/* AgentDiscover — project page.
   Palette taken from the paper's figures: search agent = rust,
   runtime/server = forest, meta agent = steel blue. The page is a run of
   bands in those hues: a deep-forest header, paper for the loop and the
   abstract, a soft green band for results, near-black green to close. */

:root {
  --paper: #f6f5f1;
  --card: #ffffff;
  --ink: #1d2024;
  --body: #33373d;
  --mute: #767d87;
  --faint: #9aa1aa;
  --line: #dddfe3;
  --wash: #f3f2ee;

  --agent: #b5442b;
  --agent-bg: #f8eeeb;
  --agent-light: #e0836a;        /* rust that reads on the dark bands */
  --server: #0b6e4f;
  --server-bg: #e9f1ee;
  --meta: #2e5c8a;
  --folder: #f3e2b3;
  --folder-line: #c8a45a;

  --deep: #0e3d2f;               /* header band */
  --deep-2: #124a39;
  --deep-ink: #15201b;           /* citation band */
  --band: #e6efe9;               /* results band */
  --on-deep: #f1f5f2;
  --on-deep-mute: rgba(241, 245, 242, 0.68);
  --on-deep-line: rgba(241, 245, 242, 0.18);

  --shadow: 0 1px 2px rgba(20, 30, 25, 0.06), 0 24px 48px -24px rgba(20, 30, 25, 0.35);

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --text-col: 42rem;
  --wide-col: 64rem;

  /* The paper's figures are drawn on white, so the page commits to light. */
  color-scheme: light;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--body);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.wrap {
  max-width: var(--wide-col);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.prose {
  max-width: var(--text-col);
  margin-left: auto;
  margin-right: auto;
}

/* ── header band ────────────────────────────────────────────────────── */

header.hero {
  padding: 1.5rem 0 8.5rem;
  background: linear-gradient(170deg, var(--deep-2) 0%, var(--deep) 60%, #0b3327 100%);
  color: var(--on-deep);
  border-top: 3px solid var(--agent-light);
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--on-deep-line);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--on-deep-mute);
}

.hero-text { padding: 3.6rem 0 0; }

h1.title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.022em;
  color: #fff;
}

.tagline {
  margin: 0.9rem 0 0;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--on-deep-mute);
}

.rule {
  width: 3rem;
  height: 2px;
  margin: 1.7rem 0;
  border: 0;
  background: var(--agent-light);
}

.authors {
  margin: 0;
  max-width: 36rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--on-deep);
}

/* A name never breaks across lines; only the commas between names do. */
.authors a,
.authors span { white-space: nowrap; }

.authors a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s;
}
.authors a:hover { text-decoration-color: var(--agent-light); }

/* ── link buttons ───────────────────────────────────────────────────── */

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.6rem;
}

.links a,
.links span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.05rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 550;
  line-height: 1;
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: transparent;
  color: #fff;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.links a:hover {
  background: #fff;
  border-color: #fff;
  color: var(--deep);
  text-decoration: none;
}

/* A link that does not exist yet still holds its place. */
.links span.pending {
  color: var(--on-deep-mute);
  border: 1px dashed rgba(255, 255, 255, 0.32);
  cursor: default;
}

.links svg { width: 15px; height: 15px; flex: none; }

/* ── sections ───────────────────────────────────────────────────────── */

section { padding: 3.6rem 0; }

.eyebrow {
  display: block;
  margin: 0 0 1.2rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--agent);
}

.sec-head { margin-bottom: 1.6rem; }
.sec-head .eyebrow { margin-bottom: 0.6rem; color: var(--server); }
.sec-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-wrap: balance;
}

p { margin: 0 0 1.1rem; }

.prose p { font-family: var(--serif); font-size: 1.12rem; line-height: 1.72; }

/* The abstract: one paragraph on a wide measure, justified so every line
   runs the same length. */
.abstract { border-top: 1px solid var(--line); }
.prose-wide { max-width: 56rem; }
.prose-wide p {
  font-size: 1.08rem;
  line-height: 1.7;
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}

.note {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--faint);
}

/* ── results band ───────────────────────────────────────────────────── */

.results { background: var(--band); padding: 4rem 0 4.4rem; }

figure { margin: 0; }

figure img {
  display: block;
  width: 100%;
  height: auto;
}

figcaption {
  max-width: 44rem;
  margin: 1rem auto 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--mute);
}

figcaption b { color: var(--body); font-weight: 650; }

.fig {
  padding: 1.4rem 1.4rem 1.2rem;
  background: var(--card);
  border: 1px solid rgba(11, 110, 79, 0.12);
  border-radius: 14px;
  box-shadow: var(--shadow);
}
.fig figcaption { margin-top: 1.1rem; }

/* ── citation band ──────────────────────────────────────────────────── */

.cite {
  background: var(--deep-ink);
  color: var(--on-deep);
  padding: 4rem 0 2.6rem;
}
.cite .eyebrow { color: var(--agent-light); }
.cite .note { color: var(--on-deep-mute); }

pre {
  margin: 0;
  padding: 1.15rem 1.3rem;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.83rem;
  line-height: 1.65;
  color: #d9e3dd;
}

footer {
  background: var(--deep-ink);
  padding: 0 0 3rem;
  font-size: 0.85rem;
  color: var(--on-deep-mute);
  text-align: center;
}

footer a { color: var(--on-deep-mute); text-decoration: underline; text-underline-offset: 2px; }
footer a:hover { color: #fff; }

/* ── the animated loop ──────────────────────────────────────────────── */

/* The card is pulled up into the header band so the two share an edge. */
.loop { padding: 0 0 3rem; margin-top: -5rem; }

.loop-stage-wrap {
  overflow-x: auto;
  padding: 0.9rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.loop-stage { min-width: 720px; }

.loop-svg {
  display: block;
  width: 100%;
  height: auto;
  font-family: var(--sans);
}
.loop-svg text { fill: var(--ink); }

/* boxes */
.panel-bg { stroke-width: 1.5; }
.p-agent .panel-bg { fill: var(--agent-bg); stroke: var(--agent); }
.p-memory .panel-bg { fill: var(--server-bg); stroke: var(--server); }

.panel-title { font-size: 15px; font-weight: 700; letter-spacing: -0.01em; }
.p-agent .panel-title { fill: var(--agent); }
.p-memory .panel-title { fill: var(--server); }
.panel-aside { font-family: var(--mono); font-size: 11px; fill: var(--mute); }

.pane-bg,
.sub-bg { fill: #fff; stroke: var(--line); }
.sub-t { font-size: 10.5px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; fill: var(--server); }

/* the agent's context log */
.file-card { fill: var(--wash); stroke: var(--line); }
.file-bar { fill: var(--agent); }
.ln { font-family: var(--mono); font-size: 11.5px; fill: var(--body); transition: opacity 0.25s; }
.ln.h { fill: var(--ink); font-weight: 600; }
.ln.file-name { fill: var(--agent); font-weight: 700; }
.ln.code { fill: var(--meta); }
.ln.in { fill: var(--server); }
.ln.in.b { font-weight: 700; }
.ln.think { fill: var(--mute); font-style: italic; }

.think { transition: opacity 0.2s; }
.spin { fill: none; stroke: var(--agent); stroke-width: 2; stroke-dasharray: 18 14; stroke-linecap: round; }
.think-t { font-family: var(--mono); font-size: 11.5px; font-style: italic; fill: var(--mute); }
.cursor { fill: var(--ink); }

/* the packing */
.pack { transition: opacity 0.4s; }
.pack.dim { opacity: 0.3; }
.pack-bg { fill: #fff; stroke: var(--line); }
.pack-c { fill: var(--agent-bg); stroke: var(--agent); stroke-width: 1.2; }

.ro-label { font-size: 10.5px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; fill: var(--mute); }
.ro-big { font-size: 30px; font-weight: 700; letter-spacing: -0.02em; fill: var(--ink); font-variant-numeric: tabular-nums; }
.ro-sub { font-size: 11px; fill: var(--mute); }

/* the worktree */
.wt { font-family: var(--mono); font-size: 11px; fill: var(--body); }
.fi { fill: #fff; stroke: var(--mute); stroke-width: 0.9; stroke-linejoin: round; transition: stroke 0.3s, fill 0.3s; }
.fi-fold { fill: none; stroke: var(--mute); stroke-width: 0.9; stroke-linejoin: round; transition: stroke 0.3s; }
.fo { fill: var(--folder); stroke: var(--folder-line); stroke-width: 0.8; }
.wt-row .wt { transition: fill 0.3s; }
.wt-row.running .wt { fill: var(--agent); font-weight: 700; }
.wt-row.running .fi { fill: var(--agent-bg); stroke: var(--agent); }
.wt-row.running .fi-fold { stroke: var(--agent); }
.tool-status { font-family: var(--mono); font-size: 10.5px; font-style: italic; fill: var(--agent); }

/* the graph */
.e-idea { stroke: var(--faint); stroke-width: 1.3; transition: stroke 0.2s, stroke-width 0.2s; }
.e-ideas { stroke: var(--agent); stroke-width: 1.2; stroke-dasharray: 2 4; opacity: 0.7; }
.e-par { stroke: var(--mute); stroke-width: 1.4; }
.e-idea.lit { stroke: var(--server); stroke-width: 2.4; }

.idea-b { fill: var(--agent-bg); stroke: var(--agent); stroke-width: 1.5; transition: filter 0.3s; }
.idea-b.lit { filter: drop-shadow(0 0 4px rgba(181, 68, 43, 0.65)); }
.idea-l { font-size: 12px; font-weight: 700; fill: var(--agent); text-anchor: middle; }

.cand { fill: #fff; stroke: var(--mute); stroke-width: 1.5; transition: fill 0.3s, stroke 0.3s, stroke-width 0.3s; }
.cand.seen { stroke: var(--server); stroke-width: 2.6; }
.cand.best { fill: var(--agent); stroke: var(--agent); }
.cand-l { font-family: var(--mono); font-size: 11px; fill: var(--mute); transition: fill 0.3s; }
.cand-l.best { fill: var(--agent); font-weight: 700; }
.legend { font-size: 10.5px; fill: var(--mute); }
.plan { font-family: var(--mono); font-size: 10.5px; fill: var(--server); }
.tdot { fill: var(--server); transition: opacity 0.15s; }

/* evaluator and steering */
.eval-icon { fill: var(--server-bg); stroke: var(--server); stroke-width: 1.5; transition: filter 0.3s, fill 0.3s; }
.eval-check { fill: none; stroke: var(--server); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.eval.busy .eval-icon { fill: #fff; filter: drop-shadow(0 0 7px rgba(11, 110, 79, 0.7)); }
.eval-t { font-size: 12.5px; font-weight: 700; fill: var(--server); text-anchor: middle; }
.eval-s { font-size: 10px; fill: var(--mute); text-anchor: middle; }
.eval-status { font-family: var(--mono); font-size: 10.5px; font-style: italic; fill: var(--server); text-anchor: middle; }

.steer-l { font-family: var(--mono); font-size: 10.5px; fill: var(--body); }
.steer-l.b { fill: var(--server); font-weight: 700; }

/* arrows */
.arrow { stroke: var(--faint); stroke-width: 1.5; fill: none; transition: stroke 0.2s, stroke-width 0.2s; }
.arrow.on { stroke: var(--ink); stroke-width: 2.2; }
.arrow-l { font-size: 11px; fill: var(--mute); text-anchor: middle; }
.mk-faint path { fill: var(--faint); }
.mk-mute path { fill: var(--mute); }
.mk-ink path { fill: var(--ink); }
.mk-server path { fill: var(--server); }

.dot { transition: opacity 0.15s; }
.dot.d-agent { fill: var(--agent); }
.dot.d-server { fill: var(--server); }

/* step rail, its return arrow, controls, caption */
.loop-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-top: 1.1rem;
}

.loop-rail-wrap { position: relative; padding-top: 34px; }

.loop-back {
  position: absolute;
  left: 0;
  top: 0;
  overflow: visible;
  pointer-events: none;
}
.back-arrow { fill: none; stroke: var(--ink); stroke-width: 2.2; stroke-linecap: round; }
.back-l {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  fill: var(--ink);
  paint-order: stroke;
  stroke: var(--paper);
  stroke-width: 5px;
  stroke-linejoin: round;
}
.back-dot { fill: var(--agent); }

.loop-rail { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.loop-rail button,
.loop-controls button {
  font: inherit;
  font-size: 0.82rem;
  font-weight: 550;
  color: var(--mute);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.38rem 0.9rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.loop-rail button b {
  display: inline-block;
  min-width: 1.1em;
  margin-right: 0.45rem;
  font-weight: 700;
  color: var(--faint);
}

.loop-rail button:hover,
.loop-controls button:hover { border-color: var(--mute); color: var(--ink); }

.loop-rail button[aria-selected="true"] {
  background: var(--deep);
  border-color: var(--deep);
  color: #fff;
}
.loop-rail button[aria-selected="true"] b { color: rgba(255, 255, 255, 0.6); }

.loop-rail button:focus-visible,
.loop-controls button:focus-visible { outline: 2px solid var(--agent); outline-offset: 2px; }

.loop-controls { display: flex; gap: 0.35rem; }
.loop-controls .loop-play { min-width: 4.6rem; }

.loop-caption {
  max-width: var(--text-col);
  min-height: 3.4em;
  margin: 1.1rem auto 0;
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--body);
  text-align: center;
  text-wrap: balance;
}

.loop noscript img { display: block; width: 100%; height: auto; margin-top: 1rem; }

/* ── small screens ──────────────────────────────────────────────────── */

@media (max-width: 640px) {
  body { font-size: 16px; }
  header.hero { padding-bottom: 6.5rem; }
  .hero-text { padding-top: 2.4rem; }
  section { padding: 2.6rem 0; }
  .loop { margin-top: -4rem; }
  .loop-stage-wrap { padding: 0.5rem; }
  .fig { padding: 0.8rem; }
  .loop-bar { justify-content: center; }
  .prose-wide p { text-align: left; hyphens: manual; }
}

@media (prefers-reduced-motion: reduce) {
  .loop-svg *, .links a { transition: none !important; }
}