:root {
  --bg: #f8fafc; --fg: #0f172a; --muted: #64748b; --card: #ffffff; --line: #e2e8f0;
  --accent: #1e3a8a; --rec: #dc2626; --ok: #15803d; --warn: #b45309;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b1220; --fg: #e2e8f0; --muted: #94a3b8; --card: #111a2e; --line: #1e293b; --accent: #93c5fd; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--fg);
  padding: env(safe-area-inset-top) 16px env(safe-area-inset-bottom); }
header { display: flex; justify-content: space-between; align-items: baseline; padding: 14px 0; }
h1 { font-size: 20px; margin: 0; color: var(--accent); }
#who { color: var(--muted); font-size: 14px; }
section { max-width: 520px; margin: 0 auto; }
label { display: block; margin: 12px 0; }
input { display: block; width: 100%; padding: 12px; margin-top: 4px; font-size: 16px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--card); color: var(--fg); }
button { font: inherit; cursor: pointer; }
.primary { width: 100%; padding: 14px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; font-weight: 600; }
nav { display: flex; gap: 8px; max-width: 520px; margin: 0 auto 8px; }
nav button { flex: 1; padding: 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--fg); }
nav button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
#tab-record { text-align: center; padding-top: 40px; }
.rec { width: 180px; height: 180px; border-radius: 50%; border: 6px solid var(--rec); background: var(--card); display: grid; place-items: center; }
.rec span { width: 70px; height: 70px; border-radius: 50%; background: var(--rec); transition: all .2s; }
.rec.on span { border-radius: 12px; width: 60px; height: 60px; }
.rec.on { animation: pulse 1.4s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 16px rgba(220, 38, 38, .15); } }
#timer { font-size: 40px; font-variant-numeric: tabular-nums; margin: 20px 0 8px; }
#timer.warn { color: var(--warn); }
.msg { color: var(--muted); }
.hint { color: var(--muted); font-size: 13px; }
#list { list-style: none; padding: 0; margin: 0; }
#list li { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin-bottom: 8px;
  display: flex; justify-content: space-between; align-items: center; gap: 8px; }
#list small { color: var(--muted); display: block; }
.st-pending { color: var(--warn); font-weight: 600; }
.st-received { color: var(--accent); font-weight: 600; }
.st-done { color: var(--ok); font-weight: 600; }
.st-error { color: var(--rec); font-weight: 600; }
.tr { margin: 6px 0 0; font-size: 14px; white-space: pre-wrap; overflow-wrap: anywhere; cursor: pointer; }
.badge { display: inline-block; min-width: 20px; padding: 0 6px; margin-left: 4px; border-radius: 10px;
  background: var(--rec); color: #fff; font-size: 12px; line-height: 20px; }
.badge.zero { background: var(--ok); }
.badge[hidden] { display: none; }
#msgs { list-style: none; padding: 0; margin: 0; }
#msgs li { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent);
  border-radius: 10px; padding: 12px; margin-bottom: 8px; transition: border-color 1s; }
#msgs li.unread { border-left-color: var(--rec); }
#msgs small { color: var(--muted); display: block; margin-bottom: 4px; }
#msgs p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.retry { padding: 8px 12px; border-radius: 8px; border: 1px solid var(--warn); background: transparent; color: var(--warn); }
.link { border: 0; background: none; color: var(--accent); padding: 0; text-decoration: underline; font-size: inherit; }