/* 出售页通用版式（铜牌）。只改 :root 里的 token，不要在下面写一次性颜色。 */
:root {
  --c-bg: #ffffff;
  --c-ink: #111111;
  --c-mute: #6b6b6b;
  --c-copy: #454545;
  --c-hair: #e3e3e3;
  --c-invert: #ffffff;

  --ff-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Songti SC", "Noto Serif CJK SC", serif;
  --ff-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  --ff-mono: ui-monospace, SFMono-Regular, Menlo, monospace;

  --fs-host: clamp(2.4rem, 7.2vw, 5.5rem);
  --fs-copy: clamp(0.95rem, 1.05vw, 1.0625rem);
  --fs-label: 0.6875rem;

  --pad: clamp(1.5rem, 5vw, 4rem);
  --card-max: 60rem;
  --card-min-h: min(78vh, 40rem);
  --ease: cubic-bezier(.22, .61, .24, 1);
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--ff-sans);
  -webkit-font-smoothing: antialiased;
  display: grid;
  place-items: center;
  padding: var(--pad);
}

.card {
  width: min(100%, var(--card-max));
  min-height: var(--card-min-h);
  display: grid;
  grid-template-rows: auto 1fr auto;
  border: 1px solid var(--c-hair);
  padding: clamp(1.5rem, 4.5vw, 4rem);
  text-align: center;
}

.eyebrow {
  font-family: var(--ff-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.mid {
  align-self: center;
  display: grid;
  justify-items: center;
  gap: clamp(1.25rem, 3.5vh, 2rem);
}

h1 {
  margin: 0;
  font-family: var(--ff-serif);
  font-size: var(--fs-host);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

h1 .tld { color: var(--c-mute); }

.hair { width: 3rem; height: 1px; background: var(--c-ink); opacity: .85; }

.copy {
  margin: 0;
  font-size: var(--fs-copy);
  line-height: 1.8;
  color: var(--c-copy);
  max-width: 34rem;
  text-wrap: pretty;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.5rem;
  min-height: 48px;
  padding: 0.85rem 1.5rem;
  border: 1px solid var(--c-ink);
  color: var(--c-ink);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: background .25s var(--ease), color .25s var(--ease);
}

.btn:hover,
.btn:focus-visible { background: var(--c-ink); color: var(--c-invert); }
.btn:focus-visible { outline: 2px solid var(--c-ink); outline-offset: 3px; }
.btn .arrow { transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

.foot {
  font-family: var(--ff-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-mute);
}

@media (max-width: 640px) {
  .card {
    min-height: auto;
    padding: 1.75rem 1.25rem 1.5rem;
    row-gap: 1.75rem;
  }
  .mid { gap: 1.15rem; }
  .copy { max-width: 100%; }
  .btn { width: 100%; justify-content: center; }
  .foot { margin-top: 0.25rem; }
}

@media (prefers-reduced-motion: no-preference) {
  .card { animation: in .7s var(--ease) both; }
  @keyframes in { from { opacity: 0; transform: translateY(8px); } }
}