:root {
  --bg: #f4f7fb; --card: #ffffff; --ink: #1c2633; --muted: #5d6b7a; --line: #dfe5ee;
  --brand: #1f3a5f; --accent: #f5b700; --ok: #2e9e5b; --bad: #d9534f; --part: #e69500;
  --radius: 16px; --tap: 52px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1722; --card: #182231; --ink: #e8eef6; --muted: #9aa8b8; --line: #2a3647; --brand: #9cc3ff; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; -webkit-text-size-adjust: 100%; }
button { font: inherit; color: inherit; }

.topbar { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 8px;
  padding: calc(env(safe-area-inset-top) + 8px) 12px 8px; background: var(--brand); color: #fff; }
@media (prefers-color-scheme: dark) { .topbar { background: #13233a; } }
.topbar h1 { flex: 1; margin: 0; font-size: 19px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.icon-btn { min-width: 44px; height: 44px; border: 0; border-radius: 12px; background: rgba(255,255,255,.12); color: #fff; font-size: 22px; }

main { max-width: 720px; margin: 0 auto; padding: 16px 16px calc(env(safe-area-inset-bottom) + 96px); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin-bottom: 12px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
h2 { font-size: 22px; margin: 4px 0 12px; }
h3 { font-size: 18px; margin: 0 0 8px; }

.btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; min-height: var(--tap);
  border: 0; border-radius: 14px; padding: 12px 16px; background: var(--brand); color: #fff; font-weight: 600; cursor: pointer; }
@media (prefers-color-scheme: dark) { .btn { color: #0f1722; } }
.btn.secondary { background: transparent; color: var(--ink); border: 2px solid var(--line); }
.btn.accent { background: var(--accent); color: #1c2633; }
.btn:disabled { opacity: .45; }
.row { display: flex; gap: 10px; }
.row > * { flex: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (min-width: 700px) { .grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; } }

/* Login */
.avatars { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.avatar { padding: 20px 12px; text-align: center; border-radius: var(--radius); background: var(--card); border: 2px solid var(--line); cursor: pointer; }
.avatar .face { font-size: 44px; }
.pin { display: flex; justify-content: center; gap: 10px; margin: 16px 0; }
.pin span { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--brand); }
.pin span.on { background: var(--brand); }
.keypad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; max-width: 320px; margin: 0 auto; }
.keypad button { height: 64px; border-radius: 16px; border: 1px solid var(--line); background: var(--card); font-size: 24px; }

/* Progress */
.bar { height: 10px; background: var(--line); border-radius: 6px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--ok)); border-radius: 6px; }
.section-row { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); }
.section-row:first-child { border-top: 0; }
.section-row .name { flex: 1; }
.pill { display: inline-block; padding: 2px 10px; border-radius: 99px; background: var(--line); font-size: 13px; }

/* Language switch */
.langs { display: inline-flex; gap: 4px; padding: 3px; border-radius: 12px; background: var(--line); }
.langs button { border: 0; background: transparent; padding: 6px 12px; border-radius: 9px; font-weight: 600; font-size: 14px; text-transform: uppercase; }
.langs button.on { background: var(--card); box-shadow: 0 1px 3px rgba(0,0,0,.15); }

/* Questions */
.q-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 10px; }
.q-prompt { font-size: 20px; font-weight: 600; margin: 6px 0 14px; }
.q-translation { font-size: 15px; color: var(--muted); margin: -8px 0 14px; padding-left: 10px; border-left: 3px solid var(--accent); }
.options { display: grid; gap: 10px; }
.option { min-height: var(--tap); text-align: left; padding: 12px 14px; border-radius: 14px; border: 2px solid var(--line); background: var(--card); cursor: pointer; }
.option.selected { border-color: var(--brand); background: rgba(31,58,95,.08); }
.option.correct { border-color: var(--ok); background: rgba(46,158,91,.12); }
.option.wrong { border-color: var(--bad); background: rgba(217,83,79,.10); }
.input { width: 100%; min-height: var(--tap); padding: 12px 14px; border-radius: 14px; border: 2px solid var(--line); background: var(--card); color: var(--ink); font: inherit; }
textarea.input { min-height: 120px; resize: vertical; }
.order-item { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 12px; border: 2px solid var(--line); background: var(--card); margin-bottom: 8px; }
.order-item .t { flex: 1; }
.order-item button { width: 44px; height: 44px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); font-size: 18px; }
.order-item.ok { border-color: var(--ok); } .order-item.bad { border-color: var(--bad); }
.match-row { display: grid; grid-template-columns: 1fr; gap: 6px; padding: 10px 0; border-top: 1px solid var(--line); }
@media (min-width: 600px) { .match-row { grid-template-columns: 1fr 1fr; align-items: center; } }
select.input { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%; background-size: 6px 6px; background-repeat: no-repeat; padding-right: 36px; }
.diagram { width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); background: #fff; }
.dg-num { font: 700 14px sans-serif; fill: #1c2633; }
.dg-label { font: 600 13px sans-serif; fill: #10233d; paint-order: stroke; stroke: #fff; stroke-width: 3px; }
.dg-small { font: 600 12px sans-serif; }
.label-slot { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
.label-slot .n { flex: 0 0 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #1c2633; display: grid; place-items: center; font-weight: 700; }
.label-slot select { flex: 1; }

.feedback { margin-top: 14px; padding: 14px; border-radius: 14px; }
.feedback.ok { background: rgba(46,158,91,.12); border: 1px solid var(--ok); }
.feedback.part { background: rgba(230,149,0,.12); border: 1px solid var(--part); }
.feedback.bad { background: rgba(217,83,79,.10); border: 1px solid var(--bad); }
.feedback .verdict { font-weight: 700; margin-bottom: 6px; }
.say-it { margin-top: 8px; font-style: italic; }

.sticky-actions { position: fixed; left: 0; right: 0; bottom: 0; padding: 12px 16px calc(env(safe-area-inset-bottom) + 12px);
  background: linear-gradient(transparent, var(--bg) 30%); }
.sticky-actions .inner { max-width: 720px; margin: 0 auto; display: flex; gap: 10px; }

.mic { width: 100%; min-height: 64px; border-radius: 18px; border: 0; background: #d9534f; color: #fff; font-weight: 700; font-size: 18px; }
.mic.idle { background: var(--brand); }
@media (prefers-color-scheme: dark) { .mic.idle { color: #0f1722; } }
.mic .dot { display: inline-block; width: 12px; height: 12px; border-radius: 50%; background: #fff; margin-right: 8px; animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .3; } }
.spinner { width: 22px; height: 22px; border: 3px solid var(--line); border-top-color: var(--brand); border-radius: 50%; animation: spin .8s linear infinite; display: inline-block; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Learn mode */
.summary li { margin: 6px 0; }
.flash { min-height: 180px; display: flex; flex-direction: column; justify-content: center; text-align: center; cursor: pointer; }
.flash .term { font-size: 26px; font-weight: 700; }
.flash .def { margin-top: 12px; }
.star { color: var(--accent); }
.gloss td { padding: 8px 6px; border-top: 1px solid var(--line); vertical-align: top; }
.gloss { width: 100%; border-collapse: collapse; font-size: 15px; }

.result-big { font-size: 46px; font-weight: 800; text-align: center; margin: 8px 0; }
#toast { position: fixed; left: 50%; bottom: calc(env(safe-area-inset-bottom) + 90px); transform: translateX(-50%);
  background: #1c2633; color: #fff; padding: 10px 16px; border-radius: 12px; z-index: 20; max-width: 90vw; }

.q-prompt .q-translation { margin: 6px 0 0; font-weight: 500; }

.book-fig { margin: 4px 0 12px; }
.book-fig img { width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); }
.book-fig figcaption { font-size: 13px; color: var(--muted); margin-top: 4px; }