:root {
  --bg: #f4f0e8;
  --paper: #fff9ef;
  --ink: #2a2018;
  --accent: #b5522b;
  --line: #c7b9a3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #fff5df, var(--bg));
}

header {
  padding: 1rem 1.25rem;
  border-bottom: 2px solid var(--line);
  background: linear-gradient(90deg, #f9edd3, #f2dec0);
}

header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0.04em;
}

header p {
  margin: 0.35rem 0 0;
}

main {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1rem;
  padding: 1rem;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 10px 20px rgba(53, 34, 18, 0.08);
}

.controls {
  padding: 1rem;
  max-height: calc(100vh - 120px);
  overflow: auto;
}

.controls h2 {
  margin: 1rem 0 0.5rem;
  font-size: 1.05rem;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 0.2rem;
}

label {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

label.checkbox {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

input,
select,
button {
  font: inherit;
}

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

button {
  width: 100%;
  border: 0;
  border-radius: 8px;
  padding: 0.65rem 0.8rem;
  color: #fff8f0;
  background: linear-gradient(180deg, #ca6439, var(--accent));
  cursor: pointer;
  margin-top: 0.4rem;
}

button:hover {
  filter: brightness(1.05);
}

#status {
  margin-top: 0.75rem;
  font-size: 0.88rem;
}

.canvas-panel {
  padding: 0.75rem;
}

canvas {
  width: 100%;
  height: calc(100vh - 160px);
  border-radius: 8px;
  border: 1px solid #9a8f7a;
  background: #111;
}

@media (max-width: 980px) {
  main {
    grid-template-columns: 1fr;
  }

  .controls {
    max-height: none;
  }

  canvas {
    height: 55vh;
  }
}