:root{
  --bg: #f5f7f2;
  --card: #fff;
  --text: #222;
  --muted: #666;
  --acc: #0c6;
  --danger: #d33;
  --border: #dcdcdc;
  --grid: #bfc7c7;
  --wrong: #ffe8e8;
}
* { box-sizing: border-box; }
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans JP","Yu Gothic UI","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;line-height:1.6;}
.practice-header{background:linear-gradient(135deg,#0f1840,#1f2d5c);color:#f4f7ff;border-bottom:1px solid rgba(15,23,42,.12);box-shadow:0 10px 24px rgba(15,23,42,.18);margin-bottom:18px}
.practice-header__inner{width:min(1100px,94%);margin-inline:auto;padding:18px 4px 20px;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.practice-header__brand{display:flex;flex-direction:column;gap:6px;min-width:220px}
.practice-header__badge{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:999px;background:rgba(255,255,255,.16);font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}
.practice-header__title{font-size:clamp(22px,3.2vw,30px);font-weight:800;letter-spacing:.04em}
.practice-header__nav{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.practice-header__link{display:inline-flex;align-items:center;padding:8px 16px;border-radius:999px;text-decoration:none;color:inherit;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.14);font-weight:600;transition:.18s ease background,.18s ease color,.18s ease border-color}
.practice-header__link:hover{background:rgba(255,255,255,.22);border-color:rgba(255,255,255,.3)}
.practice-header__link.is-active{background:#fff;color:#102347;border-color:#fff;box-shadow:0 6px 16px rgba(15,23,42,.22)}
@media (max-width:760px){.practice-header__inner{flex-direction:column;align-items:flex-start}.practice-header__nav{justify-content:flex-start}}
.container{max-width:1100px;margin:0 auto;padding:16px;}
.card{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:16px;margin:14px 0;box-shadow:0 2px 10px rgba(0,0,0,.03);}
.section-title{margin:.2em 0 .6em;font-size:1.25rem}
.section-subtitle{margin:1.2em 0 .6em;font-size:1.05rem}
.lead{margin-top:4px;color:#333}
.note{color:var(--muted);margin-top:-8px}

.site-header{background:#104; color:#fff; padding:10px 0 14px}
.site-title{font-weight:700; font-size:18px; text-align:center; margin-bottom:8px}
.main-nav{display:flex; gap:8px; justify-content:center} /* 中央寄せ */
.main-nav .nav-item{color:#e7e7ff;text-decoration:none;background:rgba(255,255,255,.12);padding:6px 10px;border-radius:6px}
.main-nav .nav-item.current{background:#0c6;color:#fff}
.main-nav .nav-item.disabled{opacity:.55;cursor:not-allowed}

.controls .controls-row{display:flex;align-items:center;gap:10px;margin:8px 0}
.controls .lbl{min-width:88px;color:#333;font-weight:600}
.controls .spacer{flex:1 1 auto}
.controls .nav-group{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.btn{background:#eee;border:1px solid var(--border);padding:8px 12px;border-radius:6px;cursor:pointer}
.btn:hover{filter:brightness(0.98)}
.btn.primary{background:var(--acc);border-color:#0b5;color:#fff}
.btn.danger{background:var(--danger);border-color:#b12;color:#fff}

.table-scroll{overflow:auto;border:1px solid var(--border);border-radius:6px}
.table{width:100%;border-collapse:collapse;table-layout:fixed}
.table colgroup col:nth-child(1){width:16%}
.table colgroup col:nth-child(2){width:16%}
.table colgroup col:nth-child(3){width:36%}
.table colgroup col:nth-child(4){width:16%}
.table colgroup col:nth-child(5){width:16%}
.table th,.table td{border:1px solid var(--grid);padding:6px 8px;vertical-align:middle}
.table th{text-align:center;background:#f1f6ff}
.table td.name{padding-left:12px}
.table tfoot td{background:#fcfff4;font-weight:700}
.num{font-feature-settings:"tnum";text-align:right}
input.num-input{width:100%;text-align:right;padding:6px;border:1px solid var(--border);border-radius:4px;background:#fff}
input.num-input::placeholder{color:#bbb}
input.num-input.wrong{background:var(--wrong);border-color:#f66}

.actions{margin:12px 0 6px;display:flex;gap:8px}
#resultArea .result-block{margin:12px 0;padding:12px;border:1px solid var(--border);border-radius:6px;background:#fafafa}
#resultArea .result-block h4{margin:0 0 6px}
.result-list{margin:0;padding-left:1.2em}
.result-list li{margin:2px 0}
.ok{color:#0a7}
.ng{color:var(--danger)}

.site-footer{padding:18px 0 28px;text-align:center;color:#666}

.q2-list{display:grid;grid-template-columns:1fr;gap:8px;margin-top:6px}
.q2-item{display:flex;align-items:center;gap:8px}
.q2-item .q2-label{flex:1 1 auto}
.q2-item input{width:180px}
.q2-hint{color:var(--muted);font-size:.95rem;margin-top:4px}

#historyTable table{width:100%;border-collapse:collapse}
#historyTable th,#historyTable td{border:1px solid var(--border);padding:6px;text-align:center}
#historyTable th{background:#f7f7f7}

@media (max-width: 720px){
  .table colgroup col:nth-child(3){width:40%}
  .q2-item input{width:130px}
}