/* Extensible Software — Visual Essay styles */

:root {
  --bg: #0f1115;
  --bg-2: #151921;
  --bg-3: #1c202b;
  --surface: #21263a;
  --surface-2: #2a3048;
  --text: #e8eaf2;
  --text-2: #a8adc4;
  --text-3: #767f9c;
  --accent: #ff7b44;
  --accent-2: #2bd4c5;
  --accent-3: #8b7aff;
  --warning: #ff4d6d;
  --ok: #4ade80;
  --warning-bg: rgba(255, 77, 109, 0.12);
  --ok-bg: rgba(74, 222, 128, 0.12);
  --border: rgba(255, 255, 255, 0.08);
  --radius: 16px;
  --radius-sm: 8px;
  --max-width: 980px;
  --header-height: 56px;
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  --transition: 0.25s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover, a:focus {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 200;
  background: var(--bg);
  color: var(--text);
  padding: 8px 16px;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

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

.wrap {
  width: min(92%, var(--max-width));
  margin-inline: auto;
}

.wrap.narrow {
  max-width: 720px;
}

/* Header & nav */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 17, 21, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  width: min(96%, var(--max-width));
  margin-inline: auto;
}

.logo {
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  font-size: 1.05rem;
}

.section-nav {
  display: flex;
  gap: 6px;
  font-size: 0.85rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.section-nav::-webkit-scrollbar {
  display: none;
}

.section-nav a {
  color: var(--text-2);
  padding: 6px 10px;
  border-radius: 999px;
  white-space: nowrap;
  transition: var(--transition);
}

.section-nav a:hover,
.section-nav a:focus,
.section-nav a.active {
  color: var(--text);
  background: var(--surface);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}

.nav-burger {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  position: relative;
  transition: var(--transition);
}

.nav-burger::before,
.nav-burger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
}

.nav-burger::before { top: -7px; }
.nav-burger::after { top: 7px; }

.reading-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--surface);
}

#progress-bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.1s linear;
}

/* Hero */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: calc(var(--header-height) + 40px) 24px 80px;
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(139, 122, 255, 0.18), transparent 35%),
    radial-gradient(circle at 80% 70%, rgba(43, 212, 197, 0.12), transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(255, 123, 68, 0.08), transparent 45%);
  pointer-events: none;
  animation: slowPulse 16s ease-in-out infinite;
}

@keyframes slowPulse {
  0%, 100% { opacity: 0.8; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 820px;
}

.kicker {
  color: var(--accent-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  margin-block: 0 16px;
}

h1 {
  font-size: clamp(2.6rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0 0 24px;
}

.line-break {
  display: block;
  color: var(--accent-2);
}

.lede {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--text-2);
  max-width: 640px;
  margin-inline: auto;
  margin-block: 0 16px;
  line-height: 1.6;
}

.byline {
  color: var(--text-3);
  font-size: 0.95rem;
  margin-block: 0 32px;
}

.disclosure {
  color: var(--text-3);
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.cta, .cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
}

.cta {
  background: var(--accent);
  color: #fff;
}

.cta:hover, .cta:focus {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.cta-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.cta-secondary:hover, .cta-secondary:focus {
  background: var(--surface);
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 40px;
  border: 2px solid var(--text-3);
  border-radius: 12px;
  opacity: 0.5;
}

.hero-scroll span {
  display: block;
  width: 4px;
  height: 8px;
  background: var(--text-3);
  border-radius: 2px;
  margin: 8px auto 0;
  animation: scrollBounce 1.6s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(8px); opacity: 0.5; }
}

/* Chapters */

.chapter {
  position: relative;
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.chapter-dark {
  background: var(--bg-2);
}

.chapter-highlight {
  background:
    linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 100%);
}

.section-intro {
  margin-bottom: 40px;
  max-width: 760px;
}

.section-number {
  display: inline-block;
  width: 40px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  border-radius: 50%;
  background: var(--surface);
  color: var(--accent-2);
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 16px;
}

.section-intro h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 16px;
}

.section-intro p {
  font-size: 1.05rem;
  color: var(--text-2);
  margin: 0;
}

.narrative {
  max-width: 680px;
  margin-top: 40px;
  font-size: 1.05rem;
}

.narrative p + p {
  margin-top: 1em;
}

.callout {
  border-left: 4px solid var(--accent);
  padding-left: 20px;
  margin: 28px 0;
  color: var(--text);
}

/* Diagrams general */

.diagram {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 24px 0;
  box-shadow: var(--shadow);
}

.diagram-caption {
  color: var(--text-3);
  font-size: 0.9rem;
  margin: 16px 0 0;
  text-align: center;
}

.diagram-title {
  font-size: 1.1rem;
  margin: 0 0 16px;
  color: var(--text);
}

/* Demand curve */

.diagram-demand {
  padding: 24px;
}

.demand-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.demand-controls label {
  color: var(--text-2);
  font-size: 0.95rem;
}

.demand-controls input[type="range"] {
  flex: 1 1 240px;
  max-width: 360px;
  accent-color: var(--accent-2);
}

.demand-viz {
  position: relative;
}

#demand-svg {
  width: 100%;
  height: auto;
  max-height: 340px;
  display: block;
}

.demand-legend {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--text-2);
}

.demand-legend span::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  margin-right: 6px;
  vertical-align: middle;
}

.legend-served::before { background: var(--accent-2); }
.legend-stranded::before { background: var(--accent); }
.legend-complexity::before { background: var(--warning); }

.demand-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.metric {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
}

.metric-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.metric-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
  margin-top: 4px;
}

/* Squishy */

.diagram-squishy {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 40px 24px;
}

.squishy-core {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.core-blob {
  width: 120px;
  height: 120px;
  border-radius: 40% 60% 55% 45% / 55% 45% 60% 40%;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-3));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #0a0c10;
  font-size: 1.1rem;
  animation: blobMorph 8s ease-in-out infinite;
  box-shadow: 0 0 40px rgba(43, 212, 197, 0.25);
}

@keyframes blobMorph {
  0%, 100% { border-radius: 40% 60% 55% 45% / 55% 45% 60% 40%; }
  25% { border-radius: 55% 45% 40% 60% / 45% 55% 45% 55%; }
  50% { border-radius: 45% 55% 60% 40% / 60% 40% 55% 45%; }
  75% { border-radius: 60% 40% 45% 55% / 40% 60% 60% 40%; }
}

.orbit {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 1px dashed var(--text-3);
  border-radius: 50%;
  opacity: 0.35;
  animation: spin 24s linear infinite;
}

.orbit-2 { animation-duration: 32s; animation-direction: reverse; }
.orbit-3 { animation-duration: 44s; }

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.orbit .ext-chip {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.75rem;
  color: var(--text-2);
  white-space: nowrap;
}

.orbit-1 .ext-chip:nth-child(1) { top: 0; left: 50%; transform: translateX(-50%); }
.orbit-1 .ext-chip:nth-child(2) { bottom: 0; left: 50%; transform: translateX(-50%); }
.orbit-2 .ext-chip:nth-child(1) { left: 0; top: 50%; transform: translateY(-50%); }
.orbit-2 .ext-chip:nth-child(2) { right: 0; top: 50%; transform: translateY(-50%); }
.orbit-3 .ext-chip:nth-child(1) { top: 15%; right: 10%; }
.orbit-3 .ext-chip:nth-child(2) { bottom: 15%; left: 10%; }

.squishy-labels {
  display: flex;
  width: 100%;
  justify-content: space-between;
  max-width: 420px;
  color: var(--text-3);
  font-size: 0.85rem;
}

.quote-block {
  margin: 40px 0;
  padding: 28px 32px;
  border-left: 4px solid var(--accent-3);
  background: var(--bg-3);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.quote-block blockquote {
  margin: 0;
  font-family: Georgia, serif;
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--text);
}

.quote-block cite {
  display: block;
  margin-top: 16px;
  color: var(--text-3);
  font-size: 0.9rem;
  font-style: normal;
}

.quote-compact {
  border-left-color: var(--accent-2);
}

/* Hypothesis / read-it-later */

.diagram-readlater {
  padding: 0;
  overflow: hidden;
}

.readlater-tabs {
  display: flex;
  gap: 8px;
  padding: 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.rl-tab {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-2);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.rl-tab:hover, .rl-tab:focus {
  color: var(--text);
  background: var(--bg-3);
}

.rl-tab.active {
  background: var(--accent-2);
  color: #0a0c10;
  border-color: var(--accent-2);
  font-weight: 700;
}

.readlater-stage {
  padding: 24px;
}

.rl-prompt {
  font-style: italic;
  color: var(--text);
  background: var(--surface);
  padding: 16px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-2);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.rl-animation {
  position: relative;
  height: 180px;
  background: var(--bg-2);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.rl-app {
  background: var(--surface-2);
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.rl-robot {
  font-size: 2.4rem;
  filter: grayscale(0.3);
  transition: transform 0.3s ease;
}

.rl-robot.animating {
  transform: scale(1.2) rotate(10deg);
}

.rl-hooks {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hook {
  background: var(--surface);
  border: 1px dashed var(--text-3);
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-2);
}

.rl-extension {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--accent);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity 0.4s, transform 0.4s;
}

.rl-extension.visible {
  opacity: 1;
  transform: translateY(0);
}

.rl-code pre {
  margin: 0;
  border-radius: var(--radius-sm);
}

/* Webhook contrast */

.diagram-webhook {
  padding: 24px;
}

.model-toggle {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.model-toggle label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-2);
  cursor: pointer;
}

.model-toggle input[type="radio"] {
  accent-color: var(--accent-2);
}

.model-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 24px;
  background: var(--bg-2);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  min-height: 160px;
}

.box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 24px;
  text-align: center;
  font-weight: 700;
  max-width: 220px;
  transition: var(--transition);
}

.arrow {
  width: 60px;
  height: 2px;
  background: var(--text-3);
  position: relative;
}

.arrow::after {
  content: '';
  position: absolute;
  right: 0;
  top: -4px;
  border: 5px solid transparent;
  border-left-color: var(--text-3);
}

.model-note {
  color: var(--text-2);
  margin: 0;
}

/* Use cases */

.diagram-usecases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
}

.usecase-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.usecase-card:hover,
.usecase-card:focus,
.usecase-card.active {
  border-color: var(--accent-2);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.usecase-card.active::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent-2);
  border-radius: var(--radius);
  pointer-events: none;
}

.uc-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.usecase-card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.usecase-card p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.95rem;
}

.usecase-detail {
  background: var(--bg-3);
  border-left: 4px solid var(--accent-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 22px;
  margin-top: 20px;
}

.usecase-detail h4 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.usecase-detail p {
  margin: 0;
  color: var(--text-2);
}

/* Threat wall */

.diagram-threat {
  min-height: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  padding: 40px 24px;
  background:
    radial-gradient(circle at 50% 0%, rgba(255, 77, 109, 0.12), transparent 50%),
    var(--bg-3);
}

.dream-extension {
  text-align: center;
}

.dream-blob {
  display: inline-block;
  padding: 16px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-3));
  color: #0a0c10;
  font-weight: 800;
  box-shadow: 0 0 30px rgba(43, 212, 197, 0.35);
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.threat-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 600px;
}

.threat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 10px;
  color: var(--text-2);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.threat-card:hover,
.threat-card:focus,
.threat-card.active {
  background: var(--warning-bg);
  border-color: var(--warning);
  color: var(--warning);
  transform: scale(1.02);
}

.threat-readout {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 16px;
  max-width: 600px;
  width: 100%;
  text-align: center;
  color: var(--text-2);
  min-height: 60px;
}

.threat-readout strong {
  color: var(--warning);
}

/* Timeline */

.diagram-timeline {
  padding: 30px;
}

.timeline-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  padding: 24px 0;
}

.timeline-line::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 10%;
  right: 10%;
  height: 2px;
  background: var(--surface-2);
  z-index: 0;
}

.timeline-event {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 28%;
  text-align: center;
}

.timeline-event .year {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--border);
  font-weight: 800;
  color: var(--text-2);
}

.timeline-event.highlight .year {
  background: var(--accent-2);
  color: #0a0c10;
  border-color: var(--accent-2);
  box-shadow: 0 0 20px rgba(43, 212, 197, 0.3);
}

.timeline-event .event {
  font-size: 0.9rem;
  color: var(--text-2);
}

/* Code panels */

.code-comparison {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 32px 0;
}

.code-tabs {
  display: flex;
  gap: 4px;
  padding: 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.code-tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-2);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.85rem;
  white-space: nowrap;
  transition: var(--transition);
}

.code-tab:hover, .code-tab:focus {
  background: var(--bg-3);
  color: var(--text);
}

.code-tab.active {
  background: var(--accent-3);
  color: #fff;
  border-color: var(--accent-3);
  font-weight: 700;
}

.code-panel {
  display: none;
  padding: 20px;
  overflow-x: auto;
}

.code-panel.active {
  display: block;
}

pre {
  margin: 0;
  padding: 18px;
  background: #0b0d12;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.55;
}

code {
  font-family: var(--font-mono);
}

/* Syntax highlighting colors */
.token-keyword { color: #ff7b72; }
.token-string { color: #a5d6ff; }
.token-number { color: #79c0ff; }
.token-comment { color: #8b949e; font-style: italic; }
.token-function { color: #d2a8ff; }
.token-type { color: #ffa657; }
.token-variable { color: #e6edf3; }
.token-operator { color: #ff7b72; }
.token-annotation { color: #7ee787; }

/* Properties grid */

.properties-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
  margin-bottom: 32px;
}

.prop-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.prop-card:hover,
.prop-card:focus,
.prop-card.active {
  border-color: var(--accent-2);
  background: var(--surface);
  transform: translateY(-2px);
}

.prop-card.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: var(--accent-2);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.prop-ordinal {
  display: inline-block;
  width: 24px;
  height: 24px;
  line-height: 24px;
  text-align: center;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--accent-2);
  font-size: 0.75rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.prop-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.prop-card p {
  margin: 0;
  color: var(--text-3);
  font-size: 0.85rem;
  line-height: 1.45;
}

.prop-detail {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.prop-detail h3 {
  margin: 0 0 12px;
  font-size: 1.3rem;
}

.prop-detail p {
  color: var(--text-2);
  margin: 0 0 20px;
}

.prop-viz {
  min-height: 160px;
  background: var(--bg-2);
  border-radius: var(--radius-sm);
  padding: 16px;
}

/* Heroku log flood */

.heroku-story {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}

.heroku-story h3 {
  margin: 0 0 12px;
}

.heroku-story p {
  color: var(--text-2);
}

.log-flood {
  margin-top: 20px;
  background: #0b0d12;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.log-output {
  height: 160px;
  overflow-y: auto;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-2);
  line-height: 1.4;
}

.log-output .flood-line {
  display: block;
  color: var(--warning);
  opacity: 0.85;
}

.log-output .limit-line {
  color: var(--ok);
}

.log-controls {
  display: flex;
  gap: 10px;
  padding: 12px;
  background: var(--surface);
  align-items: center;
  flex-wrap: wrap;
}

.log-btn {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition);
}

.log-btn:hover:not(:disabled),
.log-btn:focus:not(:disabled) {
  background: var(--bg-3);
}

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

#log-rate {
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--text-3);
  font-size: 0.85rem;
}

/* Capability lab */

.capability-lab {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 40px;
}

.capability-lab h3 {
  margin: 0 0 12px;
}

.capability-lab > p {
  color: var(--text-2);
  margin: 0 0 20px;
}

.capability-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.cap-tab {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition);
}

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

.cap-tab.active {
  background: var(--accent-2);
  color: #0a0c10;
  border-color: var(--accent-2);
  font-weight: 700;
}

.cap-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.cap-diagram {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg-3);
  border-radius: var(--radius-sm);
  padding: 20px;
  min-height: 220px;
  justify-content: center;
}

.cap-actor {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
  font-weight: 700;
  font-size: 0.9rem;
  transition: var(--transition);
}

.cap-actor.user {
  border-color: var(--accent-2);
}

.cap-actor.env.unsafe {
  border-color: var(--warning);
  color: var(--warning);
}

.cap-actor.env.safe {
  border-color: var(--ok);
  color: var(--ok);
}

.cap-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cap-actions button {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  text-align: left;
  transition: var(--transition);
}

.cap-actions button:hover:not(:disabled),
.cap-actions button:focus:not(:disabled) {
  background: var(--surface-2);
}

.cap-actions button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.cap-terminal {
  grid-column: 1 / -1;
  background: #0b0d12;
  border-radius: var(--radius-sm);
  padding: 16px;
  min-height: 120px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-2);
  overflow-y: auto;
}

.terminal-line {
  margin: 0 0 8px;
}

.terminal-line.safe { color: var(--ok); }
.terminal-line.unsafe { color: var(--warning); }
.terminal-line.info { color: var(--text-2); }

.cap-snippet {
  margin-top: 24px;
}

.cap-snippet pre {
  max-height: 240px;
  overflow-y: auto;
}

/* Tech matrix */

.diagram-matrix {
  overflow-x: auto;
  padding: 0;
}

.tech-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.tech-table th,
.tech-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.tech-table thead th {
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
  position: sticky;
  top: 0;
}

.tech-table th.prop-head {
  cursor: pointer;
  transition: var(--transition);
}

.tech-table th.prop-head:hover,
.tech-table th.prop-head.active {
  background: var(--surface-2);
}

.tech-table tbody tr:hover {
  background: var(--surface);
}

.tech-table td:first-child {
  font-weight: 700;
  color: var(--text);
}

.score {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.score-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.score-good { background: var(--ok); }
.score-mid { background: #facc15; }
.score-weak { background: var(--warning); }

.tech-detail {
  padding: 20px;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  min-height: 80px;
}

.tech-detail h4 {
  margin: 0 0 8px;
}

.tech-detail p {
  margin: 0;
  color: var(--text-2);
}

.tech-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.tech-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}

.tech-card:hover,
.tech-card:focus {
  border-color: var(--accent-3);
  transform: translateY(-3px);
}

.tech-card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.tech-card p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.9rem;
}

/* Dynamic Workers */

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.feature-item {
  display: flex;
  gap: 14px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  transition: var(--transition);
}

.feature-item:hover,
.feature-item:focus {
  border-color: var(--accent-2);
}

.feature-check {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--ok-bg);
  color: var(--ok);
  font-weight: 800;
  flex-shrink: 0;
}

.feature-item h4 {
  margin: 0 0 4px;
  font-size: 0.95rem;
}

.feature-item p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.85rem;
}

/* Closing */

.closing-statement {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  line-height: 1.55;
  color: var(--text-2);
}

/* Footer */

.site-footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 40px 0;
  color: var(--text-3);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0 0 8px;
}

/* Scroll reveal */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 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;
  }
}

body.no-motion .reveal {
  opacity: 1;
  transform: none;
  transition: none;
}

body.no-motion .hero-backdrop,
body.no-motion .core-blob,
body.no-motion .orbit,
body.no-motion .dream-blob {
  animation: none;
}

/* Mobile */

@media (max-width: 720px) {
  .section-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    gap: 8px;
  }

  .section-nav.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: calc(var(--header-height) + 24px) 20px 60px;
  }

  .hero-content {
    text-align: left;
    align-items: flex-start;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .chapter {
    padding: 48px 0;
  }

  .diagram {
    padding: 16px;
  }

  .squishy-core {
    width: 220px;
    height: 220px;
  }

  .core-blob {
    width: 90px;
    height: 90px;
    font-size: 0.9rem;
  }

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

  .timeline-line {
    flex-direction: column;
    gap: 24px;
  }

  .timeline-line::before {
    display: none;
  }

  .timeline-event {
    width: 100%;
  }

  .model-diagram {
    flex-direction: column;
    gap: 16px;
  }

  .model-diagram .arrow {
    transform: rotate(90deg);
    width: 2px;
    height: 40px;
  }

  .model-diagram .arrow::after {
    right: -4px;
    top: auto;
    bottom: 0;
    border: 5px solid transparent;
    border-top-color: var(--text-3);
    border-left-color: transparent;
  }

  .cap-stage {
    grid-template-columns: 1fr;
  }

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

  .usecase-detail {
    padding: 18px;
  }
}