:root {
  --paper: #f6f3ee;
  --ink: #161616;
  --muted: #6f6a63;
  --accent: #dd4132;
  --line: rgba(22, 22, 22, .14);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body.ar {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Helvetica Neue", "PingFang HK", "Noto Sans HK", "Microsoft JhengHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

.frame {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100svh;
  padding: clamp(20px, 4vw, 56px);
}

.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: clamp(13px, 1.5vw, 16px);
  font-weight: 600;
  letter-spacing: .04em;
}

.brand span {
  display: inline-block;
  margin-left: .6em;
  color: var(--muted);
  font-size: .72em;
  font-weight: 500;
  letter-spacing: .16em;
}

.tag {
  color: var(--muted);
  font-size: clamp(10px, 1.1vw, 12px);
  letter-spacing: .22em;
  white-space: nowrap;
}

main {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(28px, 6vh, 72px) 0;
}

.num {
  margin: 0 0 clamp(12px, 2vh, 24px);
  color: var(--accent);
  font-size: clamp(14px, 1.6vw, 18px);
  font-weight: 600;
  letter-spacing: .3em;
}

h1 {
  margin: 0;
  font-size: clamp(38px, 7.4vw, 96px);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: .01em;
}

.en {
  margin: clamp(16px, 2.4vh, 28px) 0 0;
  color: var(--muted);
  font-size: clamp(15px, 1.7vw, 20px);
  letter-spacing: .02em;
}

.note {
  margin: clamp(28px, 5vh, 56px) 0 0;
  max-width: 34em;
  color: var(--muted);
  font-size: clamp(12px, 1.25vw, 14px);
  line-height: 1.9;
}

.watermark {
  position: absolute;
  right: -2vw;
  bottom: -10vh;
  color: rgba(221, 65, 50, .06);
  font-size: clamp(220px, 42vw, 620px);
  font-weight: 700;
  line-height: .8;
  letter-spacing: -.06em;
  pointer-events: none;
  user-select: none;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: clamp(11px, 1.2vw, 13px);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.status i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: .25; }
  50% { opacity: 1; }
}

nav {
  display: flex;
  gap: 10px;
}

nav a {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  font-size: 12px;
  text-decoration: none;
  transition: border-color .2s, color .2s;
}

nav a:hover,
nav a.on {
  border-color: var(--accent);
  color: var(--accent);
}

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

@media (max-width: 640px) {
  .brand span { display: block; margin: .35em 0 0; }
  .tag { display: none; }
  .watermark { right: -8vw; bottom: -6vh; }
}

@media (prefers-reduced-motion: reduce) {
  .status i { animation: none; opacity: 1; }
}