:root {
  --bg: #0f172a; --card: #1e293b; --card2: #273449; --fg: #e2e8f0; --muted: #94a3b8;
  --accent: #0ba85a; --accent-d: #0a8f4d; --danger: #ef4444; --warn: #f59e0b;
  --ok: #22c55e; --line: #334155; --radius: 14px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--fg); font-size: 17px; line-height: 1.45;
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  padding-bottom: env(safe-area-inset-bottom);
}
.screen { max-width: 680px; margin: 0 auto; padding: 16px; }
[hidden] { display: none !important; }

h1, h2, h3 { line-height: 1.2; }
.muted { color: var(--muted); }
.center { text-align: center; }
.small { font-size: 14px; }

/* Topbar */
#topbar {
  position: sticky; top: 0; z-index: 10; background: var(--card);
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
#topbar .title { font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#topbar button { padding: 6px 10px; font-size: 14px; }

/* Cards / buttons */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin: 12px 0; }
button, .btn {
  display: inline-block; background: var(--accent); color: #fff; border: none;
  border-radius: 12px; padding: 13px 18px; font-size: 16px; font-weight: 600;
  cursor: pointer; touch-action: manipulation;
}
button:active { background: var(--accent-d); }
button.secondary { background: var(--card2); color: var(--fg); border: 1px solid var(--line); }
button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
button.danger { background: var(--danger); }
button:disabled { opacity: .5; }
button.block, .btn.block { display: block; width: 100%; margin: 8px 0; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row.between { justify-content: space-between; }

input[type=text], input[type=password], input[type=number], select {
  width: 100%; padding: 13px; font-size: 16px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--card2); color: var(--fg);
}

/* Quiz */
.qtext { font-size: 19px; font-weight: 600; margin: 6px 0 16px; }
.opt {
  display: flex; align-items: center; gap: 12px; background: var(--card2);
  border: 2px solid var(--line); border-radius: 12px; padding: 14px; margin: 10px 0;
  cursor: pointer; transition: border-color .15s;
}
.opt.sel { border-color: var(--accent); }
.opt.correct { border-color: var(--ok); background: #14331f; }
.opt.wrong { border-color: var(--danger); background: #33191b; }
.opt input { width: auto; flex: none; transform: scale(1.3); }
.opt .num { width: 64px; flex: none; text-align: center; padding: 8px; }
.opt .txt { flex: 1; }

.match-row { display: flex; gap: 10px; align-items: center; margin: 10px 0; }
.match-row .left { flex: 1; background: var(--card2); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px; }
.match-targets { margin: 8px 0 16px; }
.match-targets .t { padding: 4px 0; }

.feedback { border-radius: 12px; padding: 12px; margin: 12px 0; font-weight: 600; }
.feedback.ok { background: #14331f; color: var(--ok); }
.feedback.no { background: #33191b; color: #fca5a5; }

/* Stats / progress */
.stats { display: flex; gap: 14px; font-size: 14px; color: var(--muted); margin: 8px 0; }
.stats b { color: var(--fg); }
.bar { height: 8px; background: var(--card2); border-radius: 6px; overflow: hidden; margin: 6px 0; }
.bar > i { display: block; height: 100%; background: var(--accent); width: 0; transition: width .3s; }

.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px; margin: 10px 0; font-size: 14px; }
.toolbar label { display: flex; align-items: center; gap: 6px; }
.switch { font-size: 14px; }

.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--card2); border: 1px solid var(--line); padding: 12px 18px;
  border-radius: 12px; z-index: 50; max-width: 90%; }

details { background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 14px; margin: 10px 0; }
details summary { font-weight: 600; cursor: pointer; }
.err { color: #fca5a5; min-height: 20px; }
ul.bank li { display: flex; justify-content: space-between; gap: 10px; align-items: center;
  border-bottom: 1px solid var(--line); padding: 10px 0; }