:root {
  --bg: #f8f9fa;
  --surface: #ffffff;
  --border: #dee2e6;
  --text: #212529;
  --text-muted: #6c757d;
  --accent: #0d6efd;
  --accent-hover: #0b5ed7;
  --error-bg: #fff5f5;
  --error-border: #fc8181;
  --error-text: #c53030;
  --badge-bg: #e9ecef;
  --tab-active-bg: #0d6efd;
  --tab-active-text: #fff;
  --icon-bg: #f1f3f5;
  --icon-fg: #212529;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a2e;
    --surface: #16213e;
    --border: #0f3460;
    --text: #e0e0e0;
    --text-muted: #9e9e9e;
    --accent: #4d8bf5;
    --accent-hover: #6aa0f8;
    --error-bg: #2d1b1b;
    --error-border: #9b2c2c;
    --error-text: #fc8181;
    --badge-bg: #0f3460;
    --tab-active-bg: #4d8bf5;
    --icon-bg: #0f2944;
    --icon-fg: #e0e0e0;
  }
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1rem;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition:
    border-color 0.2s,
    background 0.2s;
  background: var(--surface);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, var(--surface));
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.drop-icon {
  width: 48px;
  height: 48px;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.drop-hint {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Loading */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 3rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Error */
.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  color: var(--error-text);
  margin-top: 1rem;
}

/* Results */
.results {
  margin-top: 1.5rem;
}

.file-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.file-header-copy {
  flex: 1 1 320px;
}

.file-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 0.35rem;
}

.file-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.file-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.badge {
  display: inline-block;
  padding: 0.15em 0.65em;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--text-muted);
}

.subtle-text {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.btn-clear {
  padding: 0.35rem 0.9rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s;
}

.btn-clear:hover {
  background: var(--border);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.tab {
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition:
    color 0.15s,
    border-color 0.15s;
}

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

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

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
}

/* Info tab -- hero */
.info-hero-card {
  padding: 1.5rem;
}

.info-hero {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.info-hero-icon {
  flex: 0 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.info-icon-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.info-icon-img {
  display: block;
  border-radius: 6px;
  background: var(--icon-bg);
  /* Render the 32x32 source as crisp pixel art when scaled up. */
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

.info-icon-variant {
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 0.05em 0.5em;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--text-muted);
}

.info-icon-placeholder {
  width: 128px;
  height: 128px;
  border-radius: 6px;
  background: var(--icon-bg);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.info-hero-meta {
  flex: 1 1 240px;
  min-width: 0;
}

.info-hero-title {
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.2rem;
  overflow-wrap: anywhere;
}

.info-hero-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-family: var(--mono);
  margin-bottom: 1rem;
  overflow-wrap: anywhere;
}

.info-hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem 1rem;
  margin: 0;
}

.info-fact dt {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.1rem;
}

.info-fact dd {
  font-family: var(--mono);
  font-size: 0.9rem;
}

/* Info tab -- flag chips */
.info-flag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.85rem;
}

.info-flag-chip {
  display: inline-block;
  padding: 0.15em 0.6em;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--badge-bg);
  color: var(--text-muted);
  text-transform: lowercase;
}

.info-flag-chip-warn {
  color: #b8530a;
  border-color: #f3b878;
  background: #fff4e6;
}

.info-flag-chip-info {
  color: #1c7ed6;
  border-color: #74c0fc;
  background: #e7f5ff;
}

.info-flag-chip-debug {
  color: #6741d9;
  border-color: #b197fc;
  background: #f3f0ff;
}

@media (prefers-color-scheme: dark) {
  .info-flag-chip-warn {
    color: #ffd8a8;
    border-color: #5c3a16;
    background: #2c1d0e;
  }
  .info-flag-chip-info {
    color: #74c0fc;
    border-color: #1c3d5a;
    background: #0f2944;
  }
  .info-flag-chip-debug {
    color: #b197fc;
    border-color: #2a1f4a;
    background: #18112e;
  }
}

/* Info tab -- description */
.info-description {
  font-size: 0.95rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* Info tab -- dependencies */
.info-deps {
  display: grid;
  gap: 1rem;
}

.info-dep-group h4 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.info-dep-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--badge-bg);
  padding: 0.05em 0.5em;
  border-radius: 999px;
  font-weight: 500;
}

.info-dep-list {
  list-style: none;
  display: grid;
  gap: 0.3rem;
  padding: 0;
}

.info-dep-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
}

.info-dep-row-main {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
}

.info-dep-path {
  font-size: 0.75rem;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}

.info-dep-path code {
  font-family: var(--mono);
  background: var(--badge-bg);
  padding: 0.05rem 0.4rem;
  border-radius: 3px;
}

/* Connector pane */
.info-connector {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.info-connector-svg {
  background: var(--icon-bg);
  border-radius: 6px;
  display: block;
}

.info-connector-svg .info-connector-bg {
  fill: var(--icon-bg);
}

.info-connector-svg .info-connector-cells rect {
  fill: var(--accent);
  opacity: 0.8;
}

.info-connector-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.info-connector-line {
  font-weight: 600;
}

.info-connector-meta code {
  font-family: var(--mono);
  background: var(--badge-bg);
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
}

/* Types card */
.info-types {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.info-type-list {
  list-style: none;
  display: grid;
  gap: 0.3rem;
  padding: 0;
  margin: 0.25rem 0;
}

.info-type-row {
  display: grid;
  grid-template-columns: 3.5rem 6rem 1fr;
  gap: 0.5rem;
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  font-size: 0.85rem;
  align-items: baseline;
}

.info-type-index {
  font-family: var(--mono);
  color: var(--text-muted);
  font-size: 0.75rem;
}

.info-type-kind {
  font-weight: 600;
  font-size: 0.8rem;
}

.info-type-label {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text);
  overflow-wrap: anywhere;
}

.info-type-hist-label {
  margin-top: 0.5rem;
}

.info-type-hist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.info-type-pill {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.info-type-pill-count {
  color: var(--text-muted);
  font-size: 0.7rem;
}

.info-dep-qualifier {
  font-family: var(--mono);
  font-size: 0.85rem;
  overflow-wrap: anywhere;
  min-width: 0;
}

.info-dep-kind {
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--badge-bg);
  border-radius: 4px;
  padding: 0.05em 0.5em;
  flex: 0 0 auto;
}

.info-dep-meta {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-mono, monospace);
  flex: 0 0 auto;
  opacity: 0.85;
}

/* Structure tab -- container layout */
.schema-diagram {
  margin-top: 0.25rem;
}

.schema-blueprint {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.schema-region {
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: 8px;
  padding: 0.9rem 1rem;
  background: color-mix(in srgb, var(--badge-bg) 35%, var(--surface));
}

.schema-region-primary {
  border-left-color: var(--accent);
}

.schema-region-data {
  border-left-color: #2f9e44;
}

.schema-region-meta {
  border-left-color: #9775fa;
}

.schema-region-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.schema-region-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.schema-region-range {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-family: var(--mono);
}

.schema-region-range code {
  font-family: inherit;
}

.schema-region-desc {
  margin-bottom: 0.55rem;
}

.schema-arrow {
  align-self: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-family: var(--mono);
  padding: 0.15rem 0;
}

.schema-arrow code {
  font-family: inherit;
  background: var(--badge-bg);
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
}

.schema-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.validation-pill {
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--badge-bg);
  font-size: 0.82rem;
}

.schema-subregion-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.5rem;
  padding-left: 0.75rem;
  border-left: 2px dashed var(--border);
}

.schema-subregion {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  align-items: baseline;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
}

.schema-subregion strong {
  font-size: 0.9rem;
}

/* Info table (schema header fields) */
.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.info-table tr:not(:last-child) td {
  border-bottom: 1px solid var(--border);
}

.info-table td {
  padding: 0.4rem 0;
}

.info-table td:first-child {
  color: var(--text-muted);
  width: 40%;
  padding-right: 1rem;
}

.info-table td:last-child {
  font-family: var(--mono);
  font-size: 0.85rem;
}

.schema-header-fields td:last-child {
  color: var(--text);
}

/* Resources table (Structure tab) */
.resource-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.resource-table thead tr {
  background: var(--badge-bg);
}

.resource-table th,
.resource-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.resource-table th {
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.resource-table tbody tr:hover {
  background: color-mix(in srgb, var(--accent) 4%, var(--surface));
}

.resource-table .resource-role {
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.resource-size {
  font-family: var(--mono);
  font-size: 0.85rem;
  white-space: nowrap;
}

.resource-row-opaque td {
  color: var(--text-muted);
}

.resource-row-opaque .type-tag,
.resource-row-opaque .resource-size {
  color: var(--text);
}

.resource-decoded-badge {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.05em 0.5em;
  border-radius: 999px;
  background: color-mix(in srgb, #2f9e44 15%, transparent);
  color: #2b8a3e;
  border: 1px solid color-mix(in srgb, #2f9e44 40%, transparent);
}

@media (prefers-color-scheme: dark) {
  .resource-decoded-badge {
    color: #8ce99a;
    background: color-mix(in srgb, #2f9e44 20%, transparent);
    border-color: color-mix(in srgb, #2f9e44 45%, transparent);
  }
}

.type-tag {
  display: inline-block;
  padding: 0.1em 0.45em;
  border-radius: 3px;
  background: var(--badge-bg);
  font-size: 0.8rem;
  font-family: var(--mono);
}

/* Heap tree (Front Panel + Block Diagram tabs) */
.heap-fidelity-card {
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}

.heap-mode-switch {
  display: inline-flex;
  gap: 0.45rem;
  margin-top: 1rem;
  padding: 0.3rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 85%, var(--accent) 15%);
  border: 1px solid color-mix(in srgb, var(--border) 78%, var(--accent) 22%);
}

.heap-mode-btn {
  border: 0;
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.heap-mode-btn.active {
  background: var(--accent);
  color: var(--surface);
}

.heap-warning-list ul {
  margin: 0;
  padding-left: 1.2rem;
}

.heap-warning-list li {
  color: var(--text);
  margin: 0.35rem 0;
}

.heap-canvas-note {
  margin-bottom: 0.75rem;
}

.scene-preview {
  overflow-x: auto;
}

.scene-preview svg {
  display: block;
  width: 100%;
  height: auto;
  min-width: 320px;
  background:
    radial-gradient(circle at top left, rgba(244, 240, 232, 0.9), rgba(235, 228, 214, 0.85)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.75), rgba(244, 240, 232, 0.75));
  border: 1px solid rgba(95, 75, 50, 0.18);
  border-radius: 14px;
  padding: 10px;
  box-sizing: border-box;
}

.scene-preview-canvas {
  padding: 0;
}

.heap-canvas {
  display: block;
  max-width: 100%;
  background:
    radial-gradient(circle at top left, rgba(244, 240, 232, 0.9), rgba(235, 228, 214, 0.85)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.75), rgba(244, 240, 232, 0.75));
  border: 1px solid rgba(95, 75, 50, 0.18);
  border-radius: 14px;
}

.heap-hist-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.heap-hist-pill,
.heap-hist-pill-fallback {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.85rem;
  border: 1px solid var(--border);
  background: var(--badge-bg);
}

.heap-hist-pill-fallback {
  opacity: 0.55;
  font-style: italic;
}

.heap-hist-count {
  display: inline-block;
  min-width: 1.5em;
  text-align: center;
  background: color-mix(in srgb, var(--accent) 18%, var(--surface));
  color: var(--accent);
  border-radius: 999px;
  padding: 0 0.35em;
  font-size: 0.75rem;
}

.heap-tree {
  font-family: var(--mono);
  font-size: 0.85rem;
}

.heap-node {
  margin: 0.15rem 0;
  padding: 0.2rem 0.4rem;
  border-left: 2px solid var(--border);
}

.heap-node[open] {
  border-left-color: var(--accent);
}

.heap-node-summary,
.heap-node-leaf {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  list-style: none;
}

details.heap-node > summary.heap-node-summary {
  cursor: pointer;
}

details.heap-node > summary.heap-node-summary::-webkit-details-marker {
  display: none;
}

details.heap-node > summary.heap-node-summary::before {
  content: "▶";
  font-size: 0.6em;
  color: var(--text-muted);
  width: 0.8em;
  display: inline-block;
}

details.heap-node[open] > summary.heap-node-summary::before {
  content: "▼";
}

.heap-node-leaf::before {
  content: "•";
  color: var(--text-muted);
  width: 0.8em;
  display: inline-block;
}

.heap-node-children {
  margin-left: 1.25rem;
}

.heap-node-tag {
  font-weight: 600;
  color: var(--accent);
}

.heap-node-tag-fallback {
  color: var(--text-muted);
  font-style: italic;
}

.heap-node-count,
.heap-node-leafcount,
.heap-node-size {
  font-size: 0.75rem;
  padding: 0.05em 0.4em;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--text-muted);
}

.heap-node-leafcount {
  color: color-mix(in srgb, var(--accent) 80%, var(--text-muted));
}

/* Utility */
.hidden {
  display: none !important;
}

@media (max-width: 720px) {
  .container {
    padding: 1.25rem 0.75rem 2rem;
  }

  .drop-zone {
    padding: 2rem 1rem;
  }

  .resource-table {
    display: block;
    overflow-x: auto;
  }

  .file-header h2 {
    white-space: normal;
  }

  .info-hero {
    gap: 1rem;
  }
}

footer {
  text-align: center;
  margin-top: 3rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}