/* 4行対応／中央寄せコマンドバー */
:root {
  --bg: #fff;
  --fg: #121212;
  --muted: #666;
  --primary: #0066cc;
  --primary-2: #0052a3;
  --danger: #c62828;
  --ok: #0a7d0a;
  --panel: #f7f9fc;
  --border: #e1e5ee;
  --container: 1000px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Yu Gothic", "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: var(--container); margin: 0 auto; padding: 0 12px; }
.app-header { position: sticky; top: 0; z-index: 100; background: #fff; border-bottom: 1px solid var(--border); }
.app-header .row { display: flex; align-items: center; justify-content: center; padding: .6rem 0; }
.app-header h1 { font-size: 1.1rem; margin: 0; font-weight: 700; }
.cmdbar { position: sticky; top: 48px; z-index: 101; display: grid; grid-template-columns: 1fr auto 1fr; gap: .5rem; align-items: center; background: #fff; border-bottom: 1px solid var(--border); padding: .4rem .2rem; }
.cmdbar .left, .cmdbar .right { display: flex; gap: .35rem; justify-content: center; }
.cmdbar .center { text-align: center; }
.mode-label { font-weight: 600; margin-right: .5rem; }
.progress-label { color: var(--muted); }
main { padding: 1rem 0; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 1rem; margin: 0 0 1rem; }
button, input, select { font-size: 1rem; }
button { border: 1px solid var(--border); background: #fff; padding: .5rem .75rem; border-radius: 8px; cursor: pointer; }
button.primary { background: var(--primary); color: #fff; border-color: var(--primary-2); }
button.primary:hover { background: var(--primary-2); }
button.ghost { background: #fff; }
button.hidden { display: none; }
.view { display: none; }
.view.active { display: block; }
.mode-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: .5rem; margin: .5rem 0 1rem; }
.mode { padding: 1rem; text-align: left; }
.inline-controls { display: flex; flex-wrap: wrap; gap: 1rem; margin: .5rem 0 1rem; }
.io-area { display: flex; gap: .5rem; flex-wrap: wrap; }
.question-text { font-weight: 600; font-size: 1.05rem; margin: .25rem 0 .75rem; }
.entry-table { width: 100%; border-collapse: collapse; background: #fff; }
.entry-table th, .entry-table td { border: 1px solid var(--border); padding: .4rem .5rem; }
.entry-table th { background: #f1f4fb; text-align: left; }
.entry-table .num { text-align: right; }
.entry-table select, .entry-table input[type="number"] { width: 100%; }
.btn-row { margin-top: .8rem; }
.feedback { margin-top: 1rem; }
.feedback .judge { font-weight: 700; }
.feedback .ok { color: var(--ok); }
.feedback .ng { color: var(--danger); }
.feedback .tag { display: inline-block; background: #eaf0ff; border: 1px solid #cdd7ff; color: #1d3faa; padding: .15rem .4rem; border-radius: 9999px; margin-right: .35rem; font-size: .85rem; }
.feedback table { width: 100%; border-collapse: collapse; margin-top: .5rem; background: #fff; }
.feedback th, .feedback td { border: 1px solid var(--border); padding: .4rem .5rem; }
.feedback th { background: #f1f4fb; text-align: left; }
.timer { margin-top: .5rem; color: var(--muted); text-align: center; }
kbd { background: #eee; padding: 0 .25rem; border-radius: 4px; border: 1px solid #ddd; }
.app-footer { border-top: 1px solid var(--border); text-align: center; padding: .75rem 0; color: var(--muted); }
@media (max-width: 700px){
  .cmdbar { grid-template-columns: 1fr; gap: .3rem; top: 46px; }
  .cmdbar .left, .cmdbar .right { justify-content: center; }
  .panel { padding: .75rem; }
  .entry-table th { font-size: .95rem; }
}