:root {
  color-scheme: light;
  --ink: #17201d;
  --muted: #64706b;
  --paper: #f8f6ef;
  --panel: rgba(255, 252, 244, 0.9);
  --line: rgba(23, 32, 29, 0.14);
  --teal: #0f6f78;
  --green: #4d7f3a;
  --gold: #c49125;
  --rose: #b55f66;
  --blue: #2c5f93;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.cover-page {
  min-height: 100vh;
  background:
    radial-gradient(circle at 74% 42%, rgba(196, 145, 37, 0.16), transparent 28%),
    linear-gradient(135deg, #fbf8ee 0%, #eef5f2 52%, #f7efe8 100%);
}

.cover-hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(320px, 0.92fr) minmax(360px, 1.08fr);
  align-items: center;
  gap: clamp(28px, 5vw, 76px);
  padding: clamp(28px, 5vw, 72px);
}

.cover-copy {
  max-width: 650px;
}

.article-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 30px;
  min-height: 52px;
  padding: 0 24px;
  background: var(--ink);
  color: #fffaf0;
  text-decoration: none;
  font-weight: 850;
}

.article-link::after {
  content: "->";
  margin-left: 12px;
  font-weight: 600;
}

.cover-figure {
  margin: 0;
}

.cover-figure img {
  width: 100%;
  display: block;
  border: 1px solid rgba(23, 32, 29, 0.18);
  box-shadow: 0 28px 80px rgba(23, 32, 29, 0.16);
}

.cover-figure figcaption {
  max-width: 620px;
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  overflow-x: hidden;
}

.stage {
  position: relative;
  min-height: 94vh;
  overflow: visible;
  background:
    radial-gradient(circle at 78% 42%, rgba(196, 145, 37, 0.12), transparent 29%),
    linear-gradient(135deg, #fbf8ee 0%, #eef5f2 48%, #f7efe8 100%);
}

.stage::before {
  content: "";
  position: absolute;
  z-index: 1;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(248, 246, 239, 0.88) 0%, rgba(248, 246, 239, 0.54) 34%, rgba(248, 246, 239, 0.12) 58%, transparent 78%);
}

.visual-viewport {
  position: absolute;
  z-index: 2;
  top: clamp(132px, 17vh, 166px);
  right: clamp(20px, 4vw, 56px);
  bottom: clamp(84px, 10vh, 112px);
  width: min(680px, 47vw);
  min-height: 430px;
  border: 1px solid rgba(23, 32, 29, 0.2);
  background:
    radial-gradient(circle at 42% 36%, rgba(255, 255, 255, 0.74), transparent 34%),
    linear-gradient(145deg, rgba(255, 252, 244, 0.62), rgba(235, 243, 239, 0.72));
  box-shadow: 0 24px 70px rgba(23, 32, 29, 0.11);
  overflow: hidden;
}

.viewport-header {
  position: absolute;
  z-index: 3;
  top: 18px;
  left: 18px;
  right: 18px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  pointer-events: none;
  padding: 12px;
  margin: -12px;
  background: linear-gradient(180deg, rgba(255, 252, 244, 0.82), rgba(255, 252, 244, 0));
}

.viewport-header .eyebrow {
  margin-bottom: 4px;
}

.viewport-header h2 {
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 1.35rem;
  line-height: 1.1;
  font-weight: 850;
}

.viewport-pill {
  border: 1px solid rgba(23, 32, 29, 0.18);
  padding: 7px 10px;
  background: rgba(255, 252, 244, 0.7);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.viewport-caption {
  position: absolute;
  z-index: 3;
  left: 18px;
  right: 18px;
  bottom: 14px;
  margin: 0;
  max-width: 540px;
  color: #40504b;
  font-size: 0.92rem;
  line-height: 1.45;
  pointer-events: none;
  padding: 22px 0 2px;
  background: linear-gradient(0deg, rgba(255, 252, 244, 0.88), rgba(255, 252, 244, 0));
}

#helixCanvas {
  width: 100%;
  height: 100%;
  display: block;
  filter: saturate(1.03) contrast(1.02);
}

.topbar {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(360px, 0.82fr) minmax(300px, 0.48fr);
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: clamp(26px, 4vw, 52px);
  pointer-events: none;
}

.hero-copy {
  max-width: 590px;
}

.topbar nav,
.mode-tabs,
.mode-tab {
  pointer-events: auto;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  max-width: 760px;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2rem, 4.8vw, 4.25rem);
  max-width: 560px;
}

.dek {
  max-width: 510px;
  margin: 18px 0 0;
  color: #40504b;
  font-size: clamp(1rem, 1.55vw, 1.22rem);
  line-height: 1.5;
}

.byline {
  margin: 12px 0 0;
  color: #65746f;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(1.9rem, 4vw, 3.6rem);
}

.mode-tabs {
  justify-self: end;
  display: flex;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.54);
  backdrop-filter: blur(12px);
}

.mode-tab {
  min-width: 86px;
  border: 0;
  padding: 10px 14px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.mode-tab.active {
  background: var(--ink);
  color: #fffaf0;
}

.readout {
  position: static;
  width: min(360px, calc(100vw - 36px));
  padding: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.78);
  backdrop-filter: blur(14px);
}

.hero-instrument {
  position: absolute;
  z-index: 2;
  left: clamp(18px, 4vw, 52px);
  bottom: clamp(30px, 5vh, 48px);
  display: grid;
  gap: 12px;
  width: min(560px, calc(52vw - 52px));
}

.readout-primary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.readout-label,
.control-strip label,
.muted,
.matrix-title {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.readout-number {
  font-size: 3.1rem;
  font-weight: 800;
  color: var(--teal);
  line-height: 1;
}

.readout-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 16px;
  padding-top: 14px;
  color: var(--muted);
}

.readout-grid strong {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.control-strip {
  position: static;
  z-index: 2;
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(120px, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.78);
  backdrop-filter: blur(14px);
}

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

.control-values {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.explain-band {
  padding: clamp(42px, 7vw, 96px) clamp(18px, 4vw, 52px);
  border-top: 1px solid var(--line);
  background: #fbfaf5;
}

.article-section,
.still-section {
  padding: clamp(42px, 7vw, 92px) clamp(18px, 4vw, 52px);
  border-top: 1px solid var(--line);
  background: #fbfaf5;
}

.article-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) minmax(360px, 1.3fr);
  gap: clamp(24px, 6vw, 84px);
  max-width: 1120px;
  margin: 0 auto;
}

.article-copy,
.reference-list {
  color: #344641;
  font-size: clamp(1.05rem, 1.45vw, 1.22rem);
  line-height: 1.68;
}

.article-copy p,
.reference-list p {
  margin: 0 0 1.1em;
}

.article-copy p:last-child,
.reference-list p:last-child {
  margin-bottom: 0;
}

.reference-list a {
  color: var(--teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.term-sheet {
  margin: 22px 0;
  padding: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.74);
}

.term-sheet summary {
  cursor: pointer;
  list-style-position: inside;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.2;
}

.term-sheet[open] {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 10px 16px;
}

.term-sheet[open] summary {
  grid-column: 1 / -1;
  margin: 0 0 2px;
}

.term-sheet p {
  margin: 0;
  color: #40504b;
  font-size: 0.92rem;
  line-height: 1.42;
}

.term-sheet strong {
  color: var(--ink);
}

.muted-inline {
  color: var(--muted);
  font-size: 0.9em;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.method-card {
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.72);
  padding: 18px;
}

.method-card h3,
.ladder-step h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.15;
}

.method-card p,
.ladder-step p {
  margin: 0;
  color: #40504b;
  font-size: 0.98rem;
  line-height: 1.45;
}

.baseline-table {
  display: grid;
  margin: 24px 0 10px;
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.72);
  font-size: 0.92rem;
  line-height: 1.35;
}

.baseline-table > div {
  display: grid;
  grid-template-columns: 0.78fr 1.02fr 1.28fr;
  border-top: 1px solid var(--line);
}

.baseline-table > div:first-child {
  border-top: 0;
  background: rgba(15, 111, 120, 0.08);
  color: var(--ink);
  font-weight: 850;
}

.baseline-table span {
  padding: 11px 12px;
  border-left: 1px solid var(--line);
}

.baseline-table span:first-child {
  border-left: 0;
  font-weight: 800;
  color: var(--ink);
}

.ladder {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.ladder-step {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: start;
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.72);
  padding: 14px;
}

.ladder-step > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: rgba(23, 32, 29, 0.08);
  color: var(--muted);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.ladder-step.active {
  border-color: rgba(15, 111, 120, 0.38);
  background: rgba(232, 244, 240, 0.78);
}

.ladder-step.active > span {
  background: var(--teal);
  color: #fffaf0;
}

.still-section {
  background: #ecebe3;
}

.still-frame {
  max-width: 1120px;
  margin: 0 auto;
}

.still-frame img {
  display: block;
  width: 100%;
  border: 1px solid rgba(23, 32, 29, 0.18);
  box-shadow: 0 22px 60px rgba(23, 32, 29, 0.16);
}

.still-frame figcaption {
  max-width: 760px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.token-band {
  background: #f1f5f0;
}

.toolbox-band {
  background: #eef5f2;
}

.resolution-band {
  background: #fbf7ed;
}

.section-heading {
  max-width: 1060px;
  margin: 0 auto 30px;
}

.section-dek {
  max-width: 780px;
  margin: 16px 0 0;
  color: #40504b;
  font-size: clamp(1rem, 1.45vw, 1.16rem);
  line-height: 1.55;
}

.article-bridge {
  max-width: 1180px;
  margin: 0 auto 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  gap: 14px;
}

.article-bridge p {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 18px;
  color: #40504b;
  font-size: 1rem;
  line-height: 1.55;
}

.residual-layout,
.token-layout,
.resolution-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 1.3fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.resolution-layout {
  grid-template-columns: minmax(300px, 0.95fr) minmax(320px, 1fr) minmax(320px, 1fr);
  align-items: stretch;
}

.matrix-panel,
.math-work,
.model-work {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(18px, 3vw, 28px);
}

.matrix-panel.wide {
  min-width: 0;
}

.vector-bars {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 8px;
  align-items: end;
  height: 230px;
  margin: 24px 0;
  padding-top: 20px;
  border-bottom: 1px solid var(--line);
}

.bar {
  min-height: 3px;
  background: linear-gradient(180deg, var(--teal), var(--green));
  transform-origin: bottom center;
  transition: height 280ms ease, background 280ms ease;
}

.token-row,
.emission-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.token,
.digit-row span,
.emission-token {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: #fffaf0;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.token.active,
.emission-token.active {
  background: var(--ink);
  color: #fffaf0;
}

.matrix-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}

.mini-matrix {
  display: grid;
  grid-template-columns: repeat(5, minmax(18px, 1fr));
  gap: 5px;
}

.cell {
  aspect-ratio: 1;
  background: rgba(15, 111, 120, 0.18);
  transition: background 280ms ease;
}

.accent .cell {
  background: rgba(196, 145, 37, 0.24);
}

.result .cell {
  background: rgba(77, 127, 58, 0.24);
}

.flow-arrow {
  color: var(--muted);
  font-size: 1.8rem;
  font-weight: 300;
}

.panel-copy {
  max-width: 760px;
  margin: 24px 0 0;
  color: #40504b;
  font-size: 1.02rem;
  line-height: 1.55;
}

.lead-copy {
  margin: 0;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  line-height: 1.22;
}

.caption-line {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.digit-chart {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  align-items: end;
  gap: 10px;
  height: 280px;
  margin-top: 20px;
  padding: 18px 0 30px;
  border-bottom: 1px solid var(--line);
}

.digit-chart::before {
  content: "50%";
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(30px + 50%);
  border-top: 1px dashed rgba(181, 95, 102, 0.7);
  color: var(--rose);
  font-size: 0.78rem;
  font-weight: 800;
  transform: translateY(50%);
}

.digit-bar {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: var(--h);
  min-height: 8px;
  background: linear-gradient(180deg, #0f6f78, #4d7f3a);
}

.digit-bar.warn {
  background: linear-gradient(180deg, #c49125, #b9821c);
}

.digit-bar.fail {
  background: linear-gradient(180deg, #b55f66, #8e3f49);
}

.digit-bar strong {
  position: absolute;
  top: -24px;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.digit-bar span {
  position: absolute;
  bottom: -26px;
  color: var(--muted);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.angle-chart {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.angle-row {
  display: grid;
  grid-template-columns: 58px 1fr auto;
  align-items: center;
  gap: 12px;
}

.angle-row span,
.angle-row strong {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.angle-row div {
  position: relative;
  height: 28px;
  border: 1px solid var(--line);
  background: rgba(23, 32, 29, 0.05);
}

.angle-row i,
.angle-row b {
  position: absolute;
  left: 0;
  height: 9px;
}

.angle-row i {
  top: 4px;
  background: var(--teal);
}

.angle-row b {
  bottom: 4px;
  background: var(--gold);
}

.legend-row {
  display: flex;
  gap: 18px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
}

.legend-row i,
.legend-row b {
  display: inline-block;
  width: 22px;
  height: 8px;
  margin-right: 7px;
  vertical-align: 1px;
}

.legend-row i {
  background: var(--teal);
}

.legend-row b {
  background: var(--gold);
}

.toolbox-layout {
  display: grid;
  grid-template-columns: 170px minmax(360px, 1fr) minmax(280px, 0.72fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.toolbox-controls,
.toolbox-visual,
.toolbox-explain {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 18px;
}

.toolbox-controls {
  display: grid;
  gap: 8px;
  align-content: start;
}

.tool-button {
  min-height: 44px;
  border: 1px solid var(--line);
  background: #fffaf0;
  color: var(--muted);
  cursor: pointer;
  font-weight: 850;
  text-align: left;
  padding: 0 12px;
}

.tool-button.active {
  background: var(--ink);
  color: #fffaf0;
}

.activation-board {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(220px, 1fr);
  align-items: center;
  gap: 18px;
  min-height: 290px;
}

.tool-vector {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 7px;
  align-items: end;
  height: 210px;
  margin-top: 18px;
  border-bottom: 1px solid var(--line);
}

.tool-dim {
  position: relative;
  min-height: 4px;
  background: linear-gradient(180deg, var(--teal), var(--green));
  transition: height 260ms ease, background 260ms ease, opacity 260ms ease;
}

.tool-dim.negative {
  background: linear-gradient(180deg, var(--rose), var(--gold));
}

.tool-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.8);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tool-output {
  min-height: 210px;
  margin-top: 18px;
  display: grid;
  gap: 10px;
  align-content: center;
}

.score-gauge {
  height: 16px;
  background: rgba(23, 32, 29, 0.1);
  overflow: hidden;
}

.score-gauge > i {
  display: block;
  width: var(--score);
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--gold));
}

.feature-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-pill {
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: #fffaf0;
  font-weight: 850;
  font-size: 0.86rem;
}

.feature-pill.active {
  background: var(--teal);
  color: #fffaf0;
}

.patch-pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: center;
}

.mini-vector {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  align-items: end;
  height: 86px;
  border-bottom: 1px solid var(--line);
}

.mini-vector span {
  display: block;
  min-height: 4px;
  background: var(--teal);
}

.sae-stack {
  display: grid;
  gap: 12px;
}

.sparse-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}

.sparse-feature {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: rgba(23, 32, 29, 0.06);
  color: var(--muted);
  font-weight: 900;
}

.sparse-feature.active {
  background: var(--teal);
  color: #fffaf0;
}

.reconstruct-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: center;
}

.steer-plane {
  position: relative;
  height: 190px;
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(23, 32, 29, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 29, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
}

.steer-dot,
.steer-dot.after {
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  transform: translate(-50%, -50%);
  background: var(--teal);
}

.steer-dot.after {
  background: var(--rose);
}

.steer-line {
  position: absolute;
  height: 3px;
  transform-origin: left center;
  background: var(--gold);
}

.toolbox-explain h3 {
  margin: 0 0 12px;
  font-size: 1.35rem;
}

.toolbox-explain p {
  margin: 0;
  color: #40504b;
  font-size: 1rem;
  line-height: 1.55;
}

.sim-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto 18px;
}

.sim-controls label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 12px;
  align-items: center;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 14px;
}

.sim-controls span,
.sim-controls strong {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.sim-controls strong {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.sim-controls input {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--teal);
}

.tool-static-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 14px;
  max-width: 1180px;
  margin: 0 auto;
}

.tool-static-card {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 18px;
  min-height: 330px;
  display: flex;
  flex-direction: column;
}

.tool-static-card p {
  margin: 16px 0 0;
  color: #40504b;
  font-size: 0.96rem;
  line-height: 1.48;
}

.tool-static-card .tool-example {
  min-height: 76px;
  margin-top: 12px;
  color: #263934;
  font-size: 0.9rem;
  line-height: 1.45;
}

.tool-static-card .proof-note {
  margin-top: auto;
  padding-top: 14px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.42;
}

.tool-static-card .proof-note strong {
  color: var(--ink);
}

.tool-mini-scene {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: center;
  min-height: 164px;
  margin-top: 12px;
}

.tool-mini-scene.sae-mini {
  grid-template-columns: 0.82fr auto 1.18fr;
}

.static-vector {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  align-items: end;
  height: 130px;
  border-bottom: 1px solid var(--line);
}

.static-vector span {
  display: block;
  min-height: 5px;
  background: linear-gradient(180deg, var(--teal), var(--green));
}

.static-vector span.neg {
  background: linear-gradient(180deg, var(--rose), var(--gold));
}

.static-vector.donor span {
  background: var(--gold);
}

.static-vector.recipient span {
  background: var(--blue);
}

.static-output {
  display: grid;
  gap: 12px;
  align-content: center;
}

.static-output strong {
  color: var(--teal);
  line-height: 1.25;
}

.labeled-mini {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.full-mini {
  grid-column: 1 / -1;
}

.mini-label {
  display: block;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-transform: uppercase;
}

.steer-plane.compact {
  grid-column: 1 / -1;
  height: 164px;
}

.scope-note {
  margin: 20px 0;
  padding: 15px 18px;
  border-left: 4px solid var(--gold);
  background: rgba(255, 252, 244, 0.78);
  color: #344641;
  font-size: 1rem;
  line-height: 1.55;
}

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

.prompt-examples {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 14px;
  margin: 18px 0 0;
}

.prompt-examples > div {
  border: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.74);
  padding: 16px;
}

.prompt-examples h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.2;
}

.prompt-examples p {
  margin: 0 0 10px;
  color: #40504b;
  font-size: 0.9rem;
  line-height: 1.42;
}

.prompt-examples p:last-child {
  margin-bottom: 0;
}

.problem-line {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 5vw, 4.3rem);
  line-height: 1.1;
  margin-bottom: 32px;
}

.human-work {
  display: grid;
  gap: 12px;
}

.digit-row {
  display: flex;
  gap: 8px;
}

.digit-row.reverse span {
  background: #f7ede7;
  border-color: rgba(181, 95, 102, 0.38);
}

.carry-line {
  color: var(--rose);
  font-weight: 750;
}

.model-work {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.emission-token {
  min-width: 72px;
  height: 54px;
  font-size: 1.35rem;
}

.next-token-meter {
  width: 100%;
  height: 10px;
  margin-top: 22px;
  background: rgba(23, 32, 29, 0.12);
  overflow: hidden;
}

#nextTokenFill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--gold));
  transition: width 500ms ease;
}

.token-explainer {
  max-width: 1180px;
  margin: 18px auto 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(260px, 1fr));
  gap: 18px;
}

.token-explainer p {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 18px;
  color: #40504b;
  font-size: 1rem;
  line-height: 1.58;
}

.crowding-visual {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.crowding-visual p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.48;
}

.crowd-disc {
  position: relative;
  aspect-ratio: 1;
  min-height: 150px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background:
    radial-gradient(circle at center, rgba(255, 252, 244, 0.78) 0 18%, transparent 19%),
    conic-gradient(from 0deg, rgba(15, 111, 120, 0.08), rgba(196, 145, 37, 0.14), rgba(181, 95, 102, 0.1), rgba(15, 111, 120, 0.08));
  overflow: visible;
}

.crowd-disc::before {
  content: "12-digit: separated";
  position: absolute;
  left: 12px;
  top: 10px;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.crowd-disc.crowded::before {
  content: "14-digit: crowded";
}

.crowd-ray {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 38%;
  height: 2px;
  transform-origin: left center;
  transform: rotate(var(--a));
}

.crowd-ray::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: var(--teal);
}

.crowd-disc b {
  position: absolute;
  width: 24px;
  height: 24px;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(23, 32, 29, 0.16);
  border-radius: 999px;
  background: #fffaf0;
  color: var(--ink);
  font-size: 0.68rem;
  font-weight: 900;
  line-height: 1;
  box-shadow: 0 2px 8px rgba(23, 32, 29, 0.08);
}

.crowd-disc.crowded .crowd-ray::before {
  background: var(--rose);
  box-shadow: 0 0 12px rgba(181, 95, 102, 0.18);
}

@media (max-width: 820px) {
  .cover-hero {
    grid-template-columns: 1fr;
    align-content: center;
  }

  .stage {
    min-height: 128vh;
  }

  .stage::before {
    background: linear-gradient(180deg, rgba(248, 246, 239, 0.96) 0%, rgba(248, 246, 239, 0.82) 42%, rgba(248, 246, 239, 0.08) 72%, transparent 100%);
  }

  .visual-viewport {
    top: 360px;
    left: 18px;
    right: 18px;
    bottom: 230px;
    width: auto;
    min-height: 280px;
  }

  .hero-instrument {
    left: 18px;
    right: 18px;
    bottom: 24px;
    width: auto;
  }

  .topbar,
  .residual-layout,
  .token-layout,
  .resolution-layout,
  .article-grid,
  .toolbox-layout {
    grid-template-columns: 1fr;
  }

  .activation-board {
    grid-template-columns: 1fr;
  }

  .tool-arrow {
    transform: rotate(90deg);
    justify-self: center;
  }

  .topbar {
    display: grid;
  }

  .mode-tabs {
    width: 100%;
    overflow-x: auto;
  }

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

  .method-grid {
    grid-template-columns: 1fr;
  }

  .term-sheet {
    grid-template-columns: 1fr;
  }

  .baseline-table,
  .baseline-table > div {
    display: block;
  }

  .baseline-table > div {
    padding: 10px 12px;
  }

  .baseline-table span {
    display: block;
    padding: 3px 0;
    border-left: 0;
  }

  .tool-static-grid {
    grid-template-columns: 1fr;
  }

  .sim-controls,
  .token-explainer,
  .crowding-visual,
  .prompt-examples,
  .article-bridge {
    grid-template-columns: 1fr;
  }

  .tool-mini-scene {
    grid-template-columns: 1fr;
  }

  .matrix-flow {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    transform: rotate(90deg);
    justify-self: center;
  }
}