:root {
  color-scheme: light;
  --ink: #17201c;
  --muted: #5c6a62;
  --line: #d7ddd7;
  --paper: #fbfcf8;
  --band: #eef5ee;
  --panel: #ffffff;
  --teal: #177e89;
  --coral: #d45b49;
  --amber: #d89a27;
  --green: #4f8c4b;
  --violet: #7357a4;
  --shadow: 0 18px 40px rgba(31, 45, 37, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

#quarto-content,
#quarto-document-content,
main.content {
  display: block;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
}

#title-block-header,
.quarto-title-block {
  display: none;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
  padding: 0 32px;
  background: rgba(251, 252, 248, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 780;
  text-decoration: none;
}

.brand-mark {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 36%, #ffffff 0 16%, transparent 17%),
    conic-gradient(from 25deg, var(--teal), var(--amber), var(--coral), var(--teal));
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.12);
}

nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav a {
  padding: 8px 10px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 650;
}

nav a:hover {
  color: var(--ink);
}

main {
  overflow: hidden;
}

.sim-stage {
  min-height: calc(100vh - 64px);
  padding: 42px 32px 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(238, 245, 238, 0.7)),
    radial-gradient(circle at 82% 18%, rgba(216, 154, 39, 0.18), transparent 26%),
    radial-gradient(circle at 8% 38%, rgba(23, 126, 137, 0.12), transparent 30%);
}

.stage-copy {
  max-width: 1180px;
  margin: 0 auto 26px;
  display: grid;
  grid-template-columns: minmax(0, 760px);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 86px);
  line-height: 0.96;
  letter-spacing: 0;
  max-width: 930px;
}

.lede {
  max-width: 720px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.stage-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 18px;
  align-items: stretch;
}

.visual-shell {
  position: relative;
  min-height: 520px;
  border: 1px solid var(--line);
  background: #f8fbf6;
  overflow: hidden;
  box-shadow: var(--shadow);
}

#particle-canvas,
#geometry-canvas,
#path-canvas {
  display: block;
  width: 100%;
}

#particle-canvas {
  height: 100%;
  min-height: 520px;
}

.canvas-hud {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  pointer-events: none;
}

.canvas-hud span {
  padding: 7px 10px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(215, 221, 215, 0.9);
  color: var(--ink);
  font-size: 12px;
  font-weight: 720;
}

.control-panel,
.tool-panel,
.equation-panel,
.cycle-panel {
  background: var(--panel);
  border: 1px solid var(--line);
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  overflow: hidden;
}

.segment,
.case-button,
.icon-button {
  appearance: none;
  border: 0;
  background: #f3f6f1;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 740;
}

.segment {
  padding: 11px 12px;
}

.segment + .segment {
  border-left: 1px solid var(--line);
}

.segment.is-active,
.case-button.is-active {
  background: var(--teal);
  color: #fff;
}

.control-row {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 680;
}

.control-row strong {
  float: right;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

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

.toggle-line {
  display: grid;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.toggle-line input {
  accent-color: var(--teal);
}

.button-row {
  display: flex;
  gap: 10px;
}

.icon-button {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  display: inline-grid;
  place-items: center;
  font-size: 20px;
}

.icon-button:hover,
.case-button:hover,
.segment:hover {
  filter: brightness(0.97);
}

.metric-strip {
  max-width: 1180px;
  margin: 18px auto 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metric-strip div {
  padding: 16px;
  background: #fff;
  border: 1px solid var(--line);
}

.metric-label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 720;
  margin-bottom: 6px;
}

.metric-strip strong {
  font-size: 26px;
  font-variant-numeric: tabular-nums;
}

.full-band,
.proof-section,
.originality-section {
  padding: 72px 32px;
}

.full-band {
  background: var(--paper);
}

.proof-section {
  background: #f4f0ea;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.originality-section {
  background: #eef5ee;
}

.section-head {
  max-width: 1180px;
  margin: 0 auto 26px;
}

h2 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.05;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

.lab-grid,
.stats-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 18px;
}

.tool-panel {
  padding: 20px;
  min-height: 390px;
}

.tool-panel p,
.equation-panel p,
.cycle-panel p {
  color: var(--muted);
  line-height: 1.65;
}

#geometry-canvas,
#path-canvas {
  height: 300px;
  background: #f7faf6;
  border: 1px solid var(--line);
}

.plot {
  min-height: 300px;
  border: 1px solid var(--line);
  background: #f7faf6;
}

.proof-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 0.95fr);
  gap: 18px;
}

.equation-panel,
.cycle-panel {
  padding: 20px;
  min-height: 320px;
}

pre {
  margin: 12px 0;
  padding: 14px;
  overflow-x: auto;
  background: #17201c;
  color: #e8f2e8;
  font-size: 13px;
  line-height: 1.5;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

#cycle-diagram {
  width: 100%;
  height: auto;
  display: block;
}

.stat-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.case-button {
  padding: 10px 12px;
  border: 1px solid var(--line);
}

.originality-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.originality-grid > div {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
}

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

.plain-list li {
  position: relative;
  padding-left: 28px;
  line-height: 1.55;
}

.plain-list li::before {
  position: absolute;
  left: 0;
  top: 0;
  font-weight: 900;
}

.plain-list.negative li::before {
  content: "!";
  color: var(--coral);
}

.plain-list.positive li::before {
  content: "✓";
  color: var(--green);
}

.reference-strip {
  max-width: 1180px;
  margin: 18px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.reference-strip a {
  padding: 10px 12px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--teal);
  text-decoration: none;
  font-size: 14px;
  font-weight: 720;
}

footer {
  padding: 28px 32px;
  color: var(--muted);
  background: #17201c;
}

footer p {
  max-width: 1180px;
  margin: 0 auto;
  line-height: 1.6;
}

@media (max-width: 940px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 18px;
  }

  nav {
    justify-content: flex-start;
  }

  .sim-stage,
  .full-band,
  .proof-section,
  .originality-section {
    padding-left: 18px;
    padding-right: 18px;
  }

  .stage-grid,
  .lab-grid,
  .stats-grid,
  .proof-grid,
  .originality-grid {
    grid-template-columns: 1fr;
  }

  .metric-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .visual-shell,
  #particle-canvas {
    min-height: 420px;
  }
}

@media (max-width: 560px) {
  h1 {
    font-size: 38px;
  }

  .metric-strip {
    grid-template-columns: 1fr;
  }

  .canvas-hud {
    position: static;
    padding: 10px;
    background: #f8fbf6;
  }

  .visual-shell,
  #particle-canvas {
    min-height: 360px;
  }
}