:root {
  --bg: #050505;
  --panel: #0b0b0c;
  --panel-2: #101012;
  --line: rgba(255,255,255,.22);
  --line-strong: rgba(255,255,255,.72);
  --text: #f6f6f3;
  --muted: rgba(246,246,243,.58);
  --cyan: #63e7ff;
  --yellow: #f5f17a;
  --green: #76f5a5;
  --blue: #8ea9ff;
  --pink: #ff72df;
  --max: 1180px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(99,231,255,.055), transparent 25rem),
    radial-gradient(circle at 80% 20%, rgba(255,114,223,.05), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  color: #050505;
  background: var(--yellow);
}

a { color: inherit; }

.noise {
  position: fixed;
  inset: 0;
  z-index: 99;
  pointer-events: none;
  opacity: .045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E");
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px max(24px, calc((100vw - var(--max))/2));
  background: linear-gradient(to bottom, rgba(5,5,5,.94), rgba(5,5,5,.7), transparent);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
}

.brand-mark {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.04em;
}

.brand-sub {
  color: var(--muted);
  font-size: .75rem;
}

.top-nav {
  display: flex;
  gap: 6px;
  padding: 4px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 999px;
  background: rgba(255,255,255,.035);
}

.top-nav a {
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: .75rem;
  font-weight: 600;
}

.top-nav a:hover,
.top-nav a.active {
  color: var(--text);
  background: rgba(255,255,255,.08);
}

.hero {
  min-height: 100svh;
  max-width: var(--max);
  margin: 0 auto;
  padding: 140px 24px 72px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, .9fr);
  align-items: center;
  gap: 50px;
  position: relative;
}

.eyebrow,
.section-label,
.stage-kicker,
.example-tag {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 18px 0 24px;
  max-width: 750px;
  font-size: clamp(3.3rem, 7vw, 6.8rem);
  letter-spacing: -.065em;
  line-height: .91;
}

.hero h1 span {
  color: var(--muted);
}

.hero-copy {
  margin: 0;
  max-width: 620px;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.primary-btn,
.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-size: .85rem;
  font-weight: 700;
}

.primary-btn {
  color: #050505;
  background: var(--text);
}

.ghost-btn {
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.035);
}

.hero-sketch {
  width: 100%;
  min-width: 0;
  filter: drop-shadow(0 20px 60px rgba(0,0,0,.45));
}

.hero-sketch svg {
  width: 100%;
  overflow: visible;
}

.sketch-line,
.sketch-accent,
.chalk-arrow,
.chalk-loop {
  fill: none;
  stroke: rgba(255,255,255,.9);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sketch-year,
.sketch-label,
.chalk-title,
.chalk-text,
.chalk-note {
  font-family: "Caveat", "Comic Sans MS", cursive;
}

.sketch-year {
  fill: rgba(255,255,255,.55);
  font-size: 28px;
  font-weight: 700;
}

.sketch-label {
  font-size: 31px;
  font-weight: 700;
}

.node {
  stroke: #050505;
  stroke-width: 5;
}

.cyan { fill: var(--cyan); }
.yellow { fill: var(--yellow); }
.green { fill: var(--green); }
.blue { fill: var(--blue); }
.pink { fill: var(--pink); }

.cyan-fill, .cyan-text { fill: var(--cyan); color: var(--cyan); }
.yellow-fill, .yellow-text { fill: var(--yellow); color: var(--yellow); }
.green-fill, .green-text { fill: var(--green); color: var(--green); }
.blue-fill, .blue-text { fill: var(--blue); color: var(--blue); }
.pink-fill, .pink-text { fill: var(--pink); color: var(--pink); }

.cyan-stroke { stroke: var(--cyan) !important; }
.yellow-stroke { stroke: var(--yellow) !important; }
.green-stroke { stroke: var(--green) !important; }
.blue-stroke { stroke: var(--blue) !important; }
.pink-stroke { stroke: var(--pink) !important; }

.draw {
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: draw 1.8s cubic-bezier(.22,.9,.3,1) forwards;
}

.delay-1 { animation-delay: .2s; }
.delay-2 { animation-delay: .4s; }
.delay-3 { animation-delay: .6s; }
.delay-4 { animation-delay: .8s; }
.delay-5 { animation-delay: 1s; }

.pulse {
  opacity: 0;
  animation: pop .6s ease forwards;
}

.scroll-cue {
  position: absolute;
  left: 24px;
  bottom: 30px;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  text-decoration: none;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .13em;
}

.scroll-cue i {
  width: 70px;
  height: 1px;
  background: var(--line-strong);
  position: relative;
  overflow: hidden;
}

.scroll-cue i::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--text);
  transform: translateX(-100%);
  animation: sweep 2.2s ease-in-out infinite;
}

.journey {
  position: relative;
}

.timeline-shell {
  position: sticky;
  top: 66px;
  z-index: 30;
  width: 100%;
  padding: 28px 24px 24px;
  background: linear-gradient(to bottom, rgba(5,5,5,.97) 0%, rgba(5,5,5,.90) 72%, transparent 100%);
  backdrop-filter: blur(14px);
}

.timeline-track {
  position: relative;
  max-width: var(--max);
  min-height: 68px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: center;
}

.timeline-track::before {
  content: "";
  position: absolute;
  top: 28px;
  left: 7%;
  right: 7%;
  height: 1px;
  background: rgba(255,255,255,.22);
}

.timeline-progress {
  position: absolute;
  top: 27px;
  left: 7%;
  width: 0;
  max-width: 86%;
  height: 3px;
  background: var(--text);
  border-radius: 999px;
  transition: width .45s ease;
}

.timeline-point {
  appearance: none;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  cursor: pointer;
  display: grid;
  justify-items: center;
  gap: 6px;
  z-index: 1;
}

.timeline-point span {
  font-family: "Caveat", cursive;
  font-size: 1.3rem;
  font-weight: 700;
  transition: color .25s ease;
}

.timeline-point i {
  width: 11px;
  height: 11px;
  border: 2px solid rgba(255,255,255,.45);
  border-radius: 50%;
  background: var(--bg);
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
}

.timeline-point b {
  font-size: .66rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 700;
}

.timeline-point.is-active {
  color: var(--text);
}

.timeline-point.is-active i {
  transform: scale(1.35);
  background: var(--text);
  border-color: var(--text);
}

.stage {
  --stage-accent: var(--cyan);
  max-width: var(--max);
  min-height: 95svh;
  margin: 0 auto;
  padding: 105px 24px 140px;
  display: grid;
  grid-template-columns: minmax(0, .78fr) minmax(430px, 1.22fr);
  gap: 26px 54px;
  align-items: center;
  position: relative;
}

.stage[data-accent="yellow"] { --stage-accent: var(--yellow); }
.stage[data-accent="green"] { --stage-accent: var(--green); }
.stage[data-accent="blue"] { --stage-accent: var(--blue); }
.stage[data-accent="pink"] { --stage-accent: var(--pink); }

.stage::after {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.14), transparent);
}

.stage-copy h2 {
  margin: 16px 0 20px;
  font-size: clamp(2.5rem, 5vw, 5.1rem);
  letter-spacing: -.06em;
  line-height: .98;
}

.stage-copy h2 em {
  color: var(--stage-accent);
  font-style: normal;
}

.stage-copy > p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.75;
  max-width: 620px;
}

.stage-idea {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.12);
  display: flex;
  gap: 18px;
  align-items: baseline;
}

.stage-idea span {
  color: var(--muted);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .1em;
}

.stage-idea strong {
  color: var(--stage-accent);
  font-size: 1rem;
}

.blackboard {
  background:
    radial-gradient(circle at 50% 50%, rgba(255,255,255,.03), transparent 55%),
    #080809;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 30px;
  min-width: 0;
  padding: 24px 24px 10px;
  box-shadow:
    inset 0 1px rgba(255,255,255,.06),
    0 35px 90px rgba(0,0,0,.28);
  overflow: hidden;
  transition: transform .5s cubic-bezier(.2,.8,.2,1), border-color .4s ease;
}

.stage.is-current .blackboard {
  transform: translateY(-8px) rotate(-.2deg);
  border-color: color-mix(in srgb, var(--stage-accent) 45%, transparent);
}

.chalk-title {
  color: rgba(255,255,255,.72);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
}

.board-svg {
  width: 100%;
  height: auto;
}

.chalk-box,
.chalk-circle,
.harness-outer {
  fill: transparent;
  stroke: rgba(255,255,255,.55);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.chalk-text {
  fill: rgba(255,255,255,.93);
  font-size: 46px;
  font-weight: 700;
}

.chalk-note {
  fill: rgba(255,255,255,.72);
  font-size: 34px;
  font-weight: 600;
}

.chalk-arrow,
.chalk-loop {
  stroke-width: 4;
  vector-effect: non-scaling-stroke;
}

.example {
  grid-column: 2;
  padding: 22px 0 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 5px 20px;
  border-top: 1px dashed rgba(255,255,255,.15);
}

.example-tag {
  grid-column: 1 / -1;
}

.example h3 {
  margin: 12px 0 2px;
  font-size: 1.15rem;
  letter-spacing: -.02em;
}

.example p {
  grid-column: 1;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  max-width: 650px;
}

.example-result {
  grid-column: 2;
  grid-row: 2 / 4;
  align-self: center;
  color: var(--muted);
  font-size: .78rem;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 999px;
  padding: 9px 12px;
  white-space: nowrap;
}

.example-result strong {
  color: var(--stage-accent);
}

.harness-board {
  box-shadow:
    0 0 0 1px rgba(255,114,223,.04),
    0 30px 110px rgba(255,114,223,.04);
}

.comparison,
.key-idea,
.notes,
footer {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.comparison {
  padding-top: 150px;
  padding-bottom: 150px;
}

.comparison h2,
.key-copy h2 {
  max-width: 900px;
  margin: 16px 0 45px;
  font-size: clamp(2.8rem, 6vw, 5.8rem);
  line-height: .95;
  letter-spacing: -.06em;
}

.stack-list {
  border-top: 1px solid rgba(255,255,255,.16);
}

.stack-row {
  display: grid;
  grid-template-columns: 80px minmax(170px,.8fr) minmax(220px,1.2fr) minmax(160px,.8fr);
  gap: 24px;
  align-items: center;
  padding: 23px 0;
  border-bottom: 1px solid rgba(255,255,255,.12);
  transition: background .25s ease, padding .25s ease;
}

.stack-row:hover {
  padding-left: 14px;
  padding-right: 14px;
  background: rgba(255,255,255,.025);
}

.stack-row span {
  font-family: "Caveat", cursive;
  color: var(--muted);
  font-size: 1.4rem;
  font-weight: 700;
}

.stack-row b {
  font-size: 1rem;
}

.stack-row p {
  color: var(--muted);
  margin: 0;
}

.stack-row strong {
  text-align: right;
}

.stack-row[data-tone="cyan"] strong { color: var(--cyan); }
.stack-row[data-tone="yellow"] strong { color: var(--yellow); }
.stack-row[data-tone="green"] strong { color: var(--green); }
.stack-row[data-tone="blue"] strong { color: var(--blue); }
.stack-row[data-tone="pink"] strong { color: var(--pink); }

.key-idea {
  padding-top: 100px;
  padding-bottom: 120px;
}

.key-grid {
  display: grid;
  grid-template-columns: minmax(0,1.25fr) minmax(330px,.75fr);
  gap: 80px;
  align-items: end;
}

.key-copy p {
  max-width: 690px;
  margin: -20px 0 0;
  color: var(--muted);
  font-size: 1.2rem;
  line-height: 1.65;
}

.ladder {
  display: grid;
  gap: 7px;
}

.ladder > div {
  padding: 16px 18px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,.02);
}

.ladder > div span {
  color: var(--muted);
  font-size: .7rem;
}

.ladder > i {
  padding-left: 25px;
  color: var(--muted);
  font-style: normal;
}

.ladder .final-rung {
  border-color: rgba(255,114,223,.55);
  box-shadow: 0 0 60px rgba(255,114,223,.08);
}

.key-idea blockquote {
  margin: 110px 0 0;
  padding: 35px 0 35px 34px;
  border-left: 3px solid var(--pink);
  font-family: "Caveat", cursive;
  font-size: clamp(2.1rem, 4.8vw, 4.8rem);
  font-weight: 700;
  line-height: 1.03;
  color: rgba(255,255,255,.92);
}

.notes {
  padding-top: 80px;
  padding-bottom: 100px;
  border-top: 1px solid rgba(255,255,255,.12);
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: 80px;
}

.notes p {
  margin-top: 15px;
  color: var(--muted);
  line-height: 1.7;
  max-width: 720px;
}

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

.sources a {
  text-decoration: none;
  color: var(--muted);
  border-bottom: 1px solid rgba(255,255,255,.11);
  padding-bottom: 10px;
}

.sources a:hover {
  color: var(--text);
}

footer {
  padding-top: 38px;
  padding-bottom: 45px;
  border-top: 1px solid rgba(255,255,255,.12);
  display: flex;
  justify-content: space-between;
  gap: 30px;
}

footer p {
  color: var(--muted);
  font-size: .8rem;
  margin: 9px 0 0;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
}

.footer-links a {
  color: var(--muted);
  font-size: .78rem;
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--text);
}

@keyframes draw {
  to { stroke-dashoffset: 0; }
}

@keyframes pop {
  from { opacity: 0; transform: scale(.2); transform-origin: center; }
  to { opacity: 1; transform: scale(1); transform-origin: center; }
}

@keyframes sweep {
  0% { transform: translateX(-100%); }
  50%, 100% { transform: translateX(100%); }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    align-content: center;
    padding-top: 125px;
  }

  .hero-sketch {
    max-width: 690px;
    margin: -10px auto 0;
  }

  .stage {
    grid-template-columns: 1fr;
    padding-top: 90px;
  }

  .stage-copy {
    max-width: 760px;
  }

  .example {
    grid-column: 1;
  }

  .key-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .notes {
    grid-template-columns: 1fr;
    gap: 35px;
  }
}

@media (max-width: 680px) {
  .site-header {
    padding: 14px 16px;
  }

  .brand-sub { display: none; }

  .top-nav a {
    padding: 7px 9px;
    font-size: .68rem;
  }

  .hero {
    padding: 110px 18px 75px;
    min-height: auto;
  }

  .hero h1 {
    font-size: clamp(3.25rem, 16vw, 5.3rem);
  }

  .hero-sketch {
    margin-top: 15px;
  }

  .scroll-cue {
    position: static;
    margin-top: 20px;
  }

  .timeline-shell {
    top: 55px;
    padding: 21px 12px 18px;
    overflow-x: hidden;
  }

  .timeline-track {
    min-height: 60px;
  }

  .timeline-point span {
    font-size: 1.05rem;
  }

  .timeline-point b {
    font-size: .5rem;
    max-width: 62px;
    line-height: 1.1;
  }

  .timeline-track::before,
  .timeline-progress {
    top: 24px;
  }

  .stage {
    min-height: auto;
    padding: 76px 18px 105px;
    gap: 25px;
  }

  .stage-copy h2 {
    font-size: clamp(2.6rem, 13vw, 4.5rem);
  }

  .stage-idea {
    display: grid;
    gap: 6px;
  }

  .blackboard {
    margin-left: -6px;
    margin-right: -6px;
    padding: 18px 12px 4px;
    border-radius: 22px;
  }

  .chalk-title {
    padding-left: 8px;
  }

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

  .example-result {
    grid-column: 1;
    grid-row: auto;
    justify-self: start;
    margin-top: 12px;
  }

  .comparison,
  .key-idea,
  .notes,
  footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .comparison {
    padding-top: 100px;
    padding-bottom: 100px;
  }

  .stack-row {
    grid-template-columns: 54px 1fr;
    gap: 8px 14px;
  }

  .stack-row p {
    grid-column: 2;
  }

  .stack-row strong {
    grid-column: 2;
    text-align: left;
    font-size: .85rem;
  }

  .key-idea {
    padding-top: 70px;
  }

  .key-idea blockquote {
    margin-top: 80px;
    padding-left: 20px;
  }

  footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .draw {
    stroke-dasharray: none;
    stroke-dashoffset: 0;
  }
}