/* ===== Demo button ===== */
.demo-row { text-align: center; margin-top: 12px; }
.demo-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 50px;
  font-size: 0.86rem;
  font-weight: 500;
  transition: all var(--transition);
}
.demo-btn::before { content: '✨'; font-size: 0.95rem; }
.demo-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-tint); }

/* ===== Deck library ===== */
.deck-library { margin-top: 40px; }
.deck-library-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.deck-library-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.deck-library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.deck-card {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}
.deck-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow); }
.deck-card:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.deck-card-body { min-width: 0; }
.deck-card-title {
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.deck-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.deck-card-due {
  color: var(--highlight);
  font-weight: 600;
  background: rgba(251, 191, 36, 0.12);
  padding: 1px 8px;
  border-radius: 50px;
}
.deck-card-del {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 1.2rem;
  line-height: 1;
  color: var(--text-muted);
  opacity: 0.6;
  transition: all var(--transition);
}
.deck-card-del:hover { opacity: 1; color: var(--wrong); background: rgba(239, 68, 68, 0.1); }

/* ===== Stats tab ===== */
.stats-container { max-width: 760px; margin: 0 auto; }
.stats-empty { text-align: center; color: var(--text-muted); padding: 60px 20px; font-size: 0.95rem; }

.stat-tiles {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.stat-tile {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 12px;
  text-align: center;
}
.stat-tile-value {
  display: block;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.1;
}
.stat-tile-label {
  display: block;
  margin-top: 4px;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
.stat-card-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.stat-chart { width: 100%; height: auto; overflow: visible; }
.stat-bar { fill: var(--primary); transition: fill var(--transition); }
.stat-bar.empty { fill: var(--border); }
.stat-bar-num { fill: var(--text-muted); font-size: 10px; font-family: var(--font-mono); }
.stat-axis { fill: var(--text-muted); font-size: 10px; }
.stat-grid { stroke: var(--border); stroke-width: 1; }
.stat-line { fill: none; stroke: var(--secondary); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.stat-dot { fill: var(--secondary); stroke: var(--card); stroke-width: 2; }

.exam-rows { margin-top: 16px; display: flex; flex-direction: column; }
.exam-row {
  display: grid;
  grid-template-columns: 1fr auto auto 44px;
  align-items: center;
  gap: 10px;
  padding: 9px 4px;
  font-size: 0.86rem;
  border-top: 1px solid var(--border);
}
.exam-row-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text); }
.exam-row-date { color: var(--text-muted); font-size: 0.8rem; }
.exam-row-grade { font-weight: 700; font-family: var(--font-display); color: var(--secondary); }
.exam-row-pct {
  text-align: right;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text);
}

@media (max-width: 560px) {
  .stat-tiles { grid-template-columns: repeat(2, 1fr); }
}

/* ===== Mobile bottom nav ===== */
.study-tab-icon { display: none; }

@media (max-width: 768px) {
  /* Turn the study tab strip into a fixed bottom navigation bar. */
  .study-tabs {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 120;
    padding: 0;
    border-top: 1px solid var(--border);
    border-bottom: none;
    background: var(--surface);
    justify-content: space-around;
    box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.18);
    padding-bottom: env(safe-area-inset-bottom, 0);
  }
  .study-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 4px 7px;
    border-bottom: none;
    font-size: 0.66rem;
  }
  .study-tab.active { border-bottom: none; }
  .study-tab.active .study-tab-icon { transform: translateY(-1px); }
  .study-tab-icon { display: block; width: 21px; height: 21px; }
  .study-tab-label { font-size: 0.66rem; }
  /* Keep content clear of the fixed bar. */
  .study-content { padding-bottom: 68px; }
  .chat-container { height: calc(100vh - 220px); }
}

/* ===== Today banner (cross-deck due queue) ===== */
.today-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  flex-wrap: wrap; margin-bottom: 16px; padding: 14px 18px;
  background: linear-gradient(120deg, var(--primary-tint), rgba(34, 211, 238, 0.08));
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
}
.today-banner-text { font-weight: 600; }
.today-banner-actions { display: flex; gap: 8px; align-items: center; }
.today-review-btn { padding: 8px 18px; }

/* Folder section headers inside the deck grid */
.deck-folder-head {
  grid-column: 1 / -1; font-size: 0.85rem; font-weight: 700;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em;
  margin: 10px 0 -4px; padding-top: 6px; border-top: 1px dashed var(--border);
}

/* Last-synced status next to the library title */
.sync-status { font-size: 0.78rem; font-weight: 400; color: var(--text-muted); margin-left: 10px; }

/* ===== Community gallery ===== */
.gallery-section { margin-top: 28px; }
.gallery-hint { font-size: 0.78rem; color: var(--text-muted); }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 10px;
}
.gallery-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 12px 14px;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.25s var(--ease-spring, ease), border-color 0.25s ease, box-shadow 0.25s ease;
}
.gallery-card:hover {
  transform: translateY(-3px);
  border-color: var(--secondary);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.16), 0 2px 10px var(--secondary-glow);
}
.gallery-card-title {
  font-weight: 600;
  font-size: 0.92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}
.gallery-card-meta { font-size: 0.78rem; color: var(--text-muted); display: flex; gap: 6px; align-items: center; }
.gallery-lang {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--primary-tint);
  color: var(--primary);
}
.share-publish-btn { width: 100%; margin-top: 10px; }