/* ==========================================================================
   Synoptic — stylesheet
   Zero dependencies, zero external requests, system fonts only.
   ========================================================================== */

:root {
  /* Surfaces — near-black with a slight cool cast */
  --bg:        #0b0c0e;
  --bg-1:      #101216;
  --bg-2:      #15181d;

  /* Hairlines */
  --line:      #1f242b;
  --line-soft: rgba(255, 255, 255, 0.055);
  --grid:      rgba(255, 255, 255, 0.016);

  /* Text */
  --fg:        #e7e9ec;
  --fg-dim:    #949ca6;
  --fg-faint:  #5a626c;

  /* Semantic accents — used sparingly and always to mean something */
  --accent:      #5b9df9;   /* structure, emphasis, active state */
  --accent-dim:  #2f6fd0;   /* selection */
  --amber:       #d9a93c;   /* caveat, judgement, the contested side */
  --amber-wash:  rgba(217, 169, 60, 0.07);
  --green:       #57a87a;   /* terminus — where a trail resolves */

  /* Type */
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono",
          "Roboto Mono", Menlo, Consolas, monospace;

  /* Rhythm */
  --shell:   1180px;
  --prose-w: 68ch;
  --gap:     clamp(56px, 9vw, 132px);
  --pad-x:   clamp(18px, 5vw, 48px);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: clamp(15px, 0.55vw + 13.4px, 16.5px);
  line-height: 1.65;
  font-feature-settings: "kern" 1;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Faint grid, fixed behind everything. Pure CSS, no canvas. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
}

::selection { background: var(--accent-dim); color: #fff; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible,
summary:focus-visible,
button:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

/* ==========================================================================
   Primitives
   ========================================================================== */

.shell {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.prose { max-width: var(--prose-w); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.19em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.eyebrow .idx { color: var(--fg-faint); }

h1, h2, h3 {
  font-weight: 550;
  letter-spacing: -0.018em;
  line-height: 1.14;
  margin: 0 0 18px;
  text-wrap: balance;
}
h2 { font-size: clamp(1.6rem, 3.3vw, 2.5rem); }
h3 {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  line-height: 1.4;
  margin: 0 0 8px;
}

p { margin: 0 0 1.05em; color: var(--fg-dim); }
p.lead {
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  color: var(--fg);
  line-height: 1.55;
}
p strong, li strong { color: var(--fg); font-weight: 600; }
em { color: var(--fg); font-style: italic; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 0.1em 0.38em;
  color: var(--fg);
}

.note {
  border-left: 2px solid var(--line);
  padding: 2px 0 2px 20px;
  margin: 26px 0;
  color: var(--fg-dim);
  font-size: 0.93rem;
}
.note.flag { border-left-color: var(--amber); }

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

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 12, 14, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-in {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: 56px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg);
  white-space: nowrap;
}
.brand b { color: var(--accent); font-weight: 600; }

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
  list-style: none;
  padding: 0;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--fg-faint);
  padding: 6px 9px;
  display: block;
}
.nav-links a:hover { color: var(--fg); text-decoration: none; }
.nav-links a[aria-current="true"] { color: var(--accent); }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--line);
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 7px 11px;
  cursor: pointer;
}

/* ==========================================================================
   Sections
   ========================================================================== */

.section { padding: var(--gap) 0; border-top: 1px solid var(--line); }
.section:first-of-type { border-top: 0; }

/* Hero */
.hero { padding: clamp(48px, 8vw, 96px) 0 var(--gap); }
/* Same measure as every other section's prose */
.hero-copy { max-width: var(--prose-w); }
.hero h1 {
  font-size: clamp(2.05rem, 6.4vw, 4rem);
  letter-spacing: -0.032em;
  font-weight: 560;
  margin-bottom: 22px;
}
.hero h1 .dim { color: var(--fg-faint); }
.hero-sub {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.17em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 26px;
}

/* Mission — the thesis line carries more weight than a normal h2 */
.mission-title {
  font-size: clamp(1.75rem, 4vw, 2.9rem);
  letter-spacing: -0.028em;
  color: var(--fg);
  margin-bottom: 30px;
  max-width: 20ch;
}

/* Coda — the short form, as a closing statement */
.coda { padding: var(--gap) 0 calc(var(--gap) * 0.7); }
.abstract {
  margin: 0;
  max-width: 74ch;
  border-left: 2px solid var(--accent);
  padding: 6px 0 6px clamp(20px, 3vw, 34px);
}
.abstract p {
  font-size: clamp(0.98rem, 1.35vw, 1.12rem);
  line-height: 1.62;
  color: var(--fg-dim);
  margin-bottom: 1em;
}
.abstract p:first-child { color: var(--fg); }
.abstract p:last-child {
  margin-bottom: 0;
  color: var(--fg);
  font-style: italic;
}

/* ==========================================================================
   Panels
   ========================================================================== */

.panel { border: 1px solid var(--line); background: var(--bg-1); }
.panel-hd {
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.19em;
  text-transform: uppercase;
  color: var(--fg-faint);
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
  display: flex;
  justify-content: space-between;
  gap: 10px;
}
.kvs { margin: 0; }
.kv {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 0.72rem;
}
.kv:last-child { border-bottom: 0; }
.kv dt {
  color: var(--fg-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}
.kv dd { margin: 0; color: var(--fg-dim); text-align: right; }
.kv dd.on { color: var(--accent); }

/* ==========================================================================
   Two-regime split (the Record / the Model)
   ========================================================================== */

.regimes {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  margin: 36px 0 8px;
  border: 1px solid var(--line);
}
.regime { padding: clamp(20px, 3vw, 30px); background: var(--bg-1); }
.regime + .divider + .regime { background: var(--bg-2); }
.regime-tag {
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.regime:first-child .regime-tag { color: var(--fg-faint); }
.regime:last-child .regime-tag { color: var(--accent); }
.regime h3 { font-size: 1.05rem; margin-bottom: 12px; }
.regime p { font-size: 0.88rem; margin-bottom: 0.8em; }
.regime ul {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.regime li {
  padding: 7px 0;
  border-top: 1px solid var(--line-soft);
  color: var(--fg-dim);
}
.divider {
  width: 1px;
  background: var(--line);
  position: relative;
}
.divider span {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(90deg);
  transform-origin: center;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
  background: var(--bg);
  padding: 5px 10px;
  border: 1px solid var(--line);
}

/* ==========================================================================
   Discourse / world comparison
   ========================================================================== */

.compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 32px 0;
}
.compare > div { background: var(--bg-1); padding: clamp(18px, 2.6vw, 26px); }
.compare .lbl {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 12px;
}
.compare q {
  display: block;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--fg);
  quotes: "\201C" "\201D";
  margin-bottom: 14px;
}
.compare .verdict {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--fg-dim);
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
}
.compare .sig .lbl { color: var(--accent); }
.compare .con .lbl { color: var(--amber); }

/* ==========================================================================
   Provenance chain
   ========================================================================== */

.chain { margin: 34px 0; border: 1px solid var(--line); }
.step {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg-1);
}
.step:last-child { border-bottom: 0; background: var(--bg-2); }
.step .lv {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.step:last-child .lv { color: var(--green); }
.step .dsc { font-size: 0.85rem; color: var(--fg-dim); }
.step .dsc code { font-size: 0.8em; }

/* ==========================================================================
   Card grid
   ========================================================================== */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 34px 0;
}
.card { background: var(--bg-1); padding: clamp(18px, 2.4vw, 26px); }
.card .n {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--fg-faint);
  display: block;
  margin-bottom: 12px;
}
.card p { font-size: 0.85rem; margin-bottom: 0; }
.card.warn { background: var(--amber-wash); }
.card.warn .n { color: var(--amber); }

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

.footer {
  border-top: 1px solid var(--line);
  padding: 42px 0 52px;
}
.footer-in {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--fg-faint);
}
.footer-in p { margin: 0; color: var(--fg-faint); }

/* Way back out: to the portfolio, and to the source */
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--fg-dim); }
.footer-links a:hover { color: var(--accent); }

/* Reveal on scroll — opt-in, degrades to visible without JS */
.reveal { opacity: 1; }
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.js .reveal.in { opacity: 1; transform: none; }

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

@media (max-width: 900px) {
  /* Regimes stack; the vertical divider becomes a horizontal band */
  .regimes { grid-template-columns: 1fr; }
  .divider { width: auto; height: 1px; }
  .divider span {
    transform: translate(-50%, -50%);
    font-size: 0.55rem;
  }

  .step { grid-template-columns: 1fr; gap: 5px; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    margin: 0;
    background: var(--bg-1);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.26s ease;
  }
  .nav-links.open { max-height: 72vh; overflow-y: auto; }
  .nav-links a {
    padding: 13px var(--pad-x);
    border-top: 1px solid var(--line-soft);
    font-size: 0.72rem;
  }
}

@media (max-width: 560px) {
  .cards, .compare { grid-template-columns: 1fr; }
  .footer-in { flex-direction: column; }
}

@media print {
  body::before, .nav { display: none; }
  body { background: #fff; color: #000; }
  .reveal { opacity: 1 !important; transform: none !important; }
}