/* ==========================================================================
   AI SCAN — shared styles (static mockup)
   "Full escurves": warm paper + faint technical grid · near-black ink ·
   one rust accent · condensed-sans headlines · mono kickers/annotations
   ========================================================================== */

:root {
  --paper: #f6f1e5;
  --paper-raise: #fbf7ee;
  --grid: rgba(28, 23, 15, 0.055);
  --ink: #1c170f;
  --ink-soft: #4a4438;
  --ink-faint: #6e6452;
  --edge: rgba(28, 23, 15, 0.8);
  --edge-soft: rgba(28, 23, 15, 0.22);
  --rust: #b3402a;
  --rust-deep: #93331f;
  --rust-wash: rgba(179, 64, 42, 0.08);
  --on-rust: #f6f1e5;
  --layer-h: 64px;
  --layer-gap: 10px;
  /* radius system: --radius for every container/input/card; --radius-pill
     ONLY for pill-shaped interactive elements (nav pills, marquee player
     chips, the chat launch button and its pill-styled kin) */
  --radius: 2px;
  --radius-pill: 999px;
  --max: 1060px;
  --font: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --head: "Avenir Next Condensed", "Arial Narrow", "Helvetica Neue", Arial,
    sans-serif;
  --ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 36px 36px;
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--rust); color: var(--on-rust); }

a { color: var(--ink); text-decoration: none; }
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- type primitives ---------- */

.kicker {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}

.kicker--rust { color: var(--rust); }

.footnote {
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--ink-faint);
  line-height: 1.55;
  max-width: 62ch;
}

/* ==========================================================================
   PILL CHAPTER NAV (all pages)
   ========================================================================== */

.chapter-nav {
  border-bottom: 1px solid var(--edge-soft);
  background: var(--paper);
}

.chapter-nav .wrap {
  display: flex;
  gap: 8px;
  padding-top: 14px;
  padding-bottom: 14px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.chapter-nav .wrap::-webkit-scrollbar { display: none; }

/* wordmark at the head of the nav bar — links home, condensed head face */
.nav-wordmark {
  flex: none;
  display: inline-flex;
  align-items: center;
  margin-right: 10px;
  font-family: var(--head);
  font-stretch: condensed;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink);
}

.nav-wordmark:hover { color: var(--rust); }

.pill {
  flex: none;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  transition: background 0.15s ease, color 0.15s ease,
    border-color 0.15s ease;
}

a.pill:hover {
  background: var(--rust-wash);
  border-color: var(--rust);
  color: var(--rust);
}

.pill.is-current {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.pill--soon {
  border-style: dashed;
  border-color: var(--edge-soft);
  color: var(--ink-faint);
  cursor: default;
}

/* ==========================================================================
   HOMEPAGE
   ========================================================================== */

.hero {
  padding: 72px 0 40px;
}

.hero h1 {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: clamp(56px, 10vw, 104px);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 0.96;
  text-transform: uppercase;
}

.hero .subtitle {
  margin-top: 20px;
  font-family: var(--mono);
  font-size: clamp(11px, 1.8vw, 13px);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.hero .byline {
  margin-top: 14px;
  font-size: 13.5px;
  color: var(--ink-faint);
}

.hero .byline a {
  color: var(--ink-soft);
  border-bottom: 1px solid var(--edge-soft);
  padding-bottom: 1px;
}

.hero .byline a:hover { color: var(--rust); border-color: var(--rust); }

/* ---------- the diagram ---------- */

.diagram-section {
  padding: 40px 0 96px;
}

.diagram-wrap {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 48px;
  align-items: center;
}

/* summary-card slot (desktop) — min-height is raised at runtime to the
   tallest card so hover swaps never shift layout; content crossfades */
.card-slot {
  min-height: 380px;
  display: flex;
  align-items: center;
  transition: opacity 0.12s ease;
}

.card-slot.is-fading { opacity: 0; }

/* inside the slot the crossfade replaces the entry animation — replaying
   cardIn on every innerHTML swap is what caused the flash */
.card-slot .layer-card { animation: none; }

.layer-card {
  width: 100%;
  background: var(--paper-raise);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 4px 4px 0 rgba(28, 23, 15, 0.1);
  animation: cardIn 0.25s ease both;
}

.layer-card--hint {
  background: transparent;
  border: 1px dashed var(--edge-soft);
  box-shadow: none;
  color: var(--ink-faint);
  font-size: 13.5px;
  text-align: center;
  padding: 40px 24px;
}

.lc-top { display: flex; align-items: baseline; gap: 12px; margin-bottom: 12px; }

.lc-n {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--rust);
}

.lc-title {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.lc-what { font-size: 14px; color: var(--ink-soft); line-height: 1.55; }

.lc-label {
  margin-top: 18px;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.lc-chips { display: flex; flex-wrap: wrap; gap: 6px; }

.lc-chips span {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius-pill);
  padding: 3px 11px;
}

.lc-margin { font-size: 13.5px; color: var(--ink-soft); line-height: 1.5; }

.lc-go {
  display: inline-block;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--rust);
}

.lc-go:hover { text-decoration: underline; text-underline-offset: 3px; }

.lc-go--soon {
  color: var(--ink-faint);
  font-weight: 400;
  font-style: italic;
  letter-spacing: 0;
  cursor: default;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* stack + brackets share one row template so brackets span exactly */
.stack-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 226px;
  gap: 0 22px;
}

.stack,
.brackets {
  display: grid;
  grid-template-rows: repeat(6, var(--layer-h));
  row-gap: var(--layer-gap);
}

.layer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  position: relative;
  background: var(--paper-raise);
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  font-family: var(--head);
  font-stretch: condensed;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  opacity: 0;
  animation: layerRise 0.55s cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
}

.layer .layer-n {
  position: absolute;
  left: 18px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--ink-faint);
  letter-spacing: 0;
}

.layer:hover,
.layer.is-armed {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(28, 23, 15, 0.18);
}

.layer--rust {
  background: var(--rust);
  border-color: var(--ink);
  color: var(--on-rust);
}

.layer--rust .layer-n { color: rgba(246, 241, 229, 0.7); }

.layer--rust:hover,
.layer--rust.is-armed {
  box-shadow: 4px 4px 0 rgba(179, 64, 42, 0.3);
}

/* build-in: bottom layer first (DOM is top-first) */
.layer:nth-child(6) { animation-delay: 0.05s; }
.layer:nth-child(5) { animation-delay: 0.14s; }
.layer:nth-child(4) { animation-delay: 0.23s; }
.layer:nth-child(3) { animation-delay: 0.32s; }
.layer:nth-child(2) { animation-delay: 0.41s; }
.layer:nth-child(1) { animation-delay: 0.5s; }

@keyframes layerRise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

/* margin-regime brackets — thin ink lines + mono labels */
.bracket {
  display: flex;
  align-items: center;
  gap: 14px;
  opacity: 0;
  animation: bracketIn 0.6s ease 0.85s forwards;
}

.bracket--top { grid-row: 1 / 3; }
.bracket--bottom { grid-row: 4 / 7; }

.bracket::before {
  content: "";
  align-self: stretch;
  width: 11px;
  margin: 5px 0;
  border: 1px solid var(--ink);
  border-left: none;
  border-radius: 0;
  flex: none;
}

.bracket--rust::before { border-color: var(--rust); }

.bracket-text b {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.4;
  text-transform: uppercase;
  color: var(--ink);
}

.bracket--rust .bracket-text b { color: var(--rust); }

.bracket-text span {
  display: block;
  margin-top: 4px;
  font-size: 11.5px;
  color: var(--ink-faint);
  line-height: 1.45;
}

@keyframes bracketIn {
  from { opacity: 0; transform: translateX(-6px); }
  to { opacity: 1; transform: none; }
}

/* mobile / narrow: tapped-layer card below the diagram */
.card-mobile { display: none; margin-top: 22px; }
.card-mobile.show { display: block; }

/* ---------- thesis chapters ---------- */

.chapters {
  border-top: 1px solid var(--edge-soft);
  padding: 88px 0 40px;
}

.chapter {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 28px;
  max-width: 820px;
  margin: 0 auto 84px;
}

.chapter-n {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--rust);
  padding-top: 8px;
}

.chapter h2 {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: clamp(28px, 4.6vw, 40px);
  font-weight: 800;
  letter-spacing: -0.005em;
  line-height: 1.08;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.chapter p {
  color: var(--ink-soft);
  font-size: 16.5px;
  line-height: 1.7;
  max-width: 60ch;
}

.chapter p + p { margin-top: 14px; }

.chapter .go {
  display: inline-block;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--rust);
}

.chapter .go:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ==========================================================================
   LAYER PAGES
   ========================================================================== */

.topbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--edge-soft);
}

.topbar-right { display: flex; align-items: center; gap: 14px; }

.topbar-pos {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
}

/* mini stack position indicator (bottom = layer 01, left) */
.stack-dots { display: flex; gap: 3px; }

.stack-dots i {
  width: 14px;
  height: 5px;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--edge);
}

.stack-dots i.on { background: var(--rust); border-color: var(--rust); }

.layer-hero { padding: 76px 0 30px; }

.layer-hero h1 {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: clamp(40px, 7.6vw, 72px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.02;
  text-transform: uppercase;
  max-width: 18ch;
}

.layer-hero .lede {
  margin-top: 22px;
  font-size: clamp(17px, 2.4vw, 20px);
  color: var(--ink-soft);
  line-height: 1.65;
  max-width: 58ch;
}

.section {
  padding: 60px 0;
  border-top: 1px solid var(--edge-soft);
}

.section h2 {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: clamp(26px, 4.2vw, 38px);
  font-weight: 800;
  letter-spacing: -0.005em;
  line-height: 1.1;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.section > .wrap > p,
.prose p {
  color: var(--ink-soft);
  font-size: 16.5px;
  line-height: 1.7;
  max-width: 62ch;
}

.prose p + p { margin-top: 14px; }

.prose h3 {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 30px 0 10px;
}

.prose .pull {
  margin: 26px 0;
  padding-left: 20px;
  border-left: 2px solid var(--rust);
  font-size: 18px;
  font-style: italic;
  line-height: 1.55;
  color: var(--ink);
  max-width: 54ch;
}

/* ---------- charts as annotated field-guide figures ---------- */

.chart-card {
  margin-top: 28px;
  background: var(--paper-raise);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  padding: 26px 22px 18px;
}

.chart-title {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.chart-sub {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 4px;
}

.chart-scroll { overflow-x: auto; margin-top: 14px; }

/* height cap keeps headline + setup line + figure inside one viewport on
   phones and 13" laptops; the svg scales via viewBox (meet), so a bound
   cap letterboxes horizontally instead of cropping */
.chart-scroll svg {
  display: block;
  min-width: 640px;
  width: 100%;
  height: auto;
  max-height: clamp(240px, 46vh, 420px);
  font-family: var(--ui);
}

/* the one-line setup between the section headline and the figure */
.chart-setup {
  color: var(--ink-soft);
  font-size: 16.5px;
  line-height: 1.7;
  max-width: 62ch;
}

/* explanatory prose moved below the figure */
.chart-follow { margin-top: 28px; }

.chart-note {
  margin-top: 12px;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.chart-note b {
  font-family: var(--mono);
  color: var(--rust);
  font-weight: 700;
  letter-spacing: 0.12em;
}

/* svg helpers — ink lines on the paper grid */
.grid-line { stroke: rgba(28, 23, 15, 0.1); stroke-width: 1; }
.axis-text {
  fill: var(--ink-faint);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
}
.line-ink { stroke: var(--ink); stroke-width: 2.25; fill: none; }
.line-rust { stroke: var(--rust); stroke-width: 2.25; fill: none; }
.ref-line {
  stroke: var(--ink-soft);
  stroke-width: 1;
  stroke-dasharray: 4 4;
  fill: none;
}
.ref-label {
  fill: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}
.anno-text {
  fill: var(--ink);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.anno-text--rust { fill: var(--rust); }
.anno-lead { stroke: var(--ink); stroke-width: 1; fill: none; }
.anno-lead--rust { stroke: var(--rust); }
.bar-paper { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; }
.bar-rust { fill: var(--rust); stroke: var(--ink); stroke-width: 1.5; }
.bar-label {
  fill: var(--ink);
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 700;
}
.bar-cat {
  fill: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
}

/* ---------- follow-the-dollar strip ---------- */

.dollar-scroll { overflow-x: auto; margin-top: 26px; padding-bottom: 6px; }

.dollar-strip {
  display: flex;
  gap: 4px;
  min-width: 660px;
}

.seg {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.seg-bar {
  height: 64px;
  border-radius: var(--radius);
  background: var(--paper-raise);
  border: 1px solid var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
}

.seg--active .seg-bar {
  background: var(--rust);
  border-color: var(--ink);
  color: var(--on-rust);
  font-weight: 700;
}

.seg-name {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  text-align: center;
  line-height: 1.35;
}

.seg--active .seg-name { color: var(--rust); font-weight: 700; }

.dollar-read {
  margin-top: 18px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 60ch;
}

/* ---------- key players ---------- */

.players {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}

.player {
  background: var(--paper-raise);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  padding: 18px;
}

.player b {
  display: block;
  font-family: var(--head);
  font-stretch: condensed;
  font-size: 16px;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.player em {
  display: block;
  font-style: normal;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 3px 0 10px;
}

.player p { font-size: 13.5px; color: var(--ink-soft); line-height: 1.5; }

/* ---------- "My read" ---------- */

.myread {
  margin-top: 8px;
  background: var(--rust-wash);
  border: 1px solid var(--ink);
  border-left: 3px solid var(--rust);
  border-radius: var(--radius);
  padding: 30px 32px;
  max-width: 760px;
}

.myread .kicker { color: var(--rust); margin-bottom: 16px; }

.myread p {
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink);
  max-width: 58ch;
}

.myread p + p { margin-top: 12px; }

.myread .sig {
  margin-top: 20px;
  font-size: 13.5px;
  font-style: italic;
  color: var(--ink-soft);
}

/* ---------- prev / next (editorial, field-guide typographic) ---------- */

.pn-edit {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px 28px;
  padding: 56px 0 84px;
  border-top: 1px solid var(--edge-soft);
}

.pn-edit .pn-back {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.pn-edit .pn-back:hover { color: var(--rust); }

.pn-edit .pn-next {
  margin-left: auto;
  text-align: right;
  max-width: 34ch;
}

.pn-edit .pn-kicker {
  display: block;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 6px;
}

.pn-edit .pn-line {
  font-family: var(--font);
  font-size: clamp(19px, 3vw, 24px);
  font-style: italic;
  line-height: 1.35;
  color: var(--ink);
}

.pn-edit .pn-next:hover .pn-line {
  color: var(--rust);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--edge-soft);
  padding: 36px 0 110px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: baseline;
  justify-content: space-between;
  font-size: 13px;
  color: var(--ink-faint);
}

.footer a { color: var(--ink-soft); border-bottom: 1px solid var(--edge-soft); }
.footer a:hover { color: var(--rust); border-color: var(--rust); }

/* ==========================================================================
   CHAT WIDGET (visual mock, injected by mock.js)
   ========================================================================== */

.chat-fab {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 60;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius-pill);
  padding: 12px 20px;
  background: var(--rust);
  color: var(--on-rust);
  font-family: var(--head);
  font-stretch: condensed;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(28, 23, 15, 0.18);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.chat-fab:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(28, 23, 15, 0.18);
}

.chat-panel {
  position: fixed;
  right: 22px;
  bottom: 80px;
  z-index: 60;
  width: 348px;
  max-width: calc(100vw - 32px);
  background: var(--paper-raise);
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 8px 8px 0 rgba(28, 23, 15, 0.12);
  animation: cardIn 0.2s ease both;
}

.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--edge-soft);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--ink);
}

.chat-close {
  border: none;
  background: none;
  color: var(--ink-faint);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
}

.chat-close:hover { color: var(--rust); }

.chat-log {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 320px;
  overflow-y: auto;
}

.msg {
  font-family: var(--ui);
  font-size: 13.5px;
  line-height: 1.55;
  padding: 10px 14px;
  border-radius: var(--radius);
  max-width: 88%;
}

.msg--user {
  align-self: flex-end;
  background: var(--paper);
  border: 1px solid var(--ink);
  color: var(--ink);
}

.msg--ai {
  align-self: flex-start;
  background: var(--paper-raise);
  border: 1px solid var(--edge-soft);
  color: var(--ink-soft);
}

.msg--ai a { color: var(--rust); text-decoration: underline; text-underline-offset: 2px; }

.chat-form {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--edge-soft);
}

.chat-form input {
  flex: 1;
  min-width: 0;
  background: var(--paper);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-family: var(--ui);
  font-size: 13.5px;
  color: var(--ink);
}

.chat-form input::placeholder { color: var(--ink-faint); }

.chat-form input:focus { outline: none; border-color: var(--rust); }

.chat-form button {
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  width: 40px;
  background: var(--rust);
  color: var(--on-rust);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.chat-note {
  padding: 8px 16px 12px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  text-align: center;
}

.chat-note b { color: var(--rust); font-weight: 700; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 980px) {
  .diagram-wrap { grid-template-columns: 1fr; gap: 0; }
  .card-slot { display: none; }
  .stack-grid { grid-template-columns: minmax(0, 1fr) 118px; gap: 0 12px; }
  .bracket { gap: 8px; }
  .bracket::before { width: 8px; }
  .bracket-text b { font-size: 9px; letter-spacing: 0.1em; }
  .bracket-text span { display: none; }
  .chapter { grid-template-columns: 1fr; gap: 10px; margin-bottom: 64px; }
}

@media (max-width: 560px) {
  :root { --layer-h: 56px; --layer-gap: 8px; }
  .wrap { padding: 0 18px; }
  .hero { padding: 48px 0 24px; }
  .layer { font-size: 12px; letter-spacing: 0.05em; padding: 0 10px 0 32px; }
  .layer .layer-n { left: 10px; font-size: 9.5px; }
  .stack-grid { grid-template-columns: minmax(0, 1fr) 96px; }
  .myread { padding: 22px 20px; }
  .myread p { font-size: 16px; }
  .pn-edit .pn-next { margin-left: 0; text-align: left; max-width: none; }
  .topbar-pos { display: none; }
  .chapter-nav .wrap { padding-top: 12px; padding-bottom: 12px; }
}

/* ---------- motion preferences ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .layer, .bracket, .layer-card, .chat-panel {
    animation: none;
    opacity: 1;
    transform: none;
  }
  .layer, .pn-edit a, .chat-fab, .pill, .card-slot { transition: none; }
}

/* ==========================================================================
   PRODUCTION COMPONENTS
   Classes added for the live site, appended below the approved mockup
   styles. Everything here reuses the design tokens defined in :root above.
   ========================================================================== */

/* ---------- sources note (end-of-page citations block) ---------- */

.sources-note {
  border-top: 1px solid var(--edge-soft);
  margin-top: 44px;
  padding-top: 26px;
  font-size: 0.85rem;
  color: var(--ink-faint);
  line-height: 1.6;
  max-width: 62ch;
}

.sources-note ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sources-note li + li { margin-top: 6px; }

.sources-note a {
  color: var(--ink-soft);
  border-bottom: 1px solid var(--edge-soft);
  padding-bottom: 1px;
}

.sources-note a:hover { color: var(--rust); border-color: var(--rust); }

/* ---------- footnote links (dollar-strip methodology reference) ---------- */

.footnote a {
  color: var(--ink-soft);
  border-bottom: 1px solid var(--edge-soft);
  padding-bottom: 1px;
}

.footnote a:hover { color: var(--rust); border-color: var(--rust); }

/* ---------- sources & methodology page ---------- */

.method-list {
  list-style: none;
  margin-top: 22px;
  max-width: 62ch;
}

.method-list li {
  padding: 14px 0;
  border-top: 1px solid var(--edge-soft);
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.6;
}

.method-list li:last-child { border-bottom: 1px solid var(--edge-soft); }

.method-list b {
  display: block;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}

.method-list b .amt { color: var(--rust); }

/* on the sources page the sources-note blocks stack as per-layer groups */
.sources-note + .sources-note { margin-top: 8px; }

/* ---------- chart placeholder (honest empty state inside chart-card) ---------- */

.chart-placeholder {
  min-height: 220px;
  display: grid;
  place-items: center;
  margin-top: 14px;
  padding: 36px 28px;
  border: 1px dashed var(--ink);
  border-radius: var(--radius);
  text-align: center;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  line-height: 2.1;
}

/* ---------- chat banner (DIEM-exhausted state, shown above the form) ---------- */

.chat-banner {
  position: relative;
  margin: 12px 14px 0;
  padding: 12px 34px 12px 14px;
  background: var(--rust-wash);
  border: 1px solid var(--edge-soft);
  border-left: 3px solid var(--rust);
  border-radius: var(--radius);
}

.chat-banner b {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 4px;
}

.chat-banner p {
  font-family: var(--ui);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.chat-banner-dismiss {
  position: absolute;
  top: 6px;
  right: 6px;
  border: none;
  background: none;
  color: var(--ink-faint);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
}

.chat-banner-dismiss:hover { color: var(--rust); }

/* ---------- chat error message (hiccup state, reads as system status) ---------- */

.msg--error {
  align-self: flex-start;
  background: var(--paper-raise);
  border: 1px dashed var(--edge-soft);
  color: var(--ink-faint);
}

/* ---------- chat thread-full row (thread cap reached) ---------- */

.chat-thread-full {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 10px 0 4px;
  text-align: center;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.chat-thread-full button {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease,
    border-color 0.15s ease;
}

.chat-thread-full button:hover {
  background: var(--rust-wash);
  border-color: var(--rust);
  color: var(--rust);
}

/* ---------- streaming caret (blinking block while an answer streams) ---------- */

.msg--ai.is-streaming::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 14px;
  margin-left: 3px;
  vertical-align: text-bottom;
  background: var(--ink);
}

@media (prefers-reduced-motion: no-preference) {
  .msg--ai.is-streaming::after {
    animation: caretBlink 1s steps(1, end) infinite;
  }

  @keyframes caretBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
  }
}

/* ---------- homepage about section (thesis-chapters family) ---------- */

.about {
  border-top: 1px solid var(--edge-soft);
  padding: 88px 0 40px;
}

.about h2 {
  font-family: var(--head);
  font-stretch: condensed;
  font-size: clamp(28px, 4.6vw, 40px);
  font-weight: 800;
  letter-spacing: -0.005em;
  line-height: 1.08;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.about p {
  color: var(--ink-soft);
  font-size: 16.5px;
  line-height: 1.7;
  max-width: 60ch;
}

.about p + p { margin-top: 14px; }

/* Hero blurb — the purpose statement under the wordmark */
.hero .hero-blurb {
  margin-top: 20px;
  max-width: 58ch;
  font-family: var(--font);
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.55;
  color: var(--ink-soft);
}

/* Axis caption — sits beneath the stack diagram */
.axis-caption {
  margin-top: 28px;
  text-align: center;
  font-family: var(--mono);
  font-size: clamp(11px, 1.8vw, 13px);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}