:root {
  color-scheme:light;
  --bg:#f7f8fc;
  --surface:#fff;
  --ink:#172541;
  --muted:#67738a;
  --line:#e3e7f0;
  --accent:#4759d6;
  --tint:#eef0ff;
  --green:#14734d;
  --red:#b83243;
  --radius:20px;
}
* {
  box-sizing:border-box;
}
body {
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
button,input,select,textarea {
  font:inherit;
}
a {
  color:var(--accent);
  text-decoration:none;
}
button,a,input,select,textarea {
  -webkit-tap-highlight-color:transparent;
}
button,.button {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  border:1px solid transparent;
  border-radius:12px;
  background:var(--accent);
  color:white;
  font-weight:650;
  min-height:48px;
  padding:11px 20px;
  cursor:pointer;
  transition:background .15s,transform .15s;
}
button:hover,.button:hover {
  filter:brightness(.96);
}
button:disabled {
  opacity:.5;
  cursor:not-allowed;
}
button:active {
  transform:translateY(1px);
}
button.secondary,.button.secondary {
  background:var(--surface);
  color:var(--ink);
  border-color:var(--line);
}
button.danger {
  background:var(--red);
}
button.danger-text {
  background:transparent;
  color:var(--red);
  border-color:var(--line);
}
:focus-visible {
  outline:3px solid #8997fa;
  outline-offset:3px;
}
[hidden] {
  display:none!important;
}
h1,h2,h3,p {
  margin:0;
}
h1 {
  font-size:clamp(27px,5vw,38px);
  line-height:1.2;
  letter-spacing:-1.1px;
  margin:12px 0;
}
h2 {
  font-size:21px;
  letter-spacing:-.4px;
}
h3 {
  font-size:18px;
}
p {
  color:var(--muted);
}
.topbar {
  max-width:1200px;
  margin:auto;
  padding:24px 32px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding-top:max(24px,env(safe-area-inset-top),var(--tg-safe-area-inset-top,0px));
}
.brand {
  display:flex;
  align-items:center;
  gap:12px;
  font-weight:750;
  color:var(--ink);
  line-height:1.3;
  white-space:nowrap;
}
.brand small {
  display:block;
  color:var(--muted);
  font-size:9px;
  letter-spacing:1.7px;
  margin-top:4px;
}
.brand-mark {
  display:grid;
  place-content:center;
  position:relative;
  width:44px;
  height:44px;
  background:var(--ink);
  color:#fff;
  border-radius:13px;
  font-size:24px;
  letter-spacing:-2px;
}
.brand-mark span {
  position:absolute;
  right:6px;
  top:2px;
  color:#9faafb;
}
.profile {
  display:flex;
  align-items:center;
  gap:12px;
  font-size:13px;
}
.avatar {
  display:grid;
  place-content:center;
  border-radius:50%;
  background:var(--tint);
  color:var(--accent);
  height:38px;
  width:38px;
  font-weight:700;
}
.shell {
  max-width:760px;
  margin:20px auto 0;
  padding:0 24px 130px;
}
.shell.wide {
  max-width:1140px;
}
.page-heading {
  margin:28px 0;
}
.eyebrow {
  font-size:11px;
  letter-spacing:2px;
  font-weight:750;
  color:var(--accent);
}
.card {
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px;
  box-shadow:0 3px 10px #14254103;
  margin-bottom:20px;
}
.section-top {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:20px;
}
.pill,.badge {
  display:inline-block;
  border-radius:7px;
  padding:4px 9px;
  background:var(--tint);
  color:var(--accent);
  font-size:11px;
  font-weight:700;
  letter-spacing:.4px;
}
.badge.draft {
  background:#edf0f5;
  color:#59677d;
}
.badge.approved {
  background:#e9f6ef;
  color:var(--green);
}
.muted,.caption {
  color:var(--muted);
}
.caption {
  font-size:13px;
  text-align:center;
  margin-top:18px;
}
.full {
  width:100%;
}
.filter-grid {
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr;
  gap:14px;
  margin:20px 0;
}
.form-grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
}
label {
  display:block;
  color:var(--ink);
  font-size:13px;
  font-weight:650;
  margin-bottom:16px;
}
input,select,textarea {
  width:100%;
  min-height:48px;
  margin-top:7px;
  padding:11px 12px;
  border:1px solid var(--line);
  background:var(--surface);
  color:var(--ink);
  border-radius:10px;
  font-size:16px;
}
textarea {
  resize:vertical;
}
.filter-grid label {
  margin:0;
}
.bottom-nav {
  position:fixed;
  z-index:10;
  bottom:20px;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  justify-content:space-around;
  width:min(520px,calc(100% - 32px));
  padding:6px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  box-shadow:0 6px 30px #1725410a;
  margin-bottom:env(safe-area-inset-bottom);
}
.bottom-nav a {
  flex:1;
  text-align:center;
  display:flex;
  flex-direction:column;
  align-items:center;
  font-size:11px;
  color:var(--muted);
  padding:5px 8px;
  border-radius:12px;
  min-height:52px;
}
.bottom-nav a span {
  font-size:21px;
  line-height:1.2;
}
.bottom-nav a[aria-current] {
  color:var(--accent);
  background:var(--tint);
  font-weight:700;
}
.learning-note {
  display:flex;
  gap:14px;
  padding:16px 4px;
  font-size:13px;
}
.learning-note strong {
  font-weight:650;
}
.learning-note p {
  margin-top:3px;
}
.note-icon {
  background:var(--tint);
  border-radius:12px;
  color:var(--accent);
  font-size:24px;
  min-width:42px;
  height:42px;
  text-align:center;
}
.dev-banner {
  font-size:11px;
  color:var(--muted);
  padding:8px 0;
  border-bottom:1px dashed var(--line);
}
.question-meta {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-size:13px;
  color:var(--muted);
  margin-bottom:10px;
}
.progress {
  width:100%;
  height:6px;
  border:0;
  border-radius:20px;
  overflow:hidden;
  background:#edf0f6;
  accent-color:var(--accent);
  display:block;
}
.progress::-webkit-progress-bar {
  background:#edf0f6;
  border-radius:20px;
}
.progress::-webkit-progress-value {
  background:var(--accent);
  border-radius:20px;
}
.progress::-moz-progress-bar {
  background:var(--accent);
}
.question-text {
  font-size:24px;
  line-height:1.4;
  margin:26px 0;
  overflow-wrap:anywhere;
}
.options {
  border:0;
  padding:0;
  margin:0 0 24px;
  display:grid;
  gap:12px;
  min-width:0;
}
.option {
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  margin:0;
  border:1px solid var(--line);
  border-radius:13px;
  padding:15px;
  background:var(--surface);
  font-size:16px;
  font-weight:450;
  cursor:pointer;
  overflow-wrap:anywhere;
}
.option input {
  width:18px;
  height:18px;
  min-height:0;
  margin:0;
  accent-color:var(--accent);
  flex-shrink:0;
}
.option:has(input:checked) {
  border-color:var(--accent);
  background:var(--tint);
}
.option:has(input:focus-visible) {
  outline:3px solid #8997fa;
  outline-offset:2px;
}
.letter {
  display:grid;
  place-content:center;
  flex-shrink:0;
  border-radius:7px;
  background:var(--bg);
  width:32px;
  height:32px;
  color:var(--muted);
  font-weight:700;
  font-size:13px;
}
.option.correct {
  border-color:var(--green);
  background:#f1faf5;
}
.option.incorrect {
  border-color:var(--red);
  background:#fff3f4;
}
.feedback {
  border-radius:14px;
  background:var(--bg);
  padding:22px;
  margin:16px 0 24px;
  overflow-wrap:anywhere;
}
.feedback h3 {
  margin-bottom:18px;
}
.success {
  color:var(--green);
}
.error-text {
  color:var(--red);
}
.feedback strong {
  display:block;
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:1px;
  margin:16px 0 4px;
}
.feedback p {
  color:var(--ink);
  white-space:pre-wrap;
}
.feedback pre {
  white-space:pre-wrap;
  overflow-wrap:anywhere;
  font-size:13px;
  line-height:1.7;
  background:var(--surface);
  border:1px solid var(--line);
  padding:14px;
  border-radius:9px;
}
.actions {
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top:20px;
}
.actions>* {
  flex:1;
}
.loading,.empty {
  text-align:center;
  padding:38px 24px;
  color:var(--muted);
}
.empty h2 {
  color:var(--ink);
  margin-bottom:12px;
}
.empty .empty-symbol {
  font-size:32px;
  color:var(--accent);
  margin-bottom:12px;
}
.empty p {
  max-width:400px;
  margin:auto;
}
.empty .button {
  margin-top:22px;
}
.error-box {
  border:1px solid #f0c6ca;
  background:#fff7f8;
  border-radius:12px;
  padding:18px;
  margin:12px 0;
  color:var(--red);
}
.error-box p {
  color:inherit;
  margin-bottom:14px;
}
.score-card {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.score {
  font-size:52px;
  line-height:1.2;
  letter-spacing:-2px;
  font-weight:750;
  color:var(--ink);
  margin:10px 0;
}
.score-ring {
  display:grid;
  place-content:center;
  width:120px;
  height:120px;
  flex-shrink:0;
  border-radius:50%;
  background:conic-gradient(var(--accent) var(--score),var(--tint) 0);
  position:relative;
}
.score-ring:before {
  content:"";
  position:absolute;
  inset:9px;
  border-radius:50%;
  background:white;
}
.score-ring strong {
  z-index:1;
  font-size:26px;
}
.stats-grid {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
  margin:18px 0 24px;
}
.stat {
  padding:20px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:14px;
}
.stat strong {
  display:block;
  font-size:28px;
  line-height:1.3;
  letter-spacing:-.6px;
}
.stat span {
  font-size:12px;
  color:var(--muted);
}
.topic-row {
  padding:18px 0;
  border-bottom:1px solid var(--line);
}
.topic-row:last-child {
  border:0;
  padding-bottom:0;
}
.topic-row .section-top {
  margin-bottom:9px;
}
.topic-row small {
  color:var(--muted);
}
.weak-note {
  color:var(--accent);
  font-size:12px;
  margin-top:7px;
}
.segmented {
  display:flex;
  gap:6px;
  padding:5px;
  border-radius:12px;
  background:#edf0f6;
  margin-bottom:24px;
}
.segmented a {
  flex:1;
  padding:10px;
  text-align:center;
  font-size:13px;
  color:var(--muted);
  border-radius:9px;
  font-weight:650;
}
.segmented a[aria-current] {
  background:white;
  color:var(--accent);
  box-shadow:0 1px 4px #17254108;
}
.wrong-card h3 {
  margin:12px 0;
}
.wrong-card p {
  font-size:14px;
}
.wrong-card time {
  font-size:12px;
  color:var(--muted);
}
.wrong-card .button {
  margin-top:16px;
}
.admin-nav {
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin-bottom:24px;
}
.admin-nav button {
  background:transparent;
  color:var(--muted);
  font-size:13px;
  padding:10px 14px;
}
.admin-nav button.active {
  background:var(--ink);
  color:white;
}
.admin-stats {
  grid-template-columns:repeat(4,1fr);
}
.question-row {
  display:flex;
  gap:20px;
  justify-content:space-between;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.question-row:last-child {
  border:0;
}
.question-row h3 {
  font-size:16px;
  margin:8px 0;
  overflow-wrap:anywhere;
}
.question-row>div:first-child {
  min-width:0;
}
.question-row .actions {
  flex-shrink:0;
  align-self:center;
  margin:0;
}
.question-row button {
  font-size:12px;
  padding:8px 12px;
  min-height:44px;
}
.toast {
  position:fixed;
  z-index:30;
  bottom:110px;
  left:50%;
  transform:translateX(-50%);
  width:max-content;
  max-width:calc(100% - 32px);
  border-radius:12px;
  background:var(--ink);
  color:white;
  padding:13px 22px;
  font-size:14px;
  box-shadow:0 5px 24px #17254120;
}
dialog {
  color:var(--ink);
  border:1px solid var(--line);
  border-radius:20px;
  padding:28px;
  width:min(440px,calc(100% - 32px));
  max-height:85vh;
}
dialog::backdrop {
  background:#17254166;
}
dialog h2 {
  margin:10px 0;
}
dialog .actions button {
  min-width:120px;
}
.skip-link {
  position:fixed;
  left:10px;
  top:-100px;
  z-index:100;
  background:white;
  padding:12px;
}
.skip-link:focus {
  top:10px;
}
.sr-only {
  position:absolute;
  width:1px;
  height:1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
}
@media(max-width:600px) {
  .topbar {
    padding:20px 20px;
    padding-top:max(20px,env(safe-area-inset-top),var(--tg-safe-area-inset-top,0px));
  }
  .profile #identity {
    max-width:90px;
    overflow:hidden;
    text-overflow:ellipsis;
    white-space:nowrap;
  }
  .avatar {
    display:none;
  }
  .shell {
    margin:8px auto 0;
    padding:0 18px 130px;
  }
  .page-heading {
    margin:24px 0;
  }
  .page-heading p {
    font-size:14px;
  }
  .card {
    padding:22px 18px;
    border-radius:17px;
  }
  .filter-grid {
    grid-template-columns:1fr 1fr;
  }
  .filter-grid label:first-child {
    grid-column:1/-1;
  }
  .form-grid {
    grid-template-columns:1fr;
    gap:0;
  }
  .question-text {
    font-size:21px;
  }
  .option {
    gap:10px;
    padding:13px 11px;
  }
  .section-top {
    gap:8px;
  }
  .section-top h2 {
    font-size:18px;
  }
  .pill {
    font-size:10px;
  }
  .stats-grid {
    gap:8px;
  }
  .stat {
    padding:14px 10px;
  }
  .stat strong {
    font-size:25px;
  }
  .stat span {
    font-size:11px;
  }
  .score-ring {
    width:98px;
    height:98px;
  }
  .score {
    font-size:44px;
  }
  .admin-stats {
    grid-template-columns:repeat(2,1fr);
  }
  .question-row {
    flex-direction:column;
    gap:12px;
  }
  .question-row .actions {
    align-self:stretch;
  }
  .admin-nav {
    gap:5px;
  }
  .admin-nav button {
    padding:8px 10px;
  }
  .feedback {
    padding:16px;
  }
  .actions .button {
    min-width:140px;
  }
}
@media(prefers-reduced-motion:reduce) {
  * {
    transition:none!important;
    scroll-behavior:auto!important;
  }
}
/* Telegram controls and phone cutouts must not cover navigation. */
.bottom-nav {
  margin-bottom:max(env(safe-area-inset-bottom),var(--tg-safe-area-inset-bottom,0px),var(--tg-content-safe-area-inset-bottom,0px));
}
.topbar {
  padding-top:calc(max(20px,env(safe-area-inset-top),var(--tg-safe-area-inset-top,0px)) + var(--tg-content-safe-area-inset-top,0px));
}
@media(max-width:360px) {
  .score-card {
    gap:12px;
  }
  .score {
    font-size:36px;
  }
  .score-ring {
    width:84px;
    height:84px;
  }
  .brand {
    gap:8px;
  }
  .brand small {
    font-size:8px;
    letter-spacing:1px;
  }
  .profile #identity {
    max-width:65px;
  }
}