/* ============================================
   BIOMETRICVIEW.COM — Security Research Publication
   D6 palette + typography (2026-05-21) — warm-dark, amber, IBM Plex Serif headings
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Serif:wght@500;600;700&family=Sora:wght@300;400;500;600&family=Space+Mono:wght@400;700&display=swap');

/* D3 artifacts — variable extensions (added 2026-05-20 for BDRI + matrix; D6 retones) */
:root {
  --color-accent-cyan: #5A9EA3;
  --color-accent-purple: #A78BFA;
  --color-accent-amber: #D4A24C;
  --color-text-on-dark: #D8D2C7;
  --color-border-soft: #2A2D38;
  --color-bg-warm: #1F2128;
  /* D6 fix 2026-05-21: matrix CSS used `var(--color-surface, #1E293B)` fallback (cool slate from old palette) — define it here so matrix surfaces use the warm D6 dark */
  --color-surface: #14171E;
  --color-surface-elevated: #1A1D26;
}

:root {
  /* D6 palette — warm dark publication, amber editorial accent */
  --color-bg: #0E1015;
  --color-bg-surface: #14171E;
  --color-bg-card: #1A1D26;
  --color-bg-hover: #20232C;
  --color-primary: #D4A24C;
  --color-primary-light: #E5B86A;
  --color-primary-dark: #B58736;
  --color-accent: #5A9EA3;
  --color-accent-dim: rgba(90,158,163,0.12);
  --color-text: #D8D2C7;
  --color-text-light: #948D80;
  --color-text-muted: #5C574E;
  --color-border: #20232C;
  --color-border-light: #2F3340;
  --color-white: #F5EFE2;
  --color-danger: #C84A4A;
  /* D6 typography — serif headings (IBM Plex Serif) + sans body (Sora) + mono datelines (Space Mono) */
  --font-display: 'IBM Plex Serif', 'Georgia', 'Times New Roman', serif;
  --font-body: 'Sora', 'Segoe UI', sans-serif;
  --font-mono: 'Space Mono', 'Courier New', monospace;
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(212,162,76,0.18);
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 12px;
  --max-width: 1200px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-body);background:var(--color-bg);color:var(--color-text);line-height:1.72;-webkit-font-smoothing:antialiased;min-height:100vh}
img{max-width:100%;height:auto;display:block}
a{color:var(--color-primary-light);text-decoration:none;transition:color 0.25s}
a:hover{color:var(--color-accent)}

/* Grid scanline overlay */
body::before{content:'';position:fixed;top:0;left:0;width:100%;height:100%;background:
  linear-gradient(rgba(212,162,76,0.02) 1px, transparent 1px),
  linear-gradient(90deg, rgba(212,162,76,0.02) 1px, transparent 1px);
  background-size:40px 40px;pointer-events:none;z-index:0}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(14,16,21,0.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--color-border)}
.header-inner{max-width:var(--max-width);margin:0 auto;padding:0 2rem;display:flex;align-items:center;justify-content:space-between;height:64px}
.site-logo{font-family:var(--font-mono);font-size:1.15rem;font-weight:700;color:var(--color-white);letter-spacing:-0.02em}
.site-logo span{color:var(--color-primary)}
.main-nav{display:flex;gap:0}
.main-nav a{font-family:var(--font-body);font-size:0.78rem;font-weight:500;color:var(--color-text-light);padding:0.4rem 0.7rem;border-radius:var(--radius-sm);transition:all 0.25s;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{color:var(--color-primary-light);background:rgba(212,162,76,0.08)}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;width:44px;height:44px;position:relative}
.menu-toggle span,.menu-toggle span::before,.menu-toggle span::after{display:block;width:20px;height:1.5px;background:var(--color-text);border-radius:2px;transition:all 0.3s;position:absolute;left:12px}
.menu-toggle span{top:21px}.menu-toggle span::before{content:'';top:-6px}.menu-toggle span::after{content:'';top:6px}
.mobile-nav{display:none;position:fixed;top:64px;left:0;right:0;bottom:0;background:rgba(14,16,21,0.97);backdrop-filter:blur(20px);padding:1.5rem;z-index:99;overflow-y:auto}
.mobile-nav.open{display:flex;flex-direction:column;gap:0.15rem}
.mobile-nav a{font-size:0.92rem;font-weight:500;color:var(--color-text-light);padding:0.75rem 1rem;border-radius:var(--radius-sm);border-bottom:1px solid var(--color-border)}
.mobile-nav a:hover{background:rgba(212,162,76,0.06);color:var(--color-primary-light)}

/* Hero */
.hero{position:relative;min-height:460px;display:flex;align-items:center;overflow:hidden;background:var(--color-bg)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0.3}
.hero::after{content:'';position:absolute;inset:0;background:linear-gradient(160deg,rgba(14,16,21,0.85) 0%,rgba(14,16,21,0.5) 50%,rgba(14,16,21,0.75) 100%)}
.hero-content{position:relative;z-index:2;max-width:var(--max-width);margin:0 auto;padding:4rem 2rem;width:100%}
.hero-badge{display:inline-block;font-family:var(--font-mono);font-size:0.65rem;font-weight:700;letter-spacing:0.14em;text-transform:uppercase;color:var(--color-accent);background:var(--color-accent-dim);border:1px solid rgba(90,158,163,0.25);padding:0.3rem 0.9rem;border-radius:100px;margin-bottom:1.2rem}
.hero h1{font-family:var(--font-display);font-size:clamp(2rem,4.5vw,3.2rem);font-weight:700;color:var(--color-white);line-height:1.15;max-width:620px;margin-bottom:1rem;letter-spacing:-0.02em}
.hero p{font-size:1rem;color:var(--color-text-light);max-width:500px;line-height:1.7;margin-bottom:1.75rem}
.hero-cta{display:inline-flex;align-items:center;gap:0.5rem;font-family:var(--font-body);font-size:0.82rem;font-weight:600;color:var(--color-bg);background:var(--color-primary);padding:0.75rem 1.5rem;border-radius:var(--radius-sm);transition:all 0.3s}
.hero-cta:hover{background:var(--color-accent);color:var(--color-bg);transform:translateY(-1px);box-shadow:var(--shadow-glow)}
.hero-cta svg{width:15px;height:15px}

/* Breadcrumb */
.breadcrumb{max-width:var(--max-width);margin:0 auto;padding:1.2rem 2rem 0;font-size:0.75rem;color:var(--color-text-muted)}
.breadcrumb a{color:var(--color-text-light);text-decoration:underline;text-decoration-color:rgba(148,163,184,0.5);text-underline-offset:2px}.breadcrumb a:hover{color:var(--color-primary);text-decoration-color:currentColor}.breadcrumb span{margin:0 0.4rem}
/* A11y: footer-bottom links underlined so they distinguish from surrounding muted text without relying on color alone (WCAG 1.4.1) */
.footer-bottom a{text-decoration:underline;text-decoration-color:rgba(96,165,250,0.4);text-underline-offset:2px}
.footer-bottom a:hover{text-decoration-color:currentColor}

/* Layout */
.page-layout{max-width:var(--max-width);margin:0 auto;padding:2.5rem 2rem 4rem;display:grid;grid-template-columns:1fr 280px;gap:2.5rem;position:relative;z-index:1}

/* Article */
.article-content{min-width:0}
.article-content h2{font-family:var(--font-display);font-size:1.65rem;font-weight:700;color:var(--color-white);margin:2.5rem 0 0.85rem;line-height:1.25}
.article-content h2:first-child{margin-top:0}
.article-content h3{font-family:var(--font-display);font-size:1.2rem;font-weight:600;color:var(--color-white);margin:1.8rem 0 0.6rem}
.article-content h4{font-family:var(--font-display);font-size:1.05rem;font-weight:600;color:var(--color-white);margin:1.4rem 0 0.5rem}
.article-content p{margin-bottom:1.15rem;color:var(--color-text);font-size:0.95rem}
.article-content strong{font-weight:600;color:var(--color-white)}
.article-content ul,.article-content ol{margin:0 0 1rem 1.5rem;font-size:.95rem;color:var(--color-text)}.article-content li{margin-bottom:.4rem;line-height:1.6}
.article-content table{width:100%;border-collapse:collapse;margin:1.5rem 0;font-size:.9rem;border-radius:8px;overflow:hidden;box-shadow:var(--shadow)}
.article-content thead{background:var(--color-bg-card);color:var(--color-white);border-bottom:2px solid var(--color-primary)}
.article-content th{padding:.7rem .9rem;text-align:left;font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.03em}
.article-content td{padding:.65rem .9rem;border-bottom:1px solid var(--color-border);color:var(--color-text)}
.article-content tbody tr:nth-child(even){background:rgba(255,255,255,.03)}
.article-content tbody tr:hover{background:rgba(255,255,255,.06)}

.content-image{margin:2rem 0;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--color-border)}
.content-image img{width:100%;height:280px;object-fit:cover}
.content-image figcaption{padding:0.6rem 1rem;background:var(--color-bg-surface);font-size:0.75rem;color:var(--color-text-light);text-align:center}

.highlight-box{background:rgba(212,162,76,0.06);border-left:3px solid var(--color-primary);padding:1.3rem 1.5rem;border-radius:0 var(--radius-md) var(--radius-md) 0;margin:2rem 0}
.highlight-box p{margin-bottom:0.45rem;font-size:0.92rem}.highlight-box p:last-child{margin-bottom:0}

.benefits-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1rem;margin:2rem 0}
.benefit-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.3rem;transition:all 0.3s}
.benefit-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-glow);transform:translateY(-2px)}
.benefit-icon{width:40px;height:40px;border-radius:var(--radius-sm);background:rgba(212,162,76,0.1);display:flex;align-items:center;justify-content:center;margin-bottom:0.8rem;font-size:1.15rem}
.benefit-card h4{font-size:1rem;font-weight:600;margin-bottom:0.4rem;color:var(--color-white)}
.benefit-card p{font-size:0.85rem;color:var(--color-text-light);line-height:1.6;margin-bottom:0}

/* Sidebar */
.sidebar{display:flex;flex-direction:column;gap:1.5rem}
.sidebar-widget{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.3rem}
.sidebar-widget h3,.sidebar-widget h2.sidebar-widget-heading{font-family:var(--font-display);font-size:1rem;font-weight:700;margin-bottom:0.85rem;padding-bottom:0.6rem;border-bottom:2px solid var(--color-primary);color:var(--color-white);margin-top:0}
.sidebar-nav a{display:block;font-size:0.82rem;color:var(--color-text-light);padding:0.5rem 0;border-bottom:1px solid var(--color-border);transition:all 0.2s}
.sidebar-nav a:last-child{border-bottom:none}
.sidebar-nav a:hover{color:var(--color-primary-light);padding-left:0.5rem}
.sidebar-nav a.active{color:var(--color-primary);font-weight:600}

.ad-space{background:var(--color-bg-surface);border:2px dashed var(--color-border-light);border-radius:var(--radius-md);padding:2.5rem 1.5rem;text-align:center;font-size:0.75rem;color:var(--color-text-muted);min-height:250px;display:flex;align-items:center;justify-content:center}
.ad-space-inline{margin:2.5rem 0;background:var(--color-bg-surface);border:2px dashed var(--color-border-light);border-radius:var(--radius-md);padding:1.5rem;text-align:center;font-size:0.75rem;color:var(--color-text-muted);min-height:90px;display:flex;align-items:center;justify-content:center}

/* Cards */
.section-cards{max-width:var(--max-width);margin:0 auto;padding:3rem 2rem 4rem;position:relative;z-index:1}
.section-heading{text-align:center;margin-bottom:2.5rem}
.section-heading h2{font-size:1.85rem;font-weight:700;color:var(--color-white);margin-bottom:0.5rem}
.section-heading p{font-size:0.95rem;color:var(--color-text-light);max-width:520px;margin:0 auto}
.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:1.25rem}
.topic-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden;transition:all 0.35s;text-decoration:none;display:block}
.topic-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-glow);transform:translateY(-3px)}
.topic-card-img{width:100%;height:180px;object-fit:cover;opacity:0.8}
.topic-card-body{padding:1.25rem}
.topic-card-body h3{font-size:1.05rem;font-weight:600;color:var(--color-white);margin-bottom:0.35rem}
.topic-card-body p{font-size:0.83rem;color:var(--color-text-light);line-height:1.6;margin-bottom:0.8rem}
.card-link{font-size:0.75rem;font-weight:600;color:var(--color-primary);letter-spacing:0.02em;display:inline-flex;align-items:center;gap:0.3rem}
.card-link::after{content:'→';transition:transform 0.2s}
.topic-card:hover .card-link::after{transform:translateX(4px)}

/* TOC */
.toc{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.3rem 1.5rem;margin-bottom:2rem}
.toc h3{font-family:var(--font-mono);font-size:0.72rem;font-weight:700;text-transform:uppercase;letter-spacing:0.1em;color:var(--color-text-muted);margin-bottom:0.7rem}
.toc ol{list-style:decimal;padding-left:1.2rem}
.toc li{font-size:0.85rem;padding:0.2rem 0}
.toc a{color:var(--color-text-light)}.toc a:hover{color:var(--color-primary)}

/* FAQ */
.faq-section{margin:2.5rem 0}
.faq-item{border-bottom:1px solid var(--color-border);padding:1.1rem 0}
.faq-item h3{font-size:1.05rem;font-weight:600;color:var(--color-white);margin-bottom:0.45rem}
.faq-item p{color:var(--color-text-light);font-size:0.9rem}

/* Author Byline */
.author-byline{font-size:.85rem;color:var(--color-text-muted);margin-top:.5rem;padding-bottom:.75rem;border-bottom:1px solid var(--color-border)}
.author-byline a{color:var(--color-text-light)}
.author-byline a:hover{color:var(--color-primary-light)}

/* Last Reviewed */
.last-reviewed{font-size:.8rem;color:var(--color-text-muted);margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--color-border)}

/* Related Articles */
.related-articles{margin-top:2rem;padding:1.25rem;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-md)}
.related-articles h3{font-size:1rem;margin-bottom:.75rem;color:var(--color-white)}
.related-articles a{display:block;padding:8px 0;border-bottom:1px solid var(--color-border);text-decoration:none;color:var(--color-text-light);transition:color 0.2s}
.related-articles a:last-child{border-bottom:none}
.related-articles a:hover{color:var(--color-primary-light)}

/* Footer */
.site-footer{background:var(--color-bg-surface);border-top:1px solid var(--color-border);position:relative;z-index:1}
.footer-inner{max-width:var(--max-width);margin:0 auto;padding:3rem 2rem 1.5rem;display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2.5rem}
.footer-brand .site-logo{margin-bottom:0.9rem;display:inline-block}
.footer-brand p{font-size:0.85rem;color:var(--color-text-light);line-height:1.65;max-width:300px}
.footer-col h3,.footer-col h4{font-family:var(--font-mono);font-size:0.68rem;font-weight:700;text-transform:uppercase;letter-spacing:0.1em;color:var(--color-text-light);margin-bottom:1rem}
.footer-col a{display:block;font-size:0.82rem;color:var(--color-text-light);padding:0.28rem 0;transition:color 0.2s}
.footer-col a:hover{color:var(--color-primary-light)}
.footer-bottom{max-width:var(--max-width);margin:0 auto;padding:1.2rem 2rem;border-top:1px solid var(--color-border);font-size:0.7rem;color:var(--color-text-light);display:flex;justify-content:space-between}

/* Responsive */
@media(max-width:960px){.main-nav{display:none}.menu-toggle{display:block}.page-layout{grid-template-columns:1fr}.footer-inner{grid-template-columns:1fr;gap:1.5rem}.footer-bottom{flex-direction:column;gap:0.4rem}}
@media(max-width:640px){.hero{min-height:380px}.hero-content{padding:2.5rem 1.25rem}.header-inner{padding:0 1.25rem}.page-layout{padding:1.5rem 1.25rem 3rem}.section-cards{padding:2rem 1.25rem 3rem}.cards-grid{grid-template-columns:1fr}.benefits-grid{grid-template-columns:1fr}.content-image img{height:200px}.article-content table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}}

@keyframes fadeInUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}


.skip-to:focus{position:fixed!important;left:16px;top:16px;opacity:1!important;pointer-events:auto!important;z-index:9999;background:var(--color-primary);color:#fff;border-radius:6px;padding:8px 16px;outline:2px solid var(--color-primary);font-size:14px;text-decoration:none}

a:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:2px}
button:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}
.article-toc{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:8px;padding:1.25rem 1.5rem;margin:1.5rem 0}
.article-toc h3{font-size:.95rem;font-weight:700;color:var(--color-text);margin-bottom:.6rem;text-transform:uppercase;letter-spacing:.03em}
.article-toc ol{margin:0 0 0 1.2rem;font-size:.9rem;color:var(--color-text-light)}
.article-toc li{margin-bottom:.3rem;line-height:1.5}
.article-toc a{color:var(--color-primary);text-decoration:none}
.article-toc a:hover{text-decoration:underline}
.author-bio-box{display:flex;gap:1.25rem;align-items:flex-start;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:10px;padding:1.25rem 1.5rem;margin:2rem 0}
.author-bio-box .author-info h3{font-size:.95rem;font-weight:700;color:var(--color-text);margin-bottom:.25rem}
.author-bio-box .author-info p{font-size:.85rem;color:var(--color-text-light);line-height:1.5;margin:0}
.author-bio-box .author-info a{color:var(--color-primary);font-size:.85rem}
@media(max-width:600px){.author-bio-box{flex-direction:column;align-items:center;text-align:center}}
@media print {
  .site-header, .mobile-nav, .menu-toggle, .sidebar, .site-footer, .hero-cta, .hero-badge { display: none !important; }
  .hero { min-height: auto !important; padding: 20px 0; }
  .hero-bg { display: none; }
  .hero-content { position: static; color: #000; text-shadow: none; }
  .page-layout { display: block; }
  .article-content { max-width: 100%; }
  body { font-size: 12pt; line-height: 1.5; color: #000; background: #fff; }
  a { color: #000; text-decoration: underline; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 9pt; }
  .comparison-table { font-size: 9pt; }
  .benefits-grid { display: block; }
  .benefit-card { border: 1px solid #ccc; margin-bottom: 8px; page-break-inside: avoid; }
  .highlight-box { border: 1px solid #999; background: #f5f5f5 !important; }
  img { max-width: 100%; }
  .related-articles { page-break-before: always; }
}/* ===== BDRI Wizard styles (Phase 2.1) ===== */
.bdri-app { max-width: 720px; margin: 2rem auto; }
.bdri-loading { color: var(--color-text-muted, #64748B); }
.bdri-intro { font-size: 1.05rem; line-height: 1.6; }
.disclaimer-tier1 { font-size: 0.9rem; color: var(--color-text-muted, #64748B); border-left: 3px solid var(--color-accent-amber, #FBBF24); padding-left: 1rem; margin: 1.5rem 0; }
.disclaimer-tier1-footer { font-size: 0.85rem; color: var(--color-text-muted, #64748B); margin-top: 2rem; text-align: center; }
.disclaimer-tier2 { background: rgba(251, 191, 36, 0.08); border: 1px solid var(--color-accent-amber, #FBBF24); border-radius: 6px; padding: 1rem; margin: 1rem 0; font-size: 0.9rem; }
.noscript-block { background: rgba(248, 113, 113, 0.1); border: 1px solid #F87171; padding: 1rem; border-radius: 6px; margin: 1rem 0; }
.bdri-progress { margin-bottom: 1.5rem; }
.bdri-progress-bar { height: 6px; background: var(--color-accent-cyan, #60A5FA); border-radius: 3px; transition: width 0.2s ease; }
@media (prefers-reduced-motion: reduce) {
  .bdri-progress-bar { transition: none; }
}
.bdri-progress-label { font-size: 0.85rem; color: var(--color-text-muted, #64748B); margin-top: 0.5rem; }
.bdri-module-framing { font-size: 0.95rem; color: var(--color-text-muted, #64748B); margin-bottom: 1.5rem; }
.bdri-prompt { font-size: 1.3rem; line-height: 1.4; margin: 1rem 0 0.5rem; }
.bdri-prompt:focus { outline: 2px solid var(--color-accent-cyan, #60A5FA); outline-offset: 4px; }
.bdri-subdim-label { font-size: 0.85rem; color: var(--color-text-muted, #64748B); margin-bottom: 1rem; }
.bdri-options { border: 0; padding: 0; margin: 0; }
.bdri-option { display: block; padding: 0.75rem 1rem; margin-bottom: 0.5rem; border: 1px solid var(--color-border-soft, #2a3046); border-radius: 6px; cursor: pointer; transition: background-color 0.15s ease; }
@media (prefers-reduced-motion: reduce) {
  .bdri-option { transition: none; }
}
.bdri-option:hover { background-color: rgba(96, 165, 250, 0.08); }
.bdri-option input { margin-right: 0.75rem; }
.bdri-option input:focus { outline: 2px solid var(--color-accent-cyan, #60A5FA); outline-offset: 2px; }
.bdri-nav { display: flex; gap: 1rem; margin-top: 2rem; }
.bdri-back, .bdri-next { padding: 0.75rem 1.5rem; border-radius: 6px; border: 0; cursor: pointer; font-size: 1rem; }
.bdri-back { background: var(--color-bg-warm, #1E2940); color: var(--color-text-on-dark, #CBD5E1); }
.bdri-back[disabled] { opacity: 0.4; cursor: not-allowed; }
/* Note: --color-bg-card (#181C28) used instead of --color-primary-dark (which is #2563EB on this site) for dark-navy text/bg */
.bdri-next { background: var(--color-accent-cyan, #60A5FA); color: var(--color-bg-card, #181C28); font-weight: 600; }
.bdri-resume-banner { background: rgba(96, 165, 250, 0.08); border: 1px solid var(--color-accent-cyan, #60A5FA); padding: 1rem; border-radius: 6px; margin: 1rem 0; }
.bdri-resume-banner button { margin-right: 0.5rem; padding: 0.5rem 1rem; border-radius: 6px; border: 0; cursor: pointer; }
.bdri-resume { background: var(--color-accent-cyan, #60A5FA); color: var(--color-bg-card, #181C28); }
.bdri-startfresh { background: transparent; color: var(--color-text-light); border: 1px solid var(--color-border-light); }
@media (max-width: 768px) {
  .bdri-app { padding: 0 1rem; max-width: 100%; }
  .bdri-intro { font-size: 1rem; }
  .bdri-prompt { font-size: 1.1rem; }
  .bdri-module-framing { font-size: 0.875rem; }

  /* Larger tap targets on radios + options (Apple HIG / Material: ≥44px) */
  .bdri-option {
    min-height: 44px;
    padding: 0.875rem 1rem;
    display: flex;
    align-items: center;
  }
  .bdri-option input {
    width: 20px;
    height: 20px;
    margin-right: 0.875rem;
    flex-shrink: 0;
  }

  /* Sticky bottom nav pair with visual separation */
  .bdri-nav {
    position: sticky;
    bottom: 0;
    background: var(--color-bg-card, #181C28);
    padding: 0.875rem 0;
    margin-top: 1.5rem;
    border-top: 1px solid var(--color-border-soft, #2a3046);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.25);
    z-index: 10;
  }
  .bdri-back, .bdri-next {
    flex: 1;
    min-height: 44px;
    font-size: 1rem;
  }

  /* Resume banner buttons full-width-ish on mobile for easier tap */
  .bdri-resume-banner button {
    min-height: 44px;
    padding: 0.625rem 1rem;
  }

  /* Disclaimer text slightly smaller to save vertical space */
  .disclaimer-tier1, .disclaimer-tier1-footer { font-size: 0.8125rem; }
  .disclaimer-tier2 { font-size: 0.85rem; padding: 0.875rem; }
}

/* Screen-reader-only utility (used by .bdri-options legend) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Tools nav dropdown (Phase 2.7) ===== */
.nav-dropdown {
  position: relative;
  display: inline-block;
}
.nav-dropdown-trigger {
  display: inline-block;
}
.nav-dropdown-chevron {
  display: inline-block;
  font-size: 0.7em;
  margin-left: 0.2em;
  transform: translateY(-1px);
  transition: transform 0.15s ease;
}
.nav-dropdown:hover .nav-dropdown-chevron,
.nav-dropdown:focus-within .nav-dropdown-chevron {
  transform: rotate(180deg) translateY(1px);
}
@media (prefers-reduced-motion: reduce) {
  .nav-dropdown-chevron { transition: none; }
}
.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  display: none;
  background: var(--color-bg-surface, #12151E);
  border: 1px solid var(--color-border-soft, #2a3046);
  border-radius: 6px;
  min-width: 180px;
  padding: 0.5rem 0;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  display: block;
}
.nav-dropdown-menu a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--color-text, #CBD5E1);
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
}
.nav-dropdown-menu a:hover,
.nav-dropdown-menu a:focus {
  background: var(--color-bg-hover, #1E2233);
  color: var(--color-accent-cyan, #60A5FA);
  outline: none;
}
@media (max-width: 768px) {
  /* Mobile uses the flat mobileNav nav — hide desktop dropdown menu */
  .nav-dropdown-menu { display: none !important; }
  /* Hide chevron on mobile since mobileNav handles tool list */
  .nav-dropdown-chevron { display: none; }
}

/* ===== BDRI Scorecard / Report (Phase 3.1) ===== */
.bdri-report { margin-top: 1.5rem; }
.bdri-scorecard {
  background: var(--color-bg-card, #181C28);
  border: 1px solid var(--color-border-soft, #2a3046);
  border-radius: 12px;
  padding: 2rem;
  margin: 2rem 0;
}
.bdri-scorecard-composite { font-size: 0; line-height: 1; }
.bdri-composite-value {
  font-size: 4.5rem;
  font-weight: 800;
  color: var(--color-text-on-dark, #CBD5E1);
  line-height: 1;
}
.bdri-composite-max {
  font-size: 1.5rem;
  color: var(--color-text-muted, #64748B);
  margin-left: 0.5rem;
}
.bdri-scorecard-tier {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 0.5rem;
  color: var(--color-accent-cyan, #60A5FA);
}
.bdri-scorecard-interp {
  font-size: 1rem;
  color: var(--color-text-on-dark, #CBD5E1);
  margin: 0.75rem 0 1.5rem;
  line-height: 1.5;
}
.bdri-scorebar-row {
  display: grid;
  grid-template-columns: 1fr 3fr auto;
  gap: 1rem;
  align-items: center;
  margin-bottom: 0.75rem;
}
.bdri-scorebar-label {
  font-size: 0.95rem;
  color: var(--color-text-on-dark, #CBD5E1);
  font-weight: 600;
}
.bdri-scorebar-track {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  height: 12px;
  overflow: hidden;
}
.bdri-scorebar-fill {
  height: 100%;
  transition: width 0.4s ease;
}
@media (prefers-reduced-motion: reduce) {
  .bdri-scorebar-fill { transition: none; }
}
.bdri-scorebar-value {
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--color-text-muted, #64748B);
}
.disclaimer-tier3 {
  font-size: 0.85rem;
  color: var(--color-text-muted, #64748B);
  border-top: 1px solid var(--color-border-soft, #2a3046);
  padding-top: 1.5rem;
  margin-top: 2rem;
  line-height: 1.6;
}

/* ===== BDRI Payload-load-error notice (Phase 5 / gate C corrupt-URL path) ===== */
.bdri-load-error {
  background: rgba(239, 68, 68, 0.08);
  border-left: 3px solid var(--color-danger, #EF4444);
  padding: 0.85rem 1.1rem;
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text, #CBD5E1);
  border-radius: 0 6px 6px 0;
  line-height: 1.5;
}

/* ===== BDRI Recomputed-version notice (Phase 5 / gate C) ===== */
.bdri-recomputed-notice {
  background: rgba(96, 165, 250, 0.08);
  border-left: 3px solid var(--color-accent-cyan, #60A5FA);
  padding: 0.85rem 1.1rem;
  margin: 0 0 1.5rem;
  font-size: 0.88rem;
  color: var(--color-text, #CBD5E1);
  border-radius: 0 6px 6px 0;
  line-height: 1.5;
}
.bdri-recomputed-notice strong {
  color: var(--color-accent-cyan, #60A5FA);
  display: block;
  margin-bottom: 0.25rem;
}

/* ===== BDRI Misalignment Callout (Phase 3.2) ===== */
.bdri-misalignment-callout {
  display: flex;
  gap: 1rem;
  background: rgba(251, 191, 36, 0.08);
  border-left: 4px solid var(--color-accent-amber, #FBBF24);
  border-radius: 0 8px 8px 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.bdri-misalignment-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent-amber, #FBBF24);
  color: var(--color-bg-card, #181C28);
  font-weight: 800;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.bdri-misalignment-body { flex: 1; }
.bdri-misalignment-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent-amber, #FBBF24);
  margin: 0 0 0.5rem;
}
.bdri-misalignment-body p {
  font-size: 0.95rem;
  color: var(--color-text-on-dark, #CBD5E1);
  margin: 0.5rem 0;
  line-height: 1.5;
}
.bdri-misalignment-why {
  font-size: 0.9rem !important;
  color: var(--color-text-muted, #64748B) !important;
}

/* ===== BDRI Per-Pillar Accordions (Phase 3.3) ===== */
.bdri-pillar-accordions { margin: 1.5rem 0; }
.bdri-pillar-accordion {
  background: var(--color-bg-surface, #12151E);
  border: 1px solid var(--color-border-soft, #2a3046);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
}
.bdri-pillar-summary {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  user-select: none;
}
.bdri-pillar-summary::-webkit-details-marker { display: none; }
.bdri-pillar-summary::before {
  content: '▸';
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--color-text-muted, #64748B);
  transition: transform 0.2s ease;
}
.bdri-pillar-accordion[open] .bdri-pillar-summary::before {
  transform: rotate(90deg);
}
@media (prefers-reduced-motion: reduce) {
  .bdri-pillar-summary::before { transition: none; }
}
.bdri-pillar-color-swatch {
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.bdri-pillar-name {
  flex: 1;
  font-weight: 600;
  color: var(--color-text-on-dark, #CBD5E1);
}
.bdri-pillar-pct {
  font-family: monospace;
  font-size: 0.875rem;
  color: var(--color-text-muted, #64748B);
}
.bdri-pillar-body {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid var(--color-border-soft, #2a3046);
}
.bdri-pillar-body h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-on-dark, #CBD5E1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 1.5rem 0 0.5rem;
}
.bdri-pillar-body h4:first-of-type { margin-top: 1rem; }
.bdri-subdim-list { list-style: none; padding: 0; margin: 0; }
.bdri-subdim-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.9rem;
}
.bdri-subdim-row:last-child { border-bottom: 0; }
.bdri-subdim-name {
  color: var(--color-text-on-dark, #CBD5E1);
}
.bdri-subdim-score {
  font-family: monospace;
  color: var(--color-text-muted, #64748B);
  font-size: 0.85rem;
}
.bdri-subdim-pct {
  display: inline-block;
  margin-left: 0.25rem;
  color: var(--color-text-muted, #64748B);
}
.bdri-estimated-inline {
  display: inline-block;
  font-family: monospace;
  color: var(--color-accent-amber, #FBBF24);
  font-weight: 700;
  margin-left: 0.25rem;
  cursor: help;
}
.bdri-estimated-badge {
  background: rgba(251, 191, 36, 0.08);
  border-left: 3px solid var(--color-accent-amber, #FBBF24);
  border-radius: 0 6px 6px 0;
  padding: 0.875rem 1rem;
  margin: 1rem 0;
  font-size: 0.875rem;
  color: var(--color-text-on-dark, #CBD5E1);
  line-height: 1.5;
}
.bdri-estimated-badge ul { margin: 0.5rem 0 0.25rem 1.25rem; padding: 0; }
.bdri-estimated-badge li { margin-bottom: 0.25rem; }
.bdri-pillar-gaps, .bdri-pillar-actions, .bdri-pillar-citations {
  margin-top: 1rem;
}
.bdri-pillar-gaps ul, .bdri-pillar-actions ul, .bdri-pillar-citations ul {
  margin: 0.5rem 0 0 1.25rem;
  padding: 0;
}
.bdri-pillar-gaps li, .bdri-pillar-actions li, .bdri-pillar-citations li {
  font-size: 0.9rem;
  color: var(--color-text-on-dark, #CBD5E1);
  margin-bottom: 0.4rem;
  line-height: 1.5;
}
.bdri-pillar-actions a, .bdri-pillar-citations a {
  color: var(--color-accent-cyan, #60A5FA);
  text-decoration: none;
}
.bdri-pillar-actions a:hover, .bdri-pillar-citations a:hover {
  text-decoration: underline;
}

/* ===== BDRI Back-to-article link (Phase 3.4) ===== */
.bdri-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-accent-cyan, #60A5FA);
  text-decoration: none;
  margin-bottom: 1rem;
  padding: 0.375rem 0.75rem 0.375rem 0;
  border-radius: 4px;
  transition: color 0.15s ease;
}
.bdri-back-link:hover {
  color: var(--color-accent, #06D6A0);
  text-decoration: underline;
}
@media (prefers-reduced-motion: reduce) {
  .bdri-back-link { transition: none; }
}

/* ===== BDRI End-of-wizard CTAs (Phase 3.6) ===== */
.bdri-cta-cluster {
  margin: 2rem 0 1.5rem;
  padding: 1.5rem;
  background: var(--color-bg-surface, #12151E);
  border: 1px solid var(--color-border-soft, #2a3046);
  border-radius: 8px;
}
.bdri-cta-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-on-dark, #CBD5E1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 1rem;
}
.bdri-cta-primary {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  background: var(--color-accent-cyan, #60A5FA);
  color: var(--color-bg-card, #181C28);
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  margin-bottom: 1rem;
  transition: filter 0.15s ease;
}
.bdri-cta-primary:hover {
  filter: brightness(1.1);
  color: var(--color-bg-card, #181C28);
}
@media (prefers-reduced-motion: reduce) {
  .bdri-cta-primary { transition: none; }
}
.bdri-cta-secondary-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.875rem;
}
.bdri-cta-secondary {
  padding: 0.5rem 0.875rem;
  background: transparent;
  color: var(--color-text-on-dark, #CBD5E1);
  border: 1px solid var(--color-border-soft, #2a3046);
  border-radius: 6px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background 0.15s ease;
}
.bdri-cta-secondary:hover {
  background: var(--color-bg-hover, #1E2233);
  color: var(--color-accent-cyan, #60A5FA);
}
.bdri-cta-secondary:focus-visible {
  outline: 2px solid var(--color-accent-cyan, #60A5FA);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  .bdri-cta-secondary { transition: none; }
}
.bdri-cta-share-note {
  font-size: 0.75rem;
  color: var(--color-text-muted, #64748B);
  margin: 0;
  word-break: break-all;
}
.bdri-cta-share-note code {
  background: var(--color-bg-card, #181C28);
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
  font-family: monospace;
  color: var(--color-text-light, #94A3B8);
}

/* ===== BDRI Mobile Report Layout (Phase 3.8) — gate I (mobile subset) ===== */
@media (max-width: 768px) {
  .bdri-back-link {
    font-size: 0.8125rem;
    margin-bottom: 0.75rem;
  }

  /* Scorecard tighter on mobile */
  .bdri-scorecard {
    padding: 1.25rem;
    border-radius: 10px;
  }
  .bdri-composite-value {
    font-size: 3rem;
  }
  .bdri-composite-max {
    font-size: 1.125rem;
  }
  .bdri-scorecard-tier {
    font-size: 1.2rem;
  }
  .bdri-scorecard-interp {
    font-size: 0.9375rem;
  }

  /* Score bars: stack label / track / value vertically */
  .bdri-scorebar-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
    margin-bottom: 1.25rem;
  }
  .bdri-scorebar-label {
    font-size: 0.9rem;
  }
  .bdri-scorebar-value {
    font-size: 0.8125rem;
  }

  /* Misalignment callout: stack icon above body */
  .bdri-misalignment-callout {
    flex-direction: row;
    gap: 0.875rem;
    padding: 1rem 1.125rem;
  }
  .bdri-misalignment-icon {
    width: 28px;
    height: 28px;
    font-size: 1.1rem;
  }
  .bdri-misalignment-heading {
    font-size: 1rem;
  }
  .bdri-misalignment-body p {
    font-size: 0.875rem;
  }
  .bdri-misalignment-why {
    font-size: 0.8125rem !important;
  }

  /* Pillar accordions: reduce padding */
  .bdri-pillar-summary {
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
    gap: 0.625rem;
  }
  .bdri-pillar-body {
    padding: 0 1rem 1rem;
  }
  .bdri-pillar-body h4 {
    font-size: 0.8125rem;
    margin: 1.125rem 0 0.4rem;
  }
  .bdri-subdim-row {
    flex-wrap: wrap;
    gap: 0.25rem;
    font-size: 0.85rem;
  }
  .bdri-subdim-score {
    font-size: 0.8125rem;
  }
  .bdri-estimated-badge {
    font-size: 0.8125rem;
    padding: 0.75rem 0.875rem;
  }

  /* CTA cluster: stack vertically with full-width buttons */
  .bdri-cta-cluster {
    padding: 1.125rem;
  }
  .bdri-cta-heading {
    font-size: 0.875rem;
  }
  .bdri-cta-primary {
    display: block;
    text-align: center;
    padding: 0.75rem 1rem;
    min-height: 44px; /* tap target */
  }
  .bdri-cta-secondary-row {
    flex-direction: column;
    gap: 0.5rem;
  }
  .bdri-cta-secondary {
    width: 100%;
    padding: 0.75rem 1rem;
    min-height: 44px; /* tap target */
    font-size: 0.9rem;
  }
  .bdri-cta-share-note {
    font-size: 0.6875rem;
  }
  .bdri-cta-share-note code {
    font-size: 0.6875rem;
  }

  /* Tier-3 disclaimer tighter on mobile */
  .disclaimer-tier3 {
    font-size: 0.8125rem;
    padding-top: 1.25rem;
    margin-top: 1.5rem;
  }
}

/* ===== BDRI Print Stylesheet (Phase 3.7) — gate N ===== */
@media print {
  /* Reset page colors for ink */
  body, html {
    background: #ffffff !important;
    color: #000000 !important;
  }
  /* Hide everything outside the report */
  .site-header,
  .menu-toggle,
  .mobile-nav,
  .nav-dropdown,
  .hero,
  .breadcrumb,
  .sidebar,
  .site-footer,
  /* AdSense surfaces */
  ins.adsbygoogle,
  iframe[id*="google_ads"],
  iframe[id*="aswift"],
  /* Wizard intro elements (only the report should print) */
  .byline,
  .bdri-intro,
  .disclaimer-tier1,
  .disclaimer-tier1-footer,
  noscript,
  /* Wizard navigation buttons (in case wizard is mid-state when printing) */
  .bdri-loading,
  .bdri-resume-banner,
  .bdri-progress,
  .bdri-question,
  .bdri-nav,
  /* Back-link + CTA cluster on the report */
  .bdri-back-link,
  .bdri-cta-cluster {
    display: none !important;
  }
  /* Layout reset for print */
  .page-layout {
    display: block !important;
  }
  .article-content {
    max-width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
  }
  .bdri-report {
    margin: 0 !important;
  }
  /* Report container — bright background for ink readability */
  .bdri-scorecard {
    background: #ffffff !important;
    border: 2px solid #000000 !important;
    color: #000000 !important;
    padding: 1.5rem !important;
    page-break-inside: avoid;
  }
  .bdri-composite-value,
  .bdri-scorecard-interp,
  .bdri-scorebar-label {
    color: #000000 !important;
  }
  .bdri-composite-max,
  .bdri-scorebar-value {
    color: #444444 !important;
  }
  .bdri-scorecard-tier {
    color: #0F4C81 !important; /* darker cyan for print contrast */
  }
  /* Bar fills keep brand colors; tracks become light grey */
  .bdri-scorebar-track {
    background: #e5e7eb !important;
    border: 1px solid #cccccc !important;
  }
  .bdri-scorebar-fill {
    /* The inline style="background:#xx" sets the color — keep it; print engines often
       drop background colors unless print-color-adjust is exact */
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  /* Misalignment callout — preserve attention but black-on-light-yellow */
  .bdri-misalignment-callout {
    background: #fef3c7 !important;
    border-left: 4px solid #b45309 !important;
    color: #000000 !important;
    page-break-inside: avoid;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  .bdri-misalignment-icon {
    background: #b45309 !important;
    color: #ffffff !important;
  }
  .bdri-misalignment-heading,
  .bdri-misalignment-body p,
  .bdri-misalignment-why {
    color: #000000 !important;
  }
  /* Per-pillar accordions — force ALL open for print */
  .bdri-pillar-accordion {
    background: #ffffff !important;
    border: 1px solid #000000 !important;
    color: #000000 !important;
    page-break-inside: avoid;
    margin-bottom: 0.875rem !important;
  }
  .bdri-pillar-accordion .bdri-pillar-body {
    display: block !important;
  }
  .bdri-pillar-summary {
    color: #000000 !important;
  }
  .bdri-pillar-summary::before {
    display: none !important;
  }
  .bdri-pillar-name,
  .bdri-pillar-pct,
  .bdri-subdim-name,
  .bdri-subdim-score,
  .bdri-pillar-body h4 {
    color: #000000 !important;
  }
  .bdri-pillar-body a {
    color: #0F4C81 !important;
    text-decoration: underline;
  }
  .bdri-estimated-badge {
    background: #fef3c7 !important;
    border-left: 3px solid #b45309 !important;
    color: #000000 !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  /* Tier-3 disclaimer — keep visible, light grey */
  .disclaimer-tier3 {
    color: #444444 !important;
    border-top: 1px solid #cccccc !important;
    page-break-inside: avoid;
  }
  /* Heading colors */
  .bdri-report h2,
  .bdri-report h3,
  .bdri-report h4 {
    color: #000000 !important;
  }
  /* Avoid orphaned page breaks */
  h2, h3, h4 { page-break-after: avoid; }
  /* Hide focus outlines in print */
  *:focus { outline: 0 !important; }
}

/* ============================================
   BDRI methodology page styles (Phase 4.1)
   ============================================ */

/* TOC floats right inside article; text wraps left of it on desktop; TOC stacks above on mobile */
@media (min-width: 1024px) {
  .article-content.bdri-methodology {
    position: relative;
  }
}

.bdri-toc {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-soft, #2a3046);
  border-radius: var(--radius-md, 12px);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  font-size: 0.85rem;
}
.bdri-toc-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent-cyan, #60A5FA);
  margin-bottom: 0.85rem;
}
.bdri-toc-list {
  list-style: decimal inside;
  margin: 0;
  padding: 0;
  color: var(--color-text-light, #94A3B8);
  line-height: 1.7;
}
.bdri-toc-list li { margin: 0; padding: 0; }
.bdri-toc-list a {
  color: var(--color-text-light, #94A3B8);
  text-decoration: none;
  transition: color 0.15s;
}
.bdri-toc-list a:hover {
  color: var(--color-accent-cyan, #60A5FA);
}
.bdri-toc-extra {
  margin: 0.6rem 0 0;
  padding-top: 0.6rem;
  border-top: 1px solid var(--color-border-soft, #2a3046);
  font-size: 0.85rem;
}
.bdri-toc-extra a {
  color: var(--color-text-light, #94A3B8);
  text-decoration: none;
  transition: color 0.15s;
}
.bdri-toc-extra a:hover {
  color: var(--color-accent-cyan, #60A5FA);
}

@media (min-width: 1024px) {
  .bdri-toc {
    position: sticky;
    top: 80px;
    float: right;
    width: 240px;
    margin: 0 0 1.5rem 2rem;
    z-index: 1;
  }
}

/* Pull-quote for thesis statement */
.bdri-pullquote {
  border-left: 4px solid var(--color-accent-cyan, #60A5FA);
  background: rgba(96, 165, 250, 0.06);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
  border-radius: 0 var(--radius-md, 12px) var(--radius-md, 12px) 0;
}
.bdri-pullquote p {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-white, #F8FAFC);
  margin: 0 0 0.75rem;
}
.bdri-pullquote cite {
  font-style: normal;
  font-size: 0.8rem;
  color: var(--color-text-light, #94A3B8);
  letter-spacing: 0.04em;
}
/* A11y: byline last-reviewed span — brighten from muted so it passes 4.5:1 on dark bg */
.byline .last-reviewed { color: var(--color-text-light, #94A3B8); }
/* A11y: breadcrumb text (the › separators) — brighten from muted */
.breadcrumb { color: var(--color-text-light, #94A3B8); }
/* A11y: in-prose links underlined so they're distinguishable from surrounding text without color (WCAG 1.4.1) */
.article-content p a, .article-content li a { text-decoration: underline; text-decoration-color: rgba(96,165,250,0.45); text-underline-offset: 2px; }
.article-content p a:hover, .article-content li a:hover { text-decoration-color: currentColor; }

/* Concept-triangle placeholder (replaced in Phase 4.3) */
.bdri-concept-triangle-placeholder {
  text-align: center;
  padding: 2rem 1rem;
  background: rgba(96, 165, 250, 0.04);
  border: 1px dashed var(--color-border-soft, #2a3046);
  border-radius: var(--radius-md, 12px);
  margin: 1.5rem 0;
  color: var(--color-text-muted, #64748B);
  font-size: 0.85rem;
}

/* Worked-example tables — narrower than full table styling */
.article-content table.bdri-worked-example {
  margin: 1.5rem 0;
  font-size: 0.85rem;
}
.article-content table.bdri-worked-example caption {
  text-align: left;
  font-size: 0.85rem;
  color: var(--color-accent-cyan, #60A5FA);
  padding: 0.75rem 0;
  caption-side: top;
}
.article-content table.bdri-worked-example td {
  vertical-align: top;
  line-height: 1.5;
}
.article-content table.bdri-worked-example td:nth-child(1) { width: 22%; }
.article-content table.bdri-worked-example td:nth-child(2) { width: 48%; font-family: var(--font-mono, monospace); font-size: 0.78rem; }
.article-content table.bdri-worked-example td:nth-child(3) { width: 30%; }

/* Question-schema tables */
.article-content table.bdri-question-schema {
  margin: 1rem 0 2rem;
  font-size: 0.82rem;
}
.article-content table.bdri-question-schema caption {
  text-align: left;
  font-size: 0.95rem;
  color: var(--color-accent-cyan, #60A5FA);
  padding: 0.75rem 0;
  caption-side: top;
}
.article-content table.bdri-question-schema td {
  vertical-align: top;
  line-height: 1.5;
}
.article-content table.bdri-question-schema td:nth-child(1) { width: 22%; font-weight: 600; }
.article-content table.bdri-question-schema td:nth-child(2) { width: 38%; }
.article-content table.bdri-question-schema td:nth-child(3) { width: 40%; font-size: 0.78rem; color: var(--color-text-light, #94A3B8); }

/* Code block for formula */
.article-content pre {
  background: var(--color-bg-card, #181C28);
  border: 1px solid var(--color-border-soft, #2a3046);
  border-radius: var(--radius-md, 12px);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  max-width: 100%;
}
/* On desktop, keep methodology code blocks AND tables within the article-text
   column (left of the sticky right-floated TOC) so they don't overlap the float. */
@media (min-width: 1024px) {
  .bdri-methodology pre,
  .bdri-methodology table {
    max-width: 540px;
  }
}
/* Methodology code blocks: wrap long lines instead of horizontal scroll */
.bdri-methodology pre code {
  white-space: pre-wrap;
  word-break: normal;
  overflow-wrap: anywhere;
}
.article-content pre code {
  font-family: var(--font-mono, monospace);
  font-size: 0.82rem;
  color: var(--color-text, #CBD5E1);
  line-height: 1.6;
  white-space: pre;
}

/* Section spacing */
.bdri-methodology section {
  margin-top: 2.5rem;
  scroll-margin-top: 80px;
}
.bdri-methodology section:first-of-type {
  margin-top: 1.5rem;
}

/* Mobile: TOC stacks above article, not sticky */
@media (max-width: 1023px) {
  .bdri-toc { width: 100%; margin: 0 0 2rem; }
}

/* Phase 4.2 — reference inputs (dl) + references list + footnote markers */
.bdri-methodology dl { margin: 1rem 0; }
.bdri-methodology dt {
  font-weight: 700;
  color: var(--color-white, #F8FAFC);
  margin-top: 0.6rem;
  font-size: 0.92rem;
}
.bdri-methodology dd {
  margin: 0 0 0.4rem 0;
  padding-left: 1.25rem;
  color: var(--color-text, #CBD5E1);
  font-size: 0.92rem;
}
.bdri-references {
  list-style: decimal;
  padding-left: 2rem;
  margin: 1rem 0 1.5rem;
  font-size: 0.85rem;
}
.bdri-references li {
  margin-bottom: 0.75rem;
  color: var(--color-text-light, #94A3B8);
  line-height: 1.5;
}
.bdri-references li a {
  overflow-wrap: anywhere;
  word-break: break-word;
  font-family: var(--font-mono, monospace);
  font-size: 0.8rem;
}
.bdri-methodology sup a {
  text-decoration: none;
  color: var(--color-accent-cyan, #60A5FA);
  font-weight: 600;
}
.bdri-methodology sup a:hover {
  text-decoration: underline;
}

/* ===== BDRI Concept-Triangle Figure (Phase 4.3) ===== */
.bdri-concept-triangle {
  margin: 1.5rem 0 2rem;
  text-align: center;
  max-width: 100%;
}
/* On desktop, constrain figure to left ~540px so it doesn't overlap the right-floated TOC */
@media (min-width: 1024px) {
  .bdri-concept-triangle {
    max-width: 520px;
    margin-left: 0;
    margin-right: auto;
  }
}
.bdri-concept-triangle svg {
  width: 100%;
  max-width: 500px;
  height: auto;
  margin: 0 auto;
  display: block;
}
.bdri-concept-triangle figcaption {
  font-size: 0.82rem;
  color: var(--color-text-light, #94A3B8);
  margin-top: 0.75rem;
  padding: 0 1rem;
  line-height: 1.5;
  text-align: center;
}
/* ===== BDRI cross-link figure (Phase 9 — embeds concept-triangle in host articles) ===== */
.bdri-crosslink-figure {
  margin: 1.5rem 0;
  max-width: 500px;
}
.bdri-crosslink-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md, 12px);
}
.bdri-crosslink-figure figcaption {
  font-size: 0.82rem;
  color: var(--color-text-light, #94A3B8);
  margin-top: 0.5rem;
  line-height: 1.5;
}
/* ===== Residential Biometric Lock Matrix (Phase 7) ===== */
.matrix-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}
.matrix-filter-rail {
  background: var(--color-surface, #1E293B);
  border: 1px solid var(--color-border, #334155);
  border-radius: var(--radius-md, 12px);
  padding: 1rem;
  font-size: 0.9rem;
  align-self: start;
}
.matrix-filter-rail-placeholder {
  color: var(--color-text-light, #94A3B8);
  margin: 0;
}
.matrix-table-region {
  min-width: 0;
}
.matrix-status {
  font-size: 0.85rem;
  color: var(--color-text-light, #94A3B8);
  margin: 0 0 0.75rem 0;
}
.matrix-table-scroll {
  overflow-x: auto;
  border: 1px solid var(--color-border, #334155);
  border-radius: var(--radius-md, 12px);
  background: var(--color-surface, #1E293B);
  /* Reserve approximate height to keep CLS (Cumulative Layout Shift) low
     while the JS module parses + the 60-row table renders. The min-height
     is a no-op once the real rows fill the table because the table itself
     is taller than the reserve. */
  min-height: 720px;
}

.matrix-filter-rail {
  /* Same CLS-reserve rationale on the sidebar — the filter controls
     replace a single-line placeholder, so reserve roughly the final height. */
  min-height: 480px;
}
.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  table-layout: auto;
}
.matrix-table thead th {
  background: var(--color-surface-elevated, #0F172A);
  color: var(--color-text-light, #94A3B8);
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--color-border, #334155);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.matrix-table tbody td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--color-border-soft, #1F2937);
  vertical-align: top;
  color: var(--color-text, #E5E7EB);
}
.matrix-row:hover {
  background: rgba(56, 189, 248, 0.04);
}
.matrix-row .cell-brand strong {
  color: var(--color-text, #E5E7EB);
}
.matrix-row .cell-model {
  font-size: 0.82rem;
  color: var(--color-text-light, #94A3B8);
}
.matrix-row .cell-price {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.cell-toggle,
.cell-toggle-header {
  text-align: right;
  width: 3rem;
}
.matrix-row-toggle {
  background: transparent;
  border: 1px solid var(--color-border, #334155);
  color: var(--color-text, #E5E7EB);
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm, 6px);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0;
  font-family: inherit;
}
.matrix-row-toggle:hover,
.matrix-row-toggle:focus-visible {
  border-color: var(--color-accent, #38BDF8);
  color: var(--color-accent, #38BDF8);
  outline: none;
}
.matrix-row-toggle[aria-expanded="true"] {
  background: var(--color-accent, #38BDF8);
  color: var(--color-bg, #0F172A);
  border-color: var(--color-accent, #38BDF8);
}
.matrix-row-detail td {
  background: var(--color-surface-elevated, #0F172A);
  padding: 1rem 1.25rem !important;
}
.matrix-row-detail[hidden] {
  display: none;
}
.matrix-detail-grid {
  display: grid;
  gap: 1rem;
}
.matrix-detail-specs {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.35rem 1.25rem;
  margin: 0;
  font-size: 0.85rem;
}
.matrix-detail-specs dt {
  color: var(--color-text-light, #94A3B8);
  font-weight: 600;
}
.matrix-detail-specs dd {
  margin: 0;
  color: var(--color-text, #E5E7EB);
  word-break: break-word;
}
.matrix-detail-specs dd a {
  color: var(--color-accent, #38BDF8);
  word-break: break-all;
}
.matrix-detail-note {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--color-text, #E5E7EB);
  margin: 0;
  padding: 0.75rem;
  border-left: 3px solid var(--color-accent, #38BDF8);
  background: rgba(56, 189, 248, 0.06);
  border-radius: 0 var(--radius-sm, 6px) var(--radius-sm, 6px) 0;
}
.matrix-detail-known-issue {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--color-text, #E5E7EB);
  margin: 0;
  padding: 0.6rem 0.75rem;
  border-left: 3px solid #F59E0B;
  background: rgba(245, 158, 11, 0.08);
  border-radius: 0 var(--radius-sm, 6px) var(--radius-sm, 6px) 0;
}
.matrix-detail-known-issue strong {
  color: #F59E0B;
}
.matrix-detail-related {
  margin: 0;
  font-size: 0.85rem;
}
.matrix-detail-related a {
  color: var(--color-accent, #38BDF8);
}
.matrix-empty td {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--color-text-light, #94A3B8);
  font-size: 0.95rem;
}
.matrix-empty strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-text, #E5E7EB);
}
@media (max-width: 1024px) {
  .matrix-shell {
    grid-template-columns: 1fr;
  }
}
/* ===== Matrix filter rail (Phase 7.3) ===== */
.matrix-filter-heading {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.75rem 0;
  color: var(--color-text, #E5E7EB);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.78rem;
}
.matrix-filter-group {
  border: none;
  padding: 0;
  margin: 0 0 1rem 0;
}
.matrix-filter-legend {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-white);
  padding: 0;
  margin: 0 0 0.4rem 0;
}
.matrix-filter-choice {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0;
  font-size: 0.88rem;
  color: var(--color-text, #E5E7EB);
  cursor: pointer;
}
.matrix-filter-choice input {
  accent-color: var(--color-accent, #38BDF8);
  margin: 0;
  flex-shrink: 0;
}
.matrix-filter-price-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.matrix-filter-price-row input,
.matrix-filter-group input[type="number"] {
  width: 100%;
  min-width: 0;
  background: var(--color-surface-elevated, #0F172A);
  border: 1px solid var(--color-border, #334155);
  color: var(--color-text, #E5E7EB);
  border-radius: var(--radius-sm, 6px);
  padding: 0.4rem 0.5rem;
  font: inherit;
  font-size: 0.9rem;
}
.matrix-filter-price-row input:focus,
.matrix-filter-group input[type="number"]:focus {
  outline: 2px solid var(--color-accent, #38BDF8);
  outline-offset: -1px;
  border-color: var(--color-accent, #38BDF8);
}
.matrix-filter-dash {
  color: var(--color-text-light, #94A3B8);
}
.matrix-filter-reset {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid var(--color-border, #334155);
  color: var(--color-text-light, #94A3B8);
  border-radius: var(--radius-sm, 6px);
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
  margin-top: 0.25rem;
}
.matrix-filter-reset:hover,
.matrix-filter-reset:focus-visible {
  border-color: var(--color-accent, #38BDF8);
  color: var(--color-accent, #38BDF8);
  outline: none;
}
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
/* ===== Matrix detail-row share button (Phase 7.4) ===== */
.matrix-detail-share {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}
.matrix-detail-share-btn {
  padding: 0.4rem 0.85rem;
  background: transparent;
  border: 1px solid var(--color-border, #334155);
  color: var(--color-text, #E5E7EB);
  border-radius: var(--radius-sm, 6px);
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
}
.matrix-detail-share-btn:hover,
.matrix-detail-share-btn:focus-visible {
  border-color: var(--color-accent, #38BDF8);
  color: var(--color-accent, #38BDF8);
  outline: none;
}
.matrix-detail-share-msg {
  font-size: 0.82rem;
  color: var(--color-text-light, #94A3B8);
  font-style: italic;
}
/* ===== Matrix empty state (Phase 7.5) ===== */
.matrix-empty td {
  padding: 2.5rem 1.5rem;
  text-align: center;
}
.matrix-empty-heading {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  color: var(--color-text, #E5E7EB);
}
.matrix-empty-hint {
  margin: 0 0 1rem 0;
  font-size: 0.92rem;
  color: var(--color-text-light, #94A3B8);
  line-height: 1.55;
}
.matrix-empty-reset {
  padding: 0.55rem 1.25rem;
  background: var(--color-accent, #38BDF8);
  border: 1px solid var(--color-accent, #38BDF8);
  color: var(--color-bg, #0F172A);
  border-radius: var(--radius-sm, 6px);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
}
.matrix-empty-reset:hover,
.matrix-empty-reset:focus-visible {
  filter: brightness(1.1);
  outline: none;
}
/* ===== Matrix mobile layout (Phase 7.6) ===== */
/* Default: details renders inline (mobile-first). The desktop media query
   below force-opens and hides the disclosure on wide viewports. */
.matrix-filter-details {
  margin: 0;
  padding: 0;
  border: none;
}
.matrix-filter-summary {
  list-style: none;
  cursor: pointer;
  padding: 0.7rem 0.85rem;
  background: var(--color-surface-elevated, #0F172A);
  border: 1px solid var(--color-border, #334155);
  border-radius: var(--radius-sm, 6px);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text, #E5E7EB);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
/* Hide the default disclosure triangle and roll a chevron via ::after. */
.matrix-filter-summary::-webkit-details-marker {
  display: none;
}
.matrix-filter-summary::marker {
  content: '';
}
.matrix-filter-summary::after {
  content: '▾';
  font-size: 0.8rem;
  color: var(--color-text-light, #94A3B8);
  transition: transform 0.18s;
  margin-left: auto;
}
.matrix-filter-details[open] .matrix-filter-summary::after {
  transform: rotate(180deg);
}
.matrix-filter-summary-count {
  font-size: 0.78rem;
  color: var(--color-accent, #38BDF8);
  margin-left: 0.4rem;
  font-weight: 600;
}
/* Hide the redundant H3 heading on mobile (summary serves the role). */
.matrix-filter-details > .matrix-filter-heading {
  display: none;
}
/* On viewports wide enough for the sidebar layout, the summary disappears
   and the rail content stays visible regardless of details[open] state. */
@media (min-width: 1024px) {
  .matrix-filter-summary {
    display: none;
  }
  .matrix-filter-details {
    /* Force the panel open at the visual level so a closed details element
       doesn't hide the rail when the viewport is resized after a mobile
       collapse. */
    display: block;
  }
  .matrix-filter-details:not([open]) > :not(summary):not(.matrix-filter-heading) {
    display: revert;
  }
  .matrix-filter-details > .matrix-filter-heading {
    display: block;
  }
}
/* Enlarged tap targets on mobile — the methodology calls for >= 44 CSS px. */
@media (max-width: 767px) {
  .matrix-table tbody td {
    padding: 0.9rem 0.7rem;
    font-size: 0.92rem;
  }
  .matrix-row-toggle {
    width: 2.75rem;
    height: 2.75rem;
    font-size: 1.15rem;
  }
  .matrix-filter-choice {
    padding: 0.5rem 0;
    min-height: 2.75rem;
    font-size: 0.95rem;
  }
  .matrix-filter-reset {
    padding: 0.7rem 0.85rem;
  }
  .matrix-filter-price-row input,
  .matrix-filter-group input[type="number"] {
    padding: 0.6rem 0.7rem;
    font-size: 16px; /* avoid iOS Safari zoom on focus */
  }
  .matrix-detail-share-btn {
    padding: 0.6rem 1rem;
  }
}
/* Hide some less-critical columns at narrow mobile to keep the table usable
   without two-finger scrolling. The detail row still shows the full spec. */
@media (max-width: 600px) {
  .matrix-table .cell-sensor,
  .matrix-table .cell-capacity,
  .matrix-table .cell-smart,
  .matrix-table .cell-weather,
  .matrix-table thead th:nth-child(5),
  .matrix-table thead th:nth-child(6),
  .matrix-table thead th:nth-child(7),
  .matrix-table thead th:nth-child(8) {
    display: none;
  }
}