/* ── ممانتین Study CSS ── */

:root {
  --clr-bg:       #f8fafc;
  --clr-surface:  #ffffff;
  --clr-border:   #e2e8f0;
  --clr-text:     #1e293b;
  --clr-muted:    #64748b;
  --clr-primary:  #6366f1;
  --clr-primary-h:#4f46e5;
  --radius:       16px;
  --shadow:       0 4px 24px rgba(0,0,0,.08);
}

/* ── داشبورد ────────────────────────────────────────── */
.memantin-dashboard { font-family: Vazirmatn, Tahoma, sans-serif; color: var(--clr-text); }

.memantin-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.summary-card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  text-align: center;
  border-top: 4px solid var(--clr-border);
}
.summary-card.due      { border-color: #ef4444; }
.summary-card.reviewed { border-color: #22c55e; }
.summary-card.mastered { border-color: #6366f1; }
.summary-card.streak   { border-color: #f97316; }

.summary-card .num  { display: block; font-size: 2.2rem; font-weight: 800; }
.summary-card .lbl  { font-size: .85rem; color: var(--clr-muted); }

/* ── گرید بسته‌ها ───────────────────────────────────── */
.memantin-decks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.deck-card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid var(--clr-border);
  transition: transform .15s, box-shadow .15s;
}
.deck-card:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(0,0,0,.12); }

.deck-card h3   { margin: 0; font-size: 1.1rem; }
.deck-meta, .deck-level { font-size: .8rem; color: var(--clr-muted); }
.deck-badge {
  display: inline-block;
  background: #ede9fe;
  color: #6d28d9;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 700;
  width: fit-content;
}

.progress-bar {
  background: #e2e8f0;
  border-radius: 99px;
  height: 8px;
  overflow: hidden;
}
.progress-fill {
  background: linear-gradient(90deg, #6366f1, #8b5cf6);
  height: 100%;
  border-radius: 99px;
  transition: width .4s;
}
.progress-label { font-size: .8rem; color: var(--clr-muted); }

.deck-counts { display: flex; gap: 8px; font-size: .78rem; flex-wrap: wrap; }
.c-new    { color: #6366f1; }
.c-learn  { color: #f97316; }
.c-review { color: #22c55e; }

.btn-study {
  display: block;
  background: var(--clr-primary);
  color: #fff;
  text-align: center;
  padding: 10px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  margin-top: auto;
  transition: background .15s;
}
.btn-study:hover { background: var(--clr-primary-h); color: #fff; }
.all-done { color: #22c55e; font-weight: 600; font-size: .9rem; }

/* ── رابط مطالعه ─────────────────────────────────────── */
.memantin-study-app {
  font-family: Vazirmatn, Tahoma, sans-serif;
  max-width: 680px;
  margin: 0 auto;
  padding: 24px 16px;
}

.study-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.study-header h2  { flex: 1; margin: 0; font-size: 1.2rem; }
.back-link        { color: var(--clr-muted); text-decoration: none; font-size: .9rem; }
.progress-text    { color: var(--clr-muted); font-size: .9rem; white-space: nowrap; }

.study-loading {
  text-align: center;
  padding: 60px;
  color: var(--clr-muted);
  font-size: 1.1rem;
}

/* ── کارت فلش ───────────────────────────────────────── */
.flashcard {
  perspective: 1200px;
  cursor: pointer;
  margin-bottom: 20px;
  user-select: none;
  min-height: 220px;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  min-height: 220px;
  transition: transform 0.45s cubic-bezier(.4,0,.2,1);
  transform-style: preserve-3d;
  /* ارتفاع را بر اساس محتوای بلندتر تنظیم کن */
  height: 100%;
}

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

.flashcard-front,
.flashcard-back {
  position: absolute;
  top: 0; left: 0; right: 0;
  min-height: 220px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--clr-border);
  box-sizing: border-box;
  word-break: break-word;
  overflow-wrap: break-word;
}

.flashcard-back {
  transform: rotateY(180deg);
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.card-content {
  font-size: 1.2rem;
  line-height: 1.8;
  text-align: center;
  direction: rtl;
}

.card-image {
  max-width: 100%;
  max-height: 200px;
  border-radius: 8px;
  margin-top: 12px;
  object-fit: contain;
}

.hint-area {
  margin-top: 16px;
  text-align: center;
}

#btn-show-hint {
  background: none;
  border: 1px solid var(--clr-border);
  color: var(--clr-muted);
  padding: 4px 14px;
  border-radius: 20px;
  cursor: pointer;
  font-size: .85rem;
}

#card-hint {
  color: var(--clr-muted);
  font-size: .9rem;
  background: #fef9c3;
  padding: 8px 14px;
  border-radius: 8px;
  margin: 8px 0 0;
}

/* ── دکمه‌های عمل ────────────────────────────────────── */
.action-area { text-align: center; }

.btn-primary-action {
  display: inline-block;
  background: var(--clr-primary);
  color: #fff;
  padding: 14px 40px;
  border-radius: 12px;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, transform .1s;
}
.btn-primary-action:hover { background: var(--clr-primary-h); transform: scale(1.02); }

/* ── دکمه‌های رتبه‌بندی ──────────────────────────────── */
.rating-prompt {
  color: var(--clr-muted);
  font-size: .95rem;
  margin-bottom: 14px;
}

.rating-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.rating-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 20px;
  border-radius: 12px;
  border: 2px solid var(--clr);
  background: color-mix(in srgb, var(--clr) 10%, transparent);
  color: var(--clr);
  cursor: pointer;
  min-width: 90px;
  transition: background .15s, transform .1s;
  font-family: inherit;
}
.rating-btn:hover {
  background: var(--clr);
  color: #fff;
  transform: scale(1.04);
}
.rating-btn:disabled { opacity: .5; cursor: not-allowed; }

.r-label { font-size: 1rem; font-weight: 700; }
.r-next  { font-size: .75rem; margin-top: 4px; opacity: .8; }

/* ── پایان جلسه ──────────────────────────────────────── */
.study-complete {
  text-align: center;
  padding: 60px 20px;
}
.complete-icon { font-size: 4rem; margin-bottom: 16px; }
.study-complete h2 { font-size: 1.8rem; margin-bottom: 12px; }
.study-complete p  { color: var(--clr-muted); margin-bottom: 24px; }

/* ── فروشگاه ─────────────────────────────────────────── */
.owned-badge {
  color: #22c55e;
  font-weight: 700;
  font-size: .9rem;
}
.btn-buy {
  display: block;
  background: var(--clr-primary);
  color: #fff;
  text-align: center;
  padding: 10px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  margin-top: auto;
  transition: background .15s;
}
.btn-buy:hover    { background: var(--clr-primary-h); }
.btn-buy.btn-free { background: #22c55e; }

/* ── ریسپانسیو ───────────────────────────────────────── */
@media (max-width: 600px) {
  .memantin-summary { grid-template-columns: repeat(2, 1fr); }
  .rating-buttons  { gap: 8px; }
  .rating-btn      { min-width: 72px; padding: 10px 12px; }
  .card-content    { font-size: 1.05rem; }
}