:root{
  --bg:#0b1220;
  --card:#0f1a33;
  --text:#e7ecff;
  --muted:#aab5e6;
  --btn:#1e2f66;
  --btnHover:#263a7d;
  --danger:#ffcc66;
  --dangerBg:#2a210f;
  --border:rgba(231,236,255,0.10);
  --shadow:0 12px 30px rgba(0,0,0,.30);
  --radius:18px;
  --max:520px;
  --tap:56px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font);
  background:radial-gradient(1200px 800px at 20% -10%, #192a63 0%, transparent 60%),
             radial-gradient(1200px 800px at 110% 20%, #1a4c72 0%, transparent 55%),
             var(--bg);
  color:var(--text);
}
.app{min-height:100%; display:flex; flex-direction:column; align-items:center; padding:18px 14px 24px}
.topbar{width:100%; max-width:var(--max); display:flex; align-items:center; justify-content:space-between; gap:10px; padding:6px 4px 14px}
.brand__title{font-size:16px; font-weight:700; letter-spacing:.2px}
.brand__subtitle{font-size:12px; color:var(--muted); margin-top:2px}
.topbar__actions{display:flex; gap:8px}
.card{
  width:100%; max-width:var(--max);
  background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.03));
  border:1px solid var(--border);
  box-shadow:var(--shadow);
  border-radius:var(--radius);
  padding:18px;
}
.h1{font-size:18px; margin:0 0 14px; line-height:1.25}
.p{margin:0; color:var(--muted); font-size:14px; line-height:1.45}
.options{display:flex; flex-direction:column; gap:10px; margin-top:14px}
.btn{
  appearance:none;
  border:1px solid var(--border);
  background:var(--btn);
  color:var(--text);
  height:var(--tap);
  border-radius:14px;
  padding:0 14px;
  text-align:left;
  font-size:16px;
  font-weight:650;
  letter-spacing:.1px;
}
.btn:active{transform:translateY(1px)}
.btn:hover{background:var(--btnHover)}
.btn--ghost{background:transparent; height:40px; padding:0 12px; font-size:13px; color:var(--muted)}
.btn--ghost:hover{background:rgba(255,255,255,.06); color:var(--text)}
.result{display:flex; flex-direction:column; gap:12px}
.result__body{font-size:18px; font-weight:800; line-height:1.25}
.warning{
  border-radius:16px;
  border:1px solid rgba(255,204,102,.35);
  background:linear-gradient(180deg, rgba(255,204,102,.12), rgba(42,33,15,.70));
  padding:14px;
}
.warning__title{font-weight:900; margin-bottom:8px}
.ul{margin:0; padding-left:18px; color:var(--text)}
.ul li{margin:6px 0}
.footer{width:100%; max-width:var(--max); padding:14px 4px 0}
.footer__hint{font-size:12px; color:rgba(170,181,230,.75)}
@media (min-width: 700px){
  .brand__title{font-size:18px}
  .card{padding:22px}
}