@font-face {
  font-family: Inter;
  src: url(fonts/Inter-SemiBold.woff2) format("woff2");
}

:root {
  color-scheme: dark;
  --bg: #0b0d12;
  --panel: #151922;
  --line: #262c38;
  --text: #e6e9ef;
  --muted: #a3acbd;
  --accent: #14b8a6;
  --bad: #f87171;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px 24px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

h1 {
  margin: 0;
  font-size: 20px;
}

h2 {
  margin: 0 0 8px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

a {
  color: var(--accent);
}

main {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 16px;
  padding: 16px;
  max-width: 1400px;
  margin: 0 auto;
}

section {
  min-width: 0;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

section h2 + * {
  margin-top: 0;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  background: #000;
}

canvas:focus-visible,
button:focus-visible,
textarea:focus-visible,
.rows button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.hint,
#sizes,
#result {
  color: var(--muted);
}

.rows {
  display: grid;
  gap: 4px;
  margin-bottom: 16px;
}

.rows button {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 2fr;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  text-align: left;
  font: inherit;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.rows button[aria-pressed="true"] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, transparent);
}

textarea {
  width: 100%;
  height: 420px;
  padding: 8px;
  resize: vertical;
  font: 13px/1.4 ui-monospace, Menlo, Consolas, monospace;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
}

textarea[aria-invalid="true"] {
  border-color: var(--bad);
}

#status {
  margin: 8px 0 0;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  overflow-wrap: anywhere;
}

#status.bad {
  color: var(--bad);
}

.buttons {
  display: flex;
  gap: 8px;
}

.buttons button {
  padding: 6px 16px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.buttons button:disabled {
  opacity: 0.5;
  cursor: default;
}

#log {
  max-height: 340px;
  overflow: auto;
  margin: 0;
  padding-left: 24px;
  font: 13px/1.6 ui-monospace, Menlo, Consolas, monospace;
  overflow-wrap: anywhere;
}

#log .bad {
  color: var(--bad);
}

@media (max-width: 800px) {
  main {
    grid-template-columns: minmax(0, 1fr);
  }
}