:root {
  color-scheme: dark;
  --background: #081014;
  --ink: #edf3ef;
  --muted: #a1b1b6;
  --solar: #ffb547;
  --air: #47d7dc;
  --thermal: #ff826b;
  --leaf: #9edf9f;
  --line: #30444c;
  --mono: Consolas, "Liberation Mono", monospace;
}
* {
  box-sizing: border-box;
}
html {
  background: var(--background);
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background:
    linear-gradient(#47d7dc05 1px, transparent 1px),
    linear-gradient(90deg, #47d7dc05 1px, transparent 1px), var(--background);
  background-size: 32px 32px;
  color: var(--ink);
  font:
    16px/1.5 system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
}
button,
input {
  font: inherit;
}
button {
  color: inherit;
  cursor: pointer;
}
a {
  color: inherit;
}
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--air);
  outline-offset: 4px;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
.skip-link {
  position: fixed;
  top: -100px;
  left: 12px;
  background: var(--ink);
  color: #081014;
  padding: 12px;
  z-index: 40;
}
.skip-link:focus {
  top: 12px;
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--line);
  background: #081014f2;
  min-height: 72px;
}
.wordmark {
  display: grid;
  text-decoration: none;
}
.wordmark span {
  font-size: 18px;
  letter-spacing: 0.18em;
  font-weight: 850;
}
.wordmark small {
  color: var(--muted);
  font: 12px/1.5 var(--mono);
}
.site-header__right {
  display: flex;
  align-items: center;
  gap: 18px;
}
.site-header__right > a {
  font-size: 14px;
}
.method-badge {
  color: var(--leaf);
  font: 12px/1.4 var(--mono);
}
.export-button,
.reset-button {
  border: 1px solid var(--line);
  background: var(--ink);
  color: #081014;
  border-radius: 3px;
  min-height: 44px;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 650;
}
.reset-button {
  background: transparent;
  color: var(--ink);
  width: 44px;
  flex-shrink: 0;
  font-size: 24px;
}
.export-button:hover,
.reset-button:hover {
  border-color: var(--air);
}
.intro {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  display: block;
  color: var(--muted);
  font: 12px/1.5 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.intro h1 {
  font-size: clamp(25px, 2.8vw, 42px);
  font-weight: 420;
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin: 5px 0 0;
  max-width: 620px;
}
.intro p {
  border-left: 2px solid var(--solar);
  padding-left: 18px;
  color: var(--muted);
  margin: 0;
  max-width: 610px;
}
.climate-strip {
  display: grid;
  grid-template-columns: 210px auto 1fr;
  gap: 20px;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  background: #0d191d;
}
.climate-strip__label {
  display: flex;
  gap: 10px;
  align-items: center;
}
.climate-strip__label > b {
  font-size: 25px;
  color: var(--solar);
}
.climate-strip__label span {
  display: grid;
}
.climate-strip__label small {
  font-size: 12px;
  color: var(--muted);
}
.climate-strip__label strong {
  font-size: 14px;
}
.climate-strip p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}
.climate-options,
.lens-switcher {
  display: flex;
}
.climate-options button,
.lens-switcher button {
  border: 1px solid var(--line);
  background: transparent;
  min-height: 44px;
  padding: 8px 10px;
  font-size: 14px;
  margin-left: -1px;
}
.climate-options button:first-child,
.lens-switcher button:first-child {
  margin-left: 0;
}
.climate-options button:hover,
.lens-switcher button:hover {
  background: #20353c;
}
.climate-options .is-active,
.lens-switcher [aria-pressed="true"] {
  background: var(--air);
  color: #061013;
  border-color: var(--air);
  position: relative;
}
.quick-result {
  padding: 10px 24px;
  margin: 0;
  border-bottom: 1px solid var(--line);
  color: var(--leaf);
  font-size: 14px;
  background: #10231d;
}
.studio {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(430px, 1.7fr) minmax(290px, 1fr);
  align-items: start;
}
.panel {
  padding: 22px;
  min-width: 0;
}
.design-panel {
  border-right: 1px solid var(--line);
}
.consequence-panel {
  border-left: 1px solid var(--line);
}
.canvas-panel {
  background: #09151a88;
}
.panel__title,
.canvas-panel__head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
}
.panel__title h2,
.canvas-panel__head h2 {
  font-size: 21px;
  font-weight: 500;
  margin: 4px 0 0;
  line-height: 1.2;
}
.panel__intro {
  color: var(--muted);
  margin: 18px 0 8px;
}
.control {
  border-top: 1px solid var(--line);
  padding: 14px 0 10px;
}
.control__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}
.control__head label {
  font-size: 14px;
  font-weight: 650;
}
.control__head output {
  font: 12px/1.5 var(--mono);
  color: var(--air);
  white-space: nowrap;
}
.control-note {
  color: var(--muted);
  font-size: 12px;
  margin: 12px 0 0;
}
input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  display: block;
  width: 100%;
  height: 32px;
  cursor: pointer;
  background: linear-gradient(90deg, var(--air) var(--progress), var(--line) var(--progress))
    center/100% 3px no-repeat;
  margin: 4px 0;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border: 2px solid var(--air);
  border-radius: 50%;
  background: #071013;
}
input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 2px solid var(--air);
  border-radius: 50%;
  background: #071013;
}
input[type="range"]:focus-visible {
  outline: 2px solid var(--air);
  outline-offset: 2px;
}
.canvas-panel__head {
  flex-wrap: wrap;
}
.section-diagram {
  display: block;
  width: 100%;
  height: auto;
  max-height: 360px;
  margin: 12px 0;
  overflow: visible;
}
.section-diagram text {
  font-family: var(--mono);
}
.ground-line,
.shell-line,
.roof-line {
  fill: none;
  stroke: #c5d4d2;
  stroke-width: 2;
}
.ground-line {
  stroke: #647c85;
  stroke-width: 1;
}
.roof-line {
  stroke-width: 5;
}
.hatch {
  stroke: #849ba2;
  stroke-width: 0.6;
}
.mass-floor {
  stroke: #9db1b7;
  stroke-width: 1;
}
.window {
  fill: var(--air);
  stroke: var(--air);
  stroke-width: 2;
}
.shade-line {
  stroke: #dce9e6;
  stroke-width: 6;
}
.dimension-line {
  stroke: #849ba2;
  stroke-width: 0.7;
}
.dimension-text {
  fill: #c0d0d3;
  font-size: 15px;
}
.sun-disc {
  fill: var(--solar);
}
.sun-ray {
  fill: none;
  stroke: var(--solar);
  stroke-dasharray: 7 6;
  stroke-width: 2;
}
.sun-ray--soft {
  opacity: 0.4;
}
.airflow path {
  fill: none;
  stroke: var(--air);
  stroke-linecap: round;
  stroke-width: 3;
}
.air-marker {
  fill: var(--air);
}
.interior-objects {
  fill: none;
  opacity: 0.6;
  stroke: #c5d6d1;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.3;
}
.drawing-labels text {
  fill: #9fb3bc;
  font-size: 13px;
}
.selected-reading {
  font: 14px/1.65 var(--mono);
  color: var(--ink);
  border-left: 2px solid var(--air);
  padding-left: 12px;
  margin: 0 0 20px;
}
.day-ribbon {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}
.day-ribbon__head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
}
.day-ribbon__head strong {
  font-size: 14px;
  display: block;
  font-weight: 500;
}
.day-ribbon__time {
  color: var(--air);
  font: 12px/1.5 var(--mono);
  white-space: nowrap;
}
.day-ribbon__plot {
  height: 110px;
  position: relative;
  margin-top: 16px;
}
.day-ribbon__plot svg {
  height: 84px;
  width: 100%;
  overflow: visible;
}
.temperature-line {
  fill: none;
  stroke: var(--thermal);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}
.outdoor-line {
  fill: none;
  stroke: var(--muted);
  stroke-dasharray: 4 4;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}
.comfort-band {
  fill: var(--leaf);
  opacity: 0.12;
}
#chart-cursor {
  stroke: var(--ink);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  opacity: 0.7;
}
.day-ribbon__ticks {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font: 12px/1.5 var(--mono);
  margin-top: 3px;
}
.chart-scale {
  font-size: 12px;
  color: var(--muted);
  margin: 10px 0 0;
}
.score-block {
  display: flex;
  gap: 14px;
  align-items: center;
  margin: 22px 0 12px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.score-ring {
  height: 80px;
  width: 80px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  position: relative;
  border-radius: 50%;
  background: conic-gradient(var(--leaf) var(--score), #263b42 0);
}
.score-ring:after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 50%;
  background: #0b1519;
}
.score-ring span {
  position: relative;
  z-index: 1;
  font: 22px var(--mono);
}
.score-block > div:last-child {
  display: grid;
  gap: 3px;
}
.score-block small,
.score-block > div:last-child > span {
  font-size: 12px;
  color: var(--muted);
}
.score-block strong {
  font-size: 16px;
  font-weight: 500;
}
.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.metric {
  padding: 16px 8px 14px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.metric:nth-child(even) {
  padding-left: 12px;
  border-left: 1px solid var(--line);
}
.metric__label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  min-height: 36px;
}
.metric strong {
  font: 20px/1.5 var(--mono);
  display: block;
}
.metric > span:last-child {
  font-size: 12px;
  color: var(--muted);
  display: block;
}
.metric--leaf strong {
  color: var(--leaf);
}
.metric--thermal strong {
  color: var(--thermal);
}
.metric--solar strong {
  color: var(--solar);
}
.metric--air strong {
  color: var(--air);
}
.observation {
  display: flex;
  gap: 10px;
  padding: 14px;
  margin-top: 18px;
  border: 1px solid #695126;
  background: #ffb5470a;
}
.observation > b {
  color: var(--solar);
}
.observation p {
  margin: 5px 0 0;
  font-size: 16px;
  color: #c4cfcb;
}
.compare-link {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  background: transparent;
  border: 0;
  min-height: 44px;
  padding: 8px 0;
  margin-top: 8px;
  color: var(--air);
  font-size: 14px;
}
.comparison {
  display: grid;
  grid-template-columns: 0.9fr 1.3fr 0.8fr;
  gap: 30px;
  background: #dbe9e6;
  color: #071013;
  padding: 34px 24px;
}
.comparison .eyebrow,
.comparison__statement > span {
  color: #425b61;
  font: 12px/1.5 var(--mono);
}
.comparison h2 {
  font-size: 30px;
  font-weight: 450;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 6px 0 0;
}
.comparison__statement p {
  margin: 8px 0 0;
}
.comparison__bars {
  display: grid;
  gap: 18px;
  align-content: center;
}
.comparison__bars > div {
  display: grid;
  grid-template-columns: 75px 1fr 40px;
  gap: 10px;
  align-items: center;
  font-size: 14px;
}
.comparison__bars > div > div {
  height: 8px;
  background: #adc3bf;
}
.comparison__bars i {
  display: block;
  height: 100%;
  background: #0e777b;
}
.comparison__bars > div:first-child i {
  background: #677b7f;
}
.comparison__bars strong {
  font-size: 12px;
}
.method {
  padding: 42px 24px;
  border-bottom: 1px solid var(--line);
}
.method h2 {
  font-size: 32px;
  line-height: 1.15;
  font-weight: 420;
  margin: 8px 0 0;
  max-width: 800px;
}
.method__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.method__grid article {
  border-top: 1px solid var(--line);
  padding-top: 20px;
}
.method__grid article > span {
  color: var(--air);
  font-size: 22px;
}
.method__grid h3 {
  font-size: 18px;
  margin: 8px 0;
}
.method__grid p {
  color: var(--muted);
  margin: 0;
}
.assumptions {
  margin-top: 30px;
  border: 1px solid var(--line);
  padding: 16px 20px;
}
.assumptions summary {
  cursor: pointer;
  min-height: 30px;
  color: var(--air);
}
.assumptions p {
  max-width: 1000px;
  margin: 16px 0 0;
  color: var(--muted);
}
.assumptions a {
  text-underline-offset: 4px;
}
.reference-note {
  color: var(--muted);
  font-size: 14px;
  margin: 18px 0 0;
}
footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 24px;
  font: 12px/1.6 var(--mono);
  color: var(--muted);
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
@media (min-width: 1600px) {
  main {
    max-width: 1800px;
    margin: auto;
  }
  .panel {
    padding: 28px;
  }
  .section-diagram {
    max-height: 400px;
  }
}
@media (max-width: 1100px) {
  .studio {
    grid-template-columns: 270px 1fr;
  }
  .consequence-panel {
    grid-column: 1/-1;
    border-top: 1px solid var(--line);
    border-left: 0;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 14px 28px;
  }
  .consequence-panel .panel__title {
    grid-column: 1/-1;
  }
  .score-block {
    margin: 0;
  }
  .observation {
    margin: 0;
  }
  .metrics {
    grid-row: 2/4;
    grid-column: 2;
  }
  .climate-strip {
    grid-template-columns: 210px 1fr;
  }
  .climate-strip p {
    grid-column: 1/-1;
  }
  .comparison {
    grid-template-columns: 1fr 1fr;
  }
  .comparison__bars {
    grid-column: 1/-1;
  }
  .method__grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 700px) {
  .site-header {
    padding: 10px 16px;
  }
  .wordmark small {
    font-size: 12px;
    max-width: 170px;
  }
  .method-badge,
  .site-header__right > a {
    display: none;
  }
  .site-header__right {
    gap: 0;
  }
  .intro {
    padding: 18px 16px;
    display: block;
  }
  .intro h1 {
    font-size: 28px;
  }
  .intro p {
    font-size: 14px;
    margin: 12px 0 0;
    padding-left: 12px;
  }
  .climate-strip {
    padding: 12px 16px;
    display: block;
  }
  .climate-options {
    margin: 10px 0;
    flex-wrap: wrap;
  }
  .climate-options button {
    font-size: 13px;
    padding: 8px;
  }
  .climate-strip p {
    font-size: 14px;
  }
  .quick-result {
    padding: 10px 16px;
  }
  .studio {
    display: flex;
    flex-direction: column;
  }
  .panel {
    width: 100%;
    padding: 20px 16px;
  }
  .design-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .control-stack {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 20px;
  }
  .control__head {
    display: grid;
    gap: 2px;
  }
  .control__head output {
    font-size: 12px;
  }
  .control:last-child {
    grid-column: 1/-1;
  }
  .control:last-child .control__head {
    display: flex;
  }
  .panel__intro {
    font-size: 14px;
    margin: 12px 0;
  }
  .control {
    padding: 10px 0 6px;
  }
  .consequence-panel {
    display: block;
    order: 2;
  }
  .canvas-panel {
    order: 3;
    border-top: 1px solid var(--line);
  }
  .score-block {
    margin: 20px 0 0;
  }
  .observation {
    margin-top: 16px;
  }
  .canvas-panel__head {
    gap: 16px;
  }
  .section-diagram {
    margin: 20px 0;
  }
  .day-ribbon__head {
    align-items: start;
    flex-direction: column;
    gap: 6px;
  }
  .comparison {
    grid-template-columns: 1fr;
    padding: 28px 16px;
    gap: 20px;
  }
  .comparison__bars {
    grid-column: auto;
  }
  .method {
    padding: 32px 16px;
  }
  .method h2 {
    font-size: 28px;
  }
  .method__grid {
    grid-template-columns: 1fr;
  }
  .drawing-labels text {
    font-size: 16px;
  }
  .drawing-labels text:nth-child(2) {
    display: none;
  }
  .drawing-labels text:last-child {
    display: none;
  }
  footer {
    flex-direction: column;
    padding: 20px 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
.study-workspace {
  padding: 24px;
  border-bottom: 1px solid var(--line);
  background: #0d191d;
}
.study-workspace h2 {
  font-size: 26px;
  font-weight: 500;
  margin: 5px 0 12px;
}
.study-workspace p {
  max-width: 900px;
}
.name-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  max-width: 900px;
}
.name-grid label {
  display: grid;
  gap: 6px;
  font-size: 14px;
}
.name-grid input {
  width: 100%;
  min-width: 0;
  background: #081014;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--ink);
  padding: 10px;
}
.name-grid input:focus-visible {
  outline: 3px solid var(--air);
  outline-offset: 2px;
}
.study-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}
.study-actions button {
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #14262d;
  min-height: 44px;
  padding: 8px 14px;
  overflow-wrap: anywhere;
  max-width: 100%;
}
.study-actions [aria-pressed="true"] {
  background: var(--air);
  color: #071013;
}
.study-actions button:hover {
  border-color: var(--air);
}
button:disabled,
input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
[hidden] {
  display: none !important;
}
#study-status {
  color: var(--muted);
  margin-bottom: 0;
}
#study-error {
  color: #ffad99;
  margin: 8px 0 0;
  white-space: pre-wrap;
}
#active-alternative,
#result-alternative {
  overflow-wrap: anywhere;
}
.reference-line {
  fill: none;
  stroke: var(--solar);
  stroke-dasharray: 2 3;
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}
.comparison__bars > div {
  grid-template-columns: minmax(80px, 1fr) minmax(60px, 1fr) 40px;
}
.comparison__bars span {
  overflow-wrap: anywhere;
}
.change-explanations {
  grid-column: 1/-1;
  max-width: 1100px;
}
.change-explanations h3 {
  margin-bottom: 8px;
}
.change-explanations li {
  margin: 8px 0;
}
.change-explanations ul {
  padding-left: 20px;
}
dialog {
  background: #0d191d;
  color: var(--ink);
  border: 1px solid var(--air);
  border-radius: 6px;
  max-width: min(600px, calc(100vw - 32px));
  padding: 24px;
}
dialog::backdrop {
  background: #000b;
}
dialog h2 {
  font-size: 23px;
}
dialog p {
  color: var(--muted);
}
@media (max-width: 700px) {
  .study-workspace {
    padding: 20px 16px;
  }
  .name-grid {
    grid-template-columns: 1fr;
  }
  .study-actions button {
    flex: 1 1 140px;
  }
  .change-explanations {
    grid-column: auto;
  }
}