/* Research Desk: a reading room. Warm paper, serif text, and every citation colored by its source. */
:root {
  color-scheme: light;
  --paper: #f4efe6;
  --sheet: #fffdf8;
  --ink: #1f1b16;
  --muted: #6d655a;
  --faint: #9f968a;
  --line: #e4dccd;
  --line-strong: #d2c7b4;
  --accent: #1f5c45;
  --accent-soft: #e2ebe4;
  --highlight: #f9e79f;
  --serif: "Newsreader", Georgia, serif;
  --sans: "Geist", system-ui, sans-serif;
  --mono: "Geist Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 15px/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Top bar */
.topbar { height: 62px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(16px, 3vw, 40px); border-bottom: 1px solid var(--line-strong); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 16px; text-decoration: none; }
.brand-mark { width: 28px; height: 28px; }
.brand-mark rect { fill: var(--accent); }
.brand-mark .lines { stroke: var(--sheet); stroke-width: 2; stroke-linecap: round; }
.brand-mark circle, .brand-mark .handle { fill: none; stroke: var(--highlight); stroke-width: 2; stroke-linecap: round; }
.brand-ai { margin-left: -4px; padding: 2px 6px; border-radius: 5px; background: var(--highlight); font: 600 11px var(--mono); letter-spacing: .06em; color: var(--ink); }
.topbar nav { display: flex; gap: 22px; font-size: 14px; color: var(--muted); }
.topbar nav a { text-decoration: none; }
.topbar nav a:hover { color: var(--accent); }

main { width: min(1400px, 100% - 32px); margin: 0 auto; padding: 48px 0 16px; }

/* Masthead */
.masthead { text-align: center; max-width: 780px; margin: 0 auto 44px; }
.kicker { margin: 0; font: 500 12px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.masthead h1 { margin: 14px 0 16px; font: 500 clamp(44px, 6.4vw, 84px)/.95 var(--serif); letter-spacing: -.035em; }
.masthead h1 em { font-style: italic; background: linear-gradient(transparent 62%, var(--highlight) 62% 92%, transparent 92%); padding: 0 .06em; }
.standfirst { margin: 0 auto; max-width: 600px; font: 400 19px/1.5 var(--serif); color: var(--muted); }

/* Workspace */
.workspace { display: grid; grid-template-columns: 300px minmax(0, 1fr) 360px; grid-template-areas: "library brief ask"; gap: 20px; align-items: start; }
.library { grid-area: library; }
.brief { grid-area: brief; }
.ask { grid-area: ask; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding-bottom: 12px; margin-bottom: 16px; border-bottom: 2px solid var(--ink); }
.section-head h2 { margin: 0; font: 600 22px var(--serif); letter-spacing: -.01em; }
.count { font: 500 11px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }

label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 500; color: var(--muted); }
textarea, input, select { width: 100%; padding: 10px 12px; background: var(--sheet); border: 1px solid var(--line-strong); border-radius: 8px; font-size: 14px; }
textarea { resize: vertical; line-height: 1.5; font-family: var(--mono); font-size: 12.5px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 9px 15px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--sheet); font-size: 14px; font-weight: 500; transition: background .15s, border-color .15s; }
.btn:hover:not(:disabled) { border-color: var(--ink); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--sheet); }
.btn.primary:hover:not(:disabled) { background: #174a37; border-color: #174a37; }
.collect .btn { width: 100%; margin-top: 10px; }
.note { margin: 8px 0 0; font-size: 12.5px; color: var(--faint); }
.alt-actions { margin-top: 18px; padding-top: 14px; border-top: 1px dashed var(--line-strong); display: grid; gap: 10px; }
.link { padding: 0; border: 0; background: none; text-align: left; font-size: 14px; font-weight: 500; color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
details summary { cursor: pointer; font-size: 14px; font-weight: 500; color: var(--muted); }
.paste { display: grid; gap: 4px; margin-top: 12px; }
.paste label { margin-top: 6px; }
.paste .btn { margin-top: 8px; }
.status { min-height: 20px; margin: 14px 0 6px; font-size: 13px; color: var(--accent); }
.status.error { color: #a1321c; }

.sources { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.source { position: relative; scroll-margin-top: 24px; display: grid; grid-template-columns: 28px 1fr; gap: 10px; padding: 12px 12px 12px 10px; background: var(--sheet); border: 1px solid var(--line); border-radius: 10px; transition: border-color .2s, box-shadow .2s, transform .2s; }
.source.is-lit { border-color: var(--c); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c) 18%, transparent); transform: translateX(3px); }
.source-num { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 6px; background: var(--c); color: #fff; font: 600 12px var(--mono); }
.source strong { display: block; font: 600 15px/1.3 var(--serif); }
.source p { margin: 3px 0 0; font: 11.5px var(--mono); color: var(--faint); overflow-wrap: anywhere; }
.source a { display: inline-block; margin-top: 6px; font-size: 12.5px; color: var(--c); text-underline-offset: 3px; }

/* Brief */
.brief { background: var(--sheet); border: 1px solid var(--line); border-radius: 4px; padding: 36px clamp(22px, 4vw, 52px) 40px; box-shadow: 0 1px 0 var(--line), 0 24px 50px -30px rgba(60, 45, 20, .25); }
.brief-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.dateline { margin: 0 0 6px; font: 500 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--faint); }
.brief-head h2 { margin: 0; font: 500 38px/1.05 var(--serif); letter-spacing: -.025em; }
.brief-meta { margin: 8px 0 0; font-size: 13px; color: var(--muted); }
.findings { list-style: none; margin: 0; padding: 0; }
.finding { display: grid; grid-template-columns: 44px 1fr; gap: 8px; padding: 22px 0; border-bottom: 1px solid var(--line); transition: opacity .2s; animation: rise .45s cubic-bezier(.2, .7, .2, 1) both; animation-delay: calc(var(--i) * 70ms); }
.finding:last-child { border-bottom: 0; }
.finding.is-dim { opacity: .28; }
.finding-num { font: italic 400 30px/1 var(--serif); color: var(--faint); }
.finding blockquote { margin: 0; font: 400 19px/1.6 var(--serif); }
.finding.is-lit blockquote { background: linear-gradient(transparent 8%, color-mix(in srgb, var(--highlight) 70%, transparent) 8% 92%, transparent 92%); }
.finding footer { margin-top: 8px; font-size: 13px; color: var(--muted); }
.findings .empty { padding: 40px 0 10px; font: italic 18px var(--serif); color: var(--faint); }

.cite { display: inline-flex; align-items: center; justify-content: center; min-width: 20px; height: 18px; margin: 0 2px; padding: 0 5px; border-radius: 4px; background: var(--c, var(--accent)); color: #fff; font: 600 10.5px var(--mono); text-decoration: none; vertical-align: 2px; transition: filter .15s; }
.cite:hover { filter: brightness(1.2); }

/* Ask */
.ask { position: sticky; top: 16px; }
.thread { display: grid; gap: 14px; max-height: 460px; overflow: auto; padding: 2px 2px 12px; }
.msg { font-size: 14.5px; line-height: 1.6; animation: rise .3s ease-out both; }
.msg.user { justify-self: end; max-width: 88%; padding: 9px 13px; background: var(--ink); color: var(--sheet); border-radius: 14px 14px 4px 14px; }
.msg.assistant { padding-left: 14px; border-left: 2px solid var(--accent); font-family: var(--serif); font-size: 16.5px; }
.msg.assistant p { margin: 0 0 8px; }
.msg.assistant p:last-child { margin-bottom: 0; }
.msg.assistant blockquote { margin: 8px 0; padding: 8px 12px; background: var(--sheet); border: 1px solid var(--line); border-radius: 8px; font-size: 15.5px; }
.msg.assistant small { display: block; margin-top: 6px; font: 12.5px var(--sans); color: var(--faint); }
.msg.pending { color: var(--faint); font-style: italic; }
.suggestions { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.suggestions button { padding: 6px 10px; border: 1px solid var(--line-strong); border-radius: 999px; background: transparent; font-size: 12.5px; color: var(--muted); transition: border-color .15s, color .15s; }
.suggestions button:hover { border-color: var(--accent); color: var(--accent); }
.composer { display: flex; gap: 8px; }
.composer input { min-width: 0; }
.mode { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.mode label { margin: 0; white-space: nowrap; font-size: 12.5px; }
.mode select { padding: 6px 10px; font-size: 13px; }

/* Colophon */
.colophon { margin-top: 64px; padding-top: 22px; border-top: 2px solid var(--ink); }
.colophon h2 { margin: 0 0 18px; font: 600 22px var(--serif); }
.colophon ol { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; counter-reset: step; }
.colophon li { counter-increment: step; font-size: 14px; color: var(--muted); }
.colophon li::before { content: counter(step, decimal-leading-zero); display: block; margin-bottom: 8px; font: italic 28px/1 var(--serif); color: var(--accent); }
.colophon b { color: var(--ink); font-weight: 600; }

.footer { width: min(1400px, 100% - 32px); margin: 44px auto 0; padding: 20px 0 36px; border-top: 1px solid var(--line-strong); display: flex; justify-content: space-between; gap: 16px; font-size: 13px; color: var(--muted); }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--accent); }

@keyframes rise { from { opacity: 0; transform: translateY(6px); } }

@media (max-width: 1240px) {
  .workspace { grid-template-columns: 290px minmax(0, 1fr); grid-template-areas: "library brief" "library ask"; }
  .ask { position: static; }
}
@media (max-width: 820px) {
  main { padding-top: 32px; }
  .masthead { margin-bottom: 28px; }
  .standfirst { font-size: 17px; }
  .workspace { grid-template-columns: 1fr; grid-template-areas: "library" "brief" "ask"; }
  .brief { padding: 24px 18px 28px; }
  .brief-head { flex-direction: column; }
  .brief-head h2 { font-size: 30px; }
  .finding { grid-template-columns: 34px 1fr; }
  .finding blockquote { font-size: 17px; }
  .colophon ol { grid-template-columns: 1fr 1fr; }
  .footer { flex-direction: column; }
}
@media (max-width: 520px) {
  .colophon ol { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}