/* CoShop project site — palette drawn from the hero figure:
   white canvas, near-black ink, soft periwinkle-lavender accent, warm tan example boxes. */

:root {
  --ink: #1c1d2b;
  --ink-soft: #555a72;
  --ink-faint: #8a8fa6;
  --bg: #ffffff;
  --panel: #f5f5fa;
  --panel-line: #e6e7f0;

  --accent: #6c6fc7;        /* periwinkle */
  --accent-dark: #4f52a6;
  --accent-soft: #eef0fb;
  --accent-line: #c8cbf0;

  /* SEC category colors (match the paper's problem.png coding) */
  --search: #6c6fc7;        /* periwinkle */
  --search-bg: #eef0fb;
  --experience: #c85a8e;    /* rose */
  --experience-bg: #fbeaf2;
  --credence: #7a8090;      /* gray */
  --credence-bg: #eef0f3;
  --tan: #f3ead9;

  --radius: 14px;
  --maxw: 1080px;
  --shadow: 0 1px 3px rgba(28, 29, 43, 0.06), 0 8px 28px rgba(28, 29, 43, 0.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--panel-line);
}
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 60px; }
.nav .brand { font-weight: 700; letter-spacing: -0.01em; font-size: 1.1rem; color: var(--ink); }
.nav .brand span { color: var(--accent); }
.nav .links { margin-left: auto; display: flex; gap: 22px; align-items: center; }
.nav .links a { color: var(--ink-soft); font-size: 0.93rem; font-weight: 500; }
.nav .links a:hover { color: var(--accent-dark); text-decoration: none; }
@media (max-width: 720px) { .nav .links a:not(.btn-mini) { display: none; } }

.btn-mini {
  background: var(--accent); color: #fff !important; padding: 7px 14px;
  border-radius: 999px; font-size: 0.86rem; font-weight: 600;
}
.btn-mini:hover { background: var(--accent-dark); text-decoration: none !important; }
.btn-mini-ghost {
  background: #fff; color: var(--ink-soft) !important;
  border: 1px solid var(--panel-line);
}
.btn-mini-ghost:hover { background: var(--panel); border-color: var(--accent-line); }

/* ---------- hero ---------- */
.hero { padding: 72px 0 40px; }
.hero .eyebrow {
  display: inline-block; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent-dark);
  background: var(--accent-soft); border: 1px solid var(--accent-line);
  padding: 5px 13px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(2rem, 4.2vw, 3.1rem); line-height: 1.12; letter-spacing: -0.02em;
  margin: 0 0 18px; font-weight: 800; max-width: 18ch;
}
.hero .lede { font-size: 1.2rem; color: var(--ink-soft); max-width: 60ch; margin: 0 0 30px; }
.hero .cta { display: flex; gap: 14px; flex-wrap: wrap; }
.section-head + .cta { margin-top: 24px; }

.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: 0.98rem;
  border: 1px solid transparent; transition: transform .05s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--panel-line); box-shadow: var(--shadow); }
.btn-ghost:hover { border-color: var(--accent-line); }

.hero-figure { margin: 64px 0 0; }
.hero-figure img {
  width: 100%; border-radius: var(--radius); border: 1px solid var(--panel-line);
  box-shadow: var(--shadow); background: #fff;
}

/* ---------- generic section ---------- */
section { padding: 56px 0; }
section.alt { background: var(--panel); border-top: 1px solid var(--panel-line); border-bottom: 1px solid var(--panel-line); }
.section-head { max-width: 88ch; margin-bottom: 32px; }
.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.05rem); letter-spacing: -0.02em; margin: 0 0 10px; font-weight: 800;
}
.section-head .kicker { color: var(--accent-dark); font-weight: 700; font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase; }
.section-head p { color: var(--ink-soft); font-size: 1.06rem; margin: 8px 0 0; }

.section-lead { max-width: 90ch; font-size: 1.06rem; color: var(--ink-soft); }
.install-bar {
  margin: 16px 0 0; display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap;
  background: #fff; border: 1px solid var(--panel-line); border-radius: 10px;
  padding: 12px 16px; box-shadow: var(--shadow);
}
.install-cmd { font-size: 0.95rem; color: var(--ink); }
.install-cmd .prompt { color: var(--ink-faint); margin-right: 9px; user-select: none; }
.install-links { font-size: 0.92rem; color: var(--ink-faint); }
.install-links a { color: var(--accent-dark); font-weight: 600; }
.install-links .sep { margin: 0 10px; }
.section-lead strong { color: var(--accent-dark); }

.abstract-body { max-width: 90ch; font-size: 1.12rem; color: var(--ink); }
.abstract-body strong { color: var(--accent-dark); }

figure.fig { margin: 0; }
figure.fig img { width: 100%; border-radius: var(--radius); border: 1px solid var(--panel-line); background: #fff; box-shadow: var(--shadow); }
figure.fig figcaption { color: var(--ink-faint); font-size: 0.92rem; margin-top: 12px; text-align: center; }
figure.fig.flat img { box-shadow: none; border: none; }
figure.fig.narrow { max-width: 820px; margin-left: 0; margin-right: auto; }

.cite-ref { font-size: 0.72em; font-weight: 600; color: var(--accent-dark); vertical-align: super; padding: 0 1px; }
.cite-ref:hover { text-decoration: none; }
.refs { margin: 12px 0 0; padding-left: 1.4em; color: var(--ink-faint); font-size: 0.78rem; }
.refs li { margin-bottom: 4px; }
.refs a { color: var(--ink-soft); }
.refs a:hover { color: var(--accent-dark); }

/* evaluation philosophy */
.metric-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 8px; }
@media (max-width: 680px) { .metric-cols { grid-template-columns: 1fr; } }
.metric p { margin: 0; color: var(--ink-soft); font-size: 0.96rem; }
.metric.highlight { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow); }
.metric-tag { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 0.86rem; }
.metric-tag.agent { color: var(--credence); }
.metric-tag.team { color: var(--accent-dark); }
.primary-pill { background: var(--accent); color: #fff; font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.06em; padding: 2px 8px; border-radius: 999px; }
.philosophy-note { margin-top: 22px; max-width: 90ch; font-size: 1.04rem; color: var(--ink); }
.philosophy-note strong { color: var(--accent-dark); }
.metric code, .philosophy-note code { background: var(--panel); padding: 1px 5px; border-radius: 5px; font-size: 0.88em; }

/* results A/B/C commentary */
.panel-text { font-size: 1.08rem; color: var(--ink); max-width: 90ch; margin: 18px 0 0; }
.panel-text strong { color: var(--accent-dark); }

.table-wrap { overflow-x: auto; margin-top: 20px; border: 1px solid var(--panel-line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
.data-table { border-collapse: collapse; width: 100%; font-size: 0.9rem; font-variant-numeric: tabular-nums; }
.data-table th, .data-table td { padding: 9px 12px; text-align: center; border-bottom: 1px solid var(--panel-line); }
.data-table thead th { background: var(--panel); font-weight: 700; color: var(--ink-soft); font-size: 0.82rem; }
.data-table thead tr:first-child th { border-bottom: 1px solid var(--panel-line); }
.data-table .lcell { text-align: left; font-weight: 600; white-space: nowrap; }
.has-tip { border-bottom: 1px dotted var(--accent-line); cursor: help; }
.data-table th.has-tip { border-bottom: 1px dotted var(--accent-line); }
.tag.has-tip { cursor: help; border-style: dashed; }
.data-table tbody tr:hover { background: var(--accent-soft); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* sample transcript */
.conf-key { background: var(--accent-soft); color: var(--accent-dark); padding: 1px 6px; border-radius: 5px; }
.transcript {
  max-width: 90ch; background: #fff; border: 1px solid var(--panel-line);
  border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.t-request {
  background: var(--tan); border-bottom: 1px solid #e6d9bd; padding: 14px 18px;
  font-style: italic; color: var(--ink); font-size: 0.95rem;
}
.t-request .t-who {
  display: block; font-style: normal; font-weight: 700; font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.06em; color: #9a8559; margin-bottom: 4px;
}
.t-turn { padding: 14px 18px; border-bottom: 1px solid var(--panel-line); }
.t-turn:last-child { border-bottom: none; }
.t-label {
  display: inline-block; font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--ink-faint); margin-bottom: 6px;
}
.t-turn p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); line-height: 1.7; }
.t-turn .conf {
  color: var(--accent-dark); background: var(--accent-soft); border-radius: 5px;
  padding: 1px 5px; box-decoration-break: clone; -webkit-box-decoration-break: clone;
}
.t-more summary {
  padding: 12px 18px; cursor: pointer; font-weight: 600; font-size: 0.9rem;
  color: var(--accent-dark); background: var(--panel); list-style-position: inside;
}
.t-more[open] summary { border-bottom: 1px solid var(--panel-line); }

.commentary { margin-top: 24px; max-width: 90ch; }
.commentary p { margin: 0 0 14px; color: var(--ink); }
.commentary strong { color: var(--accent-dark); }
.commentary code { background: var(--panel); padding: 1px 5px; border-radius: 5px; font-size: 0.86em; }

/* the four-stage task pipeline */
.stages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 28px; }
.stage {
  background: #fff; border: 1px solid var(--panel-line); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.stage-img {
  width: 100%; height: 180px; object-fit: contain; margin-bottom: 14px;
}
.stage .stage-title { display: flex; align-items: center; gap: 9px; margin-bottom: 6px; }
.stage .num {
  width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent-dark); font-weight: 700; font-size: 0.88rem; flex: none;
}
.stage h4 { margin: 0; font-size: 1rem; }
.stage p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }
@media (max-width: 760px) { .stages { grid-template-columns: repeat(2, 1fr); } }

/* headline stat */
.statline {
  display: flex; gap: 28px; flex-wrap: wrap; margin-top: 28px;
}
.stat { background: #fff; border: 1px solid var(--panel-line); border-radius: var(--radius); padding: 20px 24px; box-shadow: var(--shadow); }
.stat .big { font-size: 2.2rem; font-weight: 800; color: var(--accent-dark); letter-spacing: -0.02em; }
.stat .lbl { color: var(--ink-soft); font-size: 0.92rem; }

/* results tabs */
.tabs { display: flex; gap: 8px; margin-bottom: 18px; flex-wrap: wrap; }
.results-tabs { margin-top: 32px; }
.tab {
  border: 1px solid var(--panel-line); background: #fff; color: var(--ink-soft);
  padding: 8px 16px; border-radius: 999px; cursor: pointer; font-size: 0.9rem; font-weight: 600;
}
.tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.tabpanel { display: none; }
.tabpanel.active { display: block; }

/* Stack result panels in one grid cell so the container is always as tall as the
   longest panel — the figure below stays put when switching tabs. */
.tabpanels { display: grid; }
.tabpanels > .tabpanel { grid-area: 1 / 1; display: block; visibility: hidden; }
.tabpanels > .tabpanel.active { visibility: visible; }

/* ---------- dataset explorer ---------- */
.explorer-single { display: flex; flex-direction: column; gap: 18px; margin-top: 28px; }
.exp-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 680px) { .exp-controls { grid-template-columns: 1fr; } }

.explorer { display: grid; grid-template-columns: 300px 1fr; gap: 24px; margin-top: 28px; }
@media (max-width: 860px) { .explorer { grid-template-columns: 1fr; } }

.exp-side { display: flex; flex-direction: column; gap: 18px; }
.domain-tabs {
  display: inline-flex; gap: 6px; flex-wrap: wrap;
  background: var(--panel); border: 1px solid var(--panel-line);
  padding: 6px; border-radius: 14px;
}
.domain-tab {
  border: none; background: transparent; padding: 11px 22px; border-radius: 10px;
  cursor: pointer; font-weight: 700; font-size: 1.05rem; letter-spacing: -0.01em;
  color: var(--ink-soft); transition: background .12s ease, color .12s ease, box-shadow .12s ease;
}
.domain-tab:hover { color: var(--accent-dark); }
.domain-tab.active {
  background: var(--accent); color: #fff;
  box-shadow: 0 2px 8px rgba(108, 111, 199, 0.35);
}

.card { background: #fff; border: 1px solid var(--panel-line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.card h4 { margin: 0 0 12px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); }

.statgrid { display: grid; grid-template-columns: 1fr auto; gap: 6px 14px; font-size: 0.9rem; }
.statgrid .k { color: var(--ink-soft); }
.statgrid .v { font-weight: 600; font-variant-numeric: tabular-nums; }

.exp-stack-block { margin-top: 28px; }
.exp-stack-block .spec-picker { margin-bottom: 14px; }
.picker-head { margin: 0 0 10px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); }
.stack-card { background: var(--accent-soft); border-color: var(--accent-line); }

/* target item note */
.target-note { margin-bottom: 14px; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.target-note:empty { display: none; }
.tgt-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700; color: var(--ink-faint); }
.tgt-name { font-weight: 700; font-size: 1.05rem; color: var(--ink); }
.tgt-id { font-size: 0.82rem; color: var(--ink-faint); font-variant-numeric: tabular-nums; }

/* SEC distribution bars */
.dist-legend { display: flex; gap: 14px; margin: 8px 0 12px; font-size: 0.78rem; color: var(--ink-soft); }
.dist-legend span { display: inline-flex; align-items: center; gap: 7px; }
.dist-legend .dot { margin-right: 3px; }
.sec-dist { display: flex; flex-direction: column; gap: 7px; margin-top: 4px; max-height: 215px; overflow-y: auto; padding-right: 6px; }
.sec-dist::-webkit-scrollbar { width: 8px; }
.sec-dist::-webkit-scrollbar-thumb { background: var(--accent-line); border-radius: 4px; }
.dist-row { display: grid; grid-template-columns: 130px 1fr; align-items: center; gap: 10px; }
.dist-name { font-size: 0.8rem; color: var(--ink-soft); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dist-bar { display: flex; height: 14px; border-radius: 4px; overflow: hidden; background: var(--panel); }
.dist-bar .seg { height: 100%; }
.dist-bar .seg.search { background: var(--search); }
.dist-bar .seg.experience { background: var(--experience); }
.dist-bar .seg.credence { background: var(--credence); }

.spec-picker { display: flex; gap: 8px; flex-wrap: wrap; }
.spec-btn { border: 1px solid var(--panel-line); background: #fff; border-radius: 8px; padding: 6px 12px; cursor: pointer; font-weight: 600; font-size: 0.85rem; color: var(--ink-soft); }
.spec-btn.active { border-color: var(--accent); color: var(--accent-dark); background: var(--accent-soft); }

.exp-main { display: flex; flex-direction: column; gap: 20px; }

/* SEC columns */
.sec-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 620px) { .sec-cols { grid-template-columns: 1fr; } }
.sec-col { border-radius: var(--radius); padding: 14px; border: 1px solid var(--panel-line); }
.sec-col.search { background: var(--search-bg); border-color: var(--accent-line); }
.sec-col.experience { background: var(--experience-bg); border-color: #f0c8dc; }
.sec-col.credence { background: var(--credence-bg); border-color: #dadde2; }
.sec-col .sec-title { font-weight: 700; font-size: 0.92rem; display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.sec-col .sec-sub { font-size: 0.78rem; color: var(--ink-soft); margin-bottom: 10px; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot.search { background: var(--search); }
.dot.experience { background: var(--experience); }
.dot.credence { background: var(--credence); }

.chips { display: flex; flex-direction: column; gap: 6px; }
.chip {
  background: #fff; border: 1px solid var(--panel-line); border-radius: 8px; padding: 6px 10px;
  font-size: 0.84rem; line-height: 1.35;
}
.chip .cname { font-weight: 600; }
.chip .cdesc { color: var(--ink-soft); font-size: 0.78rem; display: block; }

/* preference stack */
.stack { display: flex; flex-direction: column; gap: 0; }
.stack-query {
  background: var(--tan); border: 1px solid #e6d9bd; border-radius: 10px; padding: 12px 14px; margin-bottom: 14px;
}
.stack-query .lbl { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: #9a8559; font-weight: 700; }
.stack-query .q { font-style: italic; }

.layer { position: relative; border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; border: 1px solid var(--panel-line); background: #fff; }
.layer .layer-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.layer .badge { font-size: 0.72rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; }
.layer .layer-name { font-weight: 700; font-size: 0.95rem; }
.layer .layer-note { color: var(--ink-faint); font-size: 0.82rem; margin-left: auto; }
.layer .feature-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: 0.8rem; padding: 4px 9px; border-radius: 7px; background: var(--panel); border: 1px solid var(--panel-line); display: inline-flex; align-items: baseline; gap: 6px; }
.tag .tname { color: var(--ink-soft); font-weight: 600; }
.tag .tval { color: var(--ink); font-weight: 700; }
.tag .tval::before { content: "="; color: var(--ink-faint); font-weight: 400; margin-right: 4px; }
.tag.search { background: var(--search-bg); border-color: var(--accent-line); }
.tag.experience { background: var(--experience-bg); border-color: #f0c8dc; }
.tag.credence { background: var(--credence-bg); border-color: #dadde2; }

.layer.initial { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.layer.initial .badge { background: var(--accent); color: #fff; }
.badge.search { background: var(--search-bg); color: var(--accent-dark); }
.badge.experience { background: var(--experience-bg); color: var(--experience); }
.badge.credence { background: var(--credence-bg); color: var(--credence); }

/* ---------- citation / footer ---------- */
pre.cite {
  background: var(--ink); color: #e8e8f2; border-radius: var(--radius); padding: 20px 22px;
  overflow-x: auto; font-size: 0.86rem; line-height: 1.5;
}
footer { padding: 40px 0; border-top: 1px solid var(--panel-line); color: var(--ink-faint); font-size: 0.9rem; }
footer .wrap { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
footer a { color: var(--ink-soft); }

.note { font-size: 0.85rem; color: var(--ink-faint); }
.placeholder-url { border-bottom: 1px dashed var(--accent-line); }