:root {
  --bg: #f7f7f8;
  --surface: #ffffff;
  --text: #111113;
  --muted: #5f5f68;
  --border: #e4e4e8;
  --accent: #1f5fd6;
  --primary: #111113;
  --on-primary: #ffffff;
  /* Severity fills carry white text at >= 5:1 contrast (WCAG AA). */
  --extreme: #c4161c;
  --severe: #b3530a;
  --moderate: #8a6500;
  --info: #1f7a4d;
  --unverified: #5b5b63;
  --expired: #45454c;
  --ok: #1f9d55;
  --warn: #c27c0e;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(16, 16, 20, 0.04), 0 8px 24px rgba(16, 16, 20, 0.06);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans CJK SC", sans-serif;
  color-scheme: light dark;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0d;
    --surface: #16161a;
    --text: #f2f2f4;
    --muted: #a1a1aa;
    --border: #26262c;
    --accent: #6c9cff;
    --primary: #f2f2f4;
    --on-primary: #0b0b0d;
    --shadow: none;
  }
  button.outline-danger, .rx-911 { color: #ff7a7a; }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}

h1 { font-size: 1.4rem; margin: 0 0 4px; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; margin: 24px 0 8px; color: var(--muted); }

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 12px 0;
}

button, select, input, textarea {
  font: inherit;
  color: inherit;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform 80ms ease, opacity 120ms ease, background 120ms ease;
}
button:active { transform: scale(0.985); }
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
button.danger { background: var(--extreme); }
button.primary { background: var(--primary); color: var(--on-primary); }
button.outline-danger { background: transparent; color: var(--extreme); border: 1.5px solid currentColor; }
button.big { width: 100%; padding: 18px; font-size: 1.15rem; }
button:disabled { opacity: 0.5; cursor: default; }

select, input, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

label { display: block; font-size: 0.85rem; color: var(--muted); margin: 10px 0 4px; }

.row { display: flex; gap: 10px; flex-wrap: wrap; }
.row > * { flex: 1 1 140px; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* ---- Alert card (receiver, and the console's phone preview) ---- */
.alert {
  border-radius: var(--radius);
  padding: 22px;
  color: #fff;
  margin: 12px 0;
  box-shadow: var(--shadow);
}
.alert.extreme { background: var(--extreme); }
.alert.severe { background: var(--severe); }
.alert.moderate { background: var(--moderate); }
.alert.info { background: var(--info); }
.alert.unverified { background: var(--unverified); outline: 2px dashed rgba(255, 255, 255, 0.85); outline-offset: -8px; }
/* Expired: solid grey, not faded, so the text keeps its contrast. */
.alert.expired { background: var(--expired); }
.alert.expired .title, .alert.expired .detail { text-decoration: line-through; text-decoration-thickness: 2px; text-decoration-color: rgba(255, 255, 255, 0.6); }
.alert.away { opacity: 0.85; }
.alert .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  margin-bottom: 14px;
}
.alert .badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.alert .badge.verified { background: #fff; color: #14532d; }
.alert .zone { font-size: 0.9rem; font-weight: 600; opacity: 0.85; letter-spacing: 0.01em; }
.alert .title { font-size: 1.75rem; font-weight: 800; line-height: 1.12; letter-spacing: -0.015em; margin-top: 4px; }
.alert .detail { font-size: 1.15rem; margin-top: 8px; opacity: 0.95; }
.alert .meta { margin-top: 18px; padding-top: 12px; border-top: 1px solid rgba(255, 255, 255, 0.2); font-size: 0.85rem; opacity: 0.85; }
.alert .warn { margin-top: 6px; font-size: 0.8rem; font-weight: 600; opacity: 0.85; }
.alert .meta:empty { display: none; }

/* Compact history row: neutral surface, severity as a left rule. */
.alert.compact {
  --sev: var(--muted);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: inset 4px 0 0 var(--sev);
  outline: none;
  padding: 14px 16px;
  margin: 8px 0;
}
.alert.compact.extreme { --sev: var(--extreme); }
.alert.compact.severe { --sev: var(--severe); }
.alert.compact.moderate { --sev: var(--moderate); }
.alert.compact.info { --sev: var(--info); }
.alert.compact.unverified { border: 1.5px dashed var(--muted); box-shadow: none; }
.alert.compact.expired .title, .alert.compact.expired .detail { text-decoration-color: currentColor; color: var(--muted); }
.alert.compact .badge { background: transparent; color: var(--sev); padding: 0; margin-bottom: 6px; font-size: 0.68rem; }
.alert.compact .zone { font-size: 0.82rem; color: var(--muted); opacity: 1; }
.alert.compact .title { font-size: 1.02rem; font-weight: 700; margin-top: 2px; }
.alert.compact .detail { font-size: 0.92rem; margin-top: 2px; color: var(--muted); opacity: 1; }
.alert.compact .meta { margin-top: 8px; padding-top: 0; border: 0; font-size: 0.78rem; color: var(--muted); opacity: 1; }
.alert.compact .warn { display: none; }

.level {
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  overflow: hidden;
  margin-top: 12px;
}
.level > div { height: 100%; width: 0; background: var(--ok); transition: width 80ms; }

.history-item { padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 0.95rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 6px 4px; border-bottom: 1px solid var(--border); vertical-align: top; }

code { font-size: 0.8rem; word-break: break-all; }
.hidden { display: none !important; }

/* Screen-reader-only live region */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* Visual alarm for deaf and hard-of-hearing users: 3 flashes in 2 s (under the 3/s seizure limit) */
#flash { position: fixed; inset: 0; pointer-events: none; background: #fff; opacity: 0; z-index: 10; }
#flash.on { animation: chirp-flash 2s steps(1, end); }
@keyframes chirp-flash {
  0%, 33%, 66% { opacity: 0.85; }
  16%, 50%, 83%, 100% { opacity: 0; }
}

/* ---- Receiver page ---- */
.rx main { max-width: 560px; padding: max(16px, env(safe-area-inset-top)) 16px 40px; }

.rx-top { display: flex; align-items: center; gap: 10px; padding: 4px 0 10px; }
.rx-brand { display: flex; align-items: center; gap: 8px; margin-right: auto; }
.rx-mark {
  width: 22px; height: 22px; border-radius: 7px; background: var(--extreme);
  box-shadow: inset 0 0 0 5px var(--extreme), inset 0 0 0 7px #fff;
}
.rx-word { font-weight: 800; font-size: 1.05rem; letter-spacing: 0.12em; }
.rx-status { display: flex; align-items: center; gap: 6px; }
.rx-clock { display: none; }
.rx-top select { width: auto; max-width: 140px; padding: 7px 30px 7px 12px; border-radius: 999px; font-size: 0.85rem; }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 0.75rem; font-weight: 600; color: var(--muted); white-space: nowrap;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); }
.pill.off .dot { background: var(--warn); }

.rx-note { margin: 2px 0 16px; font-size: 0.78rem; color: var(--muted); line-height: 1.45; }
.rx-banner {
  margin: 0 0 16px; padding: 12px 14px; border-radius: 12px; font-size: 0.85rem; font-weight: 600;
  background: color-mix(in srgb, var(--warn) 14%, var(--surface)); border: 1px solid color-mix(in srgb, var(--warn) 40%, transparent);
}

.rx-listen {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; box-shadow: var(--shadow);
}
.rx-listen button.big { border-radius: 12px; font-size: 1.05rem; padding: 16px; }
.rx-listening { display: flex; align-items: center; gap: 12px; padding: 4px 2px; font-weight: 600; font-size: 0.95rem; }
.pulse { position: relative; flex: 0 0 auto; width: 10px; height: 10px; border-radius: 50%; background: var(--ok); }
.pulse::after {
  content: ""; position: absolute; inset: -6px; border-radius: 50%;
  border: 2px solid var(--ok); opacity: 0; animation: chirp-pulse 1.8s ease-out infinite;
}
@keyframes chirp-pulse { 0% { transform: scale(0.5); opacity: 0.8; } 100% { transform: scale(1.6); opacity: 0; } }

.rx #current .alert { margin-top: 16px; }
.rx #silence { margin-top: 16px; }

.rx-actions { display: flex; gap: 10px; margin-top: 12px; }
.rx-actions > * { flex: 1; }
.rx-actions button { width: 100%; padding: 14px; }
.rx #help-form { margin-top: 10px; }
.rx #help-form .big { margin-top: 14px; }
.check { display: flex; align-items: center; gap: 10px; color: var(--text); font-size: 0.95rem; margin: 12px 0 0; }
.check input { width: 20px; height: 20px; margin: 0; accent-color: var(--extreme); }
.rx-911 { font-weight: 700; color: var(--extreme); margin: 12px 0 0; }
.rx #help-status:empty { display: none; }

.rx-label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 32px 0 4px; }
.rx-empty { padding: 18px 0; color: var(--muted); font-size: 0.9rem; border-top: 1px solid var(--border); }

@media (prefers-reduced-motion: reduce) {
  #flash.on { animation: chirp-fade 1.5s ease-out; }
  @keyframes chirp-fade { from { opacity: 0.6; } to { opacity: 0; } }
  .pulse::after { animation: none; }
  button { transition: none; }
}

/* ---- Shelter screen (?kiosk=1): dark, full-bleed, readable across a room ---- */
body.kiosk {
  --bg: #050506; --surface: #121215; --text: #f4f4f5; --muted: #9a9aa3; --border: #232328;
  --primary: #f4f4f5; --on-primary: #050506; --shadow: none;
  background: var(--bg); color: var(--text);
}
body.kiosk main { max-width: none; min-height: 100vh; padding: 2.5vw 3.5vw; display: flex; flex-direction: column; }
body.kiosk .rx-top { padding-bottom: 1.5vw; }
body.kiosk .rx-word { font-size: clamp(1.1rem, 2vw, 2rem); }
body.kiosk .rx-mark { width: clamp(22px, 2.2vw, 36px); height: clamp(22px, 2.2vw, 36px); }
body.kiosk .pill { font-size: clamp(0.8rem, 1.2vw, 1.2rem); padding: 0.4em 0.9em; }
body.kiosk .rx-clock { display: block; font-size: clamp(1.1rem, 2.2vw, 2.4rem); font-weight: 700; font-variant-numeric: tabular-nums; margin-left: 0.8vw; }
body.kiosk .rx-top select { max-width: 220px; font-size: clamp(0.85rem, 1.2vw, 1.2rem); }
body.kiosk .rx-note { font-size: clamp(0.8rem, 1vw, 1rem); margin-bottom: 1.5vw; }
body.kiosk #actions, body.kiosk #earlier, body.kiosk #history { display: none !important; }
body.kiosk .rx-listen { background: transparent; border: 0; padding: 0; }
body.kiosk #start { font-size: clamp(1.4rem, 3vw, 3rem); padding: 3vw; border-radius: 20px; }
body.kiosk .rx-listening { justify-content: center; font-size: clamp(1.3rem, 3vw, 3rem); padding: 4vw 0 1vw; color: var(--muted); }
body.kiosk .pulse { width: clamp(14px, 1.6vw, 26px); height: clamp(14px, 1.6vw, 26px); }
body.kiosk .level { height: 6px; max-width: 40vw; margin: 1vw auto 0; }
/* Once an alert is up, the listening indicator shrinks out of the way. */
body.kiosk:has(#current .alert) .rx-listening { font-size: clamp(0.9rem, 1.3vw, 1.3rem); padding: 0; justify-content: flex-start; }
body.kiosk:has(#current .alert) .level { display: none; }
body.kiosk #silence { font-size: clamp(1.3rem, 2.6vw, 2.6rem); padding: 1.4vw; border-radius: 18px; }
body.kiosk .alert { padding: 3vw 3.5vw; border-radius: 28px; }
body.kiosk .alert .badge { font-size: clamp(0.9rem, 1.4vw, 1.5rem); padding: 0.4em 1em; margin-bottom: 1.6vw; }
body.kiosk .alert .zone { font-size: clamp(1.2rem, 2.3vw, 2.6rem); }
body.kiosk .alert .title { font-size: clamp(2.6rem, 6.6vw, 7.5rem); line-height: 1.04; margin-top: 0.6vw; }
body.kiosk .alert .detail { font-size: clamp(1.5rem, 3.4vw, 4rem); margin-top: 1vw; }
body.kiosk .alert .meta { font-size: clamp(0.95rem, 1.4vw, 1.5rem); margin-top: 2vw; padding-top: 1.2vw; }
body.kiosk .alert .warn { font-size: clamp(0.9rem, 1.3vw, 1.4rem); }
body.kiosk .alert .tr {
  display: flex; align-items: baseline; gap: 1.2vw;
  margin-top: 1.4vw; padding-top: 1.4vw; border-top: 1px solid rgba(255, 255, 255, 0.22);
  font-size: clamp(1.25rem, 2.8vw, 3.2rem); font-weight: 700; line-height: 1.2;
}
body.kiosk .alert .tr .code {
  flex: 0 0 auto; font-size: 0.5em; font-weight: 800; letter-spacing: 0.08em;
  padding: 0.3em 0.6em; border-radius: 8px; background: rgba(255, 255, 255, 0.18); transform: translateY(-0.2em);
}

/* Korean and Japanese wrap between words, not inside them. */
:lang(ko), :lang(ja) { word-break: keep-all; overflow-wrap: anywhere; }