/* ═══════════════════════════════════════════
   APP PAGE — Prevent document-level scroll
   ═══════════════════════════════════════════ */
html,
body {
  height: 100%;
  height: 100dvh;
  overflow: hidden;
}

/* ═══════════════════════════════════════════
   APP BODY & TOPBAR LAYOUT (Header-First)
   ═══════════════════════════════════════════ */
.app-topbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 60px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
  box-sizing: border-box;
}

.app-body {
  margin-top: 60px;
  height: calc(100vh - 60px);
  height: calc(100dvh - 60px);
  display: grid;
  grid-template-columns: 240px 1fr;
  overflow: hidden;
  width: 100%;
}

/* ═══════════════════════════════════════════
   LEFT SIDEBAR NAVIGATION
   ═══════════════════════════════════════════ */
.app-sidebar-nav {
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 10px 14px;
  position: sticky;
  top: 0;
  height: 100%;
  overflow-y: auto;
  z-index: 50;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
  user-select: none;
  -webkit-user-select: none;
}

.app-sidebar-nav::-webkit-scrollbar {
  width: 3px;
}

.app-sidebar-nav::-webkit-scrollbar-thumb {
  background: var(--color-surface-variant);
  border-radius: 3px;
}

.sidebar-nav-top {
  display: flex;
  flex-direction: column;
}

.sidebar-logo {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  text-align: center;
}

/* New Visual Button — solid color, no gradient */
.sidebar-new-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 9px 14px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-main);
  text-decoration: none;
  transition: opacity var(--transition-fast);
  border: none;
  cursor: pointer;
}

.sidebar-new-btn:hover {
  opacity: 0.85;
}

.sidebar-new-btn .material-symbols-outlined {
  font-size: 18px !important;
}

/* Sidebar Menu */
.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-secondary-text);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  cursor: pointer;
}

.sidebar-menu-item:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

.sidebar-menu-item.active {
  background-color: var(--color-surface-variant);
  color: var(--color-primary);
  font-weight: 600;
}

.sidebar-menu-item .material-symbols-outlined {
  font-size: 18px !important;
}

.sidebar-chevron {
  margin-left: auto;
  font-size: 18px !important;
  transition: transform var(--transition-fast);
}

.sidebar-menu-item.open .sidebar-chevron,
.sidebar-sample-trigger.open .sidebar-chevron {
  transform: rotate(180deg);
}

/* Sample Dataset Dropdown */
.sidebar-sample-dropdown {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding-left: 36px;
  margin-bottom: 4px;
}

.sidebar-sample-dropdown.open {
  display: flex;
}

.sidebar-sample-btn {
  padding: 5px 10px;
  border-radius: var(--radius-md);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-secondary-text);
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  font-family: var(--font-main);
}

.sidebar-sample-btn:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

.sidebar-sample-btn.active {
  color: var(--color-indigo);
  font-weight: 600;
}

/* Sidebar Bottom */
.sidebar-nav-bottom {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 14px;
}

.sidebar-theme-toggle {
  display: flex;
  align-items: center;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  overflow: hidden;
  background-color: var(--color-surface-low);
}

.theme-pill {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex: 1;
  padding: 6px 10px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-main);
  color: var(--color-secondary-text);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border-radius: var(--radius-full);
}

.theme-pill.active {
  background-color: var(--color-surface);
  color: var(--color-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.theme-pill .material-symbols-outlined {
  font-size: 14px !important;
}

.sidebar-branding {
  font-size: 10px;
  color: var(--color-outline);
  text-align: center;
  font-weight: 500;
}

/* ═══════════════════════════════════════════
   RIGHT CONTENT AREA
   ═══════════════════════════════════════════ */
.app-content-area {
  display: flex;
  flex-direction: column;
  height: 100%;
  flex: 1 1 0%;
  overflow: hidden;
}

/* ═══════════════════════════════════════════
   TOP BAR (Styles declared at top of file)
   ═══════════════════════════════════════════ */
.app-topbar::-webkit-scrollbar {
  height: 0;
  width: 0;
}

.topbar-logo {
  font-family: var(--font-heading);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-primary);
  text-decoration: none;
  flex-shrink: 0;
  margin-left: 4px;
}

button.sidebar-menu-item {
  border: none;
  background: transparent;
  text-align: left;
  width: 100%;
  font-family: inherit;
  cursor: pointer;
}

/* Panel visibility and transitions */
#workspace-view-panel,
#workspace-history-panel {
  display: flex;
  flex-direction: column;
  gap: 40px;
  width: 100%;
  opacity: 1;
  transition: opacity 0.2s ease-in-out;
}

#workspace-view-panel.fade-out,
#workspace-history-panel.fade-out {
  opacity: 0;
}

.topbar-chart-types {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.topbar-type-btn {
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-main);
  color: var(--color-secondary-text);
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.topbar-type-btn:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  border-color: var(--color-surface-variant);
}

.topbar-type-btn.active {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

/* ═══════════════════════════════════════════
   MAIN CONTENT AREA
   ═══════════════════════════════════════════ */
.app-main {
  flex: 1 1 0%;
  background-color: var(--color-bg);
  overflow-y: auto;
  overflow-x: hidden;
  transition: background-color var(--transition-normal);
}

.main-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ═══════════════════════════════════════════
   SIMPLE PAGE HEADER
   ═══════════════════════════════════════════ */
.page-header {
  margin-bottom: 24px;
  padding: 0 20px;
  text-align: center;
}

.page-title {
  font-family: var(--font-heading);
  font-size: 50px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: 6px;
}

.page-desc {
  font-size: 15px;
  color: var(--color-secondary-text);
  margin: 0 auto;
  line-height: 1.5;
  max-width: 500px;
}

@media (max-width: 768px) {
  .page-header {
    padding: 0 12px;
  }
}

@media (max-width: 640px) {
  .page-header {
    padding: 0 8px;
    margin-bottom: 16px;
  }

  .page-title {
    font-size: 30px;
    margin-top: 20px;
  }

  .page-desc {
    font-size: 12px;
  }
}

/* ═══════════════════════════════════════════
   PRIMARY PAGE HEADER STRIP (SaaS-style)
   ═══════════════════════════════════════════ */
.primary-header-strip {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  border-top: none;
  border-left: none;
  border-right: none;
  border-radius: 0;
  margin: 0;
  box-shadow: none;
  padding: 25px 0;
  width: 100%;
  box-sizing: border-box;
  user-select: none;
}

.header-strip-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  box-sizing: border-box;
}

.header-strip-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  flex-wrap: nowrap;
}

.header-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  color: var(--color-outline);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.breadcrumb-separator {
  color: var(--color-surface-variant);
  font-weight: 400;
}

.breadcrumb-item.active {
  color: var(--color-outline);
  font-weight: 500;
}

.header-title-separator {
  color: var(--color-surface-variant);
  font-size: 12px;
  flex-shrink: 0;
}

.header-title {
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
  margin: 0;
  flex-shrink: 0;
  white-space: nowrap;
}

.header-desc-separator {
  color: var(--color-surface-variant);
  font-size: 12px;
  flex-shrink: 0;
}

.header-desc {
  font-size: 12px;
  color: var(--color-secondary-text);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 400;
}

.header-strip-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Status Badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: 600;
  background-color: var(--color-surface-low);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.status-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-outline);
}

.status-dot.active {
  background-color: var(--color-emerald);
  box-shadow: 0 0 6px var(--color-emerald);
}

.status-dot.waiting {
  background-color: var(--color-orange);
  box-shadow: 0 0 6px var(--color-orange);
}

.status-dot.info {
  background-color: var(--color-indigo);
  box-shadow: 0 0 6px var(--color-indigo);
}

/* ═══════════════════════════════════════════
   WORKSPACE CARD
   ═══════════════════════════════════════════ */
.workspace-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  min-height: 540px;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05), 0 2px 6px -1px rgba(0, 0, 0, 0.03);
}

html.dark .workspace-card {
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.25), 0 2px 6px -1px rgba(0, 0, 0, 0.15);
}

/* Upload Header */
.upload-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.upload-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-icon-box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
}

.file-icon-box .material-symbols-outlined {
  font-size: 18px;
  color: var(--color-primary);
}

.upload-header-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.upload-header-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.upload-header-sub {
  font-size: 11px;
  color: var(--color-secondary-text);
  margin: 0;
}

/* Toolbar Row */
.toolbar-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 22px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: opacity var(--transition-fast);
  border: none;
}

.toolbar-btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

.toolbar-btn-primary:hover {
  opacity: 0.85;
}

.toolbar-btn-primary .material-symbols-outlined {
  font-size: 14px !important;
}

.toolbar-btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.toolbar-btn-outline:hover {
  background-color: var(--color-surface-low);
}

.toolbar-select {
  padding: 6px 26px 6px 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  font-family: var(--font-main);
  font-size: 12px;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%236B6B6B' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
}

html.dark .toolbar-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%239A9895' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

.upload-input {
  display: none;
}

/* Data Tabs */
.data-tabs-row {
  display: flex;
  padding: 0 16px;
  border-bottom: 1px solid var(--color-border);
  gap: 0;
}

.data-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-secondary-text);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-family: var(--font-main);
  transition: color var(--transition-fast);
}

.data-tab .material-symbols-outlined {
  font-size: 16px !important;
}

.data-tab:hover {
  color: var(--color-primary);
}

.data-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}

/* Paste / Drop Area */
.paste-area {
  height: 380px;
  padding: 0;
  position: relative;
  box-sizing: border-box;
}

.paste-input {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  color: var(--color-primary);
  padding: 10px 14px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
  resize: none;
  outline: none;
  line-height: 1.5;
  -webkit-user-select: text;
  user-select: text;
  overflow-y: auto;
  box-sizing: border-box;
}

.paste-input::placeholder {
  color: var(--color-outline);
}

/* Drag Over State */
.paste-area.dragover,
#drop-zone.dragover {
  background-color: rgba(99, 102, 241, 0.04);
  outline: 2px dashed var(--color-indigo);
  outline-offset: -4px;
  border-radius: var(--radius-md);
}

/* ═══════════════════════════════════════════
   EDIT DATA ACTION BAR
   ═══════════════════════════════════════════ */
.edit-data-bar {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  gap: 8px;
  transition: background-color var(--transition-normal);
}

/* Show when data is loaded — JS sets display via style */

.edit-data-bar-left {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.edit-data-bar-icon {
  font-size: 16px !important;
  color: var(--color-emerald);
  flex-shrink: 0;
}

.edit-data-bar-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.edit-data-bar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
}

.edit-data-btn,
.clear-data-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 28px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  box-sizing: border-box;
}

.edit-data-btn {
  color: var(--color-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-outline);
}

.edit-data-btn:hover {
  background-color: var(--color-surface-variant);
}

.edit-data-btn .material-symbols-outlined {
  font-size: 16px !important;
}

.clear-data-btn {
  color: var(--color-error);
  background-color: var(--color-surface);
  border: 1px solid var(--color-error);
}

.clear-data-btn:hover {
  background-color: rgba(186, 26, 26, 0.05);
  /* light red hover tint */
}

.clear-data-btn .material-symbols-outlined {
  font-size: 16px !important;
}

/* ═══════════════════════════════════════════
   CONFIG CARD HEADER
   ═══════════════════════════════════════════ */
.config-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  user-select: none;
}

.config-header-icon {
  font-size: 20px !important;
  color: var(--color-secondary-text);
}

.config-header-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.config-header-title {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.config-header-desc {
  font-size: 11px;
  color: var(--color-secondary-text);
  margin: 0;
}

/* Columns Config Pane Grid Layout */
.columns-config {
  padding: 20px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 28px;
  align-items: start;
}

#config-section {
  min-height: auto;
}

.config-pane-left {
  border-right: 1px solid var(--color-border);
  padding-right: 28px;
}

@media (max-width: 820px) {
  .columns-config {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 16px;
  }

  .config-pane-left {
    border-right: none;
    padding-right: 0;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 20px;
  }
}

.col-config-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 5px;
}

.col-config-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-secondary-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.select-control {
  width: 100%;
  padding: 7px 10px;
  border-radius: 50px;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  font-family: var(--font-main);
  font-size: 12px;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%236B6B6B' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
  transition: border-color var(--transition-fast);
}

html.dark .select-control {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%239A9895' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

.select-control:focus {
  outline: none;
  border-color: var(--color-primary);
}

.x-pills-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.x-pill-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 14px;
  border-radius: 50px !important;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  color: var(--color-secondary-text);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast) ease;
  font-family: var(--font-main);
  user-select: none;
}

.x-pill-btn:hover {
  background-color: var(--color-surface-variant);
  border-color: var(--color-primary);
}

.x-pill-btn.active {
  background-color: var(--color-primary) !important;
  color: var(--color-on-primary) !important;
  border-color: var(--color-primary) !important;
}

.y-checklist-container {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.y-checklist-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 14px;
  border-radius: 50px !important;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  color: var(--color-secondary-text);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast) ease;
  font-family: var(--font-main);
  user-select: none;
}

.y-checklist-item:hover {
  background-color: var(--color-surface-variant);
  border-color: var(--color-primary);
}

.y-checklist-item:has(input:checked) {
  background-color: var(--color-primary) !important;
  color: var(--color-on-primary) !important;
  border-color: var(--color-primary) !important;
}

.y-checklist-item.disabled-pill {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.checkbox-control {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.config-axes-row {
  display: flex;
  flex-direction: column;
}

.col-config-toggles {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding-top: 2px;
}

.toggle-inline {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--color-primary);
  cursor: pointer;
}

.toggle-inline input {
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* Config Section Pill-shaped toggle buttons */
.config-pill-btn {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 16px;
  border-radius: 50px;
  border: 1.5px solid var(--color-border);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-secondary-text);
  background-color: transparent;
  transition: all var(--transition-fast);
  user-select: none;
  font-family: var(--font-main);
  white-space: nowrap;
}

.config-pill-btn:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  border-color: var(--color-outline);
}

.config-pill-btn.active {
  border-color: var(--color-primary);
  color: var(--color-on-primary);
  background-color: var(--color-primary);
  font-weight: 600;
}

/* Checkbox indicator inside config-pill-btn */
.pill-check-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.5px solid var(--color-secondary-text);
  display: inline-block;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  position: relative;
}

.config-pill-btn:hover .pill-check-indicator {
  border-color: var(--color-primary);
}

.config-pill-btn.active .pill-check-indicator {
  border-color: var(--color-on-primary);
  background-color: var(--color-on-primary);
}

.config-pill-btn.active .pill-check-indicator::after {
  content: '';
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
  width: 3px;
  height: 6px;
  border: solid var(--color-primary);
  border-width: 0 1.5px 1.5px 0;
}

/* ═══════════════════════════════════════════
   GENERATE BUTTON — solid color, no gradient
   ═══════════════════════════════════════════ */
.step-action-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
}

.generate-btn {
  padding: 9px 28px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  border: none;
  transition: opacity var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.generate-btn:hover {
  opacity: 0.85;
}

.generate-btn:active {
  opacity: 0.75;
}

.generate-btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.generate-btn .material-symbols-outlined {
  font-size: 16px !important;
}

/* ═══════════════════════════════════════════
   STATS SUMMARY ROW
   ═══════════════════════════════════════════ */
.stats-summary-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 12px 16px 0;
}

.stat-card {
  padding: 8px 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.stat-card-header {
  display: flex;
  align-items: center;
  gap: 5px;
}

.stat-icon {
  font-size: 14px !important;
}

.icon-rows {
  color: var(--color-orange);
}

.icon-cols {
  color: var(--color-blue);
}

.icon-series {
  color: var(--color-indigo);
}

.icon-quality {
  color: var(--color-emerald);
}

.stat-label {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-secondary-text);
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.2;
}

/* ═══════════════════════════════════════════
   CHART OUTPUT
   ═══════════════════════════════════════════ */
.chart-output-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 10px 16px 0;
  background-color: #FEFCF8;
  transition: background-color var(--transition-normal);
}

html.dark .chart-output-body {
  background-color: #181816;
}

.chart-output-header {
  margin-bottom: 8px;
}

.chart-title-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1.5px solid transparent;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 2px 0;
  outline: none;
  transition: border-color var(--transition-fast);
  -webkit-user-select: text;
  user-select: text;
}

.chart-title-input:focus {
  border-bottom-color: var(--color-primary);
}

.chart-title-input::placeholder {
  color: var(--color-outline);
}

/* Chart Canvas */
/* Editable Chart Title Bar (Header) */
.chart-canvas-title-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  position: relative;
  min-height: 48px;
  border-bottom: 1.5px solid var(--color-border);
  /* Solid separator line after header */
  background-color: #FEFCF8;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

html.dark .chart-canvas-title-bar {
  background-color: #181816;
}

.chart-canvas-title-center {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 2;
  text-align: center;
}

/* Custom HTML Legend in Header */
.chart-canvas-legend-left {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 500;
}

.legend-item-custom {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
  color: var(--color-secondary-text);
  transition: color var(--transition-fast) ease;
}

.legend-item-custom:hover {
  color: var(--color-primary);
}

.legend-line-custom {
  width: 14px;
  height: 3px;
  border-radius: 2px;
  display: inline-block;
}

.chart-canvas-title-display {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  padding: 4px 12px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  user-select: none;
  max-width: 80%;
  text-align: center;
  word-break: break-word;
}

.chart-canvas-title-display::after {
  content: 'edit';
  font-family: 'Material Symbols Outlined';
  font-size: 14px;
  opacity: 0;
  color: var(--color-outline);
  transition: opacity var(--transition-fast);
  margin-left: 2px;
}

.chart-canvas-title-display:hover {
  background-color: var(--color-surface-low);
  box-shadow: 0 0 0 1px var(--color-border);
}

.chart-canvas-title-display:hover::after {
  opacity: 1;
}

.chart-canvas-title-edit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 400px;
}

.chart-canvas-title-input {
  width: 100%;
  text-align: center;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-surface-low);
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 5px 14px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.chart-canvas-title-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.18);
}

.chart-canvas-title-input::placeholder {
  color: var(--color-outline);
  font-weight: 400;
}

.chart-canvas-wrapper {
  position: relative;
  width: 100%;
  flex: 1;
  min-height: 480px;
  background-color: #FEFCF8;
  transition: background-color var(--transition-normal);
}

html.dark .chart-canvas-wrapper {
  background-color: #181816;
}

#chart-container {
  width: 100%;
  height: 100%;
  min-height: 480px;
}

/* Chart Canvas Options Toolbar */
.chart-canvas-toolbar {
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
  padding: 10px 20px;
  border-bottom: none;
  background-color: #FEFCF8;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

html.dark .chart-canvas-toolbar {
  background-color: #181816;
}

.toolbar-toggles-group,
.toolbar-actions-group {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

/* Custom Checkbox Pill Styling */
.toolbar-toggle-pill {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: 50px;
  border: 1.5px solid var(--color-border);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-secondary-text);
  background-color: transparent;
  transition: all var(--transition-fast);
  user-select: none;
  font-family: var(--font-main);
}

.toolbar-toggle-pill:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  border-color: var(--color-outline);
}

.toolbar-toggle-pill.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: transparent;
  /* styled like a pill outline */
  font-weight: 600;
}

/* Custom Checkbox Icon */
.custom-checkbox {
  width: 12px;
  height: 12px;
  border: 1.5px solid var(--color-outline);
  border-radius: 3px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast) ease;
  flex-shrink: 0;
  position: relative;
  background-color: transparent;
}

.toolbar-toggle-pill:hover .custom-checkbox {
  border-color: var(--color-primary);
}

.toolbar-toggle-pill.active .custom-checkbox {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
}

.toolbar-toggle-pill.active .custom-checkbox::after {
  content: '';
  position: absolute;
  top: 1px;
  left: 3px;
  width: 3px;
  height: 5px;
  border: solid white;
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

/* Advanced Actions Styling */
.toolbar-action-pill {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border-radius: 50px;
  border: 1.2px solid var(--color-border);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-secondary-text);
  background-color: transparent;
  transition: all var(--transition-fast);
}

.toolbar-action-pill:hover,
.toolbar-action-pill.active {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  border-color: var(--color-outline);
}

.toolbar-action-pill.icon-only {
  padding: 6px;
  aspect-ratio: 1;
  justify-content: center;
}

/* Dropdown Wrapper & Menus */
.toolbar-dropdown-wrapper {
  position: relative;
  display: inline-block;
}

.toolbar-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 6px;
  z-index: 1000;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 6px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 150px;
}

.toolbar-dropdown-menu .dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 10px;
  font-family: var(--font-main);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-secondary-text);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.toolbar-dropdown-menu .dropdown-item:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

.toolbar-dropdown-menu .dropdown-item .material-symbols-outlined {
  font-size: 16px;
}

/* Color previews in palette dropdown */
.color-preview {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.color-preview.classic {
  background-color: #6366f1;
}

.color-preview.vibrant {
  background-color: #ff3e00;
}

.color-preview.orange {
  background-color: #ff6b35;
}

.color-preview.forest {
  background-color: #2d6a4f;
}

.color-preview.ocean {
  background-color: #0077b6;
}

.color-preview.monochrome {
  background-color: #212529;
}

.toolbar-action-pill {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border-radius: 50px;
  border: 1.2px solid var(--color-border);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-secondary-text);
  background-color: transparent;
  transition: all var(--transition-fast);
}

.toolbar-action-pill:hover,
.toolbar-action-pill.active {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  border-color: var(--color-outline);
}

/* Style Popover Dropdown */
.style-popover {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 6px;
  z-index: 100;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 170px;
  text-align: left;
}

.popover-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.popover-label {
  font-size: 9px;
  font-weight: 600;
  color: var(--color-outline);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.popover-select {
  width: 100%;
  font-size: 11px;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  font-family: var(--font-main);
  outline: none;
}

/* Legend Color Picker Popover */
.legend-color-popover {
  position: absolute;
  z-index: 200;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 12px 14px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.14), 0 2px 8px rgba(0, 0, 0, 0.08);
  min-width: 190px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

html.dark .legend-color-popover {
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35), 0 2px 8px rgba(0, 0, 0, 0.2);
}

.legend-color-popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.legend-color-series-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

.legend-color-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--color-secondary-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.legend-color-close:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

.legend-color-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
}

.legend-color-swatch {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.legend-color-swatch:hover {
  transform: scale(1.15);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.legend-color-swatch.selected {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-primary);
}

.legend-color-custom-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 6px;
  border-top: 1px solid var(--color-border);
}

.legend-color-custom-input {
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  background: none;
}

.legend-color-custom-input::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.legend-color-custom-input::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

.legend-color-custom-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-secondary-text);
}

/* Chart Export Footer */
.chart-export-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  margin-top: auto;
  flex-wrap: wrap;
  gap: 8px;
  transition: background-color var(--transition-normal);
}

.export-controls-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.export-icon {
  font-size: 16px !important;
  color: var(--color-secondary-text);
}

.export-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-secondary-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Step buttons */
.step-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: var(--radius-md);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-main);
  border: 1px solid transparent;
  transition: opacity var(--transition-fast);
}

.step-btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

.step-btn-primary:hover {
  opacity: 0.85;
}

.step-btn .material-symbols-outlined {
  font-size: 14px !important;
}

/* ═══════════════════════════════════════════
   SECTION REVEAL ANIMATIONS
   ═══════════════════════════════════════════ */
.hidden-section {
  opacity: 0;
  max-height: 0 !important;
  min-height: 0 !important;
  overflow: hidden;
  transform: translateY(12px);
  transition: opacity 0.4s ease,
    max-height 0.4s ease,
    min-height 0.4s ease,
    transform 0.4s ease,
    margin-top 0.4s ease;
  margin-top: 0;
}

.revealed-section {
  opacity: 1;
  max-height: 2000px;
  min-height: 620px;
  transform: translateY(0);
  margin-top: 10px;
  overflow: visible;
}

/* ═══════════════════════════════════════════
   INSPECTOR BADGE
   ═══════════════════════════════════════════ */
.inspector-badge {
  font-size: 10px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-secondary-text);
  white-space: nowrap;
}

/* ═══════════════════════════════════════════
   TOAST NOTIFICATIONS
   ═══════════════════════════════════════════ */
.toast-notification {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
  font-family: var(--font-main);
  animation: slideUpFade 0.2s ease-out;
  max-width: 400px;
}

.toast-notification.error {
  border-color: var(--color-error);
  background-color: var(--color-surface);
}

.toast-notification .toast-icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  flex-shrink: 0;
  background-color: rgba(186, 26, 26, 0.08);
  border: 1.2px solid rgba(186, 26, 26, 0.15);
}

.toast-notification .toast-icon-container .material-symbols-outlined {
  font-size: 18px !important;
  color: var(--color-error);
}

.toast-notification .toast-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex-grow: 1;
}

.toast-notification .toast-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.25;
}

.toast-notification .toast-description {
  font-size: 11.5px;
  color: var(--color-secondary-text);
  line-height: 1.35;
}

.toast-notification .toast-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: transparent;
  border: none;
  color: var(--color-outline);
  cursor: pointer;
  border-radius: 50%;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  margin-left: 4px;
}

.toast-notification .toast-close-btn:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

@keyframes slideUpFade {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ═══════════════════════════════════════════
   COLOR PICKER IN Y CHECKLIST
   ═══════════════════════════════════════════ */
.color-picker-wrapper {
  display: inline-flex;
  align-items: center;
  margin-left: auto;
  gap: 4px;
  position: relative;
}

.color-picker-control {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: none;
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  flex-shrink: 0;
}

.color-picker-control::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-picker-control::-webkit-color-swatch {
  border: none;
  border-radius: 50%;
}

.color-picker-control::-moz-color-swatch {
  border: none;
  border-radius: 50%;
}

/* ═══════════════════════════════════════════
   EDIT DATA MODAL OVERLAY
   ═══════════════════════════════════════════ */
.edit-data-overlay {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.edit-data-overlay.open {
  opacity: 1;
  visibility: visible;
}

.edit-data-modal {
  display: flex;
  flex-direction: column;
  width: 92vw;
  max-width: 920px;
  height: 80vh;
  max-height: 700px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.edit-data-overlay.open .edit-data-modal {
  transform: translateY(0) scale(1);
}

/* Modal Header */
.edm-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  user-select: none;
}

.edm-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.edm-header-icon {
  font-size: 20px !important;
  color: var(--color-primary);
}

.edm-title {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.edm-badge {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-low);
  border: 1px solid var(--color-border);
  color: var(--color-secondary-text);
}

.edm-header-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.edm-collapse-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font-main);
  color: var(--color-secondary-text);
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.edm-collapse-btn:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

.edm-collapse-btn .material-symbols-outlined {
  font-size: 14px !important;
}

/* Modal Toolbar */
.edm-toolbar {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 20px;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
  flex-shrink: 0;
  flex-wrap: wrap;
  user-select: none;
}

.edm-tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  font-family: var(--font-main);
  color: var(--color-secondary-text);
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.edm-tool-btn:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

.edm-tool-btn .material-symbols-outlined {
  font-size: 13px !important;
}

.edm-tool-danger {
  color: var(--color-error);
  border-color: rgba(186, 26, 26, 0.15);
}

.edm-tool-danger:hover {
  background-color: rgba(186, 26, 26, 0.05);
  color: var(--color-error);
}

.edm-toolbar-divider {
  width: 1px;
  height: 18px;
  background-color: var(--color-border);
  margin: 0 3px;
  flex-shrink: 0;
}

/* Modal Spreadsheet Grid */
.edm-grid-wrapper {
  flex: 1 1 0%;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.edm-grid-scroll {
  width: 100%;
  height: 100%;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.edm-grid-scroll::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.edm-grid-scroll::-webkit-scrollbar-track {
  background: var(--color-surface-low);
}

.edm-grid-scroll::-webkit-scrollbar-thumb {
  background: var(--color-surface-variant);
  border-radius: 3px;
}

.edm-grid-scroll::-webkit-scrollbar-corner {
  background: var(--color-surface-low);
}

.edm-table {
  width: max-content;
  min-width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  font-family: var(--font-main);
  table-layout: auto;
}

/* Row number column */
.edm-table th.edm-row-num-header,
.edm-table td.edm-row-num {
  width: 40px;
  min-width: 40px;
  max-width: 40px;
  text-align: center;
  color: var(--color-outline);
  font-size: 10px;
  font-weight: 600;
  background-color: var(--color-surface-low);
  border-right: 1px solid var(--color-border);
  user-select: none;
  position: sticky;
  left: 0;
  z-index: 2;
}

.edm-table th {
  padding: 0;
  background-color: var(--color-surface-low);
  border-bottom: 2px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 3;
  user-select: none;
}

.edm-table th.edm-row-num-header {
  z-index: 4;
}

.edm-th-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 5px;
  padding: 7px 10px;
  min-width: 90px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.edm-th-inner:hover {
  background-color: var(--color-surface-variant);
}

.edm-th-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.edm-th-type {
  font-size: 8px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-indigo);
  padding: 1px 4px;
  background-color: rgba(99, 102, 241, 0.08);
  border-radius: 3px;
  flex-shrink: 0;
}

.edm-th-delete {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: transparent;
  border: none;
  color: var(--color-outline);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}

.edm-th-inner:hover .edm-th-delete {
  opacity: 1;
}

.edm-th-delete:hover {
  background-color: rgba(186, 26, 26, 0.1);
  color: var(--color-error);
}

.edm-th-delete .material-symbols-outlined {
  font-size: 11px !important;
}

/* Data cells */
.edm-table td {
  padding: 0;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid rgba(0, 0, 0, 0.03);
  position: relative;
}

html.dark .edm-table td {
  border-right: 1px solid rgba(255, 255, 255, 0.02);
}

.edm-cell-input {
  width: 100%;
  min-width: 70px;
  padding: 6px 10px;
  border: none;
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-main);
  font-size: 12px;
  outline: none;
}

.edm-cell-input:focus {
  background-color: rgba(99, 102, 241, 0.04);
  box-shadow: inset 0 0 0 2px var(--color-primary);
}

.edm-table tr:hover td {
  background-color: rgba(0, 0, 0, 0.01);
}

html.dark .edm-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.01);
}

.edm-table tr:hover td.edm-row-num {
  background-color: var(--color-surface-variant);
}

.edm-row-delete {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  min-width: 40px;
  max-width: 40px;
  background-color: var(--color-surface-low);
  border-right: 1px solid var(--color-border);
  position: sticky;
  left: 0;
  z-index: 2;
  cursor: pointer;
  padding: 0;
  border-bottom: 1px solid var(--color-border);
  height: 30px;
}

.edm-row-delete:hover {
  background-color: rgba(186, 26, 26, 0.06);
}

.edm-row-delete .edm-row-num-text {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-outline);
  transition: opacity var(--transition-fast);
}

.edm-row-delete .edm-row-del-icon {
  position: absolute;
  font-size: 12px !important;
  color: var(--color-error);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.edm-row-delete:hover .edm-row-num-text {
  opacity: 0;
}

.edm-row-delete:hover .edm-row-del-icon {
  opacity: 1;
}

/* Header edit input */
.edm-th-edit-input {
  width: 100%;
  padding: 6px 8px;
  border: none;
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 600;
  outline: none;
  box-shadow: inset 0 0 0 2px var(--color-primary);
}

/* Modal Footer */
.edm-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-low);
  flex-shrink: 0;
  gap: 10px;
  flex-wrap: wrap;
}

.edm-footer-left {
  display: flex;
  align-items: center;
  gap: 5px;
}

.edm-footer-icon {
  font-size: 13px !important;
  color: var(--color-outline);
}

.edm-footer-hint {
  font-size: 11px;
  color: var(--color-outline);
}

.edm-footer-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.edm-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.edm-btn-ghost {
  background: transparent;
  color: var(--color-secondary-text);
  border-color: var(--color-border);
}

.edm-btn-ghost:hover {
  background-color: var(--color-surface-variant);
  color: var(--color-primary);
}

.edm-btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

.edm-btn-primary:hover {
  opacity: 0.85;
}

.edm-btn-primary .material-symbols-outlined {
  font-size: 13px !important;
}

/* ═══════════════════════════════════════════
   TABLE SCROLL CONTAINER (for data inspector)
   ═══════════════════════════════════════════ */
.table-scroll-container {
  overflow-x: auto;
  overflow-y: auto;
  max-height: 160px;
}

.table-scroll-container::-webkit-scrollbar {
  height: 4px;
}

.table-scroll-container::-webkit-scrollbar-thumb {
  background: var(--color-surface-variant);
  border-radius: 3px;
}

.table-scroll-container table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 12px;
}

.table-scroll-container th,
.table-scroll-container td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table-scroll-container th {
  background-color: var(--color-surface-low);
  font-weight: 600;
  font-size: 11px;
  color: var(--color-secondary-text);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  position: sticky;
  top: 0;
  z-index: 1;
}

.table-scroll-container td {
  color: var(--color-primary);
  -webkit-user-select: text;
  user-select: text;
}

/* ═══════════════════════════════════════════
   MOBILE RESPONSIVE
   ═══════════════════════════════════════════ */
/* Sidebar responsive constraints removed to keep side-by-side active */

@media (max-width: 768px) {
  .main-container {
    padding: 10px 12px 30px;
    gap: 8px;
  }

  .stats-summary-row {
    grid-template-columns: repeat(2, 1fr);
  }


  .topbar-chart-types {
    gap: 3px;
  }

  .topbar-type-btn {
    padding: 4px 8px;
    font-size: 10px;
  }
}

@media (max-width: 640px) {
  .main-container {
    padding: 8px 8px 24px;
    gap: 6px;
  }

  .toolbar-row {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .chart-export-footer {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
}

/* Modal Responsive */
@media (max-width: 768px) {
  .edit-data-modal {
    width: 98vw;
    height: 90vh;
    max-height: none;
    border-radius: var(--radius-md);
  }

  .edm-header {
    padding: 10px 14px;
  }

  .edm-toolbar {
    padding: 6px 14px;
  }

  .edm-footer {
    padding: 8px 14px;
  }

  .edm-footer-left {
    display: none;
  }

  .edm-collapse-btn span:not(.material-symbols-outlined) {
    display: none;
  }
}

/* ═══════════════════════════════════════════
   WORKSPACE EXCEL GRID PREVIEW
   ═══════════════════════════════════════════ */
.workspace-grid-container {
  height: 380px;
  max-height: 400px;
  overflow: auto;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
  position: relative;
}

/* Custom Scrollbars for Workspace Excel Grid */
.workspace-grid-container::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.workspace-grid-container::-webkit-scrollbar-track {
  background: var(--color-surface-low);
}

.workspace-grid-container::-webkit-scrollbar-thumb {
  background: var(--color-surface-variant);
  border-radius: 3px;
}

.workspace-grid-container::-webkit-scrollbar-corner {
  background: var(--color-surface-low);
}

.workspace-excel-table {
  width: max-content;
  min-width: 100%;
  border-collapse: collapse;
  font-family: var(--font-main);
  font-size: 12px;
}

/* Column headers */
.workspace-excel-table th {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 11px;
  border-bottom: 2px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 3;
  padding: 0;
  user-select: none;
}

.workspace-excel-table th.excel-row-num-header {
  width: 50px;
  min-width: 50px;
  max-width: 50px;
  text-align: center;
  position: sticky;
  left: 0;
  z-index: 4;
  background-color: var(--color-surface-low);
  border-right: 2px solid var(--color-border);
}

.excel-th-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  min-width: 100px;
}

.excel-th-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.excel-th-type {
  font-size: 8px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-indigo);
  padding: 1px 4px;
  background-color: rgba(99, 102, 241, 0.08);
  border-radius: 3px;
  flex-shrink: 0;
}

/* Cells */
.workspace-excel-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  color: var(--color-primary);
  background-color: var(--color-surface);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  vertical-align: middle;
}

.workspace-excel-table td.excel-row-num {
  text-align: center;
  font-size: 10px;
  font-weight: 600;
  color: var(--color-outline);
  background-color: var(--color-surface-low);
  position: sticky;
  left: 0;
  z-index: 2;
  border-right: 2px solid var(--color-border);
  user-select: none;
  width: 50px;
  min-width: 50px;
  max-width: 50px;
}

.excel-cell-val {
  display: block;
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Hover effects */
.workspace-excel-table tr:hover td {
  background-color: var(--color-surface-variant);
}

.workspace-excel-table tr:hover td.excel-row-num {
  background-color: var(--color-surface-variant);
}

.workspace-grid-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-outline);
  gap: 8px;
  padding: 40px;
}

.workspace-grid-empty span {
  font-size: 48px;
}

.workspace-grid-empty p {
  font-size: 13px;
  margin: 0;
}

/* ═══════════════════════════════════════════
   VISUAL HISTORY DASHBOARD
   ═══════════════════════════════════════════ */
.history-view-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
  width: 100%;
}

/* Premium mockup matching empty state container */
.history-empty-container-mockup {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  gap: 16px;
  width: 100%;
}

.history-empty-icon-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: rgba(99, 102, 241, 0.08);
  color: var(--color-indigo, #6366f1);
  border: 1px solid rgba(99, 102, 241, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
}

.history-empty-icon-circle .material-symbols-outlined {
  font-size: 26px !important;
}

.history-empty-title-mockup {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.history-empty-desc-mockup {
  font-family: var(--font-main);
  font-size: 13px;
  color: var(--color-outline);
  max-width: 480px;
  line-height: 1.6;
  margin: 0;
}

/* Adjust circle theme colors for dark mode dynamically */
html.dark .history-empty-icon-circle {
  background-color: rgba(99, 102, 241, 0.15);
  color: #9fa2fc;
  border-color: rgba(99, 102, 241, 0.3);
}

/* Non-card structured mockup history layout */
.history-archive-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
}

.history-archive-title-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
}

.history-archive-title {
  font-family: var(--font-heading);
  font-size: 42px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

.history-archive-desc {
  font-size: 13px;
  color: var(--color-outline);
  margin: 0;
  letter-spacing: 0.01em;
}

.history-clear-all-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-main);
}

.history-clear-all-btn:hover {
  background-color: var(--color-surface-variant);
  border-color: var(--color-outline);
}

/* History list wrapper without grid shadow, plain table matching mockup */
.history-list-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}

.history-list-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-family: var(--font-main);
  font-size: 13px;
}

.history-list-table th {
  background-color: var(--color-surface-low);
  color: var(--color-outline);
  font-weight: 600;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 12px 20px;
  border-bottom: 1px solid var(--color-border);
  user-select: none;
}

.history-list-row {
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast);
}

.history-list-row:last-child {
  border-bottom: none;
}

.history-list-row:hover {
  background-color: var(--color-surface-variant);
}

.history-list-row td {
  padding: 16px 20px;
  color: var(--color-primary);
  vertical-align: middle;
}

/* Monospace Filename */
.history-filename-monospace {
  font-family: 'Space Grotesk', 'Courier New', Courier, monospace;
  font-weight: 600;
  font-size: 13px;
  color: var(--color-primary);
  white-space: nowrap;
}

/* Orange badges styled like the mockup image */
.history-badge-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Accented Pill Badges */
.history-badge-pill.chart-line,
.history-badge-pill.chart-area {
  background-color: rgba(99, 102, 241, 0.06);
  color: var(--color-indigo, #6366f1);
  border: 1px solid rgba(99, 102, 241, 0.18);
}

.history-badge-pill.chart-bar {
  background-color: #eefdf5;
  color: #10b981;
  border: 1px solid #cffada;
}

.history-badge-pill.chart-scatter {
  background-color: #f0f7fe;
  color: #3b82f6;
  border: 1px solid #d0e7fc;
}

.history-badge-pill.chart-pie {
  background-color: #fef1f6;
  color: #ec4899;
  border: 1px solid #fcd5e6;
}

.history-badge-pill.chart-histogram {
  background-color: #f5f3ff;
  color: #8b5cf6;
  border: 1px solid #e5dbff;
}

.history-size-text {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-outline);
}

.history-when-text {
  font-size: 12px;
  color: var(--color-outline);
}

/* Action columns mockup matching */
.action-buttons-cell-mockup {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.history-import-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: transparent;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
  transition: opacity var(--transition-fast);
}

.history-import-link:hover {
  opacity: 0.8;
}

.import-arrow {
  font-weight: 700;
  font-size: 13px;
  transition: transform var(--transition-fast);
}

.history-import-link:hover .import-arrow {
  transform: translateX(3px);
}

/* Clean square action buttons */
.history-action-square-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-outline);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.history-action-square-btn:hover {
  background-color: var(--color-surface-variant);
  color: var(--color-primary);
  border-color: var(--color-outline);
}

.history-action-square-btn.history-btn-delete:hover {
  border-color: rgba(239, 68, 68, 0.4);
  color: var(--color-red, #ef4444);
  background-color: rgba(239, 68, 68, 0.05);
}



/* ═══════════════════════════════════════════
   PRIMARY HEADER STRIP RESPONSIVE ADAPTATIONS
   ═══════════════════════════════════════════ */
@media (max-width: 768px) {
  .primary-header-strip {
    padding: 16px 0;
  }

  .header-strip-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 0 12px;
  }

  .header-strip-actions {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .primary-header-strip {
    padding: 14px 0;
  }

  .header-strip-inner {
    padding: 0 8px;
  }

  .header-title {
    font-size: 20px;
  }

  .header-desc {
    font-size: 12px;
  }
}

/* ═══════════════════════════════════════════
   HOW TO USE BUTTON & POPUP MODAL
   ═══════════════════════════════════════════ */

/* Pill-shaped Button in Upload Header */
.how-to-use-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-indigo);
  border: 1px solid #121212;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.how-to-use-btn:hover {
  border-color: #121212;
}

.how-to-use-btn .material-symbols-outlined {
  font-size: 16px !important;
}

html.dark .how-to-use-btn {
  background-color: transparent;
  border-color: #ffffff;
  color: #ffffff;
}

html.dark .how-to-use-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
}

/* Modal Overlay Backdrop */
.how-to-use-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.how-to-use-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

/* Modal Window Container */
.how-to-use-modal {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 540px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px);
  transition: transform var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal);
}

.how-to-use-overlay.open .how-to-use-modal {
  transform: translateY(0);
}

/* Modal Header Section */
.htu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}

.htu-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.htu-header-icon {
  color: var(--color-indigo);
  font-size: 22px !important;
}

.htu-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.htu-close-btn {
  color: var(--color-secondary-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  transition: color var(--transition-fast);
}

.htu-close-btn:hover {
  color: var(--color-primary);
}

/* Modal Body Content */
.htu-content {
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-height: 60vh;
  overflow-y: auto;
}

.htu-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.htu-step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--color-indigo);
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.htu-step-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.htu-step-text h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.htu-step-text p {
  font-size: 12px;
  line-height: 1.5;
  color: var(--color-secondary-text);
  margin: 0;
}

/* Modal Footer Section */
.htu-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
}

.htu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 24px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-main);
  transition: all var(--transition-fast);
}

.htu-btn-primary {
  background-color: var(--color-indigo);
  color: #ffffff;
  border: none;
}

html.dark .htu-btn-primary {
  color: #121212;
}

@media (max-width: 640px) {
  .htu-title {
    font-size: 16px;
  }

  .how-to-use-btn span:not(.material-symbols-outlined) {
    display: none;
  }

  .how-to-use-btn {
    padding: 8px;
  }
}

/* ═══════════════════════════════════════════
   CHART TITLE STYLE EDITOR POPOVER STYLES
   ═══════════════════════════════════════════ */
.chart-style-popover {
  position: absolute;
  top: 104px;
  right: 20px;
  z-index: 210;
  width: 290px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.12), 0 3px 10px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-sizing: border-box;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

html.dark .chart-style-popover {
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.35), 0 3px 10px rgba(0, 0, 0, 0.2);
}

.chart-style-popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 8px;
  margin-bottom: 2px;
}

.chart-style-title {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.chart-style-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  color: var(--color-outline);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.chart-style-close:hover {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
}

.chart-style-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.style-control-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.style-control-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.style-control-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.style-control-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-outline);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.style-text-input {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 6px 10px;
  font-size: 12px;
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  outline: none;
  font-family: var(--font-main);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  box-sizing: border-box;
}

.style-text-input:focus {
  border-color: var(--color-outline);
}

.style-select-control {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 6px 20px 6px 10px;
  font-size: 12px;
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  font-family: var(--font-main);
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-repeat: no-repeat;
  background-position: right 6px center;
  box-sizing: border-box;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%236B6B6B' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

html.dark .style-select-control {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%239A9895' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

.style-select-control:focus {
  border-color: var(--color-outline);
}

/* Color Presets */
.style-color-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.style-color-preset {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  box-sizing: border-box;
}

.style-color-preset:hover {
  transform: scale(1.12);
}

.style-color-preset.active {
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-primary);
}

.style-color-custom-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

/* Mobile Adjustment for Popover */
@media (max-width: 768px) {
  .chart-style-popover {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    right: auto;
    width: 90%;
    max-width: 320px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    z-index: 210;
  }

  html.dark .chart-style-popover {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  }
}

/* ═══════════════════════════════════════════
   RESPONSIVE LAYOUT & SIDEBAR TOGGLE BUTTONS
   ═══════════════════════════════════════════ */
.sidebar-toggle-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  border-radius: 50%;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  outline: none;
  padding: 0;
}

.sidebar-toggle-btn:hover {
  background-color: var(--color-surface-low);
}

.sidebar-toggle-btn:active {
  transform: scale(0.92);
}

.sidebar-drawer-overlay {
  display: none;
}

/* 768px Tablet & Mobile Layout Shifts */
@media (max-width: 768px) {
  .sidebar-toggle-btn {
    display: inline-flex;
  }

  .app-body {
    display: block !important;
    /* Converts app grid to block layout to prevent vertical stacking */
  }

  .app-content-area {
    width: 100% !important;
    height: 100% !important;
  }

  .app-sidebar-nav {
    position: fixed !important;
    top: 0 !important;
    left: -240px !important;
    /* Start offscreen */
    width: 240px !important;
    height: 100vh !important;
    height: 100dvh !important;
    z-index: 99 !important;
    box-shadow: none !important;
    border-right: 1px solid var(--color-border) !important;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
  }

  /* Slide-in Drawer Active State */
  .app-sidebar-nav.active {
    transform: translateX(240px) !important;
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.1) !important;
  }

  html.dark .app-sidebar-nav.active {
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.3) !important;
  }

  /* Backdrop Overlay styling */
  .sidebar-drawer-overlay {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100vw;
    height: calc(100vh - 60px);
    height: calc(100dvh - 60px);
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 95;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .sidebar-drawer-overlay.active {
    opacity: 1;
    pointer-events: auto;
  }

  /* Touch-friendly Legend Color Popover on Mobile */
  .legend-color-popover {
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    right: auto !important;
    bottom: auto !important;
    width: 90% !important;
    max-width: 240px !important;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2) !important;
    z-index: 210 !important;
  }

  html.dark .legend-color-popover {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5) !important;
  }

  /* Ingestion Header vertically aligned on Mobile */
  .upload-header {
    align-items: flex-start;
    gap: 12px;
  }

  /* Compact spacing for stacked cards on Mobile */
  #workspace-view-panel,
  #workspace-history-panel {
    gap: 16px !important;
  }

  /* Proportional compact paste area on Mobile */
  .paste-area {
    height: 220px !important;
  }
}

/* 640px Mobile Phone Custom Wraps */
@media (max-width: 640px) {

  /* Dynamic Title & Legend Wrapping in ECharts Header */
  .chart-canvas-title-bar {
    flex-direction: column !important;
    align-items: center !important;
    gap: 12px !important;
    text-align: center !important;
    padding: 12px 14px !important;
  }

  .chart-canvas-title-center {
    order: 1 !important;
    width: 100% !important;
  }

  .chart-canvas-legend-left {
    order: 2 !important;
    flex-direction: row !important;
    flex-wrap: wrap !important;
    justify-content: center !important;
    align-items: center !important;
    gap: 12px !important;
    width: 100% !important;
    margin-bottom: 4px !important;
  }

  .chart-canvas-header-right-spacer {
    display: none !important;
  }

  /* Options toolbar dynamic wraps on Mobile */
  .chart-canvas-toolbar {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 8px !important;
    justify-content: center !important;
    align-items: center !important;
    padding: 8px 12px !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  .toolbar-toggle-pill {
    padding: 5px 10px !important;
    font-size: 11px !important;
  }

  /* Toolbar buttons grouping flow wrap */
  .edit-data-bar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 12px !important;
    padding: 12px 16px 20px !important;
  }

  .edit-data-bar-right {
    display: flex !important;
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 8px !important;
    width: 100% !important;
  }

  .edit-data-bar-right button {
    width: 100% !important;
    flex: none !important;
    justify-content: center !important;
    padding: 10px 16px !important;
    font-size: 12px !important;
  }

  #generate-btn {
    width: 100% !important;
    flex: none !important;
  }

  /* Active sample indicator components vertical stacking */
  #active-sample-indicator {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 8px !important;
    width: 100% !important;
  }

  #active-sample-name {
    display: flex !important;
    justify-content: center !important;
    text-align: center !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  #clear-sample-btn {
    display: inline-flex !important;
    width: 100% !important;
    justify-content: center !important;
    box-sizing: border-box !important;
  }
}

/* ═══════════════════════════════════════════
   CUSTOM CLEAR ALL CONFIRMATION MODAL & IMPORT
   ═══════════════════════════════════════════ */
.confirm-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(5px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.confirm-modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.confirm-modal-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  /* Beautifully curved card */
  width: 90%;
  max-width: 400px;
  padding: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateY(20px);
  transition: transform var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal);
}

.confirm-modal-overlay.open .confirm-modal-card {
  transform: translateY(0);
}

.confirm-modal-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.confirm-modal-icon {
  color: var(--color-red, #ef4444);
  font-size: 24px !important;
}

.confirm-modal-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

.confirm-modal-body p {
  font-family: var(--font-main);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-secondary-text);
  margin: 0;
}

.confirm-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 8px;
}

/* Pill shaped modal buttons */
.confirm-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 9999px;
  /* Pill shaped buttons */
  cursor: pointer;
  font-family: var(--font-main);
  transition: all var(--transition-fast);
  border: none;
}

.confirm-btn-cancel {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.confirm-btn-cancel:hover {
  background-color: var(--color-surface-variant);
}

.confirm-btn-danger {
  background-color: var(--color-red, #ef4444);
  color: #ffffff;
}

.confirm-btn-danger:hover {
  background-color: #dc2626;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2);
}

/* Premium Bordered Pill-Shaped Import Button */
.history-import-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px !important;
  background-color: var(--color-surface) !important;
  color: var(--color-primary) !important;
  font-size: 12px !important;
  font-weight: 600 !important;
  border: 1px solid var(--color-border) !important;
  border-radius: 9999px !important;
  /* Pill shaped */
  cursor: pointer !important;
  font-family: var(--font-main) !important;
  transition: all var(--transition-fast) !important;
}

.history-import-link:hover {
  background-color: var(--color-surface-variant) !important;
  border-color: var(--color-outline) !important;
}

.import-arrow {
  font-weight: 700 !important;
  font-size: 13px !important;
  transition: transform var(--transition-fast) !important;
  display: inline-block !important;
}

.history-import-link:hover .import-arrow {
  transform: translateX(3px) !important;
}

/* ═══════════════════════════════════════════
   HISTORY LIST RESPONSIVE STACKS
   ═══════════════════════════════════════════ */
@media (max-width: 640px) {
  .history-archive-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 20px;
  }

  .history-clear-all-btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 992px) {
  .history-list-wrapper {
    border: none;
    border-radius: 0;
    background: transparent;
  }

  .history-list-table,
  .history-list-table thead,
  .history-list-table tbody,
  .history-list-table tr,
  .history-list-table td {
    display: block;
    width: 100%;
    box-sizing: border-box;
  }

  .history-list-table thead {
    display: none;
  }

  .history-list-row {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 18px;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--shadow-sm);
    position: relative;
    /* relative positioning for absolute child align */
  }

  .history-list-row:last-child {
    margin-bottom: 0;
  }

  .history-list-row td {
    padding: 0 !important;
    border: none !important;
  }

  .history-list-row td.col-file {
    font-size: 14px;
    padding-right: 110px !important;
    /* prevent overflow overlap with badge */
  }

  .history-filename-monospace {
    white-space: normal;
    word-break: break-all;
    max-width: 100%;
    display: inline-block;
  }

  .history-list-row td.col-type {
    position: absolute;
    /* absolute position for right align inline with filename */
    top: 18px;
    right: 18px;
    width: auto;
    display: inline-flex;
    align-items: center;
  }

  .history-list-row td.col-size::before {
    content: "Dimensions: ";
    font-size: 11px;
    font-weight: 600;
    color: var(--color-outline);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .history-list-row td.col-when::before {
    content: "Created: ";
    font-size: 11px;
    font-weight: 600;
    color: var(--color-outline);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .history-list-row td.col-actions {
    margin-top: 8px;
    border-top: 1px dashed var(--color-border) !important;
    padding-top: 14px !important;
    width: 100%;
  }

  .action-buttons-cell-mockup {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: 8px;
  }

  .history-import-link {
    flex: 1;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .history-empty-container-mockup {
    padding: 48px 16px;
  }

  .history-empty-desc-mockup {
    font-size: 12px;
  }
}

/* --- Sidebar Dropdown Menu (Chart Types) --- */
.sidebar-dropdown-content {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  margin-top: 4px;
  margin-bottom: 8px;
}

.sidebar-dropdown-content.open {
  display: flex;
}

.sidebar-dropdown-content .sidebar-menu-item {
  padding: 8px 12px;
  font-size: 12.5px;
}