/* ============================================================
   sidebar.css — Sidebar layout, XP bar, nav, language switcher
   Uses CSS logical properties throughout for RTL support.
   ============================================================ */

/* ---- Sidebar shell ---- */
.sidebar {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--space-4) 0;
}

/* ---- Brand / Logo ---- */
.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-5);
  margin-block-end: var(--space-6);
  text-decoration: none;
  position: relative;
}

.sidebar__brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(140deg, var(--accent-green-light), var(--accent-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.sidebar__brand-name {
  font-size: var(--text-sm);
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  line-height: 1.2;
}

/* ---- Learner profile panel ---- */
.sidebar__profile {
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(150deg, rgba(90,227,255,0.12), rgba(23,52,65,0.5));
  margin-inline: var(--space-3);
  border: 1px solid rgba(90,227,255,0.26);
  border-radius: 14px;
  margin-block-end: var(--space-5);
}

.sidebar__name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-block-end: var(--space-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar__level-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-block-end: var(--space-2);
}

.sidebar__level-name {
  font-size: var(--text-xs);
  color: var(--accent-green);
  font-weight: var(--font-medium);
}

.sidebar__xp-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.sidebar__xp-bar {
  width: 100%;
  height: 5px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-block-end: var(--space-2);
}

.sidebar__xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  min-width: 4px;
}

.sidebar__meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.sidebar__streak {
  font-size: var(--text-xs);
  color: var(--accent-yellow);
}

.sidebar__completion {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ---- Navigation ---- */
.sidebar__nav {
  flex: 1;
  overflow-y: auto;
  padding: 0 var(--space-2);
}

.sidebar__section-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-blue);
  padding: var(--space-3) var(--space-3) var(--space-1);
  font-weight: 700;
}

.sidebar__nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: 12px;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
  margin-block-end: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border: 1px solid transparent;
}

.sidebar__nav-item:hover {
  background: rgba(90,227,255,0.12);
  color: var(--text-primary);
  border-color: rgba(90,227,255,0.32);
  transform: translateX(2px);
}

.sidebar__nav-item.is-active {
  background: linear-gradient(110deg, rgba(200,255,34,0.18), rgba(90,227,255,0.08));
  border-color: rgba(200,255,34,0.38);
  color: var(--accent-green);
  font-weight: 700;
}

.sidebar__nav-item-icon {
  width: 18px;
  text-align: center;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar__nav-item.is-active .sidebar__nav-item-icon {
  opacity: 1;
}

/* Module lesson sub-list */
.sidebar__sub-nav {
  padding-inline-start: var(--space-8);
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--transition-slow);
}

.sidebar__sub-nav.is-open {
  max-height: 400px;
}

.sidebar__sub-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: 10px;
  color: var(--text-muted);
  font-size: var(--text-xs);
  text-decoration: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.sidebar__sub-item:hover { color: var(--text-primary); }
.sidebar__sub-item:hover {
  background: rgba(90,227,255,0.08);
}
.sidebar__sub-item.is-active {
  color: var(--accent-green);
  background: rgba(200,255,34,0.08);
}

.sidebar__sub-item-check {
  color: var(--accent-green);
  font-size: 10px;
}

/* ---- Language Switcher ---- */
.sidebar__lang {
  padding: var(--space-4) var(--space-5);
  border-block-start: 1px solid rgba(90,227,255,0.22);
  margin-block-start: var(--space-2);
}

.sidebar__lang-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-block-end: var(--space-2);
  display: block;
}

.sidebar__lang-buttons {
  display: flex;
  gap: var(--space-1);
}

.sidebar__lang-btn {
  flex: 1;
  padding: var(--space-1) var(--space-2);
  border: 1px solid rgba(90,227,255,0.25);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.sidebar__lang-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  box-shadow: var(--glow-blue);
}

.sidebar__lang-btn.is-active {
  background: rgba(200, 255, 34, 0.2);
  border-color: rgba(200,255,34,0.62);
  color: var(--accent-green);
  font-weight: 700;
}

/* ---- Hamburger (mobile) ---- */
.sidebar-toggle {
  display: none;
  position: fixed;
  inset-block-start: var(--space-4);
  inset-inline-start: var(--space-4);
  z-index: 200;
  background: linear-gradient(130deg, rgba(90,227,255,0.16), rgba(200,255,34,0.14));
  border: 1px solid rgba(90,227,255,0.42);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--text-primary);
  font-size: var(--text-lg);
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 99;
}

@media (max-width: 768px) {
  .sidebar-toggle {
    display: flex;
    inset-block-start: max(var(--space-3), env(safe-area-inset-top, 0px));
    inset-inline-start: var(--space-3);
  }
  .sidebar-overlay.is-visible { display: block; }
}