* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: radial-gradient(circle at top, #0ea5e9 0%, #082f49 35%, #020617 100%);
  color: white;
}

.app {
  max-width: 1400px;
  margin: auto;
  padding: 26px;
}

header {
  text-align: center;
  margin-bottom: 24px;
}

.badge {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 999px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.18);
  color: #bae6fd;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(38px, 6vw, 70px);
  margin: 18px 0 12px;
  line-height: 1;
}

header p {
  max-width: 850px;
  margin: auto;
  color: #dbeafe;
  font-size: 20px;
  line-height: 1.7;
}

main {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 24px;
  align-items: stretch;
}

.canvas-card,
.panel {
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 28px;
  box-shadow: 0 20px 55px rgba(0,0,0,.35);
  backdrop-filter: blur(12px);
}

.canvas-card {
  overflow: hidden;
  min-height: 640px;
}

#canvas-holder {
  width: 100%;
  height: 100%;
}

.panel {
  padding: 26px;
}

.panel h2 {
  margin-top: 0;
  color: #7dd3fc;
}

label {
  display: block;
  margin: 22px 0;
  font-weight: 800;
  color: #e0f2fe;
}

input[type="range"],
select {
  width: 100%;
  margin-top: 10px;
}

select {
  padding: 12px;
  border-radius: 14px;
  border: none;
  font-weight: 700;
}

label span {
  display: block;
  margin-top: 8px;
  color: #bae6fd;
}

.toggles label {
  font-weight: 600;
  margin: 14px 0;
}

.formula {
  margin: 24px 0;
  padding: 20px;
  border-radius: 20px;
  background: rgba(2,6,23,.55);
  border-left: 6px solid #38bdf8;
}

.formula p {
  font-size: 24px;
  margin-bottom: 0;
}

.data {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.data div {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255,255,255,.10);
}

.data span {
  display: block;
  color: #bae6fd;
  font-size: 14px;
}

.data strong {
  font-size: 18px;
}

footer {
  margin-top: 24px;
  padding: 24px;
  border-radius: 22px;
  background: rgba(2,6,23,.55);
  color: #dbeafe;
  font-size: 18px;
  line-height: 1.7;
  text-align: center;
}

@media (max-width: 1000px) {
  main {
    grid-template-columns: 1fr;
  }

  .canvas-card {
    min-height: 520px;
  }
}