:root {
  /* Warm Architectural Paper & Obsidian Workbench Palette (Cursor / Dieter Rams / Swiss Systems) */
  --canvas: #f7f6f2;
  --canvas-elevated: #efede7;
  --surface-paper: #ffffff;
  --ink: #161614;
  --ink-body: #3d3c37;
  --ink-muted: #5e5c55;

  /* Deep Obsidian Code & Circuit Workbench */
  --workbench-bg: #111214;
  --workbench-panel: #17181c;
  --workbench-border: #272930;
  --workbench-ink: #f1f3f5;
  --workbench-muted: #9ba1ab;

  /* Intentional Signal Accents (No neon glows) */
  --signal-orange: #c93702;
  --signal-orange-hover: #a82d00;
  --signal-green: #186b48;
  --signal-green-ink: #57d19c;
  --signal-amber-ink: #f0b449;
  --signal-crimson: #b8253a;

  /* Structural Hairlines */
  --rule: #dcdad2;
  --rule-strong: #b8b5aa;

  /* Typography */
  --font-sans: 'Archivo', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Emil Kowalski Custom Easing Curves */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
}

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

::selection {
  background-color: var(--ink);
  color: var(--canvas);
}

html {
  background-color: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
}

body {
  background-color: var(--canvas);
  color: var(--ink);
  line-height: 1.55;
  overflow-x: hidden;
}

p, li {
  text-wrap: pretty;
}

a, button, input, textarea {
  font-family: inherit;
}

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

.frame {
  width: min(1240px, calc(100% - 3rem));
  margin-inline: auto;
}

/* Top Architectural Navigation Bar */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(247, 246, 242, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.025em;
}

.wordmark-glyph {
  width: 24px;
  height: 24px;
  background-color: var(--signal-orange);
  color: #ffffff;
  display: inline-grid;
  place-items: center;
  border-radius: 4px;
}

.version-tag {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ink-muted);
  padding-left: 0.5rem;
  border-left: 1px solid var(--rule-strong);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-list a {
  color: var(--ink-body);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color 160ms var(--ease-out);
}

.nav-list a:hover {
  color: var(--ink);
}

.nav-cta-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: transform 160ms var(--ease-out), background-color 160ms var(--ease-out), border-color 160ms var(--ease-out);
}

.btn:active {
  transform: scale(0.97);
}

.btn-signal {
  background-color: var(--signal-orange);
  color: #ffffff;
}

.btn-signal:hover {
  background-color: var(--signal-orange-hover);
}

.btn-outline {
  background-color: var(--surface-paper);
  color: var(--ink);
  border-color: var(--rule-strong);
}

.btn-outline:hover {
  background-color: var(--canvas-elevated);
}

/* Hero Architectural Split */
.hero {
  padding: 4.5rem 0 4rem;
  border-bottom: 1px solid var(--rule);
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 3.5rem;
  align-items: start;
}

.hero-headline {
  font-size: clamp(2.35rem, 4.2vw, 3.75rem);
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.03em;
  color: var(--ink);
  text-wrap: balance;
  margin-bottom: 1.35rem;
}

.hero-lead {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--ink-body);
  max-width: 62ch;
  margin-bottom: 1.5rem;
}

.hero-lead strong {
  color: var(--ink);
  font-weight: 600;
}

/* Architectural Notice: Vision Elaboration Rule */
.vision-notice {
  background-color: var(--canvas-elevated);
  border-left: 1px solid var(--ink);
  border-top: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1.75rem;
  max-width: 62ch;
}

.vision-notice-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.3rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.vision-notice-copy {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--ink-body);
  max-width: 62ch;
}

/* 1-Command Global Terminal Strip */
.install-box {
  background-color: var(--workbench-bg);
  color: var(--workbench-ink);
  border-radius: 10px;
  border: 1px solid var(--workbench-border);
  overflow: hidden;
}

.install-box-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background-color: var(--workbench-panel);
  border-bottom: 1px solid var(--workbench-border);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.os-switch {
  display: inline-flex;
  gap: 0.35rem;
}

.os-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--workbench-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.3rem 0.65rem;
  border-radius: 4px;
  cursor: pointer;
  transition: color 150ms var(--ease-out), background-color 150ms var(--ease-out);
}

.os-btn.active {
  background-color: #262932;
  color: var(--workbench-ink);
  border-color: #3a3e4a;
}

.install-status-text {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--signal-green-ink);
}

.install-cmd-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.95rem 1rem;
}

.install-code {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--workbench-ink);
  overflow-x: auto;
  white-space: nowrap;
  min-width: 0;
  flex: 1;
}

.copy-trigger {
  background-color: var(--signal-orange);
  color: #ffffff;
  border: none;
  border-radius: 5px;
  padding: 0.45rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
  transition: transform 150ms var(--ease-out), background-color 150ms var(--ease-out);
}

.copy-trigger:hover {
  background-color: var(--signal-orange-hover);
}

.copy-trigger:active {
  transform: scale(0.97);
}

/* Right Hero: Interactive SVG Routing Blueprint Schematic */
.schematic-stage {
  background-color: var(--workbench-bg);
  color: var(--workbench-ink);
  border: 1px solid var(--workbench-border);
  border-radius: 12px;
  overflow: hidden;
}

.schematic-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.15rem;
  background-color: var(--workbench-panel);
  border-bottom: 1px solid var(--workbench-border);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--workbench-muted);
}

.schematic-body {
  padding: 1.25rem;
}

.topology-svg {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 1rem;
}

.layer-manifest {
  border-top: 1px solid var(--workbench-border);
  padding-top: 0.85rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem 1.25rem;
}

.manifest-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.manifest-key {
  color: var(--workbench-ink);
  font-weight: 500;
}

.manifest-val {
  color: var(--workbench-muted);
}

/* Supported Harnesses Bar */
.harness-ledger {
  margin-top: 2.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.harness-caption {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.harness-items {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--ink);
}

/* Section Layout */
.section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--rule);
}

.section-intro {
  margin-bottom: 2.5rem;
}

.section-heading {
  font-size: clamp(1.85rem, 3.1vw, 2.65rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--ink);
  text-wrap: balance;
  max-width: 32ch;
  margin-bottom: 0.85rem;
}

.section-lead {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink-body);
  max-width: 65ch;
}

/* Interactive Multi-File Full-Stack Workbench (No nested cards!) */
.workbench {
  background-color: var(--workbench-bg);
  color: var(--workbench-ink);
  border: 1px solid var(--workbench-border);
  border-radius: 12px;
  overflow: hidden;
}

.workbench-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.9rem 1.25rem;
  background-color: var(--workbench-panel);
  border-bottom: 1px solid var(--workbench-border);
}

.blueprint-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.blueprint-tab {
  background-color: transparent;
  color: var(--workbench-muted);
  border: 1px solid var(--workbench-border);
  border-radius: 6px;
  padding: 0.45rem 0.85rem;
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 150ms var(--ease-out), background-color 150ms var(--ease-out), border-color 150ms var(--ease-out);
}

.blueprint-tab:hover {
  color: var(--workbench-ink);
  border-color: #3f4452;
}

.blueprint-tab.active {
  background-color: var(--signal-orange);
  color: #ffffff;
  border-color: var(--signal-orange);
}

.workbench-prompt-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background-color: #0c0d0f;
  border-bottom: 1px solid var(--workbench-border);
  align-items: center;
}

.workbench-prompt-input {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--workbench-ink);
  font-size: 0.9375rem;
  line-height: 1.5;
  resize: none;
}

.workbench-prompt-input:focus {
  outline: none;
}

.workbench-panes {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 360px;
}

.workbench-sidebar {
  border-right: 1px solid var(--workbench-border);
  background-color: #131418;
  display: flex;
  flex-direction: column;
}

.file-tab-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--workbench-border);
  padding: 0.85rem 1.1rem;
  color: var(--workbench-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: background-color 150ms var(--ease-out), color 150ms var(--ease-out);
}

.file-tab-btn:hover {
  background-color: rgba(255, 255, 255, 0.03);
  color: var(--workbench-ink);
}

.file-tab-btn.active {
  background-color: #1d2028;
  color: var(--workbench-ink);
  font-weight: 600;
}

.file-layer-tag {
  font-size: 0.75rem;
  color: var(--signal-amber-ink);
}

.workbench-editor {
  padding: 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.active-skills-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--workbench-border);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--workbench-muted);
}

.skill-chip {
  background-color: #1e2129;
  color: var(--workbench-ink);
  border: 1px solid #323642;
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.code-output {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.65;
  color: #e2e8f0;
  white-space: pre-wrap;
  overflow-x: auto;
}

/* Section 2: Architectural Specification Ledger (Vision Elaboration Comparison) */
.comparison-ledger {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: 2.5rem;
}

.ledger-column {
  padding: 2rem 2rem 2rem 0;
}

.ledger-column + .ledger-column {
  border-left: 1px solid var(--rule-strong);
  padding: 2rem 0 2rem 2rem;
}

.ledger-status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  margin-bottom: 0.85rem;
}

.status-blocked {
  background-color: #fce8eb;
  color: var(--signal-crimson);
}

.status-verified {
  background-color: #dff2ea;
  color: var(--signal-green);
}

.ledger-title {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-wrap: balance;
  margin-bottom: 0.85rem;
}

.ledger-prompt-sample {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--canvas-elevated);
  border-left: 1px solid var(--ink);
  padding: 0.9rem 1rem;
  margin-bottom: 1.15rem;
  max-width: 60ch;
}

.ledger-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
  max-width: 60ch;
}

.ledger-points li {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--ink-body);
}

.ledger-points strong {
  color: var(--ink);
}

.ledger-trace {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  background-color: var(--workbench-bg);
  color: var(--workbench-ink);
  padding: 0.9rem 1rem;
  border-radius: 6px;
  white-space: pre-wrap;
}

/* Interactive Vision Clarity Inspector */
.vision-inspector {
  background-color: var(--surface-paper);
  border: 1px solid var(--rule-strong);
  border-radius: 10px;
  padding: 1.75rem;
}

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

.inspector-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ink);
}

.inspector-textarea {
  width: 100%;
  background-color: var(--canvas);
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 1.15rem;
  resize: vertical;
}

.inspector-verdict-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 1.15rem;
}

.inspector-guidance {
  font-size: 0.9375rem;
  color: var(--ink-body);
  max-width: 65ch;
}

.gauge-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.gauge-item {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.gauge-label-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-body);
}

.gauge-bar-bg {
  width: 100%;
  height: 6px;
  background-color: var(--canvas-elevated);
  border-radius: 3px;
  overflow: hidden;
}

.gauge-bar-fill {
  height: 100%;
  background-color: var(--signal-orange);
  transition: width 260ms var(--ease-out);
}

/* Section 3: Architectural Blueprint Matrix (Open Hairline Grid, Not Box Cards) */
.architecture-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule-strong);
  border-left: 1px solid var(--rule-strong);
}

.matrix-cell {
  padding: 1.85rem;
  border-right: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.matrix-title {
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.015em;
  text-wrap: balance;
  margin-bottom: 0.6rem;
}

.matrix-copy {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--ink-body);
  max-width: 58ch;
}

.matrix-copy code {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  background-color: var(--canvas-elevated);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

/* Footer */
.footer {
  padding: 3rem 0;
  font-size: 0.9375rem;
  color: var(--ink-muted);
}

.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-link {
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .hero-layout,
  .comparison-ledger,
  .workbench-panes {
    grid-template-columns: 1fr;
  }
  .ledger-column {
    padding: 1.5rem 0;
  }
  .ledger-column + .ledger-column {
    border-left: none;
    border-top: 1px solid var(--rule-strong);
    padding: 1.5rem 0;
  }
  .workbench-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--workbench-border);
    flex-direction: row;
    overflow-x: auto;
  }
  .file-tab-btn {
    border-bottom: none;
    border-right: 1px solid var(--workbench-border);
    white-space: nowrap;
    width: auto;
    gap: 0.75rem;
  }
  .architecture-matrix {
    grid-template-columns: 1fr;
  }
  .gauge-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-list {
    display: none;
  }
  .workbench-prompt-bar {
    grid-template-columns: 1fr;
  }
  .layer-manifest {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}