/* ============================================
   TRIBUNUS.DEV — Design System & Styles
   Dark-first with light mode, gold accent, zero dependencies
   ============================================ */

/* ---- Custom Properties ---- */
:root {
  /* Colors — Dark (default) */
  --bg: #0a0a0f;
  --surface: #14141f;
  --surface-raised: #1c1c2a;
  --surface-hover: #222232;
  --border: #2a2a3a;
  --border-gold: rgba(212, 168, 83, 0.25);
  --accent: #d4a853;
  --accent-hover: #e0b963;
  --accent-dim: rgba(212, 168, 83, 0.15);
  --text: #e8e6e3;
  --text-muted: #9898a8;
  --text-dim: #6b6b7a;

  /* Light mode override */
  &[data-theme="light"] {
    --bg: #fafaf6;
    --surface: #ffffff;
    --surface-raised: #f5f4ee;
    --surface-hover: #eeede5;
    --border: #e2e0d4;
    --border-gold: rgba(168, 128, 48, 0.25);
    --accent: #b08030;
    --accent-hover: #c09038;
    --accent-dim: rgba(168, 128, 48, 0.10);
    --text: #1a1a16;
    --text-muted: #5a5850;
    --text-dim: #8a8880;
  }

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "Courier New", "SF Mono", "Fira Code", "Cascadia Code", monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Sizing */
  --max-width: 1200px;
  --nav-height: 3.5rem;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-out);
  --transition-slow: 400ms var(--ease-out);
}

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

html {
  color-scheme: light dark;
}

/* Smooth theme transitions */
body {
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

.section,
.hero,
.nav-bar,
.compute-arch,
.compute-stat,
.compute-feature,
.explain-card,
.evidence-card,
.claim-block,
.bento-card,
.capability-shape,
.faq-details,
.blog-card,
.tab-label,
.pipeline-stage,
.lang-select,
.roadmap-phase,
.proof-callout,
.explain-cta,
.hero-cta {
  transition: background-color var(--transition-slow), color var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
}

/* Theme toggle button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-base);
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

/* Show/hide sun/moon icons based on theme */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scrollbar-color: var(--border) var(--bg);
  scrollbar-width: thin;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-dim);
}

::selection {
  background: var(--accent-dim);
  color: var(--accent);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---- Focus Styles ---- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--accent);
  color: var(--bg);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
  transition: top 200ms;
}
.skip-link:focus {
  top: var(--space-md);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Navigation ---- */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.72);
  backdrop-filter: blur(16px) saturate(120%);
  -webkit-backdrop-filter: blur(16px) saturate(120%);
  border-bottom: 1px solid var(--border);
  transition: background 300ms var(--ease-out), border-color 300ms var(--ease-out);
}

.nav-bar--scrolled {
  background: rgba(10, 10, 15, 0.92);
  border-bottom-color: var(--border-gold);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: clamp(1rem, 2vw, 1.125rem);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent);
  transition: color var(--transition-fast);
}
.nav-logo:hover {
  color: var(--accent-hover);
}

.nav-cta {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.nav-cta:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-4xl) var(--space-xl);
  overflow: hidden;
  isolation: isolate;
}

/* Geometric grid background */
.hero-grid-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.06;
  background-image:
    linear-gradient(rgba(212, 168, 83, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 168, 83, 0.3) 1px, transparent 1px);
  background-size: 60px 60px;
  background-position: center center;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 30%, transparent 70%);
  animation: grid-drift 30s linear infinite;
}

@keyframes grid-drift {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(60px, 60px) rotate(1deg); }
}

/* Subtle radial glow */
.hero-accent {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 168, 83, 0.04) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 600px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  font-size: 1rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  margin-top: var(--space-md);
}
.hero-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 32px rgba(212, 168, 83, 0.2);
}

/* ---- Sections ---- */
.section {
  padding: var(--space-4xl) var(--space-xl);
}

.section--alt {
  background: var(--surface);
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-heading {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--text);
  margin-bottom: var(--space-3xl);
  text-align: center;
}

/* ---- Bento Grid (What It Does) ---- */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: auto auto;
  gap: var(--space-lg);
  container-type: inline-size;
}

.bento-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.bento-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, var(--accent-dim), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.bento-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  border-color: var(--border-gold);
}
.bento-card:hover::before {
  opacity: 1;
}

.bento-card--wide {
  grid-column: span 2;
}

.bento-card--tall {
  grid-row: span 2;
}

.bento-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.bento-title {
  font-size: clamp(1.125rem, 1.5vw, 1.25rem);
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.bento-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---- Geometric Icons ---- */
.geo {
  width: 100%;
  height: 100%;
}

.geo-nodes {
  position: relative;
}
.geo-nodes::before {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  box-shadow:
    14px 14px 0 -2px var(--accent),
    -14px 14px 0 -2px var(--accent),
    0 28px 0 -3px var(--accent);
}
.geo-nodes::after {
  content: "";
  position: absolute;
  width: 30px;
  height: 1px;
  background: var(--accent);
  opacity: 0.4;
  top: 4px;
  left: calc(50% - 15px);
  transform: rotate(45deg);
}

.geo-eye {
  position: relative;
}
.geo-eye::before {
  content: "";
  position: absolute;
  width: 32px;
  height: 20px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.geo-eye::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.geo-shield {
  position: relative;
}
.geo-shield::before {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border-left: 14px solid transparent;
  border-right: 14px solid transparent;
  border-bottom: 28px solid var(--accent);
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
}
.geo-shield::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 10px;
  border: 2px solid var(--accent);
  border-top: none;
  border-radius: 0 0 3px 3px;
}

.geo-ledger {
  position: relative;
}
.geo-ledger::before {
  content: "";
  position: absolute;
  width: 28px;
  height: 34px;
  border: 2px solid var(--accent);
  border-radius: 2px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.geo-ledger::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 2px;
  background: var(--accent);
  opacity: 0.5;
  top: calc(50% - 4px);
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 8px 0 var(--accent);
}

/* ---- Enterprise Capabilities ---- */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.capability-card {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.capability-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  border-color: var(--border-gold);
}

.capability-shape {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.capability-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.capability-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Capability geometric shapes */
.capability-shape--diamond {
  width: 22px;
  height: 22px;
  background: var(--accent);
  transform: rotate(45deg);
  margin: 7px;
}
.capability-shape--circle {
  width: 22px;
  height: 22px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  margin: 7px;
}
.capability-shape--chevron {
  width: 0;
  height: 0;
  border-left: 12px solid transparent;
  border-right: 12px solid transparent;
  border-top: 16px solid var(--accent);
  margin: 10px 6px;
}
.capability-shape--hexagon {
  width: 22px;
  height: 13px;
  background: var(--accent);
  margin: 12px 7px;
  position: relative;
}
.capability-shape--hexagon::before,
.capability-shape--hexagon::after {
  content: "";
  position: absolute;
  width: 0;
  border-left: 11px solid transparent;
  border-right: 11px solid transparent;
}
.capability-shape--hexagon::before {
  bottom: 100%;
  border-bottom: 7px solid var(--accent);
}
.capability-shape--hexagon::after {
  top: 100%;
  border-top: 7px solid var(--accent);
}
.capability-shape--shield {
  width: 18px;
  height: 24px;
  background: var(--accent);
  border-radius: 2px 2px 4px 4px;
  margin: 6px 9px;
  position: relative;
}
.capability-shape--shield::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 6px;
  background: var(--accent);
  border-radius: 2px 2px 0 0;
}
.capability-shape--cross {
  position: relative;
  width: 22px;
  height: 22px;
  margin: 7px;
}
.capability-shape--cross::before,
.capability-shape--cross::after {
  content: "";
  position: absolute;
  background: var(--accent);
}
.capability-shape--cross::before {
  width: 100%;
  height: 2px;
  top: 50%;
  transform: translateY(-50%);
}
.capability-shape--cross::after {
  width: 2px;
  height: 100%;
  left: 50%;
  transform: translateX(-50%);
}
.capability-shape--target {
  width: 22px;
  height: 22px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  margin: 7px;
  position: relative;
}
.capability-shape--target::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* ---- Team Coordination ---- */
.team-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.team-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.team-text .section-heading {
  text-align: left;
  margin-bottom: 0;
}

.team-paragraph {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* CSS-Only Team Diagram */
.team-diagram {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 340px;
}

.diagram-container {
  position: relative;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
  padding: var(--space-xl);
}

.diagram-row {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
}

.diagram-row--engineers {
  gap: var(--space-lg);
}

.diagram-agent {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 2px;
  opacity: 0.9;
}

.diagram-agent--sub {
  opacity: 0.5;
}

.diagram-lines {
  position: absolute;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 60px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  opacity: 0.3;
}

.diagram-coordinator {
  padding: var(--space-sm) var(--space-xl);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-dim);
}

.diagram-row--engineers {
  position: relative;
  padding-top: var(--space-md);
}

.diagram-row--engineers::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: var(--space-md);
  background: linear-gradient(to bottom, var(--accent), transparent);
  opacity: 0.3;
}

.diagram-engineer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.diagram-engineer span {
  font-size: 0.6875rem;
  color: var(--text-dim);
  font-weight: 500;
  letter-spacing: 0.05em;
}

.diagram-avatar {
  width: 24px;
  height: 24px;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  background: var(--surface-raised);
}

/* ---- Product Proof Diagram ---- */
.proof-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  max-width: 740px;
  margin: 0 auto var(--space-2xl);
  padding: var(--space-lg) 0;
}

.proof-node {
  background: var(--surface);
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.proof-node--you {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
}

.proof-node--plane {
  width: 168px;
  padding: var(--space-md) var(--space-sm);
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: center;
  line-height: 1.35;
  box-shadow: 0 0 24px rgba(212,168,83,0.12);
}

.proof-connector {
  width: 48px;
  height: 0;
  border-top: 1.5px dashed var(--accent);
  opacity: 0.45;
  flex-shrink: 0;
}

.proof-agents {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xs);
  position: relative;
}

.proof-node--agent {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border-width: 1.5px;
  border-color: var(--border);
  background: var(--surface-raised);
}

/* Proof Callouts */
.proof-callouts {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 740px;
  margin: 0 auto;
}

.proof-callout {
  padding: var(--space-md) var(--space-lg);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 8px 8px 0;
}

.proof-callout--left {
  align-self: flex-start;
  max-width: 540px;
}

.proof-callout--center {
  align-self: center;
  max-width: 540px;
}

.proof-callout--right {
  align-self: flex-end;
  max-width: 540px;
}

.proof-callout-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: var(--space-xs);
}

.proof-callout-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Roadmap badge for team section */
.roadmap-badge {
  display: inline-block;
  padding: 2px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 3px;
  margin-bottom: var(--space-sm);
}

/* ---- Download ---- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  max-width: 800px;
  margin: 0 auto;
}

.download-card {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.download-card:not(.download-card--pending):hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  border-color: var(--accent);
}

.download-card--pending {
  opacity: 0.7;
}

.download-card-inner {
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: flex-start;
}

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

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

.version-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-dim);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.version-badge--pending {
  color: var(--text-dim);
  background: rgba(107, 107, 122, 0.15);
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-xl);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.download-btn:hover {
  background: var(--accent-hover);
}

.download-btn-icon {
  font-size: 1.125rem;
  line-height: 1;
}

.download-btn--disabled {
  background: var(--surface);
  color: var(--text-dim);
  border: 1px solid var(--border);
  cursor: not-allowed;
}

/* ---- Footer ---- */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-xl) var(--space-xl);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.footer-tagline {
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
}

.footer-link {
  font-size: 0.8125rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}
.footer-link:hover {
  color: var(--accent);
}

/* ---- Scroll Reveal ---- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children within grids */
.bento-card[data-reveal]:nth-child(1) { transition-delay: 0ms; }
.bento-card[data-reveal]:nth-child(2) { transition-delay: 80ms; }
.bento-card[data-reveal]:nth-child(3) { transition-delay: 160ms; }
.bento-card[data-reveal]:nth-child(4) { transition-delay: 240ms; }

.capability-card[data-reveal]:nth-child(1) { transition-delay: 0ms; }
.capability-card[data-reveal]:nth-child(2) { transition-delay: 60ms; }
.capability-card[data-reveal]:nth-child(3) { transition-delay: 120ms; }
.capability-card[data-reveal]:nth-child(4) { transition-delay: 180ms; }
.capability-card[data-reveal]:nth-child(5) { transition-delay: 240ms; }
.capability-card[data-reveal]:nth-child(6) { transition-delay: 300ms; }
.capability-card[data-reveal]:nth-child(7) { transition-delay: 360ms; }

.proof-callout[data-reveal]:nth-child(1) { transition-delay: 0ms; }
.proof-callout[data-reveal]:nth-child(2) { transition-delay: 80ms; }
.proof-callout[data-reveal]:nth-child(3) { transition-delay: 160ms; }

/* ---- Container Queries for Bento Grid ---- */
@container (max-width: 600px) {
  .bento-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
  .bento-card--wide {
    grid-column: span 1;
  }
  .bento-card--tall {
    grid-row: span 1;
  }
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .bento-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
  }
  .bento-card--wide {
    grid-column: span 2;
  }
  .bento-card--tall {
    grid-row: span 1;
  }
}

@media (max-width: 768px) {
  .team-layout {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .team-text .section-heading {
    text-align: center;
  }

  .team-text {
    text-align: center;
  }

  .section {
    padding: var(--space-3xl) var(--space-lg);
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .hero {
    min-height: 90vh;
    padding: var(--space-3xl) var(--space-lg);
  }

  .proof-diagram {
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-md) 0;
  }

  .proof-connector {
    width: 0;
    height: 28px;
    border-top: 0;
    border-left: 1.5px dashed var(--accent);
  }

  .proof-agents {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
  }

  .proof-callout--left,
  .proof-callout--center,
  .proof-callout--right {
    align-self: stretch;
    max-width: none;
  }
}

@media (max-width: 560px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-card--wide {
    grid-column: span 1;
  }

  .capabilities-grid {
    grid-template-columns: 1fr;
  }

  .download-grid {
    grid-template-columns: 1fr;
  }

  .nav-inner {
    padding: 0 var(--space-md);
  }

  .download-card-inner {
    padding: var(--space-xl);
  }

  .proof-agents {
    grid-template-columns: repeat(4, 1fr);
  }

  .proof-callout {
    padding: var(--space-sm) var(--space-md);
  }
}


/* ---- Origin Story Tabs ---- */
.tab-root {
  margin-top: var(--space-2xl);
}

.tab-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.tab-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-xl);
}

.tab-label {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  user-select: none;
}

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

/* Active tab label — driven by radio :checked */
#tab-little-frictions:checked ~ .tab-nav label[for="tab-little-frictions"],
#tab-fork:checked ~ .tab-nav label[for="tab-fork"],
#tab-rebuild:checked ~ .tab-nav label[for="tab-rebuild"],
#tab-philosophy:checked ~ .tab-nav label[for="tab-philosophy"],
#tab-where-now:checked ~ .tab-nav label[for="tab-where-now"],
#tab-where-going:checked ~ .tab-nav label[for="tab-where-going"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Panel visibility — hidden by default, shown via :checked */
.tab-panel {
  display: none;
  animation: tab-fade 300ms var(--ease-out);
}

#tab-little-frictions:checked ~ .tab-panels .tab-panel:nth-child(1),
#tab-fork:checked ~ .tab-panels .tab-panel:nth-child(2),
#tab-rebuild:checked ~ .tab-panels .tab-panel:nth-child(3),
#tab-philosophy:checked ~ .tab-panels .tab-panel:nth-child(4),
#tab-where-now:checked ~ .tab-panels .tab-panel:nth-child(5),
#tab-where-going:checked ~ .tab-panels .tab-panel:nth-child(6) {
  display: block;
}

@keyframes tab-fade {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.tab-panel p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.75;
  max-width: 72ch;
}

.tab-panel p + p {
  margin-top: var(--space-md);
}

.tab-panel em {
  color: var(--accent);
  font-style: italic;
}

/* Responsive: collapse tabs to vertical list on mobile */
@media (max-width: 600px) {
  .tab-nav {
    flex-direction: column;
    border-bottom: none;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
  }

  .tab-label {
    border-bottom: none;
    border-left: 2px solid transparent;
    margin-bottom: 0;
    padding: var(--space-sm) var(--space-md);
  }

  #tab-little-frictions:checked ~ .tab-nav label[for="tab-little-frictions"],
  #tab-fork:checked ~ .tab-nav label[for="tab-fork"],
  #tab-rebuild:checked ~ .tab-nav label[for="tab-rebuild"],
  #tab-philosophy:checked ~ .tab-nav label[for="tab-philosophy"],
  #tab-where-now:checked ~ .tab-nav label[for="tab-where-now"],
  #tab-where-going:checked ~ .tab-nav label[for="tab-where-going"] {
    border-left-color: var(--accent);
    border-bottom-color: transparent;
    background: var(--surface);
  }
}

/* ---- Blog ---- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.blog-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.blog-card:hover {
  border-color: var(--border-gold);
  transform: translateY(-2px);
}

.blog-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.blog-card-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.blog-card-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid var(--border-gold);
  border-radius: 9999px;
  padding: 0.25em 0.75em;
  letter-spacing: 0.02em;
}

/* Responsive: stack blog cards */
@media (max-width: 768px) {
  .blog-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Roadmap Timeline ---- */
.roadmap-timeline {
  position: relative;
  margin-top: var(--space-2xl);
  padding-left: var(--space-2xl);
}

.roadmap-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.roadmap-phase {
  position: relative;
  padding-bottom: var(--space-2xl);
}

.roadmap-phase:last-child {
  padding-bottom: 0;
}

.roadmap-marker {
  position: absolute;
  left: calc(-1 * var(--space-2xl) + 2px);
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  z-index: 1;
}

.roadmap-phase-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}

.roadmap-phase-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.roadmap-phase-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 64ch;
}

/* ---- FAQ ---- */
.faq-list {
  margin-top: var(--space-2xl);
  max-width: 800px;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:first-child {
  border-top: 1px solid var(--border);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) 0;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast);
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::marker {
  display: none;
  content: '';
}

/* Custom disclosure indicator */
.faq-question::before {
  content: '+';
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--accent);
  transition: transform var(--transition-fast);
}

details[open] > .faq-question::before {
  content: '\2212';
}

.faq-question:hover {
  color: var(--accent);
}

.faq-answer {
  padding: 0 0 var(--space-lg) 28px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 72ch;
}

/* ---- Contact ---- */
.contact-content {
  text-align: center;
  margin-top: var(--space-2xl);
}

.contact-item {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.contact-item strong {
  color: var(--text);
  margin-right: var(--space-sm);
}

.contact-link {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.contact-tagline {
  margin-top: var(--space-xl);
  font-size: 0.95rem;
  color: var(--text-dim);
  font-style: italic;
}

/* ---- Section Badge ---- */
.section-badge {
  display: block;
  width: fit-content;
  margin: 0 auto var(--space-md);
  padding: 2px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 3px;
}

/* ---- Section Lead ---- */
.section-lead {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-3xl);
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- Compute Engine Architecture Diagram ---- */
.compute-arch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  max-width: 740px;
  margin: 0 auto var(--space-2xl);
  padding: var(--space-xl);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.compute-layer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.compute-layer-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.compute-layer-nodes {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.compute-node {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.compute-bridge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.compute-bridge-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-align: center;
  line-height: 1.3;
}

.compute-bridge-arrow {
  width: 40px;
  height: 0;
  border-top: 2px dashed var(--accent);
  opacity: 0.5;
}

/* ---- Compute Stats ---- */
.compute-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.compute-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.compute-stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.compute-stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---- Compute Features ---- */
.compute-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.compute-feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.compute-feature:hover {
  border-color: var(--border-gold);
  transform: translateY(-2px);
}

.compute-feature-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.compute-feature-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ---- Pipeline Visualization ---- */
.pipeline-viz {
  max-width: 900px;
  margin: 0 auto var(--space-lg);
}

.pipeline-phase {
  margin-bottom: var(--space-md);
}

.pipeline-phase-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: var(--space-xs);
}

.pipeline-stages {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.pipeline-stage {
  width: 24px;
  height: 8px;
  background: var(--accent);
  opacity: 0.6;
  border-radius: 2px;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  cursor: default;
}

.pipeline-stage:hover {
  opacity: 1;
  transform: scaleY(1.8);
}

.pipeline-stage--wide {
  width: 52px;
}

.pipeline-caption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: var(--space-3xl);
  font-style: italic;
}

/* ---- Evidence Grid ---- */
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.evidence-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.evidence-card:hover {
  border-color: var(--border-gold);
  transform: translateY(-2px);
}

.evidence-icon {
  width: 40px;
  height: 40px;
}

.evidence-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.evidence-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---- Claim Block ---- */
.claim-block {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-xl);
  background: var(--surface);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-md);
}

.claim-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-md);
  padding: 2px 8px;
  border: 1px solid var(--accent);
  border-radius: 3px;
}

.claim-text {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.7;
  font-style: italic;
  border-left: 3px solid var(--accent);
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.claim-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

/* ---- Roadmap Alternate Marker ---- */
.roadmap-marker--alt {
  background: var(--surface);
  border-color: var(--accent);
  border-width: 2px;
  border-style: solid;
}

/* ---- Responsive: Compute & Evidence ---- */
@media (max-width: 768px) {
  .compute-arch {
    flex-direction: column;
    gap: var(--space-md);
  }

  .compute-bridge {
    flex-direction: row;
  }

  .compute-bridge-arrow {
    width: 0;
    height: 32px;
    border-top: 0;
    border-left: 2px dashed var(--accent);
  }

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

  .compute-features {
    grid-template-columns: 1fr;
  }

  .evidence-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .compute-stats {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---- Stagger evidence cards ---- */
.evidence-card[data-reveal]:nth-child(1) { transition-delay: 0ms; }
.evidence-card[data-reveal]:nth-child(2) { transition-delay: 80ms; }
.evidence-card[data-reveal]:nth-child(3) { transition-delay: 160ms; }

.compute-feature[data-reveal]:nth-child(1) { transition-delay: 0ms; }
.compute-feature[data-reveal]:nth-child(2) { transition-delay: 80ms; }
.compute-feature[data-reveal]:nth-child(3) { transition-delay: 160ms; }
.compute-feature[data-reveal]:nth-child(4) { transition-delay: 240ms; }

/* ---- Layman Explainer Flow ---- */
.explain-flow {
  max-width: 720px;
  margin: 0 auto;
}

.explain-step {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.explain-number {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-xs);
}

.explain-card {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: border-color var(--transition-base);
}

.explain-card:hover {
  border-color: var(--border-gold);
}

.explain-icon-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.explain-icon-row--dual {
  gap: var(--space-md);
}

.explain-icon-plus {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-dim);
}

.explain-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
}

/* Disk icon — local storage */
.explain-icon--disk {
  background: var(--surface-raised);
  border: 2px solid var(--accent);
  border-radius: 50%;
  position: relative;
  overflow: hidden;
}
.explain-icon--disk::before {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.explain-icon--disk::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--bg);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* GPU icon — MLX */
.explain-icon--gpu {
  background: var(--accent-dim);
  border: 2px solid var(--accent);
  position: relative;
}
.explain-icon--gpu::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1.5px solid var(--accent);
  border-radius: 2px;
}
.explain-icon--gpu::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 1.5px;
  background: var(--accent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 5px 0 var(--accent), 0 -5px 0 var(--accent);
}

/* ANE icon — Neural Engine */
.explain-icon--ane {
  background: var(--accent-dim);
  border: 2px solid var(--accent);
  position: relative;
}
.explain-icon--ane::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1.5px solid var(--accent);
  border-radius: 1px;
}
.explain-icon--ane::after {
  content: "";
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--accent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow:
    -8px -8px 0 var(--accent),
    8px -8px 0 var(--accent),
    -8px 8px 0 var(--accent),
    8px 8px 0 var(--accent),
    -8px 0 0 var(--accent),
    8px 0 0 var(--accent),
    0 -8px 0 var(--accent),
    0 8px 0 var(--accent);
}

/* Pipeline stages icon */
.explain-icon--stages {
  background: var(--surface-raised);
  border: 2px solid var(--accent);
  position: relative;
  overflow: hidden;
}
.explain-icon--stages::before {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  top: 10px;
  height: 1.5px;
  background: var(--accent);
  opacity: 0.5;
  box-shadow:
    0 4px 0 var(--accent),
    0 8px 0 var(--accent),
    0 12px 0 var(--accent),
    0 16px 0 var(--accent),
    0 20px 0 var(--accent),
    0 24px 0 var(--accent);
}
.explain-icon--stages::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 8px;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}

/* Deterministic icon — equals with check */
.explain-icon--deterministic {
  background: var(--surface-raised);
  border: 2px solid var(--accent);
  position: relative;
}
.explain-icon--deterministic::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 24px;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 -6px 0 var(--accent), 0 6px 0 var(--accent);
}

/* Receipt icon */
.explain-icon--receipt {
  background: var(--surface-raised);
  border: 2px solid var(--accent);
  position: relative;
}
.explain-icon--receipt::before {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1.5px solid rgba(212, 168, 83, 0.4);
  border-radius: 1px;
  border-bottom-style: dashed;
}
.explain-icon--receipt::after {
  content: "";
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 5px;
  border: 1.5px solid var(--accent);
  border-top: none;
  border-radius: 0 0 2px 2px;
}

.explain-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.explain-body {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.explain-data {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.explain-data-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.explain-data-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.explain-data-value {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  background: none;
  padding: 0;
}

.explain-data-value--green {
  color: #4ade80;
}

/* Arrow connectors between steps */
.explain-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-sm) 0;
  margin-left: 22px;
}

.explain-arrow-line {
  width: 2px;
  height: 28px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
  opacity: 0.5;
}

.explain-arrow-head {
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 7px solid var(--accent);
  opacity: 0.5;
}

/* CTA at bottom of explainer */
.explain-cta {
  max-width: 640px;
  margin: var(--space-3xl) auto 0;
  padding: var(--space-xl);
  background: var(--surface);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-md);
  text-align: center;
}

.explain-cta-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  font-style: italic;
}

/* Stagger explain steps */
.explain-step[data-reveal]:nth-child(1) { transition-delay: 0ms; }
.explain-step[data-reveal]:nth-child(3) { transition-delay: 120ms; }
.explain-step[data-reveal]:nth-child(5) { transition-delay: 240ms; }
.explain-step[data-reveal]:nth-child(7) { transition-delay: 360ms; }
.explain-step[data-reveal]:nth-child(9) { transition-delay: 480ms; }

/* Responsive explainer */
@media (max-width: 600px) {
  .explain-step {
    gap: var(--space-md);
  }

  .explain-number {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .explain-card {
    padding: var(--space-lg);
  }

  .explain-arrow {
    margin-left: 18px;
  }

  .explain-data-row {
    flex-direction: column;
  }
}
/* ---- Scroll-Driven Animations (progressive enhancement) ---- */
@supports (animation-timeline: scroll()) {
  .section {
    animation: section-reveal linear both;
    animation-timeline: view();
    animation-range: entry 5% cover 30%;
  }

  @keyframes section-reveal {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Disable JS reveal when native scroll-driven animations work */
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* View Transitions */
@view-transition {
  navigation: auto;
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .hero-grid-bg {
    animation: none;
  }
}

/* ---- Language Switcher ---- */
.lang-switcher {
  display: flex;
  align-items: center;
}

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-md);
  font-size: 0.8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-fast);
  padding-right: 1.75rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%239898a8'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
}

.lang-select:hover {
  border-color: var(--accent);
  color: var(--text);
}

.lang-select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.lang-select option {
  background: var(--surface);
  color: var(--text);
}

/* ---- RTL Support (Farsi/Persian) ---- */
[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

[dir="rtl"] .nav-inner {
  flex-direction: row-reverse;
}

[dir="rtl"] .faq-question::before {
  order: -1;
}

[dir="rtl"] .faq-answer {
  padding: 0 var(--space-lg) var(--space-lg) 0;
}

[dir="rtl"] .proof-callout {
  border-left: none;
  border-right: 3px solid var(--accent);
  border-radius: 8px 0 0 8px;
}

[dir="rtl"] .proof-callout--left {
  align-self: flex-end;
}

[dir="rtl"] .proof-callout--right {
  align-self: flex-start;
}

[dir="rtl"] .claim-text {
  border-left: none;
  border-right: 3px solid var(--accent);
  padding-left: 0;
  padding-right: var(--space-lg);
}

[dir="rtl"] .roadmap-timeline {
  padding-left: 0;
  padding-right: var(--space-2xl);
}

[dir="rtl"] .roadmap-timeline::before {
  left: auto;
  right: 7px;
}

[dir="rtl"] .roadmap-marker {
  left: auto;
  right: calc(-1 * var(--space-2xl) + 2px);
}

[dir="rtl"] .explain-step {
  flex-direction: row-reverse;
}

[dir="rtl"] .explain-arrow {
  margin-left: 0;
  margin-right: 22px;
}

/* CJK font stack */
[lang="zh"] body,
[lang="ja"] body,
[lang="ko"] body {
  font-family: "Inter", "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", system-ui, -apple-system, sans-serif;
}

/* Arabic script (Arabic, Persian, Urdu) */
[lang="ar"] body,
[lang="fa"] body,
[lang="ur"] body {
  font-family: "Inter", "Noto Naskh Arabic", "Noto Sans Arabic", system-ui, -apple-system, sans-serif;
}

/* Hebrew */
[lang="he"] body {
  font-family: "Inter", "Noto Sans Hebrew", system-ui, -apple-system, sans-serif;
}

/* Devanagari (Hindi, Marathi) */
[lang="hi"] body,
[lang="mr"] body {
  font-family: "Inter", "Noto Sans Devanagari", system-ui, -apple-system, sans-serif;
}

/* Bengali */
[lang="bn"] body {
  font-family: "Inter", "Noto Sans Bengali", system-ui, -apple-system, sans-serif;
}

/* Tamil */
[lang="ta"] body {
  font-family: "Inter", "Noto Sans Tamil", system-ui, -apple-system, sans-serif;
}

/* Telugu */
[lang="te"] body {
  font-family: "Inter", "Noto Sans Telugu", system-ui, -apple-system, sans-serif;
}

/* Thai */
[lang="th"] body {
  font-family: "Inter", "Noto Sans Thai", system-ui, -apple-system, sans-serif;
}

/* Greek */
[lang="el"] body {
  font-family: "Inter", "Noto Sans", system-ui, -apple-system, sans-serif;
}

/* RTL languages — increased line height for readability */
[lang="ar"] .hero-title,
[lang="ar"] .section-heading,
[lang="fa"] .hero-title,
[lang="fa"] .section-heading,
[lang="ur"] .hero-title,
[lang="ur"] .section-heading,
[lang="he"] .hero-title,
[lang="he"] .section-heading {
  line-height: 1.5;
}

/* ══════════════════════════════════════════════════════════════════════
   ANIMATED SVG KEYFRAMES
   ══════════════════════════════════════════════════════════════════════ */

/* ── Hero Network ─────────────────────────────────────────────────── */
.hero-network {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.35;
  pointer-events: none;
}

/* Connections fade in/out */
.hn-line {
  animation: hn-line-fade 8s ease-in-out infinite;
  transform-origin: center;
}

@keyframes hn-line-fade {
  0%, 100% { opacity: 0.15; }
  50% { opacity: 0.6; }
}

/* Nodes breathe */
.hn-node {
  animation: hn-breathe 4s ease-in-out infinite;
  opacity: 0.7;
}

.hn-coord {
  opacity: 0.9;
  animation-duration: 3.5s;
}

.hn-agent {
  animation-duration: 5s;
}

@keyframes hn-breathe {
  0%, 100% { opacity: 0.5; r: inherit; }
  50% { opacity: 0.95; }
}

/* Expanding pulse rings from coordinators */
.hn-pulse {
  animation: hn-ring 3s ease-out infinite;
}

@keyframes hn-ring {
  0% { r: 4; opacity: 0.6; }
  100% { r: 22; opacity: 0; }
}

/* ── Compute Tensor Flow ───────────────────────────────────────────── */
.tensor-flow {
  width: 80px;
  height: 120px;
  flex-shrink: 0;
}

.tf-particle {
  animation: tf-flow 3s linear infinite;
}

@keyframes tf-flow {
  0% { cy: 20; opacity: 0; }
  10% { opacity: 0.9; }
  85% { opacity: 0.9; }
  100% { cy: 100; opacity: 0; }
}

.tf-pulse {
  animation: tf-ring 3s ease-out infinite;
}

@keyframes tf-ring {
  0% { r: 4; opacity: 0.5; }
  100% { r: 18; opacity: 0; }
}

/* ── Proof Connectors ──────────────────────────────────────────────── */
.proof-connector-svg {
  width: 48px;
  height: 4px;
  flex-shrink: 0;
}

.pc-dot {
  animation: pc-travel 2s ease-in-out infinite;
}

@keyframes pc-travel {
  0% { cx: 0; opacity: 0.6; }
  50% { cx: 44; opacity: 1; }
  100% { cx: 44; opacity: 0; }
}

/* ── Pipeline Stages Sequential Glow ───────────────────────────────── */
.ps-anim {
  animation: ps-glow 2.1s ease-in-out infinite;
}

@keyframes ps-glow {
  0%, 100% { opacity: 0.6; transform: scaleY(1); }
  10% { opacity: 1; transform: scaleY(1.8); box-shadow: 0 0 8px var(--accent); }
  20% { opacity: 0.6; transform: scaleY(1); box-shadow: none; }
}

/* Stagger pipeline stage animations */
.pipeline-stages .pipeline-stage:nth-child(1)  { animation-delay: 0.00s; }
.pipeline-stages .pipeline-stage:nth-child(2)  { animation-delay: 0.15s; }
.pipeline-stages .pipeline-stage:nth-child(3)  { animation-delay: 0.30s; }
.pipeline-stages .pipeline-stage:nth-child(4)  { animation-delay: 0.45s; }
.pipeline-stages .pipeline-stage:nth-child(5)  { animation-delay: 0.60s; }
.pipeline-stages .pipeline-stage:nth-child(6)  { animation-delay: 0.75s; }
.pipeline-stages .pipeline-stage:nth-child(7)  { animation-delay: 0.90s; }
.pipeline-stages .pipeline-stage:nth-child(8)  { animation-delay: 1.05s; }
.pipeline-stages .pipeline-stage:nth-child(9)  { animation-delay: 1.20s; }
.pipeline-stages .pipeline-stage:nth-child(10) { animation-delay: 1.35s; }
.pipeline-stages .pipeline-stage:nth-child(11) { animation-delay: 1.50s; }
.pipeline-stages .pipeline-stage:nth-child(12) { animation-delay: 1.65s; }
.pipeline-stages .pipeline-stage:nth-child(13) { animation-delay: 1.80s; }
.pipeline-stages .pipeline-stage:nth-child(14) { animation-delay: 1.95s; }

/* ── Reduced Motion: disable all animations ────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .hn-line,
  .hn-node,
  .hn-coord,
  .hn-agent,
  .hn-pulse,
  .tf-particle,
  .tf-pulse,
  .pc-dot,
  .ps-anim {
    animation: none !important;
  }

  .hero-network {
    opacity: 0.25;
  }

  .pipeline-stage {
    opacity: 0.6;
  }
}

/* ---- Print ---- */
@media print {
  .nav-bar,
  .hero-grid-bg,
  .hero-accent {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }
}