:root {
  color-scheme: dark;
  --bg: #17212b;
  --surface: #1f2c39;
  --surface-2: #263646;
  --surface-3: #2d4053;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(114, 190, 255, 0.34);
  --text: #eef6ff;
  --muted: #8fa2b6;
  --muted-2: #bfccd8;
  --blue: #2aabee;
  --blue-soft: rgba(42, 171, 238, 0.14);
  --cyan: #55d5ff;
  --danger: #ef6b70;
  --warning: #e6ad5c;
  --success: #53d18f;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

input,
button,
[data-collection-id],
.card-switch,
.due-preview,
.word-row,
.back-btn,
.collection-row,
.nav-btn {
  cursor: pointer;
}

input {
  cursor: text;
}

button:disabled {
  cursor: wait;
  opacity: 0.72;
}

button {
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.app-shell {
  position: relative;
  width: min(100%, 430px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 22px 16px 110px;
  background:
    linear-gradient(180deg, rgba(42, 171, 238, 0.05), transparent 180px),
    var(--bg);
}

.topbar,
.xp-line,
.session-head,
.card-meta,
.collection-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.topbar {
  margin-bottom: 18px;
}

.brand-label {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 30px;
  line-height: 1.05;
  font-weight: 620;
  letter-spacing: 0;
}

.status-badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 12px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted-2);
  font-size: 13px;
  font-weight: 500;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.xp-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--surface);
}

.daily-tracker {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px 16px;
  background: var(--surface);
}

.tracker-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.tracker-label {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card-switch {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 11px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted-2);
  font-size: 13px;
  font-weight: 520;
}

.card-switch i {
  width: 28px;
  height: 17px;
  position: relative;
  display: inline-block;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
}

.card-switch i::after {
  content: "";
  width: 11px;
  height: 11px;
  position: absolute;
  top: 3px;
  left: 3px;
  border-radius: 50%;
  background: #fff;
  transition: transform 150ms ease;
}

.card-switch.active {
  border-color: var(--line-strong);
  color: var(--cyan);
}

.card-switch.active i {
  background: var(--success);
}

.card-switch.active i::after {
  transform: translateX(11px);
}

.tracker-main {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.tracker-main strong {
  font-size: 54px;
  line-height: 0.9;
  font-weight: 620;
}

.tracker-main span {
  color: var(--muted-2);
  font-size: 18px;
  font-weight: 520;
}

.tracker-summary {
  margin: 14px 0 24px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.45;
}

.tracker-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.tracker-btn {
  margin-top: 18px;
}

.tracker-stats span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.tracker-stats strong {
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}

.dot {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border-radius: 999px;
}

.mastered-dot {
  background: var(--success);
}

.learning-dot {
  background: var(--blue);
}

.retention-dot {
  background: #8f67ff;
}

.xp-line,
.session-head {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 13px;
}

.xp-line strong {
  color: var(--muted-2);
  font-weight: 520;
}

.meter {
  width: 100%;
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}

.meter span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transition: width 180ms ease;
}

.collection-list {
  display: grid;
  gap: 12px;
  margin: 14px 0 18px;
}

.collection-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--surface);
  transition: border-color 150ms ease, background 150ms ease, transform 150ms ease;
}

.collection-row:active {
  transform: scale(0.995);
}

.collection-row.selected {
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(42, 171, 238, 0.08), rgba(255, 255, 255, 0.02)), var(--surface);
}

.collection-head {
  margin-bottom: 10px;
}

.collection-actions {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted-2);
}

.icon-btn .icon {
  width: 17px;
  height: 17px;
}

.icon-btn:active {
  background: rgba(255, 255, 255, 0.08);
}

.danger-btn {
  color: var(--muted);
}

.danger-btn:active {
  border-color: rgba(239, 107, 112, 0.45);
  background: rgba(239, 107, 112, 0.14);
  color: var(--danger);
}

.collection-row h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 560;
}

.collection-status {
  display: block;
  margin-bottom: 8px;
  color: var(--muted-2);
  font-size: 14px;
  font-weight: 500;
}

.due-line {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 13px;
}

.due-preview {
  width: 100%;
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--text);
}

.due-preview strong,
.due-preview em {
  display: block;
}

.due-preview strong {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 520;
}

.due-preview em {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
}

.muted-preview {
  opacity: 0.72;
}

.primary-btn,
.ghost-btn,
.group-form button {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-radius: 8px;
  font-weight: 600;
}

.primary-btn,
.group-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  background: var(--blue);
  color: white;
}

.primary-btn:active,
.group-form button:active {
  background: #2399d6;
}

.ghost-btn {
  margin-top: 10px;
  background: transparent;
  color: var(--blue);
}

.group-form {
  display: grid;
  grid-template-columns: 1fr 94px;
  gap: 10px;
  margin-bottom: 16px;
}

.group-form input {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 13px;
  color: var(--text);
  background: var(--surface);
}

.group-form input::placeholder {
  color: var(--muted);
}

.practice-view {
  padding-top: 2px;
}

.flashcard {
  min-height: min(62vh, 520px);
  display: flex;
  flex-direction: column;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--surface);
  text-align: center;
}

.pill {
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--cyan);
  font-size: 12px;
  font-weight: 600;
}

.subtle,
.pronunciation,
.example,
.synonyms,
.uzbek {
  color: var(--muted);
}

.flashcard h2 {
  margin: auto 0 8px;
  font-size: clamp(34px, 11vw, 48px);
  line-height: 1.08;
  font-weight: 620;
}

.pronunciation {
  min-height: 22px;
  margin-bottom: auto;
  font-size: 15px;
}

.answer-panel {
  margin: 18px 0 24px;
  text-align: left;
}

.definition {
  margin-bottom: 14px;
  font-size: 21px;
  line-height: 1.35;
  font-weight: 560;
}

.example,
.synonyms,
.uzbek {
  margin-bottom: 10px;
  line-height: 1.45;
}

.reveal-btn {
  margin-top: 16px;
}

.grade-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 16px;
}

.grade-grid button {
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
}

.grade-grid [data-grade="again"] {
  color: var(--danger);
}

.grade-grid [data-grade="hard"] {
  color: var(--warning);
}

.grade-grid [data-grade="good"],
.grade-grid [data-grade="easy"] {
  color: var(--success);
}

.complete-view {
  padding-top: 54px;
  text-align: center;
}

.complete-view h2 {
  margin-bottom: 8px;
  color: var(--cyan);
  font-size: 44px;
  font-weight: 620;
}

.stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 30px 0 22px;
}

.stats-row div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 8px;
  background: var(--surface);
}

.stats-row strong,
.stats-row span {
  display: block;
}

.stats-row strong {
  font-size: 22px;
}

.stats-row span {
  color: var(--muted);
  font-size: 12px;
}

.wide {
  margin-bottom: 24px;
}

.stats-view {
  padding-top: 2px;
}

.stats-head {
  margin-bottom: 16px;
}

.stats-summary-card,
.stats-detail-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.stats-summary-card {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  margin-bottom: 12px;
}

.stats-summary-card > div {
  min-height: 102px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 16px;
  background: rgba(255, 255, 255, 0.018);
}

.stat-label {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

.stats-summary-card strong {
  font-size: 30px;
  line-height: 1;
  font-weight: 620;
}

.stats-detail-card {
  padding: 16px;
}

.bottom-nav {
  position: fixed;
  left: 50%;
  bottom: 0;
  z-index: 20;
  width: min(100%, 430px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  border-top: 1px solid var(--line);
  padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
  background: rgba(23, 33, 43, 0.96);
  transform: translateX(-50%);
  backdrop-filter: blur(18px);
}

.nav-btn {
  min-width: 0;
  min-height: 58px;
  border: 0;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-weight: 560;
}

.nav-btn .icon {
  width: 20px;
  height: 20px;
}

.nav-btn.active {
  background: var(--blue-soft);
  color: var(--cyan);
}

.nav-btn:active {
  background: rgba(42, 171, 238, 0.18);
}

.icon {
  width: 18px;
  height: 18px;
  display: inline-block;
  flex: 0 0 auto;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.words-view {
  padding-top: 2px;
}

.back-btn {
  width: auto;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
  border: 0;
  border-radius: 8px;
  padding: 0 10px 0 2px;
  background: transparent;
  color: var(--blue);
  font-weight: 520;
}

.words-head {
  margin-bottom: 16px;
}

.words-list {
  display: grid;
  gap: 10px;
}

.word-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  background: var(--surface);
}

.word-row h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 560;
}

.word-row p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.word-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.word-actions span {
  color: var(--muted-2);
  font-size: 12px;
  white-space: nowrap;
}

.empty-state {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--surface);
  color: var(--muted);
  text-align: center;
}

.error-state {
  margin-top: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--surface);
}

.error-state h2 {
  margin-bottom: 10px;
  font-size: 22px;
}

.error-state p {
  color: var(--muted);
  line-height: 1.5;
}

.error-state code {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--surface-2);
}

.app-shell.external-only {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

.app-shell.external-only .topbar,
.app-shell.external-only .bottom-nav {
  display: none;
}

.app-shell.external-only .view.active {
  width: 100%;
}

.telegram-open-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px 18px;
  background: var(--surface);
  text-align: center;
}

.telegram-open-card h1 {
  margin-bottom: 12px;
  font-size: 28px;
}

.telegram-open-card p:not(.brand-label) {
  margin-bottom: 22px;
  color: var(--muted);
  line-height: 1.5;
}

.telegram-open-icon {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--cyan);
}

.telegram-open-icon .icon {
  width: 24px;
  height: 24px;
}

.open-telegram-btn {
  text-decoration: none;
}

.muted {
  color: var(--muted);
}

@media (max-width: 380px) {
  .grade-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}