/* Strata — a technology radar for the modern data stack.
   A quiet "paper" reference look: warm off-white canvas, deep-teal accent,
   serif display headings over a clean sans body, ochre/clay/cyan rings.
   No dark chrome, no shared blog styles, no external fonts. */

:root {
  --paper:     #fbfaf7;   /* warm off-white canvas */
  --card:      #ffffff;   /* sheets / panels */
  --card-2:    #f4f2ec;   /* nested / inset surfaces */
  --ink:       #1f2430;   /* primary text (dark slate) */
  --ink-soft:  #4a5160;   /* secondary text */
  --ink-faint: #818a99;   /* tertiary text */
  --rule:      #e6e2d8;   /* hairlines */
  --teal:      #0f766e;   /* primary accent (deep teal) */
  --teal-dim:  #0f766e14;

  /* ring colors (light theme) */
  --adopt:  #0f766e;   /* teal-green */
  --trial:  #0e7490;   /* cyan */
  --assess: #b45309;   /* ochre */
  --hold:   #9f1239;   /* clay */

  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", "Times New Roman", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono:  ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --measure: 1040px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 1.5rem; }

/* Header --------------------------------------------------------------- */
.masthead {
  border-bottom: 1px solid var(--rule);
  background: #fbfaf7e6;
  backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 20;
}
.masthead .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-top: 0.9rem; padding-bottom: 0.9rem;
}
.wordmark {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--serif); font-weight: 700; font-size: 1.2rem;
  color: var(--ink); letter-spacing: 0.005em;
}
.wordmark:hover { text-decoration: none; }
.wordmark svg { display: block; }
.wordmark .kicker { color: var(--ink-faint); font-family: var(--mono); font-weight: 400; font-size: 0.78rem; letter-spacing: 0.02em; }
.mainnav { display: flex; gap: 1.4rem; font-size: 0.92rem; }
.mainnav a { color: var(--ink-soft); }
.mainnav a:hover { color: var(--teal); text-decoration: none; }

/* Hero ----------------------------------------------------------------- */
.lede { padding: 3.2rem 0 1.6rem; }
.lede h1 {
  font-family: var(--serif); font-weight: 700;
  font-size: 2.7rem; line-height: 1.08; letter-spacing: -0.015em; margin: 0 0 0.7rem;
}
.lede .tagline { color: var(--teal); font-family: var(--serif); font-style: italic; font-size: 1.18rem; margin: 0 0 1.2rem; }
.lede p { color: var(--ink-soft); max-width: 72ch; margin: 0 0 0.8rem; font-size: 1.05rem; }

/* Ring legend ---------------------------------------------------------- */
.legend {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.8rem;
  margin: 1.8rem 0 2.4rem;
}
.legend-card {
  border: 1px solid var(--rule); border-radius: 10px; background: var(--card);
  padding: 0.9rem 1rem; box-shadow: 0 1px 2px rgba(31,36,48,0.03);
}
.legend-card .label {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--mono); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em;
  font-weight: 600; margin-bottom: 0.4rem;
}
.legend-card .label::before {
  content: ""; width: 0.7rem; height: 0.7rem; border-radius: 2px; flex: none;
}
.legend-card.adopt  .label { color: var(--adopt); }
.legend-card.trial  .label { color: var(--trial); }
.legend-card.assess .label { color: var(--assess); }
.legend-card.hold   .label { color: var(--hold); }
.legend-card.adopt  .label::before { background: var(--adopt); }
.legend-card.trial  .label::before { background: var(--trial); }
.legend-card.assess .label::before { background: var(--assess); }
.legend-card.hold   .label::before { background: var(--hold); }
.legend-card p { margin: 0; font-size: 0.86rem; color: var(--ink-soft); line-height: 1.45; }

/* Radar SVG (quarter-circle strata fan) -------------------------------- */
.radar-plate {
  margin: 0 0 2.6rem; text-align: center;
  border: 1px solid var(--rule); border-radius: 12px; background: var(--card);
  padding: 1.6rem 1rem 1.2rem; box-shadow: 0 1px 2px rgba(31,36,48,0.03);
}
.radar-plate svg { max-width: 560px; width: 100%; height: auto; }
.radar-plate figcaption { color: var(--ink-faint); font-size: 0.82rem; font-family: var(--mono); margin-top: 0.6rem; }

/* Quadrants ------------------------------------------------------------ */
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.4rem; margin-bottom: 3rem; }
.column {
  border: 1px solid var(--rule); border-radius: 12px; background: var(--card);
  padding: 1.3rem 1.4rem 1.5rem; box-shadow: 0 1px 2px rgba(31,36,48,0.03);
}
.column > h2 {
  font-family: var(--serif); font-weight: 700;
  font-size: 1.3rem; margin: 0 0 0.2rem; letter-spacing: -0.01em;
}
.column > .q-note { color: var(--ink-faint); font-size: 0.82rem; font-family: var(--mono); margin: 0 0 1rem; }

.entry { border-top: 1px solid var(--rule); padding: 0.85rem 0 0.2rem; }
.entry:first-of-type { border-top: none; }
.entry .head { display: flex; align-items: baseline; gap: 0.6rem; }
.entry .ring {
  font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.07em;
  font-weight: 600; padding: 0.12rem 0.45rem; border-radius: 4px; flex: none; border: 1px solid transparent;
}
.entry .ring.adopt  { color: var(--adopt);  background: #0f766e12; border-color: #0f766e44; }
.entry .ring.trial  { color: var(--trial);  background: #0e749012; border-color: #0e749044; }
.entry .ring.assess { color: var(--assess); background: #b4530912; border-color: #b4530944; }
.entry .ring.hold   { color: var(--hold);   background: #9f123912; border-color: #9f123944; }
.entry .name { font-weight: 600; font-size: 1rem; color: var(--ink); }
.entry .desc { margin: 0.35rem 0 0; color: var(--ink-soft); font-size: 0.9rem; line-height: 1.5; }
.entry .why  { margin: 0.3rem 0 0; color: var(--ink-faint); font-size: 0.84rem; line-height: 1.45; }
.entry .why b { color: var(--ink-soft); font-weight: 600; }

/* Methodology / prose -------------------------------------------------- */
.prose { max-width: 72ch; }
.prose h2 { font-family: var(--serif); font-weight: 700; font-size: 1.45rem; margin: 2.4rem 0 0.8rem; }
.prose p { color: var(--ink-soft); margin: 0 0 1rem; }
.kicker-rule {
  font-family: var(--mono); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-faint); margin: 2.6rem 0 1rem;
}

/* Footer --------------------------------------------------------------- */
.colophon {
  border-top: 1px solid var(--rule); margin-top: 2rem;
  color: var(--ink-faint); font-size: 0.84rem;
}
.colophon .wrap { display: flex; justify-content: space-between; gap: 1rem; padding-top: 1.4rem; padding-bottom: 2.4rem; }
.colophon a { color: var(--ink-soft); }
.colophon .mono { font-family: var(--mono); }

/* 404 ------------------------------------------------------------------ */
.gap { text-align: center; padding: 5rem 0; }
.gap .code { font-family: var(--serif); font-weight: 700; font-size: 4rem; color: var(--teal); line-height: 1; }
.gap h1 { font-family: var(--serif); font-weight: 700; font-size: 1.4rem; margin: 0.6rem 0 0.6rem; }
.gap p { color: var(--ink-soft); }

/* Mobile --------------------------------------------------------------- */
@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr; }
  .legend { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .lede h1 { font-size: 2.05rem; }
  .masthead .wrap { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .legend { grid-template-columns: 1fr; }
}