:root {
  --bg: #f4f6fb; --card: #fff; --text: #1d2433; --muted: #6b7385; --line: #dde2ec;
  --accent: #2563eb; --accent-2: #1d4ed8; --region: rgba(37, 99, 235, .18);
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f141d; --card: #171d29; --text: #e6e9f0; --muted: #98a0b3; --line: #2a3242; --accent: #4f8cff; --accent-2: #3b76e8; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
header { text-align: center; padding: 28px 16px 8px; }
header h1 { margin: 0; font-size: 26px; }
header p { margin: 4px 0 0; color: var(--muted); }
main { max-width: 900px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: grid; gap: 12px; }
h2 { margin: 0; font-size: 18px; }
.hint, .meta, footer { color: var(--muted); font-size: 13px; }
.meta { text-align: right; margin-top: -8px; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; }
.grow { flex: 1 1 200px; }
label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); }
label.check { display: flex; align-items: center; gap: 8px; color: var(--text); }
select, input, textarea, button { font: inherit; color: var(--text); }
select, input[type=number], input:not([type]), textarea {
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; width: 100%;
}
textarea { resize: vertical; min-height: 140px; }
input[type=range] { width: 100%; accent-color: var(--accent); }
button { border: 1px solid var(--line); background: var(--bg); border-radius: 8px; padding: 9px 14px; cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { background: var(--accent-2); }
button.ghost { background: transparent; }
button:disabled { opacity: .55; cursor: wait; }
.status { min-height: 1.4em; font-size: 14px; }
.status.err { color: #dc2626; }
#wave { border: 1px solid var(--line); border-radius: 10px; padding: 6px; }
.times label { width: 140px; }
.speakers { display: grid; gap: 8px; }
.speakers .sp { display: flex; gap: 8px; align-items: center; }
.speakers .sp b { min-width: 90px; }
footer { text-align: center; padding: 20px 16px 32px; }
code { background: var(--bg); padding: 1px 5px; border-radius: 4px; }