:root {
  --bg: #f5f7fb;
  --fg: #1d2433;
  --card: #ffffff;
  --line: #d7deea;
  --accent: #0e7490;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: linear-gradient(135deg, #edf3ff 0%, #f7fafc 100%);
  color: var(--fg);
}

.container {
  max-width: 980px;
  margin: 24px auto;
  padding: 0 16px 24px;
}

h1 {
  margin-bottom: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin: 14px 0;
}

label {
  display: block;
  margin: 10px 0 4px;
  font-weight: 600;
}

input,
textarea,
button {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  font-size: 14px;
}

textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

button {
  margin-top: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
}

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

pre {
  background: #0f172a;
  color: #dbeafe;
  border-radius: 8px;
  padding: 10px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.row button {
  width: auto;
  padding: 8px 12px;
  margin-top: 0;
}

.hint {
  margin: 8px 0;
  font-size: 13px;
  color: #334155;
}

.canvas-wrap {
  width: 100%;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0b1020;
}

#screenCanvas {
  display: block;
  max-width: 100%;
  margin: 0 auto;
  cursor: crosshair;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 720px) {
  .actions {
    grid-template-columns: 1fr;
  }
}