:root {
  --bg: #0f1117;
  --card: #181b24;
  --border: #2a2f3d;
  --text: #e8eaf0;
  --muted: #8b93a7;
  --accent: #4f8cff;
  --ok: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;
  --radius: 12px;
}
* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Sans", sans-serif;
  line-height: 1.5;
}
button, input { font: inherit; }
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 2;
  background: rgba(15, 17, 23, .94);
  backdrop-filter: blur(10px);
}
h1 { font-size: 18px; margin: 0; }
h2 { font-size: 13px; color: var(--muted); margin: 0 0 10px; font-weight: 600; }
.status {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  white-space: nowrap;
}
.status.ok { color: var(--ok); border-color: var(--ok); }
.status.warn { color: var(--warn); border-color: var(--warn); }
.status.err { color: var(--danger); border-color: var(--danger); }
main {
  max-width: 680px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.id-row { display: flex; gap: 8px; align-items: center; }
.id {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: clamp(18px, 5vw, 26px);
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--accent);
  overflow-wrap: anywhere;
}
.hint { font-size: 12px; color: var(--muted); margin: 8px 0 0; }
.qr-box { display: flex; flex-direction: column; align-items: center; gap: 8px; margin-top: 12px; }
#my-qr { width: 180px; height: 180px; background: #fff; padding: 10px; border-radius: 10px; image-rendering: pixelated; }
.qr-hint { font-size: 11px; color: var(--muted); text-align: center; margin: 0; }
button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}
button:hover { filter: brightness(1.1); }
button:focus-visible, input:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button:disabled { opacity: .5; cursor: not-allowed; }
button.sub { background: #232836; color: var(--text); }
button.compact { padding: 5px 10px; font-size: 12px; }
button.ok { background: var(--ok); color: #04281b; }
button.danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); padding: 6px 10px; }
.connect-row { display: flex; gap: 8px; }
input[type="text"] {
  flex: 1;
  min-width: 0;
  background: #0f1219;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 14px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  letter-spacing: 1px;
}
ul { list-style: none; margin: 0; padding: 0; }
#conn-list { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.conn-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #0f1219;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
}
.conn-row.selected { border-color: var(--accent); }
.conn-row .name { flex: 1; font-family: ui-monospace, Menlo, Consolas, monospace; overflow-wrap: anywhere; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); flex: none; }
#dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 26px 16px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
#dropzone.over { border-color: var(--accent); background: rgba(79, 140, 255, .08); color: var(--text); }
.pick-row { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.zip-opt { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: 12px; color: var(--muted); cursor: pointer; user-select: none; }
.zip-opt input { accent-color: var(--accent); width: 15px; height: 15px; margin: 0; flex: none; }
#send-target { margin: 10px 0 0; font-size: 12px; color: var(--muted); }
#send-target b { color: var(--text); font-family: ui-monospace, Menlo, Consolas, monospace; }
.security-note { margin: 10px 0 0; font-size: 11px; color: var(--muted); }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.section-head h2 { margin: 0; }
.diag-output { margin-top: 12px; display: flex; flex-direction: column; gap: 10px; }
.diag-empty { margin: 0; color: var(--muted); font-size: 12px; }
.diag-peer { background: #0f1219; border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; font-size: 12px; }
.diag-peer > strong { display: block; margin-bottom: 7px; font-family: ui-monospace, Menlo, Consolas, monospace; overflow-wrap: anywhere; }
.diag-row { display: grid; grid-template-columns: minmax(118px, .8fr) minmax(0, 1.2fr); gap: 10px; padding: 3px 0; }
.diag-label { color: var(--muted); }
.diag-value { text-align: right; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.diag-ok { color: var(--ok); font-weight: 600; }
.diag-warn { color: var(--warn); font-weight: 600; }
#transfer-list { display: flex; flex-direction: column; gap: 10px; }
.empty { color: var(--muted); font-size: 13px; text-align: center; padding: 6px 0; }
.transfer { background: #0f1219; border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; }
.t-head { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.t-name { flex: 1; overflow-wrap: anywhere; }
.t-size { color: var(--muted); font-size: 12px; flex: none; }
.dir { font-size: 11px; padding: 2px 8px; border-radius: 999px; flex: none; }
.dir.send { background: rgba(79,140,255,.15); color: var(--accent); }
.dir.recv { background: rgba(52,211,153,.15); color: var(--ok); }
.t-bar { height: 6px; border-radius: 3px; background: #232836; margin-top: 8px; overflow: hidden; }
.t-fill { height: 100%; width: 0%; background: var(--accent); border-radius: 3px; transition: width .15s; }
.transfer.done .t-fill { background: var(--ok); }
.transfer.failed .t-fill { background: var(--danger); }
.t-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 6px; font-size: 12px; flex-wrap: wrap; }
.t-status { color: var(--muted); }
.t-pct { color: var(--muted); font-variant-numeric: tabular-nums; margin-left: auto; }
.t-actions { display: flex; gap: 6px; }
.t-files { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
a.save-btn {
  display: inline-block;
  text-decoration: none;
  background: var(--ok);
  color: #04281b;
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
}
a.save-btn.small {
  background: #232836;
  color: var(--text);
  font-weight: 400;
  padding: 4px 10px;
  font-size: 12px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: #232836;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  max-width: 90vw;
  text-align: center;
  z-index: 10;
}
#toast.show { opacity: 1; }
@media (max-width: 520px) {
  header { padding: 12px 14px; }
  main { padding: 12px; }
  .card { padding: 14px; }
  .connect-row { flex-direction: column; }
  .conn-row { flex-wrap: wrap; }
  .conn-row .name { flex-basis: 100%; }
  .diag-row { grid-template-columns: 1fr; gap: 1px; }
  .diag-value { text-align: left; }
}