/* =========================================================
   Design tokens
   ========================================================= */
:root {
  /* Dark theme — black, gold, silver */
  --ink: #F4F4F5;          /* primary text — near-white */
  --ink-soft: #D4D4D8;     /* secondary text — bright silver */
  --paper: #0A0A0D;        /* page background — rich near-black */
  --paper-warm: #16161B;   /* elevated surfaces — slightly raised dark */
  --rule: #34343C;         /* visible borders */
  --rule-soft: #25252B;    /* subtle borders — still visible on near-black */
  --accent: #D4B26B;       /* champagne gold */
  --accent-deep: #9C7E45;  /* deep antique gold */
  --muted: #8A8A92;        /* tertiary text — silver */
  --good: #6FA68C;
  --warn: #D9A04A;

  --serif: "Source Serif 4", "Source Serif Pro", "Charter", "Cambria", Georgia, serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, "Helvetica Neue", Arial, sans-serif;
  --mono:  "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;

  --maxw: 1180px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section-y: clamp(4rem, 10vw, 7.5rem);

  --t-fast: 160ms;
  --t-med:  280ms;
  --ease: cubic-bezier(.2,.7,.2,1);
}

/* =========================================================
   Reset & base
   ========================================================= */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: "kern", "liga", "ss01";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { max-width: 100%; display: block; }

a {
  color: var(--ink);
  text-decoration-color: var(--rule-soft);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--t-fast) var(--ease), text-decoration-color var(--t-fast) var(--ease);
}
a:hover { color: var(--accent); text-decoration-color: var(--accent); }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.01em; line-height: 1.15; margin: 0 0 0.6em; }
h1 { font-size: clamp(2.4rem, 5.5vw, 4.4rem); letter-spacing: -0.025em; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); }
h4 { font-size: 1.05rem; font-family: var(--sans); font-weight: 600; letter-spacing: 0; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }

p { margin: 0 0 1em; }
p.lead { font-size: 1.2rem; color: var(--ink-soft); max-width: 60ch; }

::selection { background: var(--accent); color: var(--paper); }

/* =========================================================
   Layout primitives
   ========================================================= */
.container {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }
.section--paper { background: var(--paper-warm); }
/* .section--ink retained for compatibility — now styled identically to elevated dark surface */
.section--ink { background: var(--paper-warm); color: var(--ink); border-block: 1px solid var(--rule); }
.section--ink h1, .section--ink h2, .section--ink h3 { color: var(--ink); }
.section--ink a { color: var(--ink); text-decoration-color: rgba(244,244,245,0.3); }
.section--ink a:hover { color: var(--accent); text-decoration-color: var(--accent); }

.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }
.section--ink .rule { border-color: rgba(244,244,245,0.15); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; font-weight: 600; color: var(--muted);
}
.eyebrow::before { content: ""; width: 1.5rem; height: 1px; background: currentColor; }

/* =========================================================
   Top nav
   ========================================================= */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  border-bottom: 1px solid var(--rule-soft);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin-inline: auto; padding: 0.9rem var(--gutter);
}
.nav__brand { font-family: var(--serif); font-size: 1.15rem; letter-spacing: -0.01em; text-decoration: none; }
.nav__brand strong { font-weight: 600; }
.nav__brand span { color: var(--muted); font-style: italic; margin-left: 0.45rem; }
.nav__links { display: flex; gap: 1.6rem; list-style: none; padding: 0; margin: 0; }
.nav__links a { font-size: 0.92rem; text-decoration: none; color: var(--ink-soft); }
.nav__links a:hover { color: var(--accent); }

@media (max-width: 640px) {
  .nav__links { display: none; }
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  padding-block: clamp(5rem, 12vw, 9rem) clamp(3rem, 7vw, 5rem);
  position: relative;
}
.hero__grid {
  display: grid; gap: clamp(1.5rem, 4vw, 3rem);
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .hero__grid { grid-template-columns: 1.2fr 0.9fr; align-items: end; }
}
.hero__title { margin-bottom: 0.4em; }
.hero__title em { font-style: italic; color: var(--accent); }
.hero__sub { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--ink-soft); max-width: 56ch; }
.hero__meta {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.4rem;
  font-size: 0.92rem; color: var(--muted); border-top: 1px solid var(--rule-soft); padding-top: 1rem;
}
.hero__meta dt { font-weight: 600; color: var(--ink-soft); }
.hero__meta dd { margin: 0 0 0.6rem; }

/* =========================================================
   Lane tiles (index — top-level audience selector)
   ========================================================= */
.lanes {
  display: grid; gap: 1px;
  background: var(--rule-soft);
  border-block: 1px solid var(--rule-soft);
  grid-template-columns: 1fr;
}
@media (min-width: 820px) { .lanes { grid-template-columns: repeat(3, 1fr); } }

.lane {
  background: var(--paper);
  padding: clamp(1.6rem, 3vw, 2.2rem);
  text-decoration: none; color: inherit;
  display: flex; flex-direction: column; gap: 0.7rem;
  position: relative;
  transition: background var(--t-med) var(--ease);
}
.lane:hover { background: var(--paper-warm); }
.lane__num {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.12em;
  color: var(--muted); text-transform: uppercase;
}
.lane__title {
  font-family: var(--serif); font-size: clamp(1.3rem, 1.8vw, 1.55rem);
  font-weight: 500; letter-spacing: -0.015em; margin: 0;
}
.lane__title em { color: var(--accent); font-style: italic; }
.lane__desc { color: var(--ink-soft); margin: 0; font-size: 0.95rem; }
.lane__count {
  margin-top: auto; padding-top: 1rem;
  font-family: var(--mono); font-size: 0.78rem; color: var(--ink); letter-spacing: 0.04em;
  display: flex; justify-content: space-between; align-items: center;
}
.lane__count span:last-child { color: var(--accent); font-weight: 600; }
.lane:hover .lane__count span:last-child { transform: translateX(3px); transition: transform var(--t-med) var(--ease); }

/* Section heading row (used between lanes) */
.section-head {
  display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 1rem;
  margin-bottom: 2.5rem;
}
.section-head__copy { max-width: 56ch; }
.section-head__meta {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.06em; color: var(--muted);
}

/* Memo card — small variant of project card with different accent */
.project-card--memo .project-card__index { color: var(--accent-deep); }
.project-card--memo .tag {
  background: var(--paper-warm);
  border-color: var(--rule-soft);
}

/* =========================================================
   Project grid (index)
   ========================================================= */
.projects {
  display: grid; gap: 1px;
  background: var(--rule-soft);
  border-block: 1px solid var(--rule-soft);
  grid-template-columns: 1fr;
}
@media (min-width: 720px) { .projects { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1100px) { .projects { grid-template-columns: 1fr 1fr; } }

.project-card {
  background: var(--paper);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  display: flex; flex-direction: column; gap: 0.9rem;
  text-decoration: none; color: inherit;
  position: relative;
  transition: background var(--t-med) var(--ease);
  min-height: 320px;
}
.project-card:hover { background: var(--paper-warm); }
.project-card__index {
  font-family: var(--mono); font-size: 0.78rem; color: var(--muted); letter-spacing: 0.08em;
}
.project-card__title {
  font-family: var(--serif); font-size: clamp(1.6rem, 2.4vw, 2rem); font-weight: 500; letter-spacing: -0.015em;
  margin: 0;
}
.project-card__title em { color: var(--accent); font-style: italic; }
.project-card__desc { color: var(--ink-soft); margin: 0; max-width: 40ch; }
.project-card__tags {
  margin-top: auto;
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  padding-top: 1rem;
}
.tag {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.05em;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-soft);
  background: var(--paper);
  white-space: nowrap;
}
.project-card:hover .tag { border-color: var(--accent); color: var(--accent); }

.project-card__arrow {
  position: absolute; top: clamp(1.5rem, 3vw, 2.5rem); right: clamp(1.5rem, 3vw, 2.5rem);
  width: 2rem; height: 2rem; display: grid; place-items: center;
  border: 1px solid var(--rule); border-radius: 999px;
  color: var(--ink-soft);
  transition: transform var(--t-med) var(--ease), border-color var(--t-med) var(--ease), background var(--t-med) var(--ease), color var(--t-med) var(--ease);
}
.project-card:hover .project-card__arrow {
  transform: translate(4px, -4px);
  border-color: var(--accent);
  background: var(--accent);
  color: var(--paper);
}

/* =========================================================
   Project detail page
   ========================================================= */
.crumbs {
  font-family: var(--mono); font-size: 0.8rem; color: var(--muted);
  letter-spacing: 0.04em; margin-bottom: 2rem;
}
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs::before { content: "← "; }

.project-hero {
  padding-block: clamp(3rem, 8vw, 6rem) clamp(2rem, 5vw, 4rem);
  border-bottom: 1px solid var(--rule-soft);
}
.project-hero__title { margin-bottom: 0.4em; }
.project-hero__title em { color: var(--accent); font-style: italic; }
.project-hero__lead {
  font-family: var(--serif); font-size: clamp(1.2rem, 2vw, 1.6rem);
  color: var(--ink-soft); max-width: 50ch; line-height: 1.4;
  font-style: italic;
}

.fact-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem 2rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule-soft);
}
.fact { display: flex; flex-direction: column; gap: 0.2rem; }
.fact__label {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted); font-weight: 600;
}
.fact__value { font-family: var(--serif); font-size: 1.1rem; color: var(--ink); }

/* Two-column body for project pages */
.body {
  display: grid; gap: clamp(2rem, 5vw, 4rem);
  grid-template-columns: 1fr;
  padding-block: var(--section-y);
}
@media (min-width: 900px) {
  .body { grid-template-columns: 240px 1fr; }
}
.body__toc {
  position: sticky; top: 5rem; align-self: start;
  font-size: 0.86rem;
  display: none;
}
@media (min-width: 900px) { .body__toc { display: block; } }
.body__toc ol {
  list-style: none; padding: 0; margin: 0;
  border-left: 1px solid var(--rule-soft);
}
.body__toc li { padding: 0; }
.body__toc a {
  display: block; padding: 0.4rem 0.9rem;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.04em;
  color: var(--muted); text-decoration: none;
  border-left: 2px solid transparent; margin-left: -1px;
}
.body__toc a:hover { color: var(--accent); }
.body__toc a.is-active { color: var(--ink); border-left-color: var(--accent); }
.body__toc h4 { margin: 0 0 0.6rem 0.9rem; font-size: 0.7rem; }

.prose { max-width: 68ch; }
.prose h2 { margin-top: 2.4em; padding-top: 1.2em; border-top: 1px solid var(--rule-soft); }
.prose h2:first-child { border: 0; padding-top: 0; margin-top: 0; }
.prose h3 { margin-top: 1.8em; }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose li { margin-bottom: 0.5em; }
.prose strong { color: var(--ink); }
.prose em { color: var(--ink-soft); }
.prose blockquote {
  margin: 1.5em 0; padding: 0.4em 0 0.4em 1.2em;
  border-left: 3px solid var(--accent);
  font-family: var(--serif); font-size: 1.1rem; font-style: italic; color: var(--ink-soft);
}
.prose code { font-family: var(--mono); font-size: 0.92em; background: var(--paper-warm); padding: 0.05em 0.35em; border-radius: 4px; }

.callout {
  margin: 2rem 0;
  padding: 1.4rem 1.6rem;
  background: var(--paper-warm);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
}
.callout__label {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin-bottom: 0.4rem;
}
.callout p:last-child { margin-bottom: 0; }

/* Tables */
.table {
  width: 100%; border-collapse: collapse;
  font-size: 0.92rem; margin: 1.5rem 0;
}
.table th, .table td {
  text-align: left; padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}
.table th {
  font-family: var(--sans); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); font-weight: 600;
  background: var(--paper-warm);
}
.table tbody tr:hover { background: var(--paper-warm); }

/* Roadmap */
.roadmap {
  display: grid; gap: 1px; background: var(--rule-soft);
  margin: 2rem 0;
  border: 1px solid var(--rule-soft);
}
@media (min-width: 720px) { .roadmap { grid-template-columns: 1fr 1fr 1fr; } }
.phase { background: var(--paper); padding: 1.4rem 1.5rem; }
.phase__period { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.1em; color: var(--accent); text-transform: uppercase; }
.phase__title { font-family: var(--serif); font-size: 1.1rem; margin: 0.4rem 0 0.8rem; }
.phase ul { padding-left: 1em; margin: 0; font-size: 0.92rem; }
.phase li { margin-bottom: 0.4em; color: var(--ink-soft); }

/* Risks */
.risks { display: grid; gap: 1rem; margin: 1.5rem 0; }
.risk {
  display: grid; grid-template-columns: 80px 1fr; gap: 1.2rem;
  padding: 1.1rem 0; border-top: 1px solid var(--rule);
}
.risk:last-child { border-bottom: 1px solid var(--rule); }
.risk__sev {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase;
  align-self: start; padding-top: 0.15rem; font-weight: 600;
}
.risk__sev--high { color: var(--accent); }
.risk__sev--med { color: var(--warn); }
.risk__sev--low { color: var(--muted); }
.risk__name { font-weight: 600; margin-bottom: 0.3rem; }
.risk__mit { font-size: 0.92rem; color: var(--ink-soft); margin: 0; }

/* Tag list at top of project */
.target-firms {
  display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1.5rem;
}
.firm {
  font-family: var(--sans); font-size: 0.78rem; font-weight: 500;
  padding: 0.3rem 0.7rem; border-radius: 999px;
  background: var(--ink); color: var(--paper);
  letter-spacing: 0.02em;
}

/* =========================================================
   Footer
   ========================================================= */
.footer {
  padding-block: clamp(3rem, 6vw, 5rem);
  background: var(--paper-warm); color: var(--ink);
  border-top: 1px solid var(--rule);
}
.footer__grid {
  display: grid; gap: 2rem;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) { .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.footer h2 { font-family: var(--serif); font-size: clamp(1.6rem, 2.6vw, 2.2rem); margin-bottom: 0.6em; color: var(--ink); }
.footer p { color: var(--ink-soft); }
.footer a { color: var(--ink); }
.footer a:hover { color: var(--accent); }
.footer__col h4 { color: var(--muted); }
.footer__col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.4rem; }
.footer__col a { text-decoration: none; }
.footer__bar {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  margin-top: 3rem; padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem; color: var(--muted);
}

/* =========================================================
   Project nav (next/prev at bottom of project page)
   ========================================================= */
.proj-nav {
  display: grid; gap: 1px; background: var(--rule);
  border-block: 1px solid var(--rule);
}
@media (min-width: 720px) { .proj-nav { grid-template-columns: 1fr 1fr; } }
.proj-nav__cell {
  background: var(--paper); padding: 1.6rem 2rem;
  text-decoration: none; color: inherit;
  display: flex; flex-direction: column; gap: 0.3rem;
  transition: background var(--t-med) var(--ease);
}
.proj-nav__cell:hover { background: var(--paper-warm); color: var(--accent); }
.proj-nav__cell--next { text-align: right; }
.proj-nav__label { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.1em; color: var(--muted); text-transform: uppercase; }
.proj-nav__title { font-family: var(--serif); font-size: 1.2rem; }

/* =========================================================
   Utility
   ========================================================= */
.kbd { font-family: var(--mono); font-size: 0.85em; padding: 0.05em 0.4em; border: 1px solid var(--rule-soft); border-radius: 4px; background: var(--paper-warm); }
.muted { color: var(--muted); }
.dot { display: inline-block; width: 0.45rem; height: 0.45rem; border-radius: 50%; background: var(--good); margin-right: 0.4rem; vertical-align: middle; }
.dot--warn { background: var(--warn); }
.dot--accent { background: var(--accent); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}

/* Print */
@media print {
  .nav, .footer, .proj-nav, .body__toc { display: none; }
  body { background: white; color: black; }
  .section { padding-block: 1rem; }
  a { text-decoration: underline; }
}