:root {
  --bg: #f4f6f6;
  --card: #ffffff;
  --text: #111;
  --muted: #4a4a4a;
  --line: #d5dada;
  --brand: #0b6e6e;
  --ok: #1b7a32;
  --ok-bg: #e3f4e7;
  --attention: #8a5a00;
  --attention-bg: #fff3d6;
  --warning: #b23c00;
  --warning-bg: #ffe6d9;
  --emergency: #b00020;
  --emergency-bg: #ffdfe3;
  --unknown-bg: #ececec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101414;
    --card: #1b2121;
    --text: #f2f2f2;
    --muted: #c4caca;
    --line: #36403f;
    --ok: #7fdc95;
    --ok-bg: #173323;
    --attention: #ffd27a;
    --attention-bg: #3a2e12;
    --warning: #ffaa80;
    --warning-bg: #3d2215;
    --emergency: #ff8a99;
    --emergency-bg: #4a1720;
    --unknown-bg: #2c3232;
  }
}

* { box-sizing: border-box; }

/* `.btn { display: block }` không được đè thuộc tính hidden (nút «Đã xong» chỉ hiện sau khi có người nhận). */
[hidden] { display: none !important; }

html { font-size: 20px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.45;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: max(1rem, env(safe-area-inset-top)) 0.8rem max(2rem, env(safe-area-inset-bottom));
}

h1 { font-size: 1.6rem; margin: 0.2rem 0 0.6rem; }
h2 { font-size: 1.15rem; margin: 0 0 0.6rem; }
p { margin: 0.3rem 0; }

.big { font-size: 1.15rem; }
.strong { font-weight: 700; }
.muted { color: var(--muted); font-size: 0.9rem; }
.error { color: var(--emergency); font-weight: 700; }
.error:empty { display: none; }

.summary {
  border-radius: 0.8rem;
  padding: 0.9rem 1rem;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}
.tone-ok { background: var(--ok-bg); color: var(--ok); }
.tone-attention { background: var(--attention-bg); color: var(--attention); }
.tone-warning { background: var(--warning-bg); color: var(--warning); }
.tone-emergency { background: var(--emergency-bg); color: var(--emergency); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 1rem;
  margin-bottom: 1rem;
}
.card.incident { border: 3px solid var(--emergency); }
.card.incident.acked { border-color: var(--warning); }

.note {
  background: var(--card);
  border-left: 0.3rem solid var(--brand);
  padding: 0.6rem 0.8rem;
  margin: 0 0 1rem;
}

.btn {
  display: block;
  width: 100%;
  min-height: 3.4rem;
  margin-top: 0.8rem;
  border: 0;
  border-radius: 0.8rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
}
.btn:disabled { opacity: 0.6; }
.btn.danger { background: #b00020; }
.btn.ok { background: #1b7a32; }
.btn.secondary { background: var(--brand); }
.btn:focus-visible { outline: 0.2rem solid var(--text); outline-offset: 0.2rem; }

.list { list-style: none; margin: 0; padding: 0; }
.list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0;
  border-top: 1px solid var(--line);
}
.list li:first-child { border-top: 0; }
.list .empty { color: var(--muted); justify-content: flex-start; }

.chip {
  flex-shrink: 0;
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  font-size: 0.85rem;
  font-weight: 700;
}
.chip.ok { background: var(--ok-bg); color: var(--ok); }
.chip.pending { background: var(--attention-bg); color: var(--attention); }
.chip.bad { background: var(--warning-bg); color: var(--warning); }
.chip.unknown { background: var(--unknown-bg); color: var(--muted); }

.timeline li { display: block; }
.timeline time { display: block; color: var(--muted); font-size: 0.85rem; }

footer { text-align: center; }