/* ==========================================================================
   Best Longevity Supplements
   Design concept: a skeptical researcher's marked-up printout — warm paper,
   ink type, and a three-pen annotation system (blue = action, red = flagged
   con, teal = verified pro) plus real highlighter marks over key claims.
   ========================================================================== */

:root {
  --paper: #f1ecde;
  --paper-alt: #e8e1cc;
  --paper-deep: #ded5b8;
  --ink: #221f1a;
  --ink-soft: #6b6455;
  --line: #cbbfa0;

  --pen-blue: #2b4570;
  --pen-blue-dark: #1d3153;
  --pen-red: #ae3b29;
  --pen-teal: #146a63;
  --highlighter: #f2c94c;

  --radius-sm: 4px;
  --radius-md: 6px;

  --font-display: "Zilla Slab", Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --container: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 1px 1px, rgba(34, 31, 26, 0.06) 1px, transparent 0);
  background-size: 5px 5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ---------- Typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  font-weight: 700;
  margin: 0 0 .5em;
  color: var(--ink);
  letter-spacing: -.01em;
}
h1 { font-size: clamp(2.1rem, 4.4vw, 3.3rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; }
h3 { font-size: 1.28rem; }
h4 { font-size: 1.05rem; }
p { margin: 0 0 1em; }

.lede { font-size: 1.12rem; color: var(--ink-soft); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--pen-blue);
  margin-bottom: .8em;
}
.eyebrow::before { content: "["; color: var(--line); }
.eyebrow::after { content: "]"; color: var(--line); }

.section-head { max-width: 720px; margin-inline: auto; text-align: center; margin-bottom: 2.5rem; }

/* Highlighter mark over key claims */
.mark {
  background-image: linear-gradient(100deg, transparent 0%, var(--highlighter) 8%, var(--highlighter) 92%, transparent 100%);
  background-repeat: no-repeat;
  background-position: 0 68%;
  background-size: 100% 55%;
  padding: 0 .05em;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

/* ---------- Buttons (ticket-stub / stamped ink) ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .92rem;
  letter-spacing: .02em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 2px solid var(--ink);
  padding: .9em 1.7em;
  min-height: 44px;
  cursor: pointer;
  background: var(--paper);
  color: var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform .1s ease, box-shadow .1s ease;
}
.btn:hover { transform: translate(1px, 1px); box-shadow: 2px 2px 0 var(--ink); }
.btn:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--ink); }
.btn-primary { background: var(--pen-blue); color: var(--paper); border-color: var(--pen-blue-dark); box-shadow: 3px 3px 0 var(--pen-blue-dark); }
.btn-primary:hover { box-shadow: 2px 2px 0 var(--pen-blue-dark); }
.btn-primary:active { box-shadow: 0 0 0 var(--pen-blue-dark); }
.btn-outline { background: var(--paper); color: var(--ink); }
.btn-block { width: 100%; }
.btn-sm { padding: .6em 1.2em; font-size: .8rem; min-height: 38px; }

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--ink); color: var(--paper); padding: .8em 1.2em; font-family: var(--font-mono);
}
.skip-link:focus { left: 0; }

/* ---------- Disclosure strip ---------- */

.disclosure-strip {
  background: var(--ink);
  color: var(--paper-alt);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .02em;
  text-align: center;
  padding: .55em 1em;
}
.disclosure-strip a { color: var(--highlighter); text-decoration: underline; }

/* ---------- Header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 2px solid var(--ink);
}
.nav {
  display: flex;
  align-items: center;
  padding-block: .9em;
  position: relative;
}
.brand {
  display: flex;
  align-items: center;
  gap: .7em;
  margin-right: auto;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
}
.nav-links { display: flex; gap: 1.7em; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  text-decoration: none; font-family: var(--font-mono); font-weight: 600; font-size: .8rem;
  letter-spacing: .03em; text-transform: uppercase; color: var(--ink-soft);
}
.nav-links a:hover { color: var(--pen-blue); }
.nav-cta { display: flex; align-items: center; gap: 1em; }
.nav-toggle {
  display: none;
  background: var(--paper); border: 2px solid var(--ink); border-radius: var(--radius-sm);
  width: 42px; height: 42px; cursor: pointer;
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after {
  content: ""; display: block; width: 18px; height: 2px; background: var(--ink); margin: 4px auto;
}

/* ---------- Hero (compact: byline first, then title, all above the fold) ---------- */

.hero { padding-block: 2.2rem 1.8rem; }

.byline { display: flex; align-items: center; gap: 1.2rem; margin-bottom: 1.6rem; }
.byline-avatar {
  width: 104px; height: 104px;
  border-radius: 50%;
  border: 3px solid var(--ink);
  background: var(--paper-alt);
  object-fit: cover;
  object-position: center 22%;
  flex-shrink: 0;
}
.byline-name { font-family: var(--font-display); font-weight: 800; font-size: 1.1rem; margin: 0 0 .2em; }
.byline-role { margin: 0; color: var(--ink-soft); font-size: 1.02rem; max-width: 640px; }

.hero-meta { margin-top: .8em; font-family: var(--font-mono); font-size: .78rem; color: var(--ink-soft); }

.author-photo {
  width: auto;
  height: 100%;
  max-width: 320px;
  min-height: 260px;
  object-fit: contain;
  background: var(--paper-alt);
  border: 1px dashed var(--line);
  position: relative;
}
.author-photo::before, .author-photo::after {
  content: "";
  position: absolute;
  top: -10px;
  width: 46px; height: 22px;
  background: rgba(242, 201, 76, .55);
  border: 1px solid rgba(34,31,26,.15);
}
.author-photo::before { left: 14px; transform: rotate(-6deg); }
.author-photo::after { right: 14px; transform: rotate(5deg); }

/* ---------- Ledger strip (trust markers) ---------- */

.ledger-strip {
  display: flex; flex-wrap: wrap; gap: .6em 0;
  justify-content: center;
  margin-top: 2.2rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.ledger-strip span { padding-inline: 1em; position: relative; }
.ledger-strip span + span::before {
  content: "·";
  position: absolute; left: -.15em; top: 0; color: var(--line);
}

/* ---------- Sections generic ---------- */

section { padding-block: 3.6rem; }
.section-alt { background: var(--paper-alt); }

/* ---------- Methodology ledger ---------- */

.method-ledger {
  list-style: none;
  margin: 0; padding: 0;
  max-width: 820px;
  margin-inline: auto;
  border-top: 1px solid var(--line);
}
.method-ledger li {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1.2rem;
  padding: 1.3rem 0;
  border-bottom: 1px dashed var(--line);
}
.m-num {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 600;
  color: var(--ink-soft);
  padding-top: .15em;
}
.method-ledger h3 { margin-bottom: .25em; }
.method-ledger p { margin: 0; color: var(--ink-soft); }

.method-photo-row {
  margin: 2rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.method-photo {
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
  background: var(--paper-alt);
}

/* ---------- Compare grid (all 5 products, side by side, linkable) ---------- */

.compare-grid {
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.compare-grid li:first-child { grid-column: 1 / -1; }
.compare-card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  height: 100%;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--ink);
  background: var(--paper);
  padding: 1.2rem;
  position: relative;
  transition: transform .1s ease, box-shadow .1s ease;
}
.compare-card:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--ink); }
.compare-card.is-winner {
  flex-direction: row;
  align-items: center;
  gap: 1.6rem;
  border-width: 2px;
  padding: 1.6rem 1.8rem;
}
.compare-card.is-winner .compare-thumb {
  width: 220px;
  height: 220px;
  max-width: 100%;
  object-fit: cover;
  background: var(--paper);
  border: 1px solid var(--line);
  flex-shrink: 0;
}
.compare-card.is-winner .rank-score-wrap { margin-left: auto; }
.runner-tag {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--pen-blue);
}

/* Fluid square frame for the 4 non-winner compare cards — avoids aspect-ratio
   entirely; width and padding-top share the same containing-block reference,
   so height always equals width regardless of viewport. */
.thumb-frame {
  position: relative;
  width: 100%;
  padding-top: 100%;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
}
.thumb-frame .compare-thumb {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: none;
}
.rank-name { margin: 0 0 .2em; font-size: 1.4rem; }
.rank-tag { font-size: .92rem; color: var(--ink-soft); margin: 0; }
.rank-score-wrap { text-align: right; }
.rank-stars { color: var(--pen-teal); font-size: 1.3rem; letter-spacing: .05em; }
.rank-score { display: block; font-family: var(--font-mono); font-weight: 700; color: var(--ink); font-size: 1.3rem; }
.compare-card.is-winner .rank-name { font-size: 1.7rem; }
.compare-card.is-winner .rank-score { font-size: 1.6rem; }
.compare-card.is-winner .rank-stars { font-size: 1.5rem; }
.rank-cta { margin-top: .6rem; }

/* Partial star fill — set --fill (e.g. 90% for 4.5/5) via inline style */
.star-rating { position: relative; display: inline-block; }
.star-rating::before { content: "★★★★★"; color: var(--line); }
.star-rating::after {
  content: "★★★★★";
  position: absolute;
  top: 0; left: 0;
  width: var(--fill, 100%);
  overflow: hidden;
  white-space: nowrap;
  color: var(--pen-teal);
}

/* Stamp badge — rotated ink-stamp treatment */
.stamp {
  position: absolute;
  top: -14px; right: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--pen-red);
  border: 2px solid var(--pen-red);
  border-radius: 48% 52% 45% 55% / 55% 45% 58% 42%;
  padding: .5em .85em;
  transform: rotate(-7deg);
  background: rgba(241, 236, 222, .88);
  mix-blend-mode: multiply;
}
.stamp.stamp-winner {
  color: var(--paper);
  background: var(--pen-teal);
  border-color: var(--pen-teal);
  font-size: .85rem;
  padding: .55em 1.05em;
  mix-blend-mode: normal;
  box-shadow: 2px 2px 0 var(--ink);
}

/* ---------- Review cards ---------- */

.review-card {
  padding-block: 2.2rem;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.review-card.is-winner { border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); padding: 2.4rem 1.6rem; background: var(--paper-alt); margin-bottom: .5rem; }
.review-head {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  gap: 1.6rem;
  align-items: center;
  margin-bottom: 1.8rem;
}
.review-thumb {
  width: 200px;
  height: 200px;
  object-fit: cover;
  background: var(--paper);
  border: 1px solid var(--line);
}
.review-rank-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--ink-soft);
  letter-spacing: .04em;
  margin-right: .6em;
  vertical-align: middle;
}
.review-title { display: flex; align-items: baseline; margin-bottom: .35em; }
.review-stars { color: var(--pen-teal); font-size: 1.15rem; }
.review-score { font-family: var(--font-mono); font-weight: 700; margin-left: .6em; font-size: .9rem; }

/* Pros/cons — full-width, stacked (not a cramped two-column grid) */
.pros-cons {
  display: flex;
  flex-direction: column;
  margin-bottom: 1.2rem;
  max-width: 720px;
}
.pros { padding-bottom: 1.4rem; margin-bottom: 1.4rem; border-bottom: 1px dashed var(--line); }
.pros h4, .cons h4 {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  margin-bottom: .8em;
}
.pros h4 { color: var(--pen-teal); }
.cons h4 { color: var(--pen-red); }
.pros ul, .cons ul { list-style: none; margin: 0; padding: 0; }
.pros li, .cons li {
  position: relative;
  padding-left: 1.5em;
  margin-bottom: .6em;
  font-size: .97rem;
  line-height: 1.5;
}
.pros li::before, .cons li::before {
  position: absolute;
  left: 0; top: .1em;
  font-weight: 700;
  font-family: var(--font-mono);
}
.pros li::before { content: "✓"; color: var(--pen-teal); }
.cons li::before { content: "✕"; color: var(--pen-red); }

.review-cta { margin-top: 1.7rem; display: flex; gap: 1em; align-items: center; flex-wrap: wrap; }
.promo-code {
  font-family: var(--font-mono);
  font-size: .78rem; font-weight: 700; color: var(--ink);
  border: 1px dashed var(--line); padding: .5em 1em;
}

/* ---------- Comparison table (ledger) ---------- */

.table-scroll { overflow-x: auto; }
table.compare {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}
table.compare caption { caption-side: top; text-align: left; padding: 0 0 .8em; font-weight: 700; }
table.compare th, table.compare td {
  padding: .9em 1.1rem;
  border-bottom: 1px dashed var(--line);
  text-align: center;
  font-family: var(--font-mono);
  font-size: .88rem;
}
table.compare th:first-child, table.compare td:first-child { text-align: left; font-weight: 600; font-family: var(--font-sans); }
table.compare thead th {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: .03em;
  text-transform: uppercase;
  font-size: .78rem;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 1em;
}
table.compare tbody tr:last-child td { border-bottom: none; }
table.compare td.is-winner-col, table.compare th.is-winner-col { background: rgba(242, 201, 76, .18); }
table.compare .rank-stars, table.compare td { color: var(--pen-teal); }

/* ---------- Buying guide checklist ---------- */

.criteria-list { list-style: none; margin: 1.6em 0 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: .9em 1.8em; }
.criteria-list li { display: flex; gap: .7em; align-items: flex-start; padding-bottom: .7em; border-bottom: 1px dashed var(--line); }
.criteria-list li::before { content: "✓"; color: var(--pen-teal); font-family: var(--font-mono); font-weight: 700; flex-shrink: 0; margin-top: .1em; }

/* ---------- Recap / verdict ---------- */

.recap-box {
  border: 2px solid var(--ink);
  background: var(--paper);
  padding: 2.6rem;
  position: relative;
}
.recap-box .stamp { top: -18px; right: 34px; font-size: .8rem; }
.recap-box a.btn-primary { margin-top: .6em; }

/* ---------- Bio ---------- */

.bio-grid { display: grid; grid-template-columns: auto 1fr; gap: 2.2rem; align-items: stretch; }
.bio-photo-col { display: flex; flex-direction: column; height: 100%; }

/* ---------- FAQ (interview transcript style) ---------- */

.faq-list { max-width: 800px; margin-inline: auto; }
.faq-item {
  border-bottom: 1px solid var(--line);
  margin-bottom: 0;
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 1.2em 0;
  font-weight: 700;
  display: flex;
  gap: .7em;
  align-items: baseline;
  color: var(--ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: "Q.";
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--pen-blue);
  flex-shrink: 0;
}
.faq-item .faq-a { padding: 0 0 1.3em 1.9em; color: var(--ink-soft); position: relative; }
.faq-item .faq-a::before {
  content: "A.";
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--pen-red);
  position: absolute;
  left: 0; top: 0;
}

/* ---------- Disclaimer / disclosure block ---------- */

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

.site-footer { background: var(--ink); color: var(--paper-alt); padding-block: 2.6rem; font-size: .88rem; border-top: 4px solid var(--pen-blue); }
.footer-grid { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1.5rem; align-items: center; }
.footer-grid > span { font-family: var(--font-mono); font-size: .78rem; letter-spacing: .02em; }
.footer-links { list-style: none; display: flex; gap: 1.6em; margin: 0; padding: 0; flex-wrap: wrap; font-family: var(--font-mono); text-transform: uppercase; font-size: .75rem; letter-spacing: .03em; }
.footer-links a { text-decoration: none; color: var(--paper-alt); }
.footer-links a:hover { color: var(--highlighter); }
.footer-fine { margin-top: 1.6rem; font-size: .76rem; color: #a79f8a; max-width: 900px; }
.footer-fine a { color: #cbbfa0; }

/* ---------- Sticky mobile CTA ---------- */

.mobile-cta {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 150;
  background: var(--paper);
  border-top: 2px solid var(--ink);
  padding: .7rem 1rem;
}

/* ---------- Stub pages ---------- */

.stub-page { padding-block: 3rem; max-width: 780px; margin-inline: auto; }
.stub-page h1 { margin-bottom: .3em; }
.stub-page h2 { margin-top: 1.6em; }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .bio-grid { grid-template-columns: 1fr; }
  .bio-photo-col { height: auto; }
  .bio-grid .author-photo { width: 160px; max-width: none; height: 213px; object-fit: cover; object-position: center 18%; flex: none; min-height: 0; }
  .criteria-list { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: block; }
  .nav-links.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 2px solid var(--ink);
    padding: 1em 20px;
    gap: 1em;
  }
  .byline { align-items: flex-start; }
  .compare-grid { grid-template-columns: 1fr; }
  .compare-card.is-winner { flex-direction: column; align-items: flex-start; }
  .compare-card.is-winner .rank-score-wrap { margin-left: 0; }
  .review-head { grid-template-columns: 1fr; text-align: center; justify-items: center; }
  .method-ledger li { grid-template-columns: 40px 1fr; }
  .mobile-cta { display: flex; }
  body { padding-bottom: 68px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}