:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #14181f; --muted: #5b6472; --line: #dfe3e8;
  --accent: #1f6feb; --accent-text: #ffffff; --danger: #c62828; --warn-bg: #fff4e0; --warn-line: #f0b440;
  --ok: #1a7f37;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216; --card: #181c22; --text: #e8ebf0; --muted: #9aa4b2; --line: #2a3038;
    --accent: #4c8dff; --accent-text: #0b0e12; --danger: #ef5350; --warn-bg: #2b2413; --warn-line: #8a6a1c;
    --ok: #4cc26a;
  }
}
* { box-sizing: border-box; }
/* Author display rules (.form is flex) must not bring back what the page hid. */
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  display: flex; flex-direction: column;
}
header { padding: 14px 20px; border-bottom: 1px solid var(--line); background: var(--card); display: flex; align-items: baseline; gap: 10px; }
.brand { font-weight: 700; font-size: 20px; letter-spacing: .2px; }
.sub { color: var(--muted); }
.who { margin-left: auto; color: var(--muted); font-size: 15px; }
.seat { margin-left: 8px; }
.seat:not(:empty)::before { content: "· "; }
.seat.closed { color: var(--danger); }
a.buy { margin-left: 8px; color: var(--accent); font-weight: 600; }
main { flex: 1; display: flex; justify-content: center; padding: 24px 16px; min-height: 0; }
main > section { width: 100%; max-width: 560px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 28px; align-self: flex-start; }
main > section[hidden] { display: none !important; }
.lead { font-size: 21px; margin: 0 0 14px; }
.lead.live { color: var(--ok); font-weight: 600; }
.note { color: var(--muted); margin: 10px 0; }
.code { font: 700 56px/1.2 ui-monospace, "Cascadia Mono", Consolas, monospace; letter-spacing: 2px; text-align: center; padding: 18px 0; white-space: nowrap; }
@media (max-width: 480px) { .code { font-size: 38px; } }
.warn { background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: 8px; padding: 12px 14px; margin: 18px 0 0; font-size: 15px; }
.check { font-size: 19px; margin: 6px 0 0; }
.check b, .bar b { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; letter-spacing: 1px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.form { display: flex; flex-direction: column; gap: 12px; }
input { font: inherit; padding: 11px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.code-input { font: 700 30px ui-monospace, "Cascadia Mono", Consolas, monospace; letter-spacing: 3px; text-align: center; }
button { font: inherit; padding: 11px 18px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.danger { border-color: var(--danger); color: var(--danger); }
button.link { border: 0; background: none; padding: 0 0 0 8px; color: var(--accent); }
a.button { display: inline-block; font: inherit; padding: 11px 18px; border-radius: 8px; border: 1px solid var(--line); text-decoration: none; color: var(--text); }
a.button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.app-offer { margin: 18px 0 0; padding: 12px 16px; border: 1px solid var(--line); border-radius: 10px; }
.note button.link { padding: 0; font-size: inherit; text-decoration: underline; }
textarea { font: 15px/1.4 ui-monospace, "Cascadia Mono", Consolas, monospace; width: 100%; padding: 8px 10px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); resize: vertical; }
.clip { margin-top: 14px; padding-top: 6px; border-top: 1px solid var(--line); }
.clip .row { align-items: center; margin-top: 10px; }
.clip-box { display: flex; gap: 16px; padding: 10px 12px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.clip-col { flex: 1 1 320px; min-width: 0; }
.clip-col .note { margin: 0 0 6px; }
.clip-col .row { align-items: center; margin-top: 8px; }
.check-row { display: flex; gap: 8px; align-items: center; margin: 14px 0 0; }
.check-row input { width: 18px; height: 18px; }
.error { color: var(--danger); min-height: 1.5em; margin: 12px 0 0; }
.stats { color: var(--muted); font-size: 14px; }

/* The master's view of the client's screen takes the whole page. */
body.master main { padding: 16px; }
main > section.stage { max-width: none; padding: 0; display: flex; flex-direction: column; align-self: stretch; overflow: hidden; }
.bar { display: flex; align-items: center; gap: 16px; padding: 8px 12px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.bar .grow { flex: 1; }
.bar button { padding: 6px 12px; font-size: 15px; }
.screen { flex: 1; min-height: 0; background: #000; display: flex; align-items: center; justify-content: center; }
.screen canvas { max-width: 100%; max-height: 100%; object-fit: contain; }
.screen:fullscreen canvas { width: 100%; height: 100%; }