:root {
  --bg: #0e1117;
  --surface: #161b24;
  --surface-2: #1f2630;
  --text: #e8ecf2;
  --muted: #98a2b3;
  --faint: #5b6573;
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);
  --accent: #f0b429;
  --accent-bg: color-mix(in srgb, var(--accent) 14%, transparent);
  --pos: #34d399;
  --neg: #f87171;
  --grid-lived: #39424f;
  --grid-beyond: #181d26;
  --radius: 14px;
  --radius-sm: 9px;
  --serif: Georgia, "Times New Roman", serif;
  --maxw: 660px;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7f9; --surface: #ffffff; --surface-2: #eef1f5;
    --text: #161b24; --muted: #5b6573; --faint: #8b93a1;
    --border: rgba(20,25,35,.10); --border-strong: rgba(20,25,35,.18);
    --accent: #b07d10; --grid-lived: #c8ced6; --grid-beyond: #e7eaef;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.55; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; } a:hover { text-decoration: underline; }
h1, h2 { letter-spacing: -0.01em; }

.site-header { max-width: var(--maxw); margin: 0 auto; padding: 18px; }
.brand { font-size: 1.25rem; font-weight: 700; color: var(--text); display: inline-flex; align-items: center; gap: 8px; }
.brand:hover { text-decoration: none; } .brand .hg { color: var(--accent); font-size: 1.3rem; }

#main { max-width: var(--maxw); margin: 0 auto; padding: 4px 18px 48px; }
.hero { text-align: center; padding: 10px 0 22px; }
.hero h1 { font-size: 2.1rem; margin: 4px 0 8px; }
.hero p { color: var(--muted); font-size: .98rem; max-width: 30rem; margin: 0 auto; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.factors-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.fg { display: flex; flex-direction: column; gap: 5px; } .fg.full { grid-column: 1 / -1; }
label { font-size: .76rem; color: var(--muted); }
input, select { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 10px 12px; font: inherit; font-size: .9rem; }
input:focus, select:focus { outline: none; border-color: var(--accent); }
.submit-row { margin-top: 16px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.err { color: var(--neg); font-size: .82rem; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; font: inherit; font-size: .92rem; font-weight: 500; border: 1px solid var(--border-strong); background: transparent; color: var(--text); border-radius: var(--radius-sm); padding: 11px 16px; cursor: pointer; transition: background .12s; }
.btn:hover { background: var(--surface-2); }
.btn-primary { background: var(--accent); color: #1a1206; border-color: transparent; font-weight: 600; }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 88%, white); }

#result { margin-top: 22px; }
.big-result { text-align: center; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.br-label { font-size: .85rem; color: var(--muted); }
.br-age { font-family: var(--serif); font-size: 5rem; font-weight: 700; color: var(--accent); line-height: 1; margin: 4px 0; }
.br-sub { font-size: .95rem; color: var(--muted); } .br-sub b { color: var(--text); }

.grid-wrap { margin-top: 18px; text-align: center; }
.grid-legend { display: flex; justify-content: center; gap: 16px; font-size: .76rem; color: var(--muted); margin-bottom: 10px; }
.grid-legend span { display: inline-flex; align-items: center; gap: 5px; }
.sw { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }
.sw.lived { background: var(--grid-lived); } .sw.rem { background: var(--accent); } .sw.beyond { background: var(--grid-beyond); border: 1px solid var(--border); }
#grid { max-width: 100%; height: auto; image-rendering: pixelated; }
.grid-cap { font-size: .82rem; color: var(--muted); max-width: 28rem; margin: 12px auto 0; }

.section-h { font-size: 1.1rem; font-weight: 600; margin: 24px 0 10px; }
.factors-out { display: flex; flex-direction: column; gap: 7px; }
.fo { display: flex; align-items: center; justify-content: space-between; gap: 10px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 9px 13px; font-size: .88rem; }
.fo-t em { color: var(--muted); font-style: normal; }
.fo-y { font-weight: 600; font-variant-numeric: tabular-nums; }
.fo.pos .fo-y { color: var(--pos); } .fo.neg .fo-y { color: var(--neg); }
.lever { font-size: .9rem; color: var(--text); background: var(--accent-bg); border-radius: var(--radius-sm); padding: 11px 14px; margin-top: 12px; }

.actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }
.disclaimer { font-size: .76rem; color: var(--faint); text-align: center; margin-top: 18px; }

/* ---------- ad slot (reserved, no shift) ---------- */
.ad-slot {
  margin: 26px 0;
  min-height: 100px;            /* reserves space → no layout shift when the ad loads */
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  overflow: hidden;
}
.ad-slot::before {
  content: "Advertisement";
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.ad-slot .adsbygoogle { display: block; width: 100%; }
.ad-slot[data-empty] { display: none; }   /* JS hides slots AdSense didn't fill, so no orphan "Advertisement" box */

.about { margin-top: 30px; } .about h2 { font-size: 1.1rem; margin: 0 0 8px; } .about p { font-size: .9rem; color: var(--muted); margin: 0; }
.site-footer { max-width: var(--maxw); margin: 0 auto; padding: 24px 18px 40px; font-size: .76rem; color: var(--faint); text-align: center; }
.hidden { display: none; }
@media (max-width: 480px) { .form-grid, .factors-grid { grid-template-columns: 1fr; } .br-age { font-size: 4rem; } }