {
  background: #ffe56a;
  color: inherit;
  padding: 0;
  border-radius: 2px;
  transition: background-color 1s ease;
}
html[data-theme="dark"] .out-hl mark.flash { background: rgba(255, 214, 64, .45); }
.out-hl mark.flash.off,
html[data-theme="dark"] .out-hl mark.flash.off { background: transparent; }
.out-box textarea {
  position: relative;
  z-index: 1;
  color: transparent;
  -webkit-text-fill-color: transparent;
  caret-color: var(--ink);
  background: transparent;
}
.out-box textarea::placeholder {
  color: var(--muted);
  -webkit-text-fill-color: var(--muted);
  opacity: 1;
}
.out-box textarea::selection {
  background: rgba(29, 111, 232, .22);
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.meta,
.chip b { font-variant-numeric: tabular-nums; }
.meta.over { color: var(--red); font-weight: 700; }
.meta {
  position: absolute;
  right: 16px;
  bottom: 8px;
  z-index: 2;
  margin: 0;
  padding: 0 8px;
  pointer-events: none;
  font-size: .82rem;
  line-height: 1.4;
  color: var(--muted);
  background: var(--surface);
}

.mirror {
  position: fixed;
  left: -10000px;
  top: 0;
  visibility: hidden;
  pointer-events: none;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.mk {
  display: inline;
  position: relative;
  white-space: nowrap;
}

.mk .note {
  position: absolute;
  left: 50%;
  bottom: calc(100% + .06em);
  transform: translateX(-50%);
  font-size: calc(.75em - 1pt);
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}
.mk.fix .note,
.mk.fix .bad { color: var(--red); }
.mk.del .note,
.mk.del .bad { color: var(--blue); }
.mk.del .bad { text-decoration: line-through; text-decoration-thickness: 2px; }
.mk.fix.on { background: var(--red-soft); }
.mk.sug .note,
.mk.sug .bad { color: var(--amber); }
.mk.sug.on { background: var(--amber-soft); }
.mk.del.on { background: var(--blue-soft); }

.chip {
  display: inline-flex;
  align-items: center;
  height: 32px;
  gap: 6px;
  border: 1px solid var(--line-blue);
  border-radius: 8px;
  background: var(--surface);
  color: var(--blue-ink);
  padding: 0 12px;
  font-size: .8rem;
  line-height: 1;
}

.chip:hover { border-color: var(--blue); background: var(--blue-soft); }
.chip b { font-weight: 700; }
.chip[aria-pressed="true"],
.chip[aria-pressed="true"]:hover { background: var(--blue); border-color: var(--blue); color: #fff; }

.issues {
  list-style: none;
  margin: 0;
  padding: 0 0 24px;
  display: flex;
  flex-direction: column;
  flex: none;
  gap: 8px;
}

body.has-top .issues { padding-bottom: 80px; }

.card {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border: 1px solid var(--line);
  border-left: 4px solid var(--red);
  border-radius: 8px;
  background: var(--surface);
  padding: 16px;
}

.card.del { border-left-color: var(--blue); }
.card.sug { border-left-color: var(--amber); }
.card.on {
  border: 2px solid var(--blue);
  box-shadow: none;
}
.card .revert { flex: none; }
.ctx { flex: 1; min-width: 0; margin: 0; padding-top: 16px; font-size: 1.02rem; line-height: 1.35; word-break: break-word; }
.none { border: 1px dashed var(--line); border-radius: 8px; padding: 16px; color: var(--muted); font-size: .9rem; }

.top-btn {
  position: fixed;
  right: var(--pad-x);
  bottom: calc(24px + var(--pad-b));
  z-index: 30;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--blue);
  box-shadow: 0 6px 18px rgba(28, 36, 48, .12);
}

.top-btn:hover { border-color: var(--blue); background: var(--blue-soft); }
/* 用滑鼠或手指點不顯示外框；用鍵盤 Tab 選到時才顯示 */
.top-btn { -webkit-tap-highlight-color: transparent; }
.top-btn:focus:not(:focus-visible) { outline: none; }

.help-panel {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  z-index: 30;
  width: min(26rem, calc(100vw - 48px));
  max-height: min(70vh, 640px);
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 12px 40px rgba(28, 36, 48, .12);
}

.help-block + .help-block { margin-top: 8px; padding-top: 8px; }

.table-wrap { overflow-x: auto; }

table { border-collapse: collapse; width: 100%; font-size: .9rem; }

th,
td {
  text-align: left;
  padding: 16px 8px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
  line-height: 1.6;
}

thead th { padding-top: 0; color: var(--muted); font-size: .78rem; font-weight: 500; }
td.k { width: 2.4em; color: var(--blue); font-size: 1.15rem; font-weight: 700; }
.help-panel tr:last-child td,
.help-panel li:last-child { border-bottom: 0; }

.help-panel ul { margin: 0; padding: 0; list-style: none; color: var(--ink); font-size: .9rem; }

.help-panel li {
  position: relative;
  padding: 16px 0 16px 16px;
  border-bottom: 1px solid var(--line);
  line-height: 1.6;
}

.help-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
  transform: translateY(-50%);
}

.toast {
  position: fixed;
  left: max(16px, env(safe-area-inset-left, 0px));
  bottom: calc(24px + var(--pad-b));
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: calc(100vw - 96px);
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--blue-deep);
  color: #fff;
  font-size: .9rem;
}

.confirm {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(16, 22, 30, .45);
}

.confirm-card {
  width: min(22rem, 100%);
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 16px 48px rgba(16, 22, 30, .22);
}

.confirm-card h2 { margin: 0; font-size: 1.05rem; font-weight: 650; }
.confirm-card p { margin: 8px 0 0; color: var(--muted); font-size: .92rem; line-height: 1.6; }

.confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

.panel[hidden],
.check-btn[hidden],
.top-btn[hidden],
.help-panel[hidden],
.toast[hidden],
.confirm[hidden] { display: none !important; }

@media (prefers-reduced-motion: no-preference) {
  .card,
  .chip,
  .btn { transition: box-shadow .15s, border-color .15s, background-color .15s; }
}