/* Hallmark · macrostructure: Lesson Ledger · tone: friendly classroom chalkboard meets clean editorial · anchor hue: chalk gold
 * Genre: editorial (Read mode). Canvas deep pine, ink chalk, one accent.
 * Fonts: system serif display (Iowan Old Style stack), system sans body, system mono for numerals.
 * One radius rule 10px. One accent. No kickers. Title Case headings by brief.
 */

/* ---------------- tokens ---------------- */

:root {
  --canvas: #1d332b;
  --canvas-deep: #16281f;
  --ink: #f2eee1;
  --ink-muted: rgba(242, 238, 225, 0.64);
  --ink-faint: rgba(242, 238, 225, 0.58);
  --line: rgba(242, 238, 225, 0.18);
  --line-soft: rgba(242, 238, 225, 0.1);
  --wash: rgba(242, 238, 225, 0.05);
  --wash-strong: rgba(242, 238, 225, 0.1);
  --accent: #f2c14e;
  --accent-soft: rgba(242, 193, 78, 0.14);
  --accent-ink: #1d332b;

  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --font-body: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --radius: 10px;
  --dur-fast: 120ms;
  --dur-slow: 420ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);

  --measure: 66ch;
}

/* ---------------- reset and base ---------------- */

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

html {
  overflow-x: clip;
  scroll-behavior: smooth;
}

body {
  overflow-x: clip;
  margin: 0;
  background:
    radial-gradient(1200px 500px at 85% -5%, rgba(242, 238, 225, 0.05), transparent 70%),
    radial-gradient(900px 420px at 8% 30%, rgba(242, 238, 225, 0.03), transparent 65%),
    var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

p {
  margin: 0;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--dur-fast) var(--ease-out);
}

a:hover {
  text-decoration-color: var(--accent);
}

code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 10;
  background: var(--accent);
  color: var(--accent-ink);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--dur-fast) var(--ease-out);
}

.skip-link:focus-visible {
  top: var(--space-4);
}

/* ---------------- layout frame ---------------- */

.frame {
  max-width: 76rem;
  margin: 0 auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-8));
}

.site-header {
  border-bottom: 1px solid var(--line-soft);
}

.site-header .frame {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-4) var(--space-6);
  padding-block: var(--space-5);
}

.wordmark {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.sim-badge {
  display: inline-block;
  margin-left: var(--space-3);
  padding: 2px 10px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0;
  vertical-align: 3px;
  white-space: nowrap;
}

.lesson-nav {
  margin-left: auto;
}

.lesson-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.lesson-nav a {
  font-size: 0.95rem;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: border-color var(--dur-fast) var(--ease-out);
}

.lesson-nav a:hover,
.lesson-nav a:focus-visible {
  border-bottom-color: var(--accent);
}

/* ---------------- hero ---------------- */

.hero {
  padding-block: clamp(var(--space-8), 11vh, var(--space-9)) var(--space-8);
}

.hero h1 {
  font-size: clamp(2.7rem, 6.4vw, 4.9rem);
  letter-spacing: -0.03em;
  max-width: 15ch;
}

.hero h1 .turn {
  color: var(--accent);
}

.hero-lede {
  margin-top: var(--space-5);
  max-width: var(--measure);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  color: var(--ink-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.hero-note {
  font-size: 0.92rem;
  color: var(--ink-faint);
}

.hero-meter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-8);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--line-soft);
}

.hero-stat .numeral {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 4.5vw, 3.4rem);
  font-weight: 500;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.hero-stat .label {
  display: block;
  margin-top: var(--space-2);
  font-size: 0.92rem;
  color: var(--ink-muted);
}

/* ---------------- lessons ---------------- */

.lesson {
  border-top: 1px solid var(--line-soft);
  padding-block: var(--space-8) var(--space-9);
}

.lesson-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(var(--space-4), 3vw, var(--space-6));
  margin-bottom: var(--space-7);
}

.lesson-numeral {
  font-family: var(--font-display);
  font-size: clamp(4.4rem, 9vw, 7.5rem);
  font-weight: 600;
  line-height: 0.9;
  color: var(--ink-faint);
  user-select: none;
  flex: none;
}

.lesson-head h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  padding-top: clamp(0.4rem, 1.4vw, 1.1rem);
}

.lesson-lead {
  margin-top: var(--space-3);
  max-width: var(--measure);
  color: var(--ink-muted);
}

/* ---------------- shared controls ---------------- */

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 18px;
  background: transparent;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.btn:hover {
  background: var(--ink);
  color: var(--canvas);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--canvas);
}

.btn-quiet {
  border-color: var(--line);
  color: var(--ink-muted);
  font-weight: 500;
}

.btn-quiet:hover {
  background: var(--wash-strong);
  border-color: var(--ink-muted);
  color: var(--ink);
}

.field-label {
  display: block;
  font-weight: 600;
  font-size: 0.98rem;
  margin-bottom: var(--space-2);
}

.field-help {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-top: var(--space-1);
  line-height: 1.45;
}

textarea,
input[type="text"],
input[type="number"],
select {
  width: 100%;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  caret-color: var(--accent);
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

textarea {
  resize: vertical;
  min-height: 6.5em;
  line-height: 1.55;
}

textarea:hover,
input:hover,
select:hover {
  border-color: var(--ink-muted);
}

textarea:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  height: 28px;
  cursor: pointer;
}

input[type="radio"],
input[type="checkbox"] {
  accent-color: var(--accent);
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.slider-row {
  margin-top: var(--space-5);
}

.slider-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
}

.slider-head output {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 500;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.chip-set {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip-btn {
  padding: 7px 14px;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.92rem;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.chip-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.chip-btn[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}

.panel {
  background: var(--wash);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: clamp(var(--space-4), 2.5vw, var(--space-6));
}

.panel + .panel {
  margin-top: var(--space-5);
}

/* ---------------- lesson 1, token table ---------------- */

.token-readout {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-8);
  align-items: flex-end;
}

.big-stat .numeral {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(3rem, 6vw, 4.6rem);
  font-weight: 500;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.big-stat .label {
  display: block;
  margin-top: var(--space-1);
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.big-stat .sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--ink-faint);
  margin-top: 2px;
}

.price-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-4);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line-soft);
}

.price-field {
  width: 15rem;
}

.token-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
}

.token-chips li {
  min-height: 24px;
}

.tok {
  display: inline-block;
  padding: 5px 9px;
  border-radius: 6px;
  background: var(--wash-strong);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.2;
  white-space: pre;
  transition: transform var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.tok:hover {
  transform: translateY(-2px);
  background: var(--accent-soft);
}

.tok-subword {
  background: transparent;
  border: 1px dashed var(--ink-faint);
}

.tok-punct {
  background: transparent;
  color: var(--ink-muted);
}

.token-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin-top: var(--space-4);
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.token-legend .swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  margin-right: 6px;
  vertical-align: -2px;
}

.swatch-word {
  background: var(--wash-strong);
}

.swatch-sub {
  border: 1px dashed var(--ink-faint);
}

.swatch-punct {
  background: transparent;
  border: 1px solid var(--line);
}

/* ---------------- lesson 2, temperature ---------------- */

.temp-grid {
  display: grid;
  grid-template-columns: minmax(280px, 5fr) minmax(280px, 6fr);
  gap: var(--space-6);
  align-items: start;
}

.dial-svg {
  width: 100%;
  max-width: 420px;
  height: auto;
  display: block;
  margin: 0 auto;
}

.dial-zone {
  fill: none;
  stroke-width: 10;
  stroke-linecap: round;
  opacity: 0.35;
}

.dial-zone-active {
  opacity: 1;
  stroke: var(--accent);
}

.dial-zone-predict {
  stroke: var(--ink-faint);
}

.dial-zone-balanced {
  stroke: var(--ink-muted);
}

.dial-zone-adventure {
  stroke: var(--ink-faint);
}

.dial-tick {
  stroke: var(--ink-muted);
  stroke-width: 2;
}

.dial-label {
  font-family: var(--font-body);
  font-size: 13px;
  fill: var(--ink-muted);
}

.dial-num {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--ink-faint);
}

.needle-group {
  transform-origin: 100px 100px;
  transition: transform var(--dur-slow) var(--ease-out);
}

.needle-line {
  stroke: var(--accent);
  stroke-width: 4;
  stroke-linecap: round;
}

.needle-hub {
  fill: var(--accent);
}

.regime-line {
  margin-top: var(--space-4);
  font-size: 0.98rem;
  color: var(--ink-muted);
  min-height: 3.2em;
}

.regime-line strong {
  color: var(--ink);
  font-weight: 600;
}

.dist-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.dist-row {
  display: grid;
  grid-template-columns: 7.5em 1fr 4.2em;
  align-items: center;
  gap: var(--space-3);
}

.dist-word {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dist-track {
  height: 18px;
  background: var(--wash-strong);
  border-radius: 6px;
  overflow: hidden;
}

.dist-fill {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--ink-faint);
  border-radius: 6px;
  transform-origin: left center;
  transition: transform var(--dur-slow) var(--ease-out);
}

.dist-row-top .dist-fill {
  background: var(--accent);
}

.dist-row-top .dist-word {
  color: var(--accent);
}

.dist-pct {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--ink-muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.dist-caption {
  margin-top: var(--space-3);
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.sample-tray {
  margin-top: var(--space-6);
}

.sample-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.seed-field {
  width: 9rem;
}

.sample-list {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.sample-list li {
  padding: 10px 14px;
  background: var(--wash-strong);
  border-left: none;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.98rem;
  animation: chalk-in var(--dur-slow) var(--ease-out) both;
}

.sample-list li:nth-child(2) {
  animation-delay: 90ms;
}

.sample-list li:nth-child(3) {
  animation-delay: 180ms;
}

@keyframes chalk-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------------- lesson 3, context window ---------------- */

.window-grid {
  display: grid;
  gap: var(--space-5);
}

.window-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-4);
}

.limit-field {
  width: 11rem;
}

.meter-block {
  margin-top: var(--space-2);
}

.meter {
  display: flex;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--wash);
  overflow: hidden;
}

.meter-seg {
  height: 100%;
  border-right: 1px solid var(--canvas);
}

.meter-seg:last-child {
  border-right: none;
}

.seg-system {
  background: var(--accent);
}

.seg-user {
  background: rgba(242, 238, 225, 0.5);
}

.seg-assistant {
  background: rgba(242, 238, 225, 0.22);
}

.meter-scale {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.window-status {
  margin-top: var(--space-4);
  font-size: 1rem;
  color: var(--ink-muted);
}

.window-status strong {
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 500;
}

.window-status .over {
  color: var(--accent);
  font-weight: 600;
}

.strategy-set {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line-soft);
}

.radio-row {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.95rem;
  cursor: pointer;
}

.message-list {
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.message-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-4);
  padding: 12px 16px;
  background: var(--wash-strong);
  border-radius: var(--radius);
  transition: opacity var(--dur-slow) var(--ease-out);
}

.message-row .role {
  flex: none;
  width: 6.2em;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.message-row .role-system {
  color: var(--accent);
}

.message-row .text {
  flex: 1 1 14rem;
  min-width: 0;
  overflow-wrap: anywhere;
}

.message-row .count {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.message-row .fate {
  flex: none;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
}

.fate-kept {
  border-color: transparent;
  background: var(--accent-soft);
  color: var(--accent);
}

.fate-dropped {
  color: var(--ink-faint);
  text-decoration: line-through;
}

.message-row.is-dropped {
  opacity: 0.45;
}

.message-row.is-dropped .text {
  text-decoration: line-through;
  text-decoration-color: var(--ink-faint);
}

.message-row.is-stub {
  background: var(--accent-soft);
}

/* ---------------- lesson 4, prompt builder ---------------- */

.builder-grid {
  display: grid;
  grid-template-columns: minmax(300px, 5fr) minmax(300px, 6fr);
  gap: var(--space-6);
  align-items: start;
}

.builder-form {
  display: grid;
  gap: var(--space-5);
}

.format-field select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-muted) 50%),
    linear-gradient(135deg, var(--ink-muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 55%, calc(100% - 12px) 55%;
  background-size: 6px 6px;
  background-repeat: no-repeat;
  padding-right: 36px;
}

.preview-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.preview-head h3 {
  font-size: 1.25rem;
}

.preview-count {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
}

.prompt-preview {
  margin: 0;
  padding: var(--space-5);
  background: var(--canvas-deep);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  min-height: 12em;
}

.prompt-preview .part {
  display: block;
}

.part-tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-ink);
  background: var(--accent);
  border-radius: 4px;
  padding: 1px 7px;
  margin-right: 8px;
  vertical-align: 1px;
}

.prompt-empty {
  color: var(--ink-faint);
}

.part-notes {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.part-notes li strong {
  color: var(--ink);
  font-weight: 600;
}

.builder-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.builder-foot .numeral {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 3.6vw, 2.8rem);
  font-weight: 500;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.builder-foot .label {
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.copy-note {
  font-size: 0.88rem;
  color: var(--accent);
  min-width: 6em;
}

/* ---------------- explainer between lessons ---------------- */

.aside-note {
  margin-top: var(--space-6);
  padding: var(--space-4) var(--space-5);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--ink-muted);
  max-width: var(--measure);
}

.aside-note strong {
  color: var(--ink);
}

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

.site-footer {
  border-top: 1px solid var(--line-soft);
  padding-block: var(--space-7);
}

.site-footer .frame {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-8);
  justify-content: space-between;
}

.site-footer p {
  max-width: 46ch;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.site-footer .byline {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink);
}

/* ---------------- responsive ---------------- */

@media (max-width: 900px) {
  .temp-grid,
  .builder-grid {
    grid-template-columns: 1fr;
  }

  .lesson-nav {
    margin-left: 0;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 1rem;
  }

  .lesson {
    padding-block: var(--space-7);
  }

  .lesson-head {
    flex-direction: column;
    gap: var(--space-2);
  }

  .lesson-numeral {
    font-size: 3.4rem;
    line-height: 1;
  }

  .lesson-head h2 {
    padding-top: 0;
  }

  .dist-row {
    grid-template-columns: 6em 1fr 3.6em;
  }

  .message-row .role {
    width: auto;
  }

  .meter {
    height: 36px;
  }
}

/* ---------------- reduced motion ---------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
    animation-delay: 0ms !important;
  }
}