/* ═══════════════════════════════════════════════════════
   TEACHER PORTAL — topnav.css
   Main wrap, top navigation bar, collapse button,
   breadcrumb, icon buttons, teacher info, logout.
   ═══════════════════════════════════════════════════════ */

/* ── MAIN WRAP ── */
.main-wrap {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: margin-left 0.28s cubic-bezier(0.4,0,0.2,1);
}

/* ── TOP NAV ── */
.topnav {
  height: var(--topnav-h);
  background: var(--topnav-bg);
  border-bottom: 1px solid var(--topnav-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.topnav-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ── Sidebar collapse button in topnav ── */
.sidebar-collapse-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px 7px 10px;
  background: var(--accent-soft);
  border: 1.5px solid rgba(99,102,241,0.18);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--accent);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.18s, color 0.18s, border-color 0.18s, box-shadow 0.18s;
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.sidebar-collapse-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 3px 10px rgba(79,70,229,0.25);
}

/* Icons — show open icon by default, close icon when collapsed */
.collapse-icon-open  { display: block; flex-shrink: 0; }
.collapse-icon-close { display: none;  flex-shrink: 0; }

.sidebar-collapsed .collapse-icon-open  { display: none; }
.sidebar-collapsed .collapse-icon-close { display: block; }

.collapse-btn-label { line-height: 1; }

.topnav-divider {
  width: 1px;
  height: 22px;
  background: var(--border);
  margin: 0 4px;
}

.topnav-breadcrumb {
  font-family: 'Sora', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

/* ── Right side ── */
.topnav-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topnav-icon-btn {
  position: relative;
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-sub);
  transition: background 0.15s, color 0.15s;
}

.topnav-icon-btn:hover { background: #f1f5f9; color: var(--text-main); }

.notif-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--red);
  color: #fff;
  font-size: 0.6rem;
  font-weight: 700;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--topnav-bg);
}

/* ── Teacher info ── */
.topnav-teacher {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topnav-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #fff;
  font-family: 'Sora', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.topnav-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.topnav-logout-btn {
  padding: 8px 16px;
  background: var(--accent-soft);
  color: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.825rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, color 0.18s;
}

.topnav-logout-btn:hover { background: var(--accent); color: #fff; }