@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 900;
  font-display: swap;
  src: url('fonts/noto-sans-sc-900.woff2?v=e3f399e5') format('woff2');
}

:root {
  --bg: #000;
  --fg: #fff;
  --fg-dim: #9a9a9a;
  --line: #4d4d4d;
  --line-strong: #fff;
  --font: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --gap-block: clamp(2rem, 6vh, 3.5rem);
  --zh-max: 2.75rem;
  --gap-item: 1rem;
  --avatar-size: 5rem;
  --gap-line: 0.75rem;
  --fade: 0.9s;
  --pad-x: max(1.5rem, env(safe-area-inset-left), env(safe-area-inset-right));
  --pad-y: 2rem;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-weight: 900;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

.stage {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: calc(var(--pad-y) + env(safe-area-inset-top)) var(--pad-x)
           calc(var(--pad-y) + env(safe-area-inset-bottom));
}

.page {
  grid-area: 1 / 1;
  width: 100%;
  max-width: 56rem;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--fade) ease, visibility 0s linear var(--fade);
}

.page.is-active {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--fade) ease var(--fade);
}

.page-intro.is-active { transition-delay: 0s; }

.line-zh {
  margin: 0;
  font-size: min(var(--zh-max), calc((100vw - 3rem) / 16));
  font-weight: 900;
  line-height: 1.4;
  text-wrap: balance;
}

.line-en {
  margin: var(--gap-line) 0 0;
  font-size: clamp(0.9rem, 0.75rem + 0.8vw, 1.25rem);
  font-weight: 900;
  line-height: 1.5;
  color: var(--fg-dim);
  text-wrap: balance;
}

.heading { margin-bottom: var(--gap-block); }

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-item);
  text-align: left;
}

.card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 44px;
  padding: 1.25rem 1.5rem;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  color: var(--fg);
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.card-avatar {
  flex: none;
  width: var(--avatar-size);
  height: var(--avatar-size);
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  min-width: 0;
}

.card-title {
  font-size: clamp(1.15rem, 1rem + 0.8vw, 1.5rem);
  line-height: 1.4;
}

.card-tag,
.card-desc {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--fg-dim);
  word-break: keep-all;
  overflow-wrap: anywhere;
  transition: color 0.2s ease;
}

.card:hover,
.card:focus-visible {
  background: var(--fg);
  border-color: var(--line-strong);
  color: var(--bg);
}

.card:hover .card-tag,
.card:hover .card-desc,
.card:focus-visible .card-tag,
.card:focus-visible .card-desc {
  color: var(--bg);
}

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

@media (max-width: 399px) {
  :root { --avatar-size: 4rem; }
  .card {
    gap: 1rem;
    padding: 1rem;
  }
}

@media (min-width: 640px) {
  .cards { grid-template-columns: 1fr 1fr; }
  .card { padding: 1.75rem; }
  :root { --avatar-size: 5.5rem; }
}

@media (min-width: 1600px) {
  :root {
    --gap-block: 4rem;
    --zh-max: 3.25rem;
  }
  .line-en { font-size: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .page,
  .page.is-active,
  .card,
  .card-tag,
  .card-desc { transition: none; }
}