:root {
  --bg: #f7f5f0; --fg: #1b1b1f; --muted: #6b6a73; --card: #ffffff; --line: #e4e1d9;
  --accent: #2f5bea; --accent-fg: #fff; --ok: #1f8a4c; --err: #b3261e;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121216; --fg: #ececf1; --muted: #9a99a6; --card: #1c1c22; --line: #2c2c35;
    --accent: #7c9bff; --accent-fg: #0d0d12; --ok: #5fd08f; --err: #ff8a80; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 2.4rem; margin: 0 0 4px; letter-spacing: -0.02em; }
h2 { font-size: 1.2rem; margin: 40px 0 12px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.pw { font: 600 2.6rem/1.1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.04em; margin: 6px 0 10px; }
.price { font-size: 1.8rem; font-weight: 700; margin: 4px 0 12px; }
.label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
button, .btn { font: inherit; font-weight: 600; border: 0; border-radius: 10px; padding: 10px 16px; cursor: pointer;
  background: var(--accent); color: var(--accent-fg); text-decoration: none; display: inline-block; }
button.ghost { background: transparent; color: var(--fg); border: 1px solid var(--line); }
button:disabled { opacity: 0.6; cursor: wait; }
input { font: inherit; width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--fg); }
form.row { display: flex; gap: 8px; }
form.row input { flex: 1; min-width: 0; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.88rem; }
pre { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px; overflow-x: auto; }
.token { word-break: break-all; font: 600 1rem ui-monospace, Menlo, monospace; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.msg { margin-top: 10px; min-height: 1.5em; }
.msg.err { color: var(--err); } .msg.ok { color: var(--ok); }
[hidden] { display: none !important; }
footer { margin-top: 56px; font-size: 0.85rem; color: var(--muted); }