/* ==========================================================================
   The AI Engineering Skills Map — design system
   Palette: warm paper, ink, and four territory accents.
   Type: Fraunces (display) · Inter (text) · IBM Plex Mono (data)
   ========================================================================== */

@font-face {
  font-family: "Fraunces";
  src: url("../fonts/Fraunces-var.ttf") format("truetype-variations");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("../fonts/Inter-var.ttf") format("truetype-variations");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("../fonts/IBMPlexMono-Regular.ttf") format("truetype");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("../fonts/IBMPlexMono-Medium.ttf") format("truetype");
  font-weight: 500;
  font-display: swap;
}

:root {
  --paper: #F6F1E7;
  --paper-2: #EFE7D8;
  --paper-3: #E7DCC8;
  --ink: #1C1913;
  --ink-2: #4A443A;
  --ink-3: #8A8172;
  --line: rgba(28, 25, 19, 0.16);
  --line-strong: rgba(28, 25, 19, 0.34);

  --c-build: #E4572E;
  --c-fundamentals: #2A9D8F;
  --c-agents: #D9A62E;
  --c-shape: #7C6AEF;

  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", -apple-system, "Helvetica Neue", sans-serif;
  --mono: "Plex Mono", "SF Mono", Menlo, monospace;

  --gutter: clamp(1.25rem, 4vw, 4rem);
  --maxw: 1240px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.45, 0, 0.15, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
html:focus-within { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
::selection { background: var(--c-build); color: var(--paper); }

/* paper grain */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2000;
  opacity: 0.5;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}

/* ---------- shared ---------- */
.kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: flex;
  align-items: center;
  gap: 0.6em;
}
.kicker .tick {
  width: 1.6em; height: 1px;
  background: var(--ink);
  display: inline-block;
}
.section-head { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.section-title {
  font-family: var(--serif);
  font-variation-settings: "opsz" 100, "SOFT" 30, "WONK" 0;
  font-weight: 560;
  font-size: clamp(2.4rem, 5.4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 1.1rem 0 1.4rem;
}
.section-title em {
  font-style: italic;
  font-variation-settings: "opsz" 100, "SOFT" 60, "WONK" 1;
  font-weight: 480;
}
.section-lede {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 44ch;
}
.btn {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.85em 1.5em;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  transition: transform 0.35s var(--ease-out), background 0.35s, color 0.35s, border-color 0.35s;
}
.btn:hover { transform: translateY(-2px); }
.btn-solid { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-solid:hover { background: var(--c-build); border-color: var(--c-build); }
.btn-ghost:hover { border-color: var(--ink); }

/* reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out); transition-delay: var(--rd, 0s); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- progress + nav ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 1200;
  background: transparent;
}
.scroll-progress span {
  display: block; height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--c-build), var(--c-fundamentals), var(--c-agents), var(--c-shape));
  transform-origin: 0 50%;
  transform: scaleX(0);
}
.site-nav {
  position: fixed; top: 3px; left: 0; right: 0; z-index: 1100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem var(--gutter);
  transition: background 0.4s, box-shadow 0.4s, backdrop-filter 0.4s;
}
.site-nav.is-scrolled {
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
}
.nav-brand { display: flex; align-items: center; gap: 0.65rem; }
.nav-compass { width: 30px; height: 30px; color: var(--ink); }
.nav-brand-text {
  font-family: var(--serif); font-weight: 600; font-size: 1.05rem; line-height: 1.05;
  display: flex; flex-direction: column;
}
.nav-brand-text em {
  font-family: var(--mono); font-style: normal; font-size: 0.58rem;
  letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-3);
}
.nav-links { display: flex; align-items: center; gap: 1.6rem; }
.nav-links a {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-2); position: relative; padding: 0.3em 0;
  transition: color 0.3s;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%;
  background: currentColor; transform: scaleX(0); transform-origin: 0 50%;
  transition: transform 0.35s var(--ease-out);
}
.nav-links a:hover, .nav-links a.is-active { color: var(--ink); }
.nav-links a:hover::after, .nav-links a.is-active::after { transform: scaleX(1); }
.nav-links .nav-cta {
  border: 1px solid var(--line-strong); border-radius: 999px; padding: 0.55em 1.1em;
  color: var(--ink);
}
.nav-links .nav-cta::after { display: none; }
.nav-links .nav-cta:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.nav-menu-btn { display: none; }

/* mobile menu */
.mobile-menu {
  position: fixed; inset: 0; z-index: 1150; background: var(--ink); color: var(--paper);
  display: flex; align-items: center; justify-content: center;
  padding-top: 4.5rem;
  opacity: 0; pointer-events: none; transition: opacity 0.45s var(--ease-soft);
}
.mobile-menu.is-open { opacity: 1; pointer-events: auto; }
.mobile-menu nav { display: flex; flex-direction: column; gap: 1.1rem; max-height: calc(100svh - 5.5rem); overflow-y: auto; }
.mobile-menu-close {
  position: absolute; top: 1rem; right: var(--gutter);
  width: 44px; height: 44px; display: none;
  align-items: center; justify-content: center;
  color: var(--paper); border: 1px solid rgba(246,241,231,0.35); border-radius: 50%;
}
.mobile-menu-close svg { width: 18px; height: 18px; }
@media (max-width: 760px) { .mobile-menu-close { display: flex; } }
.mobile-menu a {
  font-family: var(--serif); font-size: clamp(1.8rem, 7vw, 2.6rem); font-weight: 520;
  display: flex; align-items: baseline; gap: 1rem;
  opacity: 0; transform: translateY(18px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
.mobile-menu.is-open a { opacity: 1; transform: none; }
.mobile-menu a i {
  font-family: var(--mono); font-style: normal; font-size: 0.7rem; letter-spacing: 0.2em;
  color: var(--c-agents);
}

/* ---------- hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 7rem var(--gutter) 4rem;
  overflow: hidden;
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-inner { position: relative; z-index: 2; max-width: var(--maxw); margin: 0 auto; width: 100%; }
.hero-kicker { color: var(--ink-2); margin-bottom: 2.2rem; }
.hero-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(3.2rem, 11.5vw, 10.5rem);
  line-height: 0.94;
  letter-spacing: -0.025em;
  font-variation-settings: "opsz" 144, "SOFT" 20, "WONK" 0;
  margin-left: -0.04em;
}
.ht-line { display: block; overflow: hidden; }
.ht-word { display: inline-block; transform: translateY(110%); animation: htIn 1.1s var(--ease-out) forwards; }
.ht-line:nth-child(1) .ht-word { animation-delay: 0.15s; }
.ht-line:nth-child(2) .ht-word { animation-delay: 0.3s; }
.ht-line:nth-child(3) .ht-word { animation-delay: 0.45s; }
.ht-line:nth-child(3) .ht-word + .ht-word { animation-delay: 0.55s; }
@keyframes htIn { to { transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { .ht-word { animation: none; transform: none; } }
.ht-accent {
  color: var(--c-build);
  font-variation-settings: "opsz" 144, "SOFT" 50, "WONK" 1;
  font-style: italic;
  font-weight: 460;
}
.ht-italic { font-style: italic; font-weight: 430; font-variation-settings: "opsz" 144, "SOFT" 70, "WONK" 1; }
.hero-dek {
  margin-top: 2.2rem; max-width: 46ch;
  font-size: clamp(1.05rem, 1.7vw, 1.35rem); line-height: 1.55; color: var(--ink-2);
}
.hero-attribution {
  margin-top: 3.2rem;
  display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; flex-wrap: wrap;
}
.hero-byline { display: flex; align-items: center; gap: 1rem; }
.byline-avatar {
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--ink); color: var(--paper);
  display: grid; place-items: center;
  font-family: var(--serif); font-weight: 600; font-size: 1.05rem;
}
.byline-text { font-size: 0.92rem; line-height: 1.45; color: var(--ink-2); }
.byline-text strong { color: var(--ink); }
.byline-text em { font-style: normal; color: var(--ink-3); font-size: 0.85rem; }
.hero-scrollcue {
  display: inline-flex; align-items: center; gap: 0.8rem;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-2);
}
.hero-scrollcue svg { width: 18px; height: 18px; animation: cueBob 2.2s ease-in-out infinite; }
@keyframes cueBob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(6px); } }
.hero-coords {
  position: absolute; left: var(--gutter); right: var(--gutter); bottom: 1.4rem; z-index: 2;
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.18em; color: var(--ink-3);
  text-transform: uppercase;
}

/* ---------- provenance ---------- */
.provenance { padding: clamp(6rem, 12vw, 10rem) 0 clamp(4rem, 8vw, 7rem); }
.prov-grid {
  max-width: var(--maxw); margin: 3.5rem auto 0; padding: 0 var(--gutter);
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem;
}
.prov-card {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  padding: 2rem 1.8rem 4.4rem;
  background: var(--paper-2);
  overflow: hidden;
  transition: transform 0.5s var(--ease-out), box-shadow 0.5s;
}
.prov-card:hover { transform: translateY(-6px); box-shadow: 0 24px 48px -24px rgba(28,25,19,0.35); }
.prov-card::after {
  content: ""; position: absolute; inset: auto -20% -55% -20%; height: 120%;
  background: radial-gradient(closest-side, var(--ac, var(--c-build)) 0%, transparent 70%);
  opacity: 0.12; pointer-events: none;
}
.prov-card:nth-child(1) { --ac: var(--c-build); }
.prov-card:nth-child(2) { --ac: var(--c-fundamentals); }
.prov-card:nth-child(3) { --ac: var(--c-shape); }
.prov-value {
  font-family: var(--serif); font-weight: 480;
  font-size: clamp(3.4rem, 6vw, 5.2rem); line-height: 1;
  font-variation-settings: "opsz" 144, "SOFT" 40, "WONK" 0;
  letter-spacing: -0.02em;
}
.prov-card[data-text] .prov-value {
  font-size: clamp(2.5rem, 4.2vw, 3.7rem);
  font-style: italic;
  font-variation-settings: "opsz" 144, "SOFT" 60, "WONK" 1;
}
.prov-card h3 { font-family: var(--sans); font-weight: 600; font-size: 1.02rem; margin: 1.1rem 0 0.6rem; }
.prov-card p { font-size: 0.92rem; color: var(--ink-2); line-height: 1.6; }
.prov-tag {
  position: absolute; left: 1.8rem; bottom: 1.6rem;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.22em; color: var(--ink-3);
}
.prov-footnote {
  max-width: var(--maxw); margin: 2.6rem auto 0; padding: 0 var(--gutter);
  font-size: 0.95rem; color: var(--ink-3);
}
.prov-footnote em { color: var(--ink-2); }

/* ---------- premise ---------- */
.premise { padding: clamp(4rem, 9vw, 8rem) 0; border-top: 1px solid var(--line); }
.premise-grid {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter);
  display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(2.5rem, 6vw, 6rem);
  align-items: center;
}
.premise-copy p { margin-top: 1.2rem; color: var(--ink-2); font-size: 1.05rem; line-height: 1.7; }
.premise-copy p strong { color: var(--ink); }
.premise-figure {
  border: 1px solid var(--line-strong); border-radius: 18px;
  background: var(--paper-2); padding: 2rem 1.8rem 1.4rem;
}
.analogy { display: flex; flex-direction: column; gap: 1.05rem; }
.analogy-row { display: grid; grid-template-columns: 9.5rem 1fr; gap: 1rem; align-items: center; }
.analogy-label { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-2); text-align: right; }
.analogy-bar { position: relative; height: 34px; background: var(--paper-3); border-radius: 8px; overflow: hidden; }
.analogy-fill {
  position: absolute; inset: 0 auto 0 0; width: calc(var(--fill) * 100%);
  background: var(--ink); border-radius: 8px;
  transform: scaleX(0); transform-origin: 0 50%;
  transition: transform 1.2s var(--ease-soft);
}
.analogy-fill-thin { background: var(--c-build); }
.is-in .analogy-fill { transform: scaleX(1); }
.analogy-bar em {
  position: absolute; left: 0.8rem; top: 50%; transform: translateY(-50%);
  font-style: normal; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em;
  color: var(--paper); mix-blend-mode: difference; white-space: nowrap;
}
.analogy-divider {
  display: flex; align-items: center; gap: 1rem; margin: 0.4rem 0;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3);
}
.analogy-divider::before, .analogy-divider::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.premise-figure figcaption { margin-top: 1.4rem; font-size: 0.82rem; color: var(--ink-3); }

/* ---------- atlas spine ---------- */
.atlas { padding: clamp(4rem, 9vw, 8rem) 0 0; border-top: 1px solid var(--line); }
.atlas-stage { position: relative; }
.atlas-sticky {
  position: sticky; top: 0; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  max-width: var(--maxw); margin: 0 auto; padding: 5rem var(--gutter) 2rem;
}
.atlas-svg { width: 100%; height: auto; color: var(--ink-2); }
.atlas-contour-rect { color: var(--ink-3); opacity: 0.5; }
.atlas-route {
  stroke: var(--ink); stroke-width: 1.6; stroke-dasharray: 6 7;
  opacity: 0.75;
}
.atlas-node-dot { fill: var(--paper); stroke-width: 2; }
.atlas-node-halo { opacity: 0.16; }
.atlas-node-label {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  fill: var(--ink-2); text-transform: uppercase;
}
.atlas-node-index { font-family: var(--mono); font-size: 10px; fill: var(--ink-3); letter-spacing: 0.1em; }
.atlas-rose { color: var(--ink-2); }
.atlas-rose-n { font-family: var(--mono); font-size: 12px; fill: var(--ink-2); }
.atlas-readout {
  margin-top: 1.6rem; max-width: 560px;
  border-left: 2px solid var(--ac, var(--c-build));
  padding-left: 1.4rem;
  transition: border-color 0.5s;
}
.atlas-readout-index { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.22em; color: var(--ac, var(--c-build)); }
.atlas-readout-name {
  font-family: var(--serif); font-weight: 560; font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  line-height: 1.1; margin: 0.5rem 0 0.35rem;
  font-variation-settings: "opsz" 60, "SOFT" 30, "WONK" 0;
}
.atlas-readout-tag { color: var(--ink-2); font-size: 0.98rem; }
.atlas-readout-link {
  display: inline-flex; align-items: center; gap: 0.55rem; margin-top: 1rem;
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink); border-bottom: 1px solid var(--line-strong); padding-bottom: 0.3em;
  transition: color 0.3s, border-color 0.3s;
}
.atlas-readout-link svg { width: 15px; height: 15px; transition: transform 0.35s var(--ease-out); }
.atlas-readout-link:hover { color: var(--ac, var(--c-build)); border-color: currentColor; }
.atlas-readout-link:hover svg { transform: translateX(4px); }
.atlas-steps { position: relative; margin-top: -100svh; pointer-events: none; }
.atlas-step { height: 100svh; }

/* ---------- territory chapters ---------- */
.chapter { border-top: 1px solid var(--line); position: relative; }
.chapter-head {
  max-width: var(--maxw); margin: 0 auto; padding: clamp(4rem, 8vw, 7rem) var(--gutter) 0;
  display: grid; grid-template-columns: auto 1fr; gap: clamp(1.5rem, 4vw, 4rem); align-items: start;
}
.chapter-index {
  font-family: var(--serif); font-weight: 400; font-style: italic;
  font-size: clamp(3.6rem, 8vw, 7rem); line-height: 0.9;
  color: var(--ac);
  font-variation-settings: "opsz" 144, "SOFT" 80, "WONK" 1;
}
.chapter-kicker { color: var(--ac); }
.chapter-title {
  font-family: var(--serif); font-weight: 560;
  font-size: clamp(2.2rem, 4.6vw, 3.8rem); line-height: 1.04; letter-spacing: -0.015em;
  margin: 1rem 0 0.6rem;
  font-variation-settings: "opsz" 100, "SOFT" 30, "WONK" 0;
  max-width: 16ch;
}
.chapter-tagline { font-size: 1.1rem; color: var(--ink-2); font-style: italic; font-family: var(--serif); }
.chapter-coords {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.2em; color: var(--ink-3);
  margin-top: 1.2rem; text-transform: uppercase;
}
.chapter-body {
  max-width: var(--maxw); margin: 0 auto; padding: 2.6rem var(--gutter) clamp(4rem, 8vw, 6.5rem);
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(2rem, 5vw, 5rem);
}
.chapter-summary { font-size: 1.08rem; line-height: 1.75; color: var(--ink-2); }
.chapter-summary strong { color: var(--ink); }
.pullquote {
  margin-top: 2.4rem; padding: 1.8rem 0 0; border-top: 2px solid var(--ac);
}
.pullquote p {
  font-family: var(--serif); font-weight: 480; font-style: italic;
  font-size: clamp(1.5rem, 2.6vw, 2.1rem); line-height: 1.25;
  font-variation-settings: "opsz" 60, "SOFT" 60, "WONK" 1;
}
.pullquote p::before { content: "“"; color: var(--ac); }
.pullquote p::after { content: "”"; color: var(--ac); }
.pullquote cite {
  display: block; margin-top: 1rem; font-family: var(--mono); font-style: normal;
  font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3);
}
.chapter-compass {
  margin-top: 2.6rem; border: 1px dashed var(--line-strong); border-radius: 14px; padding: 1.4rem 1.5rem;
  background: color-mix(in srgb, var(--ac) 6%, var(--paper));
}
.chapter-compass h4 {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--ac); margin-bottom: 0.9rem; font-weight: 500;
}
.chapter-compass li { font-size: 0.95rem; color: var(--ink-2); line-height: 1.6; list-style: none; padding-left: 1.4rem; position: relative; }
.chapter-compass li + li { margin-top: 0.6rem; }
.chapter-compass li::before { content: "◇"; position: absolute; left: 0; color: var(--ac); font-size: 0.8em; top: 0.25em; }

/* clusters */
.clusters { display: flex; flex-direction: column; gap: 1rem; }
.cluster {
  border: 1px solid var(--line-strong); border-radius: 16px; background: var(--paper-2);
  overflow: hidden;
  transition: border-color 0.4s, box-shadow 0.4s;
}
.cluster.is-open { border-color: var(--ac); box-shadow: 0 20px 44px -26px rgba(28,25,19,0.4); }
.cluster-toggle {
  width: 100%; display: flex; align-items: center; gap: 1rem;
  padding: 1.25rem 1.4rem; text-align: left;
}
.cluster-swatch {
  flex: none; width: 34px; height: 34px; border-radius: 10px;
  background: var(--ac); color: var(--paper);
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.05em;
}
.cluster-heading { flex: 1; min-width: 0; }
.cluster-heading h3 { font-family: var(--serif); font-weight: 580; font-size: 1.25rem; line-height: 1.15; }
.cluster-heading p { font-size: 0.85rem; color: var(--ink-3); margin-top: 0.2rem; }
.cluster-chevron { flex: none; width: 16px; height: 16px; transition: transform 0.45s var(--ease-out); color: var(--ink-2); }
.cluster.is-open .cluster-chevron { transform: rotate(180deg); color: var(--ac); }
.cluster-panel {
  display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.55s var(--ease-soft);
}
.cluster.is-open .cluster-panel { grid-template-rows: 1fr; }
.cluster-panel-inner { overflow: hidden; }
.cluster-items {
  display: flex; flex-wrap: wrap; gap: 0.55rem;
  padding: 0 1.4rem 1.5rem;
}
.chip {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.03em;
  padding: 0.55em 1em; border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  transition: background 0.3s, color 0.3s, border-color 0.3s, transform 0.3s var(--ease-out);
  cursor: default;
}
.chip:hover { background: var(--ac); border-color: var(--ac); color: var(--paper); transform: translateY(-2px); }

/* chapter route connector */
.chapter-route {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter) clamp(3rem, 6vw, 5rem);
  display: flex; align-items: center; gap: 1rem;
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3);
}
.chapter-route::after { content: ""; flex: 1; height: 1px; background: linear-gradient(90deg, var(--ac), transparent); }

/* ---------- hazard ---------- */
.hazard {
  background: var(--ink); color: var(--paper);
  padding: clamp(6rem, 12vw, 10rem) var(--gutter);
  position: relative; overflow: hidden;
}
.hazard-inner { max-width: 880px; margin: 0 auto; position: relative; z-index: 2; }
.kicker-hazard { color: var(--c-agents); }
.kicker-hazard .tick { background: var(--c-agents); }
.hazard-title {
  font-family: var(--serif); font-weight: 540;
  font-size: clamp(2.6rem, 6vw, 5rem); line-height: 1.0; letter-spacing: -0.015em;
  margin: 1.4rem 0 2.4rem;
  font-variation-settings: "opsz" 144, "SOFT" 30, "WONK" 0;
}
.hazard-title em { font-style: italic; color: var(--c-agents); font-variation-settings: "opsz" 144, "SOFT" 60, "WONK" 1; }
.hazard-quote p {
  font-family: var(--serif); font-weight: 460; font-style: italic;
  font-size: clamp(1.4rem, 2.8vw, 2.2rem); line-height: 1.35;
  border-left: 3px solid var(--c-agents); padding-left: 1.6rem;
  font-variation-settings: "opsz" 60, "SOFT" 50, "WONK" 1;
}
.hazard-quote mark {
  background: var(--c-agents); color: var(--ink);
  padding: 0.05em 0.25em; border-radius: 6px;
  font-style: normal; font-weight: 560;
}
.hazard-body { margin-top: 2.2rem; color: rgba(246, 241, 231, 0.75); font-size: 1.05rem; line-height: 1.7; max-width: 56ch; }
.hazard-body a { color: var(--c-agents); border-bottom: 1px solid currentColor; }
.hazard-stripes {
  position: absolute; top: 0; bottom: 0; right: -4rem; width: 220px;
  background: repeating-linear-gradient(-45deg, var(--c-agents) 0 14px, transparent 14px 34px);
  opacity: 0.14;
  transform: skewX(-8deg);
}

/* ---------- mindset ---------- */
.mindset { padding: clamp(6rem, 12vw, 10rem) 0; }
.mindset-inner { max-width: 880px; margin: 0 auto; padding: 0 var(--gutter); text-align: center; }
.mindset-inner .kicker { justify-content: center; }
.mindset-lede { margin: 1.6rem auto 0; font-size: clamp(1.05rem, 1.7vw, 1.3rem); line-height: 1.65; color: var(--ink-2); max-width: 52ch; }
.mindset-loop {
  margin: 3rem auto; display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 0.9rem;
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.14em; text-transform: uppercase;
}
.mindset-loop span { border: 1px solid var(--line-strong); border-radius: 999px; padding: 0.7em 1.4em; background: var(--paper-2); }
.mindset-loop i { font-style: normal; color: var(--c-build); }
.mindset-note { font-size: 0.98rem; color: var(--ink-2); max-width: 56ch; margin: 0 auto; line-height: 1.7; }
.mindset-note strong { color: var(--ink); }

/* ---------- assessment ---------- */
.assessment { padding: clamp(5rem, 10vw, 9rem) 0; border-top: 1px solid var(--line); background: var(--paper-2); }
.assess-grid {
  max-width: var(--maxw); margin: 3.5rem auto 0; padding: 0 var(--gutter);
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.assess-group { border: 1px solid var(--line-strong); border-radius: 16px; background: var(--paper); margin-bottom: 1.1rem; overflow: hidden; }
.assess-group-head {
  display: flex; align-items: center; gap: 1rem; padding: 1.15rem 1.4rem;
  border-bottom: 1px solid var(--line);
}
.assess-group-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--ac); flex: none; }
.assess-group-head h3 { font-family: var(--serif); font-weight: 580; font-size: 1.15rem; flex: 1; }
.assess-group-count { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; color: var(--ink-3); }
.assess-items { padding: 0.9rem 1.4rem 1.3rem; display: flex; flex-direction: column; gap: 0.55rem; }
.assess-item {
  display: flex; align-items: flex-start; gap: 0.85rem;
  padding: 0.7rem 0.9rem; border-radius: 10px; cursor: pointer;
  transition: background 0.3s;
  font-size: 0.95rem; line-height: 1.5; color: var(--ink-2);
}
.assess-item:hover { background: color-mix(in srgb, var(--ac) 8%, var(--paper)); }
.assess-item input { position: absolute; opacity: 0; pointer-events: none; }
.assess-box {
  flex: none; width: 20px; height: 20px; margin-top: 0.15rem;
  border: 1.5px solid var(--line-strong); border-radius: 6px;
  display: grid; place-items: center;
  transition: background 0.25s, border-color 0.25s, transform 0.25s var(--ease-out);
}
.assess-box svg { width: 12px; height: 12px; opacity: 0; transform: scale(0.4); transition: opacity 0.25s, transform 0.3s var(--ease-out); }
.assess-item input:checked ~ .assess-box { background: var(--ac); border-color: var(--ac); transform: scale(1.05); }
.assess-item input:checked ~ .assess-box svg { opacity: 1; transform: scale(1); }
.assess-item input:checked ~ span { color: var(--ink); }
.assess-item input:focus-visible ~ .assess-box { outline: 2px solid var(--ac); outline-offset: 2px; }

.assess-sticky { position: sticky; top: 6.5rem; }
.assess-radar-wrap {
  position: relative; border: 1px solid var(--line-strong); border-radius: 18px;
  background: var(--paper); padding: 1.4rem;
}
.assess-score {
  position: absolute; inset: 0; display: grid; place-content: center; text-align: center; pointer-events: none;
}
.assess-score span {
  font-family: var(--serif); font-weight: 500; font-size: clamp(2.6rem, 4vw, 3.6rem); line-height: 1;
  font-variation-settings: "opsz" 100, "SOFT" 40, "WONK" 0;
}
.assess-score em { font-family: var(--mono); font-style: normal; font-size: 0.62rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-3); margin-top: 0.4rem; }
.assess-verdict { margin-top: 1.4rem; }
.assess-verdict h3 { font-family: var(--serif); font-weight: 580; font-size: 1.5rem; }
.assess-verdict p { margin-top: 0.4rem; font-size: 0.94rem; color: var(--ink-2); line-height: 1.6; }
.assess-bars { margin-top: 1.4rem; display: flex; flex-direction: column; gap: 0.7rem; }
.assess-bar-row { display: grid; grid-template-columns: 7.5rem 1fr 2.6rem; gap: 0.8rem; align-items: center; }
.assess-bar-row label { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); }
.assess-bar-track { height: 8px; border-radius: 99px; background: var(--paper-3); overflow: hidden; }
.assess-bar-fill { height: 100%; border-radius: 99px; width: 0%; transition: width 0.7s var(--ease-soft); }
.assess-bar-row output { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-3); text-align: right; }
.assess-actions { display: flex; gap: 0.8rem; margin-top: 1.6rem; flex-wrap: wrap; }
.assess-hint { margin-top: 1rem; font-size: 0.78rem; color: var(--ink-3); }
.assess-copy-flash { color: var(--c-fundamentals) !important; }

/* radar */
.radar-grid { fill: none; stroke: var(--line); }
.radar-axis { stroke: var(--line); }
.radar-label { font-family: var(--mono); font-size: 8px; letter-spacing: 0.06em; fill: var(--ink-2); text-transform: uppercase; }
.radar-shape { fill: rgba(228, 87, 46, 0.18); stroke: var(--c-build); stroke-width: 2; stroke-linejoin: round; transition: all 0.6s var(--ease-soft); }
.radar-vertex { transition: all 0.6s var(--ease-soft); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: clamp(4rem, 8vw, 6rem) var(--gutter) 2rem; }
.footer-grid {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: auto 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start;
}
.footer-brand { display: flex; align-items: center; gap: 1rem; }
.footer-brand p { font-family: var(--serif); font-weight: 560; font-size: 1.2rem; line-height: 1.15; }
.footer-colophon, .footer-signoff { font-size: 0.92rem; color: var(--ink-2); line-height: 1.7; max-width: 40ch; }
.footer-signoff em { color: var(--ink); }
.footer-base {
  max-width: var(--maxw); margin: 3.5rem auto 0; padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3);
}
.footer-base a:hover { color: var(--ink); }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  .premise-grid { grid-template-columns: 1fr; }
  .chapter-body { grid-template-columns: 1fr; }
  .assess-grid { grid-template-columns: 1fr; }
  .assess-sticky { position: static; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-menu-btn {
    display: flex; flex-direction: column; gap: 6px; padding: 10px;
  }
  .nav-menu-btn span { width: 24px; height: 1.5px; background: var(--ink); transition: transform 0.4s var(--ease-out), opacity 0.3s, background 0.3s; }
  .nav-menu-btn.is-open span { background: var(--paper); }
  .nav-menu-btn.is-open span:nth-child(1) { transform: translateY(3.75px) rotate(45deg); }
  .nav-menu-btn.is-open span:nth-child(2) { transform: translateY(-3.75px) rotate(-45deg); }
  .prov-grid { grid-template-columns: 1fr; }
  .chapter-head { grid-template-columns: 1fr; gap: 0.8rem; }
  .hero-attribution { flex-direction: column; align-items: flex-start; }
  .analogy-row { grid-template-columns: 1fr; gap: 0.4rem; }
  .analogy-label { text-align: left; }
  .atlas-sticky { padding-top: 4.5rem; }
  .atlas-readout { max-width: none; }
  .assess-bar-row { grid-template-columns: 6rem 1fr 2.4rem; }
}