:root {
  --ink: #121116;
  --muted: #5f5c68;
  --line: #e6e1ef;
  --paper: #fbfaf8;
  --white: #ffffff;
  --wash: #f4f1f8;
  --purple: #6042a6;
  --purple-dark: #33204f;
  --shadow: 0 24px 80px rgba(38, 29, 63, .09);
  --radius: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(96, 66, 166, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96, 66, 166, .045) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px;
  font-family: ui-serif, Georgia, "Times New Roman", serif;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 70% 20%, rgba(96, 66, 166, .08), transparent 34rem);
}
a { color: inherit; text-decoration: none; }
p { color: var(--muted); font-family: "Avenir Next", "Segoe UI", sans-serif; line-height: 1.7; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(251, 250, 248, .82);
  border-bottom: 1px solid rgba(230, 225, 239, .8);
}
.nav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-weight: 700;
  letter-spacing: .02em;
}
.mark {
  width: 34px;
  height: 34px;
  border: 1px solid var(--purple);
  display: grid;
  place-items: center;
  color: var(--purple);
}
.mark::after { content: ""; width: 12px; height: 12px; border: 1px solid currentColor; transform: rotate(45deg); }
.nav-links { display: flex; align-items: center; gap: 20px; font: 500 13px/1 "Avenir Next", "Segoe UI", sans-serif; color: #403c49; }
.nav-links a { padding: 8px 0; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--purple); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  font: 650 13px/1 "Avenir Next", "Segoe UI", sans-serif;
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
}
.button:hover { transform: translateY(-2px); background: var(--purple-dark); border-color: var(--purple-dark); }
.button.secondary { background: transparent; color: var(--ink); border-color: var(--line); }
.button.secondary:hover { border-color: var(--purple); color: var(--purple); background: var(--white); }
main { position: relative; }
.section { max-width: 1180px; margin: 0 auto; padding: 100px 24px; }
.hero { min-height: 86vh; display: grid; align-items: center; grid-template-columns: minmax(0, 1fr) 420px; gap: 72px; }
.eyebrow {
  color: var(--purple);
  font: 700 12px/1 "Avenir Next", "Segoe UI", sans-serif;
  letter-spacing: .16em;
  text-transform: uppercase;
}
h1, h2, h3 { margin: 0; font-weight: 500; letter-spacing: 0; }
h1 { margin-top: 18px; font-size: clamp(3.5rem, 8vw, 7.7rem); line-height: .9; max-width: 930px; }
h2 { font-size: clamp(2.4rem, 5vw, 5rem); line-height: .98; max-width: 920px; }
h3 { font-size: 1.45rem; line-height: 1.15; }
.lead { font-size: 1.22rem; max-width: 720px; margin: 28px 0 0; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 34px; }
.blueprint-panel {
  min-height: 520px;
  border: 1px solid rgba(96, 66, 166, .22);
  background:
    linear-gradient(rgba(96, 66, 166, .13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96, 66, 166, .13) 1px, transparent 1px),
    rgba(255, 255, 255, .72);
  background-size: 26px 26px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.blueprint-panel::before, .blueprint-panel::after {
  content: "";
  position: absolute;
  border: 1px solid var(--purple);
  opacity: .55;
}
.blueprint-panel::before { width: 220px; height: 220px; left: 54px; top: 68px; }
.blueprint-panel::after { width: 190px; height: 92px; right: 48px; bottom: 76px; }
.line-drawing { position: absolute; inset: 0; }
.line-drawing i { position: absolute; display: block; background: var(--purple); opacity: .42; }
.line-drawing i:nth-child(1) { width: 1px; height: 380px; left: 50%; top: 42px; }
.line-drawing i:nth-child(2) { height: 1px; width: 300px; left: 80px; top: 178px; }
.line-drawing i:nth-child(3) { height: 1px; width: 220px; right: 72px; top: 292px; }
.line-drawing i:nth-child(4) { width: 1px; height: 190px; right: 138px; top: 180px; }
.caption {
  position: absolute;
  left: 28px;
  bottom: 28px;
  font: 650 12px/1.5 "Avenir Next", "Segoe UI", sans-serif;
  color: var(--purple-dark);
  text-transform: uppercase;
  letter-spacing: .14em;
}
.sequence { display: grid; grid-template-columns: 1fr; border-top: 1px solid var(--line); }
.step {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.step strong { color: var(--purple); font: 700 13px/1 "Avenir Next", "Segoe UI", sans-serif; letter-spacing: .12em; }
.step p { margin: 0; font-size: clamp(1.45rem, 3vw, 2.45rem); line-height: 1.15; color: var(--ink); font-family: ui-serif, Georgia, serif; }
.split { display: grid; grid-template-columns: .92fr 1.08fr; gap: 72px; align-items: start; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.card { background: rgba(255,255,255,.72); padding: 30px; min-height: 240px; }
.card p { margin-bottom: 0; }
.diagram { border: 1px solid var(--line); background: rgba(255,255,255,.68); padding: 34px; }
.diagram-row { display: grid; grid-template-columns: 1fr 38px 1fr; align-items: center; gap: 16px; margin: 16px 0; }
.node { border: 1px solid rgba(96,66,166,.35); padding: 16px; font: 650 13px/1.35 "Avenir Next", "Segoe UI", sans-serif; background: var(--white); min-height: 72px; display: flex; align-items: center; }
.arrow { height: 1px; background: var(--purple); position: relative; }
.arrow::after { content: ""; position: absolute; right: -1px; top: -4px; width: 8px; height: 8px; border-top: 1px solid var(--purple); border-right: 1px solid var(--purple); transform: rotate(45deg); }
.dark-band { background: #17141d; color: var(--white); }
.dark-band p, .dark-band .lead { color: #c9c1d6; }
.dark-band .section { padding-top: 110px; padding-bottom: 110px; }
.service-list { display: grid; grid-template-columns: 1.2fr .8fr; gap: 50px; align-items: end; }
.service-item { display: grid; grid-template-columns: 110px 1fr; gap: 24px; padding: 32px 0; border-bottom: 1px solid rgba(255,255,255,.16); }
.service-item span { color: #9d85d7; font: 700 13px/1 "Avenir Next", "Segoe UI", sans-serif; letter-spacing: .14em; }
.page-hero { padding-top: 92px; padding-bottom: 70px; }
.measure { max-width: 760px; }
.tool { display: grid; grid-template-columns: .9fr 1.1fr; gap: 44px; align-items: start; }
.control-panel, .result-panel {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.78);
  padding: 30px;
  box-shadow: var(--shadow);
}
label { display: block; font: 650 13px/1.2 "Avenir Next", "Segoe UI", sans-serif; margin: 22px 0 8px; }
input, textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  padding: 13px 14px;
  font: 500 15px/1.4 "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
}
input[type="range"] { accent-color: var(--purple); padding: 0; }
textarea { min-height: 140px; resize: vertical; }
.metric { font-size: clamp(3rem, 7vw, 6rem); line-height: .9; margin: 10px 0; }
.small { font: 600 12px/1.6 "Avenir Next", "Segoe UI", sans-serif; color: var(--muted); }
.score-bar { height: 10px; background: var(--wash); border: 1px solid var(--line); margin: 18px 0; }
.score-fill { height: 100%; width: 0; background: var(--purple); transition: width .35s ease; }
.question { padding: 18px 0; border-bottom: 1px solid var(--line); }
.site-footer { border-top: 1px solid var(--line); padding: 46px 24px; font: 500 13px/1.6 "Avenir Next", "Segoe UI", sans-serif; color: var(--muted); }
.footer-inner { max-width: 1180px; margin: 0 auto; display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.mobile-toggle { display: none; }
:focus-visible { outline: 3px solid rgba(96,66,166,.35); outline-offset: 3px; }

@media (max-width: 920px) {
  .mobile-toggle { display: inline-flex; }
  .nav { align-items: flex-start; }
  .nav-links { display: none; position: absolute; left: 24px; right: 24px; top: 70px; padding: 18px; border: 1px solid var(--line); background: var(--white); flex-direction: column; align-items: flex-start; box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .hero, .split, .tool, .service-list { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 72px; }
  .blueprint-panel { min-height: 360px; }
  .grid { grid-template-columns: 1fr; }
  .step { grid-template-columns: 1fr; gap: 10px; }
  .section { padding: 72px 20px; }
  .service-item { grid-template-columns: 1fr; gap: 12px; }
}