:root{
  --bg:#f7f8fa; --card:#fff; --ink:#1c1e21; --sub:#606770;
  --line:#e4e6eb; --accent:#1a73e8; --accent-d:#1557b0;
  --ok:#0f9d58; --warn:#e37400; --bad:#d93025; --radius:12px;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Malgun Gothic","Segoe UI",Roboto,sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.65; font-size:16px;
  -webkit-text-size-adjust:100%;
}
a{color:var(--accent); text-decoration:none;}
a:hover{text-decoration:underline;}

/* header */
.site-header{
  background:#fff; border-bottom:1px solid var(--line);
  position:sticky; top:0; z-index:50;
}
.site-header .inner{
  max-width:880px; margin:0 auto; padding:14px 18px;
  display:flex; align-items:center; justify-content:space-between; gap:12px;
}
.site-logo{font-weight:800; font-size:1.15rem; letter-spacing:-.02em; color:var(--ink);}
.site-logo span{color:var(--accent);}
.site-nav{display:flex; gap:14px; font-size:.9rem; flex-wrap:wrap;}
.site-nav a{color:var(--sub);}

/* layout */
.wrap{max-width:880px; margin:0 auto; padding:24px 18px 64px;}
.breadcrumb{font-size:.82rem; color:var(--sub); margin-bottom:14px;}
.breadcrumb a{color:var(--sub);}
h1{font-size:1.6rem; line-height:1.35; margin:0 0 8px; letter-spacing:-.02em;}
.lead{color:var(--sub); font-size:.98rem; margin:0 0 22px;}

/* card */
.card{
  background:var(--card); border:1px solid var(--line);
  border-radius:var(--radius); padding:22px; margin:0 0 20px;
  box-shadow:0 1px 2px rgba(0,0,0,.03);
}
.card h2{font-size:1.15rem; margin:0 0 16px; letter-spacing:-.01em;}

/* form */
.field{margin-bottom:14px;}
.field label{display:block; font-size:.88rem; font-weight:600; margin-bottom:6px; color:#333;}
.field .hint{font-weight:400; color:var(--sub); font-size:.8rem;}
input[type=number],input[type=text],select{
  width:100%; padding:11px 13px; font-size:1rem; font-family:inherit;
  border:1px solid var(--line); border-radius:8px; background:#fff; color:var(--ink);
}
input:focus,select:focus{outline:none; border-color:var(--accent); box-shadow:0 0 0 3px rgba(26,115,232,.12);}
.row{display:flex; gap:12px;}
.row>*{flex:1; min-width:0;}
.unit-suffix{position:relative;}
.unit-suffix input{padding-right:44px;}
.unit-suffix::after{
  content:attr(data-u); position:absolute; right:13px; top:50%; transform:translateY(-50%);
  color:var(--sub); font-size:.88rem; pointer-events:none;
}

/* buttons */
.btn{
  display:inline-block; width:100%; padding:14px; font-size:1.02rem; font-weight:700;
  font-family:inherit; color:#fff; background:var(--accent); border:0; border-radius:9px;
  cursor:pointer; transition:background .15s;
}
.btn:hover{background:var(--accent-d);}
.btn.sec{background:#eef1f5; color:#333; font-weight:600;}
.btn.sec:hover{background:#e2e6ec;}

/* result */
.result{background:#f0f6ff; border:1px solid #cfe1ff; border-radius:10px; padding:18px; margin-top:18px;}
.result .big{font-size:1.75rem; font-weight:800; color:var(--accent-d); letter-spacing:-.02em; margin:2px 0;}
.result dl{display:grid; grid-template-columns:1fr 1fr; gap:10px 18px; margin:14px 0 0;}
.result dt{font-size:.82rem; color:var(--sub);}
.result dd{margin:2px 0 0; font-weight:700; font-size:1rem;}
.badge{display:inline-block; padding:3px 10px; border-radius:999px; font-size:.82rem; font-weight:700;}
.badge.under{background:#e6f4ea; color:var(--ok);}
.badge.normal{background:#e6f4ea; color:var(--ok);}
.badge.over{background:#fef7e0; color:var(--warn);}
.badge.obese{background:#fce8e6; color:var(--bad);}

/* table */
.table-wrap{overflow-x:auto; margin-top:14px;}
table{width:100%; border-collapse:collapse; font-size:.88rem;}
th,td{padding:9px 10px; border-bottom:1px solid var(--line); text-align:right; white-space:nowrap;}
th:first-child,td:first-child{text-align:left;}
thead th{background:#f7f8fa; font-weight:700; color:#333; position:sticky; top:0;}
details{margin-top:14px;}
summary{cursor:pointer; font-weight:600; color:var(--accent); padding:8px 0;}

/* content */
.content h2{font-size:1.18rem; margin:30px 0 12px; letter-spacing:-.01em;}
.content h3{font-size:1rem; margin:22px 0 8px;}
.content p{margin:0 0 14px; color:#333;}
.content ul,.content ol{margin:0 0 14px; padding-left:22px; color:#333;}
.content li{margin-bottom:6px;}
.content code{background:#f0f2f5; padding:2px 6px; border-radius:5px; font-size:.88em;}
.note{
  background:#f8f9fa; border-left:3px solid var(--accent);
  padding:12px 16px; border-radius:0 8px 8px 0; font-size:.9rem; margin:0 0 16px;
}
.warn{border-left-color:var(--warn); background:#fffbf0;}

/* hub grid */
.hub{display:grid; grid-template-columns:repeat(auto-fill,minmax(150px,1fr)); gap:12px;}
.hub a{
  display:block; background:#fff; border:1px solid var(--line); border-radius:10px;
  padding:16px 14px; color:var(--ink); text-align:center; font-weight:600; font-size:.94rem;
  transition:border-color .15s, transform .15s;
}
.hub a:hover{border-color:var(--accent); transform:translateY(-2px); text-decoration:none;}
.hub .ico{font-size:1.5rem; display:block; margin-bottom:6px;}
.hub .cat{font-size:.78rem; color:var(--sub); font-weight:400; display:block; margin-top:3px;}

/* faq */
.faq dt{font-weight:700; margin-top:16px;}
.faq dd{margin:6px 0 0; color:#333;}

/* ads */
.ad-slot{
  margin:22px 0; min-height:90px; background:#fafbfc;
  border:1px dashed #d7dbe0; border-radius:10px;
  display:flex; align-items:center; justify-content:center;
  color:#9aa0a6; font-size:.8rem; text-align:center; padding:10px;
}

/* footer */
.site-footer{
  border-top:1px solid var(--line); background:#fff; margin-top:40px;
  padding:26px 18px; font-size:.85rem; color:var(--sub);
}
.site-footer .inner{max-width:880px; margin:0 auto;}
.site-footer nav{display:flex; gap:16px; flex-wrap:wrap; margin-bottom:10px;}
.site-footer a{color:var(--sub);}
.site-footer .disc{font-size:.78rem; color:#9aa0a6; line-height:1.6;}

@media (max-width:560px){
  h1{font-size:1.35rem;}
  .row{flex-direction:column; gap:0;}
  .result dl{grid-template-columns:1fr;}
  .site-nav{gap:10px; font-size:.84rem;}
}