:root{--bg: #f6f7f9;--surface: #ffffff;--text: #1a222c;--muted: #5b6674;--accent: #0b6e4f;--accent-light: #e6f4ef;--border: #dde2e8;--radius: 12px}*{box-sizing:border-box}html{font-family:Hiragino Kaku Gothic ProN,Hiragino Sans,BIZ UDPGothic,Meiryo,system-ui,sans-serif;color:var(--text);background:var(--bg);line-height:1.8}body{margin:0;min-height:100vh;display:flex;flex-direction:column}header.site-header{background:var(--surface);border-bottom:1px solid var(--border)}.header-inner{max-width:840px;margin:0 auto;padding:.75rem 1rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.5rem}.brand{font-weight:700;font-size:1.15rem;color:var(--accent);text-decoration:none}nav.site-nav{display:flex;gap:.25rem;flex-wrap:wrap}nav.site-nav a{color:var(--muted);text-decoration:none;font-size:.85rem;padding:.3rem .6rem;border-radius:6px}nav.site-nav a:hover{background:var(--accent-light);color:var(--accent)}main{flex:1;max-width:840px;width:100%;margin:0 auto;padding:1.5rem 1rem 3rem}h1{font-size:1.6rem;line-height:1.4;margin:.5rem 0 .25rem}.lead{color:var(--muted);margin:0 0 1.5rem;font-size:.95rem}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-bottom:2rem}.field{margin-bottom:1rem}.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:.3rem}.field input[type=date],.field input[type=number],.field select{font-size:1.05rem;padding:.5rem .7rem;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--text);max-width:100%}.field-row{display:flex;gap:1rem;flex-wrap:wrap}.field-row .field{flex:1;min-width:180px}button.calc{font-size:1rem;font-weight:700;color:#fff;background:var(--accent);border:none;border-radius:8px;padding:.7rem 2rem;cursor:pointer}button.calc:hover{opacity:.9}.result{margin-top:1.25rem;padding:1rem 1.25rem;background:var(--accent-light);border-radius:8px;display:none}.result.show{display:block}.result .big{font-size:1.7rem;font-weight:700;color:var(--accent)}.result .sub{color:var(--muted);font-size:.9rem;margin-top:.25rem}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem;margin:1.5rem 0}.card-grid a{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;text-decoration:none;color:var(--text);transition:border-color .15s}.card-grid a:hover{border-color:var(--accent)}.card-grid a strong{display:block;color:var(--accent);margin-bottom:.35rem}.card-grid a span{font-size:.85rem;color:var(--muted)}section.doc{margin-top:2.5rem}section.doc h2{font-size:1.2rem;border-left:4px solid var(--accent);padding-left:.6rem}section.doc p,section.doc li{font-size:.95rem}footer.site-footer{background:var(--surface);border-top:1px solid var(--border);padding:1.25rem 1rem;text-align:center;font-size:.8rem;color:var(--muted)}footer.site-footer a{color:var(--muted)}.breadcrumb{font-size:.85rem;color:var(--muted);margin:0 0 1rem}.breadcrumb a{color:var(--muted)}.breadcrumb .sep{margin:0 .4rem}.pager{display:flex;gap:.4rem;flex-wrap:wrap;margin:0 0 1.25rem}.pager a{text-decoration:none;color:var(--muted);border:1px solid var(--border);border-radius:999px;padding:.2rem .75rem;font-size:.85rem;background:var(--surface)}.pager a.is-current{background:var(--accent);border-color:var(--accent);color:#fff}.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:.75rem;margin:0 0 1.5rem}.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:.85rem 1rem}.stat-value{font-size:1.4rem;font-weight:700;color:var(--accent);line-height:1.2}.stat-label{font-size:.8rem;color:var(--muted);margin-top:.2rem}.table-wrap{overflow-x:auto;margin:1rem 0}.data-table{width:100%;border-collapse:collapse;font-size:.92rem;background:var(--surface)}.data-table th,.data-table td{border-bottom:1px solid var(--border);padding:.5rem .7rem;text-align:left;white-space:nowrap}.data-table th{background:var(--accent-light);font-weight:600}.cal-month-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:1.25rem;margin:1.25rem 0}.cal-month{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:.85rem}.cal-month h3{margin:0 0 .5rem;font-size:.95rem}.cal-month h3 a{color:var(--accent);text-decoration:none}.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:2px;font-size:.78rem}.cal-head,.cal-day{text-align:center;padding:.28rem 0}.cal-head{color:var(--muted);font-weight:600}.cal-head.sun,.cal-day.sun{color:#c0392b}.cal-head.sat,.cal-day.sat{color:#1f6aa5}.cal-day.holiday{background:#fdecea;color:#c0392b;font-weight:700;border-radius:4px}.cal-day.empty{visibility:hidden}.cal-wrap.is-compact .cal{font-size:.75rem}.faq h3{font-size:1rem;margin:1.1rem 0 .3rem}.note{font-size:.88rem;color:var(--muted)}.month-cal-large .cal{font-size:.95rem}.month-cal-large .cal-day{padding:.55rem 0}