/* Innovation Prior — styles
 * Light/dark via prefers-color-scheme. Responsive: sidebar collapses on mobile.
 * Long-form reading: ~760px main column, generous line-height.
 */

/* ---------- design tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-sidebar: #fafbfc;
  --surface: #ffffff;
  --border: #e4e7eb;
  --border-strong: #d0d5dc;
  --text: #1c2430;
  --text-soft: #54606e;
  --text-faint: #8a95a3;
  --accent: #2563eb;
  --accent-soft: #e8effd;
  --accent-text: #1d4ed8;
  --code-bg: #f4f5f7;
  --error-bg: #fdecea;
  --error-text: #9b1c1c;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, "Apple Color Emoji", sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --sidebar-w: 290px;
  --topbar-h: 56px;
  --reading-w: 760px;

  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --bg-soft: #161b22;
    --bg-sidebar: #11161d;
    --surface: #161b22;
    --border: #232a33;
    --border-strong: #2f3845;
    --text: #e3e8ef;
    --text-soft: #aab3c0;
    --text-faint: #6b7685;
    --accent: #5b9dff;
    --accent-soft: #18283f;
    --accent-text: #8bb8ff;
    --code-bg: #0c1117;
    --error-bg: #2a1416;
    --error-text: #f3a7a3;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.5);
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 8px 14px;
  z-index: 100;
  border-radius: 0 0 6px 0;
}
.skip-link:focus { left: 0; }

.kbd {
  font-family: var(--font-mono);
  font-size: 0.8em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
}

/* ---------- topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 650;
  font-size: 1.02rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 0.85em; }
.topbar-spacer { flex: 1; }

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 38px;
  height: 38px;
  padding: 0 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* ---------- layout ---------- */
.layout {
  display: flex;
  min-height: calc(100vh - var(--topbar-h));
  align-items: stretch;
}

/* ---------- sidebar ---------- */
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  position: sticky;
  top: var(--topbar-h);
  align-self: flex-start;
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 14px 12px 40px;
}
.search-wrap { position: sticky; top: 0; padding-bottom: 12px; background: var(--bg-sidebar); }
#search {
  width: 100%;
  padding: 9px 12px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
}
#search:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

.nav-group { margin-bottom: 4px; }
.nav-group-head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 7px;
}
.nav-group-head:hover { background: var(--bg-soft); color: var(--text); }
.nav-group-head .caret {
  font-size: 0.7rem;
  transition: transform 0.15s ease;
  color: var(--text-faint);
}
.nav-group-head[aria-expanded="true"] .caret { transform: rotate(90deg); }
.nav-group-name { flex: 1; text-align: left; }
.nav-group-count {
  font-size: 0.7rem;
  color: var(--text-faint);
  background: var(--bg-soft);
  border-radius: 10px;
  padding: 1px 7px;
}

.nav-list { list-style: none; margin: 2px 0 8px; padding: 0; }
.nav-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px;
  padding: 0 2px;
}
.nav-link {
  flex: 1;
  display: block;
  padding: 6px 9px;
  border-radius: 7px;
  color: var(--text);
  font-size: 0.875rem;
  line-height: 1.35;
}
.nav-link:hover { background: var(--bg-soft); text-decoration: none; }
.nav-link.is-active {
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 600;
}
.nav-arxiv {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-faint);
  padding: 2px 4px;
  white-space: nowrap;
  flex: 0 0 auto;
}
.nav-arxiv:hover { color: var(--accent-text); }
.nav-empty { color: var(--text-faint); font-size: 0.85rem; padding: 8px; }

.scrim {
  position: fixed;
  inset: var(--topbar-h) 0 0 0;
  background: rgba(8, 12, 18, 0.45);
  z-index: 30;
}

/* ---------- main ---------- */
.main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 40px 32px 96px;
  outline: none;
}

/* hero */
.hero { max-width: var(--reading-w); margin: 0 auto; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0.3em 0 0.4em;
}
.hero .lede {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--text);
}
.hero p { color: var(--text-soft); font-size: 1.02rem; line-height: 1.7; }
.hero strong { color: var(--text); }
.artifact-list { color: var(--text-soft); line-height: 1.7; padding-left: 1.1em; }
.artifact-list li { margin: 0.5em 0; }
.artifact-list strong { color: var(--text); }
.hero-hint { font-size: 0.98rem; }
.hero-meta { color: var(--text-faint); font-size: 0.9rem; border-top: 1px solid var(--border); padding-top: 16px; margin-top: 28px; }
.hero-meta code, .hero-hint code { font-family: var(--font-mono); font-size: 0.85em; background: var(--code-bg); padding: 1px 5px; border-radius: 5px; }

/* article */
.article { max-width: var(--reading-w); margin: 0 auto; }
.article-head { border-bottom: 1px solid var(--border); padding-bottom: 4px; margin-bottom: 26px; }
.article-domain {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin: 0 0 6px;
}
.article-title {
  font-size: clamp(1.6rem, 4vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}
.article-links {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 18px;
  font-size: 0.88rem;
}
.article-slug { font-family: var(--font-mono); color: var(--text-faint); font-size: 0.8rem; }

/* tabs */
.tabs { display: flex; gap: 4px; }
.tab {
  appearance: none;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 9px 14px;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 550;
  color: var(--text-soft);
  cursor: pointer;
  margin-bottom: -1px;
}
.tab:hover { color: var(--text); }
.tab.is-active { color: var(--accent-text); border-bottom-color: var(--accent); }
.tab:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* ---------- status messages ---------- */
.status { padding: 14px 16px; border-radius: 10px; font-size: 0.95rem; }
.status-loading { color: var(--text-faint); }
.status-error { background: var(--error-bg); color: var(--error-text); border: 1px solid color-mix(in srgb, var(--error-text) 30%, transparent); }

/* ---------- markdown content ---------- */
.markdown-body {
  font-family: var(--font-serif);
  font-size: 1.09rem;
  line-height: 1.78;
  color: var(--text);
  word-wrap: break-word;
  overflow-wrap: break-word;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4 {
  font-family: var(--font-sans);
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 1.8em 0 0.6em;
  scroll-margin-top: calc(var(--topbar-h) + 12px);
}
.markdown-body h1 { font-size: 1.7rem; }
.markdown-body h2 {
  font-size: 1.35rem;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}
.markdown-body h3 { font-size: 1.12rem; }
.markdown-body h4 { font-size: 1rem; color: var(--text-soft); }
.markdown-body p { margin: 0 0 1.15em; }
.markdown-body ul, .markdown-body ol { padding-left: 1.5em; margin: 0 0 1.15em; }
.markdown-body li { margin: 0.35em 0; }
.markdown-body li > p { margin-bottom: 0.5em; }
.markdown-body blockquote {
  margin: 1.2em 0;
  padding: 0.4em 1.1em;
  border-left: 3px solid var(--border-strong);
  color: var(--text-soft);
  background: var(--bg-soft);
  border-radius: 0 8px 8px 0;
}
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }
.markdown-body a { text-decoration: underline; text-underline-offset: 2px; }

/* inline code */
.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}
/* code blocks: horizontally scrollable */
.markdown-body pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  margin: 0 0 1.3em;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.6;
  -webkit-overflow-scrolling: touch;
}
.markdown-body pre code {
  font-family: var(--font-mono);
  background: transparent;
  padding: 0;
  font-size: inherit;
  white-space: pre;
}

/* tables */
.markdown-body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 0 0 1.3em;
  font-family: var(--font-sans);
  font-size: 0.92rem;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 7px 12px;
  text-align: left;
}
.markdown-body th { background: var(--bg-soft); font-weight: 650; }

.markdown-body img { max-width: 100%; height: auto; }

/* KaTeX display blocks scroll horizontally if wide */
.markdown-body .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.markdown-body .katex { font-size: 1.04em; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .menu-toggle { display: flex; }
  .sidebar {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    height: calc(100vh - var(--topbar-h));
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    z-index: 35;
    box-shadow: var(--shadow);
  }
  .sidebar.is-open { transform: translateX(0); }
  .main { padding: 28px 20px 80px; }
}

@media (min-width: 901px) {
  .scrim { display: none !important; }
}

@media (max-width: 560px) {
  .main { padding: 22px 16px 64px; }
  .markdown-body { font-size: 1.04rem; }
  .tabs { width: 100%; }
  .tab { flex: 1; padding: 9px 6px; text-align: center; }
}

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

/* ---------- mode switch (Methods | Trajectories) ---------- */
.modes { display: flex; gap: 2px; margin-left: 16px; background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: 8px; padding: 2px; }
.mode-btn { font: inherit; font-size: 0.82rem; font-weight: 600; color: var(--text-soft);
  background: transparent; border: 0; border-radius: 6px; padding: 5px 12px; cursor: pointer; }
.mode-btn:hover { color: var(--text); }
.mode-btn.is-active { background: var(--surface); color: var(--accent-text); box-shadow: var(--shadow); }

/* sidebar sub-label (trajectory finale) */
.nav-link-sub { display: block; font-size: 0.74rem; color: var(--text-faint); margin-top: 1px; }

/* ---------- trajectory view ---------- */
.traj-tag { display: inline-block; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--accent-text); background: var(--accent-soft);
  border-radius: 999px; padding: 2px 10px; }

.traj-step { border: 1px solid var(--border); border-radius: 12px; padding: 8px 22px 4px;
  margin: 0 0 18px; background: var(--surface); }
.traj-step .traj-badge { font-family: var(--font-mono); font-size: 0.74rem; font-weight: 600;
  letter-spacing: 0.02em; text-transform: uppercase; color: var(--text-faint);
  border-bottom: 1px solid var(--border); padding: 8px 0 8px; margin: 0 0 6px; }

/* phase accents down the left edge */
.traj-context  { border-left: 3px solid var(--text-faint); }
.traj-reasoning{ border-left: 3px solid var(--accent); }
.traj-answer   { border-left: 3px solid #16a34a; }
.traj-answer .traj-badge { color: #16a34a; }

/* feedback steps read as "me" speaking back — tinted card */
.traj-feedback { border-left: 3px solid #d97706; background: color-mix(in srgb, #d97706 6%, var(--surface)); }
.traj-feedback .traj-badge { color: #b45309; }

/* reflection: the researcher diagnosing the previous result before the next derivation */
.traj-reflection { border-left: 3px solid #7c3aed; background: color-mix(in srgb, #7c3aed 5%, var(--surface)); }
.traj-reflection .traj-badge { color: #6d28d9; }
.traj-reflection .traj-step-body { font-style: italic; }

/* finale step: the NEW method the trajectory develops (not a baseline) — gold accent */
.traj-step.traj-is-finale { border-left-color: #d4a017; box-shadow: 0 0 0 1px color-mix(in srgb, #d4a017 30%, transparent); }
.traj-step.traj-is-finale .traj-badge { color: #b8860b; }

/* ====================================================================== */
/* Agentic transcripts + Training-data viewer (shared .tx-* components)    */
/* ====================================================================== */

/* meta pills in headers */
.tx-pills { display: inline-flex; flex-wrap: wrap; gap: 6px; vertical-align: middle; }
.tx-pill { display: inline-block; font-size: 0.72rem; font-weight: 600; color: var(--text-soft);
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 999px; padding: 2px 9px; }
.tx-pill-ds { font-family: var(--font-mono); color: var(--accent-text); background: var(--accent-soft);
  border-color: transparent; }
.tx-pill-warn { color: #b45309; background: color-mix(in srgb, #d97706 12%, var(--surface));
  border-color: color-mix(in srgb, #d97706 30%, transparent); }

/* metadata strip above a training example */
.tx-meta { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 18px; }

/* collapsible system-prompt / tools blocks */
.tx-block { border: 1px solid var(--border); border-radius: 10px; background: var(--bg-soft);
  margin: 0 0 14px; padding: 0; }
.tx-block > summary { cursor: pointer; padding: 9px 14px; font-size: 0.8rem; font-weight: 600;
  color: var(--text-soft); list-style-position: inside; }
.tx-block > summary:hover { color: var(--text); }
.tx-block[open] > summary { border-bottom: 1px solid var(--border); }
.tx-block .tx-block-body, .tx-block ul { padding: 4px 16px 10px; margin: 0; }
.tx-tools ul { list-style: none; padding-left: 16px; }
.tx-tools li { margin: 6px 0; font-size: 0.86rem; }
.tx-tools code { font-size: 0.82rem; }
.tx-tool-desc { color: var(--text-soft); }

/* message bubbles */
.tx-transcript { display: block; }
.tx-msg { border: 1px solid var(--border); border-radius: 12px; margin: 0 0 14px;
  background: var(--surface); overflow: hidden; }
.tx-role { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.03em;
  text-transform: uppercase; color: var(--text-faint); padding: 8px 16px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 8px; }
.tx-body { padding: 6px 18px 10px; }
.tx-body > :first-child { margin-top: 6px; }

/* role accents */
.tx-user      { border-left: 3px solid var(--text-faint); }
.tx-assistant { border-left: 3px solid var(--accent); }
.tx-tool      { border-left: 3px solid #0d9488; background: color-mix(in srgb, #0d9488 4%, var(--surface)); }
.tx-tool .tx-role { color: #0f766e; }

/* reasoning fold */
.tx-think { border: 1px dashed color-mix(in srgb, var(--accent) 45%, var(--border));
  border-radius: 9px; background: color-mix(in srgb, var(--accent) 5%, var(--surface));
  margin: 8px 0; padding: 0 14px; }
.tx-think > summary { cursor: pointer; padding: 8px 0; font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.03em; text-transform: uppercase; color: var(--accent-text); }
.tx-think-body { padding: 2px 0 10px; font-size: 0.95em; }
.tx-say { margin: 6px 0; }
.tx-empty { color: var(--text-faint); font-style: italic; }
.tx-step { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-faint);
  text-transform: none; letter-spacing: 0; }

/* tool-call card */
.tx-call { border: 1px solid var(--border-strong); border-radius: 9px; margin: 8px 0;
  background: var(--code-bg); overflow: hidden; }
.tx-call-head { display: flex; align-items: center; gap: 8px; padding: 7px 12px;
  border-bottom: 1px solid var(--border); font-size: 0.8rem; }
.tx-call-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex: none; }
.tx-call-name { font-family: var(--font-mono); font-weight: 700; color: var(--text); }
.tx-call-tag { margin-left: auto; font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--text-faint); }
.tx-call-args { margin: 0; border-radius: 0; }
.tx-call-args code { background: transparent; }

/* per-turn loss badges */
.tx-tag { font-family: var(--font-sans); font-size: 0.66rem; font-weight: 700; letter-spacing: 0.03em;
  text-transform: uppercase; border-radius: 999px; padding: 2px 8px; margin-left: auto; }
.tx-trained { color: #15803d; background: color-mix(in srgb, #16a34a 14%, var(--surface)); }
.tx-masked  { color: var(--text-faint); background: var(--bg-soft); border: 1px solid var(--border); }

/* ---------- training-data dashboard ---------- */
.td-home { max-width: var(--reading-w); }
.td-cards { display: flex; flex-wrap: wrap; gap: 18px; margin: 18px 0; }
.td-card { flex: 1 1 280px; border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px;
  background: var(--surface); }
.td-card h3 { margin: 0 0 8px; font-size: 1rem; font-family: var(--font-mono); }
.td-count { font-family: var(--font-sans); font-size: 0.78rem; font-weight: 500; color: var(--text-faint); }
.td-table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
.td-table th { text-align: left; color: var(--text-faint); font-weight: 600; border-bottom: 1px solid var(--border);
  padding: 4px 6px; }
.td-table td { padding: 4px 6px; border-bottom: 1px solid var(--border); }
.td-table td:last-child { text-align: right; font-variant-numeric: tabular-nums; color: var(--text-soft); }
.td-note { font-size: 0.84rem; color: var(--text-soft); }