/* ============================================================
   CFPS Research — Design System
   Concept: clinical scientific reference. Cool slate surfaces,
   precise cyan-teal accent, monospace for all quantitative data.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

/* the [hidden] attribute must beat component display rules (.card is display:flex,
   which otherwise silently defeats every JS filter on the index pages) */
[hidden] { display: none !important; }

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);

  /* Spacing */
  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem;  --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem;  --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;    --space-24: 6rem;

  /* Radius */
  /* the original used --radius:.125rem — near-square, letterpress feel */
  --radius-sm: 1px; --radius-md: 1px; --radius-lg: 2px;
  --radius-xl: 2px; --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 1000px;
  --content-wide: 1280px;

  --header-h: 92px;

  --font-display: 'Bebas Neue', 'Archivo Narrow', Impact, sans-serif;
  --font-ui: 'Archivo Narrow', 'Helvetica Neue', sans-serif;
  --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

/* ---------- Light ---------- */
:root, [data-theme='light'] {
  /* Warm paper + gold — the original "concrete gold" palette */
  --color-bg: #e8e4dc;
  --color-surface: #f3f0e9;
  --color-surface-2: #f8f6f1;
  --color-surface-offset: #ded9d0;
  --color-surface-offset-2: #d9d3c8;
  --color-divider: rgba(26, 25, 23, 0.2);
  --color-border: #1a1917;

  --color-text: #11100f;
  --color-text-muted: #5a554e;
  --color-text-faint: #7d766c;
  --color-text-inverse: #f3f0e9;

  --color-primary: #b88a32;
  --color-primary-hover: #d0a24a;
  --color-primary-active: #a3782a;
  --color-primary-highlight: #efe6cd;

  /* Evidence tiers, drawn from the original's warm range
     (#0d3f3c / #d8e2df appear verbatim in the original CSS) */
  --ev-fda: #0d3f3c;      --ev-fda-bg: #d8e2df;
  --ev-human: #4b5a2c;    --ev-human-bg: #e2e4d1;
  --ev-early: #8a5a1e;    --ev-early-bg: #f0e5cd;
  --ev-pre: #5a554e;      --ev-pre-bg: #ded9d0;

  --color-warning: #7c432f; --color-warning-bg: #ecdcd4;
  --color-error: #7c432f;   --color-error-bg: #ecdcd4;
  --color-success: #0d3f3c; --color-success-bg: #d8e2df;
  --color-info: #4b5a2c;    --color-info-bg: #e2e4d1;

  /* hard letterpress offsets, not soft blurs */
  --shadow-sm: 1px 1px 0 rgba(17, 16, 15, 0.16);
  --shadow-md: 2px 2px 0 rgba(17, 16, 15, 0.2);
  --shadow-lg: 4px 4px 0 #11100f;

  --grid-line: rgba(17, 16, 15, 0.055);
}

/* ---------- Dark ---------- */
[data-theme='dark'] {
  --color-bg: #15130f;
  --color-surface: #1d1b16;
  --color-surface-2: #24211b;
  --color-surface-offset: #201d18;
  --color-surface-offset-2: #2a2620;
  --color-divider: rgba(232, 228, 220, 0.16);
  --color-border: #4a443a;

  --color-text: #e8e4dc;
  --color-text-muted: #a49c8e;
  --color-text-faint: #7d766a;
  --color-text-inverse: #11100f;

  --color-primary: #d0a24a;
  --color-primary-hover: #e0b662;
  --color-primary-active: #eec97e;
  --color-primary-highlight: #33291533;

  --ev-fda: #86bdb4;      --ev-fda-bg: #14312d80;
  --ev-human: #a8bd7e;    --ev-human-bg: #23291580;
  --ev-early: #d6a856;    --ev-early-bg: #33270e80;
  --ev-pre: #a49c8e;      --ev-pre-bg: #2a262080;

  --color-warning: #c97f62; --color-warning-bg: #33201780;
  --color-error: #c97f62;   --color-error-bg: #33201780;
  --color-success: #86bdb4; --color-success-bg: #14312d80;
  --color-info: #a8bd7e;    --color-info-bg: #23291580;

  --shadow-sm: 1px 1px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 2px 2px 0 rgba(0, 0, 0, 0.55);
  --shadow-lg: 4px 4px 0 rgba(0, 0, 0, 0.6);

  --grid-line: rgba(232, 228, 220, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
  --color-bg: #15130f;
  --color-surface: #1d1b16;
  --color-surface-2: #24211b;
  --color-surface-offset: #201d18;
  --color-surface-offset-2: #2a2620;
  --color-divider: rgba(232, 228, 220, 0.16);
  --color-border: #4a443a;

  --color-text: #e8e4dc;
  --color-text-muted: #a49c8e;
  --color-text-faint: #7d766a;
  --color-text-inverse: #11100f;

  --color-primary: #d0a24a;
  --color-primary-hover: #e0b662;
  --color-primary-active: #eec97e;
  --color-primary-highlight: #33291533;

  --ev-fda: #86bdb4;      --ev-fda-bg: #14312d80;
  --ev-human: #a8bd7e;    --ev-human-bg: #23291580;
  --ev-early: #d6a856;    --ev-early-bg: #33270e80;
  --ev-pre: #a49c8e;      --ev-pre-bg: #2a262080;

  --color-warning: #c97f62; --color-warning-bg: #33201780;
  --color-error: #c97f62;   --color-error-bg: #33201780;
  --color-success: #86bdb4; --color-success-bg: #14312d80;
  --color-info: #a8bd7e;    --color-info-bg: #23291580;

  --shadow-sm: 1px 1px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 2px 2px 0 rgba(0, 0, 0, 0.55);
  --shadow-lg: 4px 4px 0 rgba(0, 0, 0, 0.6);

  --grid-line: rgba(232, 228, 220, 0.05);
  }
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; }

a { color: var(--color-primary); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--color-primary-hover); }

::selection { background: var(--color-primary-highlight); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

a, button, [role='button'], input, textarea, select {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important; scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--content-wide); margin-inline: auto; padding-inline: var(--space-6); }
.wrap-default { max-width: var(--content-default); }
.wrap-narrow { max-width: var(--content-narrow); }
.section { padding-block: clamp(var(--space-12), 6vw, var(--space-24)); }
.section-tight { padding-block: clamp(var(--space-8), 4vw, var(--space-16)); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid var(--color-divider);
}
.header-inner { display: flex; align-items: center; gap: var(--space-6); min-height: var(--header-h); }
.brand { display: flex; align-items: center; gap: var(--space-3); color: var(--color-text); text-decoration: none; flex-shrink: 0; margin-right: auto; }
.brand:hover { color: var(--color-text); }
.brand-mark { color: var(--color-primary); flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.0625rem; letter-spacing: -0.01em; }
.brand-sub { font-family: var(--font-mono); font-size: 0.625rem; color: var(--color-text-faint); letter-spacing: 0.08em; text-transform: uppercase; }

.nav { display: flex; align-items: center; gap: var(--space-1); margin-left: auto; }
.nav a {
  font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted);
  text-decoration: none; padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
}
.nav a:hover { color: var(--color-text); background: var(--color-surface-offset); }
.nav a[aria-current='page'] { color: var(--color-primary); background: var(--color-primary-highlight); }

.icon-btn {
  display: grid; place-items: center; width: 36px; height: 36px;
  border-radius: var(--radius-md); color: var(--color-text-muted);
  border: 1px solid var(--color-border); background: var(--color-surface);
}
.icon-btn:hover { color: var(--color-primary); border-color: var(--color-primary); }

.nav-toggle { display: none; }

@media (max-width: 860px) {
  .nav-toggle { display: grid; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto; flex-direction: column; align-items: stretch;
    background: var(--color-surface); border-bottom: 1px solid var(--color-divider);
    padding: var(--space-3); gap: var(--space-1); box-shadow: var(--shadow-lg);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: var(--space-3) var(--space-4); font-size: var(--text-base); }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  border-bottom: 1px solid var(--color-divider);
  background:
    linear-gradient(to bottom, var(--color-surface-offset), var(--color-bg));
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px),
                    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
  pointer-events: none;
}
.hero-inner { position: relative; padding-block: clamp(var(--space-16), 9vw, var(--space-24)); }

/* Photographic hero — original cfpsresearch.com "concrete gold" lab image */
.hero-photo { background: #14181a; border-bottom: none; }
.hero-photo::before { display: none; }
.hero-photo .hero-bg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: 70% center;
}
.hero-photo::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(100deg, rgba(10,14,16,.93) 0%, rgba(10,14,16,.82) 38%, rgba(10,14,16,.42) 68%, rgba(10,14,16,.28) 100%),
    linear-gradient(to top, rgba(10,14,16,.72), transparent 45%);
}
.hero-photo .hero-inner { z-index: 1; padding-block: clamp(var(--space-20), 11vw, 8.5rem); }
.hero-photo h1 { color: #f4f7f8; }
.hero-photo .hero-lede { color: rgba(230,238,241,.82); }
.hero-photo .eyebrow { color: #7fd3cc; background: rgba(75,176,169,.15); border: 1px solid rgba(127,211,204,.28); }
.btn.btn-on-photo {
  background: rgba(255,255,255,.07); color: #eef4f5;
  border-color: rgba(238,244,245,.3); backdrop-filter: blur(6px);
}
.btn.btn-on-photo:hover { background: rgba(255,255,255,.14); border-color: #7fd3cc; color: #fff; }
@media (max-width: 640px) { .hero-photo .hero-bg { object-position: 62% center; } }

/* Section banner photography */
.banner {
  position: relative; border-radius: var(--radius-xl); overflow: hidden;
  margin-bottom: var(--space-8); border: 1px solid var(--color-border);
  background: var(--color-surface-offset);
}
.banner img { width: 100%; height: clamp(180px, 26vw, 300px); object-fit: cover; object-position: center 60%; }
.banner-tall img { object-position: center 35%; }
.banner::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  box-shadow: inset 0 -60px 70px -40px rgba(12,17,20,.5);
}

/* Specimen seal mark */
.seal-mark {
  width: clamp(56px, 8vw, 84px); height: auto; flex-shrink: 0;
  order: 2; opacity: .92;
}
[data-theme='dark'] .seal-mark { filter: invert(1) hue-rotate(180deg) saturate(1.15); opacity: .85; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .seal-mark { filter: invert(1) hue-rotate(180deg) saturate(1.15); opacity: .85; }
}
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono); font-size: var(--text-xs);
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
}
.hero h1 {
  font-family: var(--font-display); font-size: var(--text-2xl);
  font-weight: 700; letter-spacing: -0.025em; max-width: 22ch;
}
.hero-lede { margin-top: var(--space-5); font-size: var(--text-lg); color: var(--color-text-muted); max-width: 62ch; overflow-wrap: break-word; }
@media (max-width: 640px) {
  :root { --header-h: 76px; }
  .hero-lede { font-size: var(--text-base); max-width: none; }
  .header-inner { gap: var(--space-3); }
  .brand { gap: var(--space-2); }
  .brand-seal { width: 46px; height: 46px; }
  .brand-name { font-size: 1.5rem; }
  .brand-sub { font-size: 0.7rem; letter-spacing: 0.14em; }
}
.hero-actions { margin-top: var(--space-8); display: flex; flex-wrap: wrap; gap: var(--space-3); }

.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 600; text-decoration: none;
  padding: var(--space-3) var(--space-5); border-radius: var(--radius-md);
  border: 1px solid transparent;
}
.btn-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.btn-primary:hover { background: var(--color-primary-hover); color: var(--color-text-inverse); transform: translateY(-1px); }
.btn-ghost { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border); }
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ---------- Stat strip ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1px; background: var(--color-divider); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); overflow: hidden; }
.stat { background: var(--color-surface); padding: var(--space-5) var(--space-5); }
.stat-num { font-family: var(--font-mono); font-size: var(--text-xl); font-weight: 700; color: var(--color-primary); letter-spacing: -0.02em; }
.stat-label { font-size: var(--text-xs); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-top: var(--space-1); }

/* ---------- Section headings ---------- */
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-6); margin-bottom: var(--space-8); flex-wrap: wrap; }
.section-head h2 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700; letter-spacing: -0.02em; }
.section-head p { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: var(--space-2); max-width: 60ch; }
.section-link { font-size: var(--text-sm); font-weight: 600; white-space: nowrap; }

/* ---------- Cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-4); }
.card {
  display: flex; flex-direction: column; gap: var(--space-3);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-5);
  text-decoration: none; color: inherit; height: 100%;
}
a.card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); transform: translateY(-2px); color: inherit; }
.card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-3); }
.card h3 { font-family: var(--font-display); font-size: 1.125rem; font-weight: 700; letter-spacing: -0.01em; }
.card-cat { font-family: var(--font-mono); font-size: 0.6875rem; color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.08em; }
.card-body { font-size: var(--text-sm); color: var(--color-text-muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-foot { margin-top: auto; padding-top: var(--space-3); border-top: 1px solid var(--color-divider); display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); font-family: var(--font-mono); font-size: 0.6875rem; color: var(--color-text-faint); }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-family: var(--font-mono); font-size: 0.625rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.07em;
  padding: 0.2rem var(--space-2); border-radius: var(--radius-full);
  white-space: nowrap; flex-shrink: 0;
}
.ev-fda   { color: var(--ev-fda);   background: var(--ev-fda-bg); }
.ev-human { color: var(--ev-human); background: var(--ev-human-bg); }
.ev-early { color: var(--ev-early); background: var(--ev-early-bg); }
.ev-pre   { color: var(--ev-pre);   background: var(--ev-pre-bg); }

/* ---------- Filter bar ---------- */
.filter-bar { display: flex; flex-direction: column; gap: var(--space-4); margin-bottom: var(--space-8); }
.search-row { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.search-input-wrap { position: relative; flex: 1 1 280px; }
.search-input-wrap svg { position: absolute; left: var(--space-4); top: 50%; transform: translateY(-50%); color: var(--color-text-faint); pointer-events: none; }
input[type='search'], input[type='number'], select {
  width: 100%; background: var(--color-surface); color: var(--color-text);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4); font-size: var(--text-sm);
}
input[type='search'] { padding-left: var(--space-10); }
input:focus, select:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 3px var(--color-primary-highlight); }
select { cursor: pointer; }
.search-row select { flex: 0 1 220px; width: auto; }

.chip-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.chip {
  font-size: var(--text-xs); font-weight: 500; padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full); border: 1px solid var(--color-border);
  background: var(--color-surface); color: var(--color-text-muted);
}
.chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.chip[aria-pressed='true'] { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-text-inverse); }

.result-count { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.08em; }
.empty-state { text-align: center; padding: var(--space-16) var(--space-6); color: var(--color-text-muted); }
.empty-state svg { margin: 0 auto var(--space-4); color: var(--color-text-faint); }

/* ---------- Detail page ---------- */
.breadcrumb { display: flex; align-items: center; gap: var(--space-2); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); margin-bottom: var(--space-5); flex-wrap: wrap; }
.breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-primary); }

.detail-head { border-bottom: 1px solid var(--color-divider); padding-bottom: var(--space-8); margin-bottom: var(--space-10); }
.detail-head h1 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700; letter-spacing: -0.025em; }
.detail-meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); margin-top: var(--space-4); }
.detail-lede { margin-top: var(--space-5); font-size: var(--text-lg); color: var(--color-text-muted); }

.layout-aside { display: grid; grid-template-columns: minmax(0,1fr) 260px; gap: var(--space-12); align-items: start; }
@media (max-width: 960px) { .layout-aside { grid-template-columns: 1fr; gap: var(--space-8); } .toc { display: none; } }

.toc { position: sticky; top: 88px; }
.toc-title { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-text-faint); margin-bottom: var(--space-3); }
.toc ul { list-style: none; display: flex; flex-direction: column; gap: 1px; border-left: 2px solid var(--color-divider); }
.toc a { display: block; font-size: var(--text-sm); color: var(--color-text-muted); text-decoration: none; padding: var(--space-2) var(--space-3); margin-left: -2px; border-left: 2px solid transparent; }
.toc a:hover { color: var(--color-primary); border-left-color: var(--color-primary); }

.block { margin-bottom: var(--space-12); scroll-margin-top: var(--space-20); }
.block > h2 {
  font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700;
  letter-spacing: -0.015em; padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-divider); margin-bottom: var(--space-5);
  display: flex; align-items: center; gap: var(--space-3);
}
.block > h2 .num { font-family: var(--font-mono); font-size: 0.6875rem; color: var(--color-primary); font-weight: 500; }
.block p + p { margin-top: var(--space-4); }
.prose p { max-width: 74ch; }

/* mechanism steps */
.steps { display: flex; flex-direction: column; gap: var(--space-4); }
.step { display: grid; grid-template-columns: 40px minmax(0,1fr); gap: var(--space-4); }
.step-num { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 700; color: var(--color-primary); background: var(--color-primary-highlight); border-radius: var(--radius-md); display: grid; place-items: center; height: 40px; }
.step h3 { font-size: var(--text-base); font-weight: 700; margin-bottom: var(--space-1); }
.step p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* evidence items */
.ev-list { display: flex; flex-direction: column; gap: var(--space-4); }
.ev-item { background: var(--color-surface); border: 1px solid var(--color-border); border-left: 3px solid var(--color-primary); border-radius: var(--radius-md); padding: var(--space-4) var(--space-5); }
.ev-item h3 { font-size: var(--text-base); font-weight: 700; margin-bottom: var(--space-2); }
.ev-item p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* known / unknown */
.two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-5); }
.panel { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-5); }
.panel-title { font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.09em; margin-bottom: var(--space-4); display: flex; align-items: center; gap: var(--space-2); }
.panel-known .panel-title { color: var(--color-success); }
.panel-unknown .panel-title { color: var(--color-warning); }
.tick-list { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.tick-list li { display: grid; grid-template-columns: 18px minmax(0,1fr); gap: var(--space-3); font-size: var(--text-sm); color: var(--color-text-muted); }
.tick-list svg { margin-top: 4px; }
.panel-known svg { color: var(--color-success); }
.panel-unknown svg { color: var(--color-warning); }

/* dosing */
.dose-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1px; background: var(--color-divider); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); overflow: hidden; }
.dose-cell { background: var(--color-surface); padding: var(--space-5); }
.dose-label { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--color-text-faint); margin-bottom: var(--space-2); }
.dose-value { font-family: var(--font-mono); font-size: var(--text-base); font-weight: 700; color: var(--color-text); }

/* callout */
.callout { border-radius: var(--radius-lg); padding: var(--space-5); border: 1px solid; display: grid; grid-template-columns: 20px minmax(0,1fr); gap: var(--space-4); font-size: var(--text-sm); }
.callout svg { margin-top: 2px; }
.callout-warning { background: var(--color-warning-bg); border-color: color-mix(in srgb, var(--color-warning) 30%, transparent); color: var(--color-text); }
.callout-warning svg { color: var(--color-warning); }
.callout-info { background: var(--color-info-bg); border-color: color-mix(in srgb, var(--color-info) 30%, transparent); color: var(--color-text); }
.callout-info svg { color: var(--color-info); }
.callout-success { background: var(--color-success-bg); border-color: color-mix(in srgb, var(--color-success) 30%, transparent); color: var(--color-text); }
.callout-success svg { color: var(--color-success); }
.callout strong { display: block; margin-bottom: var(--space-1); }

/* comparison */
.compare { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; }
.compare-head { padding: var(--space-4) var(--space-5); border-bottom: 1px solid var(--color-divider); background: var(--color-surface-offset); font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); }
.compare-head strong { color: var(--color-primary); font-family: var(--font-body); font-size: var(--text-sm); letter-spacing: 0; text-transform: none; }
.compare-row { padding: var(--space-5); border-bottom: 1px solid var(--color-divider); }
.compare-row:last-child { border-bottom: none; }
.compare-row .k { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--color-text-faint); margin-bottom: var(--space-2); }
.compare-row .v { font-size: var(--text-sm); color: var(--color-text-muted); }

/* glossary */
.glossary { display: flex; flex-direction: column; gap: 1px; background: var(--color-divider); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); overflow: hidden; }
.gl-item { background: var(--color-surface); padding: var(--space-4) var(--space-5); }
.gl-term { font-weight: 700; font-size: var(--text-sm); margin-bottom: var(--space-1); }
.gl-def { font-size: var(--text-sm); color: var(--color-text-muted); }

/* sources */
.src-list { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.src-item { display: flex; align-items: flex-start; gap: var(--space-3); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); }
.src-type { font-family: var(--font-mono); font-size: 0.5625rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-primary); background: var(--color-primary-highlight); padding: 0.2rem var(--space-2); border-radius: var(--radius-sm); flex-shrink: 0; margin-top: 2px; }
.src-item a { font-size: var(--text-sm); font-weight: 500; }

/* quiz */
.quiz { display: flex; flex-direction: column; gap: var(--space-4); }
.q-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-5); }
.q-text { font-weight: 600; font-size: var(--text-sm); margin-bottom: var(--space-4); display: grid; grid-template-columns: auto minmax(0,1fr); gap: var(--space-3); }
.q-text .qn { font-family: var(--font-mono); font-size: 0.6875rem; color: var(--color-primary); }
.q-opts { display: flex; flex-direction: column; gap: var(--space-2); }
.q-opt {
  text-align: left; display: grid; grid-template-columns: 22px minmax(0,1fr); gap: var(--space-3);
  font-size: var(--text-sm); padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: var(--color-surface-2); color: var(--color-text-muted);
}
.q-opt .letter { font-family: var(--font-mono); font-size: 0.6875rem; color: var(--color-text-faint); }
.q-opt:hover:not([disabled]) { border-color: var(--color-primary); color: var(--color-text); }
.q-opt.correct { border-color: var(--color-success); background: var(--color-success-bg); color: var(--color-text); }
.q-opt.correct .letter { color: var(--color-success); }
.q-opt.wrong { border-color: var(--color-error); background: var(--color-error-bg); color: var(--color-text); }
.q-opt.wrong .letter { color: var(--color-error); }
.q-rationale { margin-top: var(--space-4); font-size: var(--text-sm); color: var(--color-text-muted); padding: var(--space-4); background: var(--color-surface-offset); border-radius: var(--radius-md); border-left: 3px solid var(--color-primary); }
.q-rationale[hidden] { display: none; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); }
table.data { font-size: var(--text-sm); min-width: 480px; }
table.data th, table.data td { padding: var(--space-3) var(--space-4); text-align: left; border-bottom: 1px solid var(--color-divider); }
table.data th { background: var(--color-surface-offset); font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); font-weight: 500; white-space: nowrap; }
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover { background: var(--color-surface-offset); }
table.data td.mono { font-family: var(--font-mono); }

/* ---------- Protocol ---------- */
.proto-hero { display: flex; align-items: center; gap: var(--space-4); }
.proto-icon { font-size: 2rem; line-height: 1; }
.timeline { display: flex; flex-direction: column; gap: 0; }
.tl-item { display: grid; grid-template-columns: 130px minmax(0,1fr); gap: var(--space-5); padding-bottom: var(--space-6); position: relative; }
.tl-item:not(:last-child)::before { content: ''; position: absolute; left: 137px; top: 22px; bottom: 0; width: 1px; background: var(--color-divider); }
.tl-week { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 700; color: var(--color-primary); text-align: right; padding-top: 3px; }
.tl-body { position: relative; padding-left: var(--space-6); font-size: var(--text-sm); color: var(--color-text-muted); }
.tl-body::before { content: ''; position: absolute; left: -4px; top: 7px; width: 9px; height: 9px; border-radius: 50%; background: var(--color-primary); box-shadow: 0 0 0 3px var(--color-bg); }
@media (max-width: 640px) {
  .tl-item { grid-template-columns: 1fr; gap: var(--space-2); }
  .tl-item::before { display: none; }
  .tl-week { text-align: left; }
  .tl-body { padding-left: 0; }
  .tl-body::before { display: none; }
}

.pep-row { display: grid; grid-template-columns: minmax(0,1.1fr) repeat(3, minmax(0,1fr)); gap: var(--space-4); padding: var(--space-5); border-bottom: 1px solid var(--color-divider); }
.pep-row:last-child { border-bottom: none; }
.pep-row .pname { font-weight: 700; font-size: var(--text-base); }
.pep-row .pk { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-faint); margin-bottom: var(--space-1); }
.pep-row .pv { font-family: var(--font-mono); font-size: var(--text-sm); }
.pep-row .pnotes { grid-column: 1 / -1; font-size: var(--text-sm); color: var(--color-text-muted); padding-top: var(--space-3); border-top: 1px dashed var(--color-divider); }
@media (max-width: 760px) { .pep-row { grid-template-columns: 1fr 1fr; } }

.meta-strip { display: flex; flex-wrap: wrap; gap: var(--space-6); padding: var(--space-5); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.meta-strip .m { display: flex; flex-direction: column; gap: var(--space-1); }
.meta-strip .mk { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--color-text-faint); }
.meta-strip .mv { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 700; }

/* ---------- Calculator ---------- */
.calc { display: grid; grid-template-columns: minmax(0, 360px) minmax(0,1fr); gap: var(--space-8); align-items: start; }
@media (max-width: 900px) { .calc { grid-template-columns: 1fr; } }
.calc-form { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-5); position: sticky; top: 88px; }
@media (max-width: 900px) { .calc-form { position: static; } }
.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field label { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--color-text-muted); }
.field .hint { font-size: var(--text-xs); color: var(--color-text-faint); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }

.calc-out { display: flex; flex-direction: column; gap: var(--space-5); }
.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1px; background: var(--color-divider); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); overflow: hidden; }
.result-cell { background: var(--color-surface); padding: var(--space-5); }
.result-cell.hero-cell { background: var(--color-primary-highlight); }
.result-label { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--color-text-faint); margin-bottom: var(--space-2); }
.result-cell.hero-cell .result-label { color: var(--color-primary); }
.result-value { font-family: var(--font-mono); font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.02em; }
.result-cell.hero-cell .result-value { color: var(--color-primary); }
.result-unit { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); margin-left: 2px; }

.syringe { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-5); }
.syringe-bar { position: relative; height: 34px; background: var(--color-surface-offset-2); border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; }
.syringe-fill { position: absolute; inset: 0 auto 0 0; background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover)); width: 0; transition: width 300ms cubic-bezier(0.16,1,0.3,1); }
.syringe-ticks { display: flex; justify-content: space-between; margin-top: var(--space-2); font-family: var(--font-mono); font-size: 0.5625rem; color: var(--color-text-faint); }
.formula { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-muted); background: var(--color-surface-offset); padding: var(--space-4); border-radius: var(--radius-md); border-left: 3px solid var(--color-primary); overflow-x: auto; }
.formula div + div { margin-top: var(--space-2); }

/* ---------- Article ---------- */
.article-body > * + * { margin-top: var(--space-5); }
.article-body h2 { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700; margin-top: var(--space-10); padding-bottom: var(--space-2); border-bottom: 1px solid var(--color-divider); }
.article-body p { font-size: var(--text-base); color: var(--color-text); max-width: 72ch; }
.article-body ul { display: flex; flex-direction: column; gap: var(--space-2); padding-left: var(--space-5); max-width: 72ch; }
.article-body li { font-size: var(--text-base); }
.article-meta { display: flex; flex-wrap: wrap; gap: var(--space-4); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); }
.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-5); }
.tag { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--color-text-muted); background: var(--color-surface-offset); border: 1px solid var(--color-divider); padding: 0.2rem var(--space-2); border-radius: var(--radius-sm); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-divider); background: var(--color-surface-offset); margin-top: var(--space-20); }
.footer-inner { padding-block: var(--space-12); display: grid; grid-template-columns: minmax(0,1.4fr) repeat(auto-fit, minmax(140px, 1fr)); gap: var(--space-8); }
.footer-brand p { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-4); max-width: 42ch; }
.footer-col h4 { font-family: var(--font-mono); font-size: 0.625rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-text-faint); margin-bottom: var(--space-4); }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a { font-size: var(--text-sm); color: var(--color-text-muted); text-decoration: none; }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom { border-top: 1px solid var(--color-divider); padding-block: var(--space-5); display: flex; flex-wrap: wrap; gap: var(--space-4); justify-content: space-between; font-size: var(--text-xs); color: var(--color-text-faint); }

.disclaimer { background: var(--color-warning-bg); border: 1px solid color-mix(in srgb, var(--color-warning) 30%, transparent); border-radius: var(--radius-lg); padding: var(--space-5); font-size: var(--text-sm); display: grid; grid-template-columns: 20px minmax(0,1fr); gap: var(--space-4); }
.disclaimer svg { color: var(--color-warning); margin-top: 2px; }
.disclaimer strong { display: block; margin-bottom: var(--space-1); }


/* ============================================================
   Original cfpsresearch.com typographic system
   Bebas Neue display / Archivo Narrow UI / Source Serif 4 prose
   / IBM Plex Mono data. Hard offset shadows, 1px hairline rules.
   ============================================================ */

h1, h2, h3, h4, .card h3, .hero-photo h1 {
  font-family: var(--font-display);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.015em;
  line-height: 0.87;
}
h1, .hero-photo h1 { letter-spacing: 0.01em; }
h4 { font-family: var(--font-ui); font-weight: 700; text-transform: uppercase;
     letter-spacing: 0.1em; line-height: 1.15; }
.card h3 { font-size: 1.5rem; letter-spacing: 0.015em; }

/* prose stays serif for readability */
p, li, dd, blockquote, .card-body, .hero-lede, td { font-family: var(--font-body); }

/* UI chrome: labels, nav, buttons, chips */
.nav-link, .btn, .chip, .pill, .stamp, .eyebrow, .cg-label, label, th,
.result-count, .breadcrumb, select, input, button, .tag {
  font-family: var(--font-ui);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-weight: 700;
}
.btn { font-size: 0.8rem; }
input, select { letter-spacing: 0.04em; font-weight: 500; text-transform: none; }
.card-cat, .card-foot, .stat-value, .mono, code, kbd { font-family: var(--font-mono); }
.card-cat, .card-foot { letter-spacing: 0.06em; }

/* kicker / eyebrow in the original's burnt sienna */
.eyebrow { color: #7c432f; letter-spacing: 0.16em; font-size: 0.75rem; }
[data-theme='dark'] .eyebrow { color: #c97f62; }
@media (prefers-color-scheme: dark) { :root:not([data-theme]) .eyebrow { color: #c97f62; } }
.hero-photo .eyebrow {
  color: #e6c982; background: rgba(184, 138, 50, 0.16);
  border: 1px solid rgba(230, 201, 130, 0.4);
}

/* letterpress interaction — the original .cg-button / .cg-card-lift behaviour */
.btn { border: 1px solid var(--color-border); }
.btn-primary { background: var(--color-primary); color: #11100f; }
.btn-primary:hover {
  background: var(--color-primary-hover); color: #11100f;
  transform: translate(-2px, -2px); box-shadow: 3px 3px 0 var(--color-border);
}
.btn:active { transform: translate(0) scale(0.98); box-shadow: none; }
.btn.btn-on-photo:hover {
  transform: translate(-2px, -2px); box-shadow: 3px 3px 0 #b88a32;
}
.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 4px 4px 0 var(--color-border);
  border-color: var(--color-border);
}
input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--color-primary); outline-offset: 2px;
}

/* gold data figures, matching .cg-index */
.stat-value { color: var(--color-primary); }

/* brand lockup — original used the specimen seal in a circle, not a flask mark */
.brand { display: inline-flex; align-items: center; gap: var(--space-3); text-decoration: none; }
.brand-seal {
  width: clamp(54px, 6.2vw, 74px); height: clamp(54px, 6.2vw, 74px);
  border-radius: 50%; object-fit: cover; flex-shrink: 0;
  border: 1px solid var(--color-border);
}
[data-theme='dark'] .brand-seal { filter: invert(1) hue-rotate(180deg) saturate(1.1); }
@media (prefers-color-scheme: dark) { :root:not([data-theme]) .brand-seal { filter: invert(1) hue-rotate(180deg) saturate(1.1); } }
.brand-name { font-family: var(--font-display); font-size: clamp(1.6rem, 2.4vw, 2.05rem); letter-spacing: 0.02em;
  text-transform: uppercase; line-height: 0.9; color: var(--color-text); white-space: nowrap; }
.brand-sub { font-family: var(--font-ui); font-size: clamp(0.75rem, 1vw, 0.875rem); font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--color-primary); white-space: nowrap; }

/* numbered nav, matching the original 00–04 index */
.nav-link { display: inline-flex; align-items: baseline; gap: 0.4rem; }
.nav-idx { font-family: var(--font-mono); font-size: 0.625rem; letter-spacing: 0.06em;
  color: var(--color-primary); font-weight: 500; }
.nav-link[aria-current='page'] .nav-idx { color: inherit; }

/* solid hairline header rule, as the original */
.site-header { border-bottom: 1px solid var(--color-border); }