:root{
  --brand:#0F6E5C;
  --brand-ink:#0A4E42;
  --bg-soft:#F4F8F7;
  --card-bg:#FFFFFF;
  --border-soft:#E1EBE8;
  --text-main:#1B2624;
  --text-sub:#5B6B67;
  --danger-soft:#FCEFEF;
}

*{box-sizing:border-box;}

body{
  background:var(--bg-soft);
  color:var(--text-main);
  font-family:"Hiragino Sans","Yu Gothic","Noto Sans JP",sans-serif;
  line-height:1.7;
}

.site-header{
  background:var(--brand-ink);
  color:#fff;
  padding:14px 20px;
}
.header-inner{
  max-width:1080px;
  margin:0 auto;
  display:flex;
  align-items:baseline;
  gap:8px;
}
.logo-mark{font-weight:800;font-size:18px;letter-spacing:0.02em;}
.logo-sub{font-size:12px;opacity:0.85;}

.main-wrap{
  max-width:1080px;
  margin:0 auto;
  padding:20px 16px 60px;
}

.hero{padding:24px 4px 8px;}
.hero h1{
  font-size:24px;
  font-weight:800;
  color:var(--brand-ink);
  margin:0 0 10px;
}
.hero .lead{
  font-size:14.5px;
  color:var(--text-sub);
  margin:0;
}

.layout{
  display:flex;
  flex-direction:column;
  gap:24px;
  margin-top:20px;
}

.input-card{
  background:var(--card-bg);
  border:1px solid var(--border-soft);
  border-radius:16px;
  padding:20px 18px;
  box-shadow:0 2px 10px rgba(15,110,92,0.06);
  display:flex;
  flex-direction:column;
  gap:18px;
}

.field{display:flex;flex-direction:column;gap:6px;}
.field label{font-size:13.5px;font-weight:700;color:var(--text-main);}
.field input, .field select{
  font-size:16px;
  padding:12px 14px;
  border-radius:10px;
  border:1px solid var(--border-soft);
  background:#fff;
  min-height:44px;
}
.field input:focus, .field select:focus{
  outline:2px solid var(--brand);
  outline-offset:1px;
}
.note{font-size:12px;color:var(--text-sub);margin:0;}

.field-hero input{
  font-size:22px;
  font-weight:800;
  color:var(--brand-ink);
  padding:14px 16px;
}

.field-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}

.seg-label{font-size:13.5px;font-weight:700;display:block;margin-bottom:6px;}
.segment{
  display:flex;
  background:var(--bg-soft);
  border-radius:10px;
  padding:4px;
  gap:4px;
}
.seg-btn{
  flex:1;
  border:none;
  background:transparent;
  padding:10px 8px;
  font-size:14px;
  font-weight:700;
  border-radius:8px;
  min-height:44px;
  color:var(--text-sub);
  cursor:pointer;
}
.seg-btn.active{
  background:var(--brand);
  color:#fff;
}

.accordion{
  border-top:1px dashed var(--border-soft);
  padding-top:14px;
  display:flex;
  flex-direction:column;
  gap:10px;
}

.cta-btn{
  width:100%;
  min-height:52px;
  background:var(--brand);
  color:#fff;
  border:none;
  border-radius:12px;
  font-size:16px;
  font-weight:800;
  cursor:pointer;
  transition:background .15s ease;
}
.cta-btn:hover{background:var(--brand-ink);}

.empty-state{
  background:#fff;
  border:1px dashed var(--border-soft);
  border-radius:16px;
  padding:30px 20px;
  text-align:center;
  color:var(--text-sub);
  font-size:14px;
}

.result-area{
  display:flex;
  flex-direction:column;
  gap:20px;
  animation:fadeIn .4s ease;
}
@keyframes fadeIn{
  from{opacity:0;transform:translateY(8px);}
  to{opacity:1;transform:translateY(0);}
}

.result-cards{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}
.result-card{
  background:var(--card-bg);
  border:1px solid var(--border-soft);
  border-radius:16px;
  padding:18px 14px;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:4px;
  box-shadow:0 2px 10px rgba(15,110,92,0.06);
}
.result-label{font-size:12.5px;color:var(--text-sub);font-weight:700;}
.result-num{font-size:26px;font-weight:800;color:var(--brand-ink);}
.result-unit{font-size:12px;color:var(--text-sub);}

.rate-gauge-wrap{
  display:flex;
  align-items:center;
  gap:16px;
  background:var(--card-bg);
  border:1px solid var(--border-soft);
  border-radius:16px;
  padding:16px;
}
.rate-gauge{
  width:84px;
  height:84px;
  border-radius:50%;
  background:conic-gradient(var(--brand) 0deg, var(--brand) 0deg, var(--border-soft) 0deg);
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
  position:relative;
}
.rate-gauge::after{
  content:"";
  position:absolute;
  width:64px;
  height:64px;
  border-radius:50%;
  background:var(--card-bg);
}
.rate-gauge span{
  position:relative;
  z-index:1;
  font-weight:800;
  font-size:15px;
  color:var(--brand-ink);
}
.rate-text p{margin:0;font-size:13px;}
.rate-text p.rate-sub{color:var(--text-sub);font-size:12px;margin-top:2px;}

.table-wrap{
  background:var(--card-bg);
  border:1px solid var(--border-soft);
  border-radius:16px;
  overflow:hidden;
}
.breakdown-table{
  width:100%;
  border-collapse:collapse;
  font-size:13.5px;
}
.breakdown-table th{
  background:var(--brand-ink);
  color:#fff;
  padding:10px 12px;
  text-align:left;
  font-size:12.5px;
}
.breakdown-table td{
  padding:10px 12px;
  border-bottom:1px solid var(--border-soft);
}
.breakdown-table tbody tr:nth-child(even){background:var(--bg-soft);}
.breakdown-table tbody tr:hover{background:#e5f1ee;}

.disclaimer-box{
  background:#EEF3F1;
  border-radius:12px;
  padding:14px 16px;
  font-size:12px;
  color:var(--text-sub);
}

.promo-cards{
  display:flex;
  flex-direction:column;
  gap:14px;
}
.promo-card{
  background:var(--card-bg);
  border:1px solid var(--border-soft);
  border-radius:16px;
  padding:16px;
  text-align:center;
}
.promo-icon{font-size:26px;}
.promo-title{font-weight:800;font-size:14.5px;margin:8px 0 4px;}
.promo-text{font-size:12.5px;color:var(--text-sub);margin:0 0 12px;}
.promo-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 20px;
  background:var(--brand);
  color:#fff;
  border-radius:10px;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
}

.ad-slot{
  background:#E9EEEC;
  border:1px dashed #B9C7C2;
  border-radius:12px;
  padding:30px 10px;
  text-align:center;
  color:var(--text-sub);
  font-size:12.5px;
  margin-top:6px;
}

.article{
  margin-top:48px;
  padding-top:24px;
  border-top:1px solid var(--border-soft);
}
.article h2{
  font-size:17px;
  color:var(--brand-ink);
  margin:32px 0 10px;
}
.article p{font-size:14px;color:var(--text-main);}
.article a{color:var(--brand);font-weight:700;}

.faq-list{display:flex;flex-direction:column;gap:8px;}
.faq-list details{
  background:var(--card-bg);
  border:1px solid var(--border-soft);
  border-radius:10px;
  padding:12px 14px;
}
.faq-list summary{
  font-weight:700;
  font-size:14px;
  cursor:pointer;
}
.faq-list p{margin:8px 0 0;font-size:13.5px;color:var(--text-sub);}

.site-footer{
  text-align:center;
  padding:20px;
  font-size:12px;
  color:var(--text-sub);
}

@media (min-width:900px){
  .main-wrap{padding:32px 24px 80px;}
  .hero h1{font-size:28px;}
  .hero .lead{font-size:15px;max-width:720px;}
  .layout{
    flex-direction:row;
    align-items:flex-start;
    gap:48px;
  }
  .input-col{
    flex:0 0 40%;
    position:sticky;
    top:20px;
  }
  .result-col{
    flex:1;
  }
  .result-cards{grid-template-columns:1fr 1fr;}
  .result-num{font-size:32px;}
  .promo-cards{flex-direction:row;}
  .promo-card{flex:1;}
}