.applet-body::before {
  background: radial-gradient(circle at 52% 18%, rgba(255, 255, 255, 0.78), transparent 35rem);
}

.applet-page {
  width: min(1280px, calc(100% - 56px));
  margin: 0 auto;
  padding: 36px 0 72px;
}

.applet-topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 58px;
}

.applet-back-link,
.applet-index-link {
  color: var(--ink);
  font-size: 19px;
  line-height: 1.2;
  text-decoration-color: var(--blue);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.applet-hero {
  max-width: 820px;
  margin: 0 0 48px;
}

.applet-kicker {
  margin: 0 0 12px;
  color: var(--blue);
  font-family: var(--hand);
  font-size: 19px;
  line-height: 1.1;
  rotate: -1.5deg;
}

.applet-hero h1 {
  margin: 0;
  font-size: clamp(48px, 7vw, 84px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: 0;
}

.applet-subtitle {
  max-width: 720px;
  margin: 22px 0 0;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.05;
}

.applet-stage {
  position: relative;
  min-height: 560px;
  overflow: hidden;
  border: 3px solid var(--ink);
  border-radius: 8px 5px 7px 4px;
  background: #fff;
}

.applet-stage #diagonal-canvas {
  min-height: 560px;
}

.applet-note {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--soft);
  font-size: 21px;
  line-height: 1.25;
}

.applet-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-top: 32px;
}

.applet-card {
  display: flex;
  min-height: 300px;
  flex-direction: column;
  padding: 22px 22px 18px;
  color: inherit;
  text-decoration: none;
  border: 3px solid var(--ink);
  border-radius: 6px 4px 8px 5px;
  background: rgba(255, 255, 255, 0.36);
  transition: transform 160ms ease, background-color 160ms ease;
}

.applet-card:hover {
  background: rgba(255, 255, 255, 0.72);
  color: var(--blue);
}

.applet-card h2 {
  margin: 0 0 10px;
  font-size: 34px;
  font-weight: 400;
  line-height: 1;
}

.applet-card p {
  margin: 0;
  color: var(--soft);
  font-size: 23px;
  line-height: 1.1;
}

.applet-card-meta {
  margin-top: auto;
  color: var(--blue);
  font-family: var(--hand);
  font-size: 21px;
  line-height: 1;
  rotate: -2deg;
}

.applet-card-preview {
  display: grid;
  min-height: 132px;
  place-items: center;
  margin-bottom: 18px;
  border: 2px solid rgba(18, 18, 18, 0.74);
  background:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    rgba(255, 255, 255, 0.42);
  background-size: 18px 18px;
}

.applet-card-preview svg {
  width: min(86%, 260px);
  height: 112px;
  fill: none;
  stroke: var(--ink);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 3;
}

.applet-placeholder-card {
  border-style: dashed;
}

.applet-credit {
  max-width: 820px;
  margin: -24px 0 42px;
  color: var(--soft);
  font-size: 20px;
  line-height: 1.25;
}

.applet-credit a {
  color: var(--blue);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.function-tool {
  display: grid;
  grid-template-columns: minmax(260px, 330px) minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.function-controls {
  display: grid;
  gap: 18px;
  padding: 20px;
  border: 3px solid var(--ink);
  border-radius: 6px 4px 8px 5px;
  background: rgba(255, 255, 255, 0.52);
}

.control-group {
  display: grid;
  gap: 8px;
}

.control-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.function-controls label,
.function-controls legend {
  color: var(--blue);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.1;
}

.function-controls input,
.function-controls select,
.function-controls button {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  color: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 5px 3px 6px 4px;
  background: #fff;
  font: inherit;
  font-size: 17px;
}

.function-controls button {
  cursor: pointer;
}

.function-controls button[aria-pressed="true"],
.function-controls button:hover {
  color: #fff;
  background: var(--blue);
}

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

.button-row button {
  flex: 1;
}

.toggle-line {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--ink);
  font-size: 18px;
}

.toggle-line input {
  width: 22px;
  min-height: 22px;
}

.readout {
  display: grid;
  gap: 4px;
  padding: 14px;
  border: 2px dashed rgba(18, 18, 18, 0.45);
  background: rgba(255, 255, 255, 0.58);
  font-size: 21px;
  line-height: 1.15;
}

.warning {
  min-height: 1.2em;
  color: #b12c00;
  font-size: 16px;
  line-height: 1.2;
}

.function-stage {
  position: relative;
  min-height: 650px;
  overflow: hidden;
  user-select: none;
  border: 3px solid var(--ink);
  border-radius: 8px 5px 7px 4px;
  background: #fff;
  -webkit-user-select: none;
}

.function-stage svg {
  display: block;
  width: 100%;
  height: 650px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.axis-line,
.tube-circle {
  stroke: var(--ink);
  stroke-width: 3;
}

.axis-tick {
  stroke: rgba(18, 18, 18, 0.7);
  stroke-width: 2;
}

.axis-label,
.tick-label,
.point-label {
  fill: var(--ink);
  font-family: var(--font);
  user-select: none;
  -webkit-user-select: none;
}

.axis-label {
  font-size: 20px;
  font-weight: 700;
}

.tick-label {
  font-size: 15px;
}

.mapping-segment {
  stroke: var(--blue);
  stroke-linecap: round;
  stroke-width: 2.2;
}

.mapping-segment.dim {
  opacity: 0.2;
}

.mapping-segment.depth-0 {
  stroke: #0b54b9;
}

.mapping-segment.depth-1 {
  stroke: #ff7f00;
}

.mapping-segment.depth-2 {
  stroke: #c02a9a;
}

.mapping-segment.depth-3 {
  stroke: #1f7a32;
}

.mapping-segment.depth-4 {
  stroke: #7a62b5;
}

.highlight-line {
  stroke: #d01818;
  stroke-linecap: round;
  stroke-width: 4;
}

.drag-point {
  cursor: grab;
  fill: #d01818;
  stroke: #d01818;
  stroke-width: 8;
}

.drag-point:active {
  cursor: grabbing;
}

.catenary-prompt {
  max-width: 980px;
  margin: -18px 0 28px;
  padding: 18px 20px;
  border-left: 4px solid rgba(18, 18, 18, 0.24);
  background: rgba(255, 255, 255, 0.46);
}

.catenary-prompt-meta {
  margin: 0 0 8px;
  color: var(--blue);
  font-family: var(--hand);
  font-size: 19px;
  line-height: 1.1;
}

.catenary-prompt blockquote {
  margin: 0;
  color: var(--ink);
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.18;
}

.catenary-tool {
  display: grid;
  gap: 16px;
}

.catenary-controls {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto auto auto;
  gap: 12px;
  align-items: end;
  padding: 16px;
  border: 3px solid var(--ink);
  border-radius: 6px 4px 8px 5px;
  background: rgba(255, 255, 255, 0.52);
}

.catenary-controls label {
  color: var(--blue);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.1;
}

.catenary-length-control label {
  display: flex;
  gap: 14px;
  align-items: baseline;
  justify-content: space-between;
}

.catenary-length-control output {
  color: var(--ink);
  font-size: 21px;
  font-weight: 400;
}

.catenary-controls input,
.catenary-controls button {
  min-height: 42px;
  color: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 5px 3px 6px 4px;
  background: #fff;
  font: inherit;
  font-size: 17px;
}

.catenary-controls input[type="range"] {
  width: 100%;
  min-height: 28px;
  padding: 0;
  accent-color: var(--blue);
  border: 0;
  border-radius: 0;
  background: transparent;
}

.catenary-controls input[type="checkbox"] {
  width: 22px;
  min-height: 22px;
  accent-color: var(--blue);
  border: 0;
}

.catenary-controls button {
  min-width: 112px;
  padding: 8px 10px;
  cursor: pointer;
}

.catenary-controls button:hover {
  color: #fff;
  background: var(--blue);
}

.catenary-trace-toggle {
  min-height: 42px;
  padding: 8px 10px;
  border: 2px solid var(--ink);
  border-radius: 5px 3px 6px 4px;
  background: #fff;
}

.catenary-stage {
  position: relative;
  min-height: 640px;
  margin: 0;
  overflow: hidden;
  user-select: none;
  border: 3px solid var(--ink);
  border-radius: 8px 5px 7px 4px;
  background: #fff;
  -webkit-user-select: none;
}

.catenary-stage canvas {
  display: block;
  width: 100%;
  height: 640px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

@media (max-width: 980px) {
  .function-tool {
    grid-template-columns: 1fr;
  }

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

  .readout,
  .warning {
    grid-column: 1 / -1;
  }

  .catenary-controls {
    grid-template-columns: minmax(220px, 1fr) minmax(130px, auto) auto auto;
  }
}

@media (max-width: 760px) {
  .applet-page {
    width: min(calc(100vw - 24px), 720px);
    padding-top: 22px;
  }

  .applet-topbar {
    margin-bottom: 42px;
  }

  .applet-hero h1 {
    max-width: 340px;
    font-size: 42px;
  }

  .applet-subtitle {
    width: 340px;
    max-width: calc(100vw - 48px);
    font-size: 22px;
  }

  .applet-gallery {
    grid-template-columns: 1fr;
  }

  .applet-stage,
  .applet-stage #diagonal-canvas {
    min-height: 390px;
  }

  .applet-note {
    font-size: 19px;
  }

  .function-controls {
    grid-template-columns: 1fr;
  }

  .function-stage {
    min-height: 520px;
  }

  .function-stage svg {
    height: 520px;
  }

  .catenary-controls {
    grid-template-columns: 1fr 1fr;
  }

  .catenary-length-control {
    grid-column: 1 / -1;
  }

  .catenary-controls button {
    min-width: 0;
  }

  .catenary-stage {
    min-height: 520px;
  }

  .catenary-stage canvas {
    height: 520px;
  }
}