:root {
  --ink: #061b31;
  --muted: #64748d;
  --line: #e5edf5;
  --bg: #fbfcff;
  --paper: #fff;
  --purple: #533afd;
  --mag: #f96bee;
  --shadow: rgba(50, 50, 93, .16) 0 26px 45px -34px;
}

html[data-theme="dark"] {
  --ink: #f8fbff;
  --muted: #a8b5d4;
  --line: rgba(214, 217, 252, .18);
  --bg: #070a16;
  --paper: #111936;
}

* {
  box-sizing: border-box;
}

body {
  max-width: 920px;
  margin: 0 auto;
  padding: 42px 22px;
  line-height: 1.65;
  color: var(--ink);
  background: radial-gradient(circle at 10% 0, rgba(83, 58, 253, .14), transparent 30%), var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Noto Sans JP", Arial, sans-serif;
}

a {
  color: var(--purple);
}

button {
  font: inherit;
}

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

.top {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.actions,
.lang {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.lang {
  gap: 4px;
}

.lang button,
.theme {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 8px;
  padding: 7px 9px;
  font-weight: 700;
  cursor: pointer;
}

.lang-code {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 11px;
  letter-spacing: .08em;
}

.lang button.active {
  background: var(--purple);
  color: #fff;
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  margin: 18px 0;
  box-shadow: var(--shadow);
}

h1 {
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.08;
  font-weight: 300;
  letter-spacing: 0;
}

h2 {
  margin-top: 0;
}

.muted {
  color: var(--muted);
}

li {
  margin: 10px 0;
}

.qr {
  display: block;
  width: min(100%, 280px);
  max-width: 280px;
  height: auto;
  background: #fff;
  padding: 18px;
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: rgba(50, 50, 93, .20) 0 28px 45px -32px;
}