.page-shell { display: flex; min-height: 100vh; flex-direction: column; }
.page-main { flex: 1; }
.prose { max-width: var(--reading-width); }
.prose h1 { margin-bottom: var(--space-5); font-size: clamp(2.5rem, 7vw, 4.75rem); }
.prose h2 { margin-top: var(--space-7); margin-bottom: var(--space-3); font-size: 1.5rem; }
.prose p, .prose li { color: var(--text-secondary); }
.prose a { color: var(--accent); font-weight: 700; }

.hero { display: grid; min-height: min(48rem, calc(100vh - 4.5rem)); grid-template-columns: minmax(0, 1.55fr) minmax(17rem, 0.65fr); align-items: center; gap: clamp(3rem, 8vw, 8rem); padding-block: clamp(5rem, 11vw, 9rem); }
.hero > *, .section-heading > *, .principles-layout > *, .verify-layout > *, .open-source-layout > * { min-width: 0; }
.hero h1 { max-width: 12ch; margin-bottom: var(--space-5); }
.hero-description { max-width: 41rem; margin-bottom: var(--space-6); color: var(--text-secondary); font-size: clamp(1.05rem, 2vw, 1.25rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.trust-line { margin: var(--space-5) 0 0; color: var(--text-secondary); font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); }
.hero-proof { position: relative; padding: var(--space-6); overflow: hidden; }
.proof-signal { display: block; width: 0.8rem; height: 0.8rem; margin-bottom: var(--space-7); border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0.55rem var(--accent-soft); }
.proof-label { margin-bottom: var(--space-2); color: var(--text-secondary); font-size: var(--font-size-xs); font-weight: var(--font-weight-bold); letter-spacing: 0.08em; text-transform: uppercase; }
.proof-value { margin-bottom: var(--space-4); font-size: clamp(2.5rem, 5vw, 4rem); font-weight: var(--font-weight-bold); letter-spacing: -0.06em; line-height: var(--line-height-tight); }
.proof-note { margin: 0; color: var(--text-secondary); font-size: 0.9rem; }

.section-heading { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(17rem, 0.65fr); gap: var(--space-7); align-items: end; margin-bottom: var(--space-7); }
.section-heading h2 { max-width: 14ch; margin-bottom: 0; }
.section-heading > p { margin-bottom: 0; color: var(--text-secondary); }
.category-directory { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--space-4); }
.category-card { display: flex; min-width: 0; min-height: 15rem; grid-column: span 2; flex-direction: column; align-items: flex-start; padding: var(--space-5); color: inherit; text-decoration: none; transition: border-color var(--transition-fast), transform var(--transition-fast); }
.category-card:nth-child(4) { grid-column: 2 / span 2; }
.category-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.category-card__index { color: var(--accent); font-size: var(--font-size-xs); font-weight: var(--font-weight-bold); }
.category-card > * { min-width: 0; }
.category-card h3 { margin: var(--space-7) 0 var(--space-2); font-size: clamp(1.4rem, 3vw, 1.85rem); }
.category-card p { min-height: 3em; margin: 0 0 var(--space-4); color: var(--text-secondary); }
.category-card .text-link { margin-top: auto; }
.principles-layout { display: grid; grid-template-columns: minmax(17rem, 0.7fr) minmax(0, 1fr); gap: clamp(3rem, 9vw, 9rem); }
.section-intro h2 { max-width: 10ch; }
.section-intro p:last-child { max-width: 30rem; }
.principle-list article { display: grid; grid-template-columns: 2rem 1fr; gap: var(--space-4); padding-block: var(--space-5); border-top: 1px solid var(--border); }
.principle-list article:last-child { border-bottom: 1px solid var(--border); }
.principle-list article > span { color: var(--accent); font-size: var(--font-size-xs); font-weight: var(--font-weight-bold); }
.principle-list h3 { margin-bottom: var(--space-2); }
.principle-list p { margin: 0; color: var(--text-secondary); }

.verify-section { border-block: 1px solid var(--border); background: var(--bg-subtle); }
.verify-layout { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(20rem, 1fr); gap: clamp(3rem, 9vw, 8rem); align-items: center; }
.verify-layout h2 { max-width: 10ch; }
.verify-description { max-width: 34rem; color: var(--text-secondary); }
.verify-links { display: flex; flex-wrap: wrap; gap: var(--space-5); margin-top: var(--space-6); }
.verify-steps { margin: 0; padding: 0; list-style: none; counter-reset: verify; }
.verify-steps li { display: grid; grid-template-columns: 2.4rem 1fr; gap: var(--space-4); align-items: center; padding-block: var(--space-4); border-top: 1px solid var(--border-strong); counter-increment: verify; }
.verify-steps li:last-child { border-bottom: 1px solid var(--border-strong); }
.verify-steps li::before { display: grid; width: 2.25rem; height: 2.25rem; place-items: center; border: 1px solid var(--border-strong); border-radius: 50%; content: counter(verify); font-size: var(--font-size-xs); font-weight: var(--font-weight-bold); }

.open-source-layout { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-7); align-items: end; }
.open-source-layout h2 { margin-bottom: 0; }
.open-source-layout > div:last-child { max-width: 31rem; justify-self: end; }
.open-source-layout .button { margin-top: var(--space-4); }

@media (max-width: 52rem) {
  .hero { min-height: auto; grid-template-columns: 1fr; gap: var(--space-7); }
  .hero-proof { max-width: 30rem; }
  .section-heading, .principles-layout, .verify-layout, .open-source-layout { grid-template-columns: 1fr; gap: var(--space-6); }
  .section-heading > p, .open-source-layout > div:last-child { max-width: 38rem; justify-self: start; }
  .category-directory { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-card, .category-card:nth-child(4) { grid-column: auto; }
  .category-card:last-child { grid-column: span 2; }
}

@media (max-width: 30rem) {
  .hero-actions .button { width: 100%; }
  .category-directory { grid-template-columns: 1fr; }
  .category-card, .category-card:last-child { min-height: 12rem; grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) { .category-card:hover { transform: none; } }