/* Theia School — How the Machines Learned to Talk */

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

:root {
  --bg:           #080808;
  --surface:      #0f0f0f;
  --surface-2:    #131313;
  --border:       #1e1e1e;
  --text:         #f0f0f0;
  --text-2:       #6b7280;

  --accent:       #ff4d45;
  --accent-hover: #ff6660;
  --accent-dim:   rgba(255, 77, 69, 0.12);
  --accent-line:  rgba(255, 77, 69, 0.32);

  --done:         #34d399;
  --done-dim:     rgba(52, 211, 153, 0.12);
  --done-line:    rgba(52, 211, 153, 0.35);

  --ff-body:      'Inter', system-ui, sans-serif;
  --ff-mono:      'JetBrains Mono', monospace;
  --ff-pixel:     'Pixelify Sans', 'Courier New', monospace;
  --ff-dot:       'Silkscreen', 'JetBrains Mono', monospace;
}

html { scroll-behavior: smooth; background: var(--bg); }

::selection { background: rgba(255, 77, 69, 0.35); color: #fff; }

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

body {
  background: transparent;
  color: var(--text);
  font-family: var(--ff-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.page { position: relative; }

a { color: inherit; }

/* ── NAV ─────────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 14px 40px;
  border-bottom: 1px solid var(--border);
  background: rgba(8, 8, 8, 0.78);
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand { display: flex; align-items: center; gap: 9px; text-decoration: none; }
.nav-logo  { height: 20px; width: auto; display: block; opacity: 0.9; }

.wordmark {
  font-family: var(--ff-dot);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--text);
}

.wordmark .wordmark-sub { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 22px; }

.nav-links a {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.12s;
}

.nav-links a:hover { color: var(--text); }

/* nav progress chip */
.nav-progress {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--text-2);
  border: 1px solid var(--border);
  padding: 6px 12px;
}

.nav-progress .bar {
  width: 64px; height: 4px;
  background: var(--border);
  overflow: hidden;
}

.nav-progress .bar span { display: block; height: 100%; background: var(--accent); width: 0; transition: width 0.4s ease; }

/* ── COURSE SIDEBAR ──────────────────────────────────── */

.nav-menu-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-2);
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  padding: 6px 12px;
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s;
}

.nav-menu-btn:hover { color: var(--accent); border-color: var(--accent-line); }

.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: 264px;
  z-index: 150;
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(16px);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 0 0 28px;
  scrollbar-width: thin;
  scrollbar-color: #2a2a2a transparent;
}

.sb-head {
  padding: 17px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 10, 10, 0.95);
  z-index: 1;
}

.sb-brand { display: flex; align-items: center; gap: 9px; text-decoration: none; }
.sb-logo { height: 18px; width: auto; opacity: 0.9; }

.sb-progress { padding: 18px 20px 16px; border-bottom: 1px solid var(--border); }

.sb-progress-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 10px;
}

.sb-progress-label {
  font-family: var(--ff-mono);
  font-size: 0.56rem;
  letter-spacing: 0.18em;
  color: var(--text-2);
}

.sb-progress-count {
  font-family: var(--ff-dot);
  font-size: 0.64rem;
  color: var(--accent);
}

.sb-bar { height: 4px; background: var(--border); overflow: hidden; }
.sb-bar span { display: block; height: 100%; background: var(--accent); transition: width 0.4s ease; }

.sb-nav { padding: 10px 0; }

.sb-part { border-bottom: 1px solid rgba(30, 30, 30, 0.6); }

.sb-part-btn {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 10px;
  background: none;
  border: none;
  padding: 13px 20px;
  cursor: pointer;
  text-align: left;
  transition: background 0.12s;
}

.sb-part-btn:hover { background: rgba(255, 77, 69, 0.04); }

.sb-roman {
  font-family: var(--ff-dot);
  font-size: 0.62rem;
  color: var(--accent);
  min-width: 22px;
  flex-shrink: 0;
}

.sb-part-title {
  font-family: var(--ff-body);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text);
  flex: 1;
  line-height: 1.35;
}

.sb-count {
  font-family: var(--ff-mono);
  font-size: 0.56rem;
  color: var(--text-2);
  flex-shrink: 0;
}

.sb-chapters {
  display: none;
  padding: 2px 0 10px;
}

.sb-part.is-open .sb-chapters { display: block; }
.sb-part.is-open .sb-part-btn { background: rgba(255, 77, 69, 0.03); }

.sb-ch {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 20px 7px 26px;
  text-decoration: none;
  transition: background 0.12s;
}

.sb-ch:hover { background: rgba(255, 255, 255, 0.03); }

.sb-ch-num {
  font-family: var(--ff-mono);
  font-size: 0.56rem;
  color: var(--text-2);
  min-width: 18px;
  flex-shrink: 0;
}

.sb-ch-title {
  font-size: 0.74rem;
  color: var(--text-2);
  flex: 1;
  line-height: 1.4;
}

.sb-ch:hover .sb-ch-title { color: var(--text); }

.sb-ch-dot {
  width: 7px;
  height: 7px;
  border: 1px solid #333;
  flex-shrink: 0;
  align-self: center;
}

.sb-ch.is-done .sb-ch-dot { background: var(--done); border-color: var(--done); }
.sb-ch.is-done .sb-ch-num { color: var(--done); }

.sb-ch.is-current { border-left: 2px solid var(--accent); background: rgba(255, 77, 69, 0.05); }
.sb-ch.is-current .sb-ch-title { color: var(--text); font-weight: 500; }
.sb-ch.is-current .sb-ch-num { color: var(--accent); }

.sb-solo { padding-left: 20px; border-bottom: 1px solid rgba(30, 30, 30, 0.6); padding-top: 12px; padding-bottom: 12px; }

.sb-links { padding: 16px 20px; display: flex; flex-direction: column; gap: 12px; }

.sb-link {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.12s;
}

.sb-link:hover { color: var(--accent); }

.sb-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 140;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

/* desktop: fixed rail, content shifts right */
@media (min-width: 1200px) {
  .has-sidebar .nav { left: 264px; }
  .has-sidebar .nav .nav-brand { display: none; }   /* brand lives in the sidebar */
  .has-sidebar .nav .nav-links { margin-left: auto; }
  .has-sidebar .page,
  .has-sidebar .reader-shell { margin-left: 264px; }
  .nav-menu-btn { display: none; }
}

/* below desktop: drawer */
@media (max-width: 1199.98px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    width: 288px;
  }
  .sidebar.open { transform: translateX(0); }
  .sb-backdrop.open { opacity: 1; pointer-events: all; }
}

/* ── HUB HERO ────────────────────────────────────────── */

.hero {
  position: relative;
  padding: 170px 24px 90px;
  text-align: center;
}

.hero-glow {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 100%; height: 60%;
  background: radial-gradient(ellipse at 50% 0%, rgba(255, 77, 69, 0.07) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; max-width: 780px; margin: 0 auto; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-line);
  padding: 5px 14px;
  margin-bottom: 36px;
}

.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(255, 77, 69, 0.7);
  animation: pulse-red 2s ease-in-out infinite;
}

@keyframes pulse-red { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.headline {
  font-family: var(--ff-dot);
  font-size: clamp(30px, 4.6vw, 54px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.02em;
  margin-bottom: 24px;
}

.sub {
  font-size: 1.05rem;
  color: var(--text-2);
  line-height: 1.82;
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 24px;
  font-family: var(--ff-pixel);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }

.btn-ghost { background: transparent; color: var(--text); border-color: #2a2a2a; }
.btn-ghost:hover { border-color: var(--accent-line); color: var(--accent); }

/* ── TOKEN TICKER (hero) ─────────────────────────────── */

.token-ticker {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  font-family: var(--ff-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--text-2);
  margin-bottom: 28px;
  min-height: 1.6em;
  white-space: nowrap;
  overflow: hidden;
}

.tt-prompt { color: var(--accent); }

.tt-text { color: var(--text-2); }

.tt-candidates { display: inline-flex; gap: 6px; }

.tt-cand {
  color: #3f3f3f;
  border: 1px solid var(--border);
  padding: 0 7px;
  transition: color 0.1s, border-color 0.1s;
}

.tt-cand .tt-p { color: #333; margin-left: 5px; font-size: 0.85em; }

.tt-cand.hot {
  color: var(--accent);
  border-color: var(--accent-line);
}

.tt-cand.hot .tt-p { color: rgba(255, 77, 69, 0.6); }

.tt-cand.locked {
  color: var(--text);
  border-color: transparent;
  padding: 0;
}

.tt-cand.locked .tt-p { display: none; }

/* ── SYSTEM READOUT (hero) ───────────────────────────── */

.readout {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: 52px;
  font-family: var(--ff-mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  color: var(--text-2);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  padding: 12px 18px;
  background: rgba(15, 15, 15, 0.6);
}

.readout-dot {
  width: 3px;
  height: 3px;
  background: #333;
}

.readout-cursor {
  width: 6px;
  height: 12px;
  background: var(--accent);
  animation: blink-cursor 1s steps(1) infinite;
}

/* ── SECTIONS ────────────────────────────────────────── */

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 90px 48px;
  border-bottom: 1px solid var(--border);
}

.section-label {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 48px;
}

.section-label .mono {
  color: var(--accent);
  margin-right: 10px;
  font-family: var(--ff-pixel);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
}

/* ── CHAPTER MAP (dot-matrix progress) ───────────────── */

.map-wrap {
  border: 1px solid var(--border);
  background: rgba(15, 15, 15, 0.72);
  backdrop-filter: blur(8px);
  padding: 30px 32px 26px;
}

.chapter-map {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  row-gap: 18px;
  margin-bottom: 24px;
}

.map-group { display: flex; flex-direction: column; gap: 8px; }

.map-cells { display: flex; gap: 6px; }

.map-part-label {
  font-family: var(--ff-dot);
  font-size: 0.56rem;
  color: var(--text-2);
  letter-spacing: 0.1em;
  text-align: center;
}

.map-cell {
  width: 18px;
  height: 18px;
  border: 1px solid #2e2e2e;
  background: transparent;
  display: block;
  text-decoration: none;
  transition: border-color 0.12s, background 0.12s, transform 0.12s;
}

.map-cell:hover {
  border-color: var(--accent-line);
  transform: scale(1.18);
}

.map-cell.is-done {
  background: var(--accent);
  border-color: var(--accent);
}

.map-cell.is-done:hover { background: var(--accent-hover); }

.map-cell.is-next {
  border-color: var(--accent);
  animation: cell-pulse 1.8s ease-in-out infinite;
}

@keyframes cell-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 77, 69, 0.45); }
  50%       { box-shadow: 0 0 0 5px rgba(255, 77, 69, 0); }
}

.map-readout {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
}

.map-count {
  font-family: var(--ff-dot);
  font-size: 0.95rem;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.map-note {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
}

/* ── AUTHOR ──────────────────────────────────────────── */

.author-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 52px;
  align-items: start;
}

.author-photo-wrap { position: relative; }

.author-photo {
  width: 100%;
  display: block;
  border: 1px solid var(--border);
  filter: grayscale(24%);
}

.author-photo-wrap::after {
  content: '';
  position: absolute;
  top: 10px; left: 10px;
  width: 100%; height: 100%;
  border: 1px solid var(--accent-line);
  z-index: -1;
}

.author-photo-tag {
  position: absolute;
  bottom: 10px;
  left: -1px;
  font-family: var(--ff-mono);
  font-size: 0.56rem;
  letter-spacing: 0.2em;
  color: #fff;
  background: var(--accent);
  padding: 4px 10px;
}

/* colophon — key/value ledger */
.colophon { border-top: 1px solid var(--border); }

.colophon-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.colophon-key {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  padding-top: 3px;
}

.colophon-val {
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.8;
}

.colophon-row:first-child .colophon-val { color: var(--text); font-weight: 500; }

.colophon-links { display: flex; gap: 20px; flex-wrap: wrap; }

.colophon-links a {
  font-family: var(--ff-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding-bottom: 3px;
  transition: color 0.12s, border-color 0.12s;
}

.colophon-links a:hover { color: var(--accent); border-color: var(--accent-line); }

/* ── CURRICULUM ──────────────────────────────────────── */

.part-block { margin-bottom: 72px; position: relative; }
.part-block:last-child { margin-bottom: 0; }

/* oversized ghost numeral behind each part header */
.part-block::before {
  content: attr(data-ghost);
  position: absolute;
  top: -60px;
  right: -8px;
  font-family: var(--ff-pixel);
  font-size: clamp(120px, 15vw, 210px);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.07);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.part-block > * { position: relative; z-index: 1; }

.part-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.part-num {
  font-family: var(--ff-dot);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.part-title {
  font-family: var(--ff-pixel);
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.part-level {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-2);
  border: 1px solid var(--border);
  padding: 4px 10px;
}

.part-desc { color: var(--text-2); font-size: 0.92rem; max-width: 640px; margin-bottom: 24px; line-height: 1.75; }

/* ── TABLE OF CONTENTS rows ──────────────────────────── */

.toc { border-top: 1px solid var(--border); }

.toc-row {
  display: block;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding: 16px 8px 15px;
  transition: background 0.12s, border-color 0.12s;
  position: relative;
}

/* red spine sweep on hover — echoes the accent line elsewhere */
.toc-row::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform 0.15s ease;
}

.toc-row:hover { background: rgba(255, 77, 69, 0.03); }
.toc-row:hover::before { transform: scaleY(1); }

.toc-line {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.toc-num {
  font-family: var(--ff-dot);
  font-size: 0.7rem;
  color: var(--text-2);
  letter-spacing: 0.08em;
  min-width: 34px;
  flex-shrink: 0;
}

.toc-row:hover .toc-num { color: var(--accent); }

.toc-title {
  font-family: var(--ff-body);
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-leader {
  flex: 1;
  min-width: 24px;
  border-bottom: 1px dotted #2e2e2e;
  transform: translateY(-4px);
}

.toc-time {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-2);
  flex-shrink: 0;
}

/* CSS-drawn status square — renders identically everywhere */
.toc-status {
  width: 10px;
  height: 10px;
  border: 1px solid #3f3f3f;
  flex-shrink: 0;
  align-self: center;
}

.toc-row.is-done .toc-status { background: var(--done); border-color: var(--done); }
.toc-row.is-done .toc-num    { color: var(--done); }

.toc-blurb {
  margin: 6px 0 0 48px;
  font-size: 0.8rem;
  color: var(--text-2);
  line-height: 1.6;
  max-width: 640px;
}

.section-intro { color: var(--text-2); font-size: 0.94rem; max-width: 640px; margin: -28px 0 36px; line-height: 1.8; }

/* ── FOOTER ──────────────────────────────────────────── */

.footer {
  padding: 28px 48px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  background: rgba(8, 8, 8, 0.75);
  backdrop-filter: blur(8px);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  color: var(--text);
}

.footer-logo { height: 14px; width: auto; opacity: 0.7; }
.footer-copy { font-family: var(--ff-mono); font-size: 0.62rem; color: var(--text-2); }
.footer-links { margin-left: auto; display: flex; gap: 24px; }

.footer-links a {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.12s;
}

.footer-links a:hover { color: var(--text); }

/* ── READER ──────────────────────────────────────────── */

.readbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 110;
  background: transparent;
}

.readbar span { display: block; height: 100%; width: 0; background: var(--accent); }

.reader {
  max-width: 760px;
  margin: 0 auto;
  padding: 150px 28px 60px;
}

.reader-crumbs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 34px;
}

.reader-part {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.reader-time {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
}

.reader-loading {
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-2);
  padding: 80px 0;
  text-align: center;
}

.reader-error { color: var(--accent); }

/* markdown content */
.md { font-size: 1.02rem; line-height: 1.85; color: #d6d6d6; }

.reader-fallback {
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--text-2);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  background: rgba(255, 77, 69, 0.05);
  padding: 10px 14px;
  margin-bottom: 28px;
}

.md h1 {
  font-family: var(--ff-pixel);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 600;
  line-height: 1.22;
  color: var(--text);
  letter-spacing: 0.01em;
  margin: 0 0 28px;
}

.md h2 {
  font-family: var(--ff-pixel);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  margin: 56px 0 18px;
  letter-spacing: 0.01em;
}

/* recurring book sections carry their own mark */
.md h2.h-short::before,
.md h2.h-honest::before {
  display: block;
  font-family: var(--ff-mono);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  margin-bottom: 8px;
}

.md h2.h-short::before {
  content: 'TL;DR';
  color: var(--accent);
}

.md h2.h-honest {
  color: #fbbf24;
}

.md h2.h-honest::before {
  content: 'NO SPIN';
  color: #fbbf24;
}

.md h3 {
  font-family: var(--ff-body);
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--text);
  margin: 40px 0 14px;
}

.md h4 { font-size: 1rem; font-weight: 600; color: var(--text); margin: 30px 0 10px; }

.md p { margin: 0 0 18px; }

.md a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-line); }
.md a:hover { color: var(--accent-hover); }

.md strong { color: var(--text); font-weight: 600; }

.md ul, .md ol { margin: 0 0 18px; padding-left: 26px; }
.md li { margin-bottom: 8px; }
.md li::marker { color: var(--accent); }

.md blockquote {
  border-left: 2px solid var(--accent);
  background: rgba(255, 77, 69, 0.05);
  padding: 14px 20px;
  margin: 0 0 20px;
  color: var(--text-2);
}

.md blockquote p:last-child { margin-bottom: 0; }

.md code {
  font-family: var(--ff-mono);
  font-size: 0.86em;
  background: #161616;
  border: 1px solid var(--border);
  padding: 1px 6px;
  color: #e8e8e8;
  word-break: break-word;
}

.md pre {
  background: #0d0d0d;
  border: 1px solid var(--border);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 22px;
  line-height: 1.6;
}

.md pre code { background: none; border: none; padding: 0; font-size: 0.82rem; color: #d8d8d8; }

.md hr { border: none; border-top: 1px solid var(--border); margin: 44px 0; }

.md table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 24px;
  font-size: 0.88rem;
  display: block;
  overflow-x: auto;
}

.md th, .md td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}

.md th {
  font-family: var(--ff-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
  background: #101010;
}

.md img { max-width: 100%; }

/* ── SECTION TOC ("in this chapter") ─────────────────── */

/* fixed right rail on wide screens */
.section-toc {
  position: fixed;
  top: 130px;
  right: 28px;
  width: 216px;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
  display: none;
  scrollbar-width: thin;
  scrollbar-color: #2a2a2a transparent;
}

.section-toc-label {
  font-family: var(--ff-mono);
  font-size: 0.56rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 14px;
}

.section-toc a {
  display: block;
  font-size: 0.76rem;
  color: var(--text-2);
  text-decoration: none;
  line-height: 1.45;
  padding: 6px 0 6px 14px;
  border-left: 1px solid var(--border);
  transition: color 0.12s, border-color 0.12s;
}

.section-toc a:hover { color: var(--text); }

.section-toc a.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
}

/* collapsible fallback above the article on narrower screens */
.section-toc-inline {
  border: 1px solid var(--border);
  background: rgba(15, 15, 15, 0.72);
  margin-bottom: 34px;
}

.section-toc-inline summary {
  font-family: var(--ff-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-2);
  padding: 12px 18px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-toc-inline summary::before {
  content: '';
  width: 6px;
  height: 6px;
  border-right: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  transform: rotate(-45deg);
  transition: transform 0.15s;
}

.section-toc-inline[open] summary::before { transform: rotate(45deg); }

.section-toc-inline nav { padding: 4px 18px 14px; }

.section-toc-inline a {
  display: block;
  font-size: 0.8rem;
  color: var(--text-2);
  text-decoration: none;
  padding: 5px 0;
  transition: color 0.12s;
}

.section-toc-inline a:hover { color: var(--accent); }

@media (min-width: 1500px) {
  .section-toc { display: block; }
  .section-toc-inline { display: none; }
}

/* ── CODE COPY BUTTON ────────────────────────────────── */

.md pre { position: relative; }

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(8, 8, 8, 0.85);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-family: var(--ff-mono);
  font-size: 0.56rem;
  letter-spacing: 0.14em;
  padding: 5px 10px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.12s, color 0.12s, border-color 0.12s;
}

.md pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }

.copy-btn:hover { color: var(--accent); border-color: var(--accent-line); }

.copy-btn.copied { color: var(--done); border-color: var(--done-line); opacity: 1; }

/* ── COMPLETION TOAST ────────────────────────────────── */

.complete-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translate(-50%, 80px);
  z-index: 190;
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(13, 13, 13, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--accent-line);
  padding: 12px 16px;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.complete-toast.show {
  transform: translate(-50%, 0);
  opacity: 1;
  pointer-events: all;
}

.complete-toast-text {
  font-family: var(--ff-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-2);
}

.complete-toast-btn {
  background: var(--accent);
  border: none;
  color: #fff;
  font-family: var(--ff-pixel);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 8px 14px;
  cursor: pointer;
  transition: background 0.12s;
}

.complete-toast-btn:hover { background: var(--accent-hover); }

.complete-toast-dismiss {
  background: none;
  border: none;
  color: var(--text-2);
  font-family: var(--ff-mono);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 4px;
}

.complete-toast-dismiss:hover { color: var(--text); }

/* reader footer controls */
.reader-actions {
  margin-top: 60px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.complete-btn {
  background: transparent;
  border: 1px solid #2a2a2a;
  color: var(--text);
  padding: 13px 22px;
  font-family: var(--ff-pixel);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s, background 0.12s;
}

.complete-btn:hover { border-color: var(--accent-line); color: var(--accent); }

.complete-btn.is-done {
  border-color: var(--done-line);
  color: var(--done);
  background: var(--done-dim);
}

.pager { display: flex; gap: 10px; }

.pager a, .pager span.disabled {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 12px 18px;
  min-width: 150px;
  transition: border-color 0.12s;
}

.pager a:hover { border-color: var(--accent-line); }
.pager span.disabled { opacity: 0.35; }

.pager .dir {
  font-family: var(--ff-mono);
  font-size: 0.56rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
}

.pager .name { font-size: 0.82rem; color: var(--text); font-weight: 500; }

.pager .next { text-align: right; }

/* ── ARIA CHAT WIDGET ────────────────────────────────── */

.chat-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
}

.chat-fab {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  transition: background 0.12s, transform 0.15s;
}

.chat-fab svg { width: 18px; height: 18px; display: block; }

.chat-fab:hover { background: var(--accent-hover); transform: scale(1.08); }

.chat-fab--pulse { animation: fab-pulse 2.2s ease-in-out infinite; }

@keyframes fab-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 77, 69, 0.4); }
  50%       { box-shadow: 0 0 0 10px rgba(255, 77, 69, 0); }
}

.chat-panel {
  position: absolute;
  bottom: 62px;
  right: 0;
  width: 356px;
  max-height: 500px;
  background: #0d0d0d;
  border: 1px solid #222;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.93) translateY(14px);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
  transform-origin: bottom right;
}

.chat-panel.open {
  transform: scale(1) translateY(0);
  opacity: 1;
  pointer-events: all;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid #1e1e1e;
  flex-shrink: 0;
}

.chat-header-info { display: flex; align-items: center; gap: 8px; }

.chat-header-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal, #06b6d4);
  box-shadow: 0 0 6px rgba(6, 182, 212, 0.7);
}

.chat-header-title {
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text);
}

.chat-header-close {
  background: none;
  border: none;
  color: var(--text-2);
  font-size: 18px;
  cursor: pointer;
  padding: 2px;
  display: flex;
  transition: color 0.12s;
}

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

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-msg {
  max-width: 88%;
  padding: 9px 12px;
  font-family: var(--ff-body);
  font-size: 13px;
  line-height: 1.55;
  word-break: break-word;
}

.chat-msg--bot {
  background: #141414;
  color: var(--text-2);
  border: 1px solid #1e1e1e;
  align-self: flex-start;
}

.chat-msg--user {
  background: var(--accent-dim);
  color: var(--text);
  border: 1px solid var(--accent-line);
  align-self: flex-end;
}

.chat-msg--typing {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 12px 14px;
}

.chat-msg--typing span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-2);
  animation: chatDot 1.2s ease-in-out infinite;
}

.chat-msg--typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-msg--typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes chatDot {
  0%, 60%, 100% { transform: translateY(0);   opacity: 0.3; }
  30%           { transform: translateY(-5px); opacity: 1;  }
}

.chat-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid #1e1e1e;
  flex-shrink: 0;
}

.chat-input {
  flex: 1;
  background: #111;
  border: 1px solid #222;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text);
  font-family: var(--ff-body);
  outline: none;
  transition: border-color 0.12s;
  min-width: 0;
}

.chat-input:focus { border-color: var(--accent-line); }
.chat-input::placeholder { color: #4b5563; }

.chat-send {
  width: 34px;
  height: 34px;
  background: var(--accent);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  cursor: pointer;
  transition: background 0.12s;
}

.chat-send svg { width: 15px; height: 15px; display: block; }

.chat-send:hover { background: var(--accent-hover); }
.chat-send:disabled { opacity: 0.35; cursor: default; }

.chat-msg--streaming::after {
  content: '▋';
  display: inline-block;
  margin-left: 2px;
  animation: blink-cursor 0.7s steps(1) infinite;
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

@media (max-width: 700px) {
  .chat-panel { width: calc(100vw - 32px); }
}

/* ── RESPONSIVE ──────────────────────────────────────── */

@media (max-width: 900px) {
  .author-grid { grid-template-columns: 1fr; gap: 36px; }
  .author-photo-wrap { max-width: 220px; }
  .colophon-row { grid-template-columns: 1fr; gap: 6px; }
}

@media (max-width: 700px) {
  .nav { padding: 14px 20px; }
  .nav-links { gap: 14px; }
  .nav-progress { display: none; }
  .section { padding: 64px 20px; }
  .hero { padding: 140px 20px 64px; }
  .token-ticker { font-size: 0.66rem; }
  .readout { gap: 10px; padding: 10px 14px; font-size: 0.56rem; flex-wrap: wrap; justify-content: center; }
  .toc-blurb { margin-left: 0; }
  .toc-time { display: none; }
  .reader { padding: 130px 18px 48px; }
  .reader-actions { flex-direction: column; align-items: stretch; }
  .pager { flex-direction: column; }
  .pager a, .pager span.disabled { min-width: 0; }
  .footer { padding: 24px 20px; gap: 14px; }
  .footer-links { margin-left: 0; }
}