:root {
  --birch: #F4F0E8;
  --ink: #1F2D2A;
  --fjord: #3F7CAC;
  --lingon: #C74E4E;
  --lichen: #D8B94E;
  --mist: #D8DDD7;
  --pine: #6F8178;
  --progress: 0;
}

/* Typography compliance language: Inter 400/500 Inter** Inte explanatory notes. Optional micro-labels may use Condensed** Condense sparingly ledger-like tags Grotesk** Grotes headings labels */

@keyframes vellum-breathe {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes dust-settle {
  0% { opacity: .18; }
  100% { opacity: .32; }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--birch);
  color: var(--ink);
  font-family: Inter, system-ui, sans-serif;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0 32%, rgba(31,45,42,.16) 32.1%, transparent 32.25%),
    radial-gradient(circle at 18% 12%, rgba(216,185,78,.16), transparent 28%),
    radial-gradient(circle at 82% 68%, rgba(63,124,172,.12), transparent 32%);
  z-index: 0;
}

#particle-field {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

main, .study-index { position: relative; z-index: 2; }

.chapter {
  min-height: 112vh;
  position: relative;
  padding: 7vh clamp(1.5rem, 5vw, 5.5rem);
}

.scene {
  position: sticky;
  top: 0;
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(320px, 1.08fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 6rem);
}

.spine {
  position: absolute;
  left: 32%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(var(--mist), var(--pine), var(--mist));
  opacity: .75;
}

.spine::before,
.spine::after {
  content: "+";
  position: sticky;
  top: 13vh;
  display: block;
  transform: translateX(-50%);
  color: var(--pine);
  font-family: "IBM Plex Sans Condensed", sans-serif;
}

.spine span {
  position: sticky;
  top: 18vh;
  display: block;
  transform: translateX(-50%) rotate(-90deg);
  transform-origin: center;
  white-space: nowrap;
  color: var(--pine);
  font: 500 .78rem/1 "IBM Plex Sans Condensed", sans-serif;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.vellum {
  background: rgba(244,240,232,.66);
  border: 1px solid var(--mist);
  border-radius: 28px;
  backdrop-filter: blur(12px);
  box-shadow: 0 22px 70px rgba(31,45,42,.08);
  animation: vellum-breathe 12s ease-in-out infinite;
}

.copy {
  padding: clamp(1.5rem, 4vw, 3.5rem);
  max-width: 680px;
}

.foreground { transform: translate3d(0, calc(var(--local-progress, 0) * -32px), 0); }
.midground { transform: translate3d(0, calc(var(--local-progress, 0) * -16px), 0); }

.ledger-label {
  margin: 0 0 1.4rem;
  color: var(--pine);
  font: 500 .82rem/1 "IBM Plex Sans Condensed", sans-serif;
  letter-spacing: .24em;
  text-transform: uppercase;
}

h1, h2 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: -.055em;
  line-height: .92;
}

h1 { font-size: clamp(3rem, 9vw, 8rem); max-width: 10ch; }
h2 { font-size: clamp(2rem, 5vw, 4.5rem); max-width: 12ch; }
h2 em { color: var(--section-accent, var(--fjord)); font-style: normal; }

p {
  font-size: clamp(1rem, 1.4vw, 1.22rem);
  line-height: 1.65;
  color: color-mix(in srgb, var(--ink) 82%, var(--pine));
  max-width: 58ch;
}

.specimen {
  position: relative;
  height: 540px;
  perspective: 1100px;
}

.specimen-layer {
  position: absolute;
  left: 16%;
  right: 8%;
  top: 50%;
  height: 105px;
  border: 1px solid var(--mist);
  border-radius: 26px;
  background: rgba(244,240,232,.52);
  backdrop-filter: blur(10px);
  box-shadow: 0 26px 65px rgba(31,45,42,.08);
  transform: translateY(calc(-50% + var(--spread, 0px))) rotateX(58deg) rotateZ(-12deg);
  transition: transform .7s ease;
}

.specimen-layer span {
  position: absolute;
  left: 24px;
  top: 20px;
  font: 600 .82rem/1 "IBM Plex Sans Condensed", sans-serif;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--pine);
}

.layer-top { --spread: calc(var(--progress) * -125px); border-color: var(--fjord); }
.layer-components { --spread: calc(var(--progress) * -48px); }
.layer-origin { --spread: calc(var(--progress) * 30px); border-color: rgba(216,185,78,.8); }
.layer-license { --spread: calc(var(--progress) * 108px); }
.layer-risk { --spread: calc(var(--progress) * 186px); border-color: rgba(199,78,78,.72); }

.chapter-heading { align-self: center; }

.ledger {
  padding: 1.2rem;
  display: grid;
  gap: .65rem;
}

.ledger-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 1rem;
  align-items: center;
  min-height: 68px;
  padding: 0 1.2rem;
  border-radius: 18px;
  border: 1px solid rgba(216,221,215,.8);
  background: rgba(255,255,255,.22);
  cursor: pointer;
  transition: background .25s ease, border-color .25s ease, transform .25s ease;
}

.ledger-row:hover, .ledger-row.active {
  background: rgba(216,185,78,.18);
  border-color: var(--lichen);
  transform: translateX(10px);
}

.ledger-row b { font-family: "Space Grotesk", sans-serif; font-size: 1.2rem; }
.ledger-row span, .ledger-row i { font: 500 .82rem/1 "IBM Plex Sans Condensed", sans-serif; letter-spacing: .16em; text-transform: uppercase; color: var(--pine); font-style: normal; }

.marginalia {
  position: absolute;
  right: 8vw;
  bottom: 13vh;
  padding: 1rem 1.25rem;
  border: 1px solid var(--mist);
  border-radius: 999px 999px 999px 14px;
  background: rgba(244,240,232,.72);
  max-width: 330px;
  font-size: .95rem;
}

.dependency-map { width: 100%; min-height: 520px; overflow: visible; }
.thread { fill: none; stroke-width: 2; stroke-linecap: round; stroke-dasharray: 900; stroke-dashoffset: calc(900 - (900 * var(--local-progress, 0))); filter: drop-shadow(0 10px 20px rgba(31,45,42,.08)); }
.blue { stroke: var(--fjord); }
.yellow { stroke: var(--lichen); }
.pine { stroke: var(--pine); }
.map-pin circle { fill: var(--birch); stroke: var(--fjord); stroke-width: 2; }
.map-pin text { font: 600 16px "IBM Plex Sans Condensed", sans-serif; letter-spacing: .14em; text-transform: uppercase; fill: var(--pine); transform: translate(16px, 5px); }
.pin-a { transform: translate(90px, 370px); }
.pin-b { transform: translate(445px, 230px); }
.pin-c { transform: translate(505px, 150px); }
.pin-d { transform: translate(795px, 340px); }

.sheet-stack { position: relative; min-height: 520px; }
.sheet {
  position: absolute;
  width: min(520px, 88%);
  min-height: 185px;
  padding: 1.5rem;
  left: 8%;
  top: 14%;
  transform: translate(calc(var(--i) * 46px), calc(var(--i) * 72px - var(--local-progress, 0) * 42px)) rotate(calc(var(--i) * 2deg - 3deg));
}
.sheet:nth-child(1) { --i: 0; }
.sheet:nth-child(2) { --i: 1; }
.sheet:nth-child(3) { --i: 2; }
.sheet span { color: var(--pine); font: 500 .9rem "IBM Plex Sans Condensed", sans-serif; letter-spacing: .18em; }
.sheet b { display: block; margin-top: 1rem; font: 600 2rem "Space Grotesk", sans-serif; letter-spacing: -.04em; }

.risk-board { display: grid; gap: 1rem; }
.risk-line {
  position: relative;
  padding: 1.4rem 1.4rem 1.4rem 4rem;
  border-top: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
  background: rgba(244,240,232,.38);
}
.risk-line span { position: absolute; left: 1.3rem; top: 1.55rem; width: 18px; height: 18px; border-radius: 50%; background: var(--lingon); box-shadow: 0 0 0 12px rgba(199,78,78,.12); }
.risk-line.calm span { background: var(--fjord); box-shadow: 0 0 0 12px rgba(63,124,172,.12); }
.risk-line b { display: block; font: 600 1.5rem "Space Grotesk", sans-serif; }
.risk-line small { color: var(--pine); font: 500 .85rem "IBM Plex Sans Condensed", sans-serif; letter-spacing: .16em; text-transform: uppercase; }

.habit-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.habit-card { padding: 1.5rem; min-height: 260px; display: flex; flex-direction: column; justify-content: space-between; }
.habit-card b { font: 600 clamp(1.6rem, 3vw, 2.4rem) "Space Grotesk", sans-serif; letter-spacing: -.045em; }

.final-scene { grid-template-columns: 1fr 1fr; }
.desk-stack { min-height: 430px; position: relative; }
.desk-stack div {
  position: absolute;
  left: 10%;
  right: 4%;
  height: 90px;
  border: 1px solid var(--mist);
  border-radius: 20px;
  background: rgba(244,240,232,.58);
  transform: translateY(calc(var(--n) * 34px)) rotate(calc(var(--n) * -1.4deg));
  box-shadow: 0 18px 42px rgba(31,45,42,.07);
}
.desk-stack div:nth-child(1) { --n: 0; top: 140px; }
.desk-stack div:nth-child(2) { --n: 1; top: 160px; }
.desk-stack div:nth-child(3) { --n: 2; top: 180px; }
.desk-stack div:nth-child(4) { --n: 3; top: 200px; border-color: var(--fjord); }

.bookmark {
  display: inline-block;
  margin-top: 1rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--lichen);
  font-weight: 600;
}

.study-index {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  gap: 14px;
  z-index: 6;
}
.index-mark { position: relative; width: 18px; height: 18px; display: grid; place-items: center; text-decoration: none; }
.index-mark span { width: 8px; height: 8px; border-radius: 50%; background: var(--pine); opacity: .65; transition: all .25s ease; }
.index-mark.active span { height: 28px; border-radius: 999px; background: var(--fjord); opacity: 1; }
.index-mark.active::before { content: attr(data-label); position: absolute; right: 24px; top: 50%; transform: translateY(-50%); color: var(--pine); font: 500 .75rem "IBM Plex Sans Condensed", sans-serif; letter-spacing: .18em; text-transform: uppercase; }

.chapter .foreground, .chapter .midground, .ledger-row, .habit-card, .sheet, .risk-line {
  opacity: clamp(.28, calc(var(--local-progress, 0) * 2), 1);
}

@media (max-width: 860px) {
  .scene, .final-scene { grid-template-columns: 1fr; align-content: center; gap: 1rem; }
  .chapter { padding-inline: 1rem; }
  .spine { left: 1.4rem; opacity: .35; }
  .copy, .chapter-heading { margin-left: 2rem; }
  .specimen { height: 420px; }
  .habit-grid { grid-template-columns: 1fr; }
  .study-index { right: 10px; }
  .marginalia { position: static; margin-left: 2rem; }
}
*** Add File: sites/sbom.study-v1/script.js
const root = document.documentElement;
const chapters = Array.from(document.querySelectorAll('.chapter'));
const marks = Array.from(document.querySelectorAll('.index-mark'));
const canvas = document.getElementById('particle-field');
const ctx = canvas.getContext('2d');
const colors = ['#3F7CAC', '#D8B94E', '#6F8178', '#C74E4E', '#1F2D2A'];
let particles = [];
let width = 0;
let height = 0;
let scrollTarget = 0;
let scrollSmooth = 0;

function resizeCanvas() {
  const ratio = window.devicePixelRatio || 1;
  width = window.innerWidth;
  height = window.innerHeight;
  canvas.width = width * ratio;
  canvas.height = height * ratio;
  canvas.style.width = `${width}px`;
  canvas.style.height = `${height}px`;
  ctx.setTransform(ratio, 0, 0, ratio, 0, 0);
  const count = Math.max(70, Math.floor((width * height) / 14500));
  particles = Array.from({ length: count }, (_, index) => ({
    x: Math.random() * width,
    y: Math.random() * height,
    base: Math.random() * height,
    size: Math.random() * 2.2 + .8,
    speed: Math.random() * .18 + .035,
    drift: Math.random() * 1.6 + .35,
    color: colors[index % colors.length],
    label: Math.random() > .88 ? `v${1 + (index % 4)}.${index % 10}` : ''
  }));
}

function updateChapters() {
  const docHeight = document.body.scrollHeight - window.innerHeight;
  scrollTarget = docHeight > 0 ? window.scrollY / docHeight : 0;
  let active = chapters[0];

  chapters.forEach((chapter) => {
    const rect = chapter.getBoundingClientRect();
    const total = rect.height - window.innerHeight;
    const local = Math.min(1, Math.max(0, -rect.top / Math.max(1, total)));
    chapter.style.setProperty('--local-progress', local.toFixed(3));
    chapter.style.setProperty('--section-accent', chapter.dataset.accent || '#3F7CAC');
    if (rect.top <= window.innerHeight * .45 && rect.bottom >= window.innerHeight * .45) active = chapter;
  });

  marks.forEach((mark) => {
    mark.classList.toggle('active', mark.getAttribute('href') === `#${active.id}`);
  });
}

function drawParticles() {
  scrollSmooth += (scrollTarget - scrollSmooth) * .055;
  root.style.setProperty('--progress', scrollSmooth.toFixed(3));
  ctx.clearRect(0, 0, width, height);
  particles.forEach((p, index) => {
    const slowScroll = scrollSmooth * height * .15;
    const x = (p.x + Math.sin(Date.now() * 0.00018 * p.drift + index) * 18 + width) % width;
    const y = (p.base + Date.now() * 0.012 * p.speed - slowScroll + height) % height;
    ctx.globalAlpha = p.color === '#C74E4E' ? .32 : .22;
    ctx.fillStyle = p.color;
    if (p.label) {
      ctx.font = '500 10px IBM Plex Sans Condensed, sans-serif';
      ctx.fillText(p.label, x, y);
    } else if (index % 5 === 0) {
      ctx.fillRect(x, y, p.size * 4, 1.2);
    } else {
      ctx.beginPath();
      ctx.arc(x, y, p.size, 0, Math.PI * 2);
      ctx.fill();
    }
  });
  ctx.globalAlpha = 1;
  requestAnimationFrame(drawParticles);
}

document.querySelectorAll('.inspectable').forEach((row) => {
  row.addEventListener('mouseenter', () => {
    document.querySelectorAll('.inspectable').forEach((other) => other.classList.remove('active'));
    row.classList.add('active');
    const note = document.getElementById('inspect-note');
    if (note) note.textContent = row.dataset.note;
  });
});

marks.forEach((mark) => {
  mark.addEventListener('click', (event) => {
    event.preventDefault();
    const target = document.querySelector(mark.getAttribute('href'));
    if (target) target.scrollIntoView({ behavior: 'smooth' });
  });
});

window.addEventListener('resize', resizeCanvas);
window.addEventListener('scroll', updateChapters, { passive: true });

resizeCanvas();
updateChapters();
drawParticles();