:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --text: #e9ecf1;
  --muted: #9aa3b2;
  --accent: #1fa8e0;
  --accent-dark: #0c6f9c;
  --border: #2a2f3a;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6f9;
    --card: #ffffff;
    --text: #1b1f27;
    --muted: #5b6475;
    --accent: #0c6f9c;
    --accent-dark: #084f70;
    --border: #e1e5eb;
  }
}

* { box-sizing: border-box; }

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

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

h1 { font-size: 1.8rem; margin-bottom: 4px; }
.subtitle { color: var(--muted); margin-top: 0; }

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

label {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 14px;
}

input, select {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

input:disabled { opacity: 0.6; }

.hint { font-size: 0.8rem; color: var(--muted); }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.checkbox-row label { margin: 0; color: var(--text); }
.checkbox-row input { width: auto; margin: 0; }

button {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: var(--accent-dark); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

.message { min-height: 1.2em; font-size: 0.9rem; }
.message.error { color: #e05d5d; }
.message.success { color: #35c17a; }

canvas {
  width: 100%;
  background: #f4f1ea;
  border-radius: 8px;
  border: 1px solid var(--border);
}