:root {
  --cds-background: #161616;
  --cds-layer-01: #262626;
  --cds-layer-02: #393939;
  --cds-layer-active-01: #474747;
  --cds-text-primary: #f4f4f4;
  --cds-text-secondary: #c6c6c6;
  --cds-text-helper: #8d8d8d;
  --cds-interactive: #0f62fe;
  --cds-interactive-hover: #0353e9;
  --cds-button-secondary: #393939;
  --cds-button-secondary-hover: #4c4c4c;
  --cds-button-danger: #da1e28;
  --cds-button-danger-hover: #ba1b23;
  --cds-support-success: #24a148;
  --cds-focus: #ffffff;
  --cds-border-subtle: #393939;
  --cds-border-strong: #8d8d8d;
  
  --cds-spacing-02: 0.25rem;
  --cds-spacing-03: 0.5rem;
  --cds-spacing-04: 0.75rem;
  --cds-spacing-05: 1rem;
  --cds-spacing-06: 1.5rem;
  --cds-spacing-07: 2rem;

  --header-height: 3.5rem;
  --footer-height: 2rem;
}

/* Base Reset & Typography */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--cds-background);
  color: var(--cds-text-primary);
  height: 100vh;
  display: grid;
  grid-template-areas:
    "header"
    "main"
    "footer";
  grid-template-rows: var(--header-height) 1fr var(--footer-height);
  grid-template-columns: 1fr;
  overflow: hidden;
}

:focus-visible {
  outline: 2px solid var(--cds-focus);
  outline-offset: -2px;
}

/* Utilities */
.mt-05 { margin-top: var(--cds-spacing-05); }
.mt-auto { margin-top: auto; }
.pt-07 { padding-top: var(--cds-spacing-07); }
.full-width { width: 100%; }

/* Header & Dropdown Elements */
.cds-header {
  grid-area: header;
  background-color: var(--cds-background);
  border-bottom: 1px solid var(--cds-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--cds-spacing-05);
  height: var(--header-height);
  z-index: 100;
}

.header-brand {
  font-weight: 600;
  letter-spacing: 0.1px;
}

.header-actions {
  display: flex;
  gap: var(--cds-spacing-03);
  align-items: center;
}

.dropdown-container {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--cds-spacing-02));
  right: 0;
  background-color: var(--cds-layer-01);
  border: 1px solid var(--cds-border-subtle);
  box-shadow: 0 4px 8px rgba(0,0,0,0.5);
  min-width: 220px;
  list-style: none;
  z-index: 200;
}

.dropdown-menu[hidden] {
  display: none;
}

.dropdown-group-title {
  font-size: 0.75rem;
  color: var(--cds-text-secondary);
  padding: var(--cds-spacing-04) var(--cds-spacing-05) var(--cds-spacing-02);
  text-transform: uppercase;
}

.dropdown-link {
  display: block;
  padding: var(--cds-spacing-03) var(--cds-spacing-05);
  color: var(--cds-text-primary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: background-color 0.15s ease;
}

.dropdown-link:hover,
.dropdown-link[aria-current="page"] {
  background-color: var(--cds-layer-02);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--cds-border-subtle);
  margin: var(--cds-spacing-03) 0;
}

/* Main Workspace */
.cds-main {
  grid-area: main;
  display: flex;
  flex-direction: row;
  overflow: hidden;
}

.panel-input,
.panel-output {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  padding: var(--cds-spacing-05);
  background-color: var(--cds-background);
}

.panel-input {
  flex: 1 1 auto; /* Fill space by default */
  min-width: 300px;
}

.panel-output {
  flex: 0 0 40%;
  min-width: 300px;
  background-color: var(--cds-layer-01); /* Visual differentiation as a submenu */
}

.panel-output[hidden] {
  display: none;
}

/* Resizer */
.splitter {
  width: 4px;
  background-color: var(--cds-border-subtle);
  cursor: col-resize;
  transition: background-color 0.15s ease;
  z-index: 10;
}

.splitter:hover,
.splitter.is-dragging {
  background-color: var(--cds-interactive);
}
.splitter[hidden] {
  display: none;
}

/* Forms, Inputs, Buttons */
.cds-form-item { margin-bottom: var(--cds-spacing-05); }

.cds-label {
  display: block;
  font-size: 0.75rem;
  color: var(--cds-text-secondary);
  margin-bottom: var(--cds-spacing-02);
}

.cds-text-input {
  width: 100%;
  background-color: var(--cds-layer-01);
  border: none;
  border-bottom: 1px solid var(--cds-border-strong);
  color: var(--cds-text-primary);
  padding: var(--cds-spacing-03) var(--cds-spacing-04);
  font-family: inherit;
  font-size: 0.875rem;
  transition: background-color 0.15s ease;
}

.cds-text-input:focus {
  outline: 2px solid var(--cds-focus);
  outline-offset: -2px;
  background-color: var(--cds-layer-02);
}

.cds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--cds-spacing-03) var(--cds-spacing-05);
  font-family: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  border: none;
  transition: background-color 0.15s ease;
}

.cds-btn--primary {
  background-color: var(--cds-interactive);
  color: #fff;
}
.cds-btn--primary:hover { background-color: var(--cds-interactive-hover); }
.cds-btn--primary:disabled { background-color: var(--cds-layer-02); color: var(--cds-text-helper); cursor: not-allowed; }

.cds-btn--secondary {
  background-color: var(--cds-button-secondary);
  color: #fff;
}
.cds-btn--secondary:hover { background-color: var(--cds-button-secondary-hover); }
.cds-btn--secondary[aria-expanded="true"] { background-color: var(--cds-layer-active-01); border-bottom: 2px solid var(--cds-interactive); }

.cds-btn--danger {
  background-color: transparent;
  color: var(--cds-button-danger);
  padding: var(--cds-spacing-02) var(--cds-spacing-03);
}
.cds-btn--danger:hover {
  background-color: var(--cds-button-danger);
  color: #fff;
}
.btn-add { align-self: flex-start; }

/* File Drag Zone */
.file-drop-zone {
  border: 1px dashed var(--cds-border-strong);
  padding: var(--cds-spacing-06);
  text-align: center;
  background-color: var(--cds-layer-01);
  margin-bottom: var(--cds-spacing-05);
  transition: all 0.15s ease;
}
.file-drop-text { color: var(--cds-text-secondary); font-size: 0.875rem; }
.file-drop-zone.drag-active {
  background-color: var(--cds-layer-02);
  border-color: var(--cds-interactive);
}

/* Data Table */
.cds-data-table-container {
  overflow-x: auto;
  margin-bottom: var(--cds-spacing-05);
}
.cds-data-table {
  width: 100%;
  border-collapse: collapse;
}
.cds-data-table th,
.cds-data-table td {
  padding: var(--cds-spacing-03) var(--cds-spacing-04);
  text-align: left;
  border-bottom: 1px solid var(--cds-border-subtle);
  font-size: 0.875rem;
}
.cds-data-table th {
  background-color: var(--cds-layer-01);
  color: var(--cds-text-secondary);
  font-weight: 600;
}
.cds-data-table td .table-input {
  width: 100px;
  background-color: transparent;
  border: none;
  border-bottom: 1px solid transparent;
  color: var(--cds-text-primary);
  font-family: inherit;
  font-size: 0.875rem;
}
.cds-data-table td .table-input:focus {
  border-bottom: 1px solid var(--cds-interactive);
  outline: none;
  background-color: var(--cds-layer-02);
}

/* Console Output */
.telemetry-console-wrapper {
  display: flex;
  flex-direction: column;
  flex: 1; /* Stretch to fill available vertical space */
}
.console-output {
  flex: 1;
  background-color: var(--cds-background);
  border: 1px solid var(--cds-border-subtle);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  padding: var(--cds-spacing-04);
  overflow-y: auto;
  white-space: pre-wrap;
  margin-bottom: var(--cds-spacing-05);
}

/* Footer */
.cds-footer {
  grid-area: footer;
  background-color: var(--cds-layer-01);
  border-top: 1px solid var(--cds-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--cds-spacing-05);
  font-size: 0.75rem;
  color: var(--cds-text-secondary);
}
.status-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--cds-support-success);
  margin-right: var(--cds-spacing-02);
}
h2 {
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: var(--cds-spacing-05);
}

/* --------------------------------------
   Mobile Adaptations (Responsive Breakpoint)
   -------------------------------------- */
@media (max-width: 768px) {
  .cds-main {
    flex-direction: column;
  }
  
  .splitter {
    display: none !important; /* Disable dragging on touch/mobile viewports */
  }

  .panel-input,
  .panel-output {
    flex: 1 1 auto !important;
    width: 100% !important;
    min-height: 50vh;
  }

  .panel-output {
    border-top: 1px solid var(--cds-border-subtle);
  }

  /* Wrap header actions on extreme small sizes */
  .header-actions {
    gap: var(--cds-spacing-02);
  }
  .cds-btn {
    padding: var(--cds-spacing-02) var(--cds-spacing-03);
    font-size: 0.75rem;
  }
}