/* openjre.aitutor.ink — data page styles
   Mobile-first. High contrast. No floating controls. */

:root {
  --bg: #f7f5f0;
  --surface: #ffffff;
  --surface-2: #f1eee7;
  --ink: #12161c;
  --ink-2: #39424f;
  --ink-3: #5b6573;
  --line: #d9d4c9;
  --line-strong: #b9b2a4;
  --accent: #0b5d4e;
  --accent-ink: #ffffff;
  --accent-soft: #e4f1ec;
  --warn: #7a4200;
  --warn-soft: #fdf0dc;
  --warn-line: #e0b878;
  --danger: #9c1c1c;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(18, 22, 28, .06), 0 8px 24px -18px rgba(18, 22, 28, .5);
  --serif: Georgia, "Noto Serif TC", "Songti TC", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans TC",
          "PingFang TC", "Microsoft JhengHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #151b23;
    --surface-2: #1b222c;
    --ink: #eef2f7;
    --ink-2: #c6cfdb;
    --ink-3: #9aa5b4;
    --line: #2b3542;
    --line-strong: #3d4a5a;
    --accent: #4fd1b5;
    --accent-ink: #06231d;
    --accent-soft: #10312b;
    --warn: #f2bd7c;
    --warn-soft: #2a2113;
    --warn-line: #6b5227;
    --danger: #ff8f8f;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 10px 30px -20px rgba(0, 0, 0, .9);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* Content container: always >= 70% of the viewport width. */
.wrap {
  width: 94%;
  max-width: 2100px;
  margin-inline: auto;
}

@media (min-width: 2200px) {
  .wrap { width: 96%; }
}

a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-ink);
  padding: .6rem 1rem; z-index: 50; border-radius: 0 0 var(--radius-sm) 0;
}
.skip:focus { left: 0; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: .75rem; padding: .6rem 0; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: .55rem;
  text-decoration: none; color: var(--ink); font-family: var(--serif);
  font-size: 1.02rem; letter-spacing: .01em;
}
.brand-mark {
  display: inline-grid; place-items: center;
  width: 2rem; height: 2rem; border-radius: 8px;
  background: var(--accent); color: var(--accent-ink);
  font-size: .72rem; font-weight: 700; letter-spacing: .04em;
  font-family: var(--sans);
}
.brand-text em { font-style: normal; color: var(--ink-3); }
.header-actions { display: flex; align-items: center; gap: .5rem; }

.btn {
  font: inherit; font-size: .86rem; line-height: 1;
  padding: .55rem .8rem; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.lang-switch {
  display: inline-flex; border: 1px solid var(--line-strong);
  border-radius: 999px; overflow: hidden; background: var(--surface);
}
.lang-btn {
  font: inherit; font-size: .86rem; line-height: 1;
  padding: .55rem .75rem; border: 0; background: transparent;
  color: var(--ink-2); cursor: pointer;
}
.lang-btn[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.lang-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ---------- layout ---------- */
main { padding: 1.5rem 0 3rem; }
.loading { color: var(--ink-3); padding: 2rem 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1.1rem;
  overflow: clip;
  scroll-margin-top: 4.5rem;
}

.card > summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: baseline; gap: .75rem; flex-wrap: wrap;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid transparent;
}
.card[open] > summary { border-bottom-color: var(--line); }
.card > summary::-webkit-details-marker { display: none; }
.card > summary::after {
  content: "−"; margin-left: auto; color: var(--ink-3);
  font-size: 1.1rem; line-height: 1;
}
.card:not([open]) > summary::after { content: "+"; }
.card > summary:hover { background: var(--surface-2); }
.card > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: -3px; }

.card h2 {
  margin: 0; font-family: var(--serif); font-weight: 600;
  font-size: clamp(1.12rem, 1.6vw, 1.4rem); letter-spacing: .005em;
}
.card-num {
  font-family: var(--mono); font-size: .74rem; color: var(--ink-3);
  border: 1px solid var(--line); border-radius: 6px; padding: .1rem .38rem;
}
.card-body { padding: 1.15rem; }
.card-body > :first-child { margin-top: 0; }
.card-body > :last-child { margin-bottom: 0; }

.prose { max-width: 82ch; }
.prose p { margin: 0 0 .85rem; }
.muted { color: var(--ink-3); }
.small { font-size: .88rem; }

/* ---------- source badge ---------- */
.source-badge {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .76rem; line-height: 1.3; color: var(--ink-3);
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: 999px; padding: .22rem .6rem;
  text-decoration: none; white-space: nowrap;
}
.source-badge:hover { color: var(--accent); border-color: var(--accent); }
.source-badge .dot { opacity: .5; }
.section-source { margin-top: 1.1rem; padding-top: .9rem; border-top: 1px dashed var(--line); }

/* ---------- hero ---------- */
.hero { border-left: 5px solid var(--accent); }
.hero h1 {
  font-family: var(--serif); font-weight: 600; margin: 0 0 .35rem;
  font-size: clamp(1.45rem, 2.6vw, 2.05rem); line-height: 1.18;
  letter-spacing: -.005em;
}
.hero .official-title {
  margin: 0 0 .9rem; color: var(--ink-3); font-size: .9rem;
  line-height: 1.45; max-width: 95ch;
}
.hero .lede {
  color: var(--ink-2); max-width: 78ch; margin: 0 0 1.2rem;
  font-family: var(--mono); font-size: .88rem; letter-spacing: .01em;
}

.status-strip {
  display: grid; gap: .7rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  margin: 0 0 1.1rem;
}
.status-cell {
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: .8rem .9rem;
}
.status-cell .k {
  display: block; font-size: .72rem; letter-spacing: .07em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: .3rem;
}
.status-cell .v {
  display: block; font-family: var(--serif); font-size: 1.18rem;
  line-height: 1.25; color: var(--ink);
}
.status-cell .sub { display: block; font-size: .8rem; color: var(--ink-3); margin-top: .25rem; }
.status-cell.is-closed { border-color: var(--warn-line); background: var(--warn-soft); }
.status-cell.is-closed .v { color: var(--warn); }

/* ---------- two-column compare ---------- */
.compare {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}
.panel {
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 1rem; background: var(--surface-2);
}
.panel h3 {
  margin: 0 0 .2rem; font-family: var(--serif); font-size: 1.05rem;
}
.panel .tag {
  display: inline-block; font-size: .72rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--accent);
  background: var(--accent-soft); border-radius: 999px;
  padding: .12rem .5rem; margin-bottom: .6rem;
}
.panel p { margin: 0 0 .7rem; }
.panel p:last-child { margin-bottom: 0; }

/* ---------- verbatim sample ---------- */
.sample {
  border: 1px solid var(--line); border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm); background: var(--surface-2);
  padding: 1rem 1.1rem; margin: 0 0 1rem;
}
.sample-head {
  display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap;
  margin-bottom: .6rem;
}
.sample-head h3 { margin: 0; font-family: var(--serif); font-size: 1.02rem; }
.sample-text {
  font-family: var(--serif); font-size: 1.02rem; line-height: 1.75;
  white-space: pre-wrap; margin: 0;
}
.sample-text[lang="zh-Hant"] { font-family: var(--serif); letter-spacing: .01em; }

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: .94rem; }
caption { text-align: left; color: var(--ink-3); font-size: .84rem; padding-bottom: .5rem; }
th, td {
  text-align: left; vertical-align: top;
  padding: .6rem .7rem; border-bottom: 1px solid var(--line);
}
thead th {
  font-size: .74rem; letter-spacing: .06em; text-transform: uppercase;
  color: var(--ink-3); border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--surface-2); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.post-name { font-weight: 600; }
.post-name .code { color: var(--ink-3); font-weight: 400; font-size: .82rem; display: block; }
.req-list { margin: .2rem 0 0; padding-left: 1.1rem; }
.req-list li { margin-bottom: .3rem; }
.req-list li:last-child { margin-bottom: 0; }

@media (max-width: 860px) {
  .posts-table thead { display: none; }
  .posts-table, .posts-table tbody, .posts-table tr, .posts-table td { display: block; width: 100%; }
  .posts-table tr {
    border: 1px solid var(--line); border-radius: var(--radius-sm);
    margin-bottom: .8rem; padding: .5rem .8rem; background: var(--surface);
  }
  .posts-table td { border: 0; padding: .45rem 0; }
  .posts-table td + td { border-top: 1px dashed var(--line); }
  .posts-table td::before {
    content: attr(data-label); display: block;
    font-size: .7rem; letter-spacing: .07em; text-transform: uppercase;
    color: var(--ink-3); margin-bottom: .15rem;
  }
  .posts-table td.num { text-align: left; }
}

/* ---------- lists ---------- */
.checklist { list-style: none; margin: 0; padding: 0; display: grid; gap: .7rem; }
.checklist li {
  display: grid; grid-template-columns: 1.6rem 1fr; gap: .6rem;
  align-items: start;
}
.checklist .mark {
  display: grid; place-items: center; width: 1.5rem; height: 1.5rem;
  border-radius: 50%; background: var(--accent-soft); color: var(--accent);
  font-size: .8rem; font-weight: 700; margin-top: .15rem;
}
.checklist .req { font-weight: 600; margin: 0 0 .15rem; }
.checklist .where { margin: 0; color: var(--ink-2); font-size: .92rem; }
.checklist .validity { margin: .2rem 0 0; color: var(--ink-3); font-size: .84rem; }

.equiv { margin: .9rem 0 0; padding: 0; list-style: none; display: grid; gap: .5rem; }
.equiv li {
  border-left: 3px solid var(--line-strong); padding: .1rem 0 .1rem .75rem;
  font-size: .92rem; color: var(--ink-2);
}
.equiv .lvl {
  display: inline-block; font-size: .7rem; letter-spacing: .05em;
  text-transform: uppercase; color: var(--accent); background: var(--accent-soft);
  border-radius: 999px; padding: .05rem .45rem; margin-right: .4rem;
}

/* ---------- callout ---------- */
.callout {
  border: 1px solid var(--warn-line); background: var(--warn-soft);
  border-radius: var(--radius-sm); padding: .9rem 1rem; margin: 1rem 0 0;
}
.callout h3 { margin: 0 0 .4rem; font-family: var(--serif); font-size: 1rem; color: var(--warn); }
.callout p { margin: 0 0 .6rem; }
.callout p:last-child { margin-bottom: 0; }

.worked {
  display: grid; gap: .5rem; margin: .9rem 0 0;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.worked .step {
  background: var(--surface); border: 1px solid var(--warn-line);
  border-radius: var(--radius-sm); padding: .6rem .7rem;
}
.worked .step .k {
  display: block; font-size: .7rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--ink-3);
}
.worked .step .v {
  display: block; font-family: var(--mono); font-size: .95rem; margin-top: .15rem;
}
.worked .step.is-fail { border-color: var(--danger); }
.worked .step.is-fail .v { color: var(--danger); }

/* ---------- timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before {
  content: ""; position: absolute; left: .42rem; top: .5rem; bottom: .5rem;
  width: 2px; background: var(--line);
}
.timeline li { position: relative; padding: 0 0 1.1rem 1.7rem; }
.timeline li:last-child { padding-bottom: 0; }
.timeline .bullet {
  position: absolute; left: 0; top: .42rem; width: .9rem; height: .9rem;
  border-radius: 50%; background: var(--surface);
  border: 2px solid var(--accent);
}
.timeline li[data-certainty="tentative"] .bullet { border-color: var(--warn); border-style: dashed; }
.timeline li[data-certainty="unpublished"] .bullet { border-color: var(--line-strong); }
.timeline .when {
  font-family: var(--mono); font-size: .8rem; color: var(--ink-3);
  display: block; margin-bottom: .1rem;
}
.timeline .what { font-weight: 600; margin: 0 0 .15rem; }
.timeline .detail { margin: 0; color: var(--ink-2); font-size: .93rem; }
.timeline .flag {
  display: inline-block; font-size: .68rem; letter-spacing: .06em;
  text-transform: uppercase; border-radius: 999px; padding: .05rem .45rem;
  margin-left: .4rem; vertical-align: .1em;
  background: var(--surface-2); color: var(--ink-3); border: 1px solid var(--line);
}
.timeline .flag.tentative { background: var(--warn-soft); color: var(--warn); border-color: var(--warn-line); }

.centres { display: flex; flex-wrap: wrap; gap: .4rem; margin: .8rem 0 0; padding: 0; list-style: none; }
.centres li {
  font-size: .86rem; border: 1px solid var(--line); border-radius: 999px;
  padding: .18rem .65rem; background: var(--surface-2);
}

/* ---------- stats ---------- */
.stat-grid {
  display: grid; gap: .8rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin: 0 0 1.2rem;
}
.stat {
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: .85rem .95rem; background: var(--surface-2);
}
.stat .k { display: block; font-size: .78rem; color: var(--ink-3); margin-bottom: .25rem; }
.stat .v {
  display: block; font-family: var(--serif); font-size: 1.5rem; line-height: 1.15;
}
.stat .v.none { font-size: 1rem; color: var(--ink-3); font-family: var(--sans); }
.stat .note { display: block; font-size: .78rem; color: var(--ink-3); margin-top: .3rem; }

/* ---------- resources ---------- */
.res-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
.res-list li {
  display: grid; gap: .15rem .8rem;
  grid-template-columns: 3.2rem 1fr auto;
  align-items: baseline;
  border-bottom: 1px solid var(--line); padding-bottom: .55rem;
}
.res-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.res-list .rid { font-family: var(--mono); font-size: .76rem; color: var(--ink-3); }
.res-list .rdate { font-family: var(--mono); font-size: .76rem; color: var(--ink-3); white-space: nowrap; }
.res-list .rtype {
  font-size: .68rem; letter-spacing: .06em; text-transform: uppercase;
  color: var(--ink-3); border: 1px solid var(--line); border-radius: 4px;
  padding: 0 .3rem; margin-left: .4rem;
}
@media (max-width: 640px) {
  .res-list li { grid-template-columns: 3.2rem 1fr; }
  .res-list .rdate { grid-column: 2; }
}

/* ---------- cross links ---------- */
.xlinks {
  display: grid; gap: .8rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.xlink {
  display: block; text-decoration: none; color: inherit;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: .85rem .95rem; background: var(--surface-2);
}
.xlink:hover { border-color: var(--accent); }
.xlink .k {
  display: block; font-size: .72rem; letter-spacing: .07em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: .2rem;
}
.xlink .v { font-family: var(--serif); font-size: 1.02rem; color: var(--accent); word-break: break-word; }
.xlink .d { display: block; font-size: .84rem; color: var(--ink-3); margin-top: .2rem; }

/* ---------- notices ---------- */
.notice {
  border-radius: var(--radius-sm); padding: .8rem 1rem; margin: 1rem 0;
  border: 1px solid var(--line); background: var(--surface-2); font-size: .92rem;
}
.notice-error { border-color: var(--danger); color: var(--danger); }
.notice-stale { border-color: var(--warn-line); background: var(--warn-soft); color: var(--warn); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line); background: var(--surface);
  padding: 1.6rem 0 2.2rem; margin-top: 1rem;
}
.footer-inner {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}
.footer-title { font-family: var(--serif); margin: 0 0 .3rem; font-size: 1rem; }
.footer-note { margin: 0; color: var(--ink-3); font-size: .86rem; max-width: 70ch; }
.footer-meta { margin: 0; font-family: var(--mono); font-size: .8rem; color: var(--ink-3); }
.footer-meta a { color: var(--ink-3); }

/* ---------- print ---------- */
@media print {
  .site-header, .header-actions, .site-footer { display: none; }
  .card { break-inside: avoid; box-shadow: none; }
  .card > summary::after { content: ""; }
  body { background: #fff; color: #000; font-size: 11pt; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}