:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #15202b;
  --muted: #4b5563;
  --line: #d7e0ea;
  --alpha: #cc2f4a;
  --beta: #1f6fd1;
  --gamma: #c58b00;
  --accent: #0f766e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Sans 3", "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 5% 10%, #dfefff 0%, transparent 33%),
    radial-gradient(circle at 85% 90%, #d9f8ee 0%, transparent 38%),
    var(--bg);
}

.layout {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0.5rem;
  display: grid;
  grid-template-columns: minmax(320px, 430px) 1fr;
  gap: 0.75rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 8px 22px rgba(17, 24, 39, 0.08);
}

.controls {
  padding: 1rem;
  overflow: visible;
}

h1 {
  margin: 0;
  font-size: 1.3rem;
}

h2 {
  margin: 0;
  font-size: 1.02rem;
}

.intro {
  margin: 0.6rem 0 1rem;
  color: var(--muted);
}

.row {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.8rem;
}

.row-toggle {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.toggle-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--muted);
}

.toggle-inline input {
  width: auto;
}

label,
legend {
  font-weight: 600;
  font-size: 0.95rem;
}

input[type="range"],
select,
button {
  width: 100%;
}

output {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

select,
button {
  border: 1px solid #c8d6e6;
  border-radius: 8px;
  background: #fff;
  min-height: 38px;
  padding: 0 0.65rem;
}

button {
  background: #f9fbff;
  cursor: pointer;
}

button:hover {
  border-color: #95afcc;
  background: #f0f6ff;
}

fieldset {
  margin: 0.9rem 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  display: grid;
  gap: 0.35rem;
}

fieldset label {
  font-weight: 500;
}

.buttons {
  display: grid;
  gap: 0.5rem;
}

.measurement-box {
  margin: 0.9rem 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.75rem;
  background: #f7fafc;
}

.measurement-box p {
  margin: 0.45rem 0 0.7rem;
  color: var(--muted);
}

.sim {
  position: relative;
  padding: 0.6rem;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto auto;
  min-height: 0;
}

canvas {
  width: 100%;
  height: 100%;
  min-height: 0;
  border: 1px solid #ccdae8;
  border-radius: 10px;
  background: linear-gradient(180deg, #fdfefe 0%, #f5fbff 100%);
}

.legend {
  display: flex;
  gap: 0.55rem;
  margin-top: 0.45rem;
}

.sim-controls {
  margin-top: 0.5rem;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(220px, 1fr);
  gap: 0.6rem;
  align-items: start;
}

.sim-controls fieldset {
  margin: 0;
}

.sim-controls .buttons {
  align-self: start;
}

.sim-controls .measurement-box {
  margin: 0;
  grid-column: 1 / -1;
}

.chip {
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}

.chip.alpha {
  background: var(--alpha);
}

.chip.beta {
  background: var(--beta);
}

.chip.gamma {
  background: var(--gamma);
}

@media (max-width: 1080px) {
  body {
    overflow: auto;
  }

  .layout {
    grid-template-columns: 1fr;
    height: auto;
  }

  .controls {
    overflow: visible;
  }

  .sim {
    grid-template-rows: auto auto auto;
  }

  canvas {
    height: auto;
  }

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

@media (min-width: 1081px) {
  body {
    height: 100vh;
    overflow: hidden;
  }

  .layout {
    height: 100vh;
  }
}