:root {
  --bg: #0e1015;
  --panel: #171a21;
  --panel-2: #1e222b;
  --line: #2b303b;
  --text: #e8eaef;
  --muted: #9aa3b2;
  --accent: #5ac8fa;
  --accent-2: #7bdcb5;
  --warn: #ffb454;
  --danger: #ff6b6b;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang TC", "Noto Sans TC", "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

a { color: var(--accent); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 24px 16px 64px; }

header.top {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  border-bottom: 1px solid var(--line); padding-bottom: 14px; margin-bottom: 20px;
}
header.top h1 { font-size: 20px; margin: 0; letter-spacing: .04em; }
header.top .code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--panel-2); border: 1px solid var(--line);
  padding: 2px 10px; border-radius: 6px; letter-spacing: .2em; color: var(--accent-2);
}
header.top .spacer { flex: 1; }

.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px; margin-bottom: 16px;
}
.panel h2 {
  font-size: 13px; text-transform: uppercase; letter-spacing: .12em;
  color: var(--muted); margin: 0 0 12px; font-weight: 600;
}

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 860px) { .grid { grid-template-columns: 1fr; } }

button {
  font: inherit; color: var(--text); background: var(--panel-2);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 8px 14px; cursor: pointer; transition: border-color .12s, background .12s;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: .4; cursor: not-allowed; }
button.primary { background: var(--accent); color: #06212c; border-color: var(--accent); font-weight: 600; }
button.danger { color: var(--danger); }
button.sm { padding: 4px 9px; font-size: 13px; }

input, select, textarea {
  font: inherit; color: var(--text); background: #12151b;
  border: 1px solid var(--line); border-radius: 8px; padding: 9px 11px; width: 100%;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.field { margin-bottom: 12px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

.now {
  display: flex; flex-direction: column; gap: 4px; margin-bottom: 14px;
}
.now .title { font-size: 22px; font-weight: 600; }
.now .sub { color: var(--muted); font-size: 13px; }

.timeline { display: flex; align-items: center; gap: 10px; margin: 12px 0; }
.timeline input[type=range] { flex: 1; padding: 0; }
.timeline .t { font-family: ui-monospace, Menlo, monospace; font-size: 13px; color: var(--muted); min-width: 46px; }

.vol { display: grid; grid-template-columns: 76px 1fr 44px; gap: 10px; align-items: center; margin-bottom: 8px; }
.vol span:first-child { font-size: 13px; color: var(--muted); }
.vol .val { font-family: ui-monospace, Menlo, monospace; font-size: 13px; color: var(--muted); text-align: right; }

ul.queue { list-style: none; margin: 0; padding: 0; }
ul.queue li {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 10px 0; border-bottom: 1px solid var(--line);
}
ul.queue li:last-child { border-bottom: none; }
ul.queue li.playing { background: #1a2430; margin: 0 -8px; padding: 10px 8px; border-radius: 8px; }
.q-main { flex: 1; min-width: 0; }
.q-title { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.q-meta { font-size: 12.5px; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.q-actions { display: flex; gap: 6px; flex-shrink: 0; }
.ord { font-family: ui-monospace, Menlo, monospace; color: var(--muted); width: 22px; text-align: right; padding-top: 2px; }

/* 重要狀態不能只靠顏色表示（§7）：每個狀態都帶文字與符號 */
.tag {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; padding: 1px 8px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--panel-2); color: var(--muted);
}
.tag.ok { color: var(--accent-2); border-color: #2f5a49; }
.tag.work { color: var(--accent); border-color: #245167; }
.tag.fail { color: var(--danger); border-color: #5e2b2b; }
.tag.warn { color: var(--warn); border-color: #5e4a25; }

.hint { color: var(--muted); font-size: 13px; }
.err { color: var(--danger); font-size: 13.5px; margin-top: 8px; white-space: pre-wrap; }
.ok-msg { color: var(--accent-2); font-size: 13.5px; margin-top: 8px; }

pre.diag {
  background: #0b0d12; border: 1px solid var(--line); border-radius: 8px;
  padding: 12px; overflow: auto; max-height: 340px;
  font-family: ui-monospace, Menlo, monospace; font-size: 12px; color: #b9c2d0;
}

.banner {
  border-radius: 8px; padding: 10px 14px; margin-bottom: 14px;
  border: 1px solid var(--line); background: var(--panel-2); font-size: 14px;
}
.banner.warn { border-color: #5e4a25; color: var(--warn); }
.banner.fail { border-color: #5e2b2b; color: var(--danger); }

.center { max-width: 420px; margin: 12vh auto; }
.center h1 { font-size: 24px; margin-bottom: 4px; }
.center .hint { margin-bottom: 24px; }
.dim { color: var(--muted); }

/* 手機入口的 QR。一律白底，深色主題上反白的 QR 很多掃描器讀不到。 */
.qr-row { display: flex; gap: 18px; align-items: flex-start; flex-wrap: wrap; }
.qr-box { background: #fff; padding: 10px; border-radius: 10px; line-height: 0; flex-shrink: 0; }
.qr-side { flex: 1; min-width: 260px; }
@media (max-width: 640px) { .qr-side { min-width: 100%; } }

/* QR 區塊用 <details>：剛開包廂時要顯眼，大家都進來之後可以收起來 */
details.panel > summary {
  font-size: 13px; text-transform: uppercase; letter-spacing: .12em;
  color: var(--muted); font-weight: 600; cursor: pointer; list-style: none;
}
details.panel > summary::-webkit-details-marker { display: none; }
details.panel > summary::before { content: '▸ '; }
details.panel[open] > summary { margin-bottom: 12px; }
details.panel[open] > summary::before { content: '▾ '; }