/* ==========================================================================
   Proto Whitepaper v0.1 — stylesheet
   Family: humanphenome dispatch. Denser, more academic.
   ========================================================================== */

:root {
  --paper: #F5F3EC;
  --paper-2: #ECE9DE;
  --ink: #131311;
  --ink-2: #2A2A26;
  --ink-3: #5C5A54;
  --ink-4: #8E8B82;
  --rule: #D9D5C7;
  --rule-2: #C4BFAE;
  --teal: #01696F;
  --teal-2: #4F98A3;
  --code-bg: #12100D;
  --code-fg: #E9E4D3;
  --shadow: 0 10px 40px rgba(19, 19, 17, 0.06);
  --f-serif: "Instrument Serif", "Cormorant Garamond", "Times New Roman", serif;
  --f-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --f-mono: "DM Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --w-body: 720px;
  --w-wide: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; overflow-x: clip; }
body {
  font-family: var(--f-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
  font-weight: 400;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ==================== Progress bar ==================== */

.progress-bar {
  position: fixed; top: 0; left: 0;
  width: 0; height: 2px;
  background: var(--teal);
  z-index: 1000;
  transition: width 60ms linear;
}

/* ==================== Nav ==================== */

.nav {
  position: sticky; top: 0;
  z-index: 100;
  background: rgba(245, 243, 236, 0.86);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--rule);
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px;
  max-width: 100vw;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--ink);
}
.nav-brand-text {
  font-family: var(--f-serif);
  font-size: 20px;
  letter-spacing: -0.01em;
  font-style: italic;
}
.nav-sub {
  font-family: var(--f-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-left: 4px;
}
.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  font-family: var(--f-mono);
  text-decoration: none;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  transition: color 180ms;
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: var(--teal); }
.nav-toggle {
  display: none;
  background: none; border: none;
  cursor: pointer; padding: 8px;
  flex-direction: column; gap: 5px;
}
.nav-toggle span { display: block; width: 22px; height: 1.5px; background: var(--ink); border-radius: 2px; }

/* ==================== Hero ==================== */

.hero {
  position: relative;
  padding: 96px 32px 80px;
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 60% at 30% 40%, black 40%, transparent 90%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 30% 40%, black 40%, transparent 90%);
  pointer-events: none;
}
.hero-grain {
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.05;
  pointer-events: none;
  mix-blend-mode: multiply;
}
.hero-inner {
  position: relative;
  max-width: var(--w-wide);
  margin: 0 auto;
}
.hero-kicker {
  font-family: var(--f-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--teal);
  margin-bottom: 24px;
}
.hero-title {
  font-family: var(--f-serif);
  font-weight: 400;
  font-size: clamp(48px, 8vw, 108px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  max-width: 950px;
}
.hero-title em { font-style: italic; color: var(--ink-2); }
.hero-title span { display: block; }
.hero-sub {
  font-family: var(--f-serif);
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.35;
  color: var(--ink-2);
  font-style: italic;
  max-width: 720px;
  margin-bottom: 40px;
  font-weight: 400;
}
.hero-meta {
  display: flex;
  gap: 12px; align-items: center;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.hero-meta .dot { color: var(--rule-2); }
.hero-refs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  max-width: 720px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
}
.hero-ref { display: flex; flex-direction: column; gap: 6px; }
.ref-label {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.ref-link {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-2);
  padding-bottom: 3px;
  transition: color 180ms, border-color 180ms;
  word-break: break-all;
}
.ref-link:hover { color: var(--teal); border-color: var(--teal); }

/* ==================== Section skeleton ==================== */

.section {
  padding: 88px 32px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.section-alt { background: var(--paper-2); }
.wrap {
  max-width: var(--w-wide);
  margin: 0 auto;
}
.section-eyebrow {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 20px;
}
.section-title {
  font-family: var(--f-serif);
  font-weight: 400;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin-bottom: 40px;
  max-width: 900px;
  color: var(--ink);
}
.section-title em { font-style: italic; color: var(--ink-2); }
.sub-title {
  font-family: var(--f-sans);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
  text-transform: none;
  margin-bottom: 10px;
  color: var(--ink);
}

/* ==================== Prose ==================== */

.prose { max-width: var(--w-body); font-size: 17px; }
.prose > * + * { margin-top: 20px; }
.prose p { color: var(--ink-2); }
.prose .lede {
  font-family: var(--f-serif);
  font-size: 22px;
  line-height: 1.45;
  color: var(--ink);
  font-style: italic;
  margin-bottom: 28px;
}
.prose strong { color: var(--ink); font-weight: 600; }
.prose code {
  font-family: var(--f-mono);
  font-size: 0.88em;
  background: rgba(19, 19, 17, 0.06);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--ink);
}
.prose sup a {
  color: var(--teal);
  text-decoration: none;
  font-size: 0.7em;
  padding: 0 2px;
}
.prose sup a:hover { text-decoration: underline; }

/* ==================== Abstract ==================== */

.section-abstract {
  background: var(--paper-2);
  padding: 72px 32px;
}
.abstract-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--teal);
  box-shadow: var(--shadow);
}
.abstract-body {
  font-family: var(--f-serif);
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-2);
  font-style: italic;
  margin-top: 16px;
  margin-bottom: 24px;
}
.abstract-keywords {
  list-style: none;
  display: flex; flex-wrap: wrap;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}
.abstract-keywords li {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 12px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-3);
  background: var(--paper-2);
}

/* ==================== Spec lists ==================== */

.spec-list {
  list-style: none;
  padding: 0;
  margin-top: 20px;
}
.spec-list li {
  position: relative;
  padding: 14px 0 14px 30px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.55;
}
.spec-list li:last-child { border-bottom: none; }
.spec-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--teal);
  font-family: var(--f-mono);
}
.spec-list-heavy li {
  padding: 18px 0 18px 30px;
  font-size: 16px;
}

/* ==================== Callouts ==================== */

.callout {
  margin: 24px 0;
  padding: 20px 24px;
  background: var(--paper-2);
  border-left: 3px solid var(--teal);
  border-radius: 2px;
}
.callout-math .math-line {
  font-family: var(--f-mono);
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 10px;
}
.callout-math .math-line sub {
  font-size: 0.72em;
  color: var(--ink-3);
  vertical-align: sub;
}
.callout-math .math-line em {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 18px;
}
.callout-math .math-note {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 15px;
  color: var(--ink-3);
  margin: 0;
}

.pull-quote {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 22px;
  line-height: 1.45;
  color: var(--ink);
  padding: 24px 32px;
  border-left: 3px solid var(--teal);
  background: var(--paper);
  margin: 28px 0;
}

/* ==================== Two-col ==================== */

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 20px;
}
.two-col .col {
  padding: 20px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
}
.section-alt .two-col .col { background: var(--paper); }

/* ==================== Code blocks ==================== */

.code-block { margin: 24px 0; }
.code-caption {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 8px;
}
.code-block pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 24px;
  border-radius: 4px;
  overflow-x: auto;
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.6;
  border-left: 3px solid var(--teal);
}
.code-block code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ==================== Anchor table ==================== */

.anchor-table {
  margin-top: 28px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
  background: var(--paper);
}
.section-alt .anchor-table { background: var(--paper); }
.anchor-row {
  display: grid;
  grid-template-columns: 1.2fr 2fr 2fr;
  border-bottom: 1px solid var(--rule);
}
.anchor-row:last-child { border-bottom: none; }
.anchor-head {
  background: var(--paper-2);
}
.section-alt .anchor-head { background: var(--paper-2); }
.anchor-cell {
  padding: 14px 18px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-2);
  border-right: 1px solid var(--rule);
}
.anchor-cell:last-child { border-right: none; }
.anchor-head .anchor-cell {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}

/* ==================== Diagram ==================== */

.diagram {
  margin: 40px 0 20px;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
}
.section-alt .diagram { background: var(--paper); }
.arch-svg {
  width: 100%;
  max-width: 900px;
  height: auto;
  color: var(--ink-3);
  display: block;
  margin: 0 auto;
}
.arch-source {
  fill: var(--paper-2);
  stroke: var(--rule-2);
  stroke-width: 1;
}
.arch-core {
  fill: var(--ink);
  stroke: var(--teal);
  stroke-width: 1.5;
}
.arch-out {
  fill: var(--paper-2);
  stroke: var(--teal);
  stroke-width: 1;
}
.arch-label {
  font-family: var(--f-sans);
  font-size: 13px;
  font-weight: 600;
  fill: var(--ink);
}
.arch-label-inv { fill: var(--paper); }
.arch-title {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 20px;
  fill: var(--paper);
}
.arch-sub {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  fill: var(--ink-3);
}
.arch-sub-inv { fill: var(--paper-2); }
.diagram-caption {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-3);
  text-align: center;
  margin-top: 16px;
  padding: 0 20px;
}

/* ==================== Actors grid ==================== */

.actors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.actor-card {
  padding: 28px 24px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
  position: relative;
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms;
}
.section-alt .actor-card { background: var(--paper); }
.actor-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--rule-2);
}
.actor-num {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--teal);
  margin-bottom: 12px;
}
.actor-title {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 26px;
  color: var(--ink);
  margin-bottom: 12px;
  line-height: 1.15;
  font-weight: 400;
}
.actor-body {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-3);
}

/* ==================== Roadmap ==================== */

.roadmap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 32px;
  border-top: 1px solid var(--rule);
}
.road-phase {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}
.road-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  padding-top: 6px;
}
.road-title {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 24px;
  color: var(--ink);
  margin-bottom: 10px;
  line-height: 1.2;
  font-weight: 400;
}
.road-body {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink-3);
  max-width: 640px;
}

/* ==================== Closing ==================== */

.section-close {
  background: var(--ink);
  color: var(--paper);
  border-bottom: none;
  padding: 96px 32px;
}
.close-inner { max-width: var(--w-body); margin: 0 auto; text-align: left; }
.section-close .section-eyebrow { color: var(--teal-2); }
.close-title {
  font-family: var(--f-serif);
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.05;
  color: var(--paper);
  margin-bottom: 28px;
  font-weight: 400;
  font-style: normal;
}
.close-title em { font-style: italic; color: var(--paper-2); }
.close-body {
  font-family: var(--f-serif);
  font-size: 20px;
  line-height: 1.5;
  color: var(--paper-2);
  margin-bottom: 36px;
  font-style: italic;
}
.close-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ==================== Buttons ==================== */

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 999px;
  transition: all 200ms;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--teal);
  color: var(--paper);
}
.btn-primary:hover { background: #024c50; }
.btn-ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--paper-2);
}
.btn-ghost:hover { background: rgba(245, 243, 236, 0.1); }

/* ==================== References ==================== */

.section-refs {
  background: var(--paper-2);
}
.refs-list {
  list-style: decimal;
  padding-left: 24px;
  max-width: 820px;
  margin-top: 20px;
}
.refs-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-3);
}
.refs-list li:last-child { border-bottom: none; }
.refs-list li em {
  font-family: var(--f-serif);
  font-style: italic;
  color: var(--ink-2);
  font-size: 15.5px;
}
.refs-list li a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-2);
}
.refs-list li a:hover { border-color: var(--teal); }

/* ==================== Footer ==================== */

.footer {
  background: var(--ink);
  color: var(--paper-2);
  padding: 48px 32px;
}
.footer-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-brand {
  font-family: var(--f-serif);
  font-style: italic;
  font-size: 18px;
  color: var(--paper);
}
.footer-meta, .footer-contact {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.footer-contact a { color: var(--teal-2); text-decoration: none; }
.footer-contact a:hover { color: var(--paper); }

/* ==================== Responsive ==================== */

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    padding: 20px 32px;
    gap: 16px;
    align-items: flex-start;
  }
  .nav-toggle { display: flex; }
  .two-col { grid-template-columns: 1fr; }
  .road-phase {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .anchor-row { grid-template-columns: 1fr; }
  .anchor-cell { border-right: none; border-bottom: 1px solid var(--rule); }
  .anchor-row:last-child .anchor-cell:last-child { border-bottom: none; }
}

@media (max-width: 640px) {
  .hero, .section { padding-left: 20px; padding-right: 20px; }
  .footer { padding-left: 20px; padding-right: 20px; }
  .nav { padding: 12px 20px; }
  .abstract-inner { padding: 24px; }
  .actors-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 64px; padding-bottom: 56px; }
  .section { padding-top: 64px; padding-bottom: 64px; }
  .code-block pre { padding: 16px; font-size: 12px; }
  .pull-quote { padding: 20px; font-size: 18px; }
}