:root {
  --paper: #f5efe3;
  --paper-strong: #fffaf1;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: rgba(31, 41, 55, 0.1);
  --teal: #0f766e;
  --teal-soft: rgba(15, 118, 110, 0.13);
  --amber: #d97706;
  --amber-soft: rgba(217, 119, 6, 0.14);
  --berry: #be185d;
  --night: #0c1624;
}

html,
body,
#root {
  height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Space Grotesk", system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.16), transparent 32%),
    radial-gradient(circle at top right, rgba(217, 119, 6, 0.18), transparent 30%),
    linear-gradient(180deg, #f8f2e8 0%, #efe6d7 100%);
}

.font-mono-ui {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
}

.glass-panel {
  background: rgba(255, 250, 241, 0.82);
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px rgba(12, 22, 36, 0.08);
  backdrop-filter: blur(14px);
}

.preview-shell {
  background:
    radial-gradient(circle at top, rgba(15, 118, 110, 0.08), transparent 30%),
    linear-gradient(160deg, #102135 0%, #0c1624 60%, #13253b 100%);
}

.signal-gradient {
  background: linear-gradient(
    90deg,
    rgb(20, 39, 110) 0%,
    rgb(42, 132, 196) 22%,
    rgb(31, 191, 131) 48%,
    rgb(245, 183, 38) 74%,
    rgb(224, 62, 54) 100%
  );
}

.subtle-grid {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}

.metric-card {
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 1rem;
}

.soft-button {
  transition: transform 140ms ease, box-shadow 140ms ease, background-color 140ms ease;
}

.soft-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(12, 22, 36, 0.08);
}

input[type="file"]::file-selector-button {
  border: 0;
  border-radius: 999px;
  padding: 0.6rem 0.95rem;
  margin-right: 0.8rem;
  background: var(--night);
  color: #fff;
  cursor: pointer;
  font-family: "Space Grotesk", system-ui, sans-serif;
}

canvas {
  display: block;
}

.heatmap-canvas {
  width: 100%;
  height: auto;
  background: #fff;
  border-radius: 1rem;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: rgba(31, 41, 55, 0.24);
  border-radius: 999px;
}

::-webkit-scrollbar-track {
  background: transparent;
}