:root {
  --text: #6b6375;
  --text-h: #08060d;
  --bg: #fff;
  --card-bg: #f8f7f9;
  --border: #e5e4e7;
  --accent: #7c3aed;
  --accent-light: rgba(124, 58, 237, 0.1);
  --success: #16a34a;
  --error: #dc2626;
  --shadow: rgba(0, 0, 0, 0.08) 0 4px 12px;

  --sans: -apple-system, 'Segoe UI', system-ui, Roboto, sans-serif;
  --mono: ui-monospace, Consolas, monospace;

  font: 16px/1.5 var(--sans);
  color-scheme: light dark;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #9ca3af;
    --text-h: #f3f4f6;
    --bg: #0f0f13;
    --card-bg: #1a1b23;
    --border: #2e303a;
    --accent: #a78bfa;
    --accent-light: rgba(167, 139, 250, 0.15);
    --shadow: rgba(0, 0, 0, 0.4) 0 4px 12px;
  }
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: 100dvh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  overscroll-behavior: none;
  -webkit-overflow-scrolling: touch;
  touch-action: manipulation;
}

#app {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
  padding: 0;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
}

.app-header {
  padding: 1.5rem 1.25rem 0.5rem;
  padding-top: calc(1.5rem + env(safe-area-inset-top));
  text-align: center;
}

.app-header h1 {
  font-family: var(--sans);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-h);
  margin: 0;
  letter-spacing: -0.5px;
}

.app-header p {
  font-size: 0.9rem;
  color: var(--text);
  margin: 0.25rem 0 0;
}

.app-content {
  flex: 1;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 0 0.75rem;
}

.sync-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sync-input-group input {
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text-h);
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}

.sync-input-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.sync-buttons {
  display: flex;
  gap: 0.5rem;
}

.btn {
  flex: 1;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--text-h);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
}

.btn:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.btn:active {
  transform: scale(0.97);
  opacity: 0.9;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.status-bar {
  text-align: center;
  font-size: 0.85rem;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  background: var(--accent-light);
  color: var(--text);
  margin-top: auto;
  min-height: 36px;
}

.status-bar.error {
  background: rgba(220, 38, 38, 0.1);
  color: var(--error);
}

.status-bar.success {
  background: rgba(22, 163, 74, 0.1);
  color: var(--success);
}

.app-footer {
  padding: 1rem 1.25rem;
  padding-bottom: calc(1rem + env(safe-area-inset-bottom));
  text-align: center;
  font-size: 0.75rem;
  color: var(--text);
  opacity: 0.6;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.25rem 0;
}

.placeholder-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text);
  opacity: 0.4;
  font-size: 0.85rem;
  gap: 0.5rem;
  min-height: 100px;
}

.word-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.word-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  box-shadow: var(--shadow);
  transition: border-color 0.2s;
}

.word-item:hover {
  border-color: var(--accent);
}

.word-item-empty {
  align-items: center;
  text-align: center;
  color: var(--text);
  opacity: 0.6;
  font-size: 0.9rem;
  padding: 24px 16px;
}

.word-key {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-h);
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.word-value {
  font-size: 0.95rem;
  color: var(--text);
  flex: 1;
  text-align: right;
}

.word-tags {
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-light);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
  flex-basis: 100%;
  order: 1;
  align-self: flex-start;
  margin-top: 2px;
}

.placeholder-icon {
  font-size: 2rem;
  opacity: 0.6;
}

/* ──── Группировка слов (табы) ──── */

.group-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.group-tabs::-webkit-scrollbar {
  display: none;
}

.group-tab {
  flex: 1;
  min-width: 0;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.65rem 0.5rem;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.group-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: var(--accent-light);
}

.group-tab-count {
  font-size: 0.7rem;
  background: var(--accent-light);
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 8px;
  font-weight: 500;
  margin-left: auto;
}

.group-panel {
  display: none;
  padding-top: 0.75rem;
}

.group-panel.active {
  display: block;
}

.word-tag-block {
  margin-bottom: 0.5rem;
}

.word-tag-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  border-radius: 8px;
  transition: background 0.15s;
}

.word-tag-header:hover {
  background: var(--accent-light);
}

.word-tag-header::after {
  content: '▸';
  font-size: 0.75rem;
  color: var(--text);
  transition: transform 0.2s;
}

.word-tag-header.collapsed::after {
  transform: rotate(90deg);
}

.word-tag-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
}

.word-tag-count {
  font-size: 0.75rem;
  color: var(--text);
  background: var(--accent-light);
  padding: 1px 8px;
  border-radius: 10px;
}

.word-tag-words {
  padding: 0.25rem 0 0.25rem 0.5rem;
}

.word-tag-words .word-item {
  margin-bottom: 6px;
  padding: 10px 12px;
}

.word-tag-words .word-item:last-child {
  margin-bottom: 0;
}

/* ──── Навигация ──── */

.app-nav {
  display: flex;
  border-top: 1px solid var(--border);
  background: var(--card-bg);
  position: sticky;
  bottom: 0;
  z-index: 10;
  padding-bottom: env(safe-area-inset-bottom);
}

.nav-btn {
  flex: 1;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.75rem 0.5rem;
  min-height: 52px;
  border: none;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.nav-btn.active {
  color: var(--accent);
  background: var(--accent-light);
}

.nav-btn:hover {
  color: var(--accent);
}

/* ──── Страница колод ──── */

.sets-layout {
  display: flex;
  gap: 0;
  flex: 1;
  min-height: 0;
}

.sets-list {
  flex: 1;
  list-style: none;
  padding: 0;
  margin: 0;
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.sets-list li {
  padding: 14px 14px;
  min-height: 48px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
  font-weight: 500;
  color: var(--text-h);
  -webkit-tap-highlight-color: transparent;
}

.sets-list li:last-child {
  border-bottom: none;
}

.sets-list li:hover {
  background: var(--accent-light);
}

.sets-list li.selected {
  background: var(--accent-light);
  color: var(--accent);
}

.sets-detail {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
}

.sets-detail h3 {
  margin: 0 0 12px;
  font-size: 1rem;
  color: var(--text-h);
}

.sets-detail p {
  margin: 0 0 6px;
  font-size: 0.85rem;
  color: var(--text);
}

.sets-detail .mode-select {
  width: 100%;
  margin: 10px 0;
  padding: 10px;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text-h);
  font-size: 0.9rem;
}

.sets-detail .btn {
  width: 100%;
  margin-top: 8px;
}

@media (max-width: 400px) {
  .sets-layout {
    flex-direction: column;
  }
  .sets-list {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 200px;
  }
}

/* ──── Страница тренировки ──── */

.training-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
}

.training-card {
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 200px;
}

.training-content {
  text-align: center;
}

.training-field {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-h);
  padding: 0.5rem 0;
  line-height: 1.4;
}

.training-side {
  padding: 0.5rem 0;
}

.training-side-back .training-field {
  color: var(--accent);
  font-weight: 500;
}

.training-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.75rem 0;
}

.training-score {
  font-size: 0.85rem;
  color: var(--accent);
  margin-top: 0.75rem;
  font-weight: 500;
  opacity: 0.8;
}

/* ──── Просмотр слова ──── */

.word-view-header {
  padding: 0.5rem 0;
}

.word-view-card {
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.word-view-section {
  padding: 0.25rem 0;
}

.word-view-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

.word-view-field {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-h);
  padding: 0.25rem 0;
  line-height: 1.4;
}

.word-view-field-back {
  color: var(--accent);
}

.word-view-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.75rem 0;
}

.word-view-more-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  gap: 8px;
}

.word-view-more-key {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text);
  flex-shrink: 0;
}

.word-view-more-value {
  font-size: 0.9rem;
  color: var(--text-h);
  text-align: right;
  word-break: break-word;
}

.word-view-actions {
  padding: 0.75rem 0;
}

.training-actions {
  padding: 0.75rem 0;
}

.training-vote {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.vote-btn {
  font-size: 0.85rem;
  padding: 0.75rem 0.5rem;
  min-height: 52px;
}

.vote-easy {
  border-color: #16a34a;
  color: #16a34a;
}

.vote-ok {
  border-color: #ca8a04;
  color: #ca8a04;
}

.vote-hard {
  border-color: #ea580c;
  color: #ea580c;
}

.vote-none {
  border-color: #dc2626;
  color: #dc2626;
}

@media (prefers-color-scheme: dark) {
  .vote-easy { color: #4ade80; border-color: #4ade80; }
  .vote-ok { color: #facc15; border-color: #facc15; }
  .vote-hard { color: #fb923c; border-color: #fb923c; }
  .vote-none { color: #f87171; border-color: #f87171; }
}