:root {
  color-scheme: light dark;
  word-break: normal;
  overflow-wrap: normal;
  line-break: strict;
  --page: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-quiet: #ffffff;
  --ink: #131821;
  --muted: #596577;
  --line: rgba(26, 39, 60, 0.13);
  --accent: #294ca5;
  --accent-hover: #1e3d8a;
  --focus: #1d61cf;
  --button-primary-ink: #ffffff;
  --button-secondary: rgba(255, 255, 255, 0.72);
  --button-secondary-hover: #ffffff;
  --radius-card: clamp(1.45rem, 5vw, 2.25rem);
  --radius-control: 0.85rem;
  font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0d1118;
    --surface: rgba(22, 28, 39, 0.9);
    --surface-quiet: #ffffff;
    --ink: #f4f7fb;
    --muted: #aeb9ca;
    --line: rgba(225, 232, 246, 0.16);
    --accent: #8badff;
    --accent-hover: #b9cbff;
    --focus: #a9c2ff;
    --button-primary-ink: #101826;
    --button-secondary: rgba(255, 255, 255, 0.08);
    --button-secondary-hover: rgba(255, 255, 255, 0.14);
  }
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: var(--page);
  -webkit-text-size-adjust: 100%;
}

body {
  min-width: 320px;
  min-height: 100svh;
  margin: 0;
  background:
    radial-gradient(circle at 12% 4%, rgba(73, 117, 220, 0.13), transparent 31rem),
    radial-gradient(circle at 88% 95%, rgba(110, 144, 235, 0.1), transparent 32rem),
    var(--page);
  color: var(--ink);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

img {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: max(0.75rem, env(safe-area-inset-top, 0px));
  left: max(0.75rem, env(safe-area-inset-left, 0px));
  padding: 0.7rem 0.9rem;
  border-radius: 0.7rem;
  background: var(--ink);
  color: var(--page);
  font-size: 0.94rem;
  font-weight: 650;
  text-decoration: none;
  transform: translateY(-180%);
}

.skip-link:focus { transform: none; }

main {
  display: grid;
  min-height: 100svh;
  padding:
    max(1.25rem, env(safe-area-inset-top, 0px))
    max(1.125rem, env(safe-area-inset-right, 0px))
    max(1.25rem, env(safe-area-inset-bottom, 0px))
    max(1.125rem, env(safe-area-inset-left, 0px));
  place-items: center;
}

.business-card {
  width: min(100%, 31rem);
  padding: clamp(1.25rem, 4vw, 1.8rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  text-align: center;
  backdrop-filter: blur(18px) saturate(140%);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.58rem;
  min-height: 2.75rem;
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-link img { flex: 0 0 auto; }

.card-heading { margin-top: clamp(1.1rem, 4vw, 1.5rem); }

.card-kicker {
  width: fit-content;
  margin: 0 auto 0.75rem;
  padding: 0.33rem 0.65rem;
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.04em;
}

h1 {
  max-width: none;
  margin: 0 auto;
  font-size: clamp(1.7rem, 7vw, 2.25rem);
  font-weight: 720;
  letter-spacing: -0.045em;
  line-height: 1.22;
  text-wrap: balance;
}

.copy-line {
  display: block;
  white-space: nowrap;
}

.qr-panel { margin-top: clamp(1.2rem, 4vw, 1.5rem); }

.qr-tile {
  display: block;
  width: min(100%, 15.75rem);
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid rgba(18, 24, 33, 0.1);
  border-radius: clamp(0.9rem, 3vw, 1.25rem);
  background: var(--surface-quiet);
}

.qr-tile img {
  width: 100%;
  height: auto;
  background: #ffffff;
}

.wechat-copy {
  max-width: 25rem;
  margin: 0.9rem auto 0;
  color: var(--muted);
  font-size: clamp(0.98rem, 3.8vw, 1.04rem);
  font-weight: 480;
  letter-spacing: -0.016em;
  line-height: 1.72;
  text-wrap: pretty;
}

.wechat-copy-in-app { display: none; }

.copy-unit {
  display: inline-block;
  white-space: nowrap;
}

.is-wechat-browser .wechat-copy-default { display: none; }
.is-wechat-browser .wechat-copy-in-app { display: block; }

.card-actions {
  display: grid;
  grid-template-columns: 1fr;
  width: min(100%, 15.75rem);
  gap: 0.7rem;
  margin: clamp(1.15rem, 4vw, 1.5rem) auto 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.76rem 0.85rem;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-size: 0.94rem;
  font-weight: 720;
  line-height: 1.3;
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.button-primary {
  background: var(--accent);
  color: var(--button-primary-ink);
}

.button-secondary {
  border-color: var(--line);
  background: var(--button-secondary);
  color: var(--ink);
}

@media (hover: hover) and (pointer: fine) {
  .brand-link:hover { color: var(--accent); }
  .button:hover { transform: translateY(-1px); }
  .button-primary:hover { background: var(--accent-hover); }
  .button-secondary:hover { background: var(--button-secondary-hover); }
}

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

@media (max-width: 390px) {
  main { padding-inline: max(0.75rem, env(safe-area-inset-left, 0px)); }
  .business-card { padding: 1.1rem; }
  .card-actions { grid-template-columns: 1fr; }
}

@media (horizontal-viewport-segments: 2), (spanning: single-fold-vertical) {
  main {
    width: min(100%, calc(50vw - 1.5rem));
    max-width: min(31rem, calc(50vw - 1.5rem));
    margin-inline: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}