:root,
[data-theme="beige"] {
  color-scheme: light;
  --ink: #1b2430;
  --ink-soft: #4d5a68;
  --paper: #efe6d6;
  --panel: #fbf7ef;
  --header-bg: #fbf7ef;
  --raised: #ffffff;
  --raised-hover: #f4efe6;
  --field-bg: #ffffff;
  --field-ink: #1b2430;
  --inset: #ffffff;
  --control-h: 40px;
  --inset-ok: #dcefe3;
  --inset-miss: #f6e4d8;
  --well-bg: #1d2d3c;
  --well-ink: #f4efe6;
  --well-line: #4a5d70;
  --line: #d7ccb8;
  --accent: #c45c26;
  --accent-dark: #9a3f12;
  --on-accent: #fff7ef;
  --teal: #1c6b73;
  --ok: #2c6e49;
  --on-ok: #f4fff7;
  --card: var(--panel);
  --muted: var(--ink-soft);
  --stage-bg: #0f1a24;
  --stage-canvas: #132230;
  --well-btn: #2a3b4d;
  --well-btn-hover: #33485e;
  --well-soft: #c9d6e2;
  --chip-active-bg: color-mix(in srgb, var(--accent) 16%, var(--raised));
  --chip-active-ink: var(--well-ink);
  --hero-visual: #eaf4fb;
  --sky-0: #8ec4e6;
  --sky-1: #e7f3fb;
  --ground: #6f8f63;
  --soil: #5a4634;
  --vx: #1c6b73;
  --vy: #3d5a80;
  --v0: #c9a227;
  --g: #b42318;
  --shadow: 0 1px 0 rgba(27, 36, 48, 0.06);
  --paper-wash: radial-gradient(1200px 400px at 10% -10%, #f7efe0, transparent);
  --spot: #c45c26;
  --spot-dim: rgba(27, 36, 48, 0.28);
  --control-border-width: 1px;
  --radius: 14px;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Figtree", "Segoe UI", sans-serif;
  --serif: "Fraunces", Georgia, serif;
}

[data-theme="light"] {
  color-scheme: light;
  --ink: #1a1f26;
  --ink-soft: #4a5563;
  --paper: #f3f5f8;
  --panel: #ffffff;
  --header-bg: #ffffff;
  --raised: #ffffff;
  --raised-hover: #e8edf3;
  --field-bg: #ffffff;
  --field-ink: #1a1f26;
  --inset: #e7ebf0;
  --inset-ok: #d5eee0;
  --inset-miss: #f3ddd4;
  --well-bg: #1d2d3c;
  --well-ink: #f4efe6;
  --well-line: #4a5d70;
  --line: #cfd6df;
  --accent: #b44b1c;
  --accent-dark: #8a3410;
  --on-accent: #fff7ef;
  --teal: #0f5f68;
  --ok: #1f6b3a;
  --on-ok: #f4fff7;
  --shadow: 0 1px 0 rgba(26, 31, 38, 0.06);
  --paper-wash: none;
  --spot: #b44b1c;
  --spot-dim: rgba(26, 31, 38, 0.32);
  --stage-bg: #101820;
  --stage-canvas: #15202b;
  --well-btn: #2a3b4d;
  --well-btn-hover: #33485e;
  --well-soft: #c9d6e2;
  --chip-active-bg: color-mix(in srgb, var(--accent) 14%, var(--raised));
  --chip-active-ink: var(--well-ink);
  --hero-visual: #e8eef4;
}

[data-theme="dark"] {
  color-scheme: dark;
  --ink: #e8eef4;
  --ink-soft: #a8b4c0;
  --paper: #12171e;
  --panel: #1c2430;
  --header-bg: #1c2430;
  --raised: #243041;
  --raised-hover: #2e3d52;
  --field-bg: #12171e;
  --field-ink: #e8eef4;
  --inset: #12171e;
  --inset-ok: #143024;
  --inset-miss: #3a1c14;
  --well-bg: #12171e;
  --well-ink: #e8eef4;
  --well-line: #3a4a5c;
  --line: #3a4a5c;
  --accent: #e07a3d;
  --accent-dark: #f0a202;
  --on-accent: #1b2430;
  --teal: #7ec8d0;
  --ok: #7dca9a;
  --on-ok: #102016;
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
  --paper-wash: none;
  --spot: #f0a202;
  --spot-dim: rgba(0, 0, 0, 0.55);
  --stage-bg: #0d1218;
  --stage-canvas: #12171e;
  --well-btn: #243041;
  --well-btn-hover: #2e3d52;
  --well-soft: #a8b4c0;
  --chip-active-bg: color-mix(in srgb, var(--accent) 20%, var(--raised));
  --chip-active-ink: var(--well-ink);
  --hero-visual: #12171e;
}

[data-theme="contrast"] {
  color-scheme: dark;
  --ink: #ffffff;
  --ink-soft: #ffffff;
  --paper: #000000;
  --panel: #000000;
  --header-bg: #000000;
  --raised: #000000;
  --raised-hover: #1a1a1a;
  --field-bg: #000000;
  --field-ink: #ffffff;
  --inset: #000000;
  --inset-ok: #000000;
  --inset-miss: #000000;
  --well-bg: #000000;
  --well-ink: #ffffff;
  --well-line: #ffffff;
  --line: #ffffff;
  --accent: #ffff00;
  --accent-dark: #ffff00;
  --on-accent: #000000;
  --teal: #ffff00;
  --ok: #00ff00;
  --on-ok: #000000;
  --shadow: none;
  --paper-wash: none;
  --spot: #ffff00;
  --spot-dim: rgba(0, 0, 0, 0.72);
  --control-border-width: 2px;
  --stage-bg: #000000;
  --stage-canvas: #000000;
  --well-btn: #000000;
  --well-btn-hover: #1a1a1a;
  --well-soft: #ffffff;
  --chip-active-bg: #000000;
  --chip-active-ink: #ffffff;
  --hero-visual: #000000;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background-color: var(--paper);
  background-image: var(--paper-wash);
  color: var(--ink);
  font-family: var(--sans);
}

:root:fullscreen,
:root:-webkit-full-screen,
html:fullscreen,
html:-webkit-full-screen,
html.is-fullscreen,
body:fullscreen,
body:-webkit-full-screen,
body.is-fullscreen {
  background-color: var(--paper) !important;
  background-image: var(--paper-wash);
  color: var(--ink) !important;
  overflow: auto !important;
  height: auto !important;
  max-height: none !important;
  min-height: 100% !important;
}

:root:fullscreen::backdrop,
:root:-webkit-full-screen::backdrop,
html:fullscreen::backdrop,
html:-webkit-full-screen::backdrop,
body:fullscreen::backdrop,
body:-webkit-full-screen::backdrop {
  background-color: var(--paper);
}

button,
input,
label,
select,
textarea {
  font-family: inherit;
}

input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="file"]):not([type="button"]):not([type="submit"]),
textarea,
select {
  background-color: var(--field-bg);
  color: var(--field-ink);
  border: var(--control-border-width, 1px) solid var(--line);
  border-radius: 8px;
  color-scheme: inherit;
}

input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus,
textarea:-webkit-autofill {
  -webkit-text-fill-color: var(--field-ink);
  caret-color: var(--field-ink);
  box-shadow: 0 0 0 1000px var(--field-bg) inset;
  transition: background-color 99999s ease-out;
}

.app {
  max-width: 1440px;
  margin: 0 auto;
  padding: 20px 20px 48px;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 20px;
  align-items: end;
  margin-bottom: 18px;
}

.kicker {
  margin: 0 0 4px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--teal);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 650;
}

h1 {
  font-size: clamp(1.7rem, 2.4vw, 2.35rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.05rem;
}

.guiding {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.45;
  max-width: 42em;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0 0 16px;
}

.tab {
  appearance: none;
  box-sizing: border-box;
  height: var(--control-h);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: var(--control-border-width, 1px) solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 999px;
  padding: 0 1.05rem;
  font-weight: 650;
  font-size: 0.95rem;
  cursor: pointer;
}

.tab.active {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

.tab:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.switch.light {
  color: var(--well-ink);
  white-space: nowrap;
}

.givens {
  margin: 8px 0 0;
  display: grid;
  gap: 4px;
}

.givens div {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.88rem;
}

.givens dt {
  color: var(--ink-soft);
}

.givens dd {
  margin: 0;
  font-family: var(--mono);
}

.theory-link {
  margin: 0;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.text-link {
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  color: var(--teal);
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
}

.theory {
  display: grid;
  gap: 16px;
}

.theory-hero,
.theory-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.theory-hero h2,
.theory-block h3 {
  margin-bottom: 8px;
}

.theory-block h4 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 1rem;
}

.theory-hero p,
.theory-block p,
.theory-block li {
  color: var(--ink-soft);
  line-height: 1.5;
  font-size: 0.95rem;
}

.theory-block ul {
  margin: 8px 0 0;
  padding-left: 1.15rem;
}

.theory-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}

.theory-conditions {
  margin: 0 0 10px;
}

.theory-graphs {
  margin-top: 8px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 16px;
  align-items: start;
}

.stage {
  background: var(--stage-bg);
  border-radius: 18px;
  overflow: hidden;
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: min(62vh, 620px);
  min-height: 480px;
  max-height: 620px;
}

#sim-canvas {
  display: block;
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  height: auto;
  background: var(--stage-canvas);
}

.projectile-stage #sim-canvas {
  flex: none;
  height: min(52vh, 420px);
  min-height: 320px;
}

.transport {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 12px;
  background: var(--well-bg);
  border-top: var(--control-border-width, 1px) solid var(--well-line);
}

.transport .switch {
  min-height: var(--control-h);
  display: inline-flex;
  align-items: center;
}

.transport .chip {
  box-sizing: border-box;
  height: var(--control-h);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.85rem;
}

.transport-gap {
  flex: 1;
  min-width: 8px;
}

.btn {
  appearance: none;
  box-sizing: border-box;
  height: var(--control-h);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: var(--control-border-width, 1px) solid var(--line);
  background: var(--raised);
  color: var(--ink);
  border-radius: 999px;
  padding: 0 0.95rem;
  font-weight: 600;
  font-size: 0.92rem;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
}

.btn:hover {
  background: var(--raised-hover);
}

.btn:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

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

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

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn.ghost:hover {
  background: var(--raised-hover);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.rail {
  display: grid;
  gap: 12px;
  align-content: start;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 14px 12px;
  box-shadow: var(--shadow);
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.control {
  margin-top: 12px;
}

.control-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 600;
}

.readout {
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--accent-dark);
}

input[type="range"] {
  width: 100%;
  margin: 8px 0 0;
  accent-color: var(--accent);
}

.planet-bg-switch {
  margin-top: 10px;
}

.control .caption {
  margin-top: 8px;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: var(--control-border-width, 1px) solid var(--line);
  background: var(--raised);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

.chip:has(.chip-icon) {
  padding-left: 0.45rem;
  padding-right: 0.65rem;
}

.chip-icon {
  width: 1rem;
  height: 1rem;
  flex: none;
  display: block;
}

.planet-icon {
  overflow: visible;
}

.stage .chip,
.track-controls .chip,
.transport .chip {
  min-height: 2rem;
  padding: 0.28rem 0.72rem;
  background: color-mix(in srgb, var(--well-ink) 12%, var(--well-btn));
  color: var(--well-ink);
  border-color: color-mix(in srgb, var(--well-ink) 30%, var(--well-line));
  font-weight: 650;
}

.stage .chip:hover,
.track-controls .chip:hover,
.transport .chip:hover {
  background: color-mix(in srgb, var(--well-ink) 18%, var(--well-btn));
  border-color: var(--accent);
  color: var(--accent);
}

.stage .chip.active,
.track-controls .chip.active,
.transport .chip.active {
  background: color-mix(in srgb, var(--accent) 32%, var(--well-bg));
  border-color: var(--accent);
  color: var(--chip-active-ink);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 55%, transparent);
}

.gravity-stage .presets .chip,
.gravity-stage #height-presets .chip {
  min-height: 2.15rem;
  padding-inline: 0.8rem;
  background: color-mix(in srgb, var(--well-ink) 16%, var(--well-btn));
  border-color: color-mix(in srgb, var(--well-ink) 38%, var(--well-line));
}

.stage .chip:has(.chip-icon),
.track-controls .chip:has(.chip-icon),
.transport .chip:has(.chip-icon) {
  padding-left: 0.5rem;
}

.chip[data-planet] {
  --planet-sky: var(--well-btn);
  --planet-sky-2: var(--well-btn);
  --planet-ground: var(--well-btn);
  --planet-ground-2: var(--well-btn);
  position: relative;
  isolation: isolate;
  overflow: hidden;
  color: var(--well-ink);
  border-color: color-mix(in srgb, var(--planet-ground) 42%, var(--well-line));
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--planet-sky) 36%, var(--well-btn)) 0%,
      color-mix(in srgb, var(--planet-sky-2) 26%, var(--well-btn)) 54%,
      color-mix(in srgb, var(--planet-ground) 32%, var(--well-btn)) 55%,
      color-mix(in srgb, var(--planet-ground-2) 40%, var(--well-btn)) 100%
    );
}

.chip[data-planet]::before {
  content: "";
  position: absolute;
  left: -0.4rem;
  top: 50%;
  width: 1.9rem;
  height: 1.9rem;
  transform: translateY(-50%);
  border-radius: 50%;
  background:
    radial-gradient(
      circle at 32% 30%,
      color-mix(in srgb, var(--planet-sky) 70%, white) 0%,
      var(--planet-sky-2) 45%,
      var(--planet-ground) 78%
    );
  opacity: 0.38;
  pointer-events: none;
  z-index: 0;
}

.chip[data-planet] .planet-icon {
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 0 0.7px rgba(0, 0, 0, 0.55)) drop-shadow(0 0 0.7px rgba(255, 255, 255, 0.4));
}

.stage .chip[data-planet]:hover,
.track-controls .chip[data-planet]:hover,
.chip[data-planet]:hover {
  color: var(--well-ink);
  border-color: color-mix(in srgb, var(--planet-sky) 50%, var(--accent));
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--planet-sky) 48%, var(--well-btn)) 0%,
      color-mix(in srgb, var(--planet-sky-2) 36%, var(--well-btn)) 54%,
      color-mix(in srgb, var(--planet-ground) 44%, var(--well-btn)) 55%,
      color-mix(in srgb, var(--planet-ground-2) 50%, var(--well-btn)) 100%
    );
}

.stage .chip[data-planet]:hover::before,
.track-controls .chip[data-planet]:hover::before,
.chip[data-planet]:hover::before {
  opacity: 0.52;
}

.stage .chip[data-planet].active,
.track-controls .chip[data-planet].active,
.chip[data-planet].active {
  color: var(--well-ink);
  border-color: color-mix(in srgb, var(--planet-sky) 45%, var(--accent));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--planet-sky) 50%, transparent);
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--planet-sky) 58%, var(--well-btn)) 0%,
      color-mix(in srgb, var(--planet-sky-2) 44%, var(--well-btn)) 54%,
      color-mix(in srgb, var(--planet-ground) 52%, var(--well-btn)) 55%,
      color-mix(in srgb, var(--planet-ground-2) 58%, var(--well-btn)) 100%
    );
}

.stage .chip[data-planet].active::before,
.track-controls .chip[data-planet].active::before,
.chip[data-planet].active::before {
  opacity: 0.62;
}

[data-theme="contrast"] .chip[data-planet],
[data-theme="contrast"] .chip[data-planet]:hover,
[data-theme="contrast"] .chip[data-planet].active {
  background: #000;
  color: #fff;
  border-color: #fff;
  box-shadow: none;
}

[data-theme="contrast"] .chip[data-planet]::before {
  display: none;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

.chip.active {
  background: var(--chip-active-bg);
  border-color: var(--accent);
  color: var(--accent-dark);
}

.chip:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.card-head .switch {
  flex-shrink: 0;
  white-space: nowrap;
}

.metrics {
  display: grid;
  gap: 6px;
  margin: 10px 0 0;
}

.metrics > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 4px;
}

.metrics dt {
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.metrics dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.86rem;
  font-weight: 500;
}

.subhead {
  margin: 14px 0 0;
  font-size: 0.86rem;
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--teal);
}

.finals dd {
  color: var(--ok);
}

.debug {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

.switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.challenge-q {
  margin: 8px 0 6px;
  font-weight: 600;
}

.challenge-target {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.05rem;
}

.muted {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.feedback {
  margin: 10px 0 0;
  padding: 8px 10px;
  background: var(--inset);
  color: var(--ink);
  border: var(--control-border-width, 1px) solid var(--line);
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.4;
}

.feedback.hit {
  background: var(--inset-ok);
}

.feedback.miss {
  background: var(--inset-miss);
}

.challenge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 10px;
}

.transport .btn,
.track-controls .btn {
  background: var(--well-btn);
  color: var(--well-ink);
  border-color: var(--well-line);
}

.transport .btn:hover,
.track-controls .btn:hover {
  background: var(--well-btn-hover);
}

.transport .btn.primary,
.track-controls .btn.primary {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

.transport .btn.primary:hover,
.track-controls .btn.primary:hover {
  background-color: var(--accent-dark);
  border-color: var(--accent-dark);
}

.transport .btn.ghost,
.track-controls .btn.ghost {
  background: transparent;
  color: var(--well-ink);
  border-color: var(--well-line);
}

.transport .btn.ghost:hover,
.track-controls .btn.ghost:hover {
  background: var(--well-btn);
}

.notes-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: 0;
  padding: 0;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 650;
  cursor: pointer;
}

.chevron {
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(45deg);
  transition: transform 0.15s ease;
}

.notes-toggle[aria-expanded="false"] .chevron {
  transform: rotate(-45deg);
}

.notes[hidden] {
  display: none;
}

.notes h3 {
  margin: 12px 0 4px;
  font-size: 0.92rem;
}

.notes p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.45;
}

.eq,
.eq-block {
  font-family: var(--mono);
  color: var(--ink);
}

.eq-block {
  margin: 8px 0;
  padding: 8px 10px;
  background: var(--field-bg);
  color: var(--field-ink);
  border: var(--control-border-width, 1px) solid var(--line);
  border-radius: 8px;
}

.teacher {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.lab-bottom {
  margin-top: 16px;
  display: grid;
  gap: 16px;
}

.graphs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.graph-wrap,
.table-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}

.graph-wrap canvas {
  width: 100%;
  height: 240px;
  display: block;
  margin-top: 8px;
}

.caption {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.table-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  flex-wrap: wrap;
}

.table-scroll {
  overflow-x: auto;
  margin-top: 10px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  text-align: right;
  padding: 8px 8px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

th:first-child,
td:first-child,
.empty-row td {
  text-align: left;
}

.empty-row td {
  color: var(--ink-soft);
  font-style: italic;
}

tbody tr.best td {
  color: var(--ok);
  font-weight: 600;
}

@media (max-width: 1100px) {
  .workspace,
  .topbar,
  .graphs,
  .graphs.graphs-three,
  .theory-split {
    grid-template-columns: 1fr;
  }

  .stage {
    height: min(52vh, 520px);
    min-height: 400px;
    max-height: 520px;
  }
}

@media (max-width: 700px) {
  .app {
    padding: 12px 12px 32px;
  }

  .transport .btn {
    padding-inline: 0.9rem;
  }
}

[data-theme="contrast"] a,
[data-theme="contrast"] .text-link {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

[data-theme="contrast"] .site-nav a.is-active {
  text-decoration: underline;
}

.btn.has-icon,
a.btn.has-icon {
  gap: 0.4rem;
  padding-inline: 0.78rem 0.95rem;
  overflow: visible;
}

.btn-label {
  display: inline-block;
}

.btn-icon {
  width: 1rem;
  height: 1rem;
  flex: none;
  display: block;
  overflow: visible;
}

.btn.primary {
  background-image:
    linear-gradient(180deg, color-mix(in srgb, white 18%, transparent), transparent 46%),
    repeating-linear-gradient(
      -22deg,
      transparent 0 3px,
      color-mix(in srgb, black 6%, transparent) 3px 4px
    );
  box-shadow: inset 0 1px 0 color-mix(in srgb, white 22%, transparent);
}

.btn.action-check {
  background: color-mix(in srgb, var(--ok) 18%, var(--raised));
  border-color: color-mix(in srgb, var(--ok) 55%, var(--line));
  color: var(--ok);
}

.btn.action-check.primary {
  background-color: var(--ok);
  background-image:
    linear-gradient(180deg, color-mix(in srgb, white 18%, transparent), transparent 46%),
    repeating-linear-gradient(
      -22deg,
      transparent 0 3px,
      color-mix(in srgb, black 6%, transparent) 3px 4px
    );
  border-color: var(--ok);
  color: var(--on-ok);
}

.btn.action-pause,
.btn.action-step,
.btn.action-record,
.btn.action-nudge-left,
.btn.action-nudge-right {
  border-color: color-mix(in srgb, var(--teal) 48%, var(--line));
  color: var(--teal);
}

.btn.action-reset,
.btn.action-guided,
.btn.action-shuffle,
.btn.action-friction {
  border-color: color-mix(in srgb, var(--accent) 42%, var(--line));
  color: var(--accent-dark);
}

.btn.action-howto,
.btn.action-reveal,
.btn.action-add,
.btn.action-prev {
  border-color: color-mix(in srgb, var(--teal) 42%, var(--line));
  color: var(--teal);
}

.btn.action-clear {
  border-color: color-mix(in srgb, var(--ink-soft) 50%, var(--line));
  color: var(--ink-soft);
}

.transport .btn.action-play,
.track-controls .btn.action-play,
.transport .btn.action-launch,
.track-controls .btn.action-launch {
  background-color: var(--accent);
  background-image:
    linear-gradient(180deg, color-mix(in srgb, white 16%, transparent), transparent 46%),
    repeating-linear-gradient(
      -22deg,
      transparent 0 3px,
      color-mix(in srgb, black 8%, transparent) 3px 4px
    );
  color: var(--on-accent);
  border-color: var(--accent);
}

.transport .btn.action-pause,
.track-controls .btn.action-pause {
  background: color-mix(in srgb, var(--teal) 26%, var(--well-btn));
  border-color: color-mix(in srgb, var(--teal) 55%, var(--well-line));
  color: var(--well-ink);
}

.transport .btn.action-step,
.track-controls .btn.action-step,
.transport .btn.action-nudge-left,
.track-controls .btn.action-nudge-left,
.transport .btn.action-nudge-right,
.track-controls .btn.action-nudge-right {
  background: color-mix(in srgb, var(--teal) 14%, var(--well-btn));
  border-color: color-mix(in srgb, var(--teal) 40%, var(--well-line));
  color: var(--well-ink);
}

.transport .btn.action-check,
.track-controls .btn.action-check {
  background-color: color-mix(in srgb, var(--ok) 78%, var(--well-bg));
  background-image:
    linear-gradient(180deg, color-mix(in srgb, white 14%, transparent), transparent 46%),
    repeating-linear-gradient(
      -22deg,
      transparent 0 3px,
      color-mix(in srgb, black 8%, transparent) 3px 4px
    );
  border-color: var(--ok);
  color: var(--on-ok);
}

.transport .btn.action-reset,
.track-controls .btn.action-reset {
  background: color-mix(in srgb, var(--accent) 22%, var(--well-btn));
  border-color: color-mix(in srgb, var(--accent) 50%, var(--well-line));
  color: var(--well-ink);
}

.transport .btn.action-record,
.track-controls .btn.action-record {
  background: color-mix(in srgb, var(--teal) 20%, var(--well-btn));
  border-color: color-mix(in srgb, var(--teal) 48%, var(--well-line));
  color: var(--well-ink);
}

.transport .btn.action-add,
.track-controls .btn.action-add {
  background: color-mix(in srgb, var(--teal) 18%, var(--well-btn));
  border-color: color-mix(in srgb, var(--teal) 45%, var(--well-line));
  color: var(--well-ink);
}

.transport .btn.action-friction,
.track-controls .btn.action-friction {
  background: color-mix(in srgb, var(--accent) 16%, var(--well-btn));
  border-color: color-mix(in srgb, var(--accent) 42%, var(--well-line));
  color: var(--well-ink);
}

.transport .btn.action-clear,
.track-controls .btn.action-clear {
  background: color-mix(in srgb, black 12%, var(--well-btn));
  border-color: color-mix(in srgb, var(--well-soft) 35%, var(--well-line));
  color: var(--well-soft);
}

.btn.action-check.primary:hover,
.transport .btn.action-check:hover,
.track-controls .btn.action-check:hover {
  background-color: color-mix(in srgb, var(--ok) 78%, black);
  background-image:
    linear-gradient(180deg, color-mix(in srgb, white 12%, transparent), transparent 46%);
  border-color: var(--ok);
  color: var(--on-ok);
}

.transport .btn.action-play:hover,
.track-controls .btn.action-play:hover,
.transport .btn.action-launch:hover,
.track-controls .btn.action-launch:hover {
  background-color: var(--accent-dark);
  border-color: var(--accent-dark);
}

.transport .btn.action-pause:hover,
.track-controls .btn.action-pause:hover,
.transport .btn.action-step:hover,
.track-controls .btn.action-step:hover,
.transport .btn.action-record:hover,
.track-controls .btn.action-record:hover,
.transport .btn.action-add:hover,
.track-controls .btn.action-add:hover,
.transport .btn.action-nudge-left:hover,
.track-controls .btn.action-nudge-left:hover,
.transport .btn.action-nudge-right:hover,
.track-controls .btn.action-nudge-right:hover {
  background: color-mix(in srgb, var(--teal) 34%, var(--well-btn));
}

.transport .btn.action-reset:hover,
.track-controls .btn.action-reset:hover,
.transport .btn.action-friction:hover,
.track-controls .btn.action-friction:hover {
  background: color-mix(in srgb, var(--accent) 30%, var(--well-btn));
}

.transport .btn.action-clear:hover,
.track-controls .btn.action-clear:hover {
  background: color-mix(in srgb, black 20%, var(--well-btn));
}

.btn:hover:not(:disabled) .icon-playhead,
a.btn:hover .icon-playhead {
  animation: icon-play 0.45s ease;
}

.btn:hover:not(:disabled) .icon-bar-l {
  animation: icon-pause 0.4s ease;
}

.btn:hover:not(:disabled) .icon-bar-r {
  animation: icon-pause 0.4s ease 0.1s;
}

.btn:hover:not(:disabled) .icon-tick {
  animation: icon-step 0.4s ease;
}

.btn:hover:not(:disabled) .icon-ball {
  animation: icon-launch 0.55s ease-out;
}

.btn:hover:not(:disabled) .icon-trail {
  animation: icon-trail 0.55s ease-out;
}

.btn:hover:not(:disabled) .icon-check {
  animation: icon-check 0.45s ease;
}

.btn:hover:not(:disabled) .icon-spin,
.icon-btn:hover:not(:disabled) .icon-spin {
  animation: icon-spin 0.55s ease;
}

.btn:hover:not(:disabled) .icon-dot {
  animation: icon-record 0.5s ease;
}

.btn:hover:not(:disabled) .icon-wipe {
  animation: icon-wipe 0.4s ease;
}

.btn:hover:not(:disabled) .icon-chevron {
  animation: icon-nudge 0.35s ease;
}

.btn.action-nudge-left:hover:not(:disabled) .icon-chevron,
.btn.action-prev:hover:not(:disabled) .icon-chevron {
  animation: icon-nudge-left 0.35s ease;
}

.btn:hover:not(:disabled) .icon-plus {
  animation: icon-plus 0.35s ease;
}

.btn:hover:not(:disabled) .icon-scrape {
  animation: icon-scrape 0.4s ease;
}

.btn:hover:not(:disabled) .icon-pupil {
  animation: icon-reveal 0.45s ease;
}

.btn:hover:not(:disabled) .icon-swap {
  animation: icon-shuffle 0.45s ease;
}

.btn:hover:not(:disabled) .icon-page {
  animation: icon-page 0.45s ease;
}

.btn:hover:not(:disabled) .icon-needle {
  animation: icon-needle 0.5s ease;
}

.btn:hover:not(:disabled) .icon-arrow,
a.btn:hover .icon-arrow {
  animation: icon-go 0.35s ease;
}

.icon-btn:hover:not(:disabled) .icon-expand {
  animation: icon-expand 0.45s ease;
}

.icon-btn:hover:not(:disabled) .icon-drop {
  animation: icon-drop 0.45s ease;
}

#tutorial-restart:hover .icon-spin {
  animation: icon-spin 0.55s ease;
}

.tutorial-close:hover .icon-x {
  animation: icon-close 0.35s ease;
}

@keyframes icon-play {
  0% { transform: translateX(0) scale(1); }
  55% { transform: translateX(2.5px) scale(1.08); }
  100% { transform: translateX(0) scale(1); }
}

@keyframes icon-pause {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(0.62); }
}

@keyframes icon-step {
  0% { transform: translateX(0); }
  50% { transform: translateX(3px); }
  100% { transform: translateX(0); }
}

@keyframes icon-launch {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(9px, -10px) scale(0.7); }
}

@keyframes icon-trail {
  0% { stroke-dasharray: 24; stroke-dashoffset: 24; }
  100% { stroke-dasharray: 24; stroke-dashoffset: 0; }
}

@keyframes icon-check {
  0% { stroke-dasharray: 24; stroke-dashoffset: 24; }
  100% { stroke-dasharray: 24; stroke-dashoffset: 0; }
}

@keyframes icon-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

@keyframes icon-record {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.35); opacity: 0.7; }
}

@keyframes icon-wipe {
  0% { transform: rotate(0deg); }
  40% { transform: rotate(-18deg); }
  100% { transform: rotate(0deg); }
}

@keyframes icon-nudge {
  0% { transform: translateX(0); }
  50% { transform: translateX(3px); }
  100% { transform: translateX(0); }
}

@keyframes icon-nudge-left {
  0% { transform: translateX(0); }
  50% { transform: translateX(-3px); }
  100% { transform: translateX(0); }
}

@keyframes icon-plus {
  0% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.2) rotate(90deg); }
  100% { transform: scale(1) rotate(90deg); }
}

@keyframes icon-scrape {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(2px); }
}

@keyframes icon-reveal {
  0%, 100% { transform: scale(1); }
  40% { transform: scale(0.15); }
  70% { transform: scale(1.15); }
}

@keyframes icon-shuffle {
  0% { transform: translateX(0); }
  50% { transform: translateX(2px) rotate(-8deg); }
  100% { transform: translateX(0); }
}

@keyframes icon-page {
  0% { transform: translateX(0); opacity: 1; }
  50% { transform: translateX(3px); opacity: 0.35; }
  100% { transform: translateX(0); opacity: 1; }
}

@keyframes icon-needle {
  0% { transform: rotate(0deg); }
  40% { transform: rotate(-28deg); }
  100% { transform: rotate(18deg); }
}

@keyframes icon-go {
  0% { transform: translateX(0); }
  50% { transform: translateX(3px); }
  100% { transform: translateX(0); }
}

@keyframes icon-expand {
  0% { transform: scale(1); }
  50% { transform: scale(1.16); }
  100% { transform: scale(1); }
}

@keyframes icon-drop {
  0% { transform: translateY(0); }
  50% { transform: translateY(3px); }
  100% { transform: translateY(0); }
}

@keyframes icon-close {
  0% { transform: rotate(0deg); }
  50% { transform: rotate(90deg) scale(1.08); }
  100% { transform: rotate(90deg); }
}

.btn-icon .icon-playhead,
.btn-icon .icon-bar-l,
.btn-icon .icon-bar-r,
.btn-icon .icon-tick,
.btn-icon .icon-ball,
.btn-icon .icon-spin,
.btn-icon .icon-dot,
.btn-icon .icon-wipe,
.btn-icon .icon-chevron,
.btn-icon .icon-plus,
.btn-icon .icon-scrape,
.btn-icon .icon-pupil,
.btn-icon .icon-swap,
.btn-icon .icon-page,
.btn-icon .icon-needle,
.btn-icon .icon-arrow,
.btn-icon .icon-expand,
.btn-icon .icon-drop,
.btn-icon .icon-x {
  transform-origin: center;
  transform-box: fill-box;
}

[data-theme="contrast"] .btn.primary,
[data-theme="contrast"] .btn.action-check,
[data-theme="contrast"] .transport .btn.action-play,
[data-theme="contrast"] .transport .btn.action-launch,
[data-theme="contrast"] .transport .btn.action-check {
  background-image: none;
  box-shadow: none;
}

@media (prefers-reduced-motion: reduce) {
  .btn:hover .btn-icon *,
  .icon-btn:hover .btn-icon *,
  a.btn:hover .btn-icon *,
  #tutorial-restart:hover .btn-icon *,
  .tutorial-close:hover .btn-icon * {
    animation: none !important;
  }
}