/* INTP Atlas — design system
   Positioning: PDB's database utility + Wikipedia's density + Letterboxd's finish.
   Dark, violet-accented, typography-first, zero JS. */

:root {
  --bg: #0e0f13;
  --surface: #15171e;
  --surface-2: #1a1d27;
  --border: #262a37;
  --border-soft: #1f2330;
  --text: #e9ebf4;
  --muted: #9aa1b6;
  --faint: #6b7288;
  --accent: #a78bfa;
  --accent-dim: #7c6bd9;
  --accent-soft: rgba(167, 139, 250, 0.12);
  --green: #34d399;
  --red: #f87171;
  --radius: 12px;
  --radius-sm: 8px;
  --maxw: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1200px 500px at 70% -10%, rgba(124, 107, 217, 0.09), transparent 60%),
    radial-gradient(900px 400px at 10% 0%, rgba(56, 189, 248, 0.05), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

::selection { background: rgba(167, 139, 250, 0.35); }

/* ---------------------------------------------------------------- header */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(14, 15, 19, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.head-in { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 18px; letter-spacing: 0.2px; color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, #6d5bd0, #3f3670);
  color: #efeaff; font-family: Georgia, serif; font-size: 18px; font-weight: 700;
}
.site-nav { display: flex; gap: 4px; }
.site-nav a {
  color: var(--muted); font-size: 14.5px; font-weight: 500;
  padding: 8px 13px; border-radius: 8px;
}
.site-nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.site-nav a.active { color: var(--text); background: var(--accent-soft); }

/* ------------------------------------------------------------------ main */
main { padding: 40px 24px 72px; min-height: 60vh; }

.eyebrow {
  color: var(--accent); font-size: 12.5px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 10px;
}

/* ------------------------------------------------------------------ hero */
.hero { padding: 56px 0 44px; max-width: 780px; }
.hero.small { padding: 80px 0; }
.hero h1 {
  font-size: clamp(34px, 5.4vw, 54px);
  line-height: 1.12; letter-spacing: -0.02em; font-weight: 800;
  margin-bottom: 18px;
}
.hero .lede { font-size: 18.5px; color: var(--muted); max-width: 640px; }
.cta-row { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px;
  font-weight: 600; font-size: 15px; line-height: 1;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn.solid { background: var(--accent); color: #16121f; box-shadow: 0 6px 22px rgba(167, 139, 250, 0.25); }
.btn.solid:hover { background: #b9a1ff; }
.btn.ghost { border: 1px solid var(--border); color: var(--text); background: var(--surface); }
.btn.ghost:hover { border-color: var(--accent-dim); }
.btn.sm { padding: 8px 14px; font-size: 13.5px; border-radius: 8px; }

/* --------------------------------------------------------------- layout */
.page-head { max-width: 780px; margin: 26px 0 30px; }
.page-head h1 { font-size: clamp(30px, 4.2vw, 42px); line-height: 1.15; letter-spacing: -0.02em; }
.lede { color: var(--muted); font-size: 17.5px; margin-top: 12px; }

.grid { display: grid; gap: 18px; margin: 24px 0; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.sec-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.related { margin: 44px 0; }
.related > h2 {
  font-size: 21px; letter-spacing: -0.01em; margin-bottom: 6px;
}

/* ----------------------------------------------------------------- cards */
.card {
  display: block; background: var(--surface);
  border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 20px 20px 18px; position: relative;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover {
  text-decoration: none; border-color: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.card h3 { font-size: 16.5px; line-height: 1.35; margin-bottom: 8px; letter-spacing: -0.01em; }
.card p { color: var(--muted); font-size: 14px; line-height: 1.55; }
.card .flag {
  position: absolute; top: -10px; right: 14px;
  background: var(--accent); color: #16121f;
  font-size: 11px; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 3px 10px; border-radius: 20px;
}

.char-card-top { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.char-card-top h3 { margin-bottom: 2px; }
.franchise { color: var(--faint); font-size: 12.5px; }

/* ---------------------------------------------------------------- badges */
.badge {
  --c: #94a3b8;
  display: inline-flex; align-items: center;
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em;
  padding: 4px 10px; border-radius: 20px;
  color: var(--c);
  background: color-mix(in srgb, var(--c) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--c) 38%, transparent);
}
.badge-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 10px 0; }
.badge-row.big { margin: 14px 0; }
.badge-row.big .badge { font-size: 14px; padding: 6px 14px; }
.badge-vs { color: var(--faint); border: none; background: none; font-weight: 500; }
.agree { color: var(--green); font-size: 14px; font-weight: 600; }

/* ------------------------------------------------------------- monograms */
.monogram {
  display: inline-flex; align-items: center; justify-content: center;
  color: rgba(255, 255, 255, 0.88); font-family: Georgia, serif; font-weight: 700;
  border-radius: 14px; flex: none;
}
.mo-md { width: 52px; height: 52px; font-size: 24px; }
.mo-lg { width: 96px; height: 96px; font-size: 44px; border-radius: 20px; }

/* ------------------------------------------------------------ confidence */
.confidence { display: flex; align-items: center; gap: 5px; margin-top: 12px; }
.confidence .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--border); display: inline-block;
}
.confidence .dot.on { background: var(--accent); box-shadow: 0 0 8px rgba(167, 139, 250, 0.5); }
.confidence span { color: var(--faint); font-size: 12.5px; margin-left: 7px; }

/* ---------------------------------------------------------- breadcrumbs */
.crumbs { color: var(--faint); font-size: 13.5px; margin: 18px 0 22px; }
.crumbs a { color: var(--muted); }
.crumbs .sep { margin: 0 8px; color: var(--border); }

/* ---------------------------------------------------------- typing hero */
.typing-hero {
  background: var(--surface); border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 20px 22px; margin: 22px 0;
}
.compare { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }
.cmp-label { color: var(--faint); font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 5px; }
.cmp-type { font-size: 30px; font-weight: 800; color: var(--c); letter-spacing: 0.02em; }
.cmp-type.strike {
  position: relative; color: var(--faint); font-weight: 600;
}
.cmp-type.strike::after {
  content: ""; position: absolute; left: -4px; right: -4px; top: 52%;
  height: 3px; background: var(--red); opacity: 0.75; border-radius: 2px;
  transform: rotate(-4deg);
}
.cmp-arrow { color: var(--faint); font-size: 24px; }

/* --------------------------------------------------------------- article */
.prose-wrap { max-width: 780px; }
.article-head { margin: 10px 0 26px; }
.article-head h1 {
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1.14; letter-spacing: -0.02em; font-weight: 800;
  margin-bottom: 14px;
}
.article-meta {
  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;
  color: var(--faint); font-size: 13.5px; margin-top: 16px;
}
.article-meta .kw { color: var(--accent-dim); font-style: italic; }

.prose { font-size: 17px; }
.prose p { margin: 0 0 18px; color: #cfd3e1; }
.prose h2 {
  font-size: 25px; letter-spacing: -0.015em; margin: 42px 0 14px; line-height: 1.25;
  padding-top: 26px; border-top: 1px solid var(--border-soft);
}
.prose h3 { font-size: 19px; margin: 30px 0 10px; color: var(--text); }
.prose ul, .prose ol { margin: 0 0 18px; padding-left: 24px; color: #cfd3e1; }
.prose li { margin-bottom: 7px; }
.prose li::marker { color: var(--accent-dim); }
.prose a { border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.prose a:hover { border-bottom-color: var(--accent); }
.prose strong { color: var(--text); }
.prose hr { border: none; border-top: 1px solid var(--border-soft); margin: 30px 0; }
.prose blockquote {
  border-left: 3px solid var(--accent-dim); padding: 6px 0 6px 18px;
  color: var(--muted); font-style: italic; margin: 0 0 18px;
}
.prose code {
  background: var(--surface-2); border: 1px solid var(--border-soft);
  border-radius: 6px; padding: 2px 7px; font-size: 0.86em;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  color: #c9c2f0;
}
.prose table {
  width: 100%; border-collapse: collapse; margin: 6px 0 22px; font-size: 14.5px;
}
.prose th {
  text-align: left; color: var(--muted); font-size: 12.5px;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 10px 12px; border-bottom: 1px solid var(--border);
}
.prose td { padding: 11px 12px; border-bottom: 1px solid var(--border-soft); color: #cfd3e1; }
.prose tr:last-child td { border-bottom: none; }
.prose tbody tr:hover { background: rgba(167, 139, 250, 0.04); }

/* ------------------------------------------------------------------- toc */
.toc {
  background: var(--surface); border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 14px 18px; margin: 24px 0 30px;
}
.toc summary {
  cursor: pointer; color: var(--muted); font-size: 13px;
  font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
}
.toc-links { display: flex; flex-direction: column; gap: 8px; padding-top: 12px; }
.toc-links a { color: var(--muted); font-size: 14.5px; }
.toc-links a:hover { color: var(--accent); }

/* --------------------------------------------------------------- callouts */
.callout {
  background: var(--accent-soft); border: 1px solid rgba(167, 139, 250, 0.3);
  border-radius: var(--radius); padding: 18px 22px; margin: 8px 0 24px;
}
.callout h2 {
  border: none; padding: 0; margin: 0 0 8px;
  font-size: 15px; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--accent);
}

.verdict-card {
  background: linear-gradient(160deg, rgba(167, 139, 250, 0.1), rgba(56, 189, 248, 0.05));
  border: 1px solid rgba(167, 139, 250, 0.35);
  border-radius: var(--radius); padding: 24px 26px; margin: 36px 0 8px;
}
.verdict-head {
  color: var(--accent); font-size: 12.5px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 6px;
}
.verdict-card p { color: #d6d9e6; margin: 14px 0 18px; }

.method-strip {
  display: flex; align-items: center; justify-content: space-between; gap: 26px;
  background: var(--surface); border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 28px 30px; margin: 44px 0 8px; flex-wrap: wrap;
}
.method-strip h2 { font-size: 21px; margin-bottom: 8px; }
.method-strip p { color: var(--muted); max-width: 560px; font-size: 15px; }

/* -------------------------------------------------------------- evidence */
.evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 20px 0 26px; }
.ev-col {
  background: var(--surface); border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 18px 20px;
}
.ev-col h3 { font-size: 14px; margin: 0 0 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.ev-for { color: var(--green); }
.ev-against { color: var(--red); }
.ev-col ul { margin: 0; padding-left: 20px; font-size: 14.5px; color: #c4c8d8; }
.ev-col li { margin-bottom: 8px; }

/* ----------------------------------------------------------- entity page */
.entity-hero { display: flex; align-items: center; gap: 26px; margin: 16px 0 8px; }
.entity-hero h1 { font-size: clamp(32px, 4.6vw, 46px); letter-spacing: -0.02em; line-height: 1.1; }
.entity-hero .lede { margin-top: 8px; font-size: 16.5px; }

/* ---------------------------------------------------------------- footer */
.site-foot {
  border-top: 1px solid var(--border-soft);
  background: #0b0c10; padding: 46px 0 30px; margin-top: 40px;
}
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; }
.foot-brand { margin-bottom: 10px; }
.site-foot p { color: var(--faint); font-size: 13.5px; max-width: 300px; }
.site-foot h4 {
  color: var(--muted); font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 12px;
}
.site-foot a {
  display: block; color: var(--faint); font-size: 13.5px; margin-bottom: 8px;
}
.site-foot a:hover { color: var(--text); text-decoration: none; }
.foot-note {
  color: #4d5468; font-size: 12px; margin-top: 36px;
  border-top: 1px solid var(--border-soft); padding-top: 18px;
}

/* ------------------------------------------------------------ responsive */
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .head-in { flex-direction: column; height: auto; padding: 12px 0; gap: 10px; }
  .site-nav { flex-wrap: wrap; justify-content: center; }
  .evidence-grid { grid-template-columns: 1fr; }
  .hero { padding: 36px 0 30px; }
  .entity-hero { flex-direction: column; align-items: flex-start; gap: 18px; }
  .foot-grid { grid-template-columns: 1fr; }
  .method-strip { padding: 22px; }
}