/* ===================================================================
   shared.css — ZForge website design system (Nostromo Deep palette)
   ===================================================================

   Authoritative tokens + reusable components for every product page,
   tier hub, root index, and the math/theory showcase.

   Palette matches the Gumroad cover renderer and brand_tokens.py:
     #050505  bg          background
     #0d0e0f  bg-soft     panels / abstract cards
     #0b0c0d  bg-card     three-pillar cards
     #e8e6e1  ink         primary text + display type
     #9a958c  ink-soft    secondary text
     #5b5854  ink-faint   eyebrow text / inactive
     #2a2826  rule        hairlines / borders
     #2fb3b8  accent      teal (brand)
     #1d6b6e  accent-dim  damped teal
     #b85f5f  hot         alert / "user must do this" badge

   Fonts: Cobre + Gloock display; Crimson Pro serif body; IBM Plex Mono
   labels; Instrument Sans for caps eyebrows. System fallbacks degrade
   to Georgia + Consolas + sans-serif when those font URIs are absent.
   =================================================================== */

:root {
  --bg: #050505;
  --bg-soft: #0d0e0f;
  --bg-card: #0b0c0d;
  --ink: #e8e6e1;
  --ink-soft: #9a958c;
  --ink-faint: #5b5854;
  --rule: #2a2826;
  --accent: #2fb3b8;
  --accent-dim: #1d6b6e;
  --hot: #b85f5f;
  --amber: #e0b86a;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Crimson Pro", "Georgia", serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--ink); }
::selection { background: var(--accent); color: var(--bg); }

/* ----------------------------- Layout ----------------------------- */

.wrap { max-width: 1280px; margin: 0 auto; padding: 0 64px; }

.mono, .label, .caps, nav, .chip, .footer, .row-h, .meta {
  font-family: "IBM Plex Mono", "Consolas", monospace;
}

/* ----------------------------- Top nav ----------------------------- */

.top {
  position: sticky; top: 0; z-index: 20;
  background: rgba(5,5,5, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.top .wrap {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 18px; padding-bottom: 18px;
}
.brand {
  display: flex; align-items: center; gap: 14px;
  font-family: "Instrument Sans", sans-serif;
  font-size: 11px; letter-spacing: 0.38em;
  color: var(--ink-soft);
  text-transform: uppercase;
}
.brand .square {
  width: 12px; height: 12px;
  background: var(--accent);
}
.brand .pipe { color: var(--rule); }
nav.top-nav {
  display: flex; gap: 28px;
  font-size: 10px; letter-spacing: 0.32em;
  text-transform: uppercase;
}
nav.top-nav a { color: var(--ink-soft); }
nav.top-nav a:hover { color: var(--accent); }

/* ----------------------------- Section frames ----------------------------- */

section { border-bottom: 1px solid var(--rule); padding: 96px 0; position: relative; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 56px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 18px;
}
.section-eyebrow {
  font-family: "Instrument Sans", sans-serif;
  font-size: 10px; letter-spacing: 0.4em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.section-title {
  font-family: "Cobre", "Gloock", serif;
  font-size: 56px; line-height: 1.0; font-weight: normal;
}
.section-meta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px; letter-spacing: 0.3em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

/* ----------------------------- Hero ----------------------------- */

.hero {
  position: relative;
  min-height: 720px;
  background:
    radial-gradient(ellipse at 30% 40%, #0d0e0f 0%, var(--bg) 65%, #020202 100%);
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 28px;
  border: 1px solid #1a1a1a;
  pointer-events: none;
}
.hero-img {
  position: absolute; top: 0; right: 0; bottom: 0; width: 56%;
  background-size: cover; background-position: center right;
  opacity: 0.34;
  filter: grayscale(0.15) contrast(1.05);
  mask-image: linear-gradient(to left, black 50%, transparent 100%);
  -webkit-mask-image: linear-gradient(to left, black 50%, transparent 100%);
}
.hero-img::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to right, rgba(5,5,5,0.85) 0%, rgba(5,5,5,0.4) 35%, transparent 60%);
}
.hero .wrap {
  position: relative; z-index: 2;
  padding-top: 120px; padding-bottom: 120px;
}
.hero .mini-band {
  font-family: "Instrument Sans", sans-serif;
  font-size: 11px; letter-spacing: 0.55em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-bottom: 32px;
}
.hero h1 {
  font-family: "Cobre", "Gloock", "Georgia", serif;
  font-size: 116px;
  line-height: 0.92;
  letter-spacing: -0.01em;
  font-weight: normal;
  margin-bottom: 24px;
}
.hero h1 .accent { color: var(--accent); }
.hero .tagline {
  font-family: "Crimson Pro", serif;
  font-size: 26px;
  line-height: 1.35;
  color: var(--ink);
  max-width: 720px;
  margin-bottom: 18px;
}
.hero .tagline em {
  font-style: italic;
  color: var(--accent);
}
.hero .sub-tagline {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 700px;
  margin-bottom: 48px;
}
.hero .chips {
  display: flex; gap: 14px; flex-wrap: wrap;
  margin-bottom: 36px;
}
.chip {
  font-size: 10px; letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 9px 14px;
  border: 1px solid var(--rule);
}
.chip.live { color: var(--accent); border-color: var(--accent-dim); }
.chip.amber { color: var(--amber); border-color: #5b481f; }
.hero .price {
  display: flex; align-items: baseline; gap: 18px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px; letter-spacing: 0.2em;
  color: var(--ink);
  margin-bottom: 12px;
}
.hero .price strong { color: var(--accent); font-weight: normal; }
.hero .cta-row { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 12px; }
.cta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px; letter-spacing: 0.34em;
  text-transform: uppercase;
  padding: 14px 22px;
  border: 1px solid var(--accent);
  color: var(--accent);
  transition: background 120ms;
}
.cta:hover { background: var(--accent); color: var(--bg); }
.cta.ghost { border-color: var(--rule); color: var(--ink-soft); }
.cta.ghost:hover { background: var(--rule); color: var(--ink); }

/* ----------------------------- Content / markdown body ----------------------------- */

.md-body { color: var(--ink); max-width: 820px; }
.md-body h1, .md-body h2, .md-body h3 {
  font-family: "Cobre", "Gloock", serif;
  font-weight: normal;
  margin: 40px 0 18px;
  line-height: 1.05;
}
.md-body h1 { font-size: 44px; }
.md-body h2 { font-size: 32px; border-top: 1px solid var(--rule); padding-top: 32px; }
.md-body h3 { font-size: 22px; color: var(--ink); }
.md-body p { margin: 12px 0; font-size: 17px; line-height: 1.65; color: var(--ink-soft); }
.md-body p strong, .md-body strong { color: var(--ink); font-weight: normal; font-style: italic; }
.md-body em { color: var(--accent); font-style: italic; }
.md-body ul, .md-body ol { margin: 14px 0 14px 18px; }
.md-body li {
  font-family: "Crimson Pro", serif;
  font-size: 16px; line-height: 1.6;
  color: var(--ink-soft);
  margin: 6px 0; padding-left: 6px;
}
.md-body li::marker { color: var(--accent); }
.md-body code {
  font-family: "IBM Plex Mono", "Consolas", monospace;
  font-size: 13px;
  color: var(--accent);
  background: var(--bg-soft);
  padding: 1px 6px;
  border: 1px solid var(--rule);
}
.md-body pre {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  padding: 18px 22px;
  margin: 18px 0;
  overflow-x: auto;
}
.md-body pre code {
  background: none; border: none; padding: 0;
  color: var(--ink); font-size: 12px;
}
.md-body blockquote {
  border-left: 2px solid var(--accent);
  padding: 14px 20px;
  margin: 18px 0;
  background: var(--bg-soft);
  color: var(--ink-soft);
  font-style: italic;
}
.md-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 20px 0;
  font-size: 14px;
}
.md-body th, .md-body td {
  border: 1px solid var(--rule);
  padding: 10px 14px;
  text-align: left;
}
.md-body th {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px; letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  background: var(--bg-soft);
  font-weight: normal;
}
.md-body td { color: var(--ink-soft); }
.md-body a { color: var(--accent); border-bottom: 1px solid transparent; }
.md-body a:hover { border-bottom-color: var(--accent); }
.md-body hr { border: none; border-top: 1px solid var(--rule); margin: 36px 0; }

/* ----------------------------- Card grids ----------------------------- */

.card-grid { display: grid; gap: 18px; }
.card-grid.cols-2 { grid-template-columns: 1fr 1fr; }
.card-grid.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.card-grid.cols-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  padding: 32px 28px;
  display: flex; flex-direction: column;
  gap: 12px;
  position: relative;
  text-decoration: none;
  color: inherit;
  transition: border-color 120ms;
}
.product-card:hover { border-color: var(--accent); }
.product-card::before {
  content: ""; position: absolute; top: 0; left: 0; width: 28px; height: 1px;
  background: var(--accent);
}
.product-card .tier-tag {
  font-family: "IBM Plex Mono", monospace;
  font-size: 9px; letter-spacing: 0.34em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.product-card .name {
  font-family: "Cobre", "Gloock", serif;
  font-size: 28px; line-height: 1.05;
  color: var(--ink);
}
.product-card .name .accent { color: var(--accent); }
.product-card .tagline {
  font-family: "Crimson Pro", serif;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.5;
  font-style: italic;
}
.product-card .meta {
  margin-top: auto;
  font-family: "IBM Plex Mono", monospace;
  font-size: 9px; letter-spacing: 0.32em;
  color: var(--ink-faint);
  text-transform: uppercase;
  border-top: 1px solid var(--rule);
  padding-top: 12px;
  display: flex; justify-content: space-between;
}
.product-card .meta .live { color: var(--accent); }
.product-card .meta .amber { color: var(--amber); }
.product-card .meta .draft { color: var(--ink-faint); }

/* ----------------------------- Stats strip ----------------------------- */

.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-top: 56px;
}
.stat {
  padding: 28px 24px;
  border-right: 1px solid var(--rule);
}
.stat:last-child { border-right: none; }
.stat .num {
  font-family: "Cobre", "Gloock", serif;
  font-size: 52px;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 8px;
}
.stat .num small {
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.stat .label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px; letter-spacing: 0.3em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

/* ----------------------------- Footer ----------------------------- */

footer {
  padding: 64px 0;
  text-align: center;
}
footer .footer-band {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px; letter-spacing: 0.4em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
footer .footer-band .accent { color: var(--accent); }

/* ----------------------------- Responsive ----------------------------- */
@media (max-width: 960px) {
  .card-grid.cols-2, .card-grid.cols-3, .card-grid.cols-4 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat { border-bottom: 1px solid var(--rule); }
  .hero h1 { font-size: 72px; }
  .section-title { font-size: 36px; }
}

/* ----------------------------- Math page bits ----------------------------- */

.svg-frame {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  padding: 12px;
  margin: 24px 0;
}
.svg-frame svg { display: block; width: 100%; height: auto; }
.svg-frame .caption {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px; letter-spacing: 0.32em;
  color: var(--ink-soft);
  text-transform: uppercase;
  padding: 14px 6px 6px;
  border-top: 1px solid var(--rule);
  margin-top: 12px;
}
.svg-frame .caption .accent { color: var(--accent); }