/* ─────────────────────────────────────────────────────────────────────
   Info Diffusion — visual system
   ───────────────────────────────────────────────────────────────────── */

:root {
  --bg:        #0a0c10;
  --bg-2:      #0e1117;
  --bg-3:      #131722;
  --fg:        #ece9e1;
  --fg-dim:    rgba(236, 233, 225, 0.62);
  --fg-mute:   rgba(236, 233, 225, 0.34);
  --rule:      rgba(236, 233, 225, 0.12);
  --rule-soft: rgba(236, 233, 225, 0.06);

  --signal:    oklch(0.86 0.15 195);     /* informed / actively spreading */
  --signal-2:  oklch(0.78 0.18 200);
  --silent:    oklch(0.78 0.13 65);      /* recovered / silent */
  --susc:      rgba(236, 233, 225, 0.32);

  --serif: 'Newsreader', 'Times New Roman', Times, serif;
  --mono:  'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --measure: 64rem;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--serif);
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body {
  font-size: 18px;
  line-height: 1.55;
  letter-spacing: 0.005em;
}
::selection { background: var(--signal); color: var(--bg); }

/* ── Type ──────────────────────────────────────────── */
.mono { font-family: var(--mono); font-weight: 400; letter-spacing: 0; }
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.eyebrow .dot {
  display: inline-block; width: 6px; height: 6px;
  background: var(--signal); border-radius: 50%;
  vertical-align: 1px; margin-right: 10px;
  box-shadow: 0 0 12px var(--signal);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.7); }
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 300;
  letter-spacing: -0.02em;
  margin: 0;
}
h1 { font-size: clamp(56px, 9vw, 168px); line-height: 0.95; }
h2 { font-size: clamp(40px, 5.6vw, 96px); line-height: 1.0; }
h3 { font-size: clamp(24px, 2.4vw, 36px); line-height: 1.1; font-weight: 400; }
.italic { font-style: italic; font-weight: 300; }

p { margin: 0; }

a { color: inherit; text-decoration: none; }
a.link {
  color: var(--fg);
  border-bottom: 1px solid var(--rule);
  transition: border-color 200ms;
}
a.link:hover { border-color: var(--signal); }

/* ── Layout helpers ───────────────────────────────── */
.shell {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 64px);
}
.section { padding: clamp(80px, 12vw, 180px) 0; position: relative; }
.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }

/* ── Top bar ──────────────────────────────────────── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px clamp(20px, 4vw, 64px);
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em;
  color: var(--fg);
  mix-blend-mode: difference;
  pointer-events: none;
}
.topbar a, .topbar span { pointer-events: auto; }
.topbar .left { display: flex; gap: 14px; align-items: center; }
.topbar .right { display: flex; gap: 28px; align-items: center; }
.topbar .right a { opacity: 0.75; transition: opacity 200ms; }
.topbar .right a:hover { opacity: 1; }
.topbar .glyph {
  width: 14px; height: 14px; border: 1px solid currentColor; border-radius: 50%;
  position: relative;
}
.topbar .glyph::after {
  content: ""; position: absolute; inset: 3px; border-radius: 50%;
  background: var(--signal);
  animation: pulse-dot 2.4s ease-in-out infinite;
}

/* ─────────────────────────────────────────────────────────────────────
   HERO
   ───────────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  height: 100vh;
  min-height: 720px;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 60%, #0e1322 0%, #0a0c10 70%, #06070a 100%);
}
.hero canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
}
.hero-vignette {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 50% 50%, transparent 30%, rgba(10,12,16,0.55) 75%, rgba(6,7,10,0.9) 100%),
    linear-gradient(180deg, rgba(10,12,16,0.4) 0%, transparent 18%, transparent 70%, rgba(10,12,16,0.85) 100%);
  pointer-events: none;
  z-index: 2;
}
.hero-grain {
  position: absolute; inset: -10%;
  z-index: 3;
  opacity: 0.06;
  mix-blend-mode: screen;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 4;
  height: 100%;
  display: grid;
  grid-template-rows: 1fr auto auto auto 1fr;
  padding: 0 clamp(20px, 4vw, 64px) clamp(40px, 6vw, 80px);
}
.hero-eyebrow {
  align-self: end;
  padding-top: 80px;
}
.hero-title {
  align-self: center;
  margin-top: 24px;
}
.hero-title h1 {
  font-style: italic;
  font-weight: 300;
}
.hero-title h1 .word { display: inline-block; overflow: hidden; vertical-align: baseline; }
.hero-title h1 .word > span {
  display: inline-block;
  transform: translateY(110%);
  animation: rise 1100ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
.hero-title h1 .word:nth-child(2) > span { animation-delay: 90ms; }
.hero-title h1 .word:nth-child(3) > span { animation-delay: 180ms; }
.hero-title h1 .word:nth-child(4) > span { animation-delay: 270ms; }
@keyframes rise { to { transform: translateY(0%); } }

.hero-sub {
  align-self: end;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(24px, 4vw, 80px);
  align-items: end;
  margin-top: 48px;
  opacity: 0;
  animation: fade 1200ms 600ms forwards;
}
@keyframes fade { to { opacity: 1; } }
.hero-sub .lede {
  font-size: clamp(20px, 1.7vw, 26px);
  line-height: 1.35;
  font-weight: 300;
  color: var(--fg);
  max-width: 38ch;
}
.hero-sub .lede em { font-style: italic; color: var(--signal); }
.hero-sub .meta {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  font-family: var(--mono); font-size: 11px;
  color: var(--fg-dim); letter-spacing: 0.04em;
  align-self: end;
}
.hero-sub .meta .label { color: var(--fg-mute); text-transform: uppercase; letter-spacing: 0.18em; font-size: 10px; }
.hero-sub .meta .val { color: var(--fg); font-size: 13px; margin-top: 4px; }
.hero-sub .meta .val .sig { color: var(--signal); }

.hero-bottom {
  align-self: end;
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-top: 48px;
  opacity: 0; animation: fade 1200ms 900ms forwards;
}
.scroll-indicator {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--fg-dim);
  display: flex; align-items: center; gap: 12px;
}
.scroll-indicator .line {
  width: 60px; height: 1px; background: var(--rule); position: relative; overflow: hidden;
}
.scroll-indicator .line::after {
  content: ""; position: absolute; top: 0; left: -30%;
  width: 30%; height: 100%; background: var(--signal);
  animation: line-slide 2.4s ease-in-out infinite;
}
@keyframes line-slide {
  0%   { left: -30%; }
  100% { left: 100%; }
}

.hero-counter {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  text-align: right;
}
.hero-counter .big {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(48px, 5vw, 72px);
  line-height: 0.9;
  color: var(--signal);
  font-weight: 300;
  letter-spacing: -0.02em;
  display: block;
  margin-bottom: 6px;
}

/* ─────────────────────────────────────────────────────────────────────
   MANIFESTO
   ───────────────────────────────────────────────────────────────────── */
.manifesto {
  position: relative;
}
.manifesto .grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(40px, 6vw, 120px);
  align-items: start;
}
.manifesto .side {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.22em;
  color: var(--fg-mute);
  padding-top: 14px;
  border-top: 1px solid var(--rule);
}
.manifesto .body {
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.25;
  font-weight: 300;
  letter-spacing: -0.015em;
  max-width: 24ch;
}
.manifesto .body em { font-style: italic; color: var(--signal); }
.manifesto .body .mute { color: var(--fg-dim); }
.manifesto .body p + p { margin-top: 1.1em; }

/* ─────────────────────────────────────────────────────────────────────
   STATES — S / I / R
   ───────────────────────────────────────────────────────────────────── */
.states {
  background: var(--bg);
  position: relative;
}
.states .header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: end;
  margin-bottom: clamp(60px, 8vw, 120px);
}
.states h2 .italic { color: var(--fg); }
.states .header .right {
  font-size: 18px;
  line-height: 1.55;
  color: var(--fg-dim);
  max-width: 42ch;
  padding-bottom: 16px;
}

.state-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.state-card {
  padding: 56px 36px 56px;
  border-right: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
  min-height: 480px;
  display: flex;
  flex-direction: column;
  isolation: isolate;
}
.state-card:last-child { border-right: 0; }
.state-card .index {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.2em; color: var(--fg-mute);
  text-transform: uppercase;
}
.state-card .letter {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(120px, 14vw, 220px);
  line-height: 0.85;
  margin: 18px 0 4px;
  letter-spacing: -0.04em;
}
.state-card .name {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.state-card .desc {
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg-dim);
  max-width: 32ch;
  margin-bottom: 28px;
}
.state-card .viz {
  margin-top: auto;
  height: 120px;
  position: relative;
  border-top: 1px solid var(--rule-soft);
  padding-top: 16px;
}
.state-card .viz canvas { width: 100%; height: 100%; }

.state-card[data-state="S"] .letter { color: var(--fg); }
.state-card[data-state="I"] .letter { color: var(--signal); }
.state-card[data-state="R"] .letter { color: var(--silent); }

.state-card .glow {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle at 30% 30%, var(--signal) 0%, transparent 50%);
  opacity: 0;
  z-index: -1;
  pointer-events: none;
  transition: opacity 600ms;
}
.state-card[data-state="I"] .glow { opacity: 0.08; }
.state-card[data-state="R"] .glow {
  background: radial-gradient(circle at 30% 30%, var(--silent) 0%, transparent 50%);
  opacity: 0.05;
}

/* flow between */
.flow-arrow {
  position: relative; height: 1px; background: var(--rule);
  margin: 0;
}

/* ─────────────────────────────────────────────────────────────────────
   MATH — R₀ section
   ───────────────────────────────────────────────────────────────────── */
.math {
  position: relative;
  background: linear-gradient(180deg, var(--bg) 0%, #08090c 100%);
  overflow: hidden;
}
.math-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(circle at 80% 20%, oklch(0.4 0.15 195 / 0.10) 0%, transparent 40%),
    radial-gradient(circle at 10% 80%, oklch(0.4 0.13 65  / 0.08) 0%, transparent 40%);
  pointer-events: none;
}
.math-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 120px);
  align-items: center;
  position: relative; z-index: 1;
}

.math-eq {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: clamp(80px, 12vw, 200px);
}
.math-eq .lhs { color: var(--fg); }
.math-eq .eq  { color: var(--fg-mute); margin: 0 18px; }
.math-eq .frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
  position: relative;
  font-size: 0.72em;
}
.math-eq .frac .num,
.math-eq .frac .den {
  padding: 0.05em 0.15em;
}
.math-eq .frac .num { color: var(--signal); }
.math-eq .frac .den { color: var(--silent); }
.math-eq .frac .bar {
  height: 2px; width: 100%;
  background: var(--fg);
  margin: 0.08em 0;
}

.math-right h3 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 28px;
  font-weight: 400;
}
.math-table {
  border-top: 1px solid var(--rule);
}
.math-row {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.math-row .sym {
  font-family: var(--serif);
  font-style: italic;
  font-size: 42px;
  line-height: 1;
  color: var(--fg);
}
.math-row .name {
  font-family: var(--serif); font-size: 18px;
  color: var(--fg); font-weight: 400;
}
.math-row .desc {
  font-family: var(--mono); font-size: 12px;
  color: var(--fg-dim); margin-top: 4px;
}
.math-row .verdict {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase;
  padding: 6px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
}
.math-row .verdict.viral { color: var(--signal); border-color: oklch(0.6 0.12 195); }
.math-row .verdict.fizzle { color: var(--silent); border-color: oklch(0.55 0.10 65); }
.math-row .verdict.edge   { color: var(--fg-dim); }

.math-callout {
  margin-top: 56px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1px;
  background: var(--rule);
}
.math-callout > div {
  background: var(--bg);
  padding: 28px 24px;
}
.math-callout .case-label {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--fg-mute); margin-bottom: 14px;
}
.math-callout .case-val {
  font-family: var(--serif); font-style: italic;
  font-size: 48px; line-height: 1; margin-bottom: 12px;
}
.math-callout .case-1 .case-val { color: var(--silent); }
.math-callout .case-2 .case-val { color: var(--fg); }
.math-callout .case-3 .case-val { color: var(--signal); }
.math-callout .case-note {
  font-size: 14px; color: var(--fg-dim); line-height: 1.5;
}

/* ─────────────────────────────────────────────────────────────────────
   S-CURVE — drawn-in graph
   ───────────────────────────────────────────────────────────────────── */
.scurve {
  background: var(--bg);
  position: relative;
}
.scurve .header {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: end; margin-bottom: 64px;
}
.scurve .header .right {
  font-size: 17px; color: var(--fg-dim);
  max-width: 38ch; padding-bottom: 18px; line-height: 1.55;
}
.scurve-stage {
  position: relative;
  height: 580px;
  border: 1px solid var(--rule);
  border-radius: 0;
  overflow: hidden;
  background:
    linear-gradient(180deg, transparent, rgba(255,255,255,0.01)),
    var(--bg-2);
}
.scurve-stage svg { width: 100%; height: 100%; display: block; }
.scurve-stage .grid-line { stroke: var(--rule-soft); stroke-width: 1; }
.scurve-stage .axis { stroke: var(--rule); stroke-width: 1; }
.scurve-stage .axis-label {
  font-family: var(--mono); font-size: 10px;
  letter-spacing: 0.12em; fill: var(--fg-mute);
  text-transform: uppercase;
}
.scurve-stage .curve-r {
  fill: none; stroke: var(--silent); stroke-width: 1.5;
  stroke-dasharray: 4 4;
}
.scurve-stage .curve-i {
  fill: none; stroke: var(--signal); stroke-width: 2.5;
  filter: drop-shadow(0 0 8px oklch(0.86 0.15 195 / 0.6));
}
.scurve-stage .area-i {
  fill: url(#area-i-grad);
  opacity: 0.5;
}
.scurve-stage .curve-cum {
  fill: none; stroke: var(--fg); stroke-width: 1.5;
}
.scurve-stage .marker {
  fill: var(--signal); r: 4;
  filter: drop-shadow(0 0 6px var(--signal));
}
.scurve-legend {
  position: absolute;
  top: 24px; right: 24px;
  display: grid; gap: 10px;
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.08em;
  background: rgba(10, 12, 16, 0.6);
  backdrop-filter: blur(8px);
  padding: 14px 18px;
  border: 1px solid var(--rule);
}
.scurve-legend .li { display: flex; align-items: center; gap: 10px; }
.scurve-legend .swatch { width: 14px; height: 2px; }
.scurve-legend .li.signal .swatch { background: var(--signal); box-shadow: 0 0 6px var(--signal); }
.scurve-legend .li.cum .swatch { background: var(--fg); }
.scurve-legend .li.silent .swatch {
  background: var(--silent);
  background-image: linear-gradient(90deg, var(--silent) 50%, transparent 50%);
  background-size: 6px 100%;
}

.scurve-readouts {
  position: absolute;
  bottom: 24px; left: 24px;
  display: flex; gap: 36px;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--fg-mute);
}
.scurve-readouts .v {
  font-family: var(--serif); font-style: italic;
  font-size: 28px; line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fg);
  display: block; margin-top: 4px;
  text-transform: none;
}
.scurve-readouts .v.sig { color: var(--signal); }
.scurve-readouts .v.sil { color: var(--silent); }

/* ─────────────────────────────────────────────────────────────────────
   PRESETS
   ───────────────────────────────────────────────────────────────────── */
.presets {
  background: linear-gradient(180deg, var(--bg) 0%, #07080b 100%);
  position: relative;
}
.presets .header {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: end; margin-bottom: clamp(50px, 7vw, 100px);
}
.presets h2 .italic { color: var(--signal); }
.presets .header .right {
  font-size: 17px; line-height: 1.55; color: var(--fg-dim);
  max-width: 42ch; padding-bottom: 16px;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.preset {
  background: var(--bg);
  padding: 32px;
  position: relative;
  min-height: 380px;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 16px;
  overflow: hidden;
  transition: background 300ms;
}
.preset:hover { background: var(--bg-2); }
.preset .label {
  font-family: var(--mono); font-size: 10px;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--fg-mute);
  display: flex; justify-content: space-between;
}
.preset .label .r0 { color: var(--signal); }
.preset .label .r0.fizzle { color: var(--silent); }
.preset .name {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.05;
}
.preset .name .it { font-style: italic; color: var(--fg-dim); display: block; font-size: 16px; margin-bottom: 4px; }
.preset .desc {
  font-size: 14px;
  color: var(--fg-dim);
  line-height: 1.5;
  max-width: 30ch;
  align-self: end;
}
.preset .mini {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.6;
  pointer-events: none;
}
.preset .mini canvas { width: 100%; height: 100%; display: block; }
.preset .stats {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px;
  font-family: var(--mono); font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
  border-top: 1px solid var(--rule-soft);
  padding-top: 16px;
  text-transform: uppercase;
}
.preset .stats .v {
  font-family: var(--serif); font-style: italic;
  font-size: 22px; line-height: 1;
  letter-spacing: -0.01em;
  color: var(--fg);
  display: block; margin-top: 4px;
  text-transform: none;
}

/* ─────────────────────────────────────────────────────────────────────
   PARAMS — the five tuning knobs
   ───────────────────────────────────────────────────────────────────── */
.params { background: #07080b; }
.params .header { margin-bottom: clamp(50px, 7vw, 100px); }
.params .header h2 { max-width: 18ch; }
.params .header .right {
  font-size: 17px; color: var(--fg-dim); margin-top: 24px; max-width: 60ch;
}

.param-list {
  border-top: 1px solid var(--rule);
}
.param {
  display: grid;
  grid-template-columns: 80px 200px 1fr 120px;
  gap: clamp(20px, 3vw, 60px);
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
  align-items: center;
  transition: background 300ms;
}
.param:hover { background: rgba(255,255,255,0.015); }
.param .idx {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.18em; color: var(--fg-mute);
}
.param .pname {
  font-family: var(--serif); font-size: 22px;
  font-weight: 400; letter-spacing: -0.01em;
}
.param .pname .sym {
  font-style: italic; color: var(--signal); margin-right: 10px;
}
.param .pdesc {
  font-size: 15px; color: var(--fg-dim);
  line-height: 1.5; max-width: 56ch;
}
.param .pval {
  font-family: var(--mono); font-size: 12px;
  color: var(--fg); text-align: right;
}
.param .pval .num {
  font-family: var(--serif); font-style: italic;
  font-size: 28px; color: var(--signal);
  display: block; margin-bottom: 4px;
  letter-spacing: -0.02em;
}

/* ─────────────────────────────────────────────────────────────────────
   FOOTER
   ───────────────────────────────────────────────────────────────────── */
.cta {
  position: relative;
  padding: clamp(120px, 18vw, 240px) 0;
  background: var(--bg);
  overflow: hidden;
}
.cta canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}
.cta .veil {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 50%, transparent 0%, rgba(10,12,16,0.6) 70%, var(--bg) 100%);
  pointer-events: none;
}
.cta-inner {
  position: relative; z-index: 2;
  text-align: center;
}
.cta-inner .eyebrow { margin-bottom: 32px; }
.cta-inner h2 {
  font-size: clamp(48px, 8vw, 140px);
  font-style: italic;
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 0.98;
  max-width: 16ch;
  margin: 0 auto 40px;
}
.cta-inner h2 em { color: var(--signal); font-style: italic; }
.cta-inner .sub {
  font-size: 18px;
  color: var(--fg-dim);
  max-width: 52ch;
  margin: 0 auto 56px;
  line-height: 1.55;
}
.cta-cmd {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--fg);
  border: 1px solid var(--rule);
  padding: 18px 28px;
  background: rgba(10,12,16,0.6);
  backdrop-filter: blur(10px);
  letter-spacing: 0.04em;
  transition: border-color 200ms;
}
.cta-cmd:hover { border-color: var(--signal); }
.cta-cmd .prompt { color: var(--signal); }
.cta-cmd .caret {
  display: inline-block; width: 8px; height: 16px;
  background: var(--signal);
  animation: blink 1.1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ── on-ramps grid (cta) ─────────────────────────────── */
.onramps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  text-align: left;
  margin: 0 auto 64px;
  max-width: 1080px;
  border: 1px solid var(--rule);
  background: rgba(10,12,16,0.55);
  backdrop-filter: blur(10px);
}
.onramp {
  display: flex;
  flex-direction: column;
  padding: 32px 28px 28px;
  border-right: 1px solid var(--rule);
  color: var(--fg);
  transition: background 200ms;
  min-height: 280px;
}
.onramp:last-child { border-right: 0; }
.onramp:not(.static):hover { background: rgba(236, 233, 225, 0.03); }
.onramp:not(.static):hover .go { color: var(--signal); }
.onramp:not(.static):hover .go .arrow { transform: translateX(4px); }

.onramp-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
}
.onramp .num {
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.2em;
}
.onramp .kicker {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.onramp .name {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 14px;
}
.onramp .desc {
  font-size: 14px;
  line-height: 1.55;
  color: var(--fg-dim);
  flex: 1;
}
.onramp .desc .modify-label {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 14px 0 4px;
}
.onramp .desc .modify-label:first-child { margin-top: 0; }
.onramp .go {
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg);
  transition: color 200ms;
}
.onramp .go .arrow { transition: transform 200ms; }

/* ── quick-start command block (cta) ─────────────────── */
.quickstart {
  max-width: 720px;
  margin: 0 auto;
  text-align: left;
  border: 1px solid var(--rule);
  background: rgba(10,12,16,0.7);
  backdrop-filter: blur(10px);
  padding: 18px 22px 20px;
}
.quickstart-head {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule-soft);
}
.quickstart-body {
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--fg);
  letter-spacing: 0.02em;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}
.quickstart-body .line { display: block; }
.quickstart-body .prompt { color: var(--signal); margin-right: 10px; }
.quickstart-body .comment { color: var(--fg-mute); }

footer {
  border-top: 1px solid var(--rule);
  padding: 40px 0 32px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--fg-mute);
}
footer .row {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 20px;
}
footer .built { display: flex; align-items: center; gap: 12px; }
footer .built img { height: 22px; }

/* ─────────────────────────────────────────────────────────────────────
   MOTION + UTILITIES
   ───────────────────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1000ms cubic-bezier(0.2, 0.7, 0.2, 1),
              transform 1000ms cubic-bezier(0.2, 0.7, 0.2, 1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 880px) {
  .topbar .right { gap: 16px; }
  .topbar .right .hide-sm { display: none; }
  .manifesto .grid { grid-template-columns: 1fr; }
  .manifesto .side { display: none; }
  .states .header,
  .scurve .header,
  .presets .header { grid-template-columns: 1fr; gap: 20px; }
  .state-grid { grid-template-columns: 1fr; }
  .state-card { border-right: 0; border-bottom: 1px solid var(--rule); min-height: 360px; }
  .state-card:last-child { border-bottom: 0; }
  .math-grid { grid-template-columns: 1fr; }
  .math-callout { grid-template-columns: 1fr; }
  .preset-grid { grid-template-columns: 1fr; }
  .onramps { grid-template-columns: 1fr; }
  .onramp { border-right: 0; border-bottom: 1px solid var(--rule); min-height: 0; }
  .onramp:last-child { border-bottom: 0; }
  .quickstart-body { font-size: 11.5px; }
  .hero-sub { grid-template-columns: 1fr; gap: 24px; }
  .hero-bottom { flex-direction: column; align-items: flex-start; gap: 20px; }
  .param { grid-template-columns: 50px 1fr; gap: 12px; }
  .param .pdesc, .param .pval { grid-column: 2; }
  .param .pval { text-align: left; }
}