:root {
  color-scheme: light;
  --paper: #edf1ed;
  --surface: #fafbf7;
  --ink: #243d50;
  --celadon: #dce6e1;
  --seal: #a33027;
  --muted: #50616a;
  --body: "Microsoft JhengHei", "微軟正黑體", "PingFang TC", sans-serif;
  --title: "PMingLiU", "新細明體", "Songti TC", serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: 1rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 1rem/1.8 var(--body); overflow-wrap: anywhere; }
h1, h2, h3, p { margin: 0 0 .7rem; }
h1, h2, h3 { font-family: var(--title); line-height: 1.4; }
h1 { font-size: clamp(1.5rem, 3vw, 2rem); }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.2rem; }
a { color: var(--ink); text-underline-offset: .22em; }
a:hover { color: var(--seal); }
button, input, summary { font: inherit; }
button, summary { cursor: pointer; }
button { border: 1px solid var(--ink); color: var(--ink); background: var(--surface); padding: .45rem .75rem; min-height: 44px; }
button:hover { background: var(--celadon); }
button:disabled { opacity: .5; cursor: default; }
:focus-visible { outline: 3px solid var(--seal); outline-offset: 3px; }
.skip-link { position: fixed; top: -10rem; left: 1rem; z-index: 50; background: var(--surface); padding: .6rem; }
.skip-link:focus { top: .5rem; }
.masthead { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 1.4rem clamp(1rem, 4vw, 3.5rem); background: var(--ink); color: var(--surface); }
.masthead p { margin: 0; }
.masthead a { color: var(--surface); }
.layout { max-width: 88rem; margin: auto; display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 4rem); padding: 2rem clamp(1rem, 4vw, 3.5rem); align-items: start; }
.sidebar { min-width: 0; position: sticky; top: 1rem; max-height: calc(100dvh - 2rem); overflow: auto; scrollbar-gutter: stable; }
.sidebar summary { font-weight: bold; padding: .6rem 0; }
.sidebar nav { margin: 1rem 0 1.8rem; }
.sidebar h2, .sidebar h3 { font-size: 1.05rem; margin: .8rem 0 .3rem; }
.sidebar ol { padding-left: 1.5rem; margin: .3rem 0; }
.sidebar a { display: inline-block; padding: .35rem 0; }
main { min-width: 0; max-width: 54rem; width: 100%; }
.search-area { margin-bottom: 1.7rem; }
.search-area label { display: block; margin-bottom: .4rem; font-weight: bold; }
input { width: 100%; min-width: 0; border: 1px solid var(--muted); border-radius: 0; padding: .65rem .8rem; background: var(--surface); color: var(--ink); }
.muted { color: var(--muted); }
#search-status { min-height: 1.8em; margin-top: .35rem; }
.notice { padding: 1.4rem; background: var(--celadon); border-left: 4px solid var(--seal); }
.notice p:last-child { margin-bottom: 0; }
.chapter { margin: 0 0 3rem; scroll-margin-top: 1rem; }
.chapter-heading { display: flex; align-items: baseline; gap: .75rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.chapter-heading h2 { margin: 0; }
.chapter-number { color: var(--seal); font-variant-numeric: tabular-nums; }
.steps { list-style: none; padding: 0; margin: 0; counter-reset: none; }
.step { background: var(--surface); position: relative; padding: 1.2rem; margin-bottom: 2.4rem; border-left: 3px solid var(--ink); }
.step:not(:last-child)::after { content: "↓"; position: absolute; bottom: -2.2rem; left: 1.1rem; font-size: 1.4rem; color: var(--muted); }
.step-header { display: flex; justify-content: space-between; gap: .75rem; align-items: baseline; flex-wrap: wrap; }
.step h3 { margin-bottom: .45rem; }
.step-order { color: var(--muted); font-size: .95rem; }
.story-trigger { display: block; width: 100%; text-align: left; padding: .6rem 0; border: 0; background: transparent; }
.story-trigger::after { content: ""; position: absolute; inset: 0; }
.story-trigger:hover { background: var(--paper); }
.action { font-size: 1.15rem; font-weight: bold; display: block; }
.read-hint { color: var(--muted); font-size: .9rem; }
.tips { margin: .6rem 0 1rem; padding-left: 1.4rem; }
.status { font-size: .9rem; padding: .1rem .5rem; background: var(--celadon); }
.status.partial, .status.unmatched, .conflict { color: var(--seal); }
.map-controls { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; position: relative; z-index: 1; }
.no-map { color: var(--muted); font-size: .95rem; }
#supplements > article, #source-index { margin-top: 2rem; }
.coverage-note { margin-bottom: 2rem; }
#source-index ul { padding-left: 1.4rem; }
footer { padding: 1.5rem; text-align: center; color: var(--muted); font-size: .9rem; }
.preview { position: fixed; z-index: 10; width: min(32rem, calc(100vw - 2rem)); max-height: min(70dvh, 38rem); overflow: hidden; background: var(--surface); border: 2px solid var(--ink); box-shadow: 0 .6rem 2rem #243d5030; display: flex; flex-direction: column; }
.preview-bar, .reader-bar { display: flex; align-items: center; gap: .5rem; padding: .65rem 1rem; background: var(--celadon); flex-shrink: 0; }
.preview-bar strong { margin-right: auto; }
.reader-bar h2 { margin: 0 auto 0 0; font-size: 1.2rem; }
.reading-body { overflow: auto; overscroll-behavior: contain; padding: 1.25rem; min-height: 0; line-height: 1.95; }
.reading-body img, #supplements img { display: block; max-width: 100%; height: auto; image-rendering: pixelated; }
.reading-body figure, #supplements figure { min-width: 0; margin: 1rem 0; }
.reading-body figcaption, #supplements figcaption { color: var(--muted); font-size: .9rem; }
.reading-body table, #supplements table { display: block; max-width: 100%; overflow: auto; border-collapse: collapse; }
.reading-body th, .reading-body td, #supplements th, #supplements td { border: 1px solid var(--muted); padding: .3rem; }
.reading-body pre, #supplements pre { max-width: 100%; overflow: auto; white-space: pre; overflow-wrap: normal; }
.reading-body article, #supplements article { min-width: 0; }
.image-trigger { display: block; max-width: 100%; padding: .25rem; cursor: zoom-in; }
.reading-body ul, .reading-body ol { padding-left: 1.4rem; }
.reading-body .conflicts { padding: 1rem; background: var(--paper); border-left: 3px solid var(--seal); margin: 1rem 0; }
.reading-body a { overflow-wrap: anywhere; }
.missing-image { padding: .8rem; background: var(--celadon); }
dialog { width: min(52rem, calc(100vw - 2rem)); max-width: calc(100vw - 2rem); height: min(90dvh, 54rem); max-height: 90dvh; padding: 0; border: 2px solid var(--ink); background: var(--surface); color: var(--ink); }
dialog[open] { display: flex; flex-direction: column; }
dialog::backdrop { background: #182b3dc4; }
body.reader-open { overflow: hidden; }
.gallery-controls { display: flex; flex-wrap: wrap; align-items: center; gap: .45rem; margin: .5rem 0; }
.image-viewport { max-width: 100%; max-height: 55dvh; overflow: auto; touch-action: pan-x pan-y pinch-zoom; background: var(--paper); }
.image-viewport img { max-width: none; width: 100%; }
.gallery-caption { margin: .5rem 0; }
@media (max-width: 767px) {
  .masthead { padding: 1rem; flex-wrap: wrap; }
  .masthead a { font-size: .95rem; }
  .layout { grid-template-columns: minmax(0, 1fr); gap: 1rem; padding: 1rem; }
  .sidebar { position: static; max-height: none; background: var(--celadon); padding: .4rem 1rem; }
  .sidebar details[open] nav { max-height: none; }
  .step { padding: 1rem; }
  .reading-body { padding: 1rem; }
  .preview-bar, .reader-bar { flex-wrap: wrap; padding: .5rem; }
  dialog { width: calc(100vw - 1rem); max-width: calc(100vw - 1rem); height: 94dvh; max-height: 94dvh; }
}
@media (prefers-reduced-motion: no-preference) {
  button { transition: background-color .12s; }
}