html {
  background: #fff;
  color: #111;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  margin: 0;
  padding: 20px;
}

main {
  margin: 0 auto;
  max-width: 1120px;
}

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

.page-header {
  align-items: start;
  border-bottom: 1px solid #111;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr) auto;
  margin-bottom: 18px;
  padding-bottom: 14px;
}

.page-header h1 {
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1;
  margin-bottom: 8px;
}

.page-header p {
  max-width: 620px;
}

.status-panel {
  border: 1px solid #111;
  display: grid;
  gap: 6px;
  min-width: 220px;
  padding: 10px;
}

.setup-panel,
.fan-mode-panel,
.simulation-panel,
.controls-panel,
.feedback-panel {
  border-top: 1px solid #111;
  margin-top: 18px;
  padding-top: 14px;
}

.fan-mode-panel {
  align-items: end;
  border: 1px solid #111;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(280px, 1.5fr) minmax(190px, 0.7fr) auto;
  margin-top: 18px;
  padding: 14px;
}

.fan-mode-panel h2,
.fan-mode-panel p {
  margin-bottom: 6px;
}

.fan-mode-panel button {
  min-height: 40px;
  padding: 8px 12px;
}

.fan-mode-panel #fanInputModeStatus {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.simulation-panel {
  border: 1px solid #111;
  margin-top: 18px;
  padding: 14px;
}

.simulation-heading {
  align-items: start;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr) auto;
}

.simulation-heading h2,
.simulation-heading p {
  margin-bottom: 6px;
}

.simulation-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.simulation-links a {
  color: #111;
}

.simulation-controls {
  align-items: end;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(140px, 0.7fr) minmax(160px, 0.7fr) minmax(260px, 1.4fr);
  margin-top: 10px;
}

.simulation-actions {
  display: flex;
  gap: 8px;
}

.simulation-actions button {
  min-height: 40px;
  padding: 8px 12px;
}

.simulation-feedback {
  margin-top: 12px;
}

.simulation-feedback p {
  margin-bottom: 6px;
}

.simulation-feedback progress {
  accent-color: #111;
  height: 12px;
  width: 100%;
}

.setup-panel {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
}

label {
  display: grid;
  font-weight: 700;
  gap: 5px;
}

input,
select,
button {
  background: #fff;
  border: 1px solid #111;
  border-radius: 0;
  color: #111;
  font: inherit;
}

input,
select {
  box-sizing: border-box;
  min-height: 40px;
  padding: 8px 10px;
  width: 100%;
}

button {
  cursor: pointer;
}

button:disabled {
  border-color: #888;
  color: #777;
  cursor: wait;
}

.fan-stage {
  display: grid;
  gap: 34px;
  grid-template-columns: minmax(260px, 1fr) minmax(260px, 1fr);
  margin-top: 20px;
}

.unit {
  border: 1px solid #111;
  min-height: 540px;
  padding: 18px;
}

.unit h2 {
  font-size: 18px;
  margin-bottom: 26px;
}

.fan-stack {
  display: grid;
  gap: 58px;
  width: 100%;
}

.fan-button {
  align-items: center;
  border: 5px solid #111;
  box-sizing: border-box;
  display: grid;
  gap: 4px;
  justify-items: start;
  min-height: 88px;
  padding: 12px 14px;
  position: relative;
  text-align: left;
  transition: background 120ms ease, box-shadow 120ms ease, transform 120ms ease;
}

.fan-button:hover,
.fan-button:focus-visible {
  box-shadow: 0 0 0 4px #ddd;
  outline: none;
}

.fan-button:active {
  transform: translateY(1px);
}

.fan-button.is-active {
  background: #fff0a6;
  box-shadow: inset 0 0 0 6px #f1c400;
}

.fan-label {
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
}

.fan-state,
.fan-reason {
  font-size: 14px;
}

.unit-left .fan-l1 {
  margin-left: 4%;
  width: 72%;
}

.unit-left .fan-l2 {
  margin-left: 24%;
  width: 78%;
}

.unit-left .fan-l3 {
  margin-left: 0;
  width: 70%;
}

.unit-right {
  justify-items: end;
}

.unit-right .fan-stack {
  justify-items: end;
  width: 100%;
}

.unit-right .fan-r1 {
  margin-right: 0;
  width: 72%;
}

.unit-right .fan-r2 {
  margin-right: 24%;
  width: 78%;
}

.unit-right .fan-r3 {
  margin-right: 2%;
  width: 72%;
}

.controls-panel {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.button-row button {
  min-height: 42px;
  padding: 8px 12px;
}

.feedback-panel {
  font-size: 18px;
}

.feedback-panel p {
  margin-bottom: 8px;
}

@media (max-width: 760px) {
  body {
    padding: 14px;
  }

  .page-header,
  .setup-panel,
  .fan-mode-panel,
  .simulation-heading,
  .simulation-controls,
  .fan-stage,
  .controls-panel {
    grid-template-columns: 1fr;
  }

  .unit {
    min-height: auto;
  }

  .fan-stack {
    gap: 20px;
  }

  .fan-button,
  .unit-left .fan-l1,
  .unit-left .fan-l2,
  .unit-left .fan-l3,
  .unit-right .fan-r1,
  .unit-right .fan-r2,
  .unit-right .fan-r3 {
    margin-left: 0;
    margin-right: 0;
    width: 100%;
  }
}