:root {
  color-scheme: light;
  --paper: #f5f2e9;
  --paper-deep: #ebe6d8;
  --ink: #17211d;
  --muted: #59635e;
  --forest: #0b5748;
  --forest-dark: #073e35;
  --teal: #187a74;
  --orange: #b65f2f;
  --blue: #345f73;
  --red: #bd573f;
  --green: #288466;
  --white: #fffdf7;
  --line: rgba(23, 33, 29, 0.17);
  font-family: "IBM Plex Sans", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-width: 0;
  background: transparent;
  color: var(--ink);
}

body {
  padding: 1px;
}

button,
input {
  font: inherit;
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid #f4a261;
  outline-offset: 3px;
}

.demo-shell {
  width: min(1440px, 100%);
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 26px;
  background:
    linear-gradient(rgba(11, 87, 72, 0.026) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 87, 72, 0.026) 1px, transparent 1px),
    var(--paper);
  background-size: 42px 42px;
  box-shadow: 0 18px 45px rgba(23, 33, 29, 0.09);
}

.demo-header,
.theorem-strip,
.laboratory,
.model {
  padding: clamp(1.4rem, 3.5vw, 3.5rem);
}

.demo-header {
  position: relative;
  overflow: hidden;
  background: var(--forest-dark);
  color: var(--white);
}

.demo-header::after {
  position: absolute;
  top: -105px;
  right: -75px;
  width: 360px;
  height: 360px;
  border: 1px solid rgba(255, 253, 247, 0.16);
  border-radius: 50%;
  box-shadow: 0 0 0 50px rgba(255, 253, 247, 0.028), 0 0 0 100px rgba(255, 253, 247, 0.02);
  content: "";
}

.kicker {
  margin: 0 0 0.75rem;
  color: var(--teal);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.demo-header .kicker {
  color: #9bd8ca;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
}

h1 {
  position: relative;
  z-index: 1;
  max-width: 940px;
  margin-bottom: 1rem;
  font-size: clamp(2.5rem, 6vw, 5.35rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.lede {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0;
  color: rgba(255, 253, 247, 0.77);
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  line-height: 1.72;
}

.theorem-strip {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.85fr);
  align-items: center;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 247, 0.82);
}

.theorem-strip h2,
.section-heading h2 {
  margin: 0;
  font-size: clamp(1.9rem, 3.4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.theorem-strip p:not(.kicker),
.section-heading > p:last-child {
  max-width: 770px;
  margin: 1rem 0 0;
  color: var(--muted);
  line-height: 1.68;
}

.inline-math {
  display: inline-block;
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  white-space: nowrap;
}

.theorem-equation {
  overflow-x: auto;
  padding: 1.3rem 1.4rem;
  border: 1px solid rgba(24, 122, 116, 0.3);
  border-radius: 17px;
  background: rgba(24, 122, 116, 0.075);
  text-align: center;
}

.theorem-equation strong {
  display: inline-block;
  color: var(--forest-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.2rem, 2.3vw, 1.75rem);
  font-weight: 500;
  white-space: nowrap;
}

.radicand {
  display: inline-block;
  padding: 0.08rem 0.08rem 0;
  border-top: 1px solid currentColor;
}

.laboratory {
  border-bottom: 1px solid var(--line);
}

.lab-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) minmax(0, 2.3fr);
  align-items: start;
  gap: 1rem;
  margin-top: 2rem;
}

.control-panel,
.visual-card,
.metric-grid > div,
.model-grid article {
  border: 1px solid var(--line);
  background: var(--white);
}

.control-panel {
  display: grid;
  gap: 1.15rem;
  padding: 1rem;
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(23, 33, 29, 0.06);
}

.control-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.control-heading > span {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.control-heading button {
  min-height: 36px;
  padding: 0.4rem 0.75rem;
  border: 1px solid rgba(23, 33, 29, 0.22);
  border-radius: 999px;
  background: transparent;
  color: var(--forest);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 700;
}

.range-control {
  display: grid;
  gap: 0.5rem;
}

.range-control > span {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.35rem;
}

.range-control b {
  font-size: 0.8rem;
}

.range-control output {
  color: var(--teal);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.74rem;
  font-weight: 700;
}

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

.range-control small,
.gain-shape small {
  color: var(--muted);
  font-size: 0.7rem;
}

.inspection {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.gain-shape {
  display: grid;
  margin: 0;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  gap: 0.45rem;
}

.gain-shape legend {
  padding: 0 0.25rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
}

.gain-shape label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.gain-shape label span {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  width: 100%;
  gap: 0.4rem;
}

.gain-shape input {
  accent-color: var(--teal);
}

.visuals {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.visual-card {
  min-width: 0;
  overflow: hidden;
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(23, 33, 29, 0.06);
}

.visual-card header {
  min-height: 104px;
  padding: 1rem 1rem 0.8rem;
  border-top: 4px solid var(--teal);
}

.plot-card header {
  border-top-color: var(--blue);
}

.visual-card header span,
.model-grid article > span,
.metric-grid span,
.status-card span {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.visual-card h3 {
  margin: 0.35rem 0 0;
  font-size: clamp(1.2rem, 1.7vw, 1.55rem);
  line-height: 1.1;
}

.visual-card canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1.3 / 1;
  background: #071c18;
}

.plot-card canvas {
  aspect-ratio: 1.35 / 1;
}

.canvas-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.8rem;
  min-height: 47px;
  padding: 0.7rem 0.9rem;
  background: #071c18;
  color: rgba(255, 253, 247, 0.78);
  font-size: 0.68rem;
}

.canvas-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.canvas-legend i {
  display: inline-block;
  width: 15px;
  height: 8px;
  border: 1px solid currentColor;
}

.ellipse-key {
  color: #86aab4;
  background: rgba(134, 170, 180, 0.28);
}

.capacity-key,
.capacity-line-key {
  color: #65c895;
}

.target-key,
.target-line-key {
  color: #f3ad64;
}

.cursor-key {
  width: 2px !important;
  background: #fffdf7;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.9rem;
}

.metric-grid > div {
  display: grid;
  min-height: 86px;
  padding: 0.85rem 0.9rem;
  border-radius: 12px;
}

.metric-grid strong {
  align-self: end;
  margin-top: 0.4rem;
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.02rem;
  font-weight: 500;
}

.status-card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem;
  margin-top: 0.9rem;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(189, 87, 63, 0.42);
  border-radius: 15px;
  background: rgba(189, 87, 63, 0.08);
}

.status-card.is-pass {
  border-color: rgba(40, 132, 102, 0.42);
  background: rgba(40, 132, 102, 0.085);
}

.status-icon {
  display: grid;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--red);
  color: var(--white);
  font-size: 1.3rem;
  font-weight: 800;
  place-items: center;
}

.is-pass .status-icon {
  background: var(--green);
}

.status-card strong {
  display: block;
  margin: 0.25rem 0 0.2rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 500;
}

.status-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.55;
}

.model {
  background: rgba(255, 253, 247, 0.65);
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.7rem;
}

.model-grid article {
  min-width: 0;
  padding: 1.1rem;
  border-top: 3px solid var(--teal);
  border-radius: 13px;
}

.model-grid article:nth-child(2) {
  border-top-color: var(--blue);
}

.model-grid article:nth-child(3) {
  border-top-color: var(--orange);
}

.model-grid strong {
  display: block;
  margin-top: 0.65rem;
  overflow-x: auto;
  color: var(--forest-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  font-weight: 500;
  white-space: nowrap;
}

.model-grid p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.62;
}

.necessary-note {
  margin: 1rem 0 0;
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--orange);
  background: rgba(182, 95, 47, 0.075);
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.6;
}

@media (max-width: 1050px) {
  .lab-layout {
    grid-template-columns: 1fr;
  }

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

  .control-heading,
  .inspection {
    grid-column: 1 / -1;
  }

  .inspection {
    padding-top: 0.8rem;
  }
}

@media (max-width: 780px) {
  .theorem-strip {
    grid-template-columns: 1fr;
  }

  .visuals,
  .model-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 560px) {
  body {
    padding: 0;
  }

  .demo-header,
  .theorem-strip,
  .laboratory,
  .model {
    padding: 1.1rem;
  }

  .demo-shell {
    border-right: 0;
    border-left: 0;
    border-radius: 0;
  }

  .control-panel {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .control-heading,
  .inspection {
    grid-column: auto;
  }

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

  .visual-card canvas,
  .plot-card canvas {
    height: 230px;
    aspect-ratio: auto;
  }

  .model-grid {
    grid-template-columns: repeat(3, minmax(265px, 1fr));
    overflow-x: auto;
    padding-bottom: 0.5rem;
    scroll-snap-type: x proximity;
  }

  .model-grid article {
    scroll-snap-align: start;
  }

  .model-grid p {
    font-size: 0.78rem;
    line-height: 1.52;
  }

  .status-card {
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}