:root {
  --ink: #081724;
  --ink-soft: #334656;
  --paper: #f7fbff;
  --white: #ffffff;
  --line: #cfdae4;
  --line-dark: #8fa2b3;
  --violet: #6254eb;
  --blue: #148bf2;
  --cyan: #00b9c5;
  --coral: #ff6b61;
  --lime: #d5f04a;
  --nav-height: 4.75rem;
  --max: 1240px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 1rem); }
body { margin: 0; min-width: 320px; background: var(--paper); line-height: 1.55; }
button, a { font: inherit; }
a { color: inherit; }
button { color: inherit; }
::selection { background: var(--lime); color: var(--ink); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; z-index: 100; top: .75rem; left: .75rem; transform: translateY(-150%);
  padding: .7rem 1rem; background: var(--lime); color: var(--ink); font-weight: 800;
}
.skip-link:focus { transform: none; }

.site-header {
  height: var(--nav-height); position: fixed; z-index: 50; inset: 0 0 auto;
  display: flex; align-items: center; justify-content: space-between; padding: 0 max(1.25rem, calc((100vw - var(--max)) / 2));
  color: white; border-bottom: 1px solid rgba(255,255,255,.13); transition: background .25s, backdrop-filter .25s;
}
.site-header.scrolled { background: rgba(8,23,36,.9); backdrop-filter: blur(16px); }
.brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; font-weight: 850; letter-spacing: -.02em; }
.brand-mark { display: flex; align-items: flex-end; gap: 2px; width: 25px; height: 25px; transform: rotate(-12deg); }
.brand-mark span { display: block; width: 7px; border-radius: 1px; }
.brand-mark span:nth-child(1) { height: 11px; background: var(--violet); }
.brand-mark span:nth-child(2) { height: 19px; background: var(--blue); }
.brand-mark span:nth-child(3) { height: 25px; background: var(--coral); }
.site-nav { display: flex; align-items: center; gap: 1.85rem; }
.site-nav a { position: relative; text-decoration: none; font-size: .87rem; font-weight: 700; color: rgba(255,255,255,.75); }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -.45rem; height: 2px; background: var(--lime); transition: right .2s; }
.site-nav a:hover, .site-nav a.active { color: white; }
.site-nav a:hover::after, .site-nav a.active::after { right: 0; }
.menu-button { display: none; border: 0; padding: .5rem; background: transparent; }
.menu-button > span:not(.sr-only) { display: block; width: 24px; height: 2px; margin: 5px 0; background: white; }

.hero {
  position: relative; min-height: min(900px, 100vh); overflow: hidden; color: white; background:
  radial-gradient(circle at 71% 30%, rgba(20,139,242,.28), transparent 31%),
  radial-gradient(circle at 93% 90%, rgba(255,107,97,.18), transparent 24%),
  var(--ink); display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(420px, .95fr);
  gap: 5vw; align-items: center; padding: calc(var(--nav-height) + 5rem) max(1.25rem, calc((100vw - var(--max)) / 2)) 6.5rem;
}
.hero-grid { position: absolute; inset: 0; opacity: .14; pointer-events: none; background-image: linear-gradient(rgba(255,255,255,.2) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.2) 1px, transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(to right, black, transparent 75%); }
.hero-copy, .hero-visual { position: relative; z-index: 2; }
.eyebrow, .section-kicker { margin: 0 0 1.5rem; text-transform: uppercase; letter-spacing: .15em; font-size: .73rem; font-weight: 850; }
.eyebrow { display: flex; align-items: center; gap: .75rem; color: #a9bed0; }
.eyebrow span { width: 1.8rem; height: 2px; background: var(--lime); }
.hero h1 { margin: 0; max-width: 760px; font-size: clamp(3.1rem, 6.2vw, 6.45rem); line-height: .91; letter-spacing: -.067em; font-weight: 850; }
.hero h1 em { font-family: Georgia, "Times New Roman", serif; font-weight: 400; color: var(--lime); }
.hero-deck { margin: 2rem 0 0; font-size: clamp(1rem, 1.6vw, 1.25rem); color: #bfd0de; }
.hero-deck strong:nth-child(1) { color: #b9afff; }
.hero-deck strong:nth-child(2) { color: #77c8ff; }
.hero-deck strong:nth-child(3) { color: #ff9a93; }
.hero-summary { max-width: 650px; margin: 1.4rem 0 0; font-size: 1.05rem; color: #a9bed0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 1rem; padding: .85rem 1.2rem; border: 1px solid rgba(255,255,255,.24); text-decoration: none; font-weight: 800; font-size: .9rem; transition: transform .2s, background .2s, color .2s; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--lime); color: var(--ink); border-color: var(--lime); }
.button-ghost:hover { background: rgba(255,255,255,.09); }
.author-block { max-width: 680px; margin-top: 2.2rem; padding-top: 1.25rem; border-top: 1px solid rgba(255,255,255,.15); }
.author-block p { margin: 0; font-size: .82rem; line-height: 1.7; color: #8fa8ba; }

.hero-visual { padding: 1.25rem; border: 1px solid rgba(255,255,255,.16); background: rgba(255,255,255,.035); box-shadow: 0 40px 90px rgba(0,0,0,.25); }
.ladder-label { margin: .3rem .25rem 1rem; color: #8199aa; font-size: .72rem; text-transform: uppercase; letter-spacing: .17em; font-weight: 850; }
.hero-level { position: relative; display: grid; grid-template-columns: 44px 1fr auto; gap: 1rem; align-items: center; padding: 1.25rem; background: #102838; border-left: 4px solid; }
.level-plausible { border-color: var(--violet); }
.level-controllable { border-color: var(--blue); margin-left: 5%; }
.level-actionable { border-color: var(--coral); margin-left: 10%; }
.level-index { align-self: start; color: #7990a1; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .72rem; }
.hero-level h2 { margin: 0; font-size: clamp(1.5rem, 2.4vw, 2.35rem); letter-spacing: -.045em; }
.hero-level p { margin: .2rem 0 0; color: #9fb4c3; font-size: .88rem; }
.level-proof { padding: .38rem .55rem; border: 1px solid rgba(255,255,255,.17); color: #c5d2dc; font-size: .66rem; text-transform: uppercase; letter-spacing: .08em; }
.level-connector { height: 2.1rem; margin-left: 2.7rem; border-left: 1px dashed #60798b; }
.level-connector span { display: block; width: 6px; height: 6px; transform: translate(-3.5px, .8rem) rotate(45deg); border-right: 1px solid #7994a7; border-bottom: 1px solid #7994a7; }
.signal { position: absolute; z-index: -1; border-radius: 50%; filter: blur(1px); }
.signal-a { width: 140px; height: 140px; top: -60px; right: -50px; border: 1px solid rgba(213,240,74,.55); }
.signal-b { width: 210px; height: 210px; bottom: -125px; left: -110px; border: 1px solid rgba(20,139,242,.45); }
.hero-foot { position: absolute; z-index: 2; bottom: 0; left: 0; right: 0; display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid rgba(255,255,255,.14); background: rgba(2,12,20,.45); }
.hero-foot span { padding: .9rem; border-right: 1px solid rgba(255,255,255,.11); text-align: center; color: #839bac; font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; }

.section { max-width: var(--max); margin: 0 auto; padding: 7.5rem 1.25rem; }
.section-kicker { color: var(--blue); }
.section-heading { display: grid; grid-template-columns: 1.15fr .85fr; gap: 10%; align-items: end; margin-bottom: 4rem; }
.section-heading h2, .citation-copy h2 { margin: 0; font-size: clamp(2.6rem, 5.2vw, 5.4rem); line-height: .93; letter-spacing: -.06em; }
.section-heading > p { max-width: 500px; margin: 0 0 .4rem; color: var(--ink-soft); font-size: 1.04rem; }

.intro-section { display: grid; grid-template-columns: 150px 1fr; gap: 5%; }
.statement { max-width: 1000px; }
.statement p { margin: 0; }
.statement-lead { color: var(--ink-soft); font-size: 1rem; }
.statement-old { margin-top: .8rem !important; font-size: clamp(2.25rem, 4.6vw, 4.8rem); line-height: 1.04; letter-spacing: -.055em; color: #8494a0; text-decoration: line-through; text-decoration-thickness: 2px; text-decoration-color: var(--coral); }
.statement-turn { margin: 1.1rem 0 !important; font-family: Georgia, serif; font-style: italic; font-size: 1.4rem; color: var(--coral); }
.statement-new { max-width: 1050px; font-size: clamp(2.55rem, 5.2vw, 5.7rem); line-height: .98; letter-spacing: -.06em; font-weight: 850; }
.principles { grid-column: 2; display: grid; grid-template-columns: repeat(3,1fr); margin-top: 4rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.principles > div { padding: 1.5rem; border-right: 1px solid var(--line); }
.principles > div:last-child { border: 0; }
.principles span { display: block; color: var(--violet); font-weight: 850; }
.principles p { margin: .6rem 0 0; color: var(--ink-soft); font-size: .88rem; }

.framework-section { max-width: none; background: white; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding-left: max(1.25rem, calc((100vw - var(--max)) / 2)); padding-right: max(1.25rem, calc((100vw - var(--max)) / 2)); }
.capability-list { border-top: 1px solid var(--ink); }
.capability { --accent: var(--violet); display: grid; grid-template-columns: 100px 1.5fr 1fr; gap: 3rem; align-items: start; padding: 2.5rem 0; border-bottom: 1px solid var(--line); }
.capability[data-accent="blue"] { --accent: var(--blue); }
.capability[data-accent="coral"] { --accent: var(--coral); }
.capability-number { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--line-dark); }
.capability-topline { display: flex; align-items: center; gap: .7rem; }
.capability-topline span { display: grid; place-items: center; width: 1.8rem; height: 1.8rem; background: var(--accent); color: white; font-weight: 900; }
.capability-topline p { margin: 0; text-transform: uppercase; letter-spacing: .11em; font-size: .69rem; color: var(--ink-soft); font-weight: 800; }
.capability h3 { margin: .8rem 0 .5rem; font-size: clamp(2.35rem, 4vw, 4.4rem); line-height: 1; letter-spacing: -.055em; }
.capability-definition { max-width: 650px; margin: 0; color: var(--ink-soft); }
.capability-metrics { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1.3rem; }
.capability-metrics span { padding: .35rem .6rem; background: color-mix(in srgb, var(--accent) 8%, white); border: 1px solid color-mix(in srgb, var(--accent) 32%, white); font-size: .72rem; font-weight: 750; }
.capability-test { margin: 2.4rem 0 0; padding-left: 1.2rem; border-left: 2px solid var(--accent); color: var(--ink-soft); font-size: .9rem; }

.matrix-section { max-width: none; margin: 0; padding-left: max(1.25rem, calc((100vw - var(--max)) / 2)); padding-right: max(1.25rem, calc((100vw - var(--max)) / 2)); color: white; background: var(--ink); }
.matrix-section .section-kicker { color: var(--lime); }
.matrix-section .section-heading > p { color: #a6bac8; }
.matrix-wrap { display: grid; grid-template-columns: 1fr 300px; gap: 1rem; }
.matrix { display: grid; grid-template-columns: 1.05fr repeat(4, 1fr); border-top: 1px solid #506778; border-left: 1px solid #506778; }
.matrix > * { min-height: 92px; border-right: 1px solid #506778; border-bottom: 1px solid #506778; }
.matrix-corner, .matrix-head, .matrix-row-head { padding: 1rem; }
.matrix-corner { display: flex; flex-direction: column; justify-content: space-between; color: #7f96a7; font-size: .68rem; text-transform: uppercase; letter-spacing: .1em; }
.matrix-corner b { color: #c2d0da; }
.matrix-head { display: flex; flex-direction: column; justify-content: space-between; color: white; font-weight: 850; }
.matrix-head span { color: #7f96a7; font: .7rem ui-monospace, monospace; }
.matrix-row-head { display: flex; align-items: center; gap: .8rem; font-weight: 850; }
.matrix-row-head span { display: grid; place-items: center; width: 2rem; height: 2rem; background: var(--violet); }
.matrix-row-head.phys span { background: var(--blue); }
.matrix-row-head.act span { background: var(--coral); }
.matrix-cell { appearance: none; padding: 1rem; border-top: 0; border-left: 0; border-color: #506778; background: #102738; color: #a8bbc8; text-align: left; cursor: pointer; transition: background .18s, color .18s, transform .18s; }
.matrix-cell:hover, .matrix-cell:focus-visible, .matrix-cell.active { outline: none; background: var(--lime); color: var(--ink); transform: translate(-3px,-3px); box-shadow: 3px 3px 0 var(--blue); }
.matrix-inspector { display: flex; flex-direction: column; min-height: 100%; padding: 1.5rem; background: var(--lime); color: var(--ink); }
.matrix-inspector > p:first-child { margin: 0; font-size: .68rem; text-transform: uppercase; letter-spacing: .12em; font-weight: 850; }
.matrix-inspector h3 { margin: auto 0 1rem; font-size: 1.75rem; line-height: 1.05; letter-spacing: -.04em; }
.inspector-line { width: 3rem; height: 3px; background: var(--ink); }
.matrix-inspector > p:not(:first-child) { margin: 1.2rem 0; font-size: .92rem; }
.matrix-inspector small { margin-top: auto; padding-top: 1rem; border-top: 1px solid rgba(8,23,36,.25); font-size: .72rem; font-weight: 700; }

.progression-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.progression-card { position: relative; min-height: 460px; padding: 1.5rem; overflow: hidden; border: 1px solid var(--line); background: white; }
.progression-icon { position: absolute; top: -1.3rem; right: -.35rem; font-size: 8rem; line-height: 1; font-weight: 900; opacity: .08; }
.p-icon { color: var(--violet); }.c-icon { color: var(--blue); }.a-icon { color: var(--coral); }
.progression-label { margin: 0 0 5rem; color: var(--ink-soft); font-size: .74rem; text-transform: uppercase; letter-spacing: .11em; font-weight: 850; }
.progression-card ol { list-style: none; margin: 0; padding: 0; }
.progression-card li { display: flex; gap: .9rem; align-items: baseline; padding: 1.2rem 0; border-top: 1px solid var(--line); font-weight: 780; }
.progression-card li span { color: var(--line-dark); font: .68rem ui-monospace, monospace; }
.domains { display: grid; grid-template-columns: .95fr 1.05fr; gap: 4rem; margin-top: 1rem; padding: 3rem; background: #eaf2f7; }
.domains-copy h3 { margin: 0; font-size: clamp(2rem, 3vw, 3.3rem); line-height: 1; letter-spacing: -.05em; }
.domain-list { border-top: 1px solid var(--line-dark); }
.domain-list > div { display: flex; justify-content: space-between; gap: 1rem; padding: .9rem 0; border-bottom: 1px solid var(--line); }
.domain-list span { font-weight: 850; }
.domain-list p { margin: 0; color: var(--ink-soft); font-size: .82rem; text-align: right; }

.library-section {
  max-width: none; margin: 0;
  padding-left: max(1.25rem, calc((100vw - var(--max)) / 2));
  padding-right: max(1.25rem, calc((100vw - var(--max)) / 2));
  background: white;
}
.library-heading { display: grid; grid-template-columns: 1fr auto; gap: 4rem; align-items: end; margin-bottom: 3.5rem; }
.library-heading h2 { margin: 0; font-size: clamp(2.8rem, 5.6vw, 5.8rem); line-height: .92; letter-spacing: -.065em; }
.library-summary { max-width: 300px; padding-left: 1.5rem; border-left: 3px solid var(--coral); }
.library-summary strong { display: block; font-size: 1.6rem; letter-spacing: -.04em; }
.library-summary p { margin: .35rem 0 0; color: var(--ink-soft); font-size: .9rem; }
.library-shell { border: 1px solid var(--line-dark); }
.library-controls { padding: 1.5rem; background: #eaf2f7; border-bottom: 1px solid var(--line-dark); }
.search-field > label, .filter-grid label > span {
  display: block; margin-bottom: .45rem; color: var(--ink-soft);
  font-size: .875rem; font-weight: 800;
}
.search-input-wrap { position: relative; display: flex; align-items: center; }
.search-input-wrap > span { position: absolute; left: 1rem; color: var(--blue); font-size: 1.55rem; font-weight: 900; pointer-events: none; }
.search-input-wrap input {
  width: 100%; height: 3.5rem; padding: 0 3.4rem 0 3rem; border: 1px solid var(--line-dark);
  border-radius: 0; outline: 0; color: var(--ink); background: white; font-size: 1rem;
  transition: border .18s, box-shadow .18s;
}
.search-input-wrap input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(20,139,242,.14); }
.search-input-wrap kbd { position: absolute; right: 1rem; padding: .18rem .45rem; border: 1px solid var(--line); background: var(--paper); color: var(--ink-soft); font: .75rem ui-monospace, monospace; }
.filter-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: .8rem; margin-top: 1rem; }
.filter-grid select {
  width: 100%; min-height: 2.8rem; padding: .6rem 2rem .6rem .7rem; border: 1px solid var(--line-dark);
  border-radius: 0; color: var(--ink); background: white; font-size: .875rem; cursor: pointer;
}
.active-filter-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.25rem; }
.level-shortcuts { display: flex; flex-wrap: wrap; gap: .45rem; }
.level-shortcut, .clear-filters {
  border: 1px solid var(--line-dark); padding: .45rem .75rem; background: transparent;
  color: var(--ink-soft); font-size: .82rem; font-weight: 800; cursor: pointer;
}
.level-shortcut:hover, .level-shortcut:focus-visible, .level-shortcut.active { border-color: var(--ink); background: var(--ink); color: white; }
.level-shortcut.plausible.active { border-color: var(--violet); background: var(--violet); }
.level-shortcut.controllable.active { border-color: var(--blue); background: var(--blue); }
.level-shortcut.actionable.active { border-color: var(--coral); background: var(--coral); }
.level-shortcut.cross.active { border-color: #495b69; background: #495b69; }
.clear-filters { border-color: transparent; text-decoration: underline; text-underline-offset: 3px; }
.clear-filters:hover { color: var(--blue); }
.library-status { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding: 1rem 1.5rem; border-bottom: 1px solid var(--line); }
.library-status p { margin: 0; font-size: .9rem; }
.library-status span { color: var(--ink-soft); font-size: .8rem; }
.paper-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.paper-card {
  --card-accent: #667987; position: relative; display: flex; flex-direction: column; min-height: 390px;
  padding: 1.5rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: white;
}
.paper-card:nth-child(3n) { border-right: 0; }
.paper-card::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 4px; background: var(--card-accent); transform: scaleY(0); transform-origin: bottom; transition: transform .2s; }
.paper-card:hover::before { transform: scaleY(1); }
.paper-card[data-capability="Plausible"] { --card-accent: var(--violet); }
.paper-card[data-capability="Controllable"] { --card-accent: var(--blue); }
.paper-card[data-capability="Actionable"] { --card-accent: var(--coral); }
.paper-topline { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.paper-index { color: var(--line-dark); font: .72rem ui-monospace, monospace; }
.paper-level { padding: .25rem .5rem; border: 1px solid color-mix(in srgb, var(--card-accent) 40%, white); color: var(--card-accent); font-size: .7rem; font-weight: 850; text-transform: uppercase; letter-spacing: .07em; }
.paper-card h3 { margin: 1.8rem 0 .7rem; font-size: 1.28rem; line-height: 1.24; letter-spacing: -.025em; }
.paper-card h3 a { text-decoration: none; }
.paper-card h3 a:hover { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.paper-authors { margin: 0; color: var(--ink-soft); font-size: .8rem; line-height: 1.5; }
.paper-direction { margin: 1.2rem 0 0; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .8rem; }
.paper-direction strong { display: block; margin-bottom: .25rem; color: var(--ink); font-size: .69rem; text-transform: uppercase; letter-spacing: .08em; }
.paper-tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: 1rem; }
.paper-tags span { padding: .25rem .45rem; background: #edf3f7; color: #405565; font-size: .7rem; font-weight: 720; }
.paper-footer { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-top: auto; padding-top: 1.3rem; }
.paper-meta { color: var(--ink-soft); font: .72rem ui-monospace, monospace; }
.paper-links { display: flex; gap: .45rem; }
.paper-links a { padding: .4rem .55rem; border: 1px solid var(--line-dark); text-decoration: none; font-size: .75rem; font-weight: 800; }
.paper-links a:hover { border-color: var(--ink); background: var(--ink); color: white; }
.library-empty { padding: 5rem 1.5rem; text-align: center; }
.library-empty > span { color: var(--coral); font-size: 3rem; }
.library-empty h3 { margin: .5rem 0; font-size: 1.5rem; }
.library-empty p { margin: 0 0 1.2rem; color: var(--ink-soft); }
.library-empty button { border: 0; padding: .65rem 1rem; background: var(--ink); color: white; font-weight: 800; cursor: pointer; }
.library-more { display: flex; justify-content: center; padding: 1.5rem; }
.button-library { border-color: var(--ink); background: var(--ink); color: white; cursor: pointer; }
.button-library:hover { background: var(--blue); border-color: var(--blue); }
.button-library[hidden] { display: none; }

.challenges-section { max-width: none; margin: 0; padding-left: max(1.25rem, calc((100vw - var(--max)) / 2)); padding-right: max(1.25rem, calc((100vw - var(--max)) / 2)); background: #e9f1f6; }
.challenge-grid { display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid var(--line-dark); border-left: 1px solid var(--line-dark); }
.challenge { min-height: 245px; padding: 1.5rem; border-right: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); background: rgba(255,255,255,.28); transition: background .2s, transform .2s; }
.challenge:hover { background: white; transform: translateY(-4px); }
.challenge > span { font: .72rem ui-monospace, monospace; color: var(--blue); }
.challenge h3 { margin: 3.2rem 0 .6rem; font-size: 1.45rem; letter-spacing: -.03em; }
.challenge p { margin: 0; color: var(--ink-soft); font-size: .9rem; }

.takeaway-section { max-width: none; margin: 0; padding: 0; color: white; background: linear-gradient(135deg, var(--violet), var(--blue) 55%, var(--cyan)); }
.takeaway { max-width: var(--max); margin: auto; padding: 7.5rem 1.25rem; }
.takeaway .section-kicker { color: white; opacity: .72; }
.takeaway h2 { margin: 0; font-size: clamp(3.2rem, 7vw, 7.7rem); line-height: .86; letter-spacing: -.07em; }
.takeaway h2 span { color: var(--lime); font-family: Georgia, serif; font-weight: 400; font-style: italic; }
.takeaway > p:last-child { max-width: 580px; margin: 2.2rem 0 0 auto; color: #dceaff; font-size: 1.08rem; }

.citation-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 5rem; align-items: start; }
.citation-copy p:last-child { max-width: 430px; color: var(--ink-soft); }
.citation-box { position: relative; padding: 1.5rem 1.5rem 4.5rem; color: #d7e5ee; background: var(--ink); box-shadow: 12px 12px 0 var(--lime); }
.citation-box pre { margin: 0; overflow: auto; }
.citation-box code { font: .8rem/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.copy-button { position: absolute; right: 1rem; bottom: 1rem; display: flex; gap: 1rem; align-items: center; border: 0; padding: .7rem .9rem; background: var(--lime); color: var(--ink); font-weight: 850; cursor: pointer; }

footer { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 2rem max(1.25rem, calc((100vw - var(--max)) / 2)); color: #9db1bf; background: #041019; font-size: .78rem; }
footer a { color: white; text-decoration: none; font-weight: 750; }
footer p { margin: 0; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 960px) {
  .hero { min-height: auto; grid-template-columns: 1fr; padding-top: 9rem; }
  .hero-copy { max-width: 760px; }
  .hero-visual { max-width: 700px; margin: 0 auto; width: 100%; }
  .hero-foot { position: relative; grid-column: 1; margin: 4rem -1.25rem -6.5rem; }
  .section-heading, .citation-section { grid-template-columns: 1fr; gap: 2rem; }
  .section-heading > p { max-width: 660px; }
  .intro-section { grid-template-columns: 1fr; }
  .principles { grid-column: 1; }
  .capability { grid-template-columns: 70px 1fr; gap: 1.5rem; }
  .capability-test { grid-column: 2; margin-top: 0; }
  .matrix-wrap { grid-template-columns: 1fr; }
  .matrix-inspector { min-height: 230px; }
  .progression-grid { grid-template-columns: 1fr; }
  .progression-card { min-height: auto; }
  .progression-label { margin-bottom: 3rem; }
  .domains { grid-template-columns: 1fr; gap: 2rem; }
  .library-heading { grid-template-columns: 1fr; gap: 2rem; }
  .library-summary { max-width: 500px; }
  .filter-grid { grid-template-columns: repeat(3, 1fr); }
  .paper-grid { grid-template-columns: repeat(2, 1fr); }
  .paper-card:nth-child(3n) { border-right: 1px solid var(--line); }
  .paper-card:nth-child(2n) { border-right: 0; }
  .challenge-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 720px) {
  :root { --nav-height: 4.2rem; }
  .site-header { padding: 0 1.1rem; }
  .menu-button { display: block; }
  .site-nav { position: absolute; top: var(--nav-height); left: 0; right: 0; display: none; align-items: stretch; flex-direction: column; gap: 0; padding: .5rem 1.1rem 1rem; background: rgba(8,23,36,.97); border-bottom: 1px solid rgba(255,255,255,.15); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: .75rem 0; }
  .hero { padding-top: 7.5rem; }
  .hero h1 { font-size: clamp(3rem, 15vw, 5rem); }
  .hero-level { grid-template-columns: 34px 1fr; }
  .level-proof { grid-column: 2; justify-self: start; }
  .level-controllable, .level-actionable { margin-left: 0; }
  .hero-foot { grid-template-columns: repeat(2,1fr); }
  .section { padding-top: 5.5rem; padding-bottom: 5.5rem; }
  .section-heading { margin-bottom: 2.7rem; }
  .principles { grid-template-columns: 1fr; }
  .principles > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .capability { grid-template-columns: 1fr; }
  .capability-number { display: none; }
  .capability-test { grid-column: 1; }
  .matrix-wrap { overflow-x: auto; margin-right: -1.25rem; padding-right: 1.25rem; }
  .matrix { min-width: 780px; }
  .matrix-inspector { min-width: calc(100vw - 2.5rem); }
  .domains { padding: 1.5rem; }
  .domain-list > div { display: block; }
  .domain-list p { margin-top: .25rem; text-align: left; }
  .library-controls { padding: 1rem; }
  .filter-grid { grid-template-columns: 1fr 1fr; }
  .active-filter-row, .library-status { align-items: flex-start; flex-direction: column; }
  .paper-grid { grid-template-columns: 1fr; }
  .paper-card, .paper-card:nth-child(2n), .paper-card:nth-child(3n) { border-right: 0; }
  .paper-card { min-height: 350px; }
  .challenge-grid { grid-template-columns: 1fr; }
  .challenge { min-height: 210px; }
  .takeaway h2 { font-size: clamp(3rem, 16vw, 5.5rem); }
  .citation-box { box-shadow: 7px 7px 0 var(--lime); }
  footer { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-visual { padding: .65rem; }
  .hero-level { padding: 1rem; }
  .hero-level h2 { font-size: 1.65rem; }
  .statement-old { font-size: 2rem; }
  .statement-new { font-size: 2.5rem; }
}