:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1c1f24;
  --muted: #5f6672;
  --line: #d9dde3;
  --accent: #2f6fed;
  --accent-text: #ffffff;
  --danger: #c93a3a;
  --ok: #1f8a4c;
  --warn-bg: #fff4d6;
  --warn-text: #6b4e00;
  --video-bg: #000000;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171b;
    --panel: #1e2126;
    --text: #e6e8eb;
    --muted: #9aa1ac;
    --line: #333841;
    --accent: #5b8cff;
    --accent-text: #0b0d10;
    --danger: #ff6b6b;
    --ok: #4cc17f;
    --warn-bg: #3a3017;
    --warn-text: #f3d98b;
  }
}

* { box-sizing: border-box; }

/* display を指定したクラスより hidden 属性を優先する（.overlay などが消えなくなるため） */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 system-ui, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
}

h1 { font-size: 18px; margin: 0; }
h2 { font-size: 15px; margin: 0 0 8px; }

button, input, select {
  font: inherit;
  color: inherit;
}

button {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
button.danger { color: var(--danger); }
button.on { background: var(--ok); border-color: var(--ok); color: #fff; }
button:disabled { opacity: .5; cursor: default; }

input, select {
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 6px;
  padding: 5px 8px;
  min-width: 0;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.topbar .spacer { flex: 1; }
.status { color: var(--muted); font-size: 13px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
}

.row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.stack > * + * { margin-top: 8px; }
.muted { color: var(--muted); font-size: 13px; }
.warn { background: var(--warn-bg); color: var(--warn-text); border-radius: 6px; padding: 8px 10px; font-size: 13px; }
.error { color: var(--danger); }

ul.list { list-style: none; margin: 0; padding: 0; }
ul.list li {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 0; border-top: 1px solid var(--line);
}
ul.list li:first-child { border-top: 0; }
ul.list li .grow { flex: 1; min-width: 0; overflow-wrap: anywhere; }

dl.stats {
  display: grid; grid-template-columns: max-content 1fr; gap: 2px 12px;
  margin: 0; font-size: 13px; font-variant-numeric: tabular-nums;
}
dl.stats dt { color: var(--muted); }
dl.stats dd { margin: 0; overflow-wrap: anywhere; }

/* チャット */
.chat { display: flex; flex-direction: column; min-height: 0; }
.chat .log { flex: 1; overflow-y: auto; min-height: 120px; font-size: 14px; }
.chat .log p { margin: 0 0 4px; overflow-wrap: anywhere; }
.chat .log .who { font-weight: 600; margin-right: 6px; }
.chat .log .time { color: var(--muted); font-size: 12px; margin-right: 6px; }
.chat form { display: flex; gap: 6px; margin-top: 8px; }
.chat form input { flex: 1; }

/* ホスト */
.host-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 12px;
  padding: 12px 16px;
}
.host-grid .chat { height: 360px; }
.host-note { margin: 12px 16px 0; }
.log-pre {
  margin: 0; max-height: 220px; overflow-y: auto;
  font: 12px/1.5 ui-monospace, Consolas, monospace; white-space: pre-wrap; overflow-wrap: anywhere;
  color: var(--muted);
}

/* 視聴者 */
.viewer {
  display: grid;
  grid-template-columns: 1fr 320px;
  height: calc(100vh - 53px);
}
.stage { position: relative; background: var(--video-bg); min-height: 0; }
.stage video { width: 100%; height: 100%; object-fit: contain; display: block; }
.stage .overlay {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #fff; text-align: center; padding: 16px;
}
.side { display: flex; flex-direction: column; gap: 10px; padding: 10px; border-left: 1px solid var(--line); background: var(--panel); min-height: 0; }
.side .chat { flex: 1; }

.center { max-width: 420px; margin: 12vh auto; padding: 0 16px; }

@media (max-width: 760px) {
  .viewer { grid-template-columns: 1fr; height: auto; }
  .stage { aspect-ratio: 16 / 9; }
  .side { border-left: 0; }
  .side .chat { height: 320px; flex: none; }
}