:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #1d2430;
  --muted: #6b7686;
  --accent: #3b6fe0;
  --accent-text: #ffffff;
  --good: #1f9d55;
  --bad: #d63b3b;
  --border: #d7deea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151a22;
    --card: #1f2632;
    --text: #e9edf3;
    --muted: #9aa5b5;
    --accent: #6b95ff;
    --accent-text: #0e1420;
    --good: #3cc47a;
    --bad: #ff6b6b;
    --border: #334055;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
}
main { width: 100%; max-width: 640px; padding: 24px 16px; }
h1 { text-align: center; font-size: 2rem; margin: 8px 0 24px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  margin-bottom: 16px;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.center { text-align: center; }

button {
  font: inherit;
  border: none;
  border-radius: 14px;
  padding: 14px 22px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}
button:disabled { opacity: 0.5; cursor: default; }
button.secondary { background: transparent; color: var(--accent); border: 2px solid var(--accent); }

input[type="text"], input[type="password"], select, textarea {
  font: inherit;
  padding: 12px 14px;
  border-radius: 12px;
  border: 2px solid var(--border);
  background: var(--bg);
  color: var(--text);
  min-width: 0;
}
input[type="text"]:focus, input[type="password"]:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }

/* ---- test page ---- */
.mode { display: flex; flex-direction: column; gap: 12px; }
.mode button { font-size: 1.5rem; padding: 20px; }
.mode .sub { display: block; font-size: 0.95rem; font-weight: 400; opacity: 0.85; }
.count-row { display: flex; gap: 8px; justify-content: center; align-items: center; margin-top: 4px; }
.count-row button { font-size: 1.1rem; padding: 10px 18px; }
.count-row button.selected { background: var(--accent); color: var(--accent-text); }

.progress { text-align: center; color: var(--muted); margin-bottom: 12px; font-size: 1.1rem; }
.play {
  display: block;
  margin: 0 auto 20px;
  width: 96px; height: 96px;
  border-radius: 50%;
  font-size: 2.4rem;
  padding: 0;
}
.answer-row { display: flex; gap: 10px; }
.answer-row input { flex: 1; font-size: 2rem; text-align: center; padding: 14px; }
.answer-row button { font-size: 1.6rem; min-width: 90px; }
.attempts { text-align: center; font-size: 1.6rem; letter-spacing: 6px; margin-top: 14px; color: var(--muted); }
.attempts .used { color: var(--bad); }

.feedback {
  text-align: center;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.mark { font-size: 6rem; line-height: 1; animation: pop 0.25s ease-out; }
.mark.good { color: var(--good); }
.mark.bad { color: var(--bad); }
.correct-word { font-size: 1.8rem; margin-top: 8px; }
@keyframes pop { from { transform: scale(0.3); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.shake { animation: shake 0.4s; border-color: var(--bad) !important; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-10px); }
  40%, 80% { transform: translateX(10px); }
}

.score { text-align: center; font-size: 2.2rem; font-weight: 700; margin-bottom: 16px; }
.results { list-style: none; padding: 0; margin: 0 0 20px; }
.results li {
  display: flex; justify-content: space-between;
  font-size: 1.4rem; padding: 8px 4px;
  border-bottom: 1px solid var(--border);
}
.results .good { color: var(--good); }
.results .bad { color: var(--bad); }
.buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---- admin ---- */
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row input { flex: 1; }
.word-list { list-style: none; padding: 0; margin: 16px 0 0; }
.word-list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 4px; font-size: 1.2rem;
  border-bottom: 1px solid var(--border);
}
.word-list button.del {
  background: transparent; color: var(--bad);
  padding: 4px 12px; font-size: 1.2rem;
}
.add-form { display: flex; gap: 10px; align-items: flex-start; margin-top: 16px; }
.add-form textarea { flex: 1; resize: vertical; font-size: 1.1rem; }
.hint { font-size: 0.85rem; margin: 6px 0 0; }
.info { color: var(--good); margin-top: 8px; }
.error { color: var(--bad); min-height: 1.4em; margin-top: 4px; }
.weeks { list-style: none; padding: 0; margin: 0; }
.weeks li {
  display: flex; justify-content: space-between;
  padding: 8px 4px; cursor: pointer;
  border-bottom: 1px solid var(--border);
}
.weeks li:hover, .weeks li.active { color: var(--accent); }
a { color: var(--accent); }
.card-title { margin-top: 0; }
.flush { margin: 0; }
.row.spread { justify-content: space-between; }
.results-list { margin-top: 12px; }
.page-head { display: flex; justify-content: space-between; align-items: center; }
.page-head h1 { text-align: left; }
a.button-link {
  display: inline-block; text-decoration: none; font-weight: 600;
  border: 2px solid var(--accent); border-radius: 14px; padding: 12px 20px;
}

/* ---- install the app ---- */
.install-area { margin: 0 4px 16px; }
.install { text-align: center; }
.install-hint {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px 14px; border-radius: 12px; border: 1px dashed var(--border);
  font-size: 0.95rem; color: var(--muted);
}
.install-hint span { flex: 1; }
.install-hint .share-icon { color: var(--accent); }
.install-hint button.link { padding: 0 4px; text-decoration: none; }
.offline-icon { border-radius: 22px; margin: 8px auto 4px; display: block; }

/* ---- login / create account ---- */
.tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.tabs .tab {
  flex: 1; font-size: 1.2rem;
  background: transparent; color: var(--muted);
  border-bottom: 3px solid var(--border); border-radius: 0;
}
.tabs .tab.selected { color: var(--accent); border-bottom-color: var(--accent); }
.auth-form { display: flex; flex-direction: column; gap: 8px; }
.auth-form label { font-size: 1.1rem; font-weight: 600; margin-top: 6px; }
.auth-form input { font-size: 1.5rem; width: 100%; }
.auth-form #password2-row { display: flex; flex-direction: column; gap: 8px; }
.auth-form button[type="submit"] { font-size: 1.4rem; margin-top: 14px; }
.hello { display: flex; justify-content: space-between; align-items: center; font-size: 1.4rem; margin-bottom: 16px; }
button.link { background: none; color: var(--accent); padding: 4px 0; font-weight: 400; text-decoration: underline; }
button.link.danger { color: var(--bad); margin-top: 8px; }
#btn-history { margin-top: 8px; }

/* ---- admin: kids' accounts ---- */
.users { list-style: none; padding: 0; margin: 0; }
.users li { padding: 10px 0; border-bottom: 1px solid var(--border); }
.user-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
button.small { padding: 8px 14px; font-size: 0.95rem; }
.password-form { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
.password-form input { flex: 1; min-width: 140px; }
.password-form .error { flex-basis: 100%; }

/* ---- saved results ---- */
details.result { border-bottom: 1px solid var(--border); padding: 10px 0; }
details.result summary {
  display: flex; justify-content: space-between; gap: 12px;
  cursor: pointer; list-style: none;
}
details.result summary::-webkit-details-marker { display: none; }
details.result summary::before { content: "▸"; color: var(--muted); }
details.result[open] summary::before { content: "▾"; }
.r-title { flex: 1; }
.r-score { font-weight: 700; white-space: nowrap; }
.r-score.good { color: var(--good); }
.results.small { margin: 8px 0 0 20px; }
.results.small li { font-size: 1.1rem; padding: 6px 4px; }
.tries { display: block; font-size: 0.9rem; color: var(--muted); }