/* =========================================================================
   MetaCaster — project page
   Bone-paper ground, ink text, a single clay accent reserved for data.
   ========================================================================= */

:root {
  --paper:     #f6f5f1;
  --surface:   #fbfaf7;
  --plate:     #ffffff;
  --ink:       #191a1b;
  --ink-2:     #494c4f;
  --ink-3:     #82868b;
  --rule:      #e1dfd8;
  --rule-2:    #c9c6bd;
  --clay:      #c8102e;

  --serif: "Newsreader", Georgia, "Songti SC", "Noto Serif SC", "Times New Roman", serif;
  --sans:  "IBM Plex Sans", "Noto Sans SC", -apple-system, BlinkMacSystemFont,
           "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;

  --content: 1000px;
  --page:    1320px;
  --gutter:  40px;
}

:root[data-theme="dark"] {
  --paper:     #131416;
  --surface:   #1a1c1e;
  --plate:     #ffffff;
  --ink:       #e9e7e2;
  --ink-2:     #b0b3b6;
  --ink-3:     #7e8286;
  --rule:      #2a2d30;
  --rule-2:    #3d4145;
  --clay:      #ea6b80;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

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

a {
  color: var(--ink); text-decoration: underline;
  text-decoration-thickness: 1px; text-underline-offset: 3px;
  text-decoration-color: var(--rule-2);
}
a:hover { color: var(--clay); text-decoration-color: var(--clay); }
:focus-visible { outline: 2px solid var(--clay); outline-offset: 3px; }

h1, h2, h3 {
  margin: 0; font-family: var(--serif); font-weight: 400;
  line-height: 1.16; letter-spacing: -0.01em; text-wrap: balance;
}
p { margin: 0 0 1.05em; }
p:last-child { margin-bottom: 0; }

code {
  font-family: var(--sans); font-size: .95em; font-weight: 500;
  color: var(--ink-2);
}

sub, sup { font-size: .68em; line-height: 0; }

/* ------------------------------------------------------------------- nav */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s;
}
.nav[data-stuck="true"] { border-bottom-color: var(--rule); }
.nav-inner {
  max-width: var(--page); margin: 0 auto; padding: 0 var(--gutter);
  height: 56px; display: flex; align-items: center; gap: 30px;
}
.wordmark {
  font-family: var(--serif); font-size: 20px; letter-spacing: -0.015em;
  text-decoration: none; color: var(--ink);
}
.wordmark:hover { color: var(--ink); }
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-tools { display: flex; align-items: center; gap: 8px; margin-left: 22px; }
.nav-links a { font-size: 14.5px; color: var(--ink-3); text-decoration: none; }
.nav-links a:hover { color: var(--ink); }

.lang-btn {
  flex: none; cursor: pointer;
  background: none; border: 1px solid var(--rule-2); border-radius: 999px;
  padding: 4px 11px; font: inherit; font-size: 13px; color: var(--ink-3);
  transition: color .16s, border-color .16s;
}
.lang-btn:hover { color: var(--clay); border-color: var(--clay); }
.lang-zh { display: none; }
:root[data-lang="zh"] .lang-en { display: none; }
:root[data-lang="zh"] .lang-zh { display: inline; }

.theme-btn, .menu-btn {
  width: 30px; height: 30px; flex: none;
  display: grid; place-items: center; cursor: pointer;
  background: none; border: 0; padding: 0; color: var(--ink-3);
}
.theme-btn:hover, .menu-btn:hover { color: var(--clay); }
.theme-btn svg, .menu-btn svg { width: 17px; height: 17px; }
.menu-btn { display: none; }
.icon-close { display: none; }
.nav[data-menu="open"] .icon-bars { display: none; }
.nav[data-menu="open"] .icon-close { display: block; }
.icon-sun { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }

/* ------------------------------------------------------------------ hero */
/* The title block owns the first screen; everything else starts below it. */
.hero {
  max-width: 1000px; margin: 0 auto; padding: 48px var(--gutter);
  text-align: center;
  min-height: calc(100vh - 56px);
  min-height: calc(100svh - 56px);
  display: flex; flex-direction: column; justify-content: center;
}
.scroll-cue {
  margin: 46px auto 0; width: 34px; height: 34px;
  display: grid; place-items: center; color: var(--ink-3);
  border: 1px solid var(--rule-2); border-radius: 50%;
  transition: color .18s, border-color .18s;
}
.scroll-cue:hover { color: var(--clay); border-color: var(--clay); }
.scroll-cue svg { width: 15px; height: 15px; }

.tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 30px; }
.tag {
  font-size: 13px; line-height: 1; padding: 7px 13px;
  border: 1px solid var(--rule-2); border-radius: 999px; color: var(--ink-3);
}
.tag.accent { border-color: color-mix(in srgb, var(--clay) 45%, transparent); color: var(--clay); }

.hero h1 {
  font-size: clamp(3rem, 8vw, 4.6rem);
  line-height: 1.02; letter-spacing: -0.025em; margin-bottom: 20px;
}
.hero .standfirst {
  font-family: var(--serif); font-size: clamp(1.2rem, 2.6vw, 1.5rem);
  line-height: 1.42; color: var(--ink-2); text-wrap: balance;
  max-width: 46rem; margin: 0 auto 36px;
}

.hero .people { font-size: 16px; line-height: 2; max-width: 62ch; margin: 0 auto 6px; }
.hero .people sup { color: var(--clay); }
.hero .places {
  font-size: 14px; line-height: 1.8; color: var(--ink-3);
  max-width: 66ch; margin: 0 auto;
}
.hero .places sup { color: var(--clay); }

.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 15px; padding: 9px 18px;
  border: 1px solid var(--rule-2); border-radius: 999px;
  color: var(--ink); text-decoration: none; background: transparent;
  transition: border-color .18s, color .18s, background .18s;
}
.btn:hover { color: var(--clay); border-color: var(--clay); text-decoration: none; }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.primary:hover { background: var(--clay); border-color: var(--clay); color: #fff; }
.btn svg { width: 15px; height: 15px; opacity: .65; }
.btn:hover svg, .btn.primary svg { opacity: 1; }


/* ------------------------------------------------------------- structure */
.band { border-top: 1px solid var(--rule); }
.band-inner { max-width: var(--page); margin: 0 auto; padding: 76px var(--gutter); }
.band-label { font-size: 13.6px; color: var(--clay); margin-bottom: 12px; text-align: center; }
.band-body { min-width: 0; }
.band-body > * + * { margin-top: 34px; }

/* Headings sit centred like the title block; running text keeps a measured
   column, centred on the page rather than pinned to one edge. */
.band h2 { margin-inline: auto; text-align: center; }
.band h3.sub {
  font-size: clamp(1.25rem, 2.4vw, 1.5rem); max-width: var(--content);
  margin-inline: auto; text-align: center; color: var(--ink);
}
/* Prose, tables and figures all sit in the same measured column so their
   left and right edges line up down the page. */
.prose, .run-in, .note, .tablewrap, figure, .controls, .cite {
  max-width: var(--content); margin-inline: auto;
}

.band h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.3rem); max-width: var(--content);
  letter-spacing: -0.015em;
}
.prose { color: var(--ink-2); line-height: 1.72; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose .lead { font-size: 19px; line-height: 1.6; color: var(--ink); }

.run-in { color: var(--ink-2); line-height: 1.72; }
.run-in p { margin-bottom: 1.15em; }
.run-in p > b:first-child {
  font-family: var(--serif); font-size: 1.14em; font-weight: 500;
  color: var(--ink); letter-spacing: -0.005em;
}
.run-in p > b:first-child::after { content: " · "; color: var(--rule-2); font-family: var(--sans); }

/* --------------------------------------------------------------- figures */
figure { margin: 0 auto; }
.plate {
  background: var(--plate); border: 1px solid var(--rule); padding: 24px;
  display: flex; align-items: center; justify-content: center;
}
/* Cap the height so a near-square plot does not dominate the page at full width. */
.plate img { display: block; max-width: 100%; max-height: 620px; width: auto; height: auto; }
.pair {
  display: flex; gap: 18px; align-items: flex-start;
  max-width: var(--content); margin-inline: auto;
}
.pair figure { flex: var(--ar) 1 0; max-width: none; margin: 0; }
/* Percentage padding resolves against each plate's own width, so the plates
   stay in the same ratio as their figures and end up level. */
.pair .plate { padding: 1.7%; }
.pair .plate img { width: 100%; max-height: none; }
.pair figcaption { max-width: none; }

figcaption {
  margin: 14px auto 0; font-size: 14.4px; line-height: 1.55;
  color: var(--ink-3); max-width: 76ch; text-align: center;
}
figcaption b { color: var(--ink-2); font-weight: 600; }

/* ---------------------------------------------------------------- tables */
.tablewrap { overflow-x: auto; }
table.data {
  width: 100%; border-collapse: collapse;
  font-size: 14px; font-variant-numeric: tabular-nums lining-nums;
}
table.data th, table.data td { padding: 8px 11px; text-align: right; white-space: nowrap; }
table.data thead th {
  font-weight: 500; font-size: 13px; color: var(--ink-3);
  border-bottom: 1px solid var(--rule-2);
  position: sticky; top: 0; background: var(--paper); z-index: 2;
}
table.data thead tr.grp th {
  font-size: 12.4px; color: var(--ink-3); text-align: center;
  padding-bottom: 3px; border-bottom: 0; font-weight: 400;
}
table.data tbody tr + tr td { border-top: 1px solid var(--rule); }
table.data th.name, table.data td.name {
  text-align: left; position: sticky; left: 0; background: var(--paper);
  color: var(--ink); font-weight: 500;
}
table.data thead th.name { z-index: 3; }
table.data td.ours { background: color-mix(in srgb, var(--clay) 5%, transparent); }
table.data .sep { border-left: 1px solid var(--rule); }
table.data td.left, table.data th.left { text-align: left; }

td.best   { color: var(--clay); font-weight: 600; }
td.second { color: var(--ink); text-decoration: underline; text-decoration-color: var(--rule-2); text-underline-offset: 3px; }
td.ref    { color: var(--ink-3); font-style: italic; }
td.ref a  { color: inherit; text-decoration-color: var(--rule); }
td.ref a:hover { color: var(--clay); text-decoration-color: var(--clay); }

tr.section-row td {
  border-top: 1px solid var(--rule-2) !important;
  padding-top: 15px; padding-bottom: 5px;
  text-align: left; font-size: 13px; color: var(--ink-3); background: var(--paper);
}
tr.wins td { border-top: 1px solid var(--rule-2) !important; padding-top: 12px; color: var(--ink); font-weight: 500; }

.note { margin-top: 14px; font-size: 13.6px; line-height: 1.65; color: var(--ink-3); }
.note b { color: var(--ink-2); font-weight: 600; }

th.sortable { cursor: pointer; user-select: none; }
th.sortable:hover { color: var(--ink); }
th.sortable::after { content: "↕"; margin-left: 5px; font-size: 10px; opacity: .35; }
th.sortable[data-dir="asc"]::after  { content: "↑"; opacity: 1; color: var(--clay); }
th.sortable[data-dir="desc"]::after { content: "↓"; opacity: 1; color: var(--clay); }

/* -------------------------------------------------------------- controls */
.controls {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 12px 28px; margin-bottom: 20px; font-size: 14px;
  justify-content: center;
}
.ctl { display: flex; align-items: center; gap: 10px; }
.ctl-label { color: var(--ink-3); }
.choices { display: flex; flex-wrap: wrap; gap: 6px; }
.choices button {
  cursor: pointer; font: inherit; font-size: 13.4px; line-height: 1;
  padding: 7px 13px; border-radius: 999px;
  border: 1px solid var(--rule-2); background: transparent; color: var(--ink-3);
  transition: border-color .16s, color .16s, background .16s;
}
.choices button:hover { color: var(--ink); border-color: var(--ink-3); }
.choices button[aria-pressed="true"] {
  color: var(--clay); border-color: var(--clay);
  background: color-mix(in srgb, var(--clay) 7%, transparent);
}


/* Measured columns: the figure, then a slim meter reading left to right. */
table.data td.metric, table.data th.sortable { text-align: left; }
td.metric { min-width: 104px; }
td.metric .v { display: block; }
td.metric .track {
  display: block; height: 3px; margin-top: 6px; border-radius: 2px; overflow: hidden;
  background: color-mix(in srgb, var(--ink-3) 15%, transparent);
}
td.metric .track i {
  display: block; height: 100%; border-radius: 2px;
  background: color-mix(in srgb, var(--clay) 62%, transparent);
}
tbody tr:hover td.metric .track i { background: var(--clay); }

/* -------------------------------------------------------------- citation */
.cite { background: var(--surface); border: 1px solid var(--rule); overflow: hidden; min-width: 0; }
.cite-head {
  display: flex; align-items: center; padding: 9px 16px;
  border-bottom: 1px solid var(--rule); font-size: 13.4px; color: var(--ink-3);
}
.copy {
  margin-left: auto; border: 0; background: none; padding: 0; cursor: pointer;
  font: inherit; font-size: 13.4px; color: var(--ink-3);
  text-decoration: underline; text-decoration-color: var(--rule-2); text-underline-offset: 3px;
}
.copy:hover, .copy[data-done="true"] { color: var(--clay); }
pre {
  margin: 0; padding: 18px 22px; overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.7px; line-height: 1.8; color: var(--ink-2);
}

/* ---------------------------------------------------------------- footer */
.footer { border-top: 1px solid var(--rule); }
.footer-inner {
  max-width: var(--content); margin: 0 auto; padding: 52px var(--gutter) 66px;
  font-size: 14.6px; color: var(--ink-3);
  display: grid; gap: 38px 60px;
  /* One row: identity, links, related work — a single block. */
  grid-template-columns: minmax(230px, 1fr) auto minmax(300px, 1.05fr);
  align-items: start;
}
.footer-inner > * { min-width: 0; }
.footer-mark { font-family: var(--serif); font-size: 21px; color: var(--ink); margin-bottom: 6px; }
.footer-brand p { margin: 0; }
.footer-contact { margin-top: 10px !important; }
.footer-links { display: flex; flex-direction: column; gap: 22px; }
.footer-inner h3 {
  font-family: var(--sans); font-size: 13px; font-weight: 600; color: var(--ink-2);
}
.footer-inner ul { list-style: none; margin: 7px 0 0; padding: 0; line-height: 2; }

.footer-related ul.related {
  display: grid; gap: 16px 44px; line-height: 1.5;
  grid-template-columns: 1fr;
}
.footer-related li > a { color: var(--ink-2); }
.footer-related li > a:hover { color: var(--clay); }
.footer-related .meta { display: block; margin-top: 1px; font-size: 13.2px; color: var(--ink-3); }

/* ------------------------------------------------------------ responsive */
@media (max-width: 860px) {
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  :root { --gutter: 22px; }

  /* Sections move into a panel under the bar; the controls stay on the right. */
  .nav-inner { position: relative; }
  .nav-tools { margin-left: auto; }
  .menu-btn { display: grid; }
  .nav-links {
    display: none; position: absolute; top: 56px; left: calc(var(--gutter) * -1);
    right: calc(var(--gutter) * -1); flex-direction: column; gap: 0; margin: 0;
    padding: 6px var(--gutter) 14px;
    background: var(--paper); border-bottom: 1px solid var(--rule);
  }
  .nav[data-menu="open"] .nav-links { display: flex; }
  .nav-links a { padding: 10px 0; font-size: 15.5px; color: var(--ink-2); }
  .hero { min-height: 0; padding: 44px var(--gutter) 40px; }
  .hero .standfirst .lb { display: none; }
  .btn { font-size: 14.4px; padding: 8px 15px; }
  .plate { padding: 12px; }
  .pair { flex-direction: column; }
  .pair figure { width: 100%; }
}

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