/* 01 Tokens & Reset */
:root {
  --color-ink: #17191c; --color-graphite: #252a30; --color-cobalt: #31546d;
  --color-mineral: #58756d; --color-brass: #be944f; --color-oxide: #955a49;
  --color-sand: #ded3bf; --color-paper: #f5f2ea; --color-surface: #fcfaf6;
  --color-line: #c7cecb; --color-muted: #697175; --color-fog: #e3e8e6; --color-white: #fff;
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --text-xs: .75rem; --text-sm: .875rem; --text-base: 1rem; --text-lg: clamp(1.05rem, 1.5vw, 1.25rem);
  --text-h3: clamp(1.25rem, 2vw, 1.65rem); --text-h2: clamp(2rem, 4vw, 3.65rem); --text-h1: clamp(2.6rem, 6.3vw, 6rem);
  --space-1: .5rem; --space-2: .75rem; --space-3: 1rem; --space-4: 1.5rem; --space-5: 2rem; --space-6: 3rem; --space-7: clamp(4rem, 8vw, 7.5rem);
  --container: 1400px; --container-narrow: 1120px; --border: 1px solid var(--color-line);
  --radius-sm: 2px; --radius-md: 6px; --shadow: 0 18px 50px rgba(23,25,28,.08); --transition: 220ms ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--color-ink); background: var(--color-surface); font-family: var(--font-sans); line-height: 1.6; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }
a { color: inherit; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.08; letter-spacing: -.025em; }

/* 02 Base */
h1 { max-width: 1040px; margin-bottom: var(--space-4); font-size: var(--text-h1); font-weight: 630; }
h2 { margin-bottom: var(--space-4); font-size: var(--text-h2); font-weight: 620; }
h3 { font-size: var(--text-h3); }
p { color: #464d50; }
.eyebrow, .section-kicker span, .domain-index, .profile-type { margin-bottom: var(--space-3); color: var(--color-cobalt); font-size: var(--text-xs); font-weight: 750; letter-spacing: .13em; text-transform: uppercase; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: .8rem 1.2rem; border: 1px solid transparent; border-radius: var(--radius-sm); font-size: .88rem; font-weight: 700; text-decoration: none; transition: background var(--transition), color var(--transition), border var(--transition); }
.button-primary { background: var(--color-graphite); color: var(--color-white); }
.button-primary:hover { background: var(--color-cobalt); }
.button-secondary { border-color: var(--color-graphite); background: transparent; }
.button-secondary:hover { background: var(--color-paper); }

/* 03 Accessibility */
.skip-link { position: fixed; z-index: 100; top: .5rem; left: .5rem; padding: .7rem 1rem; background: var(--color-white); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--color-brass); outline-offset: 3px; }
section[id], main[id] { scroll-margin-top: 92px; }
[hidden] { display: none !important; }

/* 04 Layout */
.container { width: min(calc(100% - 3rem), var(--container)); margin-inline: auto; }
.section { padding-block: var(--space-7); }
.section-compact { padding-block: clamp(3rem, 6vw, 5rem); }
.section-heading { max-width: 850px; margin-bottom: clamp(2rem, 5vw, 4.5rem); }
.section-heading > p:last-child { max-width: 720px; font-size: var(--text-lg); }
.section-kicker { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; border-bottom: var(--border); }
.section-kicker h2 { margin-bottom: 1rem; font-size: clamp(1.7rem, 3vw, 2.7rem); }
.split-layout { display: grid; grid-template-columns: minmax(0, .75fr) minmax(0, 1.25fr); gap: clamp(2rem, 7vw, 8rem); }

/* 05 Header */
.site-header { position: sticky; z-index: 50; top: 0; border-bottom: var(--border); background: rgba(252,250,246,.96); backdrop-filter: blur(12px); }
.header-inner { display: flex; min-height: 78px; align-items: center; justify-content: space-between; gap: 1.5rem; }
.brand { flex: 0 1 290px; }
.primary-nav { display: flex; align-items: center; gap: clamp(.7rem, 1.5vw, 1.4rem); }
.primary-nav a { font-size: .78rem; font-weight: 650; text-decoration: none; white-space: nowrap; }
.primary-nav a:hover { color: var(--color-cobalt); }
.nav-action { padding: .6rem .8rem; border: 1px solid var(--color-graphite); }
.menu-toggle { display: none; width: 48px; height: 48px; padding: 12px; border: var(--border); background: transparent; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--color-ink); }

/* 06 Hero */
.hero { height: auto; padding: clamp(4rem, 8vw, 8rem) 0 var(--space-7); background: linear-gradient(135deg, var(--color-surface) 62%, var(--color-paper) 62%); }
.hero-copy { max-width: 1120px; }
.hero-support { max-width: 760px; font-size: var(--text-lg); }
.button-row { display: flex; flex-wrap: wrap; gap: .8rem; margin: var(--space-5) 0; }
.scope-marker { display: flex; align-items: center; gap: .55rem; font-size: .82rem; font-weight: 650; }
.scope-marker span { color: var(--color-brass); }

/* 07 Energy Stack */
.energy-stack { margin-top: clamp(4rem, 8vw, 7rem); }
.stack-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 1.5rem; }
.stack-item { min-width: 0; min-height: 220px; padding: 1.5rem; border-right: var(--border); border-top: 5px solid var(--color-graphite); background: rgba(255,255,255,.7); }
.stack-item:nth-child(2) { border-top-color: var(--color-oxide); background: var(--color-paper); }
.stack-item:nth-child(3) { border-top-color: var(--color-mineral); }
.stack-item:nth-child(4) { border-right: 0; border-top-color: var(--color-cobalt); background: var(--color-fog); }
.stack-item .index { display: block; color: var(--color-muted); font-size: .75rem; }
.stack-item h3 { margin: 2.5rem 0 .5rem; text-transform: uppercase; }
.stack-item small { display: inline-block; margin-top: .7rem; border-top: 1px solid; color: var(--color-muted); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; }
.stud { display: block; width: 8px; height: 8px; margin: .7rem 0 0 auto; background: var(--color-graphite); }
.stud.brass { background: var(--color-brass); }.stud.oxide { background: var(--color-oxide); }.stud.mineral { background: var(--color-mineral); }.stud.cobalt { background: var(--color-cobalt); }

/* 08 System Balance */
.balance { color: var(--color-white); background: var(--color-graphite); }
.balance .section-kicker { border-color: #545b62; }.balance .section-kicker span { color: var(--color-sand); }.balance h2 { color: var(--color-white); }
.balance-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.balance-grid article { min-width: 0; padding: 2rem 1.5rem 0; border-left: 1px solid #555b61; }
.balance-grid span { color: var(--color-brass); font-size: .75rem; font-weight: 700; text-transform: uppercase; }
.balance-grid p { color: #d8dcda; }

/* 09 Energy Domains */
.domains-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); grid-auto-rows: auto; gap: clamp(1rem, 2vw, 2rem); align-items: start; }
.domain { height: auto; min-width: 0; padding: clamp(1.5rem, 3vw, 3rem); border: var(--border); border-top: 6px solid var(--color-cobalt); background: var(--color-white); }
.domain-one { grid-column: 1 / 8; }.domain-two { grid-column: 8 / 13; border-top-color: var(--color-oxide); background: var(--color-paper); }
.domain-three { grid-column: 1 / 6; border-top-color: var(--color-mineral); background: var(--color-fog); }.domain-four { grid-column: 6 / 13; border-top-color: var(--color-brass); }
.domain h3 { max-width: 590px; text-transform: uppercase; }
.boundary-note { padding-top: 1rem; border-top: var(--border); font-family: var(--font-serif); color: var(--color-ink); }
.tag-list { display: flex; flex-wrap: wrap; gap: .45rem; padding: 0; list-style: none; }
.tag-list li { padding: .25rem .5rem; border: var(--border); color: var(--color-muted); font-size: .72rem; }

/* 10 Energy Connections */
.connections { background: var(--color-paper); }
.connection-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 4px solid var(--color-graphite); }
.connection-grid article { min-width: 0; padding: 2rem 1.5rem; border-right: var(--border); }.connection-grid article:last-child { border: 0; }
.connection-grid b { font-size: .83rem; text-transform: uppercase; }
blockquote { max-width: 980px; margin: 3rem 0 0 auto; padding: 1.5rem 0 1.5rem 2rem; border-left: 3px solid var(--color-oxide); font-family: var(--font-serif); font-size: clamp(1.15rem, 2.1vw, 1.65rem); }

/* 11 Systems Continuity Test */
.test-section { background: var(--color-fog); }
.test-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-auto-rows: auto; gap: 1rem; }
.test-sheet { height: auto; min-width: 0; padding: 2rem; border-top: 4px solid var(--color-mineral); background: var(--color-surface); }
.test-sheet span { color: var(--color-brass); font-weight: 800; }.test-sheet h3 { margin-top: 2rem; }

/* 12 Reference Profiles */
.profiles-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-auto-rows: auto; gap: 1.2rem; }
.profile { height: auto; min-width: 0; padding: clamp(1.4rem, 2.4vw, 2.3rem); border: var(--border); background: var(--color-white); }
.profile.contact { border-top: 5px solid var(--color-brass); }.profile.contact:nth-child(2) { background: var(--color-paper); border-top-color: var(--color-oxide); }
.profile.research { border-top: 5px solid var(--color-cobalt); background: #f0f3f2; }.profile.research:nth-child(5) { background: var(--color-white); border-top-color: var(--color-mineral); }
.profile-top { display: flex; align-items: start; justify-content: space-between; }
.avatar { display: grid; width: 52px; height: 52px; place-items: center; background: var(--color-graphite); color: var(--color-white); font-weight: 750; }
.research .avatar { background: var(--color-cobalt); }.profile-index { color: var(--color-muted); font-size: .75rem; }
.profile-type { margin: 1.5rem 0 .5rem; }.profile h3 { margin-bottom: .7rem; }.role { color: var(--color-ink); }
.profile-context { padding-top: 1rem; border-top: var(--border); font-family: var(--font-serif); font-size: .91rem; }
.email-row { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; margin-top: 1.5rem; }
.email-row a { overflow-wrap: anywhere; color: var(--color-cobalt); font-size: .85rem; font-weight: 700; }
.copy-email, .text-button { min-height: 42px; padding: .55rem .8rem; border: 1px solid var(--color-graphite); background: transparent; cursor: pointer; font-size: .78rem; font-weight: 700; }
.copy-email:hover, .text-button:hover { background: var(--color-graphite); color: var(--color-white); }
.contact-clarification { margin-top: 2rem; padding: 2rem; border-left: 5px solid var(--color-oxide); background: var(--color-paper); }.contact-clarification h3 { font-size: 1rem; text-transform: uppercase; }

/* 13 Independence */
.independence { color: var(--color-white); background: var(--color-cobalt); }.independence h2, .independence p { color: var(--color-white); }.independence .eyebrow { color: var(--color-sand); }
.scope-content { padding-left: 2rem; border-left: 1px solid rgba(255,255,255,.4); }

/* 14 System Notes */
.notes-section { background: var(--color-paper); }.notes-list { border-top: 1px solid var(--color-ink); }
.system-note { height: auto; border-bottom: var(--border); }.system-note details { height: auto; }
.system-note summary { padding: 1.4rem .2rem; cursor: pointer; list-style: none; }.system-note summary::-webkit-details-marker { display: none; }
.system-note summary > span { display: grid; grid-template-columns: 180px minmax(0, 1fr) 230px auto; align-items: center; gap: 1rem; }
.system-note summary small { color: var(--color-cobalt); font-size: .72rem; font-weight: 750; text-transform: uppercase; }
.system-note summary b { font-size: clamp(1rem, 1.5vw, 1.3rem); }.system-note summary em { color: var(--color-muted); font-size: .78rem; font-style: normal; text-align: right; }
.system-note summary > span::after { content: "+"; grid-column: 4; color: var(--color-oxide); font-size: 1.5rem; }
.system-note details[open] summary > span::after { content: "−"; }
.note-body { max-width: 800px; padding: 0 1rem 1.5rem 196px; }.no-results { padding: 2rem; border: 1px solid var(--color-oxide); color: var(--color-ink); }

/* 15 Search */
.search-panel { margin-bottom: 2.5rem; padding: 1.5rem; border-left: 4px solid var(--color-brass); background: var(--color-surface); }
.search-panel label { display: block; margin-bottom: .7rem; font-weight: 750; }.search-row { display: flex; gap: .7rem; }
.search-row input { width: min(100%, 720px); min-height: 50px; padding: .7rem 1rem; border: var(--border); background: var(--color-white); color: var(--color-ink); }
.search-panel > p { margin: .6rem 0 0; font-size: .8rem; }
.clipboard-field { position: fixed; left: -9999px; }

/* 16 About */
.about { background: var(--color-surface); }.about-copy { font-size: var(--text-lg); }.about-copy p:first-child { color: var(--color-ink); font-family: var(--font-serif); font-size: clamp(1.3rem, 2.2vw, 1.85rem); }

/* 17 Systems Principles */
.principles { border-top: var(--border); }.principles-list article { display: grid; grid-template-columns: 70px minmax(200px, .7fr) minmax(0, 1fr); gap: 2rem; padding: 1.5rem 0; border-bottom: var(--border); }
.principles-list span { color: var(--color-oxide); font-weight: 800; }.principles-list h3, .principles-list p { margin: 0; }

/* 18 Final CTA */
.final-cta { padding-block: var(--space-7); background: var(--color-graphite); }.cta-field { padding: clamp(2rem, 5vw, 5rem); border-left: 5px solid var(--color-oxide); background: var(--color-paper); box-shadow: var(--shadow); }
.cta-field h2 { max-width: 900px; }.cta-field > div:first-child > p:last-child { max-width: 760px; }.button-dark { background: var(--color-graphite); color: var(--color-white); }.button-outline { border-color: var(--color-graphite); }

/* 19 Footer */
.site-footer { padding: 3.5rem 0 1.5rem; color: var(--color-white); background: var(--color-ink); }.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr auto; gap: 2rem; }
.footer-brand { display: flex; gap: 1rem; }.footer-brand img { filter: invert(1); }.footer-brand p, .footer-brand small { margin: .3rem 0; color: #bfc5c3; }.site-footer nav { display: grid; grid-template-columns: repeat(2, auto); gap: .4rem 1.5rem; }.site-footer a { font-size: .83rem; text-decoration: none; }
.back-top { align-self: start; color: var(--color-sand); }.footer-bottom { display: flex; justify-content: space-between; margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid #3b4045; }.footer-bottom p { margin: 0; color: #999f9e; font-size: .75rem; }

/* 20 Reveal */
.js-enabled .reveal { opacity: 0; transform: translateY(18px); transition: opacity 600ms ease, transform 600ms ease; }.js-enabled .reveal.is-visible { opacity: 1; transform: none; }

/* 21 Responsive */
@media (max-width: 1279px) {
  .brand { flex-basis: 240px; }.primary-nav { gap: .65rem; }.primary-nav a { font-size: .71rem; }.nav-action { display: none; }
  .profiles-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 1023px) {
  .menu-toggle { display: block; }.primary-nav { position: absolute; top: 78px; right: 1.5rem; left: 1.5rem; display: none; padding: 1rem; border: var(--border); background: var(--color-surface); box-shadow: var(--shadow); }.primary-nav.is-open { display: grid; }.primary-nav a { padding: .65rem; font-size: .9rem; }
  .nav-action { display: block; }.stack-grid, .balance-grid, .connection-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }.stack-item:nth-child(2), .connection-grid article:nth-child(2) { border-right: 0; }
  .balance-grid article { border-bottom: 1px solid #555b61; }.domains-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }.domain-one, .domain-two, .domain-three, .domain-four { grid-column: auto; }
  .test-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }.system-note summary > span { grid-template-columns: 150px minmax(0, 1fr); }.system-note summary em { grid-column: 2; text-align: left; }.system-note summary > span::after { grid-column: 3; grid-row: 1 / 3; }.note-body { padding-left: 166px; }
}
@media (max-width: 767px) {
  .container { width: min(calc(100% - 2rem), var(--container)); }.header-inner { min-height: 68px; }.brand { flex-basis: 215px; }.primary-nav { top: 68px; right: 1rem; left: 1rem; }
  .hero { padding-top: 3.5rem; background: var(--color-surface); }.button-row { align-items: stretch; flex-direction: column; }.button { width: 100%; }.scope-marker { align-items: flex-start; flex-wrap: wrap; }
  .section-kicker { align-items: flex-start; flex-direction: column; }.section-kicker span { margin-bottom: 0; }.stack-grid, .balance-grid, .connection-grid, .domains-grid, .test-grid, .profiles-grid, .split-layout { grid-template-columns: 1fr; }
  .stack-item, .connection-grid article { border-right: 0; border-bottom: var(--border); }.balance-grid article { border-left: 0; }.scope-content { padding: 1.5rem 0 0; border-top: 1px solid rgba(255,255,255,.4); border-left: 0; }
  .system-note summary > span { grid-template-columns: minmax(0, 1fr) auto; }.system-note summary small, .system-note summary b, .system-note summary em { grid-column: 1; }.system-note summary > span::after { grid-column: 2; grid-row: 1 / 4; }.note-body { padding: 0 0 1.5rem; }
  .search-row { align-items: stretch; flex-direction: column; }.principles-list article { grid-template-columns: 45px minmax(0, 1fr); gap: 1rem; }.principles-list p { grid-column: 2; }.footer-grid { grid-template-columns: 1fr; }.site-footer nav { grid-template-columns: 1fr 1fr; }.footer-bottom { align-items: flex-start; flex-direction: column; gap: .4rem; }
}
@media (max-width: 374px) { .brand { flex-basis: 190px; }.profile, .domain, .test-sheet { padding: 1.25rem; }.email-row { align-items: stretch; flex-direction: column; }.copy-email { width: 100%; } }

/* 22 Reduced Motion */
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }.js-enabled .reveal { opacity: 1; transform: none; } }