.nav {
  flex-shrink: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  position: relative;
}

.fadeOverlay {
  position: absolute;
  top: 0;
  right: 42px; /* 8px margin + 26px width + 8px gap */
  height: 100%;
  width: 40px;
  background: linear-gradient(to right, transparent, var(--surface));
  pointer-events: none;
  z-index: 5;
}

/* Horizontal scroll container — no visible scrollbar */
.track {
  display: flex;
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  gap: 4px;
  padding: 8px 10px;
}
.track::-webkit-scrollbar { display: none; }

.track {
  cursor: grab;
}
.track.dragging {
  cursor: grabbing;
}
.track.dragging * {
  pointer-events: none; /* Prevent text selection and hover states while dragging */
}

.collapseWrap {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin: 0 8px;
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-3);
  font-size: 11px;
  transition: background 0.15s, color 0.15s;
  user-select: none;
}
.collapseWrap:hover {
  background: var(--surface2);
  color: var(--text);
}

/* ── Tab button ────────────────────────────────────────────────────────────── */
.tab {
  position: relative;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  gap: 8px;
  padding: 9px 16px 10px;
  min-width: 210px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-2);
  font-family: var(--sans);
  text-align: left;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.tab:hover {
  background: var(--surface2);
  border-color: var(--border2);
}

.tab.active {
  background: var(--bdim, rgba(63,185,80,0.10));
  border-color: color-mix(in srgb, var(--bcolor) 45%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--bcolor) 20%, transparent) inset;
}

/* ── Top row ───────────────────────────────────────────────────────────────── */
.tabTop {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.icon {
  font-size: 18px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 1px;
}

.text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.1px;
  color: var(--text);
}
.tab.active .name { color: var(--bcolor, var(--green)); }

.tagline {
  font-size: 11px;
  color: var(--text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Count badge: stacked number + percentage */
.countWrap {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
  flex-shrink: 0;
}

.countNum {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--bcolor, var(--text-2));
  opacity: 0.9;
}

.countPct {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-3);
}
.tab.active .countPct { color: var(--bcolor, var(--text-3)); opacity: 0.7; }

/* Bundle reset button */
.bundleResetBtn {
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-3);
  padding: 2px 5px;
  border-radius: 4px;
  line-height: 1;
  margin-left: 2px;
  transition: color 0.12s, background 0.12s;
}
.bundleResetBtn:hover {
  color: var(--red);
  background: var(--red-dim);
}

/* ── Inline progress track ─────────────────────────────────────────────────── */
.progressTrack {
  width: 100%;
  height: 3px;
  background: var(--surface3);
  border-radius: 2px;
  overflow: hidden;
}

.tab.active .progressTrack {
  background: color-mix(in srgb, var(--bcolor) 25%, var(--border2));
}

.progressFill {
  height: 100%;
  background: var(--bcolor, var(--green));
  border-radius: 2px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Glow on active tab's fill */
.tab.active .progressFill {
  box-shadow: 0 0 6px color-mix(in srgb, var(--bcolor) 60%, transparent);
}

/* Locked tab during exam */
.tab.locked {
  opacity: 0.4;
  cursor: not-allowed;
  filter: grayscale(0.5);
}

/* Start Exam button */
.examBtn {
  flex-shrink: 0;
  background: var(--blue-dim);
  border: 1px solid color-mix(in srgb, var(--blue) 35%, transparent);
  color: var(--blue);
  border-radius: 5px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 700;
  font-family: var(--sans);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s, transform 0.1s;
  white-space: nowrap;
}
.tab:hover .examBtn { opacity: 1; }
.examBtn:hover { background: var(--blue); color: #fff; transform: scale(1.05); }

/* In-exam badge */
.examBadge {
  flex-shrink: 0;
  background: rgba(252,196,25,0.15);
  border: 1px solid rgba(252,196,25,0.35);
  color: var(--amber);
  border-radius: 5px;
  padding: 3px 8px;
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
}