:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --muted: #5f6368;
  --bg: #fbfbf9;
  --panel: #ffffff;
  --border: #d4d4d0;
  --accent: #1f6b4f;
  --warn: #8a4b00;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #ececea;
    --muted: #a3a3a0;
    --bg: #141414;
    --panel: #1d1d1d;
    --border: #3a3a38;
    --accent: #7fd1ab;
    --warn: #f2b870;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent); }
code, kbd { font-family: var(--mono); font-size: 0.9em; }
kbd { border: 1px solid var(--border); border-radius: 4px; padding: 0 0.3em; }

/* Home page */
.home main { max-width: 46rem; margin: 0 auto; padding: 2.5rem 1rem 4rem; }
.home h1 { margin: 0 0 0.5rem; font-size: 1.75rem; }
.home h2 { margin-top: 2.5rem; font-size: 1.25rem; }
form { display: grid; gap: 1rem; margin: 1.5rem 0; padding: 1.25rem; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; }
label { display: grid; gap: 0.25rem; font-weight: 600; font-size: 0.95rem; }
label.check { display: flex; align-items: center; gap: 0.5rem; font-weight: 400; }
input, select { font: inherit; padding: 0.45rem 0.55rem; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--fg); }
input[type="checkbox"] { width: 1.05rem; height: 1.05rem; }
.row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: end; }
.row label:not(.check) { min-width: 8rem; }
fieldset { border: 1px solid var(--border); border-radius: 6px; padding: 0.75rem 1rem; display: grid; gap: 0.4rem; }
legend { font-weight: 600; font-size: 0.95rem; padding: 0 0.25rem; }
.links { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.button { display: inline-block; padding: 0.6rem 1rem; border-radius: 6px; background: var(--accent); color: var(--bg); text-decoration: none; font-weight: 600; }
.button[aria-disabled="true"] { opacity: 0.45; cursor: not-allowed; }
.hint { color: var(--muted); font-size: 0.9rem; }
.scenarios li { margin-bottom: 0.75rem; }

/* Test pages */
.testbed { min-height: 100vh; display: flex; flex-direction: column; }
.bar { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; align-items: baseline; padding: 0.6rem 1rem; border-bottom: 1px solid var(--border); background: var(--panel); font-size: 0.9rem; }
.bar a { font-weight: 600; text-decoration: none; }
.settings { color: var(--muted); font-family: var(--mono); font-size: 0.8rem; overflow-wrap: anywhere; }
#target { flex: 1; min-height: 45vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 1rem; outline: none; }
.task { flex-direction: column; }
.stimulus { font-size: 4rem; font-weight: 700; margin: 0; }
.notice { max-width: 36rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; justify-content: center; padding: 0 1rem 1rem; }
.actions button { font: inherit; padding: 0.45rem 0.9rem; border-radius: 6px; border: 1px solid var(--border); background: var(--panel); color: var(--fg); cursor: pointer; }
.log-panel { border-top: 1px solid var(--border); background: var(--panel); padding: 0.5rem 1rem 1rem; }
.log-panel h2 { font-size: 0.85rem; margin: 0.25rem 0 0.5rem; color: var(--muted); text-transform: none; }
.log { font-family: var(--mono); font-size: 0.78rem; max-height: 30vh; overflow-y: auto; white-space: pre-wrap; overflow-wrap: anywhere; }
.log-line { padding: 1px 0; }
.log-warn { color: var(--warn); }