:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #16181d;
  --muted: #5f6673;
  --primary: #1a1a2e;
  --on-primary: #ffffff;
  --line: #dde0e6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1016;
    --card: #1a1a2e;
    --text: #eef0f4;
    --muted: #a3a9b6;
    --primary: #eef0f4;
    --on-primary: #1a1a2e;
    --line: #2d2f45;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 400px;
  padding: 32px 24px;
  border-radius: 16px;
  background: var(--card);
  text-align: center;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.logo { border-radius: 16px; }
h1 { margin: 16px 0 8px; font-size: 24px; }
.muted { color: var(--muted); line-height: 1.5; }
.small { font-size: 13px; }

.code-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 20px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
}
.code-box[hidden] { display: none; }
.label { font-size: 13px; color: var(--muted); }
.code { font-size: 28px; letter-spacing: 6px; font-variant-numeric: tabular-nums; }

.btn {
  display: block;
  width: 100%;
  margin: 8px 0;
  padding: 14px 16px;
  border: 1px solid var(--primary);
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.btn.primary { background: var(--primary); color: var(--on-primary); }
.btn.secondary { background: transparent; color: var(--text); border-color: var(--line); }
.code-box .btn { width: auto; margin: 0; padding: 8px 16px; font-size: 14px; }

.stores { display: flex; gap: 8px; }
.stores .btn { flex: 1; }

footer { margin-top: 16px; font-size: 13px; }
footer a { color: var(--muted); }