:root {
  --ink: #17202a;
  --muted: #667085;
  --line: #e4e7ec;
  --paper: #ffffff;
  --soft: #f4f6f8;
  --blue: #0c6e8a;
  --red: #e81a41;
  --red-dark: #c91538;
  --quiz-bg: #f7f8fa;
  --signal-navy: #102d38;
  --signal-mint: #dff3ef;
  --signal-gold: #c28b35;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, Arial, sans-serif; }
a { color: inherit; }
img { display: block; max-width: 100%; }
button, input { font: inherit; }

.container { width: calc(100% - 32px); max-width: 1024px; margin-inline: auto; }
.article-container { width: calc(100% - 32px); max-width: 896px; margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.97); }
.site-header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .08em; text-decoration: none; }
.logo.signal-logo { color: var(--signal-navy); font-family: Merriweather, Georgia, serif; letter-spacing: -.02em; text-transform: none; }
.signal-mark { display: grid; grid-template-columns: repeat(4, 3px); align-items: center; gap: 3px; width: 22px; height: 26px; }
.signal-mark i { display: block; width: 3px; height: 9px; background: var(--signal-gold); border-radius: 99px; }
.signal-mark i:nth-child(2) { height: 21px; }
.signal-mark i:nth-child(3) { height: 15px; }
.signal-mark i:nth-child(4) { height: 6px; }
.logo-wave { display: flex; align-items: center; gap: 2px; height: 24px; }
.logo-wave i { display: block; width: 3px; height: 9px; background: var(--blue); border-radius: 9px; }
.logo-wave i:nth-child(2), .logo-wave i:nth-child(4) { height: 17px; }
.logo-wave i:nth-child(3) { height: 24px; }
.main-nav { display: flex; gap: 30px; color: var(--muted); font-size: 14px; }
.main-nav span { white-space: nowrap; }
.mobile-menu { display: none; font-size: 23px; }

.top-strip { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--line); background: #f1f2f4; box-shadow: 0 2px 8px rgba(16,24,40,.08); }
.top-strip-inner { display: flex; align-items: center; justify-content: flex-end; gap: 16px; min-height: 49px; padding-block: 7px; font-size: 13px; }
.top-strip strong { text-align: right; }
.red-button { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 9px 17px; color: white; background: var(--red); border: 0; border-radius: 6px; font-weight: 800; font-size: 12px; text-decoration: none; white-space: nowrap; cursor: pointer; }
.red-button:hover { background: var(--red-dark); }

.advertorial { padding: 22px 0 55px; }
.content-label { display: inline-flex; margin-bottom: 12px; padding: 6px 9px; color: #6f4d16; background: #fff4da; border: 1px solid #ead39d; border-radius: 4px; font-size: 11px; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.article-head h1 { margin: 0; font: 700 clamp(27px, 4vw, 38px)/1.18 Merriweather, Georgia, serif; letter-spacing: -.025em; }
.byline { display: flex; flex-wrap: wrap; gap: 8px 25px; margin-top: 12px; color: var(--muted); font-size: 13px; }
.byline-author { align-items: center; gap: 12px; margin-top: 18px; }
.byline-author > img { width: 52px; height: 52px; flex: 0 0 52px; object-fit: cover; object-position: center top; border: 1px solid #d0d5dd; border-radius: 50%; }
.byline-copy { display: grid; gap: 2px; }
.byline-copy strong { color: var(--ink); font-size: 15px; }
.byline-kicker { color: #667085; font-size: 10px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.byline-meta { display: flex; flex-wrap: wrap; gap: 5px 17px; margin-top: 4px; color: #667085; font-size: 12px; }
.hero-link { display: block; margin: 28px 0; }
.hero-link img { width: 100%; max-height: 430px; object-fit: cover; box-shadow: 0 1px 4px rgba(16,24,40,.14); }
.article-body { font: 18px/1.72 Merriweather, Georgia, serif; }
.article-body p { margin: 0 0 24px; }
.article-body h2 { margin: 42px 0 18px; font: 700 clamp(24px, 3vw, 31px)/1.28 Merriweather, Georgia, serif; }
.article-body h3 { margin: 35px 0 14px; font: 700 23px/1.3 Merriweather, Georgia, serif; }
.article-body strong { font-weight: 700; }
.article-body ul { margin: -4px 0 26px; padding-left: 28px; }
.article-body li { margin: 10px 0; }
.article-body sup a { color: var(--blue); text-decoration: none; }
.article-image-link { display: block; margin: 31px 0; text-decoration: none; }
.article-image { width: 100%; border-radius: 7px; box-shadow: 0 4px 18px rgba(16,24,40,.14); }
.mechanism-figure { display: grid; grid-template-columns: repeat(3, 1fr); margin: 31px 0; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; font-family: Inter, sans-serif; }
.mechanism-figure div { min-height: 145px; padding: 23px 16px; background: #f8fbfc; text-align: center; }
.mechanism-figure div + div { border-left: 1px solid var(--line); }
.mechanism-figure b { display: block; margin-bottom: 9px; color: var(--blue); font-size: 14px; text-transform: uppercase; letter-spacing: .06em; }
.mechanism-figure span { font-size: 14px; line-height: 1.45; }
.article-quote { margin: 30px 0; padding: 20px 23px; border-left: 5px solid var(--blue); background: #f4f9fb; font-style: italic; }
.article-callout { margin: 34px 0; padding: 25px; border: 1px solid #141414; background: #ffe2e6; font-family: Inter, sans-serif; text-align: center; }
.article-callout h3 { margin: 0 0 9px; font: 800 21px/1.35 Inter, sans-serif; }
.article-callout p { margin: 0 0 17px; font: 15px/1.55 Inter, sans-serif; }
.article-callout .red-button { min-height: 52px; padding-inline: 30px; font-size: 15px; }
.study-note { padding: 18px 20px; color: #344054; background: #f2f4f7; border-left: 4px solid #98a2b3; font: 14px/1.55 Inter, sans-serif; }
.article-deck { margin: 18px 0 0; color: #475467; font: 18px/1.55 Inter, sans-serif; }
.comparison-table { width: 100%; margin: 28px 0 34px; border-collapse: collapse; font: 14px/1.45 Inter, sans-serif; }
.comparison-table th, .comparison-table td { padding: 14px 13px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.comparison-table th { color: white; background: var(--signal-navy); font-size: 12px; letter-spacing: .03em; text-transform: uppercase; }
.comparison-table td:first-child { font-weight: 700; }
.profile-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 26px 0 34px; font-family: Inter, sans-serif; }
.profile-card { padding: 18px; background: #f7faf9; border: 1px solid #d9e8e4; border-radius: 6px; }
.profile-card b { display: block; margin-bottom: 7px; color: var(--signal-navy); font-size: 15px; }
.profile-card span { display: block; color: #475467; font-size: 13px; line-height: 1.5; }
.fact-box { margin: 30px 0; padding: 22px; background: var(--signal-mint); border-top: 4px solid #458b7c; font: 15px/1.6 Inter, sans-serif; }
.fact-box strong { display: block; margin-bottom: 6px; color: var(--signal-navy); }
.partner-disclosure { margin: 0 0 23px; padding: 13px 15px; color: #475467; background: #fbfbfa; border: 1px solid var(--line); font: 12px/1.55 Inter, sans-serif; }
.author-card { display: grid; grid-template-columns: 92px 1fr; gap: 20px; align-items: start; margin: 38px 0 34px; padding: 24px; background: #f4f9fb; border: 1px solid #d5e7ec; border-top: 4px solid var(--blue); }
.author-card > img { width: 92px; height: 92px; object-fit: cover; object-position: center top; border-radius: 50%; }
.author-card-label { color: #475467; font-size: 10px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.author-card h2 { margin: 3px 0 2px; font: 700 22px/1.25 Merriweather, Georgia, serif; }
.author-card .author-role { margin: 0 0 9px; color: var(--signal-navy); font-size: 13px; font-weight: 700; }
.author-card p { margin: 0 0 10px; color: #344054; font: 14px/1.55 Inter, sans-serif; }
.author-card a { color: var(--blue); font-size: 13px; font-weight: 800; text-decoration: none; }
.author-card a:hover { text-decoration: underline; }

.sources { margin: 34px 0; border: 1px solid var(--line); }
.sources summary { padding: 17px 22px; font-weight: 700; cursor: pointer; }
.sources div { padding: 0 22px 18px; color: var(--muted); font-size: 13px; line-height: 1.55; }
.sources ol { padding-left: 20px; }
.sources a { color: var(--blue); }
.comments { padding-top: 31px; border-top: 1px solid var(--line); }
.comments h2 { margin: 0 0 25px; font-size: 25px; }
.comment { display: grid; grid-template-columns: 42px 1fr; gap: 15px; margin: 0 0 24px; }
.avatar { display: grid; place-items: center; width: 42px; height: 42px; color: var(--blue); background: #dff3f8; border-radius: 50%; font-weight: 800; }
.comment-head { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 7px; }
.comment-head strong { display: block; font-size: 14px; }
.comment-head small { color: var(--muted); }
.comment-body { padding: 15px 17px; background: #f5f6f7; font-size: 15px; line-height: 1.55; }
.comment-body p { margin: 0; }
.comment-source { margin-top: 6px; color: var(--muted); font-size: 11px; }
.site-footer { padding: 28px 0 80px; color: var(--muted); border-top: 1px solid var(--line); font-size: 12px; }
.mobile-sticky { display: none; }

/* Quiz: deliberately plain, mobile-first and close to the source cadence. */
.quiz-page { min-height: 100vh; background: var(--quiz-bg); }
.quiz-header { background: white; }
.quiz-header .site-header-inner { height: 60px; }
.quiz-meta { color: var(--muted); font-size: 12px; }
.progress-track { height: 6px; background: #e8eaed; }
.progress-track span { display: block; width: 3.57%; height: 100%; background: var(--red); transition: width .28s ease; }
.quiz-main { width: min(100% - 28px, 690px); margin-inline: auto; padding: clamp(38px, 8vh, 72px) 0 70px; }
.quiz-card { animation: enter .23s ease both; }
.quiz-kicker { margin: 0 0 12px; color: var(--red); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.quiz-card h1 { margin: 0; font: 700 clamp(27px, 5vw, 38px)/1.22 Merriweather, Georgia, serif; letter-spacing: -.02em; }
.quiz-card > p:not(.quiz-kicker) { margin: 14px 0 0; color: var(--muted); font-size: 16px; line-height: 1.55; }
.answer-list { display: grid; gap: 11px; margin-top: 30px; }
.answer-list.image-grid { grid-template-columns: repeat(2, 1fr); }
.answer { display: flex; align-items: center; justify-content: space-between; gap: 15px; min-height: 62px; width: 100%; padding: 14px 17px; color: var(--ink); background: white; border: 1px solid #d8dce2; border-radius: 7px; text-align: left; cursor: pointer; transition: border-color .15s, box-shadow .15s, transform .15s; }
.answer:hover, .answer:focus-visible { border-color: var(--red); box-shadow: 0 3px 12px rgba(232,26,65,.11); outline: none; transform: translateY(-1px); }
.answer.is-selected { color: white; background: var(--red); border-color: var(--red); }
.answer-icon { display: grid; place-items: center; width: 35px; height: 35px; flex: 0 0 35px; color: var(--blue); background: #edf8fa; border-radius: 50%; font-size: 19px; }
.answer.is-selected .answer-icon { color: var(--red); background: white; }
.answer-check { color: var(--red); font-weight: 800; }
.answer.is-selected .answer-check { color: white; }
.continue { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; margin-top: 28px; padding: 12px 28px; color: white; background: var(--red); border: 0; border-radius: 7px; font-weight: 800; cursor: pointer; }
.continue[disabled] { cursor: not-allowed; opacity: .45; }
.information-card { text-align: center; }
.information-card h1, .information-card > p { margin-inline: auto; max-width: 650px; }
.info-icon { display: grid; place-items: center; width: 82px; height: 82px; margin: 0 auto 23px; color: var(--blue); background: #e7f4f7; border-radius: 50%; font-size: 34px; }
.analysis-box { margin: 25px auto 0; max-width: 520px; padding: 19px; background: white; border: 1px solid var(--line); border-radius: 8px; text-align: left; }
.analysis-box div { height: 9px; overflow: hidden; background: #e7e9ed; border-radius: 99px; }
.analysis-box div span { display: block; height: 100%; background: var(--red); border-radius: inherit; }
.analysis-box small { display: block; margin-top: 8px; color: var(--muted); }
.vote-scale { grid-template-columns: repeat(3, 1fr); }
.vote-scale .answer { min-height: 86px; justify-content: center; text-align: center; }
.quiz-note { margin-top: 17px !important; font-size: 12px !important; }
.loader-ring { width: 94px; height: 94px; margin: 0 auto 28px; border: 8px solid #e8eaed; border-top-color: var(--red); border-radius: 50%; animation: spin 1s linear infinite; }
.loader-message { min-height: 24px; color: var(--muted); font-weight: 600; }
.identity-form { display: grid; gap: 15px; margin-top: 27px; }
.identity-form label:not(.consent) { display: grid; gap: 7px; color: #344054; font-size: 13px; font-weight: 700; }
.identity-form input:not([type="checkbox"]) { min-height: 54px; padding: 0 14px; background: white; border: 1px solid #cfd4dc; border-radius: 7px; }
.identity-form input:focus { border-color: var(--red); outline: 3px solid rgba(232,26,65,.12); }
.consent { display: flex; gap: 10px; align-items: flex-start; color: var(--muted); font-size: 12px; line-height: 1.45; }
.identity-form .consent input[type="checkbox"] { flex: 0 0 16px; width: 16px; height: 16px; min-height: 0; margin: 1px 0 0; padding: 0; accent-color: var(--red); }
.result-wrap { width: min(100% - 28px, 880px); margin-inline: auto; padding: 42px 0 80px; }
.result-panel { padding: clamp(24px, 5vw, 43px); background: white; border: 1px solid var(--line); border-radius: 9px; box-shadow: 0 9px 30px rgba(16,24,40,.07); }
.result-panel h1 { margin: 0; font: 700 clamp(28px, 5vw, 42px)/1.2 Merriweather, Georgia, serif; }
.result-summary { color: var(--muted); font-size: 17px; line-height: 1.6; }
.prescription { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 26px 0 36px; }
.prescription div { padding: 16px; background: #f5f7f8; }
.prescription small { display: block; margin-bottom: 5px; color: var(--red); font-weight: 800; text-transform: uppercase; }
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.plan { position: relative; padding: 25px; border: 1px solid #d7dbe1; border-radius: 8px; }
.plan.featured { border: 2px solid var(--red); }
.plan-badge { display: inline-block; padding: 5px 8px; color: white; background: var(--red); border-radius: 4px; font-size: 10px; font-weight: 800; text-transform: uppercase; }
.plan h2 { margin: 15px 0 5px; font-size: 22px; }
.price { margin: 10px 0 16px; }
.price strong { font: 700 39px/1 Merriweather, Georgia, serif; }
.price span { color: var(--muted); font-size: 12px; }
.plan ul { min-height: 145px; padding-left: 21px; color: #344054; font-size: 14px; line-height: 1.55; }
.checkout-disabled { width: 100%; min-height: 50px; color: white; background: #8a8f98; border: 0; border-radius: 6px; font-weight: 800; cursor: not-allowed; }
.checkout-note { margin: 21px 0 0; padding: 14px; color: #76510b; background: #fff5d6; font-size: 12px; line-height: 1.45; }
.result-disclaimer { margin-top: 20px; color: var(--muted); font-size: 11px; }

@keyframes enter { from { opacity: 0; transform: translateY(7px); } to { opacity: 1; transform: none; } }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 700px) {
  .main-nav { display: none; }
  .mobile-menu { display: block; }
  .top-strip-inner { justify-content: space-between; }
  .top-strip strong { max-width: 220px; text-align: left; font-size: 11px; line-height: 1.25; }
  .article-head h1 { font-size: 26px; }
  .advertorial { padding-top: 14px; }
  .hero-link { margin: 16px -16px 22px; }
  .article-body { font-size: 17px; line-height: 1.66; }
  .author-card { grid-template-columns: 68px 1fr; gap: 14px; padding: 18px; }
  .author-card > img { width: 68px; height: 68px; }
  .mechanism-figure { grid-template-columns: 1fr; }
  .profile-grid { grid-template-columns: 1fr; }
  .comparison-table { display: block; overflow-x: auto; font-size: 12px; }
  .mechanism-figure div { min-height: 0; }
  .mechanism-figure div + div { border-top: 1px solid var(--line); border-left: 0; }
  .mobile-sticky { position: fixed; right: 10px; bottom: calc(10px + env(safe-area-inset-bottom)); left: 10px; z-index: 20; display: flex; justify-content: space-between; align-items: center; min-height: 53px; padding: 9px 15px; color: white; background: var(--red); border-radius: 6px; box-shadow: 0 8px 25px rgba(16,24,40,.25); text-decoration: none; font-weight: 800; }
  .mobile-sticky small { font-weight: 600; }
  .quiz-meta { display: none; }
  .quiz-main { padding-top: 34px; }
  .answer-list.image-grid, .vote-scale, .prescription, .plans { grid-template-columns: 1fr; }
  .vote-scale .answer { min-height: 61px; }
  .plan ul { min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}