:root {
  --bg: #f4f5f9;
  --card: #ffffff;
  --text: #1c1f2b;
  --muted: #6b7083;
  --line: #e1e3ea;
  --accent: #4f5bd5;
  --accent-dark: #3d48b8;
  --ok: #1f9d55;
  --ok-bg: #e6f6ec;
  --bad: #d64545;
  --bad-bg: #fbe9e9;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 24px; background: var(--card); border-bottom: 1px solid var(--line);
}
.top .brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
.top nav { display: flex; gap: 14px; align-items: center; }
.top nav a { color: var(--accent); text-decoration: none; }
.wrap { max-width: 820px; margin: 0 auto; padding: 24px 16px 60px; }
h1 { margin: 0 0 16px; }
h2 { margin: 0 0 4px; font-size: 20px; }
h2 a { color: var(--text); text-decoration: none; }
h2 a:hover { color: var(--accent); }
.muted { color: var(--muted); margin: 0; font-size: 14px; }

.btn {
  display: inline-block; padding: 9px 16px; border-radius: 8px;
  border: 1px solid var(--accent); background: var(--card); color: var(--accent);
  font: inherit; cursor: pointer; text-decoration: none;
}
.btn:hover { background: #eef0fb; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); }
.btn.danger { border-color: var(--bad); color: var(--bad); }
.btn.danger:hover { background: var(--bad-bg); }
.btn.small { padding: 5px 10px; font-size: 14px; }
.link { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 16px; padding: 4px 8px; }
.link:hover { color: var(--bad); }

.flash { background: var(--ok-bg); color: var(--ok); padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }
.errors { background: var(--bad-bg); color: var(--bad); padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }
.errors ul { margin: 0; padding-left: 20px; }
.empty { text-align: center; padding: 48px 16px; background: var(--card); border-radius: 12px; }

.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.card {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px;
}
.card .actions { display: flex; gap: 8px; align-items: center; flex-shrink: 0; }
.card form { margin: 0; }

.field { display: block; margin-bottom: 14px; }
.field span { display: block; font-size: 14px; color: var(--muted); margin-bottom: 4px; }
input[type=text] {
  width: 100%; padding: 9px 12px; font: inherit; border: 1px solid var(--line);
  border-radius: 8px; background: #fff;
}
input[type=text]:focus { outline: 2px solid var(--accent); border-color: transparent; }

fieldset.question {
  position: relative; border: 1px solid var(--line); border-radius: 12px;
  background: var(--card); padding: 16px 20px; margin: 0 0 16px;
}
fieldset.question legend { font-weight: 600; padding: 0 6px; }
fieldset.question .remove-q { position: absolute; top: 10px; right: 10px; }
.options { display: grid; gap: 8px; margin-bottom: 8px; }
.option { display: flex; align-items: center; gap: 8px; }
.option input[type=radio] { width: 18px; height: 18px; accent-color: var(--ok); flex-shrink: 0; }
.hint { font-size: 13px; color: var(--muted); margin: 0 0 10px; }
.form-actions { display: flex; gap: 12px; justify-content: space-between; flex-wrap: wrap; margin-top: 8px; }

.qtext { font-size: 17px; margin: 4px 0 12px; }
.choices { display: grid; gap: 8px; }
.choice {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  border: 1px solid var(--line); border-radius: 8px; cursor: pointer;
}
.choice:hover { border-color: var(--accent); }
.choice input { accent-color: var(--accent); width: 18px; height: 18px; }
.choice.correct { border-color: var(--ok); background: var(--ok-bg); }
.choice.wrong { border-color: var(--bad); background: var(--bad-bg); }
fieldset.is-ok legend { color: var(--ok); }
fieldset.is-bad legend { color: var(--bad); }

.result {
  text-align: center; background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 24px; margin-bottom: 24px;
}
.result .score { font-size: 44px; font-weight: 700; color: var(--accent); }
.result .pct { color: var(--muted); margin-bottom: 14px; }
.result .actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.form-actions > span { display: flex; gap: 10px; }
.muted a { color: var(--accent); }
h1 + .muted { margin-bottom: 20px; }

/* ---------- Mobile ---------- */
input[type=text] { font-size: 16px; } /* prevents iOS auto-zoom on focus */
.btn { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
.choice { min-height: 48px; }
.option input[type=radio], .choice input { width: 22px; height: 22px; }
.link { min-width: 40px; min-height: 40px; }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .top { padding: 10px 16px; flex-wrap: wrap; gap: 8px; }
  .top .brand { font-size: 18px; }
  .top nav { gap: 10px; }
  .top nav .btn { padding: 7px 12px; min-height: 38px; font-size: 14px; }
  .wrap { padding: 16px 12px 40px; }
  h1 { font-size: 24px; margin-bottom: 12px; }
  h2 { font-size: 18px; }

  .card { flex-direction: column; align-items: stretch; padding: 14px 16px; }
  .card .actions { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
  .card .actions .btn, .card .actions form { width: 100%; }
  .card .actions form .btn { width: 100%; }
  .card .actions .btn { padding: 9px 8px; font-size: 14px; }

  fieldset.question { padding: 14px 12px; border-radius: 10px; }
  fieldset.question .remove-q { top: 6px; right: 6px; }
  .option { gap: 6px; }
  .option input[type=text] { min-width: 0; flex: 1; }
  .option .link { padding: 4px; }

  .form-actions { flex-direction: column; align-items: stretch; }
  .form-actions .btn, .form-actions > span { width: 100%; }
  .form-actions > span { flex-direction: column; }

  .qtext { font-size: 16px; }
  .choice { padding: 10px 12px; }
  .result { padding: 18px 14px; }
  .result .score { font-size: 38px; }
  .result .actions { flex-direction: column; }
  .result .actions .btn { width: 100%; }
  .empty { padding: 32px 12px; }
}