:root {
  --bl-parchment: #F5F1EA;
  --bl-umber: #2C2A24;
  --bl-umber-soft: #5A5547;
  --bl-umber-muted: #8B7F65;
  --bl-clay: #8B6F47;
  --bl-sage: #6B7A4F;
  --bl-surface-warm: #EFE9DD;
  --bl-sand: #C4B896;
  --bl-earth-deep: #5A4A35;
  --bl-card-1: #E8DFC9;
  --bl-card-2: #D6DBC4;
  --bl-card-3: #E5CDB8;
  --bl-card-white: #FFFFFF;
  --bl-border: rgba(44,42,36,0.12);
  --bl-border-subtle: rgba(44,42,36,0.08);
  --bl-font-serif: 'Fraunces', Georgia, serif;
  --bl-font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--bl-font-sans);
  background: var(--bl-parchment);
  color: var(--bl-umber);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--bl-font-serif); font-weight: 400; color: var(--bl-umber); }
em { font-style: italic; color: var(--bl-clay); }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--bl-sage); outline-offset: 2px; }

/* Nav */
.bl-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 32px;
  max-width: 1200px;
  margin: 0 auto;
  border-bottom: 0.5px solid var(--bl-border);
}
.bl-logo { display: flex; align-items: center; gap: 10px; font-weight: 500; font-size: 16px; letter-spacing: -0.01em; }
.bl-logo-dot { width: 22px; height: 22px; border-radius: 50%; background: var(--bl-sage); position: relative; }
.bl-logo-dot::after { content: ''; position: absolute; inset: 5px; border-radius: 50%; background: var(--bl-parchment); }
.bl-nav-links { display: flex; gap: 28px; font-size: 14px; color: var(--bl-umber-soft); }
.bl-nav-cta {
  background: var(--bl-umber); color: var(--bl-parchment);
  padding: 8px 16px; border-radius: 100px; font-size: 13px;
  border: none; cursor: pointer; font-family: inherit;
}

/* Hero */
.bl-hero {
  max-width: 1200px; margin: 0 auto;
  padding: 56px 32px 48px;
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 48px; align-items: center;
}
.bl-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--bl-sage);
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: 20px;
}
.bl-eyebrow-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--bl-sage); }
.bl-hero-text h1 {
  font-size: 52px; line-height: 1.05; letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.bl-hero-sub {
  font-size: 17px; line-height: 1.6; color: var(--bl-umber-soft);
  margin-bottom: 28px; max-width: 460px;
}
.bl-cta-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.bl-btn-primary {
  background: var(--bl-umber); color: var(--bl-parchment);
  padding: 14px 24px; border-radius: 100px;
  font: 500 14px var(--bl-font-sans); border: none; cursor: pointer;
  transition: background 0.15s;
}
.bl-btn-primary:hover { background: #1f1d18; }
.bl-btn-secondary {
  background: transparent; color: var(--bl-umber);
  padding: 14px 20px; font: 400 14px var(--bl-font-sans);
  border: none; cursor: pointer;
  display: flex; align-items: center; gap: 8px;
}

.bl-hero-visual {
  aspect-ratio: 1/1; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--bl-sand) 0%, var(--bl-clay) 55%, var(--bl-earth-deep) 100%);
  position: relative; overflow: hidden;
}
.bl-ring { position: absolute; border-radius: 50%; border: 0.5px solid rgba(245,241,234,0.35); }
.bl-ring-1 { inset: 12%; } .bl-ring-2 { inset: 24%; } .bl-ring-3 { inset: 36%; }
.bl-pulse-label {
  position: absolute; bottom: 14%; left: 50%;
  transform: translateX(-50%); color: var(--bl-parchment);
  font-size: 11px; letter-spacing: 0.15em;
  text-transform: uppercase; opacity: 0.85;
}
.bl-pulse-num {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%); color: var(--bl-parchment);
  font-family: var(--bl-font-serif); font-size: 56px; font-weight: 300;
}

/* Stats */
.bl-stats {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 32px; background: var(--bl-surface-warm);
  border-top: 0.5px solid var(--bl-border);
  border-bottom: 0.5px solid var(--bl-border);
}
.bl-stat { padding: 0 24px; }
.bl-stat:not(:last-child) { border-right: 0.5px solid var(--bl-border); }
.bl-stat-num {
  font-family: var(--bl-font-serif); font-size: 36px;
  font-weight: 400; line-height: 1; margin-bottom: 8px;
}
.bl-stat-label { font-size: 13px; color: var(--bl-umber-soft); line-height: 1.5; }
.bl-stat-cite {
  font-size: 11px; color: var(--bl-umber-muted);
  margin-top: 6px; font-style: italic;
}

/* Section */
.bl-section { max-width: 1200px; margin: 0 auto; padding: 56px 32px; }
.bl-section-head {
  display: flex; justify-content: space-between; align-items: end;
  margin-bottom: 32px; gap: 24px;
}
.bl-section-head h2 {
  font-size: 32px; letter-spacing: -0.015em;
  max-width: 480px; line-height: 1.15;
}
.bl-section-link { font-size: 13px; color: var(--bl-sage); white-space: nowrap; }

/* Protocol cards */
.bl-protocols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.bl-card {
  background: var(--bl-card-white); border-radius: 14px;
  padding: 24px; border: 0.5px solid var(--bl-border-subtle);
}
.bl-card-icon {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.bl-card-tag {
  font-size: 11px; color: var(--bl-umber-muted);
  text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 6px;
}
.bl-card h3 {
  font-family: var(--bl-font-serif); font-size: 20px;
  font-weight: 400; margin-bottom: 8px;
}
.bl-card-desc {
  font-size: 13px; line-height: 1.55;
  color: var(--bl-umber-soft); margin-bottom: 16px;
}
.bl-card-meta {
  display: flex; gap: 12px; font-size: 11px;
  color: var(--bl-umber-muted); padding-top: 12px;
  border-top: 0.5px solid var(--bl-border-subtle);
}

/* Science (dark) */
.bl-science {
  background: var(--bl-umber); color: var(--bl-sand);
  padding: 56px 32px;
}
.bl-science-grid {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px; align-items: center;
}
.bl-science h2 {
  font-size: 30px; line-height: 1.2; margin-bottom: 16px;
}
.bl-science-text {
  font-size: 15px; line-height: 1.65;
  color: var(--bl-sand); margin-bottom: 24px;
}
.bl-science-list { list-style: none; }
.bl-science-list li {
  font-size: 13px; color: var(--bl-sand);
  padding: 10px 0;
  border-bottom: 0.5px solid rgba(196,184,150,0.18);
  display: flex; justify-content: space-between;
}
.bl-science-list li:last-child { border-bottom: none; }
.bl-science-list span { color: var(--bl-umber-muted); font-style: italic; }

/* Footer */
.bl-footer {
  padding: 32px; text-align: center;
  font-size: 12px; color: var(--bl-umber-muted);
  border-top: 0.5px solid var(--bl-border);
  max-width: 1200px; margin: 0 auto;
}

/* Mobile */
@media (max-width: 900px) {
  .bl-nav { padding: 16px 20px; }
  .bl-nav-links { display: none; }
  .bl-hero { grid-template-columns: 1fr; padding: 40px 20px; gap: 32px; }
  .bl-hero-text h1 { font-size: 40px; }
  .bl-hero-visual { max-width: 320px; margin: 0 auto; }
  .bl-stats { grid-template-columns: 1fr; padding: 0; }
  .bl-stat { padding: 24px 20px; border-right: none !important; }
  .bl-stat:not(:last-child) { border-bottom: 0.5px solid var(--bl-border); }
  .bl-section { padding: 40px 20px; }
  .bl-section-head { flex-direction: column; align-items: start; gap: 12px; }
  .bl-section-head h2 { font-size: 28px; }
  .bl-protocols { grid-template-columns: 1fr; }
  .bl-science { padding: 40px 20px; }
  .bl-science-grid { grid-template-columns: 1fr; gap: 24px; }
}