/* ─── Material Design 3 — Dark Theme ───────────────────────────── */
:root {
  --md-primary:            #D0BCFF;
  --md-on-primary:         #381E72;
  --md-primary-container:  #4F378B;
  --md-on-primary-container: #EADDFF;
  --md-secondary-container: #4A4458;
  --md-on-secondary-container: #E8DEF8;
  --md-error:              #FFB4AB;
  --md-error-container:    #93000A;
  --md-on-error-container: #FFDAD6;
  --md-surface:            #141218;
  --md-surface-low:        #1D1B20;
  --md-surface-mid:        #211F26;
  --md-surface-high:       #2B2930;
  --md-surface-highest:    #36343B;
  --md-on-surface:         #E6E1E5;
  --md-on-surface-var:     #CAC4D0;
  --md-outline:            #938F99;
  --md-outline-var:        #49454F;

  --md-shape-sm:  8px;
  --md-shape-md:  12px;
  --md-shape-lg:  16px;
  --md-shape-xl:  28px;
  --md-shape-full: 100px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Roboto', system-ui, sans-serif;
  background: var(--md-surface);
  color: var(--md-on-surface);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  font-size: 14px;
}

/* ─── App shell ─────────────────────────────────────────────────── */
#app {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ─── Navigation Drawer (Left Pane) ─────────────────────────────── */
#drawer {
  width: 240px;
  flex-shrink: 0;
  background: var(--md-surface-low);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  border-right: 1px solid var(--md-outline-var);
}

/* ─── Explorer (Middle Pane) ────────────────────────────────────── */
#explorer {
  width: 400px;
  flex-shrink: 0;
  background: var(--md-surface-mid);
  border-right: 1px solid var(--md-outline-var);
  display: none; /* Flexible visibility based on app state */
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  animation: slidePane 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slidePane {
  from { width: 0; opacity: 0; }
  to { width: 400px; opacity: 1; }
}

.explorer-header {
  padding: 24px 24px 16px;
  flex-shrink: 0;
}

.explorer-title {
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 4px;
}

.explorer-subtitle {
  font-size: 12px;
  color: var(--md-on-surface-var);
  opacity: 0.7;
}

.explorer-body {
  flex: 1;
  overflow-y: auto;
  padding: 0 12px 24px;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 12px;
  flex-shrink: 0;
}

.brand {
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.25px;
  color: var(--md-on-surface);
}
.brand em { color: var(--md-primary); font-style: normal; font-weight: 500; }

.online-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--md-shape-full);
  background: rgba(108, 255, 185, 0.10);
  font-size: 11px;
  font-weight: 500;
  color: #6CFFC3;
  letter-spacing: 0.04em;
}
.online-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #6CFFC3;
  flex-shrink: 0;
}

/* Drawer scrollable body */
.drawer-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 24px 4px;
}
.section-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--md-on-surface-var);
}
.count-pill {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  padding: 1px 7px;
  border-radius: var(--md-shape-full);
}

/* Nav items (Nodes) — MD3 pill style */
.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 52px;
  padding: 0 16px 0 24px;
  margin: 0 12px 2px 0;
  border-radius: 0 var(--md-shape-xl) var(--md-shape-xl) 0;
  cursor: pointer;
  color: var(--md-on-surface-var);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: background 0.15s;
  user-select: none;
}
.nav-item .ripple {
  position: absolute; inset: 0;
  border-radius: inherit;
  background: var(--md-on-surface);
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}
.nav-item:hover .ripple { opacity: 0.08; }
.nav-item.active { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.nav-item.active .nav-icon { color: var(--md-on-secondary-container); }
.nav-icon { font-size: 20px !important; flex-shrink: 0; color: var(--md-on-surface-var); }
.nav-label-group { display: flex; flex-direction: column; gap: 2px; flex: 1; overflow: hidden; }
.nav-label { font-size: 14px; font-weight: 500; color: inherit; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-sub { font-size: 11px; font-weight: 400; opacity: 0.6; font-family: 'Roboto Mono', monospace; }

.drawer-divider {
  height: 1px;
  background: var(--md-outline-var);
  margin: 8px 0;
}

/* File list items */
.file-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 10px 20px;
  margin: 0 8px 1px 0;
  border-radius: 0 var(--md-shape-md) var(--md-shape-md) 0;
  cursor: pointer;
  transition: background 0.12s;
  user-select: none;
}
.file-item .ripple {
  position: absolute; inset: 0;
  border-radius: inherit;
  background: var(--md-on-surface);
  opacity: 0;
  transition: opacity 0.12s;
  pointer-events: none;
}
.file-item:hover .ripple { opacity: 0.08; }
.file-item.active { background: var(--md-primary-container); }
.file-item.active .file-icon  { color: var(--md-on-primary-container); }
.file-item.active .file-name  { color: var(--md-on-primary-container); }
.file-item.active .file-meta  { color: rgba(234,221,255,0.65); }
.file-icon { font-size: 18px !important; color: var(--md-on-surface-var); flex-shrink: 0; }
.file-body { flex: 1; min-width: 0; }
.file-name  { font-size: 13px; font-weight: 500; color: var(--md-on-surface); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-meta  { font-size: 11px; color: var(--md-on-surface-var); margin-top: 2px; }

/* ─── Drawer Footer — Storage ──────────────────────────────────── */
.drawer-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--md-outline-var);
  padding: 12px 24px 16px;
}
.storage-title   { font-size: 11px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--md-on-surface-var); margin-bottom: 4px; }
.storage-numbers { font-size: 13px; color: var(--md-on-surface); margin-bottom: 8px; }
.storage-track   { height: 4px; border-radius: 2px; background: var(--md-outline-var); overflow: hidden; }
.storage-fill    { height: 100%; border-radius: 2px; background: linear-gradient(90deg, var(--md-primary), #A78BFA); transition: width 0.5s ease; width: 0%; }
.storage-pct     { font-size: 11px; color: var(--md-on-surface-var); margin-top: 5px; }

/* ─── Main Content ──────────────────────────────────────────────── */
#content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background: var(--md-surface);
}

/* Empty state */
#empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 48px;
  text-align: center;
}
.empty-icon     { font-size: 72px !important; color: var(--md-outline); }
.empty-title    { font-size: 22px; font-weight: 400; color: var(--md-on-surface); letter-spacing: 0; }
.empty-subtitle { font-size: 14px; color: var(--md-on-surface-var); line-height: 1.6; }
.kbd {
  display: inline-block;
  padding: 1px 6px;
  background: var(--md-surface-high);
  border: 1px solid var(--md-outline-var);
  border-radius: 4px;
  font-size: 12px;
  font-family: 'Roboto Mono', monospace;
  color: var(--md-on-surface-var);
}

/* ─── Viewer ────────────────────────────────────────────────────── */
#viewer {
  flex: 1;
  display: none;
  flex-direction: column;
  overflow: hidden;
}

/* Top bar */
#viewer-topbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  min-height: 64px;
  background: var(--md-surface-mid);
  border-bottom: 1px solid var(--md-outline-var);
  flex-shrink: 0;
}

/* Icon buttons */
.icon-btn {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  border-radius: var(--md-shape-full);
  border: none;
  background: transparent;
  color: var(--md-on-surface-var);
  cursor: pointer;
  flex-shrink: 0;
  font-size: 20px !important;
  transition: color 0.15s;
}
.icon-btn::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background: var(--md-on-surface);
  opacity: 0;
  transition: opacity 0.15s;
}
.icon-btn:hover:not(:disabled)::before { opacity: 0.08; }
.icon-btn:hover:not(:disabled) { color: var(--md-on-surface); }
.icon-btn:disabled { color: rgba(230, 225, 229, 0.28); cursor: default; }

.topbar-info   { flex: 1; min-width: 0; padding: 0 8px; }
.topbar-name   { font-size: 16px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; letter-spacing: 0.01em; }
.topbar-meta   { font-size: 12px; color: var(--md-on-surface-var); margin-top: 2px; }

.topbar-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; padding-left: 8px; }

/* ─── MD3 Buttons ─────────────────────────────────────────────── */
.btn-tonal {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: 6px;
  height: 36px; padding: 0 16px;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border: none; border-radius: var(--md-shape-full);
  font-family: inherit; font-size: 13px; font-weight: 500;
  letter-spacing: 0.01em; cursor: pointer; white-space: nowrap;
  text-decoration: none;
}
.btn-tonal::before { content: ''; position: absolute; inset: 0; background: var(--md-on-secondary-container); opacity: 0; transition: opacity 0.15s; }
.btn-tonal:hover { box-shadow: 0 1px 2px rgba(0,0,0,.3), 0 1px 3px 1px rgba(0,0,0,.15); }
.btn-tonal:hover::before { opacity: 0.08; }

.btn-outlined {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: 6px;
  height: 36px; padding: 0 16px;
  background: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline); border-radius: var(--md-shape-full);
  font-family: inherit; font-size: 13px; font-weight: 500;
  letter-spacing: 0.01em; cursor: pointer; white-space: nowrap;
}
.btn-outlined::before { content: ''; position: absolute; inset: 0; background: var(--md-primary); opacity: 0; transition: opacity 0.15s; }
.btn-outlined:hover::before { opacity: 0.08; }

.btn-error {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: 6px;
  height: 36px; padding: 0 16px;
  background: var(--md-error-container);
  color: var(--md-on-error-container);
  border: none; border-radius: var(--md-shape-full);
  font-family: inherit; font-size: 13px; font-weight: 500;
  letter-spacing: 0.01em; cursor: pointer; white-space: nowrap;
}
.btn-error::before { content: ''; position: absolute; inset: 0; background: var(--md-on-error-container); opacity: 0; transition: opacity 0.15s; }
.btn-error:hover::before { opacity: 0.08; }

/* Move dropdown */
.move-wrap { position: relative; }
#move-menu {
  display: none;
  position: absolute; top: calc(100% + 6px); right: 0;
  min-width: 172px;
  background: var(--md-surface-high);
  border-radius: var(--md-shape-md);
  box-shadow: 0 4px 8px 3px rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.3);
  overflow: hidden;
  z-index: 300;
  padding: 8px 0;
}
.move-menu-item {
  position: relative;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  font-size: 14px; color: var(--md-on-surface);
  cursor: pointer;
}
.move-menu-item::before { content: ''; position: absolute; inset: 0; background: var(--md-on-surface); opacity: 0; transition: opacity 0.12s; }
.move-menu-item:hover::before { opacity: 0.08; }
.move-menu-empty { padding: 10px 16px; font-size: 14px; color: var(--md-on-surface-var); }

/* ─── Preview area ──────────────────────────────────────────────── */
#preview-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 32px;
  background: var(--md-surface);
}
#preview-area img  { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: var(--md-shape-md); display: block; }
#preview-area video { max-width: 100%; max-height: 100%; border-radius: var(--md-shape-md); }

.code-block {
  width: 100%; align-self: stretch;
  background: var(--md-surface-low);
  color: #A8FF78;
  font-family: 'Roboto Mono', 'Courier New', monospace;
  font-size: 13px; line-height: 1.75;
  padding: 24px 28px;
  border-radius: var(--md-shape-lg);
  border: 1px solid var(--md-outline-var);
  white-space: pre-wrap; word-break: break-word; overflow: auto;
}

.preview-empty {
  display: flex; flex-direction: column; align-items: center;
  gap: 16px; text-align: center;
}
.preview-empty .big-icon { font-size: 64px !important; color: var(--md-outline); }
.preview-empty .p-title  { font-size: 16px; font-weight: 500; color: var(--md-on-surface); }
.preview-empty .p-sub    { font-size: 14px; color: var(--md-on-surface-var); }

/* Loading spinner */
.md-spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--md-outline-var);
  border-top-color: var(--md-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Modal & Inputs ────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  display: none; align-items: center; justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}
.modal {
  background: var(--md-surface-high);
  width: 100%; max-width: 440px;
  border-radius: var(--md-shape-xl);
  padding: 24px;
  box-shadow: 0 12px 24px rgba(0,0,0,0.4);
}
.modal h3 { font-size: 20px; font-weight: 400; color: var(--md-on-surface); margin-bottom: 8px; }

.input-field { margin-bottom: 24px; }
.input-field label { display: block; font-size: 12px; color: var(--md-primary); margin-bottom: 8px; font-weight: 500; }
.input-field input {
  width: 100%; height: 48px;
  background: var(--md-surface-highest);
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-sm);
  padding: 0 16px;
  color: var(--md-on-surface);
  font-family: inherit; font-size: 15px;
}
.input-field input:focus { outline: 2px solid var(--md-primary); border-color: transparent; }

.modal-actions { display: flex; justify-content: flex-end; gap: 8px; }

.icon-btn-small {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: none; background: transparent;
  color: var(--md-on-surface-var); cursor: pointer; transition: background 0.15s;
}
.icon-btn-small:hover { background: rgba(255,255,255,0.1); color: var(--md-primary); }

.btn-primary {
  height: 40px; padding: 0 24px;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--md-primary); color: var(--md-on-primary);
  border: none; border-radius: var(--md-shape-full);
  font-weight: 500; cursor: pointer;
}
.btn-text {
  height: 40px; padding: 0 16px;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: transparent; color: var(--md-primary);
  border: none; font-weight: 500; cursor: pointer;
}

.manager-content {
  flex: 1; overflow: auto; padding: 24px; background: var(--md-surface);
}
.node-table {
  width: 100%; border-collapse: collapse; min-width: 800px;
}
.node-table th {
  text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--md-outline-var);
  font-size: 11px; font-weight: 500; text-transform: uppercase; color: var(--md-on-surface-var);
}
.node-table td {
  padding: 16px; border-bottom: 1px solid var(--md-outline-var); font-size: 14px;
}
.node-table tr:hover { background: rgba(255,255,255,0.02); }
.node-id-chip {
  font-family: 'Roboto Mono', monospace; font-size: 11px; background: var(--md-surface-highest);
  padding: 2px 6px; border-radius: 4px; border: 1px solid var(--md-outline-var);
}
.node-stats-cell { color: var(--md-on-surface-var); font-size: 13px; }
.badge-error {
  font-size: 9px; font-weight: 700; text-transform: uppercase;
  background: var(--md-error-container); color: var(--md-on-error-container);
  padding: 1px 6px; border-radius: 4px; letter-spacing: 0.05em;
}

/* Scrollbars */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--md-outline-var); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--md-outline); }

.breadcrumbs {
  display: flex; align-items: center; gap: 4px; padding: 12px 16px; 
  background: var(--md-surface-container-low); border-bottom: 1px solid var(--md-outline-var);
  font-size: 12px; overflow-x: auto; white-space: nowrap;
}
.breadcrumb-item {
  color: var(--md-primary); cursor: pointer; font-weight: 500;
  padding: 2px 6px; border-radius: 4px;
}
.breadcrumb-item:hover { background: var(--md-primary-container); }
.breadcrumb-sep { color: var(--md-on-surface-var); opacity: 0.5; }

.selection-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 16px; background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-radius: 12px; margin: 8px; font-size: 13px; font-weight: 500;
  animation: slideIn 0.3s ease;
}
@keyframes slideIn { from { transform: translateY(10px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.nav-item.selected {
  background: var(--md-secondary-container-low);
}
.nav-item.selected .nav-icon {
  color: var(--md-secondary);
}

/* ─── Toggle Switch ────────────────────────────────────────────── */
.switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 32px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; cursor: pointer;
  inset: 0;
  background-color: var(--md-outline-var);
  transition: .3s;
  border-radius: 34px;
}
.slider:before {
  position: absolute; content: "";
  height: 24px; width: 24px;
  left: 4px; bottom: 4px;
  background-color: var(--md-on-surface-var);
  transition: .3s;
  border-radius: 50%;
}
input:checked + .slider { background-color: var(--md-primary); }
input:checked + .slider:before {
  transform: translateX(20px);
  background-color: var(--md-on-primary);
}

.drawer-divider {
  height: 1px;
  background: var(--md-outline-var);
  margin: 16px 24px;
  opacity: 0.5;
}

.badge-error {
  background: var(--md-error);
  color: var(--md-on-error);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 10px;
  font-weight: 500;
}

.file-item {
  margin: 0 0 4px 0 !important;
  padding: 12px 16px !important;
  border-radius: var(--md-shape-md) !important;
}

.file-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.file-item.selected {
  background: var(--md-secondary-container);
  border-left: 4px solid var(--md-primary);
}

.file-checkbox-wrap {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: -8px;
  border-radius: 50%;
  transition: background 0.2s;
}
.file-checkbox-wrap:hover {
  background: rgba(255, 255, 255, 0.1);
}
.file-checkbox {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--md-primary);
}

.file-item.selected {
  background: var(--md-secondary-container) !important;
  border-left: 4px solid var(--md-primary);
}
.file-item.active {
  background: var(--md-primary-container);
  box-shadow: inset 0 0 0 1px var(--md-outline-var);
}
.view-toggle {
  display: flex;
  background: var(--md-surface-highest);
  border-radius: var(--md-shape-full);
  padding: 2px;
  border: 1px solid var(--md-outline-var);
}
.toggle-btn {
  width: 32px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--md-on-surface-var);
  border-radius: var(--md-shape-full);
  cursor: pointer;
  transition: all 0.2s;
}
.toggle-btn span { font-size: 18px !important; }
.toggle-btn.active {
  background: var(--md-primary);
  color: var(--md-on-primary);
}

.filter-bar {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--md-outline-var);
}

.dropdown-wrap { position: relative; }
.dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  background: var(--md-surface-high);
  border: 1px solid var(--md-outline-var);
  border-radius: var(--md-shape-sm);
  color: var(--md-on-surface);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
}
.dropdown-trigger span { font-size: 16px !important; }

.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background: var(--md-surface-highest);
  border-radius: var(--md-shape-md);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  z-index: 500;
  min-width: 140px;
  padding: 8px 0;
  border: 1px solid var(--md-outline-var);
}
.dropdown-item {
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.2s;
}
.dropdown-item:hover { background: rgba(255,255,255,0.1); }
.filter-item-chk {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
}
.filter-item-chk input { width: 14px; height: 14px; accent-color: var(--md-primary); }
.filter-item-chk:hover { background: rgba(255,255,255,0.1); }

/* ─── Mobile Responsiveness ──────────────────────────────────────── */
@media (max-width: 768px) {
  #app { position: relative; }
  
  #drawer {
    position: absolute; left: 0; top: 0; bottom: 0; z-index: 800;
    width: 280px; transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 8px 0 16px rgba(0,0,0,0.5);
  }
  #drawer.open { transform: translateX(0); }

  #explorer {
    position: absolute; left: 0; top: 0; bottom: 0; z-index: 700;
    width: 100%; transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  #explorer.open { transform: translateX(0); }

  #content { width: 100%; }

  .mobile-header {
    display: flex !important;
    height: 56px; padding: 0 16px;
    align-items: center; gap: 16px;
    background: var(--md-surface-low);
    border-bottom: 1px solid var(--md-outline-var);
    flex-shrink: 0;
  }

  .explorer-header { padding: 16px; }
  .explorer-title { font-size: 18px; }
  
  #viewer-topbar {
    flex-wrap: wrap; height: auto; padding: 8px;
  }
  .topbar-actions { width: 100%; justify-content: space-around; padding: 8px 0; border-top: 1px solid var(--md-outline-var); margin-top: 8px; }
  
  .code-block { padding: 16px; font-size: 12px; }
  #explorer-close-btn, #drawer-close-btn { display: flex !important; }
}

.mobile-header { display: none; }
.mobile-btn {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: none; background: transparent;
  color: var(--md-on-surface); cursor: pointer;
}