/* ═══════════════════════════════════════════════════════
   TEACHER PORTAL — sidebar.css
   Sidebar layout, logo, teacher card, navigation,
   collapse, icon-only mode.
   ═══════════════════════════════════════════════════════ */

/* ── SIDEBAR ── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: width 0.28s cubic-bezier(0.4,0,0.2,1),
              transform 0.3s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto;
  overflow-x: hidden;
}

/* ── Logo ── */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 28px 24px 20px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.sidebar-logo-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}

.sidebar-logo-text {
  font-family: 'Sora', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.2px;
  transition: opacity 0.2s, width 0.2s;
}

.sidebar-logo-text em {
  font-style: normal;
  color: var(--accent-light);
}

/* ── Teacher Card ── */
.sidebar-teacher-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.sidebar-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #fff;
  font-family: 'Sora', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sidebar-teacher-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-teacher-badge {
  font-size: 0.7rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-top: 1px;
}

.sidebar-teacher-info {
  transition: opacity 0.2s, width 0.2s;
}

/* ── Navigation ── */
.sidebar-nav {
  flex: 1;
  padding: 14px 14px 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--sidebar-text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.18s, color 0.18s;
  white-space: nowrap;
  user-select: none;
}

.nav-item:hover {
  background: rgba(255,255,255,0.07);
  color: #e2e8f0;
}

.nav-item.active {
  background: rgba(99,102,241,0.18);
  color: var(--sidebar-active);
}

.nav-item.active .nav-icon { color: var(--accent-light); }

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-item.active .nav-icon { opacity: 1; }

.nav-label {
  transition: opacity 0.2s, width 0.2s;
}

/* ── Sidebar Logout ── */
.sidebar-logout {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 14px 26px;
  background: none;
  border: none;
  border-top: 1px solid var(--sidebar-border);
  color: #64748b;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: color 0.18s;
  flex-shrink: 0;
}

.sidebar-logout:hover { color: var(--red); }

/* ── SIDEBAR INNER COLLAPSE BUTTON ── */
.sidebar-inner-collapse {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 13px 26px;
  background: none;
  border: none;
  border-top: 1px solid var(--sidebar-border);
  color: #64748b;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: color 0.18s, background 0.18s;
  flex-shrink: 0;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-inner-collapse:hover {
  color: #e2e8f0;
  background: rgba(255,255,255,0.06);
}

.sidebar-inner-collapse .nav-label {
  transition: opacity 0.2s, width 0.2s;
}

/* Rotate arrow when collapsed */
.collapse-arrow-icon {
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
  flex-shrink: 0;
}

/* ── ICON-ONLY SIDEBAR (narrow collapsed) ── */
:root {
  --sidebar-w-collapsed: 68px;
}

.sidebar-icon-only {
  width: var(--sidebar-w-collapsed);
}

/* When icon-only: push main content */
.sidebar-icon-only ~ .main-wrap,
.app-shell:has(.sidebar-icon-only) .main-wrap {
  margin-left: var(--sidebar-w-collapsed);
}

/* Hide text labels inside icon-only sidebar */
.sidebar-icon-only .sidebar-logo-text,
.sidebar-icon-only .sidebar-teacher-info,
.sidebar-icon-only .nav-label,
.sidebar-icon-only .sidebar-logout .nav-label,
.sidebar-icon-only .sidebar-inner-collapse .nav-label {
  opacity: 0;
  width: 0;
  overflow: hidden;
  pointer-events: none;
}

/* Adjust paddings for icon-only mode */
.sidebar-icon-only .sidebar-logo {
  padding: 28px 0 20px;
  justify-content: center;
  gap: 0;
}

.sidebar-icon-only .sidebar-teacher-card {
  padding: 14px 0;
  justify-content: center;
}

.sidebar-icon-only .nav-item {
  padding: 11px 0;
  justify-content: center;
  gap: 0;
}

.sidebar-icon-only .sidebar-logout {
  padding: 14px 0;
  justify-content: center;
}

.sidebar-icon-only .sidebar-inner-collapse {
  padding: 13px 0;
  justify-content: center;
}

/* Flip arrow to point right when collapsed */
.sidebar-icon-only .collapse-arrow-icon {
  transform: rotate(180deg);
}

/* Tooltip on hover in icon-only mode */
.sidebar-icon-only .nav-item {
  position: relative;
}

.sidebar-icon-only .nav-item::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: #1e293b;
  color: #f1f5f9;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s;
  z-index: 300;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}

.sidebar-icon-only .nav-item::before {
  content: '';
  position: absolute;
  left: calc(100% + 6px);
  top: 50%;
  transform: translateY(-50%);
  border: 5px solid transparent;
  border-right-color: #1e293b;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s;
  z-index: 300;
}

.sidebar-icon-only .nav-item:hover::after,
.sidebar-icon-only .nav-item:hover::before {
  opacity: 1;
}