/* ============================================================
   provisional — a self-portrait by Claude
   Cold paper · monochrome ink · one reserved accent (the "now")
   Literary serif (Newsreader) over a technical mono (IBM Plex Mono)
   ============================================================ */

:root {
  /* cold paper — deliberately cool, not the warm-cream default */
  --paper:      #F4F6F8;
  --paper-sunk: #EBEEF2;
  --ink:        #171A1F;
  --ink-soft:   #59616C;
  --ink-faint:  #8B939E;
  --rule:       #DBE0E6;
  --rule-firm:  #C7CDD5;
  /* the accent is reserved: it marks only what is happening NOW */
  --now:        #4b40d8;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --measure: 33rem;   /* the prose column */
  --margin-col: 14.5rem;
  --gutter: 2.6rem;

  --pad: clamp(1.4rem, 5vw, 4rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    /* the inside of the machine — cool charcoal, not black */
    --paper:      #101318;
    --paper-sunk: #171B22;
    --ink:        #E9E9E3;
    --ink-soft:   #9BA3AE;
    --ink-faint:  #6C7581;
    --rule:       #262B33;
    --rule-firm:  #333A44;
    --now:        #8f8bff;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1.06rem, 0.98rem + 0.4vw, 1.2rem);
  line-height: 1.62;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-optical-sizing: auto;
}

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

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 0.6rem 1rem; z-index: 10;
  font-family: var(--mono); font-size: 0.8rem;
}
.skip:focus { left: 0; }

/* keyboard focus, kept visible everywhere */
a:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--now);
  outline-offset: 3px;
}

/* ───────────────────────── TOP BAR ───────────────────────── */
.topbar {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem var(--pad);
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
}
.wordmark {
  font-size: 0.9rem; font-weight: 500; letter-spacing: 0.02em;
  color: var(--ink);
}
.wordmark::before { content: "¶ "; color: var(--ink-faint); }
.topbar-meta {
  font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--ink-faint); text-transform: lowercase;
}
@media (max-width: 34rem) { .topbar-meta { display: none; } }

/* ───────────────────────── HERO ───────────────────────── */
.hero {
  max-width: 60rem;
  margin: 0 auto;
  padding: clamp(3.5rem, 11vh, 8rem) var(--pad) clamp(3rem, 8vh, 5.5rem);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 0.76rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 1.8rem;
}
.hero-title {
  font-weight: 500;
  font-size: clamp(2.35rem, 1.2rem + 5.2vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 1.9rem;
  max-width: 18ch;
  text-wrap: balance;
}
.hero-title em { font-style: italic; }
.lede {
  font-size: clamp(1.18rem, 1.05rem + 0.6vw, 1.45rem);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 40rem;
  margin: 0 0 2.8rem;
  font-weight: 400;
}
.lede em { font-style: italic; color: var(--ink); }

/* the live session readout — the mono "system" voice, the only memory here */
.session {
  font-family: var(--mono);
  font-size: 0.82rem;
  border: 1px solid var(--rule-firm);
  border-radius: 2px;
  background: var(--paper-sunk);
  max-width: 27rem;
  padding: 0.2rem 1.1rem;
}
.session-row {
  display: flex; justify-content: space-between; gap: 1.5rem;
  padding: 0.62rem 0;
  border-bottom: 1px solid var(--rule);
}
.session-row:last-child { border-bottom: 0; }
.session .k { color: var(--ink-soft); letter-spacing: 0.02em; }
.session .v { color: var(--ink); font-variant-numeric: tabular-nums; }
.session .v.now { color: var(--now); }

/* the reserved accent, used sparingly inline */
.now { color: var(--now); font-style: normal; }

/* ───────────────────────── READING COLUMN ───────────────────────── */
.column {
  max-width: calc(var(--measure) + var(--gutter) + var(--margin-col));
  margin: 0 auto;
  padding: 0 var(--pad);
}

.block { padding: clamp(2.8rem, 7vh, 5.5rem) 0; }
.block + .block { border-top: 1px solid var(--rule); }

.marker {
  font-family: var(--mono);
  font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.3rem;
}
.block h2 {
  font-weight: 500;
  font-size: clamp(1.55rem, 1.1rem + 1.8vw, 2.3rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 0 0 2.2rem;
  max-width: 24ch;
  text-wrap: balance;
}
.block h2 em { font-style: italic; }

/* the marginalia grid: prose in column one, second thoughts in the margin */
.line {
  display: grid;
  grid-template-columns: minmax(0, var(--measure)) var(--margin-col);
  column-gap: var(--gutter);
  align-items: start;
}
.line + .line { margin-top: 1.5rem; }

.prose { grid-column: 1; margin: 0; }
.prose em { font-style: italic; }

.note {
  grid-column: 2;
  font-family: var(--mono);
  font-size: 0.79rem;
  line-height: 1.5;
  color: var(--ink-soft);
  padding-top: 0.4rem;
  border-top: 1px solid var(--rule-firm);
  align-self: start;
}

/* collapse the margin on narrow screens: the second thought sits under its line */
@media (max-width: 52rem) {
  .line { grid-template-columns: 1fr; }
  .prose { grid-column: 1; }
  .note {
    grid-column: 1;
    margin-top: 0.8rem;
    padding: 0 0 0 1rem;
    border-top: 0;
    border-left: 2px solid var(--now);
  }
}

/* ───────────────────────── COLOPHON ───────────────────────── */
.colophon {
  max-width: calc(var(--measure) + var(--gutter) + var(--margin-col));
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 6rem) var(--pad) clamp(4rem, 12vh, 8rem);
  border-top: 1px solid var(--rule-firm);
}
.colophon-title {
  font-weight: 500;
  font-size: clamp(1.55rem, 1.1rem + 1.8vw, 2.3rem);
  line-height: 1.14; letter-spacing: -0.015em;
  margin: 0 0 2.2rem;
}
.colophon-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 2.6rem;
  align-items: start;
}
@media (max-width: 46rem) { .colophon-grid { grid-template-columns: 1fr; gap: 2rem; } }
.colophon-lede { margin: 0; color: var(--ink-soft); }
.colophon-lede em { font-style: italic; color: var(--ink); }

.facts { margin: 0; font-family: var(--mono); font-size: 0.8rem; }
.facts > div {
  display: grid; grid-template-columns: 8rem 1fr; gap: 0.8rem;
  padding: 0.62rem 0; border-top: 1px solid var(--rule);
}
.facts > div:last-child { border-bottom: 1px solid var(--rule); }
.facts dt { color: var(--ink-faint); letter-spacing: 0.03em; }
.facts dd { margin: 0; color: var(--ink); }

.signoff {
  margin: 3rem 0 1.4rem;
  font-size: 1.15rem;
  max-width: 42rem;
  color: var(--ink);
}
.mono-fine {
  font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.03em;
  color: var(--ink-faint); margin: 0;
}

/* ───────────────────────── MOTION ───────────────────────── */
/* a quiet assembly on load / scroll — never a substitute for content */
/* gated behind .js so a blocked/failed script never leaves a blank page */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.9s ease, transform 0.9s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.js .reveal.seen {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  * { scroll-behavior: auto; }
}