:root{
  --bg:#0b1223; --ink:#dfe7ff; --muted:#8aa1d9;
  --card:#101a33; --line:#1b2b4d; --brand:#16c964; --brand-ink:#001b0c;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,Segoe UI,Arial,sans-serif}
.wrap{max-width:960px;margin:0 auto;padding:16px}
header{position:sticky;top:0;background:#0b1223b3;border-bottom:1px solid var(--line);backdrop-filter:blur(8px);z-index:2}
h1{margin:0;font-size:22px}
main.wrap{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - 120px)}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 10px 30px rgba(0,0,0,.22);max-width:620px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 16px;border-radius:999px;border:1px solid var(--line);background:#0f1830;color:var(--ink);cursor:pointer}
.btn.primary{background:var(--brand);color:var(--brand-ink);border-color:#0e6a3b}
.note{color:var(--muted);font-size:14px;margin-top:10px}
.tip{display:none;margin-top:12px;border:1px dashed var(--line);border-radius:12px;padding:12px;color:var(--muted)}
.tip.show{display:block}
footer{padding:14px 16px;border-top:1px solid var(--line)}
.toast{position:fixed;right:16px;bottom:16px;background:#0f1830;border:1px solid var(--line);padding:12px 14px;border-radius:12px;display:none}
.toast.show{display:block}