/* おかね計算室 デザイン */
:root{
  --bg:#f5f7f8;--surface:#fff;--surface-2:#eef2f3;--text:#0f1a1f;--muted:#5a6870;--line:#e0e6e8;
  --brand:#0f766e;--brand-strong:#0b5d57;--brand-soft:#e6f4f2;--on-brand:#fff;--accent:#0f766e;
  --shadow:0 1px 2px rgba(15,26,31,.04),0 4px 16px rgba(15,26,31,.06);
  --radius:16px;--radius-sm:12px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0c1214;--surface:#141c1f;--surface-2:#1b2529;--text:#e6eef0;--muted:#97a6ac;--line:#26333a;
  --brand:#2dd4bf;--brand-strong:#5eead4;--brand-soft:#0f2a28;--on-brand:#04201d;--accent:#2dd4bf;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 6px 20px rgba(0,0,0,.25);
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI","Meiryo",system-ui,sans-serif;line-height:1.8;font-feature-settings:"palt";-webkit-font-smoothing:antialiased}
a{color:var(--brand-strong);text-underline-offset:3px}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}

.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:58px;gap:12px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:800}
.logo-mark{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,#14b8a6,#0f766e);color:#fff;display:grid;place-items:center;font-weight:800}
.gnav{display:flex;gap:4px}
.gnav a{color:var(--muted);text-decoration:none;font-size:.88rem;font-weight:600;padding:6px 10px;border-radius:999px}
.gnav a:hover{color:var(--text);background:var(--surface-2)}
@media (max-width:560px){.gnav .hide-sm{display:none}}

main{padding:20px 0 56px}
h1{font-size:1.5rem;line-height:1.4;margin:.4em 0 .3em}
h2{font-size:1.15rem;line-height:1.4;margin:40px 0 12px}
.lead{color:var(--muted)}
.nb{display:inline-block}

.hero{padding:28px 0 4px}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;color:var(--brand-strong);background:var(--brand-soft);padding:4px 10px;border-radius:999px}
.hero h1{font-size:clamp(1.7rem,6vw,2.4rem);font-weight:800;margin:14px 0 8px}
.hero h1 em{font-style:normal;background:linear-gradient(transparent 62%,color-mix(in srgb,var(--brand) 25%,transparent) 62%)}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin:16px 0}
label{display:block;font-weight:700;font-size:.9rem;margin:14px 0 6px}
input,select{width:100%;font:inherit;font-size:1.05rem;font-variant-numeric:tabular-nums;padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);transition:border-color .12s ease,box-shadow .12s ease}
input:focus,select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 18%,transparent)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}
@media (max-width:520px){.row{grid-template-columns:1fr}.row label:first-child:has(+ label.check){display:none}}
.check{display:flex;align-items:center;gap:10px;font-weight:500;cursor:pointer}
.check input{width:20px;height:20px;accent-color:var(--brand)}
.result{background:linear-gradient(180deg,var(--brand-soft),color-mix(in srgb,var(--brand-soft) 40%,var(--surface)));border:1px solid color-mix(in srgb,var(--brand) 20%,var(--line));border-radius:var(--radius);padding:18px;margin-top:18px}
.big{font-size:2.2rem;font-weight:800;color:var(--brand-strong);line-height:1.3;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
table{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:12px;font-variant-numeric:tabular-nums}
th,td{padding:8px 6px;border-bottom:1px solid color-mix(in srgb,var(--brand) 12%,var(--line));text-align:right}
th{font-size:.78rem;color:var(--muted);font-weight:600}
th:first-child,td:first-child{text-align:left}
.note{display:block;font-size:.83rem;color:var(--muted)}
.scroll{overflow-x:auto}

.tools{list-style:none;padding:0;display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.tools a{display:flex;gap:14px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--text);box-shadow:var(--shadow);transition:transform .15s ease,border-color .15s ease;height:100%}
.tools a:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--brand) 45%,var(--line))}
.tools .icon{flex:none;width:44px;height:44px;border-radius:12px;background:var(--brand-soft);display:grid;place-items:center;font-size:1.35rem}
.tools strong{display:block;margin-bottom:2px}

details{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 16px;margin:8px 0}
details[open]{box-shadow:var(--shadow)}
summary{font-weight:700;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"＋";color:var(--muted)}
details[open] summary::after{content:"－"}

.pr{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;margin:24px 0}
.pr .tag{position:absolute;top:12px;right:12px;font-size:.7rem;color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:0 6px}
.pr a.btn{display:block;text-align:center;background:var(--brand);color:var(--on-brand);text-decoration:none;font-weight:700;border-radius:999px;padding:12px;margin-top:10px}
.ad{margin:28px 0}

footer{border-top:1px solid var(--line);padding:28px 0 40px;font-size:.82rem;color:var(--muted)}
footer a{color:var(--muted)}