/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg1:     #0f172a;
  --bg:      #0f172a;
  --bg2:     #1e293b;
  --bg3:     #334155;
  --border:  #334155;
  --accent:  #6366f1;
  --accent2: #818cf8;
  --primary: #6366f1;
  --success: #22c55e;
  --danger:  #ef4444;
  --warning: #f59e0b;
  --text1:   #f1f5f9;
  --text:    #f1f5f9;
  --text2:   #94a3b8;
  --radius:  14px;
  --shadow:  0 4px 24px rgba(0,0,0,.4);
}

html { font-size: 16px; }
body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ===== HEADER ===== */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  background: var(--bg2);
  border-bottom: 1px solid var(--bg3);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,.3);
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent2);
  letter-spacing: -.5px;
}

nav { display: flex; gap: .5rem; }

/* ===== SPRACH-UMSCHALTER ===== */
.lang-switch {
  display: flex;
  gap: 2px;
  background: var(--bg3);
  border-radius: 10px;
  padding: 3px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text2);
  padding: .35rem .75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: .85rem;
  font-weight: 600;
  transition: background .2s, color .2s;
  white-space: nowrap;
}

.lang-btn.active {
  background: var(--accent);
  color: #fff;
}

.lang-btn:not(.active):hover {
  background: var(--bg2);
  color: var(--text);
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--text2);
  padding: .5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: .9rem;
  font-weight: 500;
  transition: all .2s;
}
.nav-btn:hover { background: var(--bg3); color: var(--text); }
.nav-btn.active { background: var(--accent); color: #fff; }

/* ===== MAIN ===== */
main { max-width: 860px; margin: 0 auto; padding: 2rem 1rem; }

.view { display: none; }
.view.active { display: block; }
.hidden { display: none !important; }

.view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.view-header h2 { font-size: 1.5rem; font-weight: 700; }

/* ===== CARD ===== */
.card {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}
.card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; color: var(--text2); }

/* ===== BUTTONS ===== */
button { cursor: pointer; font-family: inherit; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: .6rem 1.4rem;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 600;
  transition: background .2s, transform .1s;
}
.btn-primary:hover { background: var(--accent2); }
.btn-primary:active { transform: scale(.97); }

.btn-secondary {
  background: var(--bg3);
  color: var(--text);
  border: none;
  padding: .6rem 1.2rem;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 500;
  transition: background .2s;
  display: inline-block;
  text-align: center;
}
.btn-secondary:hover { background: #475569; }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  padding: .6rem 1.2rem;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 500;
  transition: background .2s;
}
.btn-danger:hover { background: rgba(239,68,68,.1); }

/* ===== PROGRESS BAR ===== */
.progress-bar-wrap {
  background: var(--bg3);
  border-radius: 99px;
  height: 6px;
  margin-bottom: .75rem;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 99px;
  transition: width .4s ease;
  width: 0%;
}

.counter { text-align: center; color: var(--text2); font-size: .85rem; margin-bottom: 1.5rem; }

/* ===== CARD LABEL ===== */
.card-label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent2);
  font-weight: 600;
}

/* ===== FLASHCARD SIMPLE (Eingabe-Modus) ===== */
.flashcard-simple {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  text-align: center;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  min-height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.flashcard-simple p {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
}

/* ===== LEARN INPUT AREA ===== */
.learn-input-area {
  display: flex;
  gap: .75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
#learn-answer-input {
  flex: 1;
  min-width: 200px;
  background: var(--bg3);
  border: 2px solid #475569;
  color: var(--text);
  padding: .7rem 1rem;
  border-radius: 10px;
  font-size: 1.1rem;
  outline: none;
  transition: border-color .2s;
}
#learn-answer-input:focus { border-color: var(--accent); }
#learn-answer-input.input-correct { border-color: var(--success); background: rgba(34,197,94,.1); }
#learn-answer-input.input-wrong   { border-color: var(--danger);  background: rgba(239,68,68,.1); }
#learn-answer-input.input-typo    { border-color: var(--warning); background: rgba(245,158,11,.1); }

/* ===== LEARN FEEDBACK ===== */
.learn-feedback {
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.learn-feedback.fb-correct {
  background: rgba(34,197,94,.12);
  border: 1px solid var(--success);
}
.learn-feedback.fb-wrong {
  background: rgba(239,68,68,.12);
  border: 1px solid var(--danger);
}
.learn-feedback.fb-typo {
  background: rgba(245,158,11,.12);
  border: 1px solid var(--warning);
}
#learn-feedback-text {
  font-size: 1.1rem;
  font-weight: 700;
}
.learn-feedback.fb-correct #learn-feedback-text { color: var(--success); }
.learn-feedback.fb-wrong   #learn-feedback-text { color: var(--danger); }
.learn-feedback.fb-typo    #learn-feedback-text { color: var(--warning); }
.feedback-correct-answer {
  font-size: .95rem;
  color: var(--text2);
}

/* ===== SKIP BUTTON ===== */
.btn-skip {
  border: none;
  padding: .7rem 1.4rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  transition: all .2s;
  background: var(--bg3);
  color: var(--text2);
}
.btn-skip:hover { background: #475569; }

/* ===== SESSION DONE ===== */
.session-done {
  text-align: center;
  padding: 3rem 2rem;
  background: var(--bg2);
  border-radius: var(--radius);
  border: 1px solid var(--bg3);
}
.done-icon { font-size: 3rem; margin-bottom: 1rem; }
.session-done h3 { font-size: 1.5rem; margin-bottom: .5rem; }
.session-done p { color: var(--text2); margin-bottom: 1.5rem; font-size: 1.05rem; }
.session-done button { margin: .3rem; }

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text2);
}
.empty-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state p { margin-bottom: 1.5rem; font-size: 1.05rem; }

/* ===== DECK SELECTOR ===== */
.deck-selector select {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  color: var(--text);
  padding: .4rem .8rem;
  border-radius: 8px;
  font-size: .9rem;
  outline: none;
  cursor: pointer;
}

.deck-selector {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  align-items: center;
}

.inline-controls {
  display: flex;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.card-lite {
  background: rgba(51, 65, 85, .45);
  border: 1px solid var(--bg3);
  border-radius: 10px;
  padding: .65rem .85rem;
}

.toggle-inline {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: .85rem;
  color: var(--text2);
}

.toggle-inline.compact {
  font-size: .8rem;
}

.tiny-note {
  color: var(--text2);
  font-size: .8rem;
}

/* ===== QUIZ ===== */
.quiz-card {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.quiz-question-label {
  font-size: .85rem;
  color: var(--text2);
  margin-bottom: .75rem;
}

.quiz-word {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text);
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
}

.quiz-option {
  background: var(--bg3);
  border: 1px solid #475569;
  color: var(--text);
  padding: 1rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 500;
  transition: all .15s;
  text-align: left;
}
.quiz-option:hover:not(:disabled) { background: #475569; border-color: var(--accent2); }
.quiz-option.correct { background: rgba(34,197,94,.2); border-color: var(--success); color: var(--success); }
.quiz-option.wrong   { background: rgba(239,68,68,.2);  border-color: var(--danger);  color: var(--danger); }
.quiz-option:disabled { cursor: default; }

.quiz-feedback {
  margin-top: 1rem;
  padding: .75rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: .95rem;
}
.quiz-feedback.ok  { background: rgba(34,197,94,.15);  color: var(--success); border: 1px solid var(--success); }
.quiz-feedback.err { background: rgba(239,68,68,.15);  color: var(--danger);  border: 1px solid var(--danger); }

.quiz-confidence {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: 1rem;
  color: var(--text2);
  font-size: .85rem;
}

.quiz-confidence select {
  background: var(--bg3);
  border: 1px solid #475569;
  color: var(--text);
  padding: .35rem .6rem;
  border-radius: 8px;
}

/* ===== MANAGE ===== */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: .75rem;
  margin-bottom: 1rem;
}
.form-group { display: flex; flex-direction: column; gap: .3rem; }
.form-group label { font-size: .8rem; color: var(--text2); font-weight: 500; }
.form-group input {
  background: var(--bg3);
  border: 1px solid #475569;
  color: var(--text);
  padding: .55rem .8rem;
  border-radius: 8px;
  font-size: .95rem;
  outline: none;
  transition: border-color .2s;
}
.form-group input:focus { border-color: var(--accent); }
.form-group select {
  background: var(--bg3);
  border: 1px solid #475569;
  color: var(--text);
  padding: .55rem .8rem;
  border-radius: 8px;
  font-size: .95rem;
  outline: none;
}
.form-group select:focus { border-color: var(--accent); }
.form-span-2 { grid-column: span 2; }

.tool-row { display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; }

.file-label {
  cursor: pointer;
  user-select: none;
}
.file-label input[type="file"] { display: none; }

.list-header {
  display: flex;
  gap: .75rem;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
#search-input {
  background: var(--bg3);
  border: 1px solid #475569;
  color: var(--text);
  padding: .5rem .9rem;
  border-radius: 8px;
  font-size: .9rem;
  outline: none;
  flex: 1;
  min-width: 150px;
}
#search-input:focus { border-color: var(--accent); }
#filter-category {
  background: var(--bg3);
  border: 1px solid #475569;
  color: var(--text);
  padding: .5rem .8rem;
  border-radius: 8px;
  font-size: .9rem;
  outline: none;
}
.vocab-count { font-size: .8rem; color: var(--text2); white-space: nowrap; }

/* Vocab list items */
.vocab-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem 0;
  border-bottom: 1px solid var(--bg3);
}
.vocab-item:last-child { border-bottom: none; }

.vocab-word  { font-weight: 600; flex: 1; }
.vocab-trans { color: var(--text2); flex: 1; }
.vocab-cat   {
  font-size: .75rem;
  background: rgba(99,102,241,.2);
  color: var(--accent2);
  padding: .2rem .6rem;
  border-radius: 99px;
  white-space: nowrap;
}
.vocab-stars { font-size: .8rem; color: var(--warning); white-space: nowrap; }
.vocab-del {
  background: transparent;
  border: none;
  color: var(--text2);
  font-size: 1.1rem;
  padding: .2rem .5rem;
  border-radius: 6px;
  transition: color .15s;
}
.vocab-del:hover { color: var(--danger); }

/* ===== STATS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--bg2);
  border: 1px solid var(--bg3);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}
.stat-value { font-size: 2.5rem; font-weight: 700; color: var(--accent2); line-height: 1; margin-bottom: .4rem; }
.stat-label { font-size: .8rem; color: var(--text2); }

.stats-vocab-list { max-height: 400px; overflow-y: auto; }
.stats-vocab-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .6rem 0;
  border-bottom: 1px solid var(--bg3);
}
.stats-vocab-item:last-child { border-bottom: none; }
.svl-word  { flex: 1; font-weight: 500; }
.svl-trans { flex: 1; color: var(--text2); font-size: .9rem; }
.svl-bar-wrap { width: 100px; background: var(--bg3); border-radius: 99px; height: 6px; overflow: hidden; }
.svl-bar { height: 100%; background: var(--accent); border-radius: 99px; transition: width .4s; }
.svl-score { font-size: .8rem; color: var(--text2); white-space: nowrap; width: 60px; text-align: right; }

.goal-wrap {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.goal-inputs {
  display: flex;
  gap: .65rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.goal-inputs label {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  font-size: .84rem;
  color: var(--text2);
}

.goal-inputs input {
  width: 120px;
  background: var(--bg3);
  border: 1px solid #475569;
  color: var(--text);
  padding: .45rem .65rem;
  border-radius: 8px;
}

.goal-rings {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.goal-ring-card {
  text-align: center;
  color: var(--text2);
  font-size: .8rem;
}

.goal-ring {
  --pct: 0;
  width: 78px;
  height: 78px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(closest-side, var(--bg2) 72%, transparent 73% 100%),
    conic-gradient(var(--accent2) calc(var(--pct) * 1%), var(--bg3) 0);
  border: 1px solid var(--bg3);
}

.goal-ring span {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text);
}

.stats-heatmap {
  display: grid;
  grid-template-columns: repeat(14, minmax(20px, 1fr));
  gap: .35rem;
}

.heat-cell {
  height: 20px;
  border-radius: 6px;
  border: 1px solid var(--bg3);
}

.stats-trend {
  display: flex;
  gap: .35rem;
  align-items: flex-end;
  min-height: 120px;
}

.trend-bar {
  flex: 1;
  min-width: 18px;
  border-radius: 7px 7px 0 0;
  background: linear-gradient(180deg, var(--accent2), var(--accent));
  position: relative;
}

.trend-bar span {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  font-size: .7rem;
  color: var(--text2);
  margin-bottom: .2rem;
}

/* ===== CONJUGATION ===== */
.conj-card { padding: 1.75rem; }

.conj-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: .5rem;
}

.conj-infinitive {
  font-size: 1.7rem;
  font-weight: 700;
  margin-right: .5rem;
}

.conj-translation {
  font-size: 1rem;
  color: var(--text2);
}

.conj-tense-badge {
  font-size: .78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--accent2);
  background: rgba(99,102,241,.15);
  border: 1px solid rgba(99,102,241,.35);
  padding: .25rem .75rem;
  border-radius: 99px;
  white-space: nowrap;
}

.conj-table {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  margin-bottom: 1.25rem;
}

.conj-row {
  display: grid;
  grid-template-columns: 90px 1fr 28px auto;
  align-items: center;
  gap: .5rem;
}

.conj-pronoun {
  font-size: .9rem;
  color: var(--text2);
  font-style: italic;
  text-align: right;
}

.conj-input {
  background: var(--bg3);
  border: 1.5px solid #475569;
  color: var(--text);
  padding: .45rem .75rem;
  border-radius: 8px;
  font-size: .95rem;
  outline: none;
  transition: border-color .15s;
  width: 100%;
}
.conj-input:focus   { border-color: var(--accent); }
.conj-input:disabled { opacity: .85; cursor: default; }
.conj-input.conj-correct { border-color: var(--success); background: rgba(34,197,94,.1); }
.conj-input.conj-wrong   { border-color: var(--danger);  background: rgba(239,68,68,.1); }

.conj-result-icon {
  font-size: 1rem;
  text-align: center;
}

.conj-correct-form {
  font-size: .82rem;
  color: var(--success);
  font-style: italic;
  white-space: nowrap;
}

.conj-card-feedback {
  margin-bottom: 1rem;
  padding: .65rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: .9rem;
}
.conj-card-feedback.ok      { background: rgba(34,197,94,.15);  color: var(--success); border: 1px solid var(--success); }
.conj-card-feedback.partial { background: rgba(245,158,11,.15); color: var(--warning); border: 1px solid var(--warning); }
.conj-card-feedback.err     { background: rgba(239,68,68,.15);  color: var(--danger);  border: 1px solid var(--danger); }

.conj-actions {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
}

/* Add-verb form pronoun grid */
.conj-add-forms {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: .6rem;
  margin-bottom: 1rem;
}

/* Verb list */
.conj-verb-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .7rem 0;
  border-bottom: 1px solid var(--bg3);
  flex-wrap: wrap;
}
.conj-verb-item:last-child { border-bottom: none; }
.conj-verb-inf   { font-weight: 600; flex: 1; min-width: 100px; }
.conj-verb-trans { color: var(--text2); font-size: .9rem; flex: 1; min-width: 80px; }
.conj-verb-tenses {
  display: flex;
  gap: .35rem;
  flex-wrap: wrap;
}
.conj-tense-chip {
  font-size: .72rem;
  background: rgba(99,102,241,.15);
  color: var(--accent2);
  padding: .15rem .5rem;
  border-radius: 99px;
}

.conj-irregular-chip {
  font-size: .72rem;
  background: rgba(245,158,11,.2);
  color: var(--warning);
  padding: .15rem .5rem;
  border-radius: 99px;
}
.conj-verb-del {
  background: transparent;
  border: none;
  color: var(--text2);
  font-size: 1.1rem;
  padding: .2rem .5rem;
  border-radius: 6px;
  transition: color .15s;
  cursor: pointer;
}
.conj-verb-del:hover { color: var(--danger); }

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
  header { padding: 0 1rem; }
  .logo  { font-size: 1rem; }
  .nav-btn { padding: .4rem .7rem; font-size: .8rem; }
  .form-row { grid-template-columns: 1fr; }
  .quiz-options { grid-template-columns: 1fr; }
  .flashcard { height: 220px; }
  .flashcard-front p, .flashcard-back p { font-size: 1.5rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .form-span-2 { grid-column: span 1; }
  .goal-rings { width: 100%; justify-content: space-between; }
  .stats-heatmap { grid-template-columns: repeat(7, minmax(20px, 1fr)); }
}
/* ===================================================================== 
   MOBILE OPTIMIZATION
   Phase 5: Touch, Bottom Nav, Responsive
   ===================================================================== */

/* ===== BOTTOM NAVIGATION (Mobile) ===== */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg1, #1a1a2e);
  border-top: 1px solid var(--border, #333);
  padding: 0.5rem 0;
  z-index: 1000;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
  padding-bottom: env(safe-area-inset-bottom, 0.5rem);
}

.bottom-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 0.5rem;
  background: none;
  border: none;
  color: var(--text2, #888);
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px;
  -webkit-tap-highlight-color: transparent;
}

.bottom-nav-btn .nav-icon {
  font-size: 1.5rem;
  margin-bottom: 2px;
}

.bottom-nav-btn.active {
  color: var(--primary, #4A90E2);
}

.bottom-nav-btn:active {
  transform: scale(0.95);
}

/* ===== TOUCH SWIPE CARDS ===== */
.flashcard-container {
  position: relative;
  touch-action: pan-y;
  -webkit-user-select: none;
  user-select: none;
}

.flashcard {
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  will-change: transform;
  backface-visibility: hidden;
}

.flashcard.swiping {
  transition: none;
}

.flashcard.swipe-left {
  transform: translateX(-100px) rotate(-10deg);
  box-shadow: -10px 0 30px rgba(255, 100, 100, 0.4);
}

.flashcard.swipe-right {
  transform: translateX(100px) rotate(10deg);
  box-shadow: 10px 0 30px rgba(100, 255, 150, 0.4);
}

.swipe-indicator {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
  font-weight: bold;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  z-index: 10;
}

.swipe-indicator.left {
  left: 20px;
  color: #ff6b6b;
}

.swipe-indicator.right {
  right: 20px;
  color: #4caf50;
}

.flashcard.swipe-left ~ .swipe-indicator.left,
.flashcard.swipe-right ~ .swipe-indicator.right {
  opacity: 0.8;
}

/* Swipe feedback animation */
@keyframes swipeFeedback {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

.swipe-feedback {
  animation: swipeFeedback 0.3s ease;
}

/* ===== RESPONSIVE BREAKPOINTS ===== */

/* Tablet */
@media (max-width: 1024px) {
  :root {
    --header-height: 60px;
  }
  
  header {
    padding: 0 1rem;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  nav {
    gap: 0.3rem;
  }
  
  .nav-btn {
    padding: 0.5rem 0.8rem;
    font-size: 0.85rem;
  }
  
  .header-actions {
    gap: 0.5rem;
  }
}

/* Mobile */
@media (max-width: 768px) {
  /* Hide desktop nav, show bottom nav */
  header > nav {
    display: none;
  }
  
  .bottom-nav {
    display: flex;
  }
  
  /* Adjust main content for bottom nav */
  main {
    padding-bottom: 70px;
    padding-bottom: calc(70px + env(safe-area-inset-bottom, 0px));
  }
  
  /* Header mobile */
  header {
    padding: 0 0.75rem;
    height: 50px;
  }
  
  .logo {
    font-size: 1rem;
  }
  
  .header-actions {
    gap: 0.3rem;
  }
  
  .header-btn {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
  }
  
  .lang-switch {
    display: none;
  }
  
  /* View headers */
  .view-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 1rem 0.75rem;
  }
  
  .view-header h2 {
    font-size: 1.3rem;
    margin: 0;
  }
  
  .deck-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .deck-selector select {
    width: 100%;
    padding: 0.6rem;
    font-size: 0.9rem;
  }
  
  /* Flashcard mobile */
  .flashcard-simple {
    padding: 1.5rem 1rem;
  }
  
  .flashcard-simple p {
    font-size: 1.5rem;
  }
  
  .card-label {
    font-size: 0.9rem;
  }
  
  /* Input area */
  .learn-input-area {
    padding: 1rem 0.75rem;
    gap: 0.5rem;
  }
  
  .learn-input-area input {
    padding: 0.8rem;
    font-size: 1rem;
  }
  
  .learn-input-area button {
    padding: 0.8rem 1.2rem;
    font-size: 0.95rem;
  }
  
  /* Quiz card */
  .quiz-card {
    padding: 1.5rem 1rem;
  }
  
  .quiz-word {
    font-size: 1.5rem;
  }
  
  .quiz-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  /* Form elements */
  .form-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .form-group {
    margin-bottom: 0;
  }
  
  .form-span-2 {
    grid-column: span 1;
  }
  
  /* Manage view */
  .manage-form,
  .manage-tools,
  .manage-list {
    padding: 1rem 0.75rem;
    margin: 0 0.5rem 1rem;
  }
  
  .list-header {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .list-header input,
  .list-header select {
    flex: 1;
    min-width: 120px;
  }
  
  .vocab-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.75rem;
  }
  
  .vocab-word {
    font-size: 1.1rem;
  }
  
  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    padding: 0.5rem;
  }
  
  .stat-card {
    padding: 1rem 0.75rem;
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
  
  /* Modal */
  .modal {
    width: 95%;
    max-height: 90vh;
    margin: 1rem;
    padding: 1rem;
  }
  
  .settings-section {
    padding: 0.75rem 0;
  }
  
  .settings-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  /* Cheatsheet */
  .cheatsheet-grid {
    grid-template-columns: 1fr;
  }
  
  .cheatsheet-item {
    font-size: 0.85rem;
  }
  
  /* Bulk toolbar */
  .bulk-toolbar {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem;
  }
  
  /* Backup section */
  .tool-row {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .tool-row button,
  .tool-row .file-label {
    flex: 1;
    min-width: 140px;
    padding: 0.6rem 0.8rem;
    font-size: 0.85rem;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  :root {
    --header-height: 50px;
  }
  
  .logo {
    font-size: 0.9rem;
  }
  
  .logo::before {
    font-size: 1.2rem;
  }
  
  .header-btn {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }
  
  /* Bottom nav */
  .bottom-nav {
    padding: 0.3rem 0;
  }
  
  .bottom-nav-btn {
    padding: 0.3rem;
  }
  
  .bottom-nav-btn .nav-icon {
    font-size: 1.3rem;
  }
  
  .bottom-nav-btn .nav-label {
    font-size: 0.6rem;
  }
  
  main {
    padding-bottom: 60px;
  }
  
  /* Smaller cards */
  .flashcard-simple p {
    font-size: 1.3rem;
  }
  
  .quiz-word {
    font-size: 1.3rem;
  }
  
  /* Stats */
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }
  
  .stat-value {
    font-size: 1.3rem;
  }
  
  .stat-label {
    font-size: 0.75rem;
  }
  
  /* Goal rings */
  .goal-rings {
    flex-direction: row;
    gap: 1rem;
  }
  
  .goal-ring {
    width: 70px;
    height: 70px;
  }
  
  .goal-ring span {
    font-size: 1rem;
  }
  
  /* Spelling */
  .spelling-slot {
    width: 2rem;
    height: 2.5rem;
    font-size: 1.2rem;
  }
  
  .spelling-letter-btn {
    width: 2rem;
    height: 2.5rem;
    font-size: 1rem;
  }
}

/* ===== TOUCH TARGET SIZES ===== */
button,
.btn-primary,
.btn-secondary,
.btn-skip,
.btn-danger,
.nav-btn,
.lang-btn,
.header-btn,
.file-label,
input[type="checkbox"],
input[type="radio"],
select {
  min-height: 44px;
  min-width: 44px;
}

/* Smaller buttons inline */
.inline-controls label,
.toggle-inline,
.spelling-actions button {
  min-height: auto;
}

/* ===== HARDWARE ACCELERATION ===== */
.flashcard,
.flashcard-simple,
.quiz-card,
.card,
.animating,
.swipe-indicator,
.badge-icon,
.streak-icon {
  transform: translateZ(0);
  will-change: transform;
  backface-visibility: hidden;
}

/* Smooth animations */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== BACKUP & VALIDATION STYLES ===== */
.backup-settings,
.backup-history {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border, #333);
}

.backup-settings h4,
.backup-history h4 {
  font-size: 0.9rem;
  color: var(--text2, #888);
  margin-bottom: 0.75rem;
}

.backup-history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem;
  background: var(--bg2, #252540);
  border-radius: 6px;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.backup-history-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.backup-history-date {
  color: var(--text1, #fff);
}

.backup-history-size {
  color: var(--text2, #888);
  font-size: 0.75rem;
}

.backup-delete-btn {
  background: none;
  border: none;
  color: var(--danger, #ff6b6b);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  font-size: 1rem;
}

.validation-results {
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--bg2, #252540);
  border-radius: 8px;
}

.validation-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border, #333);
}

.validation-item:last-child {
  border-bottom: none;
}

.validation-icon {
  font-size: 1.2rem;
}

.validation-icon.error {
  color: var(--danger, #ff6b6b);
}

.validation-icon.warning {
  color: var(--warning, #ffa500);
}

.validation-icon.success {
  color: var(--success, #4caf50);
}

.validation-text {
  flex: 1;
  font-size: 0.9rem;
}

.validation-count {
  font-weight: bold;
  color: var(--primary, #4A90E2);
}

/* ===== INPUT VALIDATION STYLES ===== */
.input-error {
  border-color: var(--danger, #ff6b6b) !important;
}

.input-warning {
  border-color: var(--warning, #ffa500) !important;
}

.input-valid {
  border-color: var(--success, #4caf50) !important;
}

.validation-message {
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

.validation-message.error {
  color: var(--danger, #ff6b6b);
}

.validation-message.warning {
  color: var(--warning, #ffa500);
}

.validation-message.success {
  color: var(--success, #4caf50);
}