/* Palette taken from Kazakhstan road signs: information blue, permit green, prohibition red, warning yellow, asphalt. */
:root {
  --blue: #1E5BB8;
  --blue-ink: #174A96;
  --go: #1F9D55;
  --stop: #D7261E;
  --caution: #F2B705;

  --bg: #F4F6F8;
  --surface: #FFFFFF;
  --surface-2: #EBEEF2;
  --ink: #16181D;
  --ink-2: #4A515C;
  --ink-3: #7A828E;
  --line: #DCE1E7;

  --go-soft: #E3F4EA;
  --stop-soft: #FBE5E3;
  --blue-soft: #E4ECF8;
  --learn: #8DB3E8;       /* "учу" state on the map */
  --new: #C5CCD6;         /* untouched */

  --r: 10px;
  --r-lg: 16px;
  --shadow: 0 1px 2px rgb(16 24 40 / .06), 0 1px 3px rgb(16 24 40 / .08);
  --font: "Onest", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --top-h: 60px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #1A1D21;
  --surface: #23272D;
  --surface-2: #2C3138;
  --ink: #F1F3F5;
  --ink-2: #BAC1CB;
  --ink-3: #8A929D;
  --line: #353B43;
  --blue: #4C8BEA;
  --blue-ink: #79A9F2;
  --go: #3DBE74;
  --stop: #F0554D;
  --go-soft: #1C3527;
  --stop-soft: #3D2120;
  --blue-soft: #22324A;
  --learn: #3E6AA8;
  --new: #3A4048;
  --shadow: none;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 16px/1.55 var(--font);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--blue-ink); }
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -0.01em; }
:focus-visible { outline: 3px solid var(--caution); outline-offset: 2px; border-radius: 6px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 50; }
.skip:focus { left: 8px; }
.muted { color: var(--ink-3); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- Top bar ---------- */
.top {
  position: sticky; top: 0; z-index: 20; height: var(--top-h);
  display: flex; align-items: center; gap: 24px; padding: 0 24px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px; background: var(--blue); position: relative; flex: none;
}
.brand-mark::before { /* dashed lane line */
  content: ""; position: absolute; left: 13.5px; top: 5px; bottom: 5px; width: 3px;
  background: repeating-linear-gradient(to bottom, #fff 0 4px, transparent 4px 7px);
}
.brand-name { font-weight: 800; font-size: 18px; display: flex; flex-direction: column; line-height: 1; }
.brand-sub { font-weight: 500; font-size: 12px; color: var(--ink-3); margin-top: 3px; }
.top-nav { display: flex; gap: 4px; }
.top-nav a {
  text-decoration: none; color: var(--ink-2); font-weight: 500; padding: 8px 12px; border-radius: 8px;
}
.top-nav a:hover { background: var(--surface-2); color: var(--ink); }
.top-nav a[aria-current="page"] { color: var(--ink); background: var(--surface); box-shadow: var(--shadow); }
.top-tools { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.seg { display: inline-flex; background: var(--surface-2); border-radius: 9px; padding: 3px; }
.seg button {
  border: 0; background: transparent; padding: 5px 10px; border-radius: 7px; cursor: pointer;
  font-weight: 600; font-size: 13px; color: var(--ink-3);
}
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.icon-btn {
  width: 38px; height: 38px; display: grid; place-items: center; border-radius: 9px;
  border: 1px solid var(--line); background: var(--surface); cursor: pointer; color: var(--ink-2);
}
.icon-btn:hover { color: var(--ink); }

.bottom-nav { display: none; }

main { max-width: 1180px; margin: 0 auto; padding: 28px 24px 64px; outline: none; }
.loading { padding: 80px 0; text-align: center; color: var(--ink-3); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 42px; padding: 0 16px; border-radius: var(--r);
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  font-weight: 600; font-size: 15px; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { border-color: var(--ink-3); }
.btn:disabled { opacity: .45; cursor: default; border-color: var(--line); }
.btn.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn.primary:hover { background: var(--blue-ink); border-color: var(--blue-ink); }
:root[data-theme="dark"] .btn.primary:hover { background: #3A78D6; border-color: #3A78D6; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--ink-2); }
.btn.ghost:hover { background: var(--surface-2); color: var(--ink); }
.btn.danger { color: var(--stop); }
.btn kbd { font: 600 11px var(--font); padding: 1px 5px; border-radius: 4px; background: rgb(255 255 255 / .2); }
.btn:not(.primary) kbd { background: var(--surface-2); color: var(--ink-3); }

/* ---------- Home ---------- */
.home-head { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: end; margin-bottom: 20px; }
.home-head h1 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; }
.home-head p { margin: 8px 0 0; color: var(--ink-2); max-width: 60ch; }

.map-wrap {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 20px; box-shadow: var(--shadow);
}
.map-legend { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin-bottom: 14px; font-size: 14px; color: var(--ink-2); }
.map-legend b { color: var(--ink); font-weight: 700; }
.lg { display: inline-flex; align-items: center; gap: 6px; }
.lg i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }
.map { display: flex; flex-wrap: wrap; gap: 6px; }
.map-group {
  display: flex; flex-wrap: wrap; gap: 3px; align-content: flex-start; text-decoration: none;
  padding: 5px; border-radius: 6px; background: var(--bg); border: 1px solid transparent;
}
.map-group:hover { border-color: var(--blue); }
.cell { width: 9px; height: 9px; border-radius: 2px; background: var(--new); }
.cell.s-learn { background: var(--learn); }
.cell.s-known { background: var(--go); }
.cell.s-wrong { background: var(--stop); }
.map-group.s-in .cell { animation: pop .45s var(--d, 0ms) both; }
@keyframes pop { from { transform: scale(0); } to { transform: scale(1); } }

.readiness { margin-top: 16px; display: flex; gap: 10px; align-items: center; font-size: 14px; color: var(--ink-2); }
.bar { flex: 1; height: 8px; border-radius: 4px; background: var(--surface-2); display: flex; overflow: hidden; }
.bar i { height: 100%; display: block; }
.bar .k { background: var(--go); } .bar .l { background: var(--learn); } .bar .w { background: var(--stop); }

.actions { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 20px 0 36px; }
.action {
  display: flex; flex-direction: column; gap: 4px; text-align: left; cursor: pointer;
  padding: 16px; border-radius: var(--r-lg); border: 1px solid var(--line); background: var(--surface);
  text-decoration: none; color: var(--ink);
}
.action:hover { border-color: var(--blue); }
.action:disabled { opacity: .5; cursor: default; border-color: var(--line); }
.action strong { font-size: 17px; }
.action span { color: var(--ink-3); font-size: 14px; }
.action.main { background: var(--blue); border-color: var(--blue); color: #fff; }
.action.main span { color: rgb(255 255 255 / .8); }
.action.main:hover { background: var(--blue-ink); }

.section-title { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 0 0 12px; }
.section-title h2 { font-size: 22px; font-weight: 700; }

.cats { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); overflow: hidden; }
.cat {
  display: grid; grid-template-columns: 1fr 200px 90px; gap: 20px; align-items: center;
  padding: 14px 18px; text-decoration: none; color: var(--ink); border-top: 1px solid var(--line);
}
.cat:first-child { border-top: 0; }
.cat:hover { background: var(--surface-2); }
.cat-name { font-weight: 600; }
.cat-sub { font-size: 13px; color: var(--ink-3); }
.cat-pct { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }
.cat-pct small { display: block; font-weight: 500; font-size: 12px; color: var(--ink-3); }

/* ---------- Question base (main page) ---------- */
main:has(.base) { max-width: 1360px; }
.base { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 28px; align-items: start; }
.base-side {
  position: sticky; top: calc(var(--top-h) + 16px); max-height: calc(100vh - var(--top-h) - 32px); overflow-y: auto;
  display: grid; gap: 2px; padding-right: 6px; scrollbar-width: thin;
}
.base-side a {
  display: flex; justify-content: space-between; gap: 10px; align-items: baseline;
  padding: 8px 10px; border-radius: 8px; text-decoration: none; color: var(--ink-2); font-size: 14px; line-height: 1.35;
}
.base-side a:hover { background: var(--surface-2); color: var(--ink); }
.base-side a.on { background: var(--blue); color: #fff; }
.base-side small { color: inherit; opacity: .7; font-variant-numeric: tabular-nums; }
.base-tools { display: flex; gap: 10px; align-items: center; margin-bottom: 18px; }
.cat-pick { display: none; }
.search-mini { position: relative; flex: 1; }
.search-mini .input { padding-left: 38px; }
.search-mini svg { position: absolute; left: 12px; top: 13px; color: var(--ink-3); }
.base-head { margin-bottom: 18px; }
.base-head h1 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; }
.base-head p { margin: 6px 0 0; }
.cards { display: grid; gap: 14px; }
.base-next { margin-top: 24px; display: flex; justify-content: center; }

.qcard {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 18px;
  scroll-margin-top: calc(var(--top-h) + 12px);
}
.qc-head { display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: start; margin-bottom: 14px; }
.qc-num {
  min-width: 30px; height: 30px; padding: 0 6px; border-radius: 8px; display: grid; place-items: center;
  background: var(--surface-2); font-weight: 700; font-size: 14px; color: var(--ink-2); font-variant-numeric: tabular-nums;
}
.qc-head h3 { font-size: 18px; font-weight: 700; line-height: 1.35; padding-top: 3px; }
.qc-head .fav-btn { font-size: 20px; line-height: 1; padding: 4px 8px; }
.qc-body { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.qc-vids { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.qc-vids figure { margin: 0; }
.qc-vids figcaption { font-size: 13px; font-weight: 600; color: var(--ink-3); margin-top: 6px; }
.v-e figcaption { color: var(--go); }
.vbox { position: relative; aspect-ratio: 16 / 10; background: #0F1114; border-radius: 10px; overflow: hidden; }
.vbox video { width: 100%; height: 100%; object-fit: contain; display: block; }
.vbox .vfail { display: none; position: absolute; inset: 0; place-items: center; color: #8A929D; font-size: 13px; text-align: center; padding: 8px; }
.vbox.broken .vfail { display: grid; }
.vbox.broken video { display: none; }

.alist { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.alist li {
  display: grid; grid-template-columns: 26px 1fr; gap: 10px; align-items: start;
  padding: 9px 12px; border-radius: 10px; border: 1px solid var(--line); font-size: 15px; line-height: 1.45; color: var(--ink-2);
}
.alist .key { width: 24px; height: 24px; border-radius: 6px; display: grid; place-items: center; background: var(--surface-2); font-weight: 700; font-size: 13px; }
.qc-expl { margin-top: 12px; font-size: 14px; line-height: 1.55; color: var(--ink-2); white-space: pre-line; }
.qc-expl:empty { display: none; }
.qc-foot { margin-top: 12px; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-3); }
.qc-foot .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--new); }
.qc-foot .dot.s-learn { background: var(--learn); } .qc-foot .dot.s-known { background: var(--go); } .qc-foot .dot.s-wrong { background: var(--stop); }
.reveal { margin-top: 12px; width: 100%; }

/* answers visible */
.qcard.shown .alist li.right { border: 2px solid var(--go); background: var(--go-soft); color: var(--ink); font-weight: 600; padding: 8px 11px; }
.qcard.shown .alist li.right .key { background: var(--go); color: #fff; }
/* answers hidden: explanation and the explanation video wait for "Показать ответ" */
.qcard:not(.shown) .qc-expl { display: none; }
.qcard:not(.shown) .v-e .vbox { filter: blur(14px) brightness(.6); pointer-events: none; }
.qcard:not(.shown) .v-e figcaption::after { content: " · скрыт"; }

@media (max-width: 1100px) {
  .qc-body { grid-template-columns: 1fr; }
}

/* ---------- Category page ---------- */
.back { display: inline-flex; gap: 6px; align-items: center; color: var(--ink-3); text-decoration: none; font-weight: 500; margin-bottom: 14px; }
.back:hover { color: var(--ink); }
.page-head h1 { font-size: clamp(24px, 3.4vw, 32px); font-weight: 800; max-width: 26ch; }
.page-head p { color: var(--ink-2); margin: 8px 0 0; }
.mode-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 28px; }
.qlist { display: grid; gap: 6px; }
.qrow {
  display: grid; grid-template-columns: 12px 1fr auto; gap: 14px; align-items: center;
  padding: 12px 16px; border-radius: var(--r); background: var(--surface); border: 1px solid var(--line);
  text-decoration: none; color: var(--ink); cursor: pointer; text-align: left; width: 100%;
}
.qrow:hover { border-color: var(--ink-3); }
.qrow .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--new); }
.qrow .dot.s-learn { background: var(--learn); } .qrow .dot.s-known { background: var(--go); } .qrow .dot.s-wrong { background: var(--stop); }
.qrow .t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.star { color: var(--caution); }

/* ---------- Quiz ---------- */
.quiz-top { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.quiz-title { font-weight: 600; color: var(--ink-2); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.timer { font-weight: 700; font-variant-numeric: tabular-nums; padding: 6px 12px; border-radius: 8px; background: var(--surface); border: 1px solid var(--line); }
.timer.low { color: var(--stop); border-color: var(--stop); }

/* the road: one dash per question */
.road {
  display: flex; gap: 4px; padding: 10px 12px; background: #2B2F35; border-radius: 10px;
  overflow-x: auto; scrollbar-width: thin; margin-bottom: 18px;
}
.road button {
  flex: 0 0 auto; min-width: 26px; height: 22px; border: 0; border-radius: 3px; cursor: pointer;
  background: #4A5059; color: #C9CED6; font: 600 11px var(--font); padding: 0 4px;
}
.road button.ok { background: var(--go); color: #fff; }
.road button.bad { background: var(--stop); color: #fff; }
.road button.done { background: #8C96A3; color: #1A1D21; }
.road button.cur { background: #fff; color: #16181D; box-shadow: 0 0 0 2px var(--caution); }

.quiz { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.q-media {
  position: relative; background: #0F1114; border-radius: var(--r-lg); overflow: hidden; aspect-ratio: 16 / 10;
}
.q-media video { width: 100%; height: 100%; object-fit: contain; display: block; }
.q-media .nomedia { position: absolute; inset: 0; display: grid; place-items: center; color: #8A929D; font-size: 14px; }
.media-tabs { display: flex; gap: 6px; margin-top: 10px; }
.media-tabs button {
  flex: 1; border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 8px; cursor: pointer;
  font-weight: 600; font-size: 14px; color: var(--ink-2);
}
.media-tabs kbd { font: 600 11px var(--font); padding: 1px 5px; border-radius: 4px; background: var(--surface-2); margin-left: 4px; }
.media-tabs button[aria-pressed="true"] { border-color: var(--blue); color: var(--blue-ink); background: var(--blue-soft); }

.q-text { font-size: clamp(19px, 2.2vw, 23px); font-weight: 700; line-height: 1.35; margin: 0 0 18px; }
.q-meta { display: flex; justify-content: space-between; align-items: center; gap: 8px; color: var(--ink-3); font-size: 14px; margin-bottom: 8px; }
.fav-btn { border: 0; background: none; cursor: pointer; color: var(--ink-3); font-weight: 600; display: inline-flex; gap: 6px; align-items: center; padding: 4px 6px; border-radius: 6px; }
.fav-btn:hover { background: var(--surface-2); }
.fav-btn[aria-pressed="true"] { color: #B58700; }
:root[data-theme="dark"] .fav-btn[aria-pressed="true"] { color: var(--caution); }

.answers { display: grid; gap: 10px; }
.ans {
  display: grid; grid-template-columns: 30px 1fr; gap: 12px; align-items: start; text-align: left;
  padding: 14px 16px; border-radius: 12px; border: 2px solid var(--line); background: var(--surface);
  cursor: pointer; font-size: 16px; line-height: 1.45; transition: border-color .12s, background .12s;
}
.ans:hover:not(:disabled) { border-color: var(--blue); }
.ans:disabled { cursor: default; }
.ans .key {
  width: 28px; height: 28px; border-radius: 7px; display: grid; place-items: center;
  background: var(--surface-2); font-weight: 700; font-size: 14px; color: var(--ink-2);
}
.ans.ok { border-color: var(--go); background: var(--go-soft); }
.ans.ok .key { background: var(--go); color: #fff; }
.ans.bad { border-color: var(--stop); background: var(--stop-soft); }
.ans.bad .key { background: var(--stop); color: #fff; }
.ans.picked { border-color: var(--blue); background: var(--blue-soft); }
.ans.picked .key { background: var(--blue); color: #fff; }
.ans.dim { opacity: .55; }
.ans.just { animation: nudge .28s; }
@keyframes nudge { 30% { transform: translateX(4px); } 60% { transform: translateX(-3px); } }

.verdict { margin-top: 16px; padding: 14px 16px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
.verdict h3 { font-size: 16px; margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.verdict h3 .pill { font-size: 13px; padding: 2px 10px; border-radius: 999px; color: #fff; }
.pill.ok { background: var(--go); } .pill.bad { background: var(--stop); }
.verdict p { margin: 0; color: var(--ink-2); white-space: pre-line; max-width: 70ch; }

.quiz-nav { display: flex; gap: 10px; margin-top: 16px; justify-content: space-between; flex-wrap: wrap; }
.hint { font-size: 13px; color: var(--ink-3); margin-top: 14px; }
.hint kbd { font: 600 12px var(--font); padding: 1px 6px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; background: var(--surface); }

/* ---------- Result ---------- */
.result { max-width: 640px; margin: 20px auto; text-align: center; }
.result .sign {
  width: 140px; height: 140px; margin: 0 auto 18px; border-radius: 50%; display: grid; place-items: center;
  font-size: 28px; font-weight: 800; font-variant-numeric: tabular-nums; animation: pop .45s both;
}
.sign.pass { border: 10px solid var(--go); color: var(--go); }
.sign.fail { border: 10px solid var(--stop); color: var(--stop); }
.sign.neutral { border: 10px solid var(--blue); color: var(--blue-ink); }
.result h1 { font-size: 30px; font-weight: 800; }
.result p { color: var(--ink-2); }
.result .row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 22px; }

/* ---------- Exam intro, settings, stats ---------- */
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 22px; box-shadow: var(--shadow); }
.exam-intro { max-width: 640px; }
.exam-intro ul { padding-left: 20px; color: var(--ink-2); }
.exam-intro li { margin: 4px 0; }
.form { display: grid; gap: 18px; max-width: 640px; }
.field { display: grid; gap: 6px; }
.field label { font-weight: 600; }
.field .help { font-size: 13px; color: var(--ink-3); }
.input {
  min-height: 44px; border-radius: var(--r); border: 1px solid var(--line); background: var(--surface);
  padding: 0 14px; width: 100%;
}
.input:focus { border-color: var(--blue); outline: none; box-shadow: 0 0 0 3px var(--blue-soft); }
.inline { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.search-box { position: relative; margin: 16px 0 20px; }
.search-box .input { min-height: 52px; font-size: 17px; padding-left: 46px; }
.search-box svg { position: absolute; left: 15px; top: 15px; color: var(--ink-3); }
mark { background: color-mix(in srgb, var(--caution) 45%, transparent); color: inherit; border-radius: 3px; padding: 0 2px; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 18px 0 28px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 16px; }
.stat b { display: block; font-size: 28px; font-weight: 800; font-variant-numeric: tabular-nums; }
.stat span { color: var(--ink-3); font-size: 14px; }
table.hist { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.hist th, .hist td { padding: 12px 16px; text-align: left; border-top: 1px solid var(--line); font-variant-numeric: tabular-nums; }
.hist th { border-top: 0; font-size: 13px; color: var(--ink-3); font-weight: 600; }
.tag { font-size: 13px; font-weight: 700; padding: 2px 10px; border-radius: 999px; }
.tag.ok { background: var(--go-soft); color: var(--go); } .tag.bad { background: var(--stop-soft); color: var(--stop); }

.empty { text-align: center; padding: 48px 16px; color: var(--ink-2); }
.empty h2 { font-size: 20px; margin-bottom: 8px; color: var(--ink); }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-weight: 600; font-size: 14px;
  transition: opacity .2s, transform .2s; z-index: 40;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .quiz { grid-template-columns: 1fr; }
  .actions { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  :root { --top-h: 54px; }
  .top { padding: 0 16px; gap: 12px; }
  .top-nav { display: none; }
  .brand-sub { display: none; }
  main { padding: 18px 16px calc(88px + env(safe-area-inset-bottom)); }
  .home-head { grid-template-columns: 1fr; gap: 12px; }
  .cat { grid-template-columns: 1fr 64px; gap: 6px 12px; }
  .cat .bar { grid-column: 1 / -1; grid-row: 2; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .map-wrap { padding: 14px; }
  .cell { width: 8px; height: 8px; }
  .bottom-nav {
    display: grid; grid-template-columns: repeat(5, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
    background: var(--surface); border-top: 1px solid var(--line); padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  }
  .bottom-nav a { display: flex; flex-direction: column; align-items: center; gap: 2px; font-size: 11px; font-weight: 600; color: var(--ink-3); text-decoration: none; padding: 4px 0; }
  .bottom-nav svg { width: 22px; height: 22px; fill: currentColor; }
  .bottom-nav a[aria-current="page"] { color: var(--blue-ink); }
  .base { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .base-side { display: none; }
  .base-tools { flex-wrap: wrap; position: sticky; top: var(--top-h); z-index: 6; background: var(--bg); padding: 10px 0; margin: -10px 0 8px; }
  .cat-pick { display: block; flex: 1 1 100%; min-width: 0; width: 100%; text-overflow: ellipsis; }
  .search-mini { min-width: 0; }
  .base-tools .btn { flex: none; }
  .qcard { padding: 14px; }
  .qc-head h3 { font-size: 17px; }
  .qc-vids { gap: 8px; }
  .quiz-nav {
    position: sticky; bottom: calc(60px + env(safe-area-inset-bottom)); z-index: 5;
    background: var(--bg); padding: 10px 0; margin-bottom: -10px; flex-wrap: nowrap;
  }
  .quiz-nav .btn { flex: 1; }
  .quiz-nav .btn kbd { display: none; }
  .hint { display: none; }
  .hist th:nth-child(4), .hist td:nth-child(4) { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- Nickname login & profile chip ---------- */
.who {
  display: inline-flex; align-items: center; gap: 8px; max-width: 180px; height: 38px; padding: 0 12px;
  border-radius: 9px; border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  text-decoration: none; font-weight: 600; font-size: 14px;
}
.who[hidden] { display: none; }
.who #who-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sync { width: 8px; height: 8px; border-radius: 50%; background: var(--go); flex: none; }
.sync[data-s="saving"] { background: var(--caution); }
.sync[data-s="error"] { background: var(--stop); }
body.no-user .top-nav, body.no-user .bottom-nav { display: none; }

.login { min-height: calc(100vh - var(--top-h) - 120px); display: grid; place-items: center; }
.login-card {
  width: min(460px, 100%); background: var(--surface); border: 1px solid var(--line); border-radius: 20px;
  padding: 32px 28px; box-shadow: var(--shadow);
}
.brand-mark.big { display: block; width: 52px; height: 52px; border-radius: 13px; margin-bottom: 18px; }
.brand-mark.big::before { left: 23.5px; width: 5px; top: 9px; bottom: 9px; background: repeating-linear-gradient(to bottom, #fff 0 7px, transparent 7px 12px); }
.login-card h1 { font-size: 26px; font-weight: 800; }
.login-card > p { color: var(--ink-2); margin: 10px 0 20px; }
.login-form { display: flex; gap: 10px; }
.login-form .input { min-height: 48px; font-size: 17px; }
.login-form .btn { min-height: 48px; padding: 0 22px; }
.login-err { color: var(--stop); font-weight: 600; font-size: 14px; min-height: 1.4em; margin: 10px 0 0; }
.hint-small { font-size: 13px; color: var(--ink-3); margin: 6px 0 0; }
@media (max-width: 760px) {
  .who { max-width: 110px; padding: 0 10px; }
  .top-tools .seg { display: none; }
  .login-form { flex-direction: column; }
}