:root {
  --bg: #ece8df;
  --bg-line: rgba(150, 128, 92, 0.07);
  --paper: #fdfaf3;
  --panel: var(--paper);
  --ink: #1a1a1a;
  --ink-soft: #555;
  --ink-faint: #8a8a8a;
  --line: #e6e4df;
  --accent: #3b4a9c;
  --accent-soft: #eceefb;
  --ok: #1f9d57;
  --ok-soft: #e3f5ea;
  --fail: #d3493b;
  --fail-soft: #fbe7e4;
  --radius: 12px;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--bg);
  background-image: repeating-linear-gradient(
    135deg,
    var(--bg-line) 0,
    var(--bg-line) 1px,
    transparent 1px,
    transparent 4px
  );
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- White canvas (sheet over the textured surface) ---------- */
.sheet {
  width: calc(100% - 48px);
  max-width: 1040px;
  margin: 56px auto;
  padding: 0 24px 60px; /* side gutter; bottom mirrors the hero's top space */
  background: var(--paper);
  border-radius: var(--radius);
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 14px 44px rgba(45, 38, 22, 0.12);
}

/* ---------- Hero ---------- */
.hero {
  max-width: 960px;
  margin: 0 auto;
  padding: 88px 0 40px;
  text-align: center;
}
.title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.9rem, 4.4vw, 2.5rem);
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  line-height: 1.15;
  text-wrap: balance;
}
.title .acr { color: #b5533a; }
.subtitle {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  color: var(--ink-soft);
  margin: 0 auto 28px;
  max-width: 620px;
}
.authors, .affiliations {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 18px;
}
.authors { font-size: 1.05rem; margin-bottom: 8px; }
.authors sup { color: var(--ink-faint); font-size: 0.7em; }
.affiliations {
  font-size: 0.9rem;
  color: var(--ink-soft);
  gap: 4px 16px;
  margin-bottom: 26px;
}
.links {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
.links a {
  display: inline-block;
  padding: 8px 20px;
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 500;
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 2px 8px rgba(45, 38, 22, 0.07);
  transition: color .15s, background .15s, box-shadow .15s, transform .15s;
}
.links a:hover {
  text-decoration: none;
  color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 2px 10px rgba(59, 74, 156, 0.16);
  transform: translateY(-1px);
}

/* ---------- Sections ---------- */
.section {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 0;
}
.section h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.6rem;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}
/* Shared compact text style (abstract + evaluation). */
.compact {
  border-top: 1px solid var(--line);
  padding-top: 40px;
}
.compact h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: #000;
  margin: 20px 0 8px;
}
.compact h3:first-of-type { margin-top: 0; }
.compact p { margin: 0 0 10px; color: #000; line-height: 1.45; }
.compact ul { margin: 0 0 10px; padding-left: 1.2em; color: #000; }
.compact li { margin: 0 0 5px; line-height: 1.45; }

.method { border-top: 1px solid var(--line); padding-top: 40px; }
.method p { margin: 0 0 16px; color: #2b2b2b; }
.method-figure { margin: 8px 0 28px; }
.method-figure img { display: block; width: 100%; height: auto; }
.method-figure figcaption,
.method-demo figcaption {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.5;
  color: #6f6a63;
  text-align: left;
}
/* Beat the generic .method p rule inside the demo caption. */
.method .method-demo figcaption p { margin: 0 0 6px; color: inherit; }
.method-demo figcaption ul { margin: 0; padding-left: 1.2em; }
.method-demo figcaption li { margin: 2px 0; }
.method-figure figcaption code,
.method-demo figcaption code { font-size: 13px; }
.method-demo figcaption .hl-time {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
}
.method-demo { margin: 24px 0; }
.method-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 16px;
}
/* Both classes are on the wrap; .video-wrap (4/3) is defined later, so qualify to win. */
.video-wrap.method-video-wrap {
  aspect-ratio: 26 / 9;
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 6px 22px rgba(45, 38, 22, 0.08);
}

.fold { margin-top: 8px; }
.fold summary {
  cursor: pointer;
  font-weight: 500;
  width: fit-content;
}
.fold summary:hover { color: var(--accent); }
.evaluation figcaption .fold ul { margin: 8px 0 0; color: inherit; }
.evaluation figcaption .fold li { margin: 0 0 6px; line-height: 1.5; }
.fold .results-table { margin-top: 12px; }
.fold .results-table + .results-table { margin-top: 48px; }
.results-table tr.overall td { border-top: 2px solid var(--line); }
/* Empty spacer column breaks the row rules between the minimal and detailed groups. */
.results-table .spacer { border: 0; padding: 0; width: 18px; }
.results-table tr.overall td.spacer { border: 0; }
.evaluation .table-note { font-size: 13.5px; color: var(--ink-faint); }
.results-table {
  width: 100%;
  border-collapse: collapse;
  margin: 4px 0 24px;
  font-size: 15px;
  color: #2b2b2b;
}
.results-table th,
.results-table td {
  padding: 8px 12px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}
.results-table thead th {
  font-weight: 600;
  border-bottom: 2px solid var(--line);
  white-space: nowrap;
}
.results-table th:first-child,
.results-table td:first-child { text-align: left; }
.results-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
  margin: 4px 0 24px;
}
.results-row .results-table { margin: 0; font-size: 14px; }
.results-row .results-table th,
.results-row .results-table td { padding: 6px 10px; }
.results-table thead small {
  display: block;
  font-weight: 400;
  font-size: 0.9em;
  color: var(--ink-faint);
}
.results-table caption {
  caption-side: top;
  text-align: left;
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink-faint);
  padding-bottom: 8px;
  white-space: nowrap;
}
@media (max-width: 760px) {
  .results-row { grid-template-columns: 1fr; gap: 20px; }
}

.showcase { border-top: 1px solid var(--line); padding-top: 40px; }


/* ---------- MCP Tools ---------- */
.tools { border-top: 1px solid var(--line); padding-top: 40px; }
.tools-layout {
  display: grid;
  grid-template-columns: 242px 1fr;
  gap: 10px;
  align-items: start;
}
.tools-side h2 { line-height: 1.15; } /* top-align heading with the detail box */
.tool-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.tool-name {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.86rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  padding: 8px 12px;
  background: transparent;
  color: var(--ink-soft);
  transition: color .12s, background .12s;
}
.tool-name:hover { background: rgba(45, 38, 22, 0.05); color: var(--ink); }
.tool-name.active { background: var(--accent-soft); color: var(--accent); }
.tool-detail {
  min-width: 0; /* allow the panel to shrink inside the grid */
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 6px 22px rgba(45, 38, 22, 0.08);
  padding: 22px;
}
.tool-sig {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  word-break: break-word;
}
.tool-doc {
  margin-top: 14px;
  white-space: pre-wrap;
  font-size: 0.9rem;
  line-height: 1.55;
  color: #2b2b2b;
}
.tool-doc .tok {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85em;
  background: rgba(45, 38, 22, 0.055);
  padding: 1px 4px;
  border-radius: 5px;
}
.tool-media {
  margin-top: 18px;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: #11131a;
}
.tool-media video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}
.tool-media.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(45, 38, 22, 0.05);
  color: var(--ink-faint);
  font-size: 0.85rem;
}

/* ---------- Task tabs ---------- */
.task-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}
.task-tab, .method-tab {
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  padding: 9px 18px;
  background: var(--panel);
  color: var(--ink-soft);
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 2px 8px rgba(45, 38, 22, 0.07);
  transition: color .12s, background .12s, box-shadow .12s, transform .12s;
}
.task-tab:hover, .method-tab:hover { transform: translateY(-1px); }
.task-tab.active, .method-tab.active {
  color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 2px 10px rgba(59, 74, 156, 0.16);
}

/* ---------- Viewer ---------- */
.viewer {
  margin-top: 30px;
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 6px 22px rgba(45, 38, 22, 0.08);
  padding: 22px;
}
.viewer-head { margin-bottom: 18px; }
.viewer-head h3 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0;
}

/* ---------- Variant selector (label + success rate in one button) ---------- */
.variant-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.variant-tab {
  display: inline-flex;
  align-items: baseline;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  padding: 7px 14px;
  background: var(--panel);
  color: var(--ink-soft);
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 2px 8px rgba(45, 38, 22, 0.07);
  transition: color .12s, background .12s, box-shadow .12s, transform .12s;
}
.variant-tab:hover { transform: translateY(-1px); color: var(--ink); }
.variant-tab.active {
  color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 2px 10px rgba(59, 74, 156, 0.16);
}
.variant-rate { opacity: 0.62; font-weight: 600; }
.variant-rate::before { content: "·"; margin: 0 7px; opacity: 0.7; }

.seed-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.seed-chip {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  padding: 6px 12px;
  background: var(--panel);
  color: var(--ink-soft);
  box-shadow:
    0 1px 2px rgba(45, 38, 22, 0.05),
    0 2px 8px rgba(45, 38, 22, 0.07);
  transition: color .12s, background .12s, box-shadow .12s, transform .12s;
}
.seed-chip.ok { color: #157a42; }
.seed-chip.fail { color: #b23a2e; }
.seed-chip:hover { transform: translateY(-1px); }
.seed-chip.ok.active { background: var(--ok-soft); }
.seed-chip.fail.active { background: var(--fail-soft); }

.players {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.player { margin: 0; }
.player figcaption {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-faint);
  margin-bottom: 8px;
}
.video-wrap {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  aspect-ratio: 4 / 3;
}
.video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}
.video-wrap.empty::after {
  content: "no video";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6b7280;
  font-size: 0.85rem;
}
.video-wrap.empty video { display: none; }

.seed-stats {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.seed-stats b { color: var(--ink); font-weight: 600; }
.seed-stats .verdict-ok { color: #157a42; font-weight: 600; }
.seed-stats .verdict-fail { color: #b23a2e; font-weight: 600; }

.seed-transcript { margin-top: 12px; }
.transcript summary {
  cursor: pointer;
  width: fit-content;
  list-style: none;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  padding: 4px 0;
}
.transcript summary::before { content: "▶"; font-size: 1em; margin-right: 8px; }
.transcript[open] summary::before { content: "▼"; }
.transcript summary::-webkit-details-marker { display: none; }
.transcript-body {
  margin: 8px 0 0;
  max-height: 510px;
  overflow: auto;
  background: rgba(45, 38, 22, 0.04);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88rem;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink-soft);
}
.tr-entry { margin-bottom: 7px; }
.tr-entry:last-child { margin-bottom: 0; }
.tr-time { color: var(--ink-faint); }
.tr-tag { display: inline-block; min-width: 6ch; }
.tr-say .tr-tag { color: var(--ink); }
.tr-tool .tr-tag { color: var(--accent); }
.tr-say .tr-text { color: var(--ink); }
.tr-tool-name { color: var(--accent); font-weight: 600; }
.tr-args { color: var(--accent); }

@media (max-width: 640px) {
  .players { grid-template-columns: 1fr; }
  .hero { padding-top: 56px; }
  .tools-layout { grid-template-columns: 1fr; }
  .tool-list { flex-direction: row; flex-wrap: wrap; }
}