:root {
  color-scheme: light;
  --bg: #ffffff;
  --paper: #ffffff;
  --paper-soft: #f2f6fa;
  --ink: #16273e;
  --muted: #596d80;
  --line: #d8e1e9;
  --line-strong: #c1cdd9;
  --green: #087f68;
  --green-dark: #066550;
  --green-soft: #edf7f3;
  --orange: #b96815;
  --orange-soft: #f7e5d8;
  --blue: #2766b1;
  --blue-soft: #e2edf4;
  --danger: #a24e43;
  --shadow: 0 16px 44px rgba(29, 37, 32, .12);
  font-family: Arial, Helvetica, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 82% 4%, rgba(76, 120, 150, .13), transparent 32rem),
    radial-gradient(circle at 10% 100%, rgba(47, 125, 91, .12), transparent 38rem),
    var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

button,
input,
a {
  font: inherit;
}

button,
a,
input[type="range"] {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible + label,
input[type="range"]:focus-visible {
  outline: 3px solid rgba(76, 120, 150, .38);
  outline-offset: 2px;
}

.app-shell {
  width: min(100%, 1440px);
  min-height: 100vh;
  min-height: 100dvh;
  margin-inline: auto;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

@media (min-width: 981px) {
  .app-shell {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
  }

  .workspace {
    overflow: hidden;
  }
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
  padding: 10px 20px 9px;
  border-bottom: 1px solid rgba(189, 203, 191, .86);
  background: rgba(255, 254, 250, .78);
  backdrop-filter: blur(15px);
}

.title-block {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--green);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: .16em;
}

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

h1 {
  margin-bottom: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(24px, 2.35vw, 34px);
  line-height: 1.05;
  letter-spacing: -.025em;
}

h2 {
  margin-bottom: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 21px;
  line-height: 1.1;
}

h3 {
  margin-bottom: 0;
  font-size: 12px;
  line-height: 1.2;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.model-chip,
.back-button {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.model-chip {
  padding: 0 13px;
  border: 1px solid #e5cbb8;
  background: var(--orange-soft);
  color: #81451f;
}

.back-button {
  gap: 7px;
  padding: 0 15px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  box-shadow: 0 5px 16px rgba(29, 37, 32, .18);
}

.back-button:hover {
  background: var(--green-dark);
}

.back-button svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.workspace {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(340px, .82fr);
  gap: 12px;
  padding: 12px 16px;
}

.scene-card,
.control-card {
  min-width: 0;
  min-height: 0;
  border: 1px solid rgba(189, 203, 191, .9);
  border-radius: 16px;
  background: rgba(255, 254, 250, .94);
  box-shadow: var(--shadow);
}

.scene-card {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}

.scene-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px 8px;
}

.scene-heading p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px 12px;
  max-width: 340px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 750;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px currentColor;
}

.legend-dot.target-a {
  background: var(--orange);
  color: var(--orange);
}

.legend-dot.target-b {
  background: var(--blue);
  color: var(--blue);
}

.scene-wrap {
  position: relative;
  min-height: 0;
  margin: 0 10px 8px;
}

.scene {
  width: 100%;
  height: 100%;
  min-height: 330px;
  display: block;
  overflow: visible;
}

.plot-background {
  fill: url(#groundWash);
  stroke: var(--line);
}

.fov circle {
  stroke-width: 2;
}

.fov-one circle {
  fill: rgba(47, 125, 91, .075);
  stroke: rgba(47, 125, 91, .68);
}

.fov-two circle {
  fill: rgba(76, 120, 150, .065);
  stroke: rgba(76, 120, 150, .72);
}

.fov text {
  font-size: 13px;
  font-weight: 850;
  letter-spacing: .08em;
}

.fov-one text {
  fill: var(--green-dark);
}

.fov-two text {
  fill: #365f7a;
}

.overlap-line {
  fill: none;
  stroke: rgba(29, 37, 32, .22);
  stroke-dasharray: 4 7;
}

.overlap-label rect {
  fill: rgba(255, 254, 250, .92);
  stroke: var(--line-strong);
}

.overlap-label text {
  fill: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .16em;
}

.route {
  fill: none;
  stroke-width: 2;
  stroke-dasharray: 5 7;
  opacity: .42;
}

.route-a {
  stroke: var(--orange);
}

.route-b {
  stroke: var(--blue);
}

.base-station circle {
  fill: #fff;
  stroke: var(--ink);
  stroke-width: 2;
  filter: url(#softShadow);
}

.base-station path {
  fill: none;
  stroke: var(--ink);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.base-station text {
  fill: var(--ink);
  font-size: 12px;
  font-weight: 900;
  text-anchor: middle;
}

.target {
  filter: url(#softShadow);
}

.target-core {
  fill: currentColor;
  stroke: #fff;
  stroke-width: 3;
}

.target-halo {
  fill: currentColor;
  opacity: .16;
}

.target-a-fill {
  color: var(--orange);
}

.target-b-fill {
  color: var(--blue);
}

.target-label rect {
  fill: var(--paper);
  stroke: currentColor;
  stroke-width: 1.5;
}

.target-label text {
  fill: currentColor;
  font-size: 11px;
  font-weight: 900;
}

.transfer path {
  fill: none;
  stroke: var(--green);
  stroke-dasharray: 8 6;
  stroke-width: 3;
  filter: url(#eventGlow);
}

.transfer .packet rect {
  fill: var(--green);
}

.transfer .packet text {
  fill: #fff;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: .08em;
}

.transfer.is-active path {
  animation: march .55s linear infinite;
}

.transfer.is-active .packet {
  animation: packetPulse .8s ease-in-out infinite alternate;
}

.measurement,
.estimate {
  fill: none;
  stroke: currentColor;
}

.target-a-stroke {
  color: var(--orange);
}

.target-b-stroke {
  color: var(--blue);
}

.measurement-link {
  opacity: .55;
  stroke-dasharray: 3 4;
  stroke-width: 1.5;
}

.measurement-mark {
  stroke-linecap: round;
  stroke-width: 2.5;
}

.estimate .belief {
  fill: currentColor;
  fill-opacity: .08;
  stroke-dasharray: 4 3;
  stroke-width: 1.8;
}

.estimate-mark {
  stroke-linecap: round;
  stroke-width: 2;
}

.is-hidden {
  display: none;
}

.scale path {
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.4;
}

.scale text {
  fill: var(--muted);
  font-size: 10px;
  font-weight: 750;
}

.scene-callout {
  position: absolute;
  right: 12px;
  bottom: 11px;
  left: 142px;
  min-height: 32px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid rgba(189, 203, 191, .9);
  border-radius: 9px;
  background: rgba(255, 254, 250, .92);
  box-shadow: 0 6px 18px rgba(29, 37, 32, .1);
  color: var(--muted);
  font-size: 10px;
  font-weight: 720;
  backdrop-filter: blur(8px);
}

.scene-callout.is-event {
  border-color: rgba(47, 125, 91, .42);
  background: rgba(230, 241, 233, .94);
  color: var(--green-dark);
}

.status-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--line-strong);
}

.scene-callout.is-event .status-dot {
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(47, 125, 91, .13);
}

.transport {
  display: grid;
  grid-template-columns: auto minmax(125px, .28fr) minmax(160px, 1fr);
  align-items: center;
  gap: 10px;
  padding: 9px 12px 11px;
  border-top: 1px solid var(--line);
  background: rgba(247, 248, 242, .86);
}

.transport-buttons {
  display: flex;
  gap: 6px;
}

button {
  min-height: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  font-size: 11px;
  font-weight: 820;
}

button:not(:disabled):hover {
  border-color: var(--green);
  color: var(--green-dark);
}

button:disabled {
  cursor: not-allowed;
  opacity: .46;
}

.transport button {
  padding: 0 10px;
  white-space: nowrap;
}

.play-button {
  min-width: 74px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-color: var(--green);
  background: var(--green);
  color: #fff;
}

.play-button:not(:disabled):hover {
  background: var(--green-dark);
  color: #fff;
}

.play-button svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.play-button .pause-icon {
  display: none;
}

.play-button[aria-pressed="true"] .play-icon {
  display: none;
}

.play-button[aria-pressed="true"] .pause-icon {
  display: block;
}

.timeline-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 7px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
}

.timeline-label output {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  height: 22px;
  margin: 0;
  accent-color: var(--green);
  cursor: pointer;
}

input[type="range"]:disabled {
  cursor: not-allowed;
  opacity: .55;
}

.timeline {
  background: linear-gradient(90deg, var(--green) var(--timeline-progress, 0%), var(--line) var(--timeline-progress, 0%));
}

.control-card {
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 14px;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.control-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 11px;
}

.equation {
  max-width: 170px;
  padding: 7px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-soft);
  color: var(--green-dark);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  text-align: center;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.mode-control legend,
.slider-group > label {
  margin-bottom: 6px;
  color: var(--ink);
  font-size: 11px;
  font-weight: 850;
}

.segmented-control {
  display: grid;
  grid-template-columns: .72fr 1.28fr;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--paper-soft);
}

.segmented-control input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
}

.segmented-control label {
  min-height: 31px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5px 7px;
  border-radius: 6px;
  color: var(--muted);
  cursor: pointer;
  font-size: 9px;
  font-weight: 850;
  text-align: center;
}

.segmented-control input:checked + label {
  background: #fff;
  box-shadow: 0 3px 10px rgba(29, 37, 32, .12);
  color: var(--green-dark);
}

.segmented-control input:disabled + label {
  cursor: not-allowed;
}

.mode-control p {
  min-height: 29px;
  margin: 5px 2px 8px;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.4;
}

.slider-group {
  margin-top: 8px;
}

.slider-group > label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.slider-group output {
  min-width: 41px;
  padding: 3px 5px;
  border-radius: 6px;
  background: var(--green-soft);
  color: var(--green-dark);
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.slider-group input {
  display: block;
  height: 18px;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: #808a83;
  font-size: 8px;
  font-weight: 750;
}

.gate-panel {
  margin-top: 11px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.section-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.section-label-row > span {
  color: var(--muted);
  font-size: 8px;
  font-weight: 850;
}

.gate-row {
  display: grid;
  grid-template-columns: 24px minmax(70px, 1fr) 25px minmax(70px, 1fr) 38px;
  align-items: center;
  gap: 5px;
  margin-top: 5px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-soft);
}

.gate-row.is-open {
  border-color: rgba(47, 125, 91, .38);
  background: var(--green-soft);
}

.gate-target {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  font-size: 9px;
  font-weight: 900;
}

.gate-target.target-b-fill {
  background: var(--blue);
  color: #fff;
}

.gate-metric {
  min-width: 0;
}

.gate-metric > span {
  display: flex;
  justify-content: space-between;
  gap: 4px;
  color: var(--muted);
  font-size: 8px;
  white-space: nowrap;
}

.gate-metric b {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.gate-metric i {
  height: 4px;
  display: block;
  overflow: hidden;
  margin-top: 3px;
  border-radius: 2px;
  background: var(--line);
}

.gate-metric i span {
  width: 0;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: var(--green);
  transition: width .16s linear;
}

.gate-and {
  color: #8b958e;
  font-size: 7px;
  font-weight: 900;
  text-align: center;
}

.gate-state {
  padding: 3px 2px;
  border-radius: 5px;
  background: #ecefe9;
  color: var(--muted);
  font-size: 7px;
  letter-spacing: .04em;
  text-align: center;
}

.gate-row.is-open .gate-state {
  background: var(--green);
  color: #fff;
}

.counter-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
  margin-top: 9px;
}

.counter-panel div {
  min-width: 0;
  padding: 7px 5px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  text-align: center;
}

.counter-panel span {
  min-height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 7px;
  font-weight: 800;
  line-height: 1.2;
}

.counter-panel strong {
  display: block;
  margin-top: 2px;
  color: var(--green-dark);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  font-variant-numeric: tabular-nums;
}

.tradeoff-note,
.disclaimer {
  border-radius: 8px;
  font-size: 8.5px;
  line-height: 1.4;
}

.tradeoff-note {
  margin-top: 8px;
  padding: 7px 8px;
  border-left: 3px solid var(--green);
  background: var(--green-soft);
  color: var(--green-dark);
}

.disclaimer {
  margin: 7px 0 0;
  padding: 7px 8px;
  border: 1px solid #ead2c2;
  background: #fff8f2;
  color: #6e584a;
}

.app-footer {
  min-height: 31px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 5px 20px 7px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 720;
}

kbd {
  min-width: 19px;
  display: inline-block;
  padding: 1px 4px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink);
  font: 750 8px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  text-align: center;
}

.noscript-note {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 20;
  max-width: 390px;
  padding: 11px 14px;
  border: 1px solid #e5cbb8;
  border-radius: 9px;
  background: #fff8f2;
  box-shadow: var(--shadow);
  color: #6e584a;
  font-size: 12px;
}

@keyframes march {
  to { stroke-dashoffset: -28; }
}

@keyframes packetPulse {
  from { opacity: .76; transform: translateY(1px); }
  to { opacity: 1; transform: translateY(-2px); }
}

@media (max-width: 980px) {
  .app-shell {
    display: block;
  }

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

  .scene-card {
    min-height: 610px;
  }

  .control-card {
    overflow: visible;
  }
}

@media (max-width: 680px) {
  .app-header,
  .scene-heading,
  .app-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .app-header {
    padding: 13px 14px;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .workspace {
    padding: 8px;
  }

  .scene-card {
    min-height: 570px;
  }

  .scene-heading {
    padding-bottom: 2px;
  }

  .legend {
    justify-content: flex-start;
  }

  .scene {
    min-height: 300px;
  }

  .scene-callout {
    left: 12px;
  }

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

  .transport-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .app-footer {
    gap: 5px;
    padding-inline: 12px;
  }
}

@media (max-height: 760px) and (min-width: 981px) {
  .app-header {
    min-height: 60px;
    padding-block: 7px;
  }

  h1 {
    font-size: 27px;
  }

  .workspace {
    padding-block: 8px;
  }

  .scene-heading {
    padding-block: 9px 4px;
  }

  .scene {
    min-height: 300px;
  }

  .app-footer {
    min-height: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

/* The preceding slide supplies the explanation; keep the embedded lab compact. */
html.is-bento-embedded .mode-control p,
html.is-bento-embedded .range-labels,
html.is-bento-embedded .tradeoff-note,
html.is-bento-embedded .disclaimer {
  display: none;
}

html.is-bento-embedded .control-heading { margin-bottom: 8px; }
html.is-bento-embedded .gate-panel { margin-top: 7px; padding-top: 7px; }