:root{
  --bg:#f6f7fb;
  --panel:#ffffff;
  --ink:#0f172a;
  --muted:#64748b;
  --line:#e5e7eb;
  --accent:#2563eb;
  --accent-2:#16a34a;
  --warn:#d97706;
  --danger:#dc2626;
  --radius:14px;
  --shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px -12px rgba(15,23,42,.18);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%,#dbeafe 0%,transparent 60%),
    radial-gradient(1000px 500px at 110% 10%,#dcfce7 0%,transparent 55%),
    var(--bg);
  line-height:1.55;
}
.site-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:18px clamp(16px,4vw,48px);
  background:rgba(255,255,255,.7);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:10;
}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:34px;height:34px;border-radius:8px;box-shadow:var(--shadow)}
.brand-name{font-weight:700;font-size:18px;letter-spacing:-.01em}
.brand-sub{color:var(--muted);font-size:12px}
.site-nav{display:flex;gap:18px;flex-wrap:wrap}
.site-nav a{color:var(--ink);text-decoration:none;font-size:14px}
.site-nav a:hover{color:var(--accent)}
main{max-width:1180px;margin:0 auto;padding:clamp(16px,3vw,36px)}
.section{margin-bottom:44px}
.h1{font-size:clamp(26px,3.4vw,38px);line-height:1.15;margin:0 0 8px;letter-spacing:-.02em}
.h2{font-size:22px;margin:0 0 10px}
.h3{font-size:17px;margin:0 0 8px}
.lede{color:var(--muted);max-width:64ch;margin:0 0 20px}
.ws{display:grid;grid-template-columns:260px 1fr;gap:22px}
@media (max-width:880px){.ws{grid-template-columns:1fr}}
.ws-side{position:sticky;top:80px;align-self:start;display:flex;flex-direction:column;gap:14px}
.steps{margin:0;padding-left:18px;font-size:14px;color:var(--muted)}
.steps li{margin:4px 0}
.presets{display:flex;flex-direction:column;gap:8px}
.btn{
  appearance:none;border:0;border-radius:10px;padding:10px 14px;
  background:var(--accent);color:#fff;font-weight:600;cursor:pointer;
  box-shadow:var(--shadow);
}
.btn:hover{filter:brightness(1.05)}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent)}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;margin-bottom:16px;box-shadow:var(--shadow);
}
.card legend{font-weight:700;padding:0 6px}
.hint{color:var(--muted);font-size:13px;margin:4px 0 12px}
.field{display:flex;flex-direction:column;gap:6px;margin:8px 0}
.field span{font-size:13px;color:var(--muted)}
input,select{
  appearance:none;border:1px solid var(--line);border-radius:10px;
  padding:10px 12px;font-size:15px;background:#fff;color:var(--ink);
  transition:border-color .15s;
}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.rows{display:flex;flex-direction:column;gap:10px}
.row{display:grid;gap:10px;align-items:center;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:10px}
.row .rm{justify-self:end;background:transparent;border:0;color:var(--danger);cursor:pointer;font-size:16px}
.row .rm:hover{color:#991b1b}
.row.room{grid-template-columns:1fr 120px 40px}
.row.person{grid-template-columns:1fr 1fr 100px 100px 40px}
.row.bill{grid-template-columns:1fr 140px 120px 40px}
.row.factor{grid-template-columns:1fr 120px}
.result-actions{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0 18px}
.summary{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.person-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.person-card h3{margin:0 0 6px;display:flex;justify-content:space-between;align-items:center}
.person-card .total{font-size:22px;font-weight:700;color:var(--accent)}
.person-card ul{margin:4px 0 0;padding-left:18px;font-size:14px}
.person-card li{margin:2px 0}
.bar{height:6px;background:#e5e7eb;border-radius:999px;overflow:hidden;margin-top:6px}
.bar > span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.table-wrap{overflow-x:auto}
.table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.table th,.table td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
.table thead{background:#f8fafc}
.table tfoot td{font-weight:700}
.up{color:var(--danger)}
.down{color:var(--accent-2)}
.guide-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-bottom:22px}
.list{margin:0;padding-left:18px}
.list li{margin:4px 0}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:12px 16px;margin-bottom:8px;box-shadow:var(--shadow)}
.faq summary{font-weight:600;cursor:pointer}
.faq p{margin:8px 0 0;color:var(--muted);font-size:14px}
.muted{color:var(--muted)}
.small{font-size:12px}
.history{margin-top:22px}
.history .hint{margin-bottom:8px}
.site-foot{max-width:1180px;margin:0 auto;padding:20px clamp(16px,4vw,48px);border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:13px}
.site-foot a{color:var(--muted);text-decoration:none;margin-left:14px}
.site-foot a:hover{color:var(--accent)}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}