/* ============================================
   HEILLON Protocol — Landing Page
   Infrastructure de Verificação de Decisões
   ============================================ */

:root {
  /* Primary background */
  --bg-deep: #0B0F19;
  --bg-mid: #0E1628;
  --bg-elevated: #101B2E;
  
  /* Accent colors */
  --accent-cyan: #00D4FF;
  --accent-cyan-bright: #00E6FF;
  --accent-green: #00FFB2;
  
  /* Text */
  --text-primary: #E8EDF5;
  --text-secondary: #8B99B0;
  --text-muted: #5A6B85;
  
  /* Typography */
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', 'Inter', system-ui, sans-serif;
  
  /* Spacing */
  --container-max: 960px;
  --section-pad: clamp(4rem, 10vw, 8rem);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-deep);
  min-height: 100vh;
  overflow-x: hidden;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: max(0.5rem, calc(1.5rem - 4cm));
  padding-right: 1.5rem;
}

/* ============================================
   Background Effects
   ============================================ */

.grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: 
    linear-gradient(rgba(0, 212, 255, 0.014) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.014) 1px, transparent 1px);
  background-size: 48px 48px;
}

.flow-lines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.flow-lines::before,
.flow-lines::after {
  content: '';
  position: absolute;
  inset: -20%;
}

.flow-lines::before {
  background: repeating-linear-gradient(
    90deg,
    transparent 0px,
    transparent 80px,
    rgba(0, 212, 255, 0.08) 80px,
    rgba(0, 212, 255, 0.08) 81px
  );
  background-size: 200px 100%;
  animation: flow-horizontal 25s linear infinite;
}

.flow-lines::after {
  background: repeating-linear-gradient(
    95deg,
    transparent 0px,
    transparent 100px,
    rgba(0, 200, 240, 0.04) 100px,
    rgba(0, 200, 240, 0.04) 101px
  );
  background-size: 200px 100%;
  animation: flow-horizontal 38s linear infinite reverse;
}

@keyframes flow-horizontal {
  0% { background-position: 0 0; }
  100% { background-position: 200px 0; }
}

.data-stream {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 212, 255, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(0, 255, 178, 0.04), transparent);
}

/* Background decision stream — floating HDR cards */
.hdr-stream {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.hdr-stream-card {
  position: absolute;
  padding: 0.5rem 0.75rem;
  background: rgba(11, 15, 25, 0.85);
  border: 1px solid rgba(0, 212, 255, 0.12);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  opacity: 0;
  animation: hdr-stream-fade 12s ease-in-out infinite;
}

.hdr-stream-card-id {
  color: var(--accent-cyan);
}

.hdr-stream-card-outcome {
  color: var(--accent-green);
  margin-top: 0.15rem;
}

@keyframes hdr-stream-fade {
  0%, 100% {
    opacity: 0;
    transform: translateY(4px) scale(0.98);
  }
  15%, 85% {
    opacity: 0.35;
    transform: translateY(0) scale(1);
  }
  50% {
    opacity: 0.5;
    transform: translateY(-2px) scale(1);
  }
}

/* ============================================
   Header
   ============================================ */

.header {
  position: relative;
  z-index: 10;
  padding: 0.6rem 0;
}

.header--sticky {
  position: sticky;
  top: 0;
  background: rgba(11, 15, 25, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.06);
  transition: background 0.2s, border-color 0.2s;
}

.nav-link {
  position: relative;
  white-space: nowrap;
}

.nav-link.nav-link--active {
  color: var(--accent-cyan);
}

.nav-link.nav-link--active::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent-cyan);
}

.header__container,
.header .container {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  max-width: 100%;
  width: 100%;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.header .logo {
  justify-self: start;
}

.logo {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 0.4rem;
  flex-shrink: 0;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: opacity 0.2s;
}

.logo:hover {
  opacity: 0.9;
}

.header .nav {
  justify-self: center;
}

.logo-symbol {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.logo-label {
  font-family: var(--font-body);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  flex-wrap: nowrap;
  gap: 2.25rem;
  align-items: center;
}

.nav a {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--accent-cyan);
}

@media (max-width: 1200px) {
  .nav {
    gap: 1.5rem;
  }
  .nav a {
    font-size: 0.7rem;
  }
}

/* ============================================
   Hero
   ============================================ */

.hero {
  position: relative;
  z-index: 1;
  min-height: 85vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-illustration {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-illustration::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 70% 60% at 70% 50%, rgba(0, 212, 255, 0.06), transparent 50%),
    radial-gradient(ellipse 50% 80% at 30% 60%, rgba(0, 255, 178, 0.03), transparent 50%);
}

.hero-illustration img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0%, rgba(11, 15, 25, 0.2) 30%, rgba(11, 15, 25, 0.4) 55%, rgba(11, 15, 25, 0.85) 100%),
    linear-gradient(180deg, rgba(11, 15, 25, 0.6) 0%, transparent 30%, transparent 70%, rgba(11, 15, 25, 0.8) 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(calc(3rem - 2cm), calc(6vw - 2cm), calc(5rem - 2cm)) 1.5rem;
}

.hero-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: max(1rem, calc(clamp(2rem, 5vw, 4rem) - 2.5cm));
  width: 100%;
}

.hero-content {
  flex: 1;
  min-width: 0;
  max-width: 520px;
}

.hero-content--right {
  margin-left: auto;
}

.hero-content--left {
  margin-right: 0;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.hero-title-secondary {
  color: var(--accent-cyan-bright);
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin: 0 0 1rem;
  line-height: 1.6;
}

.hero-concept {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  margin: 0 0 2rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-cta .btn {
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .hero-layout {
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
  }
  .hero-pipeline--compact {
    width: 100%;
    display: flex;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .hero {
    min-height: 70vh;
  }
  .hero-content--right,
  .hero-content--left {
    margin-left: 0;
    margin-right: 0;
  }
  .hero-cta {
    flex-direction: column;
  }
  .hero-cta .btn {
    text-align: center;
  }
  .hero-pipeline--compact .pipeline-flow {
    flex-direction: column;
  }
  .hero-pipeline--compact .pipeline-connector {
    width: 2px;
    height: 12px;
  }
}

/* Hero Pipeline — Compact (inside hero, no background) */
.hero-pipeline--compact {
  flex-shrink: 0;
  margin: 0;
  padding: 0;
  background: none;
  border: none;
}

.hero-pipeline--compact::before {
  display: none;
}

.hero-pipeline--compact .pipeline-flow {
  flex-direction: column;
}

.hero-pipeline--compact .pipeline-node {
  padding: 0.4rem 1rem;
  min-width: 140px;
}

.hero-pipeline--compact .pipeline-node-label {
  font-size: 0.7rem;
}

.hero-pipeline--compact .pipeline-connector {
  height: 12px;
}

/* Hero Pipeline — stand-alone (if used elsewhere) */
.hero-pipeline {
  margin: 3rem 0;
  padding: 2.5rem;
  background: linear-gradient(180deg, rgba(14, 22, 40, 0.9) 0%, rgba(11, 15, 25, 0.95) 100%);
  border: 1px solid rgba(0, 212, 255, 0.12);
  position: relative;
  overflow: hidden;
}

.hero-pipeline:not(.hero-pipeline--compact)::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0, 212, 255, 0.02) 2px,
      rgba(0, 212, 255, 0.02) 4px
    );
  pointer-events: none;
}

.pipeline-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.pipeline-node {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  min-width: 220px;
  background: rgba(0, 212, 255, 0.04);
  border: 1px solid rgba(0, 212, 255, 0.2);
  z-index: 1;
}

.pipeline-node-glow {
  position: absolute;
  inset: -1px;
  opacity: 0;
  background: radial-gradient(circle at center, rgba(0, 212, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.pipeline-node:hover .pipeline-node-glow {
  opacity: 1;
}

.pipeline-node--entry {
  border-color: rgba(0, 212, 255, 0.25);
  background: rgba(0, 212, 255, 0.06);
}

.pipeline-node--entry .pipeline-node-glow {
  background: radial-gradient(circle at center, rgba(0, 212, 255, 0.12) 0%, transparent 70%);
}

.pipeline-node--gate {
  border-color: rgba(0, 212, 255, 0.15);
}

.pipeline-node--authorized {
  border-color: rgba(0, 255, 178, 0.25);
  background: rgba(0, 255, 178, 0.06);
}

.pipeline-node--authorized .pipeline-node-glow {
  background: radial-gradient(circle at center, rgba(0, 255, 178, 0.12) 0%, transparent 70%);
}

.pipeline-node--artifact {
  border-color: rgba(0, 255, 178, 0.3);
  background: rgba(0, 255, 178, 0.08);
}

.pipeline-node--artifact .pipeline-node-label {
  color: var(--accent-green);
}

.pipeline-node-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.pipeline-connector {
  position: relative;
  width: 2px;
  height: 24px;
  display: flex;
  justify-content: center;
  overflow: hidden;
}

.pipeline-connector-stream {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, 
    transparent 0%, 
    var(--accent-cyan) 20%, 
    var(--accent-cyan) 80%, 
    transparent 100%);
  opacity: 0.5;
  animation: pipeline-flow 2s ease-in-out infinite;
}

@keyframes pipeline-flow {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}

/* Digital flow effect — slow continuous energy through pipeline */
.pipeline-connector-stream.pipeline-connector-flow {
  animation: digital-flow 3.5s ease-in-out infinite;
}

.protocol-pipeline-connector-line.protocol-pipeline-connector-flow {
  animation: digital-flow 4s ease-in-out infinite;
}

@keyframes digital-flow {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 0.65; }
}

/* Hero CTAs */
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

.btn {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-decoration: none;
  padding: 0.85rem 1.5rem;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.btn--primary {
  background: transparent;
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
}

.btn--primary:hover {
  background: rgba(0, 212, 255, 0.08);
}

.btn--secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.btn--secondary:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

@media (max-width: 480px) {
  .hero-pipeline {
    padding: 1.5rem;
  }
  .pipeline-node {
    min-width: 180px;
    padding: 0.85rem 1.5rem;
  }
  .pipeline-node-label {
    font-size: 0.75rem;
  }
  .hero-cta {
    flex-direction: column;
  }
  .btn {
    text-align: center;
  }
}

/* ============================================
   Sections
   ============================================ */

.section {
  position: relative;
  z-index: 1;
  padding: var(--section-pad) 0;
}

/* Viewport-based sections */
.section--viewport {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-sizing: border-box;
}

.section-end {
  margin-top: auto;
  padding-top: clamp(2rem, 5vw, 4rem);
  text-align: center;
}

.scroll-indicator {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0.8;
}

.section-end::before {
  content: '';
  display: block;
  width: 80px;
  height: 1px;
  margin: 0 auto 1rem;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.4), transparent);
}

.section-end--final::before {
  display: none;
}

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 20;
  width: 48px;
  height: 48px;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent-cyan);
  cursor: pointer;
  transition: opacity 0.3s, transform 0.2s, box-shadow 0.2s;
}

.back-to-top:hover {
  background: rgba(0, 212, 255, 0.12);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.2);
}

.back-to-top.is-visible {
  display: flex;
}

.section--structural-problem .container {
  max-width: 720px;
}

.section--structural-problem .body-text {
  font-size: 1.26rem;
}

.hdr-download-cta {
  margin-top: 1.5rem;
}

.section--dark {
  background: var(--bg-mid);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 2rem;
  letter-spacing: -0.01em;
}

/* Why Decision Verification Matters */
.section--why-verification .container {
  max-width: 840px;
}

.why-layout {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.why-content {
  flex: 0 1 380px;
  min-width: 0;
}

.section--why-verification .section-title {
  margin-bottom: 0.75rem;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
}

.why-narrative {
  margin: 0;
}

.why-lead {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin: 0 0 0.35rem;
}

.why-context {
  margin: 0.5rem 0 0.25rem;
  font-size: 0.9rem;
}

.why-tasks {
  margin: 0 0 0.5rem;
  padding-left: 1.25rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.why-tasks li {
  margin-bottom: 0.15rem;
}

.why-problem {
  margin: 0;
  font-size: 0.9rem;
}

/* 2x2 grid of containers */
.why-containers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  flex: 0 0 360px;
  min-width: 0;
}

.why-model-block,
.why-comparison-box {
  padding: 0.85rem 1rem;
  border: 1px solid rgba(0, 212, 255, 0.1);
  background: rgba(11, 15, 25, 0.4);
  min-width: 0;
}

.why-model-block--verified {
  border-color: rgba(0, 255, 178, 0.2);
  background: rgba(0, 255, 178, 0.03);
}

.why-comparison-box--unverified {
  border-color: rgba(139, 153, 176, 0.2);
}

.why-comparison-box--verified {
  border-color: rgba(0, 212, 255, 0.2);
}

.why-model-title,
.why-comparison-title {
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 0.6rem;
}

.why-model-block--verified .why-model-title,
.why-comparison-box--verified .why-comparison-title {
  color: var(--accent-green);
}

.why-model-flow {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.why-model-step {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.why-model-step--accent {
  color: var(--accent-cyan);
}

.why-model-arrow {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.why-model-block--verified .why-model-arrow {
  color: rgba(0, 212, 255, 0.6);
}

.why-model-problem {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin: 0.5rem 0 0;
  line-height: 1.4;
}

.why-comparison-flow {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.why-comparison-box--verified .why-comparison-flow {
  color: var(--accent-cyan);
}

.why-key {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent-cyan);
  margin: 0;
}

@media (max-width: 880px) {
  .why-layout {
    flex-direction: column;
  }
  .why-content {
    flex: 1 1 auto;
  }
  .why-containers {
    flex: 1 1 auto;
    max-width: 100%;
  }
}

@media (max-width: 560px) {
  .why-containers {
    grid-template-columns: 1fr;
  }
}

/* Infrastructure Stack Diagram */
.section--stack {
  background: var(--bg-deep);
  margin-top: -5.5cm;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0;
}

.section--stack .container {
  max-width: calc(680px + 2cm);
  padding-left: 0.5rem;
  padding-right: 0.5rem;
}

.section-title--stack {
  margin-bottom: 1.25rem;
}

.stack-diagram {
  position: relative;
  padding: 1.25rem 2rem;
  background: linear-gradient(180deg, #0B0F19 0%, #0E1628 100%);
  border: 1px solid rgba(0, 212, 255, 0.1);
  overflow: hidden;
}

.stack-diagram-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
}

.stack-diagram-flow {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.stack-flow-line {
  width: 2px;
  height: 18px;
  background: linear-gradient(180deg,
    transparent 0%,
    rgba(0, 212, 255, 0.3) 20%,
    rgba(0, 212, 255, 0.5) 50%,
    rgba(0, 212, 255, 0.3) 80%,
    transparent 100%);
}

.stack-flow-line--4 {
  background: linear-gradient(180deg,
    transparent 0%,
    rgba(0, 255, 178, 0.25) 20%,
    rgba(0, 255, 178, 0.5) 50%,
    rgba(0, 255, 178, 0.25) 80%,
    transparent 100%);
}

.stack-layer {
  position: relative;
  width: 100%;
  max-width: calc(540px + 1.5cm);
  padding: 0.9rem 1.5rem;
  border: 1px solid rgba(0, 212, 255, 0.12);
  background: rgba(14, 22, 40, 0.7);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out, box-shadow 0.6s ease-out;
}

.stack-layer.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.stack-layer.stack-layer--heillon.is-visible {
  box-shadow: 0 0 48px rgba(0, 255, 178, 0.12), inset 0 0 60px rgba(0, 255, 178, 0.04);
}

.stack-flow-line {
  opacity: 0;
  transition: opacity 0.4s ease-out;
}

.stack-flow-line.is-visible {
  opacity: 1;
}

.stack-layer::before {
  content: '';
  position: absolute;
  inset: 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
  pointer-events: none;
}

.stack-layer-label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.stack-layer-desc {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  line-height: 1.4;
}

.stack-layer--heillon {
  border-color: rgba(0, 255, 178, 0.35);
  background: rgba(0, 255, 178, 0.06);
  box-shadow: 0 0 40px rgba(0, 255, 178, 0.08), inset 0 0 60px rgba(0, 255, 178, 0.03);
}

.stack-layer-glow {
  position: absolute;
  inset: -2px;
  border-radius: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 100%, rgba(0, 255, 178, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.stack-layer-label--heillon {
  color: var(--accent-green);
  font-size: 1rem;
}

.stack-layer-sublabel {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  margin-top: 0.15rem;
}

.stack-layer-concept {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-top: 0.6rem;
}

@media (max-width: 560px) {
  .stack-diagram {
    padding: 1.5rem;
  }
  .stack-layer {
    padding: 1rem 1.25rem;
  }
  .stack-layer-label {
    font-size: 0.9rem;
  }
  .stack-layer-desc {
    font-size: 0.75rem;
  }
}

/* Institutional Legitimacy */
.section--legitimacy {
  background: var(--bg-deep);
}

.section--legitimacy .container {
  max-width: 760px;
}

.legitimacy-intro {
  margin-bottom: 2rem;
}

.legitimacy-content {
  display: flex;
  align-items: stretch;
  gap: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.legitimacy-block {
  flex: 1;
  min-width: 220px;
  padding: 1.5rem;
  border: 1px solid rgba(0, 212, 255, 0.1);
  background: rgba(14, 22, 40, 0.5);
}

.legitimacy-block--traditional {
  border-color: rgba(139, 153, 176, 0.15);
}

.legitimacy-block--structural {
  border-color: rgba(0, 255, 178, 0.2);
  background: rgba(0, 255, 178, 0.04);
}

.legitimacy-block-title {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.legitimacy-block--structural .legitimacy-block-title {
  color: var(--accent-green);
}

.legitimacy-block-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

.legitimacy-block-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0.75rem 0 0;
}

.legitimacy-transition {
  display: flex;
  align-items: center;
}

.legitimacy-arrow {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  opacity: 0.7;
}

.legitimacy-core {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--accent-cyan);
  margin: 0 0 0.5rem;
}

.legitimacy-concept {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin: 0 0 2rem;
}

.legitimacy-visual {
  padding: 1.5rem;
  border: 1px solid rgba(0, 212, 255, 0.1);
  background: rgba(11, 15, 25, 0.6);
}

.legitimacy-visual-flow {
  display: flex;
  align-items: stretch;
  gap: 2rem;
  flex-wrap: wrap;
}

.legitimacy-visual-col {
  flex: 1;
  min-width: 180px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.legitimacy-visual-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.legitimacy-visual-sublabel {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.legitimacy-visual-bar {
  width: 100%;
  height: 4px;
  margin-top: 1rem;
}

.legitimacy-visual-bar--after {
  background: linear-gradient(90deg, var(--text-muted), transparent);
  opacity: 0.4;
}

.legitimacy-visual-bar--before {
  background: linear-gradient(90deg, var(--accent-green), transparent);
  opacity: 0.6;
}

.legitimacy-visual-divider {
  width: 1px;
  background: rgba(0, 212, 255, 0.2);
}

@media (max-width: 600px) {
  .legitimacy-content {
    flex-direction: column;
  }
  .legitimacy-transition {
    transform: rotate(90deg);
  }
  .legitimacy-visual-divider {
    width: 100%;
    height: 1px;
  }
}

/* HEILLON Protocol Section */
.section--protocol .container {
  max-width: 960px;
}

.protocol-layout {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.protocol-content {
  flex: 1;
  min-width: 0;
}

.section--protocol .section-title {
  margin-bottom: 1rem;
}

.protocol-intro {
  margin: 0;
  max-width: 42ch;
  font-size: 1rem;
}

.protocol-diagram-block {
  flex-shrink: 0;
  padding: 1rem 1.25rem;
  background: rgba(11, 15, 25, 0.5);
  border: 1px solid rgba(0, 212, 255, 0.1);
  position: relative;
}

.protocol-diagram-block::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 212, 255, 0.02) 2px,
    rgba(0, 212, 255, 0.02) 4px
  );
  pointer-events: none;
}

.protocol-pipeline {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  position: relative;
  z-index: 1;
}

.protocol-pipeline-node {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.4rem 1rem;
  min-width: 120px;
  background: rgba(0, 212, 255, 0.04);
  border: 1px solid rgba(0, 212, 255, 0.18);
}

.protocol-pipeline-node-glow {
  position: absolute;
  inset: -1px;
  opacity: 0;
  background: radial-gradient(circle at center, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.protocol-pipeline-node:hover .protocol-pipeline-node-glow {
  opacity: 1;
}

.protocol-pipeline-node--entry {
  border-color: rgba(0, 212, 255, 0.22);
  background: rgba(0, 212, 255, 0.05);
}

.protocol-pipeline-node--component {
  border-color: rgba(0, 212, 255, 0.15);
}

.protocol-pipeline-node--artifact {
  border-color: rgba(0, 255, 178, 0.22);
  background: rgba(0, 255, 178, 0.05);
}

.protocol-pipeline-node--artifact .protocol-pipeline-node-label {
  color: var(--accent-green);
}

.protocol-pipeline-node-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.protocol-pipeline-node-id {
  font-size: 0.6rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.protocol-pipeline-connector {
  width: 2px;
  height: 12px;
  display: flex;
  justify-content: center;
  overflow: hidden;
}

.protocol-pipeline-connector-line {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg,
    transparent 0%,
    var(--accent-cyan) 15%,
    var(--accent-cyan) 85%,
    transparent 100%);
  opacity: 0.4;
}

/* Protocol build animation — scroll-driven */
.protocol-pipeline-node {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.protocol-pipeline-node.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.protocol-pipeline-connector {
  opacity: 0;
  transition: opacity 0.5s ease-out 0.15s;
}

.protocol-pipeline-connector.is-visible {
  opacity: 1;
}

/* Protocol Component Descriptions — single row */
.protocol-components {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.protocol-component {
  padding: 1rem;
  border: 1px solid rgba(0, 212, 255, 0.08);
  background: rgba(11, 15, 25, 0.4);
  min-width: 0;
}

.protocol-component-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--accent-cyan);
  margin: 0 0 0.4rem;
}

.protocol-component-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.45;
}

@media (max-width: 900px) {
  .protocol-layout {
    flex-direction: column;
  }
  .protocol-components {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .protocol-components {
    grid-template-columns: 1fr;
  }
  .protocol-pipeline-node {
    min-width: 110px;
  }
}

.body-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin: 0;
  max-width: 40ch;
}

.body-text--lead {
  max-width: 56ch;
  font-size: 1.15rem;
  color: var(--text-primary);
  margin-bottom: 3rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  max-width: 720px;
}

@media (max-width: 640px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}

/* Infrastructure Nodes */
.infra-nodes {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.infra-node {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: rgba(0, 212, 255, 0.04);
  border: 1px solid rgba(0, 212, 255, 0.12);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.infra-node-icon {
  width: 24px;
  height: 24px;
  color: var(--accent-cyan);
}

.infra-node-icon svg {
  width: 100%;
  height: 100%;
}

/* Model Diagram */
.model-diagram {
  display: flex;
  align-items: flex-start;
  gap: 0;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: 900px;
}

.model-step {
  flex: 1;
  min-width: 180px;
  padding: 2rem;
  background: rgba(14, 22, 40, 0.8);
  border: 1px solid rgba(0, 212, 255, 0.1);
}

.model-step-num {
  display: block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
}

.model-step-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  display: block;
  margin-bottom: 0.5rem;
}

.model-step-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.model-arrow {
  display: flex;
  align-items: center;
  padding: 0 0.5rem;
  color: var(--accent-cyan);
  opacity: 0.5;
}

.model-arrow svg {
  width: 40px;
  height: 8px;
}

@media (max-width: 720px) {
  .model-diagram {
    flex-direction: column;
  }
  .model-arrow {
    transform: rotate(90deg);
    padding: 0.5rem 0;
  }
}

/* Infrastructure Architecture */
.section--architecture .container {
  max-width: 960px;
}

.architecture-layout {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.architecture-content {
  flex: 0 1 380px;
  min-width: 0;
}

.section--architecture .section-title {
  margin-bottom: 1rem;
}

.architecture-intro {
  margin: 0;
  max-width: 42ch;
  font-size: 1rem;
}

.section--architecture .architecture-diagram {
  flex: 1 1 420px;
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid rgba(0, 212, 255, 0.12);
  background: linear-gradient(180deg, rgba(14, 22, 40, 0.95) 0%, rgba(11, 15, 25, 0.98) 100%);
}

@media (max-width: 820px) {
  .architecture-layout {
    flex-direction: column;
    gap: 1.5rem;
  }
  .architecture-content {
    flex: 1 1 auto;
  }
  .section--architecture .architecture-diagram {
    flex: 1 1 auto;
  }
}

.architecture-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.architecture-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.25rem 2rem;
  min-width: 240px;
  border: 1px solid rgba(0, 212, 255, 0.15);
  background: rgba(0, 212, 255, 0.03);
}

.architecture-node--entry {
  border-color: rgba(0, 212, 255, 0.22);
  background: rgba(0, 212, 255, 0.05);
}

.architecture-node--component {
  border-color: rgba(0, 212, 255, 0.12);
}

.architecture-node--output {
  border-color: rgba(0, 255, 178, 0.22);
  background: rgba(0, 255, 178, 0.05);
}

.architecture-node-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text-primary);
}

.architecture-node--output .architecture-node-label {
  color: var(--accent-green);
}

.architecture-node-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  text-align: center;
  max-width: 200px;
}

.architecture-connector {
  width: 2px;
  height: 20px;
  background: linear-gradient(180deg,
    transparent 0%,
    var(--accent-cyan) 30%,
    var(--accent-cyan) 70%,
    transparent 100%);
  opacity: 0.5;
}

@media (max-width: 560px) {
  .architecture-node {
    min-width: 200px;
  }
}

/* Component Overview — split from Architecture */
.section--component-overview .container {
  max-width: 880px;
}

.component-intro {
  margin-bottom: 2rem;
}

.component-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.component-card {
  padding: 1.25rem;
  border: 1px solid rgba(0, 212, 255, 0.08);
  background: rgba(11, 15, 25, 0.5);
}

.component-card-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-cyan);
  margin: 0 0 0.5rem;
}

.component-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

@media (max-width: 560px) {
  .component-cards {
    grid-template-columns: 1fr;
  }
}

/* HDR Artifact — HEILLON Decision Record */
.section--hdr-artifact {
  background: var(--bg-deep);
}

.section--hdr-artifact .container {
  max-width: 920px;
}

.hdr-layout {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.hdr-content {
  flex: 0 1 340px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.section--hdr-artifact .section-title {
  margin-bottom: 0;
}

.hdr-intro {
  margin: 0;
  max-width: 38ch;
  font-size: 1rem;
}

.hdr-download-cta {
  margin-top: 0.5rem;
  padding: 0.75rem 1rem;
  border: 1px solid rgba(0, 212, 255, 0.12);
  background: rgba(11, 15, 25, 0.5);
  align-self: flex-start;
}

.hdr-download-cta .btn {
  display: inline-block;
  padding: 0.5rem 0.9rem;
  font-size: 0.8rem;
}

.hdr-artifact-block {
  flex: 1 1 420px;
  min-width: 0;
  align-self: stretch;
}

@media (max-width: 820px) {
  .hdr-layout {
    flex-direction: column;
    gap: 1.5rem;
  }
  .hdr-content {
    flex: 1 1 auto;
  }
  .hdr-artifact-block {
    flex: 1 1 auto;
  }
}

.hdr-artifact-block {
  position: relative;
  padding: 1px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15) 0%, transparent 40%, transparent 60%, rgba(0, 255, 178, 0.1) 100%);
  box-shadow: 0 0 60px rgba(0, 255, 178, 0.04);
  overflow: hidden;
}

.hdr-artifact-pattern {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 1px,
      rgba(0, 212, 255, 0.02) 1px,
      rgba(0, 212, 255, 0.02) 2px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 1px,
      rgba(0, 212, 255, 0.02) 1px,
      rgba(0, 212, 255, 0.02) 2px
    );
  background-size: 8px 8px;
  opacity: 0.8;
}

.hdr-artifact-inner {
  position: relative;
  background: linear-gradient(180deg, #0B0F19 0%, #0E1628 100%);
  padding: 1.5rem 1.75rem;
  border: 1px solid rgba(0, 212, 255, 0.08);
}

.hdr-artifact-inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  border-left: 1px solid rgba(0, 212, 255, 0.2);
  border-top: 1px solid rgba(0, 212, 255, 0.2);
  pointer-events: none;
}

.hdr-artifact-inner::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 20px;
  height: 20px;
  border-right: 1px solid rgba(0, 255, 178, 0.2);
  border-bottom: 1px solid rgba(0, 255, 178, 0.2);
  pointer-events: none;
}

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

.hdr-artifact-id {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
}

.hdr-artifact-badge {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--accent-green);
  padding: 0.25rem 0.5rem;
  border: 1px solid rgba(0, 255, 178, 0.3);
  background: rgba(0, 255, 178, 0.06);
}

.hdr-artifact-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.2), transparent);
  margin: 1rem 0;
}

.hdr-artifact-fields {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.hdr-artifact-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.75rem;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.hdr-artifact-row.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hdr-artifact-badge {
  opacity: 0;
  transition: opacity 0.6s ease-out;
}

.hdr-artifact-badge.is-visible {
  opacity: 1;
}

.hdr-artifact-key {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.hdr-artifact-dots {
  flex-shrink: 0;
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.65rem;
  color: rgba(0, 212, 255, 0.3);
  letter-spacing: 0.1em;
  min-width: 60px;
  overflow: hidden;
}

.hdr-artifact-dots::before {
  content: '· · · · · · · · · ·';
}

.hdr-artifact-value {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.8rem;
  color: var(--text-primary);
  text-align: right;
}

.hdr-artifact-value--outcome {
  color: var(--accent-green);
  font-weight: 600;
}

.hdr-artifact-value--sig {
  color: var(--accent-cyan);
  font-size: 0.75rem;
}

.hdr-artifact-footer {
  margin-top: 1rem;
  padding-top: 0.75rem;
}

.hdr-artifact-issued {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Institutional Use Case */
.section--use-case {
  margin-top: -1.5cm;
}

.section--use-case .container {
  max-width: 920px;
}

.section--use-case .section-title {
  margin-bottom: 0.5rem;
}

.use-case-scenario {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 0.04em;
  margin: 0 0 1rem;
}

.use-case-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.use-case-block {
  padding: 1rem 1.25rem;
  min-height: 2.5cm;
  border: 1px solid rgba(0, 212, 255, 0.1);
  background: rgba(11, 15, 25, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.use-case-block-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.use-case-process {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.use-case-process-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.use-case-steps {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 0;
  width: 100%;
}

.use-case-step {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  flex: 1 1 0;
  min-width: 0;
  background: rgba(0, 212, 255, 0.04);
  border: 1px solid rgba(0, 212, 255, 0.12);
  text-align: center;
}

.use-case-step-num {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  min-width: 1.5rem;
}

.use-case-step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
}

.use-case-flow-arrow {
  width: 24px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), transparent);
  opacity: 0.6;
}

.use-case-benefit {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--accent-green);
  margin: 0 0 1rem;
  text-align: center;
}

.use-case-diagram {
  padding: 0;
  border: none;
  background: none;
  display: flex;
  justify-content: center;
}

.use-case-diagram-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: nowrap;
  gap: 0;
}

.use-case-diagram-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.6rem 1rem;
  min-width: fit-content;
  white-space: nowrap;
  border: 1px solid rgba(0, 212, 255, 0.12);
  background: rgba(0, 212, 255, 0.03);
}

.use-case-diagram-node--heillon {
  border-color: rgba(0, 255, 178, 0.25);
  background: rgba(0, 255, 178, 0.05);
}

.use-case-diagram-node--output {
  border-color: rgba(0, 255, 178, 0.2);
}

.use-case-diagram-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-primary);
}

.use-case-diagram-node--heillon .use-case-diagram-label {
  color: var(--accent-green);
}

.use-case-diagram-sublabel {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.use-case-diagram-connector {
  width: 20px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.5;
}

@media (max-width: 720px) {
  .use-case-content {
    grid-template-columns: 1fr;
  }
  .use-case-steps {
    flex-direction: column;
  }
  .use-case-flow-arrow {
    width: 2px;
    height: 16px;
    background: linear-gradient(180deg, var(--accent-cyan), transparent);
  }
  .use-case-diagram-flow {
    flex-direction: column;
  }
  .use-case-diagram-connector {
    width: 2px;
    height: 20px;
    background: linear-gradient(180deg, transparent, var(--accent-cyan), transparent);
  }
}

/* Interactive Demonstration — fits in one viewport */
.section--demo {
  margin-top: -4cm;
}

.section--demo .container {
  max-width: calc(900px + 1.8cm);
}

.section--demo .container:has(.demo-layout--with-result) {
  max-width: calc(1008px + 1.8cm);
}

.section--demo .section-title {
  margin-bottom: 0.6rem;
  line-height: 1.2;
}

.section--demo .section-end {
  padding-top: 1.5rem;
}

.demo-intro {
  margin-bottom: 0;
  line-height: 1.35;
  color: var(--text-secondary);
  white-space: nowrap;
  max-width: none;
}

/* Demo stage — unified container (90% scale) */
.demo-stage {
  position: relative;
  padding: 0.9rem 1.35rem;
  background: linear-gradient(180deg, rgba(11, 15, 25, 0.95) 0%, rgba(14, 22, 40, 0.9) 100%);
  border: 1px solid rgba(0, 212, 255, 0.08);
  overflow: hidden;
}

.demo-stage::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 212, 255, 0.015) 2px,
    rgba(0, 212, 255, 0.015) 4px
  );
  pointer-events: none;
}

.demo-stage > * {
  position: relative;
  z-index: 1;
}

.demo-layout {
  display: grid;
  grid-template-columns: 234px 1fr;
  gap: 1.35rem;
  align-items: start;
  min-height: 0;
  transition: grid-template-columns 0.45s ease-out, gap 0.45s ease-out;
}

.demo-layout--with-result {
  grid-template-columns: 225px 1fr 234px;
  align-items: start;
  gap: 1.125rem;
}

.demo-input-panel,
.demo-pipeline-panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.demo-pipeline-panel {
  overflow: auto;
  min-width: 0;
}

.demo-layout--with-result .demo-pipeline-panel {
  overflow: visible;
}

.demo-layout--with-result .demo-pipeline {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.demo-pipeline {
  flex-shrink: 0;
}

.demo-input-panel,
.demo-pipeline-panel {
  padding: 0.9rem 1.125rem;
  background: rgba(11, 15, 25, 0.4);
  border: 1px solid rgba(0, 212, 255, 0.1);
  border-radius: 2px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.demo-input-panel {
  border-left: 2px solid rgba(0, 212, 255, 0.25);
}

.demo-pipeline-panel {
  border-left: 2px solid rgba(0, 212, 255, 0.1);
}

.demo-panel-title {
  font-family: var(--font-display);
  font-size: 0.63rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(0, 212, 255, 0.08);
}

.demo-form {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.demo-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.demo-field label {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.demo-field input,
.demo-field select {
  font-family: var(--font-body);
  font-size: 0.81rem;
  padding: 0.6rem 0.7rem;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(0, 212, 255, 0.12);
  color: var(--text-primary);
  min-width: 0;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.demo-field input:focus,
.demo-field select:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.1);
}

.demo-field input::placeholder {
  color: var(--text-muted);
}

.demo-field select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238B99B0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.btn--submit {
  margin-top: 0.5rem;
  cursor: pointer;
  transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.btn--submit:hover:not(:disabled) {
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.15);
}

.btn--submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--submit:not(:disabled):active {
  transform: scale(0.98);
}

.demo-pipeline {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  position: relative;
}

.demo-pipeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg,
    transparent 0%,
    rgba(0, 212, 255, 0.06) 20%,
    rgba(0, 212, 255, 0.12) 50%,
    rgba(0, 212, 255, 0.06) 80%,
    transparent 100%);
  transform: translateX(-50%);
  z-index: 0;
  pointer-events: none;
}

.demo-pipeline > * {
  position: relative;
  z-index: 1;
}

.demo-pipeline-step {
  width: 135px;
  min-height: 29px;
  padding: 0.36rem 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: rgba(11, 15, 25, 0.6);
  border: 1px solid rgba(0, 212, 255, 0.12);
  transition: border-color 0.35s ease-out, background 0.35s ease-out, box-shadow 0.35s ease-out;
  box-sizing: border-box;
  border-radius: 2px;
}

.demo-pipeline-step-label {
  font-family: var(--font-display);
  font-size: 0.63rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  line-height: 1.25;
  word-break: break-word;
}

.demo-pipeline-step.demo-pipeline-step--active {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.06);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.08);
}

.demo-pipeline-step.demo-pipeline-step--active .demo-pipeline-step-label {
  color: var(--accent-cyan);
}

.demo-pipeline-step.demo-pipeline-step--complete {
  border-color: rgba(0, 255, 178, 0.25);
  background: rgba(0, 255, 178, 0.03);
}

.demo-pipeline-step.demo-pipeline-step--complete .demo-pipeline-step-label {
  color: var(--accent-green);
}

.demo-pipeline-step.demo-pipeline-step--artifact.demo-pipeline-step--complete {
  border-color: rgba(0, 255, 178, 0.35);
  background: rgba(0, 255, 178, 0.06);
}

@keyframes demo-step-pulse {
  0%, 100% { box-shadow: 0 0 16px rgba(0, 212, 255, 0.08); }
  50% { box-shadow: 0 0 24px rgba(0, 212, 255, 0.12); }
}

.demo-pipeline-step--processing {
  animation: demo-step-pulse 1.2s ease-in-out infinite;
}

.demo-pipeline-step.demo-pipeline-step--error {
  border-color: rgba(255, 100, 100, 0.4);
  background: rgba(255, 100, 100, 0.06);
}

.demo-pipeline-step.demo-pipeline-step--error .demo-pipeline-step-label {
  color: #ff8a8a;
}

.demo-pipeline-step.demo-pipeline-step--outcome.demo-pipeline-step--authorized .demo-pipeline-outcome-text {
  color: var(--accent-green);
}

.demo-pipeline-step.demo-pipeline-step--outcome.demo-pipeline-step--denied .demo-pipeline-outcome-text {
  color: #ff8a8a;
}

.demo-pipeline-step.demo-pipeline-step--outcome.demo-pipeline-step--pending .demo-pipeline-outcome-text {
  color: #ffd54f;
}

.demo-pipeline-connector {
  width: 2px;
  height: 7px;
  background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.15), transparent);
  opacity: 0.6;
  transition: background 0.3s, opacity 0.3s;
}

.demo-pipeline-step.demo-pipeline-step--active + .demo-pipeline-connector,
.demo-pipeline-step.demo-pipeline-step--complete + .demo-pipeline-connector {
  background: linear-gradient(180deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.85;
}

.demo-result-panel {
  position: relative;
  padding: 0.9rem 1rem;
  background: rgba(11, 15, 25, 0.5);
  border: 1px solid rgba(0, 255, 178, 0.15);
  border-left: 2px solid rgba(0, 255, 178, 0.3);
  min-width: 0;
  opacity: 0;
  transform: translateX(12px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
  border-radius: 2px;
}

.demo-result-panel.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.demo-result-panel::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 12px;
  height: 12px;
  border-top: 1px solid rgba(0, 255, 178, 0.2);
  border-right: 1px solid rgba(0, 255, 178, 0.2);
  pointer-events: none;
}

.demo-result-title {
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin: 0 0 0.85rem;
}

.demo-result-hdr {
  margin-bottom: 0;
}

.demo-hdr-display {
  font-family: 'IBM Plex Mono', 'Menlo', 'Consolas', monospace;
}

.demo-result-panel .demo-hdr-id {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  margin-bottom: 0.6rem;
}

.demo-result-panel .demo-hdr-row {
  font-size: 0.7rem;
}

.demo-hdr-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  margin-bottom: 0.4rem;
}

.demo-hdr-key {
  color: var(--text-muted);
}

.demo-hdr-dots {
  min-width: 40px;
  font-size: 0.6rem;
  color: rgba(0, 212, 255, 0.3);
}

.demo-hdr-dots::before {
  content: '· · · · ·';
}

.demo-hdr-value {
  color: var(--text-primary);
  text-align: right;
}

.demo-hdr-value--outcome {
  color: var(--accent-green);
  font-weight: 600;
}

.demo-hdr-value--sig {
  color: var(--accent-cyan);
}

.demo-actions-row {
  display: none;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0, 212, 255, 0.08);
}

.demo-stage:has(.demo-layout--with-result) .demo-actions-row {
  display: flex;
}

.btn--sm {
  font-size: 0.8rem;
  padding: 0.6rem 1rem;
}

@media (max-width: 900px) {
  .demo-layout--with-result {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 800px) {
  .demo-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .demo-intro {
    white-space: normal;
  }
}

/* Developer Entry */
.section--developers {
  background: var(--bg-deep);
  padding: clamp(1.5rem, 4vw, 2.5rem) 0;
  margin-top: -2cm;
}

.section--developers .container {
  max-width: 820px;
  padding-left: 0.5rem;
  padding-right: 0.5rem;
}

.section--developers .section-title {
  margin-bottom: 0.6rem;
}

.dev-intro {
  margin-bottom: 1rem;
}

.dev-resources {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: 1.25rem;
}

.dev-resource {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border: 1px solid rgba(0, 212, 255, 0.2);
  background: rgba(0, 212, 255, 0.04);
}

.dev-api {
  padding: 1rem 1.25rem;
  border: 1px solid rgba(0, 212, 255, 0.12);
  background: rgba(11, 15, 25, 0.8);
  margin-bottom: 1rem;
}

.dev-endpoint {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.dev-endpoint-method {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-green);
  letter-spacing: 0.05em;
}

.dev-endpoint-path {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.9rem;
  color: var(--accent-cyan);
}

.dev-code-blocks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.dev-code-block {
  border: 1px solid rgba(0, 212, 255, 0.08);
  background: rgba(0, 0, 0, 0.3);
}

.dev-code-title {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid rgba(0, 212, 255, 0.08);
}

.dev-code-content {
  margin: 0;
  padding: 0.75rem 0.6rem;
  overflow-x: auto;
}

.dev-code-content code {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.7rem;
  line-height: 1.5;
  color: var(--text-secondary);
  white-space: pre;
}

.dev-cta {
  margin-top: 0;
  margin-bottom: 0;
}

.section--developers .section-end {
  padding-top: 1rem;
}

@media (max-width: 640px) {
  .dev-code-blocks {
    grid-template-columns: 1fr;
  }
}

/* Live Decision Stream */
.section--live-stream .container {
  max-width: 960px;
}

.live-stream-layout {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.live-stream-content {
  flex: 0 1 380px;
  min-width: 0;
}

.live-stream-subtitle {
  margin: 0 0 1rem;
}

.live-stream-text {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 42ch;
}

.live-stream-panel {
  flex: 1 1 420px;
  min-width: 0;
  padding: 1.5rem;
  background: linear-gradient(180deg, rgba(11, 15, 25, 0.95) 0%, rgba(14, 22, 40, 0.9) 100%);
  border: 1px solid rgba(0, 212, 255, 0.1);
  position: relative;
  overflow: hidden;
}

.live-stream-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0, 212, 255, 0.015) 2px, rgba(0, 212, 255, 0.015) 4px);
  pointer-events: none;
}

.live-stream-counter {
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(0, 212, 255, 0.08);
}

.live-stream-counter-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.live-stream-counter-value {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.02em;
}

.live-stream-log {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.live-stream-entry {
  font-family: 'IBM Plex Mono', 'Menlo', monospace;
  font-size: 0.8rem;
  padding: 0.5rem 0.75rem;
  opacity: 0;
  transform: translateY(4px);
  border-left: 2px solid transparent;
  background: rgba(0, 0, 0, 0.2);
  transition: opacity 1s ease-out, transform 1s ease-out;
}

.section--live-stream.is-visible .live-stream-entry {
  opacity: 1;
  transform: translateY(0);
}

.section--live-stream.is-visible .live-stream-entry:nth-child(1) { transition-delay: 0.3s; }
.section--live-stream.is-visible .live-stream-entry:nth-child(2) { transition-delay: 0.7s; }
.section--live-stream.is-visible .live-stream-entry:nth-child(3) { transition-delay: 1.1s; }
.section--live-stream.is-visible .live-stream-entry:nth-child(4) { transition-delay: 1.5s; }

.live-stream-entry--authorized {
  border-left-color: rgba(0, 255, 178, 0.4);
  color: var(--text-primary);
}

.live-stream-entry--denied {
  border-left-color: rgba(255, 120, 120, 0.4);
  color: var(--text-secondary);
}

@media (max-width: 820px) {
  .live-stream-layout {
    flex-direction: column;
  }
}

/* HEILLON Protocol Paper */
.section--protocol-paper .container {
  max-width: 960px;
}

.protocol-paper-layout {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.protocol-paper-content {
  flex: 0 1 380px;
  min-width: 0;
}

.protocol-paper-subtitle {
  margin: 0 0 1rem;
}

.protocol-paper-text {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 42ch;
}

.protocol-paper-card {
  flex: 1 1 400px;
  min-width: 0;
  padding: 2rem;
  background: linear-gradient(180deg, rgba(14, 22, 40, 0.9) 0%, rgba(11, 15, 25, 0.95) 100%);
  border: 1px solid rgba(0, 212, 255, 0.12);
  position: relative;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.protocol-paper-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.protocol-paper-card-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.25rem;
}

.protocol-paper-card-version {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0 0 1.25rem;
}

.protocol-paper-sections {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.protocol-paper-sections li::before {
  content: '•';
  color: var(--accent-cyan);
  margin-right: 0.5rem;
}

.protocol-paper-download {
  display: inline-block;
  margin-bottom: 0.75rem;
}

.protocol-paper-caption {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin: 0;
}

@media (max-width: 820px) {
  .protocol-paper-layout {
    flex-direction: column;
  }
}

/* Founder */
.section--founder {
  background: var(--bg-deep);
}

.section--founder .container {
  max-width: 640px;
  text-align: center;
}

.founder-title {
  margin-bottom: 1.5rem;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.founder-card {
  padding: 2rem 1.5rem;
  border: 1px solid rgba(0, 212, 255, 0.08);
  background: rgba(11, 15, 25, 0.5);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.founder-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.founder-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.35rem;
}

.founder-role {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  letter-spacing: 0.06em;
  margin: 0 0 1rem;
}

.founder-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0 0 1rem;
}

.founder-links {
  font-size: 0.8rem;
}

.founder-link {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: opacity 0.2s;
}

.founder-link:hover {
  opacity: 0.8;
}

.founder-link-sep {
  color: var(--text-muted);
  margin: 0 0.5rem;
}

/* Final Infrastructure Statement */
.section--closing {
  border-top: 1px solid rgba(0, 212, 255, 0.1);
  background: var(--bg-mid);
}

.section--closing .container {
  max-width: 720px;
}

.closing-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin: 0 0 2rem;
}

.closing-narrative {
  margin-bottom: 2rem;
}

.closing-narrative p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin: 0 0 0.75rem;
  line-height: 1.6;
}

.closing-authority {
  font-weight: 500;
  color: var(--text-primary) !important;
  margin-top: 1rem !important;
}

.closing-infra {
  font-weight: 600;
  color: var(--accent-cyan) !important;
}

.closing-concept {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  margin: 0 0 1.5rem;
}

.closing-message {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--accent-green);
  margin: 0 0 2.5rem;
}

.closing-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.closing-ctas .btn {
  flex-shrink: 0;
}

@media (max-width: 520px) {
  .closing-ctas {
    flex-direction: column;
  }
  .closing-ctas .btn {
    text-align: center;
  }
}

/* ============================================
   Footer
   ============================================ */

.footer {
  position: relative;
  z-index: 1;
  padding: 2rem 0;
  border-top: 1px solid rgba(0, 212, 255, 0.08);
}

.footer-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

/* Reduced motion — disable scroll-driven animations */
@media (prefers-reduced-motion: reduce) {
  .protocol-pipeline-node,
  .protocol-pipeline-connector,
  .hdr-artifact-row,
  .hdr-artifact-badge,
  .stack-layer,
  .stack-flow-line,
  .demo-result-panel {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .protocol-pipeline-node,
  .protocol-pipeline-connector {
    transition: none;
  }
  .hdr-stream-card {
    animation: none;
    opacity: 0.15;
  }
  .pipeline-connector-flow,
  .protocol-pipeline-connector-flow {
    animation: none;
    opacity: 0.5;
  }
}