/* PSP design system — shared by all Planisphere surfaces.
   Source of truth: PSP-001 brand guide.
   Do not edit color tokens here without updating PSP-001. */

:root {
  --ink: #0A0E14;
  --ink-2: #1A1F26;
  --paper: #F4F1EA;
  --paper-2: #E8E3D7;
  --paper-3: #DAD3C2;
  --rule: #2A2F36;
  --rule-soft: rgba(10, 14, 20, 0.12);

  --brass: #B8915A;
  --brass-deep: #8C6A3F;
  --brass-light: #D4B485;

  --signal: #C4452E;
  --plot: #2D5A4F;
  --void: #060810;

  --serif: 'Fraunces', 'Times New Roman', serif;
  --sans: 'Inter Tight', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 56px;
}

/* ============ MASTHEAD ============ */
.masthead {
  border-bottom: 1px solid var(--rule);
  padding: 24px 0 18px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  gap: 32px;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.masthead .left { text-align: left; }
.masthead .center {
  text-align: center;
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 400;
  letter-spacing: -0.01em;
  text-transform: none;
  font-style: italic;
}
.masthead .center em { font-style: italic; color: var(--brass-deep); }
.masthead .right { text-align: right; }
.masthead .sub { display: block; opacity: 0.55; margin-top: 4px; letter-spacing: 0.08em; }
.masthead a { color: inherit; text-decoration: none; border-bottom: 1px solid transparent; }
.masthead a:hover { border-bottom-color: var(--brass-deep); }

/* ============ NAV ============ */
.psp-nav {
  display: flex;
  gap: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.psp-nav a {
  color: var(--ink);
  text-decoration: none;
  opacity: 0.6;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.psp-nav a:hover, .psp-nav a.active { opacity: 1; border-bottom-color: var(--brass-deep); }

/* ============ HERO ============ */
.hero {
  padding: 80px 0 100px;
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 80px;
  align-items: center;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.hero-eyebrow::before {
  content: "";
  width: 32px;
  height: 1px;
  background: var(--ink);
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(56px, 8vw, 112px);
  line-height: 0.95;
  letter-spacing: -0.035em;
  margin-bottom: 36px;
}
.hero h1 em { font-style: italic; font-weight: 300; color: var(--brass-deep); }
.hero-lede {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.4;
  font-weight: 300;
  max-width: 560px;
  color: var(--ink-2);
  margin-bottom: 40px;
}
.hero-meta {
  display: flex;
  gap: 48px;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.hero-meta div span { display: block; opacity: 0.5; margin-bottom: 4px; }

.astrolabe { aspect-ratio: 1; position: relative; }
.astrolabe svg { width: 100%; height: 100%; }

/* ============ SECTION ============ */
section {
  padding: 100px 0;
  border-bottom: 1px solid var(--rule);
}
.section-head {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  margin-bottom: 64px;
  align-items: baseline;
}
.section-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.5;
}
.section-title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: 52px;
  line-height: 1;
  letter-spacing: -0.02em;
}
.section-title em { font-style: italic; color: var(--brass-deep); }
.section-kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-top: 16px;
  opacity: 0.6;
}

/* ============ BODY GRID ============ */
.body-grid { display: grid; grid-template-columns: 80px 1fr; gap: 24px; }
.body-grid .pad { /* empty spacer */ }
.body-content { max-width: 880px; }

.lede {
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1.3;
  font-weight: 300;
  letter-spacing: -0.012em;
  margin-bottom: 48px;
}
.lede em { font-style: italic; color: var(--brass-deep); }

.prose {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
  font-weight: 300;
  color: var(--ink-2);
}
.prose p { margin-bottom: 22px; }
.prose em { font-style: italic; color: var(--brass-deep); }
.prose h3 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 300;
  font-style: italic;
  color: var(--ink);
  margin: 48px 0 16px;
  letter-spacing: -0.01em;
}
.prose h3 em { color: var(--brass-deep); }
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 22px; }
.prose li { margin-bottom: 6px; }

/* ============ PILLARS ============ */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 56px;
  padding-top: 48px;
  border-top: 1px solid var(--rule-soft);
}
.pillar h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 16px;
  color: var(--brass-deep);
}
.pillar p {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.45;
  font-weight: 300;
}

/* ============ SPEC TABLE ============ */
.spec-table {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  border-top: 1px solid var(--rule);
  margin: 32px 0;
}
.spec-table .row {
  display: grid;
  grid-template-columns: 240px 1fr;
  padding: 14px 0;
  border-bottom: 1px dashed var(--rule-soft);
  align-items: baseline;
}
.spec-table .row .k {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  opacity: 0.55;
  font-size: 10px;
}
.spec-table .row .v {
  font-size: 13px;
  color: var(--ink);
}
.spec-table .row .v code {
  font-family: var(--mono);
  background: var(--paper-2);
  padding: 2px 6px;
  border-radius: 2px;
  font-size: 11px;
}

/* ============ DATA TABLE (markdown-derived) ============ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-family: var(--sans);
  font-size: 14px;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}
.data-table th {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.6;
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
}
.data-table tr:hover td { background: var(--paper-2); }
.data-table code {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--paper-2);
  padding: 2px 6px;
  border-radius: 2px;
}

/* ============ TERMINAL ============ */
.terminal-block {
  background: var(--void);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  padding: 28px 32px;
  border: 1px solid var(--rule);
  margin: 32px 0;
  overflow-x: auto;
}
.terminal-block .prompt { color: var(--brass-light); }
.terminal-block .out { opacity: 0.7; }
.terminal-block .ok { color: var(--brass-light); }
.terminal-block .sig { color: var(--signal); }
.terminal-block .plot { color: #5FA89C; }

/* ============ CALLOUT ============ */
.callout {
  border-left: 2px solid var(--brass);
  padding: 16px 0 16px 24px;
  margin: 32px 0;
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.45;
  font-weight: 300;
  font-style: italic;
}
.callout em { color: var(--brass-deep); }

/* ============ MARGINALIA / CHAPTER ============ */
.chapter {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass-deep);
  margin-bottom: 12px;
}

/* ============ COLOPHON ============ */
.colophon {
  padding: 80px 0 48px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 48px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.8;
}
.colophon .col span { display: block; opacity: 0.5; margin-bottom: 6px; }
.colophon-mark {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 64px;
  letter-spacing: -0.03em;
  text-transform: none;
  line-height: 1;
  margin-bottom: 12px;
}
.colophon-mark em { color: var(--brass-deep); }

/* ============ BUTTON ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  color: var(--ink);
  text-decoration: none;
  transition: all 120ms ease;
}
.btn::after { content: "→"; font-family: var(--serif); font-size: 16px; }
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.brass { border-color: var(--brass-deep); color: var(--brass-deep); }
.btn.brass:hover { background: var(--brass-deep); color: var(--paper); }

/* ============ FOOTER ROW ============ */
.endrule { border-top: 1px solid var(--rule); margin-top: 60px; padding-top: 28px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; opacity: 0.55; display: flex; justify-content: space-between; }

@media (max-width: 900px) {
  .shell { padding: 0 24px; }
  .hero-grid, .section-head, .body-grid, .pillars, .colophon { grid-template-columns: 1fr; gap: 32px; }
  .section-title { font-size: 36px; }
  .hero h1 { font-size: 60px; }
  .lede { font-size: 22px; }
  .spec-table .row { grid-template-columns: 1fr; gap: 4px; }
}