.part-intro{background:var(--bg-primary);color:var(--text-primary);min-height:100vh}.part-intro-topbar{display:flex;justify-content:space-between;align-items:center;padding:22px clamp(20px,4vw,64px);border-bottom:1px solid var(--border-subtle);background:var(--bg-secondary);font-family:var(--font-mono);font-size:13px;letter-spacing:.28em;text-transform:uppercase}.part-intro-back{color:var(--text-secondary);text-decoration:none;transition:color .18s ease}.part-intro-back:hover{color:var(--accent-gold)}.part-intro-topbar-meta{color:var(--text-muted)}.part-intro-hero{padding:clamp(72px,10vw,140px) 0 clamp(48px,6vw,88px);text-align:center;background:radial-gradient(ellipse 60% 50% at 50% 35%,color-mix(in srgb,var(--part-color) 14%,transparent),transparent 72%),var(--bg-primary);border-bottom:1px solid var(--border-subtle)}.part-intro-rule{width:56px;height:2px;background:var(--part-color);margin:0 auto 28px;border-radius:2px}.part-intro-label{font-family:var(--font-mono);font-size:14px;letter-spacing:.36em;text-transform:uppercase;color:var(--part-color);margin-bottom:28px}.part-intro-title{font-weight:900;font-size:clamp(48px,7vw,88px);line-height:1.02;letter-spacing:-.02em;margin:0 auto 28px;max-width:18ch}.part-intro-theme,.part-intro-title{font-family:var(--font-display);color:var(--text-primary)}.part-intro-theme{font-style:italic;font-size:clamp(20px,2.3vw,26px);line-height:1.45;margin:0 auto 18px;max-width:30ch}.part-intro-teaser{font-family:var(--font-body);font-size:17px;line-height:1.65;color:var(--text-secondary);margin:0 auto 36px;max-width:48ch}.part-intro-meta{display:inline-flex;align-items:center;gap:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--text-secondary)}.part-intro-meta-dot{width:4px;height:4px;border-radius:50%;background:var(--part-color)}.part-intro-body{padding:clamp(40px,6vw,80px) 0 0;--part-c:var(--part-color)}.part-intro-body li,.part-intro-body p{font-family:var(--font-body);font-size:calc(19px * var(--reader-font-scale, 1));line-height:1.78;color:var(--text-primary)}.part-intro-body .block-lead{font-size:calc(22px * var(--reader-font-scale, 1))!important}.part-intro-chapters{padding:clamp(56px,7vw,96px) 0}.part-intro-section-label{font-family:var(--font-mono);font-size:13px;letter-spacing:.32em;text-transform:uppercase;color:var(--text-secondary);margin-bottom:36px;text-align:center}.part-chapter-list{list-style:none;padding:0;margin:0 0 48px;display:flex;flex-direction:column;gap:0}.part-chapter-row{border-top:1px solid var(--border-subtle)}.part-chapter-row:last-child{border-bottom:1px solid var(--border-subtle)}.part-chapter-link{display:grid;grid-template-columns:64px 1fr auto;grid-gap:24px;gap:24px;align-items:start;padding:28px 18px 28px 8px;color:inherit;text-decoration:none;position:relative;transition:padding-left .24s ease,background .2s ease}.part-chapter-link:before{content:"";position:absolute;left:-8px;top:22px;bottom:22px;width:2px;border-radius:2px;background:var(--part-color);opacity:0;transform:scaleY(.4);transition:opacity .22s ease,transform .28s cubic-bezier(.2,.7,.2,1)}.part-chapter-link:hover{padding-left:18px;background:rgba(255,255,255,.02)}.part-chapter-link:hover:before{opacity:1;transform:scaleY(1)}.part-chapter-num{font-family:var(--font-mono);font-size:22px;font-weight:500;color:var(--part-color);letter-spacing:.02em;padding-top:2px}.part-chapter-title{font-family:var(--font-display);font-weight:700;font-size:22px;line-height:1.25;letter-spacing:-.005em;margin:0 0 8px;color:var(--text-primary)}.part-chapter-summary{font-family:var(--font-body);font-size:16px;line-height:1.55;color:var(--text-secondary);margin:0;max-width:64ch}.part-chapter-meta{display:flex;align-items:center;gap:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--text-secondary);white-space:nowrap;padding-top:8px}.part-chapter-arrow{color:var(--part-color);font-size:18px;transition:transform .28s cubic-bezier(.2,.7,.2,1)}.part-chapter-link:hover .part-chapter-arrow{transform:translateX(4px)}.part-intro-cta-row{display:flex;justify-content:center;margin-top:8px}.part-intro-cta{font-size:16px;padding:16px 28px}.part-intro-nav{border-top:1px solid var(--border-subtle);background:var(--bg-secondary);padding:clamp(40px,5vw,64px) 0}.part-intro-nav-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:clamp(24px,4vw,56px);gap:clamp(24px,4vw,56px)}.part-intro-nav-next{text-align:right}.part-intro-nav-link{display:inline-flex;flex-direction:column;gap:8px;text-decoration:none;color:inherit;transition:opacity .2s ease}.part-intro-nav-link:hover{opacity:.78}.part-intro-nav-kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.32em;text-transform:uppercase;color:var(--text-muted)}.part-intro-nav-title{font-family:var(--font-display);font-size:17px;line-height:1.4;color:var(--text-primary);max-width:32ch}@media (max-width:720px){.part-intro-topbar{font-size:11px;letter-spacing:.22em;padding:16px 20px}.part-chapter-link{grid-template-columns:44px 1fr}.part-chapter-meta{grid-column:2/3;padding-top:4px}.part-intro-nav-grid{grid-template-columns:1fr}.part-intro-nav-next{text-align:left}}@media (max-width:880px){.part-intro-body li,.part-intro-body p{font-size:18px;line-height:1.7}.part-intro-body .block-lead{font-size:19.5px!important;line-height:1.6!important;max-width:100%}.part-intro-body .block-lead:first-letter{font-size:52px;padding-right:10px}.part-intro-body .block-paragraph{max-width:100%}}