/* ---------- Tokens ---------- */
:root {
  --bg: #faf3e6;
  --surface: #fffdf8;
  --surface-alt: #f2e8d5;
  --ink: #33291f;
  --ink-soft: #7a6b57;
  --border: #e6d9c2;
  --sage: #6f8f6a;
  --sage-deep: #56714f;
  --sage-tint: #e4ecdf;
  --clay: #c9a876;
  --coral: #c97361;
  --coral-tint: #f4e2dd;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --shadow-card: 0 10px 34px rgba(51, 41, 31, 0.10);
  --shadow-soft: 0 2px 10px rgba(51, 41, 31, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
}

h1, h2 {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  margin: 0;
  color: var(--ink);
}

label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 1.25rem 0 0.4rem;
}

input[type="text"],
input[type="password"],
textarea,
select {
  width: 100%;
  font-family: 'Nunito', sans-serif;
  font-size: 1rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  outline: none;
  transition: border-color 0.15s ease;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--sage);
}

textarea { resize: vertical; line-height: 1.5; }

button {
  font-family: 'Nunito', sans-serif;
  cursor: pointer;
}

/* ---------- Header ---------- */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 640px;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 0.5rem;
}

.logo {
  font-size: 1.4rem;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--ink-soft);
  padding: 0.4rem;
  border-radius: 50%;
  display: flex;
  transition: background 0.15s ease, color 0.15s ease;
}

.icon-btn:hover { background: var(--surface-alt); color: var(--ink); }

/* ---------- Buttons ---------- */
.btn {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.7rem 1.3rem;
  font-weight: 800;
  font-size: 0.95rem;
  transition: transform 0.12s ease, background 0.15s ease, box-shadow 0.15s ease;
}

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

.btn-primary { background: var(--sage); color: #fff; }
.btn-primary:hover { background: var(--sage-deep); }

.btn-secondary { background: transparent; color: var(--ink); border-color: var(--border); }
.btn-secondary:hover { background: var(--surface-alt); }

.btn-danger { background: var(--coral); color: #fff; }
.btn-danger:hover { background: #b05e4e; }

.btn-small { padding: 0.45rem 0.9rem; font-size: 0.85rem; }

/* ---------- Views ---------- */
.view {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.25rem;
}

.back-link {
  background: none;
  border: none;
  color: var(--ink-soft);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0;
  margin-bottom: 0.75rem;
}

.back-link:hover { color: var(--ink); }

/* ---------- Library ---------- */
.library-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.deck-list { display: flex; flex-direction: column; gap: 0.75rem; }

.deck-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
}

.deck-card h3 {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 1.1rem;
  margin: 0 0 0.2rem;
}

.deck-meta {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.deck-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.empty-state {
  text-align: center;
  color: var(--ink-soft);
  padding: 3rem 1rem;
}

.empty-state p:first-child { font-weight: 800; color: var(--ink); }
.empty-sub { font-size: 0.9rem; }

/* ---------- Generator ---------- */
.generator-status {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
}

.generator-status.loading { background: var(--surface-alt); color: var(--ink-soft); }
.generator-status.success { background: var(--sage-tint); color: var(--sage-deep); }
.generator-status.error { background: var(--coral-tint); color: var(--coral); }

#generateBtn { margin-top: 1.5rem; width: 100%; }

/* ---------- Study mode shell ---------- */
.study-view {
  max-width: 720px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.25rem 2rem;
}

.study-topbar {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.exit-btn {
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--ink-soft);
  padding: 0.2rem 0.4rem;
}

.exit-btn:hover { color: var(--ink); }

.progress-track {
  flex: 1;
  height: 6px;
  background: var(--surface-alt);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--sage);
  border-radius: 4px;
  transition: width 0.35s ease;
}

.progress-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-soft);
  min-width: 3.5rem;
  text-align: right;
}

/* ---------- Flashcard ---------- */
.card-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
}

.flashcard {
  width: min(100%, 600px);
  height: min(52vh, 380px);
  perspective: 1600px;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s cubic-bezier(0.4, 0.15, 0.2, 1);
  transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1.35;
}

.flashcard-back {
  transform: rotateY(180deg);
  background: var(--sage-tint);
  color: var(--sage-deep);
}

.tap-hint {
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin: 0;
}

.flashcard-controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  padding-top: 1rem;
}

.control-btn {
  flex: 1;
  max-width: 200px;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.9rem 0.5rem;
  font-weight: 800;
  font-size: 0.95rem;
  transition: transform 0.12s ease, filter 0.15s ease;
}

.control-btn:active { transform: scale(0.96); }
.control-btn:hover { filter: brightness(0.96); }

.control-btn.wrong { background: var(--coral-tint); color: var(--coral); }
.control-btn.skip { background: var(--surface-alt); color: var(--ink-soft); }
.control-btn.right { background: var(--sage-tint); color: var(--sage-deep); }

/* ---------- Quiz ---------- */
.quiz-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.75rem;
  padding: 1rem 0;
}

.quiz-question {
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  font-weight: 500;
  line-height: 1.35;
  text-align: center;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quiz-option {
  text-align: left;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.12s ease, background 0.15s ease;
}

.quiz-option:hover:not(:disabled) { border-color: var(--sage); }
.quiz-option:active:not(:disabled) { transform: scale(0.99); }

.quiz-option.correct { background: var(--sage-tint); border-color: var(--sage); color: var(--sage-deep); }
.quiz-option.incorrect { background: var(--coral-tint); border-color: var(--coral); color: var(--coral); animation: shake 0.4s ease; }

@keyframes shake {
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}

.next-btn { align-self: center; margin-top: 1.5rem; min-width: 160px; }

/* ---------- Results ---------- */
.results-box {
  margin: auto;
  text-align: center;
  max-width: 420px;
  animation: rise 0.35s ease;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-stats {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 1.5rem 0 2rem;
}

.stat {
  padding: 0.9rem 1.3rem;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 0.95rem;
  background: var(--surface-alt);
  color: var(--ink-soft);
}

.stat.right { background: var(--sage-tint); color: var(--sage-deep); }
.stat.wrong { background: var(--coral-tint); color: var(--coral); }

.results-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* ---------- Modals ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(51, 41, 31, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  z-index: 10;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-card);
  animation: pop 0.2s ease;
}

@keyframes pop {
  from { opacity: 0; transform: scale(0.97); }
  to { opacity: 1; transform: scale(1); }
}

.hint {
  color: var(--ink-soft);
  font-size: 0.8rem;
  margin: 0.4rem 0 0;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-top: 1.75rem;
}

/* ---------- Utility ---------- */
[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .flashcard-inner, .progress-fill, .results-box, .quiz-option, .btn, .control-btn {
    animation: none !important;
    transition: none !important;
  }
}

@media (max-width: 480px) {
  .flashcard-controls { flex-direction: column; }
  .control-btn { max-width: none; }
}

/* ---------- Generator: reasoning + difficulty + counts ---------- */
.reasoning-box {
  background: var(--sage-tint);
  color: var(--sage-deep);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0.5rem 0 1.25rem;
}

.difficulty-pills {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.pill-btn {
  flex: 1;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 0.5rem;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--ink-soft);
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.pill-btn:hover { border-color: var(--sage); }

.pill-btn.pill-active {
  background: var(--sage);
  border-color: var(--sage);
  color: #fff;
}

.count-row {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
}

.count-input-group { flex: 1; }
.count-input-group label { margin-top: 0; }

#generateBtn { margin-top: 1.5rem; width: 100%; }

/* ---------- Deck editing ---------- */
.edit-modal {
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
}

.edit-modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.edit-modal-head .exit-btn { font-size: 1.4rem; }

.edit-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 1.5rem 0 0.75rem;
}

.edit-section-head h3 {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 1rem;
  margin: 0;
}

.edit-item-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.edit-item {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem;
}

.edit-item-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.6rem;
}

.edit-item-fields { flex: 1; display: flex; flex-direction: column; gap: 0.5rem; }

.edit-item textarea,
.edit-item input[type="text"] {
  background: var(--surface);
}

.edit-remove-btn {
  background: none;
  border: none;
  color: var(--ink-soft);
  font-size: 1.3rem;
  line-height: 1;
  padding: 0.1rem 0.3rem;
  border-radius: 6px;
  flex-shrink: 0;
}

.edit-remove-btn:hover { color: var(--coral); background: var(--coral-tint); }

.edit-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.edit-option-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.edit-option-row input[type="radio"] { accent-color: var(--sage); flex-shrink: 0; }
.edit-option-row input[type="text"] { flex: 1; padding: 0.45rem 0.7rem; font-size: 0.9rem; }

.edit-modal-actions { margin-top: 1.75rem; }