/* styles.css - Verbindvraag (matching) */
:root{
  --ok:#22c55e;
  --bad:#ef4444;
  --ink:#0f172a;
  --muted:#64748b;
  --bg:#ffffff;
  --card:#f8fafc;
  --ring: #2563eb;
  --border:#e2e8f0;
  --shadow: 0 1px 2px rgba(0,0,0,.08), 0 4px 10px rgba(0,0,0,.05);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color:var(--ink);
  background:var(--bg);
}

.app{
  max-width: 980px;
  margin: 24px auto;
  padding: 16px;
}

.header{
  margin-bottom: 16px;
}
.header__title{
  margin:0 0 6px;
  font-size: clamp(1.1rem, 1.2rem + 1vw, 1.8rem);
}
.header__note{ color:var(--muted); margin:0; }

.feedback{
  min-height: 24px;
  margin: 12px 0;
  color: var(--muted);
}
.feedback--error{ color: var(--bad); }

.grid{
  display:grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.grid__labels{
  display:grid;
  grid-template-columns: 1fr 1fr;
  font-weight: 600;
  color: var(--muted);
  padding: 6px 4px;
}
.rows{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
}

@media(min-width:768px){
  .grid{ grid-template-columns: 1fr; }
  .rows{ grid-template-columns: 1fr 1fr; }
}

.row{
  display: contents; /* lets children form a two-column grid */
}
.slot{
  background:transparent;
  min-height:60px;
  display:flex;
  align-items:stretch;
}
.slot--left{}
.slot--right{}

.card{
  background: var(--card);
  border:1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
  width:100%;
  display:flex;
  align-items:center;
  gap:10px;
}
.card__handle{
  width: 16px; height: 16px; border-radius: 3px;
  border:1px solid var(--border); background:#fff;
  flex: 0 0 auto;
}
.card__label{ flex: 1; }

.card--right{
  background:#fff;
}

.is-correct .card{ box-shadow: 0 0 0 3px rgba(34,197,94,.35), var(--shadow); }
.is-wrong   .card{ box-shadow: 0 0 0 3px rgba(239,68,68,.35), var(--shadow); }

/* selection/focus */
.card:focus, .slot:focus{
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}
.card--left[aria-selected="true"]{ 
  box-shadow: 0 0 0 3px rgba(37,99,235,.35), var(--shadow);
}

.actions{
  display:flex; gap:8px; margin-top: 16px;
}
.btn{
  appearance:none;
  border:1px solid var(--border);
  background:#fff;
  padding:10px 14px;
  border-radius: 999px;
  cursor:pointer;
  font-weight:600;
}
.btn--primary{ background: #111827; color:#fff; border-color:#111827; }
.btn:focus{ outline:3px solid var(--ring); outline-offset:2px; }
.btn[disabled]{ opacity:.6; cursor:not-allowed; }

/* overlay */
.overlay{
  position: fixed; inset:0;
  background: rgba(0,0,0,.45);
  display:none;
  align-items:center;
  justify-content:center;
  padding: 16px;
}
.overlay[aria-hidden="false"]{ display:flex; }
.overlay__dialog{
  background: #fff;
  border-radius: 16px;
  padding: 20px;
  max-width: 520px;
  width: 100%;
  box-shadow: var(--shadow);
}
.overlay__title{ margin:0 0 8px; }
.overlay__body{ margin:0 0 16px; color: var(--muted); }