:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --primary: #2563eb;
  --primary-text: #ffffff;
  --danger: #dc2626;
  --ok: #16a34a;
  --warn: #d97706;
  --track: #e2e8f0;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 4px 16px rgba(15, 23, 42, 0.05);
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0b1120;
  --card: #141c2f;
  --text: #e5e9f2;
  --muted: #94a3b8;
  --line: #243049;
  --primary: #3b82f6;
  --track: #243049;
  --shadow: none;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1120;
    --card: #141c2f;
    --text: #e5e9f2;
    --muted: #94a3b8;
    --line: #243049;
    --primary: #3b82f6;
    --track: #243049;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  padding-bottom: env(safe-area-inset-bottom);
}
[hidden] { display: none !important; }
h1, h2 { margin: 0; }
h2 { font-size: 1.1rem; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 10px 14px; padding-top: calc(10px + env(safe-area-inset-top));
  background: var(--card); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; min-width: 0; }
.brand h1 { font-size: 1.2rem; }
.top-actions { display: flex; align-items: center; gap: 6px; }

.container { max-width: 720px; margin: 0 auto; padding: 14px; display: flex; flex-direction: column; gap: 14px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 16px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 12px; min-width: 0;
}
#viewRoom { display: flex; flex-direction: column; gap: 14px; }

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.center { text-align: center; }
.hint { color: var(--muted); font-size: 0.82rem; margin: 0; }
.row { display: flex; align-items: center; }
.row.between { justify-content: space-between; gap: 8px; }
.row.wrap { flex-wrap: wrap; }
.row.gap { gap: 8px; }
.row.end { justify-content: flex-end; }

.field { display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; color: var(--muted); }
.field.inline { flex-direction: row; align-items: center; gap: 10px; }
.field.inline input { flex: 1; min-width: 0; }
input[type="text"], input[type="url"], textarea {
  width: 100%; padding: 12px 12px; font-size: 1rem; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px; outline: none; font-family: inherit;
}
input:focus, textarea:focus { border-color: var(--primary); }
textarea { resize: vertical; }

.btn {
  appearance: none; border: 1px solid var(--line); background: var(--card); color: var(--text);
  padding: 11px 16px; border-radius: 10px; font-size: 1rem; cursor: pointer; font-family: inherit;
  min-height: 44px; touch-action: manipulation;
}
.btn:hover { border-color: var(--primary); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.ghost { background: transparent; }
.btn.small { padding: 6px 12px; font-size: 0.9rem; min-height: 36px; }
.btn.block { width: 100%; }
.icon-btn { appearance: none; border: 0; background: transparent; font-size: 1.3rem; cursor: pointer; padding: 6px; min-width: 40px; min-height: 40px; }

.divider { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 0.85rem; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.pill { font-size: 0.78rem; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); white-space: nowrap; }
.pill-on { color: var(--ok); border-color: var(--ok); }
.pill-off { color: var(--muted); }
.pill-warn { color: var(--warn); border-color: var(--warn); }
.badge { font-size: 0.8rem; background: var(--primary); color: #fff; border-radius: 999px; padding: 1px 8px; vertical-align: middle; }

.banner { padding: 12px 14px; border-radius: 12px; background: #fef3c7; color: #78350f; border: 1px solid #fcd34d; font-size: 0.92rem; }
.banner.error { background: #fee2e2; color: #7f1d1d; border-color: #fca5a5; }
:root[data-theme="dark"] .banner { background: #3b2a08; color: #fde68a; border-color: #854d0e; }
:root[data-theme="dark"] .banner.error { background: #3b0d0d; color: #fecaca; border-color: #7f1d1d; }

.room-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.room-code { font-size: 1.8rem; font-weight: 700; letter-spacing: 0.15em; font-variant-numeric: tabular-nums; word-break: break-all; }

.peer-list, .xfer-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.peer {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border: 2px solid var(--line); border-radius: 12px; cursor: pointer; min-width: 0; touch-action: manipulation;
}
.peer.selected { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 8%, transparent); }
.peer.dragover { border-color: var(--ok); }
.peer .avatar { font-size: 1.6rem; flex: none; }
.peer .info { flex: 1; min-width: 0; }
.peer .name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.peer .state { font-size: 0.82rem; color: var(--muted); }
.peer .state.ok { color: var(--ok); }
.peer .state.bad { color: var(--danger); }

.dropzone {
  border: 2px dashed var(--line); border-radius: 14px; padding: 22px 12px; text-align: center; cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone.dragover, .dropzone:focus { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 6%, transparent); outline: none; }
.drop-icon { font-size: 2rem; }

.xfer { border: 1px solid var(--line); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.xfer .top { display: flex; gap: 8px; align-items: flex-start; justify-content: space-between; min-width: 0; }
.xfer .fname { font-weight: 600; word-break: break-all; min-width: 0; }
.xfer .dir { font-size: 0.78rem; color: var(--muted); }
.xfer .meta { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 0.85rem; color: var(--muted); }
.xfer .status { font-weight: 600; }
.xfer .status.ok { color: var(--ok); }
.xfer .status.bad { color: var(--danger); }
.xfer .status.run { color: var(--primary); }
.xfer .err { font-size: 0.85rem; color: var(--danger); word-break: break-word; }
.xfer .acts { display: flex; flex-wrap: wrap; gap: 8px; }
.progress { height: 8px; background: var(--track); border-radius: 999px; overflow: hidden; }
.progress > i { display: block; height: 100%; width: 0; background: var(--primary); transition: width .15s linear; }
.progress.ok > i { background: var(--ok); }
.progress.bad > i { background: var(--danger); }

dialog { border: 1px solid var(--line); border-radius: 16px; background: var(--card); color: var(--text); padding: 0; width: min(92vw, 480px); }
dialog::backdrop { background: rgba(0, 0, 0, 0.5); }
.dlg-body { display: flex; flex-direction: column; gap: 12px; padding: 16px; }

.toast {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(24px + env(safe-area-inset-bottom));
  background: #111827; color: #fff; padding: 10px 16px; border-radius: 999px; font-size: 0.92rem; z-index: 50; max-width: 90vw; text-align: center;
}

@media (min-width: 640px) {
  .container { padding: 20px; }
}