*{box-sizing:border-box;margin:0;padding:0}
:root{
  --blue:#2563EB;--blue-dark:#1D4ED8;--green:#16A34A;--green-bg:#F0FDF4;
  --text:#0F172A;--text2:#475569;--text3:#94A3B8;
  --bg:#FAFAFA;--bg2:#F1F5F9;--border:#E2E8F0;--radius:12px;
  --red:#DC2626;--orange:#EA580C;--orange-bg:#FFF7ED;
}
body{font-family:'Hiragino Sans','Yu Gothic',sans-serif;background:var(--bg);color:var(--text);min-height:100vh}
.nav{background:#fff;border-bottom:1px solid var(--border);padding:14px 24px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10}
.nav-brand{font-size:16px;font-weight:700;color:var(--text);text-decoration:none}
.nav-brand span{color:var(--blue)}
.nav-back{font-size:13px;color:var(--blue);text-decoration:none}
.hero{background:linear-gradient(135deg,#FFF7ED 0%,#FFEDD5 100%);padding:48px 24px 40px;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:#fff;border:1px solid #FED7AA;border-radius:100px;padding:5px 14px;font-size:12px;color:#EA580C;font-weight:600;margin-bottom:16px}
.hero h1{font-size:clamp(22px,5vw,30px);font-weight:800;color:var(--text);line-height:1.3;margin-bottom:12px}
.hero p{font-size:14px;color:var(--text2);max-width:480px;margin:0 auto}
.main{max-width:640px;margin:0 auto;padding:32px 16px 80px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px}
.card-title{font-size:14px;font-weight:700;color:var(--text);margin-bottom:16px;display:flex;align-items:center;gap:8px}
.card-title-icon{font-size:18px}
.field{margin-bottom:16px}
.label{display:block;font-size:13px;font-weight:600;color:var(--text2);margin-bottom:6px}
.sublabel{font-size:11px;color:var(--text3);margin-top:3px}
.input-wrap{display:flex;align-items:center;gap:8px}
.input{flex:1;border:1.5px solid var(--border);border-radius:8px;padding:11px 14px;font-size:16px;font-family:inherit;color:var(--text);outline:none;transition:border .2s;-webkit-appearance:none}
.input:focus{border-color:var(--blue)}
.unit{font-size:13px;color:var(--text2);white-space:nowrap}
.select{flex:1;border:1.5px solid var(--border);border-radius:8px;padding:11px 14px;font-size:16px;font-family:inherit;color:var(--text);outline:none;background:#fff;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M0 0l6 8 6-8z' fill='%2394A3B8'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}
.calc-btn{width:100%;padding:15px;background:var(--orange);color:#fff;border:none;border-radius:var(--radius);font-size:16px;font-weight:700;cursor:pointer;font-family:inherit;transition:background .2s;margin-top:8px}
.calc-btn:hover{background:var(--blue-dark)}
#results{display:none}
.result-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px}
.result-title{font-size:15px;font-weight:700;color:var(--text);margin-bottom:16px}
.amount-big{font-size:36px;font-weight:800;color:var(--orange);margin-bottom:4px}
.amount-sub{font-size:13px;color:var(--text3);margin-bottom:20px}
.breakdown{display:flex;flex-direction:column;gap:0}
.breakdown-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--border);font-size:13px}
.breakdown-row:last-child{border-bottom:none;font-weight:700;font-size:15px}
.breakdown-label{color:var(--text2)}
.breakdown-val{font-weight:600;color:var(--text)}
.breakdown-val.orange{color:var(--orange)}
.info-box{background:#FFF7ED;border:1px solid #FED7AA;border-radius:10px;padding:14px 16px;margin-top:16px;font-size:13px;color:#92400E;line-height:1.7}
.cta-card{background:linear-gradient(135deg,#FFF7ED,#FFEDD5);border:1.5px solid #FED7AA;border-radius:var(--radius);padding:24px;text-align:center;margin-top:24px}
.cta-title{font-size:16px;font-weight:700;color:var(--text);margin-bottom:8px}
.cta-sub{font-size:13px;color:var(--text2);margin-bottom:16px;line-height:1.7}
.cta-btn{display:inline-block;background:var(--orange);color:#fff;text-decoration:none;padding:13px 24px;border-radius:var(--radius);font-size:15px;font-weight:600;transition:background .2s}
.cta-btn:hover{background:#C2410C}
.cta-note{font-size:11px;color:var(--text3);margin-top:8px}
.share-card{text-align:center;margin-top:16px}
.share-btn{display:inline-flex;align-items:center;gap:8px;background:#000;color:#fff;text-decoration:none;padding:11px 20px;border-radius:100px;font-size:13px;font-weight:600}
.share-hint{font-size:11px;color:var(--text3);margin-top:8px}
.explainer{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px}
.explainer h2{font-size:16px;font-weight:700;color:var(--text);margin:24px 0 10px;line-height:1.5}
.explainer h2:first-child{margin-top:0}
.explainer p{font-size:13px;color:var(--text2);line-height:1.9;margin-bottom:10px}
.explainer table{width:100%;border-collapse:collapse;margin:12px 0;font-size:12px}
.explainer th,.explainer td{border:1px solid var(--border);padding:7px 8px;text-align:center}
.explainer th{background:var(--bg2);color:var(--text2);font-weight:600}
.explainer td:first-child{text-align:left;color:var(--text2)}
.footer{text-align:center;padding:24px;font-size:11px;color:var(--text3);border-top:1px solid var(--border)}
.footer a{color:var(--text3)}
.input:focus-visible,.select:focus-visible,.calc-btn:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--blue,#2563EB);outline-offset:2px}