:root {
  --bg: #f4f5f7;
  --fg: #16181d;
  --muted: #6b7180;
  --card: #ffffff;
  --border: #dde0e6;
  --accent: #2f6fed;
  --danger: #d6453d;
  --stage: #0d0f13;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --fg: #e8eaf0;
    --muted: #9097a6;
    --card: #1a1d24;
    --border: #2c313c;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
}

.card {
  margin: auto;
  width: min(380px, calc(100% - 32px));
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}
h1 { margin: 0 0 4px; font-size: 22px; }
.muted { color: var(--muted); }
.error { color: var(--danger); min-height: 1.4em; margin: 12px 0 0; }

form { display: grid; gap: 14px; margin-top: 18px; }
label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
input {
  font: inherit;
  font-size: 17px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
  letter-spacing: 0.04em;
}
button {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}
label.check { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--fg); cursor: pointer; }
label.check input { width: 16px; height: 16px; margin: 0; accent-color: var(--accent); }
button.link { border: 0; background: none; padding: 0; margin-top: 10px; color: var(--muted); font-size: 13px; text-decoration: underline; }
button[type="submit"] { background: var(--accent); border-color: var(--accent); color: #fff; padding: 11px; }
button.danger { color: var(--danger); }
button.active { border-color: var(--accent); color: var(--accent); }
select {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  border-radius: 8px;
  padding: 7px 8px;
  cursor: pointer;
}
.notice {
  position: fixed;
  left: 50%;
  top: 64px;
  transform: translateX(-50%);
  max-width: calc(100% - 32px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  box-shadow: 0 6px 24px rgb(0 0 0 / 0.25);
  z-index: 10;
}
.notice[hidden] { display: none; }
button:hover { filter: brightness(0.95); }

#session { flex: 1; display: flex; flex-direction: column; min-height: 0; }
#session[hidden] { display: none; }
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
.buttons { display: flex; gap: 6px; flex-wrap: wrap; }
.status { font-size: 13px; color: var(--muted); }
.status.ok::before { content: "● "; color: #2fa66a; }

#stage {
  flex: 1;
  min-height: 0;
  background: var(--stage);
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
}
#stage:focus-visible { box-shadow: inset 0 0 0 2px var(--accent); }
#screen {
  max-width: 100%;
  max-height: 100%;
  width: 100%;
  height: 100%;
  object-fit: contain;
  cursor: crosshair;
  touch-action: none;
  user-select: none;
}
.hint { font-size: 12px; margin: 0; padding: 8px 16px; }