/* ═══════════════════════════════════════
   SIDEBAR LAYOUTS
   ════════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  transition: width var(--transition-fast);
}
.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}
.sidebar-logo {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-logo-mark {
  background-color: var(--color-teal);
  color: white;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 6px;
}
.sidebar-logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-teal);
}
.sidebar.collapsed .sidebar-logo-text {
  display: none;
}
.sidebar-nav {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}
.sidebar-section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 12px 8px 4px 8px;
}
.sidebar.collapsed .sidebar-section-label {
  display: none;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-weight: 500;
  transition: all var(--transition-fast);
}
.nav-item:hover, .nav-item.active {
  background-color: var(--color-blue-light);
  color: var(--color-blue);
}
.sidebar.collapsed .nav-label {
  display: none;
}

/* TOP BAR STRUCTURAL ELEMENTS */
.topbar {
  height: 70px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  position: sticky;
  top: 0;
  z-index: 90;
}
.topbar-title {
  font-size: 20px;
  font-weight: 600;
}
.search-bar {
  display: flex;
  align-items: center;
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 6px 16px;
  gap: 8px;
  width: 320px;
}
.search-bar input {
  border: none;
  background: transparent;
  outline: none;
  width: 100%;
  color: var(--text-main);
}
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-teal-light);
  color: var(--color-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

/* INTERACTIVE BUTTON DESIGNS */
.btn {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background-color var(--transition-fast), transform 0.1s ease;
}
.btn:active {
  transform: scale(0.98);
}
.btn-primary { background-color: var(--color-teal); color: white; }
.btn-primary:hover { background-color: #0b766d; }
.btn-ghost { background-color: transparent; border: 1px solid var(--border-color); color: var(--text-main); }
.btn-ghost:hover { background-color: var(--bg-surface-hover); border-color: var(--text-muted); }

/* MODAL / POPUP INTERFACE CODES */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal {
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 650px;
  padding: 28px;
  box-shadow: var(--shadow-lg);
  max-height: 90vh;
  overflow-y: auto;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.modal-title { font-size: 22px; font-weight: 600; color: var(--color-teal); }
.modal-close { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--text-muted); }
.modal-close:hover { color: var(--color-crimson); }
.modal-section { margin-bottom: 16px; }
.modal-section-label { font-size: 12px; font-weight: 600; text-transform: uppercase; color: var(--text-muted); margin-bottom: 4px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }

/* BOOKMARK BUTTON INDIVIDUAL STYLING */
.save-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: #cbd5e1;
  transition: transform var(--transition-fast), color var(--transition-fast);
  z-index: 10;
  line-height: 1;
}
.save-btn:hover {
  transform: scale(1.2);
  color: var(--color-butter);
}
.save-btn.saved {
  color: var(--color-butter);
}