:root {
  /* Light mode raw tokens (Warm Technical Drafting Paper & Carbon Ink) */
  --bg-light: #f6f5f0;
  --surface-light: #ffffff;
  --surface-well-light: #efece6;
  --border-light: #d6d2c8;
  --border-strong-light: #111315;
  --ink-light: #111315;
  --ink-muted-light: #525860;
  --accent-light: #c84b31;
  --accent-contrast-light: #ffffff;
  --positive-light: #1b7f5c;
  --warning-light: #b45309;
  --danger-light: #b91c1c;

  /* Dark mode raw tokens (Carbon Matte & High-Contrast Technical Ink) */
  --bg-dark: #0c0d0e;
  --surface-dark: #141619;
  --surface-well-dark: #1b1e23;
  --border-dark: #2c3038;
  --border-strong-dark: #8e96a4;
  --ink-dark: #eceae3;
  --ink-muted-dark: #949ba6;
  --accent-dark: #e05a3f;
  --accent-contrast-dark: #0c0d0e;
  --positive-dark: #2a9d8f;
  --warning-dark: #f59e0b;
  --danger-dark: #ef4444;

  /* Typography & geometry */
  --font-sans: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius-sm: 2px;
  --radius-md: 4px;

  /* Default semantic mapping (Light) */
  color-scheme: light dark;
  --bg: var(--bg-light);
  --surface: var(--surface-light);
  --surface-well: var(--surface-well-light);
  --border: var(--border-light);
  --border-strong: var(--border-strong-light);
  --ink: var(--ink-light);
  --ink-muted: var(--ink-muted-light);
  --accent: var(--accent-light);
  --accent-contrast: var(--accent-contrast-light);
  --positive: var(--positive-light);
  --warning: var(--warning-light);
  --danger: var(--danger-light);

  accent-color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not(:has(> head > meta[name="color-scheme"][content="light"])) {
    --bg: var(--bg-dark);
    --surface: var(--surface-dark);
    --surface-well: var(--surface-well-dark);
    --border: var(--border-dark);
    --border-strong: var(--border-strong-dark);
    --ink: var(--ink-dark);
    --ink-muted: var(--ink-muted-dark);
    --accent: var(--accent-dark);
    --accent-contrast: var(--accent-contrast-dark);
    --positive: var(--positive-dark);
    --warning: var(--warning-dark);
    --danger: var(--danger-dark);
  }
}

:root[data-theme="dark"],
:root:has(> head > meta[name="color-scheme"][content="dark"]) {
  color-scheme: dark;
  --bg: var(--bg-dark);
  --surface: var(--surface-dark);
  --surface-well: var(--surface-well-dark);
  --border: var(--border-dark);
  --border-strong: var(--border-strong-dark);
  --ink: var(--ink-dark);
  --ink-muted: var(--ink-muted-dark);
  --accent: var(--accent-dark);
  --accent-contrast: var(--accent-contrast-dark);
  --positive: var(--positive-dark);
  --warning: var(--warning-dark);
  --danger: var(--danger-dark);
}

:root[data-theme="light"],
:root:has(> head > meta[name="color-scheme"][content="light"]) {
  color-scheme: light;
  --bg: var(--bg-light);
  --surface: var(--surface-light);
  --surface-well: var(--surface-well-light);
  --border: var(--border-light);
  --border-strong: var(--border-strong-light);
  --ink: var(--ink-light);
  --ink-muted: var(--ink-muted-light);
  --accent: var(--accent-light);
  --accent-contrast: var(--accent-contrast-light);
  --positive: var(--positive-light);
  --warning: var(--warning-light);
  --danger: var(--danger-light);
}

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

body {
  font-family: var(--font-sans);
  font-size-adjust: from-font;
  background-color: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--ink);
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
  transition: color 0.12s ease, text-decoration-color 0.12s ease;
}

a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.wrap {
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 24px;
}

/* Top technical instrument bar */
header.site-header {
  background-color: var(--surface);
  border-block-end: 1px solid var(--border);
  position: sticky;
  inset-block-start: 0;
  z-index: 40;
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  gap: 12px;
  flex-wrap: nowrap;
}

@media (max-width: 980px) {
  .header-bar {
    flex-wrap: wrap;
    padding-block: 8px;
  }
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-mark:hover {
  color: var(--ink);
}

.brand-version {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--ink-muted);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
  overflow-x: auto;
}

.nav-links a {
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-muted);
  padding: 5px 7px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--ink);
  background-color: var(--surface-well);
}

.nav-links a.active {
  color: var(--ink);
  background-color: var(--surface-well);
  border-color: var(--border);
  font-weight: 600;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-muted);
  margin-block-end: 14px;
}

.breadcrumb-nav a {
  color: var(--ink-muted);
  text-decoration: none;
}

.breadcrumb-nav a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.sr-status {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
}

.sr-status.visible {
  opacity: 1;
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--positive);
}

/* Main layout & section rhythm */
main {
  padding-block: 28px 64px;
}

.page-masthead {
  border-block-end: 1px solid var(--border);
  padding-block-end: 20px;
  margin-block-end: 24px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
}

h1 {
  font-size: clamp(1.55rem, 2.5vw, 2.15rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  max-width: 68ch;
}

.masthead-lead {
  color: var(--ink-muted);
  font-size: 0.96rem;
  max-width: 74ch;
  margin-block-start: 6px;
}

.sync-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* App Frame / Instrument Workbench */
.app-frame {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-block-end: 32px;
}

.app-frame-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background-color: var(--surface-well);
  border-block-end: 1px solid var(--border);
  gap: 12px;
  flex-wrap: wrap;
}

.app-frame-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.workbench-split {
  display: grid;
  grid-template-columns: 470px 1fr;
  border-block-end: 1px solid var(--border);
}

@media (max-width: 960px) {
  .workbench-split {
    grid-template-columns: 1fr;
  }
}

.workbench-split > *,
.field-grid-2 > *,
.field-grid-3 > *,
.field-grid-4 > * {
  min-width: 0;
}

.workbench-controls {
  padding: 20px;
  border-inline-end: 1px solid var(--border);
  background-color: var(--surface);
  min-width: 0;
}

@media (max-width: 960px) {
  .workbench-controls {
    border-inline-end: none;
    border-block-end: 1px solid var(--border);
  }
}

.workbench-output {
  padding: 20px;
  background-color: var(--surface);
  min-width: 0;
}

.field-group {
  margin-block-end: 14px;
}

label.field-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-muted);
  margin-block-end: 5px;
}

.field-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-block-end: 12px;
}

.field-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-block-end: 12px;
}

@media (max-width: 720px) {
  .field-grid-2,
  .field-grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Drop zone for binary & text document files */
.drop-zone {
  display: block;
  position: relative;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background-color: var(--surface-well);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  margin-block-end: 14px;
  transition: border-color 0.12s ease, background-color 0.12s ease;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  background-color: var(--bg);
}

.drop-zone:focus-within {
  border-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  clip-path: inset(50%);
  overflow: hidden;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  white-space: nowrap;
}

.drop-zone-title {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--ink);
  margin-block-end: 4px;
}

.drop-zone-sub {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-muted);
}

/* Form controls */
input[type="text"],
input[type="password"],
input[type="number"],
input[type="search"],
select,
textarea {
  background-color: var(--bg);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  font-variant-numeric: tabular-nums;
}

textarea {
  field-sizing: content;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  height: auto;
  min-block-size: 5lh;
  max-block-size: 16lh;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  overflow-x: hidden;
}

textarea[readonly] {
  min-block-size: 14lh;
  max-block-size: 28lh;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible,
.table-wrapper:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

@supports not (accent-color: auto) {
  input[type="checkbox"]:checked {
    background-color: var(--accent);
    border-color: var(--accent);
  }
}

.checkbox-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-end: 12px;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.81rem;
  color: var(--ink);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: auto;
}

/* Buttons */
.btn-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

button.btn,
a.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background-color: var(--accent);
  color: var(--accent-contrast);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  min-height: 36px;
  transition: transform 0.08s ease, background-color 0.12s ease;
}

button.btn:hover,
a.btn:hover {
  transform: translateY(-1px);
  color: var(--accent-contrast);
}

button.btn:active,
a.btn:active {
  transform: translateY(0);
}

button.btn-quiet,
a.btn-quiet {
  background-color: var(--surface);
  color: var(--ink);
  border: 1px solid var(--border);
}

button.btn-quiet:hover,
a.btn-quiet:hover {
  background-color: var(--surface-well);
  color: var(--ink);
}

/* Preset pills */
.preset-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-block-end: 12px;
}

button.filter-pill {
  background-color: var(--bg);
  color: var(--ink-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
}

button.filter-pill:hover,
button.filter-pill.active {
  background-color: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

/* KPI Strip */
.kpi-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  margin-block-end: 16px;
}

@media (max-width: 720px) {
  .kpi-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

.kpi-cell {
  background-color: var(--surface-well);
  padding: 10px 14px;
  min-width: 0;
}

.kpi-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

.kpi-val {
  font-family: var(--font-mono);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  margin-block-start: 2px;
}

/* Responsive Data Tables */
.table-wrapper {
  container-type: inline-size;
  overflow-x: auto;
  border: 1px solid var(--border);
  background-color: var(--surface);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.81rem;
  font-variant-numeric: tabular-nums;
}

table.data-table caption {
  text-align: start;
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.84rem;
  color: var(--ink-muted);
  background-color: var(--surface-well);
  border-block-end: 1px solid var(--border);
}

table.data-table th,
table.data-table td {
  padding: 9px 12px;
  border-block-end: 1px solid var(--border);
  text-align: start;
  white-space: nowrap;
}

table.data-table thead th {
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  background-color: var(--surface-well);
  font-weight: 600;
}

table.data-table tbody tr:hover {
  background-color: var(--surface-well);
}

.tag-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 1px 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--ink-muted);
}

@container (width < 600px) {
  table.data-table,
  table.data-table thead,
  table.data-table tbody,
  table.data-table tr,
  table.data-table th,
  table.data-table td {
    display: block;
    white-space: normal;
  }
  table.data-table thead {
    display: none;
  }
  table.data-table tr {
    margin-block-end: 10px;
    border: 1px solid var(--border);
  }
}

/* Suite index grid */
.tool-index-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  margin-block-end: 32px;
}

@media (max-width: 900px) {
  .tool-index-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .tool-index-grid {
    grid-template-columns: 1fr;
  }
}

.tool-index-cell {
  background-color: var(--surface);
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  text-decoration: none;
  transition: background-color 0.12s ease;
}

.tool-index-cell:hover {
  background-color: var(--surface-well);
}

.tool-index-cell h3 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink);
  margin-block-end: 4px;
}

.tool-index-cell p {
  font-size: 0.84rem;
  color: var(--ink-muted);
  line-height: 1.45;
}

.tool-index-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
}

/* Documentation sections */
.doc-section {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 28px;
  margin-block-end: 24px;
}

.doc-section-deferred {
  content-visibility: auto;
  contain-intrinsic-size: auto 320px;
}

.doc-section h2 {
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-block-end: 12px;
  padding-block-end: 8px;
  border-block-end: 1px solid var(--border);
}

.doc-section h3 {
  font-size: 1.02rem;
  font-weight: 600;
  margin-block: 16px 8px;
}

.doc-section p,
.doc-section li {
  color: var(--ink);
  max-width: 76ch;
  margin-block-end: 10px;
  font-size: 0.95rem;
}

.doc-section ul,
.doc-section ol {
  padding-inline-start: 20px;
  margin-block-end: 14px;
}

code.inline {
  font-family: var(--font-mono);
  font-size: 0.84em;
  background-color: var(--surface-well);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: var(--radius-sm);
}

pre.code-block {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background-color: var(--surface-well);
  border: 1px solid var(--border);
  padding: 14px;
  overflow-x: auto;
  margin-block-end: 14px;
}

footer.site-footer {
  border-block-start: 1px solid var(--border);
  background-color: var(--surface);
  padding-block: 28px;
  font-size: 0.84rem;
  color: var(--ink-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}