/* ==========================================================================
   The Intismeran File — editorial explainer
   Palette: warm paper, deep navy ink, clinical teal (combination arm),
   slate (control arm), alert red (risk), hairline sand.
   ========================================================================== */

@font-face {
  font-family: 'Source Serif 4';
  src: url('../fonts/SourceSerif4-var.woff2') format('woff2-variations');
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Source Serif 4';
  src: url('../fonts/SourceSerif4-italic-var.woff2') format('woff2-variations');
  font-weight: 200 900;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Sans';
  src: url('../fonts/IBMPlexSans-var.woff2') format('woff2-variations');
  font-weight: 100 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Mono';
  src: url('../fonts/IBMPlexMono-400.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Mono';
  src: url('../fonts/IBMPlexMono-500.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}

:root {
  --paper: #f7f5f0;
  --paper-2: #f0ede5;
  --card: #fffdf9;
  --ink: #131f2b;
  --ink-soft: #2c3d4c;
  --muted: #5d6c78;
  --faint: #8a97a1;
  --hairline: #ddd7ca;
  --hairline-dark: #c8c1b1;
  --teal: #0b6e63;
  --teal-deep: #084f47;
  --teal-tint: #e2efec;
  --slate: #7e8b96;
  --slate-tint: #eceff1;
  --red: #b0432a;
  --red-tint: #f6e7e2;
  --amber: #a06a08;
  --amber-tint: #f6eeda;
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: 'IBM Plex Sans', -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --measure: 68ch;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--teal); color: #fff; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(247, 245, 240, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.topbar-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 3.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.brand {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.brand .dot { color: var(--teal); }
.topnav {
  margin-left: auto;
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-decoration: none;
  padding: 0.5rem 0.65rem;
  border-radius: 4px;
  white-space: nowrap;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.topnav a:hover, .topnav a:focus-visible { color: var(--ink); background: var(--paper-2); }

.progress-line {
  position: absolute;
  left: 0; bottom: -1px;
  height: 2px;
  width: 100%;
  background: var(--teal);
  transform-origin: 0 50%;
  transform: scaleX(0);
}

/* ---------- shared layout ---------- */
.wrap {
  max-width: 72rem;
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.measure { max-width: var(--measure); }

section { padding: clamp(3.5rem, 9vh, 6.5rem) 0; }
section + section { border-top: 1px solid var(--hairline); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.eyebrow::before {
  content: '';
  width: 1.75rem;
  height: 1px;
  background: var(--teal);
  flex: none;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.12; color: var(--ink); }

h2 {
  font-size: clamp(1.9rem, 4.2vw, 2.9rem);
  letter-spacing: -0.015em;
  margin: 0 0 1.25rem;
  max-width: 22ch;
}
h3 {
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  margin: 2.5rem 0 0.75rem;
}
p { margin: 0 0 1.15rem; }
.lede {
  font-size: clamp(1.15rem, 2.2vw, 1.35rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 60ch;
}
.small { font-size: 0.85rem; color: var(--muted); }

a { color: var(--teal-deep); }
sup.ref a {
  font-family: var(--mono);
  font-size: 0.68em;
  text-decoration: none;
  padding: 0 0.1em;
}

/* ---------- defined terms ---------- */
.term {
  border-bottom: 1px dashed var(--teal);
  cursor: help;
  position: relative;
  text-decoration: none;
}
.term:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }

.tooltip-card {
  position: fixed;
  z-index: 80;
  max-width: 19rem;
  background: var(--ink);
  color: #f2f4f6;
  font-size: 0.85rem;
  line-height: 1.5;
  padding: 0.8rem 0.95rem;
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(10, 20, 30, 0.28);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.18s ease, transform 0.18s ease;
  pointer-events: none;
}
.tooltip-card.on { opacity: 1; transform: translateY(0); pointer-events: auto; }
.tooltip-card .t-term {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #8fd6cc;
  display: block;
  margin-bottom: 0.3rem;
}

/* ---------- hero ---------- */
.hero {
  padding: clamp(3rem, 8vh, 6rem) 0 clamp(3rem, 7vh, 5rem);
  border-bottom: 1px solid var(--hairline);
  background:
    radial-gradient(58rem 30rem at 85% -10%, var(--teal-tint), transparent 60%),
    radial-gradient(40rem 24rem at -10% 20%, #f1ede2, transparent 55%),
    var(--paper);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.4rem);
  letter-spacing: -0.02em;
  margin: 0 0 1.4rem;
  max-width: 15ch;
}
.hero h1 em { font-style: italic; color: var(--teal-deep); }
.hero .dek {
  font-size: clamp(1.1rem, 2vw, 1.28rem);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 54ch;
  margin-bottom: 2rem;
}
.hero-badges { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 2.25rem; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--hairline-dark);
  background: var(--card);
  color: var(--ink-soft);
}
.chip .swatch { width: 0.55rem; height: 0.55rem; border-radius: 50%; flex: none; }
.chip.proven .swatch { background: var(--teal); }
.chip.pending .swatch { background: var(--amber); }
.chip.proven { border-color: #b8d4cd; background: var(--teal-tint); color: var(--teal-deep); }
.chip.pending { border-color: #e2d2ac; background: var(--amber-tint); color: var(--amber); }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  overflow: hidden;
  max-width: 42rem;
}
.hero-stat {
  background: var(--card);
  padding: 1.1rem 1.2rem 1.2rem;
}
.hero-stat .num {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.9rem, 3.6vw, 2.7rem);
  letter-spacing: -0.02em;
  color: var(--teal-deep);
  line-height: 1;
  display: block;
}
.hero-stat .lbl {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-top: 0.55rem;
  line-height: 1.5;
}

.hero-fig { margin: 0; }
.hero-fig svg { width: 100%; height: auto; display: block; }
figcaption, .fig-cap {
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--muted);
  margin-top: 0.9rem;
  max-width: 62ch;
}
.fig-cap .cap-tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  display: block;
  margin-bottom: 0.2rem;
}

/* ---------- cards & grids ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
  align-items: start;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 1.4rem 1.5rem;
}
.card h3 { margin-top: 0; }

.fact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  overflow: hidden;
  margin: 2rem 0;
}
.fact {
  background: var(--card);
  padding: 1.25rem 1.35rem;
}
.fact .k {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 0.45rem;
}
.fact .v { font-weight: 600; font-size: 1.02rem; line-height: 1.45; }
.fact .v small { display: block; font-weight: 400; color: var(--muted); font-size: 0.85rem; margin-top: 0.3rem; }

/* ---------- pull quotes ---------- */
.quote {
  border-left: 3px solid var(--teal);
  padding: 0.25rem 0 0.25rem 1.5rem;
  margin: 2rem 0;
}
.quote blockquote {
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2.3vw, 1.45rem);
  font-style: italic;
  line-height: 1.5;
  margin: 0 0 0.8rem;
  color: var(--ink-soft);
}
.quote cite {
  font-style: normal;
  font-size: 0.85rem;
  color: var(--muted);
}
.quote cite strong { color: var(--ink); font-weight: 600; }

/* ---------- figures ---------- */
.figure {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: clamp(1.25rem, 3vw, 2.25rem);
  margin: 2.25rem 0;
}
.figure h3 { margin-top: 0; }
.figure svg { width: 100%; height: auto; display: block; }
.figure.bleed { background: var(--ink); border-color: var(--ink); color: #e8edf1; }
.figure.bleed h3 { color: #fff; }

/* pipeline steps list (html side) */
.pipeline-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13.5rem, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.pipeline-legend li {
  counter-increment: step;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--muted);
}
.pipeline-legend li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--teal);
  display: block;
  margin-bottom: 0.35rem;
}
.pipeline-legend li strong { color: var(--ink); display: block; font-size: 0.92rem; }

/* ---------- verdict table ---------- */
.verdict-table { width: 100%; border-collapse: collapse; margin: 1.75rem 0; font-size: 0.95rem; }
.verdict-table th, .verdict-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}
.verdict-table th {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 500;
}
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
}
.tag.proven { background: var(--teal-tint); color: var(--teal-deep); }
.tag.pending { background: var(--amber-tint); color: var(--amber); }

/* ---------- timeline ---------- */
.timeline { margin: 2.5rem 0; }

/* ---------- callouts ---------- */
.callout {
  background: var(--paper-2);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--teal);
  border-radius: 0 10px 10px 0;
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  font-size: 0.95rem;
}
.callout.warn { border-left-color: var(--amber); background: var(--amber-tint); }
.callout strong { color: var(--ink); }

/* ---------- sources ---------- */
.sources ol { padding-left: 1.4rem; }
.sources li { margin-bottom: 1rem; font-size: 0.92rem; line-height: 1.6; }
.sources .src-id { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); }
.sources a { word-break: break-word; }

.disclaimer {
  background: var(--ink);
  color: #cfd8de;
  border-radius: 14px;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: 3rem;
}
.disclaimer h3 { color: #fff; margin-top: 0; }
.disclaimer p { font-size: 0.92rem; margin-bottom: 0.8rem; }

footer {
  border-top: 1px solid var(--hairline);
  padding: 2.5rem 0 3.5rem;
  font-size: 0.82rem;
  color: var(--muted);
}

/* horizontally scrollable wide infographics on small screens */
.svg-scroll { width: 100%; }
@media (max-width: 56rem) {
  .svg-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    position: relative;
    border-radius: 8px;
  }
  .svg-scroll .wide-svg { min-width: 640px; width: 640px; max-width: none; }
  .svg-scroll::after {
    content: 'swipe →';
    position: sticky;
    left: calc(100% - 4.5rem);
    bottom: 0.4rem;
    display: block;
    width: 4.2rem;
    text-align: center;
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.08em;
    color: var(--faint);
    background: var(--paper-2);
    border: 1px solid var(--hairline);
    border-radius: 999px;
    padding: 0.15rem 0.3rem;
    pointer-events: none;
  }
}

/* ---------- reveal & motion (JS-enabled only; without JS all content is visible) ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.js .reveal.in { opacity: 1; transform: none; }

.draw-path {
  transition: stroke-dashoffset 1.6s ease;
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .draw-path { transition: none; }
  .tooltip-card { transition: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 56rem) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .hero-fig { max-width: 26rem; }
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .grid-2 > *, .grid-3 > * { min-width: 0; }
  .figure { min-width: 0; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .hero-stat:last-child { grid-column: 1 / -1; }
  body { font-size: 1rem; }
  .verdict-table { display: block; overflow-x: auto; }
  .verdict-table thead, .verdict-table tbody, .verdict-table tr { min-width: 34rem; }
  .verdict-table { -webkit-overflow-scrolling: touch; }
}

@media (max-width: 24rem) {
  .hero-stats { grid-template-columns: 1fr; }
}