/* ============================================================================
   CODEX COURSE — THEME.CSS
   Single authoritative design-system layer. Loaded last. Wins the cascade.

   Scope: colors, typography, core chrome (topbar, buttons, links).
   Philosophy: commit to one light theme everywhere. WCAG AAA for body text.
   Keeps terminal character via mono for code + UI chrome only.
   ============================================================================ */

/* ---- 1. WEB FONTS --------------------------------------------------------- */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap");

/* ---- 2. DESIGN TOKENS — the single source of truth ------------------------ */

:root {
  /* ── Backgrounds ── */
  --bg-page:       #FAF9F6;   /* warm off-white — primary canvas */
  --bg-elevated:   #FFFFFF;   /* cards, modals, lifted surfaces */
  --bg-sunken:     #F1EFE9;   /* input fields, subtle wells */
  --bg-code:       #0B0D10;   /* terminal/code blocks — intentional dark */
  --bg-topbar:     rgba(250, 249, 246, 0.85);  /* translucent light topbar */

  /* ── Text (contrast vs --bg-page #FAF9F6) ── */
  --fg-primary:    #0B0D10;   /* 17.5:1 — AAA — body, lesson titles, hero */
  --fg-secondary:  #3B3F47;   /* 10.2:1 — AAA — descriptions, sub-headings */
  --fg-tertiary:   #6B7280;   /* 5.2:1  — AA+ — captions, metadata */
  --fg-muted:      #5F6670;   /* 5.46:1 — UI chrome, separators, TOC nums (WCAG AA) */
  --fg-inverted:   #FAF9F6;   /* for use on dark surfaces (code blocks) */
  --fg-code:       #E8ECF2;   /* body text on --bg-code */
  --fg-code-muted: #9AA3B2;   /* comments on --bg-code */

  /* ── Accent (cyan, inherited brand) ── */
  --accent:        #0E6AF0;   /* 4.6:1 vs --bg-page — links, primary action */
  --accent-hover:  #0956C9;
  --accent-active: #073F93;
  --accent-tint:   rgba(14, 106, 240, 0.08);  /* subtle highlight wash */

  /* ── Borders / rules ── */
  --rule:          #E5E2D9;   /* default hairline */
  --rule-strong:   #D6D2C6;   /* emphatic borders, input outlines */
  --rule-subtle:   #EEEAE0;   /* barely-there separators */

  /* ── Semantics ── */
  --success:       #0F8A3F;
  --success-tint:  rgba(15, 138, 63, 0.1);
  --warning:       #B45309;
  --warning-tint:  rgba(180, 83, 9, 0.1);
  --danger:        #B3261E;
  --danger-tint:   rgba(179, 38, 30, 0.1);

  /* ── Shadows (soft, editorial) ── */
  --shadow-sm:     0 1px 0 rgba(11, 13, 16, 0.04);
  --shadow-md:     0 1px 2px rgba(11, 13, 16, 0.06), 0 2px 8px rgba(11, 13, 16, 0.04);
  --shadow-lg:     0 4px 16px rgba(11, 13, 16, 0.08), 0 16px 48px rgba(11, 13, 16, 0.06);
  --shadow-topbar: 0 1px 0 var(--rule-subtle);

  /* ── Type stacks ── */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* ── Type scale ── */
  --fs-xs:    12px;
  --fs-sm:    14px;
  --fs-base:  16px;
  --fs-md:    18px;
  --fs-lg:    20px;
  --fs-xl:    24px;
  --fs-2xl:   32px;
  --fs-3xl:   40px;
  --fs-4xl:   56px;
  --fs-hero:  72px;

  /* ── Radii ── */
  --radius-xs:  3px;
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --radius-xl:  20px;

  /* ── Layout ── */
  --container:  1100px;
}

/* Override legacy tokens so older CSS uses the new values without edits */
:root {
  --ink:    var(--fg-primary);
  --ink-2:  var(--fg-secondary);
  --ink-3:  var(--fg-tertiary);
  --paper:  var(--bg-page);
  --paper-2: var(--bg-elevated);
  --accent-1: var(--accent);
  --cx-rule: var(--rule);
  --rule-1: var(--rule);
  --cx-cyan: var(--accent);
}

/* ---- 3. RESET & BASE TYPOGRAPHY ------------------------------------------ */

html, body {
  background: var(--bg-page);
  color: var(--fg-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  min-height: 100vh;
}

/* Headings: tight, editorial */
h1, h2, h3, h4, h5, h6,
.hero h1, .hero-title {
  font-family: var(--font-sans);
  color: var(--fg-primary);
  line-height: 1.12;
  letter-spacing: -0.022em;
  font-weight: 700;
  margin: 0 0 0.5em;
}

h1, .hero h1 {
  font-size: clamp(40px, 6vw, var(--fs-hero));
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1.04;
}

h2 {
  font-size: clamp(28px, 3.5vw, var(--fs-3xl));
  letter-spacing: -0.024em;
}

h3 {
  font-size: var(--fs-xl);
  font-weight: 650;
  letter-spacing: -0.018em;
}

h4 {
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: -0.012em;
}

/* Body paragraphs */
p {
  color: var(--fg-secondary);
  line-height: 1.7;
  font-size: var(--fs-md);
  max-width: 68ch;
}

.lead, .hero p, p.lead {
  color: var(--fg-secondary);
  font-size: var(--fs-lg);
  line-height: 1.55;
  max-width: 62ch;
  font-weight: 400;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 120ms ease;
}
a:hover { color: var(--accent-hover); }

strong, b { color: var(--fg-primary); font-weight: 650; }
em { color: inherit; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

/* Code stays mono */
code, pre, kbd, samp,
.mono, .code, .terminal, .terminal *,
.block-mono, .snippet, [data-code] {
  font-family: var(--font-mono) !important;
  font-feature-settings: "zero", "ss01";
}

code {
  font-size: 0.9em;
  background: var(--bg-sunken);
  color: var(--fg-primary);
  padding: 0.12em 0.35em;
  border-radius: var(--radius-xs);
}

pre, .block-mono, .code-block {
  background: var(--bg-code);
  color: var(--fg-code);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  line-height: 1.55;
  overflow-x: auto;
  font-size: var(--fs-sm);
}

::selection { background: var(--accent); color: #fff; }

/* ---- 4. TOPBAR ----------------------------------------------------------- */

.topbar {
  background: var(--bg-topbar) !important;
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--rule-subtle) !important;
  box-shadow: var(--shadow-sm);
  color: var(--fg-primary) !important;
}

.topbar-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* Brand */
.topbar .brand {
  color: var(--fg-primary) !important;
  font-family: var(--font-mono) !important;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.topbar .brand-mark,
.topbar .brand-icon,
.topbar .brand svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
}

.topbar .brand-word-1 {
  font-family: var(--font-mono) !important;
  font-size: 14px !important;
  color: var(--fg-primary) !important;
  font-weight: 600 !important;
  letter-spacing: -0.01em !important;
}
.topbar .brand-tagline,
.topbar .brand-word-2 {
  color: var(--fg-tertiary) !important;
  font-family: var(--font-mono) !important;
  font-size: 12px !important;
  font-weight: 400 !important;
  letter-spacing: 0 !important;
}
.topbar .brand-divider {
  color: var(--fg-muted) !important;
  margin: 0 6px !important;
}

/* Crumb (lesson pages) */
.topbar .topbar-crumb,
.topbar .crumb {
  color: var(--fg-tertiary) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  letter-spacing: 0.02em;
}
.topbar .topbar-crumb strong,
.topbar .crumb strong {
  color: var(--fg-primary) !important;
  font-weight: 600;
}

/* Nav cluster right */
.topbar-nav,
.topbar .topbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar a,
.topbar button,
.topbar .btn-ghost,
.topbar .outline-btn,
.topbar .topbar-link {
  color: var(--fg-primary) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-sm) !important;
  font-weight: 500 !important;
  letter-spacing: -0.005em !important;
  background: transparent !important;
  border: 1px solid transparent !important;
  padding: 7px 12px !important;
  border-radius: var(--radius-sm) !important;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease !important;
  text-decoration: none !important;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.topbar a:hover,
.topbar button:hover,
.topbar .btn-ghost:hover,
.topbar .outline-btn:hover,
.topbar .topbar-link:hover {
  background: rgba(11, 13, 16, 0.06) !important;
  color: var(--fg-primary) !important;
}

.topbar .outline-btn,
.topbar [data-outline-open] {
  border-color: var(--rule-strong) !important;
  background: var(--bg-elevated) !important;
}

/* Back to catalogue — native pill on the light topbar. */
.topbar .topbar-back {
  flex-shrink: 0;
  color: var(--fg-secondary) !important;
  background: var(--bg-elevated) !important;
  border: 1px solid var(--rule-strong) !important;
  border-radius: 999px !important;
  padding: 6px 12px 6px 10px !important;
  gap: 6px;
}
.topbar .topbar-back .tb-arrow {
  font-size: 1.05em;
  line-height: 1;
  transition: transform 200ms cubic-bezier(.2,.7,.2,1);
}
.topbar .topbar-back:hover {
  color: var(--fg-primary) !important;
  background: rgba(11, 13, 16, 0.06) !important;
  border-color: var(--fg-muted) !important;
}
.topbar .topbar-back:hover .tb-arrow { transform: translateX(-2px); }
.topbar .topbar-back:focus-visible {
  outline: 2px solid var(--accent) !important;
  outline-offset: 2px;
}
@media (max-width: 560px) {
  .topbar .topbar-back .tb-back-label { display: none; }
  .topbar .topbar-back { padding: 6px 10px !important; }
}

/* Progress badge */
.topbar .progress-pill,
.topbar .xp-pill,
.topbar .completed-badge,
.topbar [data-completed-badge] {
  color: var(--fg-secondary) !important;
  background: var(--bg-elevated) !important;
  border: 1px solid var(--rule) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  font-weight: 500 !important;
  padding: 6px 10px !important;
  border-radius: var(--radius-sm) !important;
  letter-spacing: 0 !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px;
}
.topbar .progress-pill::before,
.topbar .completed-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

/* Ensure topbar backdrop is not the old dark rgba */
.topbar,
.topbar.shrunk {
  background: var(--bg-topbar) !important;
}

/* ---- 5. HERO ------------------------------------------------------------- */

.hero,
.home-hero,
.page-hero {
  background: transparent !important;
  color: var(--fg-primary);
  padding: 72px 24px 48px;
  max-width: var(--container);
  margin: 0 auto;
}

.hero .eyebrow,
.home-hero .eyebrow,
.page-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--fg-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
  font-weight: 500;
}

.hero h1,
.home-hero h1 {
  color: var(--fg-primary) !important;
  font-family: var(--font-sans) !important;
  max-width: 16ch;
  margin-bottom: 24px;
}

/* The "repo." accent word */
.hero h1 em,
.hero h1 .hi,
.hero h1 .accent,
.hero h1 u {
  font-style: normal;
  color: var(--accent);
  text-decoration: none;
  background: linear-gradient(180deg, transparent 62%, var(--accent-tint) 62%);
  padding: 0 0.05em;
}

.hero p,
.home-hero p {
  color: var(--fg-secondary) !important;
  font-size: var(--fs-lg);
  max-width: 58ch;
  line-height: 1.55;
  margin: 0 0 32px;
}

/* Hero stats row — fix the invisible numerals */
.hero-stats,
.home-hero .stats,
.hero .stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 32px;
  padding: 18px 0 0;
  margin-top: 8px;
  border-top: 1px solid var(--rule-subtle);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--fg-tertiary);
  align-items: baseline;
}

.hero-stats .n,
.home-hero .stats .n,
.hero .stats strong,
.hero-stats strong,
.hero strong {
  color: var(--fg-primary) !important;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ---- 6. BUTTONS --------------------------------------------------------- */

.btn, .button, button.cta,
.btn-primary, .btn-secondary,
a.btn, a.button {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: -0.005em;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, transform 80ms ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  line-height: 1.2;
}

.btn-primary,
a.cta-primary,
.cta.primary {
  background: var(--accent);
  color: #fff !important;
  border-color: var(--accent);
}
.btn-primary:hover,
a.cta-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff !important;
}
.btn-primary:active { background: var(--accent-active); transform: translateY(1px); }

.btn-secondary,
a.cta-secondary,
.cta.secondary,
.browse-btn {
  background: var(--bg-elevated);
  color: var(--fg-primary) !important;
  border-color: var(--rule-strong);
}
.btn-secondary:hover {
  background: var(--bg-page);
  border-color: var(--fg-primary);
}

/* ---- 7. COURSE OUTLINE (homepage) --------------------------------------- */

.course-outline,
#course-outline,
section[data-outline] {
  padding: 48px 24px 96px;
  max-width: var(--container);
  margin: 0 auto;
}

.course-outline h2,
.course-outline-title {
  color: var(--fg-primary) !important;
  font-size: var(--fs-2xl);
  letter-spacing: -0.024em;
  margin-bottom: 8px;
}

.course-outline .section-subtitle,
.course-outline > p {
  color: var(--fg-secondary) !important;
  font-size: var(--fs-md);
  max-width: 68ch;
  margin-bottom: 48px;
}

.track-block,
.track-row,
.track {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  padding: 32px 0;
  border-top: 1px solid var(--rule);
}
.track-block:first-of-type,
.track:first-of-type { border-top: 1px solid var(--rule-strong); }

.track-meta,
.track-header,
.track-header-col {
  padding-right: 16px;
}

.track-tag,
.track-eyebrow {
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  color: var(--fg-tertiary) !important;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 500;
  display: block;
}

.track-title,
.track h3,
.track-meta h3,
.track-name {
  color: var(--fg-primary) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-xl) !important;
  font-weight: 650 !important;
  letter-spacing: -0.018em;
  line-height: 1.18;
  margin: 0 0 8px !important;
}

.track-desc,
.track-meta p,
.track > p {
  color: var(--fg-secondary) !important;
  font-size: var(--fs-sm) !important;
  margin: 0 0 14px !important;
  line-height: 1.55;
  max-width: 30ch;
}

.track-progress,
.track-count {
  color: var(--fg-tertiary) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  letter-spacing: 0;
}

/* Lesson rows inside a track */
.lesson-rows,
.track-lessons {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  overflow: hidden;
}

.lesson-row,
.track-lessons a,
.lesson-rows a {
  display: grid !important;
  grid-template-columns: 56px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 18px 20px !important;
  border-bottom: 1px solid var(--rule-subtle) !important;
  color: var(--fg-primary) !important;
  text-decoration: none !important;
  transition: background 120ms ease;
  background: transparent;
}
.lesson-row:last-child,
.track-lessons a:last-child { border-bottom: 0 !important; }
.lesson-row:hover,
.track-lessons a:hover { background: var(--accent-tint) !important; }

.lesson-num,
.lesson-number {
  font-family: var(--font-mono) !important;
  font-size: var(--fs-sm) !important;
  color: var(--fg-tertiary) !important;
  font-weight: 500 !important;
  letter-spacing: 0;
}

.lesson-body {
  min-width: 0;
}

.lesson-title,
.lesson-row .title,
.lesson-row strong {
  color: var(--fg-primary) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-md) !important;
  font-weight: 600 !important;
  letter-spacing: -0.012em;
  line-height: 1.3;
  display: block;
  margin: 0 0 4px;
}

.lesson-sub,
.lesson-desc,
.lesson-row .sub,
.lesson-row p {
  color: var(--fg-secondary) !important;
  font-size: var(--fs-sm) !important;
  line-height: 1.55;
  margin: 0 !important;
  max-width: 62ch;
}

.lesson-time,
.lesson-row .time,
.lesson-meta {
  color: var(--fg-tertiary) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  white-space: nowrap;
  font-weight: 500;
}

/* ---- 8. LESSON PAGE — TOC + hero --------------------------------------- */

.lesson-hero {
  padding: 48px 24px 24px;
  max-width: var(--container);
  margin: 0 auto;
}

.lesson-hero .eyebrow,
.lesson-eyebrow {
  font-family: var(--font-mono) !important;
  color: var(--fg-tertiary) !important;
  font-size: var(--fs-xs) !important;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.lesson-hero .eyebrow .sep {
  color: var(--fg-muted) !important;
  margin: 0 8px;
}
.lesson-hero h1,
.lesson-title-h1 {
  color: var(--fg-primary) !important;
  font-family: var(--font-sans) !important;
  font-size: clamp(32px, 4.5vw, var(--fs-3xl)) !important;
  font-weight: 700 !important;
  letter-spacing: -0.024em !important;
  line-height: 1.1 !important;
  margin-bottom: 16px !important;
  max-width: 22ch;
}
.lesson-hero .lesson-sub,
.lesson-hero p.lead {
  color: var(--fg-secondary) !important;
  font-size: var(--fs-lg);
  max-width: 58ch;
}

.lesson-meta-row,
.lesson-meta {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
  color: var(--fg-tertiary) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  letter-spacing: 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--rule-subtle);
  margin-top: 24px;
}

/* TOC sidebar */
aside.toc,
.toc-sidebar,
#toc {
  background: transparent;
  padding: 24px 16px 24px 0;
  border-right: 1px solid var(--rule-subtle);
}
.toc-heading,
.toc-title,
aside.toc h4 {
  color: var(--fg-tertiary) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 12px;
}
.toc a,
aside.toc a,
.toc-link {
  color: var(--fg-secondary) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-sm) !important;
  padding: 7px 0 !important;
  line-height: 1.4;
  display: flex;
  gap: 10px;
  text-decoration: none;
  border-radius: 0;
  transition: color 120ms ease;
}
.toc a:hover,
aside.toc a:hover { color: var(--fg-primary) !important; }
.toc a.active,
.toc a[aria-current],
.toc-link.active,
aside.toc a.active {
  color: var(--fg-primary) !important;
  font-weight: 600 !important;
}
.toc a .num,
.toc a .toc-num {
  color: var(--fg-muted) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  font-weight: 500 !important;
  flex-shrink: 0;
}
.toc a.active .num { color: var(--accent) !important; }

/* Reading progress bar */
.reading-progress,
#reading-progress,
.scroll-progress {
  height: 2px !important;
  background: var(--accent) !important;
  box-shadow: none !important;
}

/* ---- 9. CODE/LOOP DIAGRAM ---------------------------------------------- */

.codex-loop,
.loop-window,
.loop-diagram,
.loop-frame {
  background: var(--bg-code) !important;
  color: var(--fg-code) !important;
  border: 1px solid var(--rule-strong) !important;
  border-radius: var(--radius-md) !important;
  overflow: hidden;
  margin: 32px 0;
}
.loop-window-bar,
.loop-titlebar {
  background: #151922;
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--fg-code-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.loop-cols,
.codex-loop > .cols,
.loop-body {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}
.loop-col,
.loop-card {
  padding: 22px 22px 24px;
  border-right: 1px solid rgba(255,255,255,0.06);
}
.loop-col:last-child,
.loop-card:last-child { border-right: 0; }

.loop-col .eyebrow,
.loop-card .eyebrow,
.loop-card-eyebrow {
  color: var(--fg-code-muted) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: flex;
  justify-content: space-between;
  margin-bottom: 14px;
}

.loop-col h3,
.loop-col h4,
.loop-card h3,
.loop-card h4 {
  color: var(--fg-code) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-md) !important;
  font-weight: 600 !important;
  margin: 0 0 10px !important;
  letter-spacing: -0.012em;
}

.loop-col p,
.loop-card p {
  color: var(--fg-code-muted) !important;
  font-size: var(--fs-sm) !important;
  line-height: 1.55;
  max-width: 42ch;
}

.loop-col pre,
.loop-col .mono,
.loop-col .code,
.loop-card pre,
.loop-card .mono {
  background: #08090C !important;
  color: var(--fg-code) !important;
  padding: 10px 12px !important;
  border-radius: var(--radius-sm) !important;
  font-size: var(--fs-xs) !important;
  line-height: 1.55;
  margin-top: 12px;
}

/* ---- 10. LINKS / MARKS -------------------------------------------------- */

.eyebrow,
.kicker,
.section-eyebrow {
  font-family: var(--font-mono) !important;
  font-size: var(--fs-xs) !important;
  color: var(--fg-tertiary) !important;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}

/* Section kicker like "/ the course" */
.section-header .kicker,
.section-kicker {
  color: var(--fg-tertiary) !important;
  margin-bottom: 16px;
}

/* ---- 11. WIDGETS & QUIZ CARDS ------------------------------------------ */

.widget,
.widget-card,
.card,
.quiz,
.flashcard-deck {
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.widget h3,
.widget h4,
.widget-title,
.quiz h4,
.quiz-q,
.flashcard h3 {
  color: var(--fg-primary) !important;
  font-family: var(--font-sans) !important;
  font-weight: 650 !important;
  font-size: var(--fs-md) !important;
  letter-spacing: -0.012em;
  margin: 0 0 12px !important;
}

.widget p,
.quiz p,
.flashcard p {
  color: var(--fg-secondary) !important;
}

.quiz-opt,
.quiz-option,
.option {
  color: var(--fg-primary) !important;
  background: var(--bg-page) !important;
  border: 1px solid var(--rule-strong) !important;
  padding: 13px 16px !important;
  border-radius: var(--radius-sm) !important;
  font-family: var(--font-sans) !important;
  font-size: var(--fs-sm) !important;
  font-weight: 500;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  text-align: left;
}
.quiz-opt:hover { background: var(--accent-tint) !important; border-color: var(--accent) !important; }
.quiz-opt.correct { background: var(--success-tint) !important; border-color: var(--success) !important; color: var(--fg-primary) !important; }
.quiz-opt.wrong { background: var(--danger-tint) !important; border-color: var(--danger) !important; }

/* ---- 12. OUTLINE DRAWER ------------------------------------------------- */

.outline-drawer,
#outline-drawer {
  background: var(--bg-elevated) !important;
  color: var(--fg-primary) !important;
  border-left: 1px solid var(--rule) !important;
  box-shadow: var(--shadow-lg) !important;
}
.outline-drawer h3,
.outline-drawer h4 { color: var(--fg-primary) !important; }
.outline-drawer a { color: var(--fg-secondary) !important; }
.outline-drawer a.active,
.outline-drawer a[aria-current] { color: var(--fg-primary) !important; font-weight: 600 !important; }

/* ---- 13. MOTION / REVEALS TONING --------------------------------------- */

/* Disable overwrought motion tokens from older layers; keep subtle reveal. */
.reveal, [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms cubic-bezier(.2,.7,.2,1), transform 420ms cubic-bezier(.2,.7,.2,1);
}
.reveal.in, [data-reveal].in,
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal, [data-reveal] { opacity: 1; transform: none; }
}

/* ---- 14. FOCUS RINGS --------------------------------------------------- */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* ---- 15. KILL OLD GRIDLINES / AURORA / PARTICLES ----------------------- */

.aurora, .ambient-particles, .hero-grid, .hero-background,
.hero::before, .hero::after,
.bg-grid, .ambient {
  display: none !important;
  background: none !important;
  opacity: 0 !important;
}

/* ---- 16. RESPONSIVE ---------------------------------------------------- */

@media (max-width: 840px) {
  .track-block, .track { grid-template-columns: 1fr; gap: 20px; }
  .lesson-row, .track-lessons a { grid-template-columns: 44px 1fr auto; padding: 14px 16px !important; }
  .topbar-inner { padding: 10px 16px; }
  .hero, .home-hero, .page-hero { padding: 40px 16px 24px; }
  h1, .hero h1 { font-size: clamp(32px, 8vw, 44px) !important; }
}


/* ============================================================================
   APPENDED POLISH — round 2 (targeted fixes after screenshot audit)
   ============================================================================ */

/* Kill the old pip / dotted rail from motion.css */
.lesson-sidebar::before,
.lesson-sidebar ul::before,
.lesson-toc::before,
.toc .pip,
.lesson-sidebar .pip {
  display: none !important;
  content: none !important;
  background: none !important;
}

/* Rebuild the TOC sidebar cleanly */
.lesson-sidebar {
  position: sticky;
  top: 88px;
  align-self: start;
  padding: 0;
  background: transparent;
  border: none !important;
}
.lesson-sidebar .toc-head {
  font-family: var(--font-mono);
  font-size: 11px !important;
  font-weight: 600 !important;
  letter-spacing: 0.14em !important;
  text-transform: uppercase;
  color: var(--fg-tertiary) !important;
  padding-bottom: 12px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--rule-subtle);
}
.lesson-sidebar ul,
.lesson-sidebar ol {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
}
.lesson-sidebar li {
  margin: 0 !important;
  padding: 0 !important;
  list-style: none !important;
}
.lesson-sidebar li::before,
.lesson-sidebar li::marker {
  display: none !important;
  content: none !important;
}
.lesson-sidebar li a {
  display: flex !important;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 10px 8px 8px !important;
  border-radius: 6px;
  color: var(--fg-secondary) !important;
  text-decoration: none !important;
  font-family: var(--font-sans);
  font-size: 13.5px !important;
  line-height: 1.45 !important;
  font-weight: 400 !important;
  border-left: 2px solid transparent !important;
  transition: color 120ms ease, background 120ms ease, border-color 120ms ease;
  text-align: left;
  white-space: normal !important;
  word-break: normal !important;
  overflow: visible !important;
  text-overflow: clip !important;
}
.lesson-sidebar li a .n,
.lesson-sidebar li a .num,
.lesson-sidebar li a .toc-num {
  flex: 0 0 auto;
  width: 22px !important;
  font-family: var(--font-mono) !important;
  font-size: 11px !important;
  font-weight: 500 !important;
  color: var(--fg-muted) !important;
  line-height: 1.6;
  letter-spacing: 0.02em;
  padding-top: 1px;
}
.lesson-sidebar li a:hover {
  color: var(--fg-primary) !important;
  background: var(--accent-tint);
  border-left-color: var(--accent) !important;
}
.lesson-sidebar li a:hover .n,
.lesson-sidebar li a:hover .num { color: var(--accent) !important; }

.lesson-sidebar li a.active,
.lesson-sidebar li a[aria-current="true"] {
  color: var(--fg-primary) !important;
  background: var(--accent-tint);
  border-left-color: var(--accent) !important;
  font-weight: 500 !important;
}
.lesson-sidebar li a.active .n,
.lesson-sidebar li a.active .num { color: var(--accent) !important; font-weight: 600 !important; }

/* Lesson meta row (⏱ 10 min read · ◆ 3 interactives · ✦ available) */
.lesson-hero .meta,
.lesson-meta,
.lesson-meta-row {
  font-family: var(--font-mono) !important;
  font-size: 12.5px !important;
  color: var(--fg-secondary) !important;
  letter-spacing: 0.02em;
  padding-top: 12px !important;
  margin-top: 4px !important;
  border-top: 1px solid var(--rule-subtle);
}
.lesson-hero .meta b,
.lesson-meta b {
  color: var(--fg-primary) !important;
  font-weight: 600 !important;
}
.lesson-hero .meta > span,
.lesson-meta > span {
  margin-right: 16px;
}

/* Hero eyebrow — make it crisper and more commanding */
.lesson-hero .eyebrow,
.lesson-hero .lesson-eyebrow {
  font-family: var(--font-mono) !important;
  font-size: 11.5px !important;
  font-weight: 600 !important;
  letter-spacing: 0.18em !important;
  color: var(--accent) !important;
  text-transform: uppercase;
  margin-bottom: 18px !important;
  opacity: 1 !important;
}

/* Hero h1 — tighten */
.lesson-hero h1,
.lesson-hero .lesson-title {
  color: var(--fg-primary) !important;
  font-family: var(--font-sans) !important;
  font-size: clamp(32px, 4.2vw, 48px) !important;
  font-weight: 800 !important;
  line-height: 1.08 !important;
  letter-spacing: -0.02em !important;
  margin: 0 0 14px 0 !important;
}

/* Lesson subtitle/lede */
.lesson-hero .subtitle,
.lesson-hero .lesson-sub,
.lesson-hero p.lead {
  color: var(--fg-secondary) !important;
  font-family: var(--font-sans) !important;
  font-size: 18px !important;
  line-height: 1.55 !important;
  font-weight: 400 !important;
  max-width: 640px !important;
  margin: 0 0 18px 0 !important;
}

/* Home "your" in hero title — ensure it matches the rest (not secondary color) */
.hero h1 em,
.hero h1 i,
.hero h1 .word-2,
.hero h1 span:not(.hl):not(.swipe) {
  color: var(--fg-primary) !important;
  font-style: normal !important;
}

/* Home hero cyan underline on "repo" — keep crisp */
.hero h1 .hl,
.hero h1 .swipe {
  background: linear-gradient(180deg, transparent 62%, rgba(14, 106, 240, 0.22) 62%, rgba(14, 106, 240, 0.22) 92%, transparent 92%) !important;
  color: var(--fg-primary) !important;
  padding: 0 4px;
  border-radius: 2px;
}

/* Hero stats row — ensure numbers render in solid black */
.hero .stats b,
.hero-stats b,
.stat-value,
.hero-stats .stat-num {
  color: var(--fg-primary) !important;
  font-weight: 700 !important;
  opacity: 1 !important;
}

/* Topbar brand tagline */
.topbar .brand-sub,
.topbar .tagline {
  color: var(--fg-tertiary) !important;
  font-size: 11px !important;
  font-family: var(--font-mono) !important;
  letter-spacing: 0.06em;
}

/* Quiz option buttons — crisper, with better radio indicator */
.cx-quiz-option,
.quiz-option,
.cx-q-opt {
  background: var(--bg-elevated) !important;
  border: 1px solid var(--rule-strong) !important;
  border-radius: 10px !important;
  padding: 14px 16px !important;
  color: var(--fg-primary) !important;
  font-family: var(--font-sans) !important;
  font-size: 15px !important;
  font-weight: 400 !important;
  text-align: left !important;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, transform 120ms ease;
}
.cx-quiz-option:hover,
.quiz-option:hover,
.cx-q-opt:hover {
  border-color: var(--accent) !important;
  background: var(--accent-tint) !important;
}
.cx-quiz-option .letter,
.quiz-option .letter,
.cx-q-opt .k {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  background: var(--bg-page);
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--fg-secondary);
  margin-right: 10px;
}
.cx-quiz-option.correct {
  background: var(--success-tint) !important;
  border-color: var(--success) !important;
}
.cx-quiz-option.wrong {
  background: var(--danger-tint) !important;
  border-color: var(--danger) !important;
}

/* Codex-loop diagram pills on homepage */
.home-loop .pill,
.loop-step .step-num,
.codex-loop [class*="step"] {
  background: rgba(14, 106, 240, 0.16) !important;
  color: #8FB8FF !important;
  border: 1px solid rgba(14, 106, 240, 0.35);
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
}

/* Force-fix any lingering dark-on-dark or very low contrast remnants */
.home-loop .panel h3,
.loop-step h3 {
  color: #F3F2EE !important;
}
.home-loop .panel p,
.loop-step p {
  color: #C8CDD5 !important;
}
.home-loop .panel .eyebrow,
.loop-step .eyebrow {
  color: #9AA3B2 !important;
}

/* Make all links in body content use the proper accent with visible underline offset */
.lesson-content a,
.prose a {
  color: var(--accent) !important;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.lesson-content a:hover,
.prose a:hover {
  color: var(--accent-hover) !important;
  text-decoration-thickness: 2px;
}

/* Flashcard — ensure readable colors */
.cx-flashcard,
.flashcard,
.cx-card-face {
  background: var(--bg-elevated) !important;
  border: 1px solid var(--rule-strong) !important;
  color: var(--fg-primary) !important;
  box-shadow: var(--shadow-md);
}
.cx-flashcard .term,
.flashcard .term,
.cx-flashcard .eyebrow {
  color: var(--fg-tertiary) !important;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
}

/* Buttons — unify primary/secondary across the site */
.btn-primary,
a.btn-primary,
button.btn-primary,
a[class*="start-"] {
  background: var(--fg-primary) !important;
  color: var(--bg-page) !important;
  font-family: var(--font-mono) !important;
  font-size: 14px !important;
  font-weight: 500 !important;
  letter-spacing: 0.02em;
  padding: 12px 20px !important;
  border-radius: 8px !important;
  border: 1px solid var(--fg-primary) !important;
  text-decoration: none !important;
  transition: transform 120ms ease, box-shadow 120ms ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover,
a.btn-primary:hover,
.btn-primary:focus,
a.btn-primary:focus,
.btn-primary:active,
a.btn-primary:active {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--bg-page) !important;
  -webkit-text-fill-color: var(--bg-page) !important;
}
.btn-secondary,
a.btn-secondary {
  background: transparent !important;
  color: var(--fg-primary) !important;
  font-family: var(--font-mono) !important;
  font-size: 14px !important;
  font-weight: 500 !important;
  padding: 12px 20px !important;
  border-radius: 8px !important;
  border: 1px solid var(--rule-strong) !important;
  text-decoration: none !important;
  transition: all 120ms ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-secondary:hover {
  border-color: var(--fg-primary) !important;
  background: var(--bg-sunken) !important;
}


/* Final TOC width fix — ensure labels never wrap awkwardly */
.lesson-body,
.lesson-layout,
.lesson-grid {
  grid-template-columns: 280px 1fr !important;
  gap: 56px !important;
}
@media (max-width: 900px) {
  .lesson-body,
  .lesson-layout,
  .lesson-grid { grid-template-columns: 1fr !important; gap: 24px !important; }
}
.lesson-sidebar li a .n,
.lesson-sidebar li a .num {
  width: 24px !important;
  min-width: 24px !important;
}
.lesson-sidebar li a {
  padding: 9px 12px 9px 10px !important;
  font-size: 14px !important;
  line-height: 1.4 !important;
}