/* ==========================================================================
   TraceMark — portfolio case study
   Dark, restrained, forensic/terminal aesthetic.
   Accent palette subtly references the CTA/Chicago homepage (flag blue).
   ========================================================================== */

:root {
  --bg: #0a0e14;
  --bg-2: #0e1420;
  --panel: #111827;
  --panel-2: #161f30;
  --line: #223047;
  --line-soft: #1a2638;
  --text: #e8ecf2;
  --muted: #8fa0b5;
  --muted-2: #5f7186;
  --accent: #41b6e6;        /* Chicago flag blue */
  --accent-dim: #2b7ea6;
  --red: #e4002b;           /* Chicago flag red */
  --good: #3ddc84;
  --amber: #ffb324;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1000px 500px at 75% -10%, #132238 0%, transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
}

.mono { font-family: var(--mono); }

a { color: var(--accent); }
a:hover { color: #8ed2f5; }

::selection { background: rgba(65,182,230,0.28); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--accent);
  color: #06121f;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 700;
  z-index: 100;
}
.skip-link:focus { left: 8px; }

/* ---------- breadcrumb ---------- */
.crumb {
  display: flex;
  gap: 10px;
  align-items: center;
  max-width: 1080px;
  margin: 0 auto;
  padding: 22px 24px 0;
  font-size: 0.82rem;
  color: var(--muted);
  font-family: var(--mono);
}
.crumb a { text-decoration: none; color: var(--muted); }
.crumb a:hover { color: var(--accent); }
.crumb .here { color: var(--text); }

/* ---------- hero ---------- */
.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(48px, 9vh, 96px) 24px 32px;
}
.eyebrow {
  color: var(--accent);
  letter-spacing: 0.28em;
  font-size: 0.7rem;
  text-transform: uppercase;
}
.hero-title {
  margin-top: 20px;
  font-size: clamp(2rem, 5.6vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  max-width: 16ch;
}
.hero-title .accent { color: var(--accent); }
.hero-sub { margin-top: 18px; font-size: clamp(1rem, 2.2vw, 1.25rem); color: var(--text); }
.hero-desc { margin-top: 12px; color: var(--muted); max-width: 60ch; }
.hero-cta { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--accent);
  color: #06121f;
}
.btn-primary:hover { box-shadow: 0 12px 28px rgba(65,182,230,0.3); }
.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); }
.btn-small { padding: 8px 16px; font-size: 0.8rem; background: transparent; border: 1px solid var(--line); color: var(--muted); cursor: pointer; }
.btn-small:hover { color: var(--accent); border-color: var(--accent); transform: none; }

/* hero demo */
.hero-demo {
  margin-top: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 22px;
  position: relative;
  overflow: hidden;
}
.hero-demo::before {
  content: '';
  position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 3px, rgba(0,0,0,0.12) 3px, rgba(0,0,0,0.12) 4px);
  pointer-events: none;
}
.hero-demo-caption {
  color: var(--muted-2);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.keyline { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.keyline-label { font-size: 0.66rem; letter-spacing: 0.2em; color: var(--accent-dim); }
.keyline-bits { font-size: 1.05rem; letter-spacing: 0.5em; color: var(--amber); }
.keyline-arrow { color: var(--muted-2); }
.sentence {
  font-size: clamp(1.05rem, 2.6vw, 1.45rem);
  color: var(--text);
  min-height: 1.6em;
}
.sentence .hl { background: rgba(255,179,36,0.18); border-bottom: 2px solid var(--amber); padding: 0 2px; border-radius: 3px; }
.sentence .hl-good { background: rgba(61,220,132,0.16); border-bottom: 2px solid var(--good); }
.hero-note { margin-top: 12px; color: var(--muted); font-size: 0.9rem; min-height: 1.4em; }
.hero-controls { margin-top: 16px; }

/* ---------- sections ---------- */
.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(48px, 8vh, 88px) 24px;
  transition: opacity 0.6s ease, transform 0.6s ease;
}
html:not(.no-js) .section.reveal-pending { opacity: 0; transform: translateY(14px); }
.section.visible { opacity: 1; transform: none; }

/* no-JS / no-IO failsafe: content is always readable */
html.no-js .section,
html.no-js .bar-fill,
html.no-js .exp-gauge-fill { opacity: 1; transform: none; }
html.no-js .bar-fill { width: 100%; }

.section-title {
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.time-jump { color: var(--accent); letter-spacing: 0.08em; }
.prose { margin-top: 16px; color: var(--muted); max-width: 70ch; }
.prose strong { color: var(--text); }
.prose.lead { font-size: 1.1rem; color: var(--text); }
.prose.small { font-size: 0.86rem; }
.prose.center { text-align: center; margin: 24px auto; }
.center { text-align: center; }

/* ---------- pipeline ---------- */
.pipeline {
  display: flex;
  align-items: stretch;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.stage {
  flex: 1 1 130px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 16px 12px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.stage b { font-size: 0.9rem; }
.stage small { color: var(--muted-2); font-size: 0.72rem; display: block; margin-top: 3px; }
.stage-icon { font-size: 1.5rem; }
.stage.hot { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.flow { align-self: center; color: var(--muted-2); font-size: 1.1rem; }
.pipeline-caption { margin-top: 18px; color: var(--accent-dim); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; }

/* ---------- fingerprint demo ---------- */
.demo-controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 24px; }
.seg {
  padding: 9px 20px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}
.seg:hover { color: var(--text); }
.seg-on { background: var(--accent); border-color: var(--accent); color: #06121f; }
.toggle { display: flex; align-items: center; gap: 8px; margin-left: 8px; color: var(--muted); font-size: 0.85rem; cursor: pointer; }
.toggle input { accent-color: var(--accent); width: 16px; height: 16px; }

.demo-stage {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 28px 24px;
  position: relative;
}
.bits-strip {
  font-size: 0.9rem;
  letter-spacing: 0.35em;
  color: var(--accent-dim);
  margin-bottom: 18px;
  min-height: 1.2em;
}
.demo-text { font-size: clamp(1rem, 2vw, 1.15rem); line-height: 2.1; }
.opp { border-radius: 4px; transition: background 0.25s ease, box-shadow 0.25s ease; padding: 1px 2px; }
.opp.flipped { background: rgba(65,182,230,0.14); box-shadow: 0 0 0 1px var(--accent); cursor: default; }
.opp-badge {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 1px 6px;
  margin-left: 6px;
  vertical-align: middle;
  white-space: nowrap;
}
.demo-caption { margin-top: 16px; color: var(--muted-2); font-size: 0.72rem; letter-spacing: 0.06em; }

/* ---------- detector ---------- */
.doc-card {
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  padding: 18px 20px;
}
.doc-head { color: var(--muted-2); font-size: 0.7rem; letter-spacing: 0.2em; margin-bottom: 12px; }
.doc-card p { font-size: 0.95rem; color: var(--text); line-height: 1.8; }

.detector { margin-top: 24px; display: none; }
.detector.on { display: block; }
.det-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.det-label { color: var(--muted-2); font-size: 0.7rem; letter-spacing: 0.18em; }
.det-bits { font-size: 1rem; letter-spacing: 0.3em; color: var(--amber); min-height: 1.4em; }
.det-cands { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.cand-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: var(--panel);
}
.cand-id { flex: 0 0 140px; font-family: var(--mono); font-size: 0.85rem; color: var(--muted); }
.cand-bar-track { flex: 1; height: 14px; background: var(--panel-2); border-radius: 7px; overflow: hidden; }
.cand-bar { height: 100%; width: 0; background: var(--muted-2); border-radius: 7px; transition: width 0.7s cubic-bezier(0.2, 0.7, 0.3, 1); }
.cand-pct { flex: 0 0 54px; text-align: right; font-family: var(--mono); font-size: 0.85rem; color: var(--muted); }
.cand-row.match { border-color: var(--good); }
.cand-row.match .cand-bar { background: var(--good); }
.cand-row.match .cand-pct { color: var(--good); font-weight: 700; }
.det-result { margin-top: 18px; }
.det-best {
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  font-weight: 800;
  color: var(--good);
  border: 1px solid var(--good);
  border-radius: var(--radius);
  padding: 14px 18px;
  background: rgba(61,220,132,0.08);
}
.det-distinction {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--panel);
}
.det-distinction .q { color: var(--muted); font-size: 0.9rem; margin-top: 6px; }
.det-distinction .q strong { color: var(--text); }

/* ---------- statistics ---------- */
.stat-grid { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 26px; }
.stat-card {
  flex: 1 1 260px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 22px;
}
.stat-card-good { border-color: rgba(61,220,132,0.5); }
.stat-card-title { color: var(--muted-2); font-size: 0.7rem; letter-spacing: 0.18em; margin-bottom: 14px; }
.bit-row { font-size: 1.05rem; letter-spacing: 0.3em; color: var(--text); margin-bottom: 6px; }
.tick-row { font-size: 1.05rem; letter-spacing: 0.3em; color: var(--muted); }
.tick-row.good { color: var(--good); }
.stat-big { margin-top: 16px; font-size: 1.6rem; font-weight: 800; color: var(--muted); }
.stat-big.good { color: var(--good); }

.underhood { margin-top: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.underhood summary { padding: 14px 18px; cursor: pointer; color: var(--accent); font-weight: 600; }
.underhood summary:hover { color: #8ed2f5; }
.underhood-list { padding: 0 18px 16px; list-style: none; color: var(--muted); font-size: 0.88rem; display: flex; flex-direction: column; gap: 6px; }

/* ---------- research counters ---------- */
.big-counter { margin-top: 28px; font-size: clamp(2.6rem, 9vw, 5.5rem); font-weight: 800; letter-spacing: -0.02em; color: var(--accent); line-height: 1; }
.counter-label { color: var(--muted); margin-top: 6px; }
.corpus-grid { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 30px; }
.corpus-card { flex: 1 1 220px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 22px; }
.corpus-num { font-size: clamp(1.5rem, 3.4vw, 2.3rem); font-weight: 800; color: var(--text); }
.corpus-name { color: var(--muted); margin-top: 8px; font-size: 0.92rem; }

/* ---------- bars ---------- */
.bars { margin-top: 30px; display: flex; flex-direction: column; gap: 16px; }
.bar-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.bar-label { flex: 0 0 92px; font-size: 0.72rem; letter-spacing: 0.14em; color: var(--muted-2); }
.bar-track { flex: 1 1 200px; height: 26px; background: var(--panel-2); border-radius: 13px; overflow: hidden; }
.bar-fill { height: 100%; width: 0; border-radius: 13px; transition: width 1s cubic-bezier(0.2, 0.7, 0.3, 1); }
.bar-synthetic { background: linear-gradient(90deg, var(--accent-dim), var(--accent)); }
.bar-real { background: linear-gradient(90deg, #5f7186, var(--muted)); }
.bar-val { flex: 0 0 80px; text-align: right; font-size: 0.85rem; color: var(--text); }

/* ---------- reality grid ---------- */
.reality-grid { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 28px; }
.reality-card { flex: 1 1 220px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 26px 22px; }
.reality-big { font-size: clamp(1.6rem, 4vw, 2.6rem); font-weight: 800; color: var(--amber); }
.reality-label { color: var(--muted); margin-top: 10px; font-size: 0.9rem; }

/* ---------- explorer ---------- */
.explorer-controls { display: flex; gap: 24px; flex-wrap: wrap; margin-top: 28px; }
.control { border: 0; padding: 0; min-width: 0; }
.control legend { font-size: 0.7rem; letter-spacing: 0.18em; color: var(--muted-2); margin-bottom: 10px; }
.seg-group { display: flex; gap: 8px; flex-wrap: wrap; }
.explorer-result { margin-top: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 26px; }
.exp-big { font-size: clamp(1.1rem, 2.6vw, 1.6rem); font-weight: 700; }
.exp-gauge { margin-top: 18px; height: 22px; background: var(--panel-2); border-radius: 11px; overflow: hidden; }
.exp-gauge-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent-dim), var(--accent)); transition: width 0.5s ease; border-radius: 11px; }
.exp-value { margin-top: 14px; font-size: clamp(2rem, 6vw, 3.2rem); font-weight: 800; color: var(--accent); }
.exp-note { color: var(--muted-2); font-size: 0.78rem; margin-top: 4px; letter-spacing: 0.08em; }

/* ---------- findings / limits ---------- */
.findings-grid { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 26px; }
.finding { flex: 1 1 220px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 22px; }
.finding-title { color: var(--muted-2); font-size: 0.68rem; letter-spacing: 0.18em; margin-bottom: 10px; }
.finding-big { font-size: clamp(1.4rem, 3vw, 2.1rem); font-weight: 800; color: var(--good); margin-bottom: 8px; }
.finding p { color: var(--muted); font-size: 0.88rem; }

.limits-grid { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 26px; }
.limit { flex: 1 1 260px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 24px; }
.limit-title { color: var(--red); font-size: 0.72rem; letter-spacing: 0.18em; margin-bottom: 12px; }
.limit p { color: var(--muted); font-size: 0.9rem; margin-top: 10px; }
.limit .finding-big { color: var(--red); }
.mini-bars { display: flex; flex-direction: column; gap: 10px; margin: 14px 0 4px; }
.mini-row { display: flex; align-items: center; gap: 10px; }
.mini-label { flex: 0 0 86px; font-size: 0.76rem; color: var(--muted); }
.mini-track { flex: 1; height: 14px; background: var(--panel-2); border-radius: 7px; overflow: hidden; }
.mini-fill { height: 100%; background: linear-gradient(90deg, var(--accent-dim), var(--accent)); border-radius: 7px; }
.mini-val { flex: 0 0 52px; text-align: right; font-size: 0.8rem; }

.canonicalization {
  margin-top: 26px;
  border: 1px solid var(--amber);
  border-radius: var(--radius);
  background: rgba(255,179,36,0.06);
  padding: 18px 20px;
  max-width: 700px;
}
.canonicalization p { color: var(--muted); font-size: 0.92rem; margin-top: 8px; }
.canonicalization strong { color: var(--text); }
.experimental {
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  color: #06121f;
  background: var(--amber);
  border-radius: 4px;
  padding: 2px 8px;
}

/* ---------- engineering ---------- */
.stack { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 7px 14px;
}
.chip:hover { color: var(--accent); border-color: var(--accent); }

.arch { display: flex; gap: 26px; flex-wrap: wrap; margin-top: 34px; }
.arch-col { flex: 1 1 300px; display: flex; flex-direction: column; gap: 8px; }
.arch-title { color: var(--muted-2); font-size: 0.68rem; letter-spacing: 0.2em; margin-bottom: 8px; }
.arch-node {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 12px 14px;
  font-size: 0.9rem;
  color: var(--text);
  transition: border-color 0.2s ease;
}
.arch-node:hover { border-color: var(--accent); }
.arch-node-hot { border-color: var(--accent); color: var(--accent); }
.arch-node-final { border-color: var(--good); color: var(--good); }
.arch-flow { color: var(--muted-2); font-size: 0.72rem; padding-left: 4px; }

.metrics { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 34px; }
.metric { flex: 1 1 200px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 20px; }
.metric-num { font-size: clamp(1.1rem, 2.4vw, 1.6rem); font-weight: 800; color: var(--accent); }
.metric-label { color: var(--muted); font-size: 0.82rem; margin-top: 6px; }

/* ---------- columns / takeaway ---------- */
.columns { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 26px; }
.column { flex: 1 1 240px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 24px; }
.col-title { color: var(--muted-2); font-size: 0.7rem; letter-spacing: 0.18em; margin-bottom: 14px; }
.column ul { list-style: none; display: flex; flex-direction: column; gap: 8px; color: var(--muted); font-size: 0.92rem; }
.column ul li::before { content: '— '; color: var(--accent-dim); }
.lesson {
  margin-top: 18px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

/* ---------- final ---------- */
.final .section-title { margin-bottom: 8px; }
.not-ai {
  margin-top: 26px;
  border: 1px solid var(--red);
  border-radius: var(--radius);
  background: rgba(228,0,43,0.07);
  padding: 16px 18px;
  color: var(--muted);
  font-size: 0.88rem;
  max-width: 720px;
}
.not-ai strong { color: var(--text); }
.final-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }

.foot {
  border-top: 1px solid var(--line-soft);
  margin-top: 40px;
  padding: 30px 24px 60px;
  text-align: center;
  color: var(--muted-2);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .section { opacity: 1; transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 768px) {
  .pipeline { flex-direction: column; }
  .flow { transform: rotate(90deg); }
  .arch { flex-direction: column; }
  .seg-group { gap: 6px; }
  .seg { padding: 9px 14px; }
  .cand-id { flex-basis: 110px; }
}

@media (max-width: 430px) {
  .crumb { flex-wrap: wrap; }
  .hero-cta .btn { width: 100%; text-align: center; }
  .final-cta .btn { width: 100%; text-align: center; }
  .stat-card, .corpus-card, .reality-card, .finding, .limit, .metric { flex-basis: 100%; }
  .bar-label { flex-basis: 100%; }
  .demo-controls { flex-direction: column; align-items: stretch; }
  .toggle { margin-left: 0; }
}

@media (max-width: 320px) {
  .cand-row { flex-wrap: wrap; }
  .cand-id { flex-basis: 100%; }
}