:root {
  --bg: #0f172a;
  --panel: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #22c55e;
  --accent-2: #3b82f6;
  --bad: #ef4444;
  --good: #22c55e;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(180deg, #0b1022, #0f172a 40%);
  color: var(--text);
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem clamp(1rem, 3vw, 2rem);
  background: #0b1223aa;
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #1f2937;
}
.topbar h1 { font-size: clamp(1.1rem, 2.4vw, 1.6rem); margin: 0; }
.scorebox { font-weight: 600; color: var(--accent); }

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: clamp(0.5rem, 2vw, 1rem);
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 1.5rem;
  align-items: start;
}

.left-content {
  min-width: 0; /* Prevent grid blowout */
}

/* Wrong answers sidebar */
.wrong-sidebar {
  background: var(--panel);
  border: 1px solid #1f2937;
  border-radius: 12px;
  padding: 1rem;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}

.wrong-sidebar h3 {
  margin: 0 0 1rem 0;
  font-size: 1.1rem;
  color: var(--text);
}

.wrong-items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.wrong-item {
  background: #0b1223;
  border: 1px solid #7f1d1d;
  border-radius: 8px;
  padding: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.wrong-item .icon {
  font-size: 1.5rem;
}

.wrong-item .text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.wrong-item .uk-text {
  font-weight: 600;
}

.wrong-item .no-text {
  color: var(--muted);
  font-size: 0.85rem;
}

.wrong-item .remove-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  font-size: 1rem;
  transition: color 0.2s;
}

.wrong-item .remove-btn:hover {
  color: var(--text);
}

.empty-state {
  color: var(--muted);
  text-align: center;
  padding: 2rem 1rem;
  font-style: italic;
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  
  .wrong-sidebar {
    order: -1; /* Show above on mobile */
    position: static;
    max-height: 200px;
  }
}

.controls {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: .5rem;
  align-items: center;
  background: var(--panel);
  border: 1px solid #1f2937;
  border-radius: 12px;
  padding: .75rem;
}
label { color: var(--muted); }
select, button {
  font: inherit;
  padding: .6rem .8rem;
  border-radius: 10px;
  border: 1px solid #293446;
  background: #0b1223;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
}
button:hover {
  background: #1e293b;
  border-color: #3b4a5e;
  transform: translateY(-1px);
}
button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}
button:disabled:hover {
  background: #0b1223;
  border-color: #293446;
  transform: none;
}
button.primary { background: var(--accent-2); border-color: #1f4eb5; }
button.primary:hover { 
  background: #4f96ff; 
  border-color: #3b82f6;
}
button.ghost { background: transparent; }
button.ghost:hover {
  background: #1e293b;
  border-color: #475569;
}
button.good { background: var(--good); color: #052e16; border-color: #065f46; }
button.good:hover {
  background: #16a34a;
  border-color: #15803d;
  transform: translateY(-1px);
}
button.bad { background: var(--bad); color: #3f0a0a; border-color: #7f1d1d; }
button.bad:hover {
  background: #f87171;
  border-color: #dc2626;
  transform: translateY(-1px);
}
button.icon-btn { 
  background: #1e293b; 
  border: 1px solid #334155; 
  padding: .6rem 1rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}
button.icon-btn:hover {
  background: #334155;
  border-color: #475569;
  transform: scale(1.05);
}
button:focus { outline: 2px solid var(--accent-2); outline-offset: 2px; }

.card-area {
  margin: 1rem auto;
  display: grid;
  place-items: center;
  perspective: 1500px;
}

.card {
  width: min(92vw, 520px);
  height: min(65vh, 380px);
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.card.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  background: radial-gradient(1200px 600px at 20% -20%, #1b2538, #0f172a);
  border: 1px solid #1f2937;
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(0,0,0,.35);
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 1rem;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform-style: preserve-3d;
}

.card-front .icon {
  font-size: clamp(3rem, 12vw, 5rem);
  justify-self: center;
}
.card-front .word {
  align-self: center;
  justify-self: center;
  font-size: clamp(1.6rem, 6vw, 2.2rem);
  letter-spacing: 1px;
}
.card-front .hint { color: var(--muted); justify-self: center; }

.card-back { transform: rotateY(180deg); }
.card-back .icon {
  font-size: clamp(3rem, 12vw, 5rem);
  justify-self: center;
}
.card-back .translation {
  align-self: center; justify-self: center;
  font-size: clamp(1.4rem, 5.5vw, 2rem);
}
.card-back .feedback { 
  display: flex; 
  gap: .75rem; 
  justify-content: center; 
  align-items: center; 
}
.card-back .feedback .speak-btn {
  padding: .6rem .8rem;
  font-size: 1.2rem;
}

/* Remove old flip animation state - now handled by .card.flipped */

.progress { margin-top: 1rem; }
.progress .bar { height: 10px; background: #0b1223; border: 1px solid #1f2937; border-radius: 999px; overflow: hidden; }
.bar-inner { height: 100%; background: linear-gradient(90deg, var(--accent), #a3e635); width: 0%; }

footer { 
  text-align: center; 
  padding: 2rem 1rem; 
  background: transparent;
  border-top: 1px solid #1f2937;
  margin-top: 2rem;
}

footer a {
  display: inline-block;
  text-decoration: none;
  transition: transform 0.3s;
}

footer a:hover {
  transform: translateY(-3px);
}

.footer-logo {
  max-width: 115px;
  width: 100%;
  height: auto;
  opacity: 0.85;
  transition: opacity 0.3s, transform 0.3s, box-shadow 0.3s;
  display: block;
  margin: 0 auto;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.footer-logo:hover {
  opacity: 1;
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
  cursor: pointer;
}

/* Modal styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  overflow-y: auto;
}
.modal.active { display: flex; align-items: center; justify-content: center; }
.modal-content {
  background: var(--panel);
  border: 1px solid #1f2937;
  border-radius: 16px;
  max-width: 700px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid #1f2937;
}
.modal-header h2 { margin: 0; }
.close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--muted);
  padding: 0.5rem;
}
.close-btn:hover { color: var(--text); }
.modal-body { padding: 1.5rem; }

/* Admin tabs */
.admin-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.tab-btn {
  background: #0b1223;
  border: 1px solid #293446;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  color: var(--muted);
}
.tab-btn.active {
  background: var(--accent-2);
  color: white;
  border-color: #1f4eb5;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Form styling */
form { display: flex; flex-direction: column; gap: 1rem; }
form label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  color: var(--text);
}
form input, form select {
  font: inherit;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid #293446;
  background: #0b1223;
  color: var(--text);
}
form button { align-self: flex-start; }

/* Words list */
.word-item {
  background: #0b1223;
  border: 1px solid #293446;
  border-radius: 8px;
  padding: 0.8rem;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.word-info { display: flex; gap: 1rem; align-items: center; }
.word-actions { display: flex; gap: 0.5rem; }
.btn-small {
  padding: 0.4rem 0.8rem;
  font-size: 0.9rem;
}

hr {
  border: none;
  border-top: 1px solid #1f2937;
  margin: 1.5rem 0;
}

#addWordStatus, #importStatus, #addCategoryStatus {
  margin-top: 1rem;
  padding: 0.8rem;
  border-radius: 8px;
  display: none;
}
.status-success {
  background: #052e16;
  border: 1px solid #065f46;
  color: var(--good);
  display: block;
}
.status-error {
  background: #3f0a0a;
  border: 1px solid #7f1d1d;
  color: var(--bad);
  display: block;
}

/* mobile tweaks */
@media (max-width: 640px) {
  .controls { grid-template-columns: 1fr 1fr 1fr; }
  #startBtn { grid-column: 2 / span 1; }
}