:root {
  --bg: #f5f6fa; --card: #ffffff; --text: #151a2d; --muted: #5d6479; --line: #e3e6ef;
  --accent: #4f46e5; --accent-text: #ffffff; --code: #eef0f6; --err: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1220; --card: #181c2e; --text: #eceef6; --muted: #9aa1b8; --line: #2a2f45;
          --accent: #818cf8; --accent-text: #0f1220; --code: #22273c; --err: #fda29b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
[hidden] { display: none !important; }
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 56px; }
h1 { font-size: 1.75rem; margin: 0 0 4px; }
.sub { color: var(--muted); margin: 0 0 28px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h2 { font-size: 1.15rem; margin: 0 0 4px; }
.card p { color: var(--muted); margin: 0 0 16px; font-size: .95rem; }
form.card { display: grid; gap: 10px; max-width: 420px; }
label { font-weight: 600; }
input { font: inherit; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px;
        background: var(--bg); color: var(--text); }
button, .btn { display: block; text-align: center; background: var(--accent); color: var(--accent-text);
               text-decoration: none; font: inherit; font-weight: 600; padding: 12px 16px;
               border: 0; border-radius: 10px; cursor: pointer; }
button:disabled { opacity: .6; }
button:focus-visible, .btn:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.err { color: var(--err); margin: 0; font-size: .9rem; }
.apps { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.meta { margin-top: 12px; font-size: .8rem; color: var(--muted); }
.meta code { display: block; background: var(--code); padding: 6px 8px; border-radius: 6px;
             word-break: break-all; margin-top: 4px; font-size: .72rem; }
.steps { margin-top: 24px; }
.steps h2 { font-size: 1.1rem; margin: 0 0 8px; }
ol { margin: 0; padding-left: 20px; } li { margin: 6px 0; }
.note { margin-top: 16px; font-size: .85rem; }