:root{
  --bg:#f7f7f5;--paper:#ffffff;--ink:#1c2430;--muted:#5d6975;--line:#e3e6ea;
  --brand:#1f5f8b;--brand-ink:#ffffff;--accent:#c8562e;--soft:#eef4f9;--ok:#1d7a4f;
  --radius:12px;--maxw:760px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Noto Sans JP","Hiragino Sans","Yu Gothic UI",system-ui,sans-serif;font-size:16px;line-height:1.8}
a{color:var(--brand)}
a:hover{color:#164567}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 16px}

/* header */
.site-header{background:var(--paper);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{font-weight:700;letter-spacing:.02em;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px}
.logo .mark{width:26px;height:26px;border-radius:7px;background:var(--brand);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:800}
.site-header nav a{font-size:14px;text-decoration:none;color:var(--muted);margin-left:16px}

/* page */
main{padding:28px 0 56px}
.crumbs{font-size:12.5px;color:var(--muted);margin-bottom:12px}
.crumbs a{color:var(--muted);text-decoration:none}
h1{font-size:26px;line-height:1.45;margin:0 0 8px;letter-spacing:.01em}
.lead{color:var(--muted);margin:0 0 20px;font-size:15px}
h2{font-size:20px;margin:40px 0 12px;padding-left:12px;border-left:4px solid var(--brand);line-height:1.5}
h3{font-size:16.5px;margin:24px 0 8px}
p{margin:0 0 14px}
ul,ol{padding-left:22px}
li{margin-bottom:4px}
small,.note{font-size:13px;color:var(--muted)}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.tool{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;box-shadow:0 1px 2px rgba(0,0,0,.03)}

/* form */
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;font-size:14px;margin-bottom:6px}
.field .hint{display:block;font-weight:400;color:var(--muted);font-size:12.5px;margin-top:2px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row > *{flex:1 1 140px}
input[type=number],input[type=text],select{width:100%;height:46px;border:1px solid #cfd5db;border-radius:8px;padding:0 12px;font-size:16px;background:#fff;color:var(--ink)}
input:focus,select:focus{outline:2px solid var(--brand);outline-offset:1px;border-color:var(--brand)}
.unit{flex:0 0 auto;color:var(--muted);font-size:14px}
.seg{display:flex;gap:6px;flex-wrap:wrap}
.seg label{flex:1 1 auto;border:1px solid #cfd5db;border-radius:8px;padding:10px 12px;text-align:center;cursor:pointer;font-size:14px;background:#fff;font-weight:500}
.seg input{display:none}
.seg input:checked + span{color:var(--brand);font-weight:700}
.seg label:has(input:checked){border-color:var(--brand);background:var(--soft)}
.btn{display:inline-flex;align-items:center;justify-content:center;height:48px;padding:0 22px;border-radius:8px;border:0;background:var(--brand);color:var(--brand-ink);font-weight:700;font-size:16px;cursor:pointer;width:100%}
.btn:hover{background:#184c70}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid #cfd5db}

/* result */
.result{margin-top:18px;background:var(--soft);border:1px solid #d3e2ee;border-radius:10px;padding:18px}
.result .big{font-size:32px;font-weight:800;color:var(--brand);line-height:1.3;letter-spacing:.01em}
.result .big small{font-size:15px;color:var(--ink);font-weight:500;margin-left:4px}
.result dl{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:12px 0 0;font-size:14.5px}
.result dt{color:var(--muted)}
.result dd{margin:0;text-align:right;font-variant-numeric:tabular-nums}
.result .empty{color:var(--muted)}

/* table */
.tbl{width:100%;border-collapse:collapse;font-size:14px;background:#fff}
.tbl th,.tbl td{border:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:top}
.tbl th{background:#f0f2f4;font-weight:700}
.tbl td.num{text-align:right;font-variant-numeric:tabular-nums}
.tblwrap{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* faq */
.faq details{border-bottom:1px solid var(--line);padding:12px 0}
.faq summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";color:var(--muted);flex:0 0 auto}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:10px 0 0;color:#2b3440}

/* slots */
.slot{margin:26px 0;padding:14px;border:1px dashed #c9cfd6;border-radius:10px;background:#fff;text-align:center;color:var(--muted);font-size:13px}
.slot.aff{text-align:left}
.slot.aff .aff-title{font-weight:700;color:var(--ink);font-size:15px;margin-bottom:6px}
.aff-links{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.aff-links a{display:inline-block;padding:9px 14px;border-radius:8px;background:var(--accent);color:#fff;text-decoration:none;font-weight:700;font-size:14px}
.aff-links a.alt{background:#fff;color:var(--ink);border:1px solid #cfd5db}

/* tool list */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin-top:8px}
.tool-card{display:block;text-decoration:none;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.tool-card:hover{border-color:var(--brand)}
.tool-card .cat{font-size:12px;color:var(--muted);letter-spacing:.06em}
.tool-card .name{font-weight:700;font-size:16.5px;margin:4px 0 6px}
.tool-card .desc{font-size:13.5px;color:var(--muted);line-height:1.6}

.related{margin-top:40px}
.related ul{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.related li{margin:0}
.related a{display:inline-block;padding:8px 12px;border:1px solid var(--line);border-radius:99px;background:#fff;text-decoration:none;font-size:14px}

.site-footer{border-top:1px solid var(--line);background:var(--paper);padding:26px 0;font-size:13px;color:var(--muted)}
.site-footer .wrap{display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between}
.site-footer a{color:var(--muted);text-decoration:none;margin-right:14px}

@media (max-width:520px){
  h1{font-size:22px}
  .result .big{font-size:27px}
  .site-header nav a{margin-left:12px}
}