/* Only the platform tab is restyled. The four-tab header and the other pages
   retain the current application's shared styles and theme tokens. */
.pi-page{--surface:var(--white);--raised:var(--surface-tinted);--note:var(--surface-tinted);max-width:1500px;margin:auto;padding:28px 24px 50px}
.pi-page .hero{display:flex;align-items:start;justify-content:space-between;gap:20px;margin-bottom:20px}
.pi-page .hero h1{font-size:28px;line-height:1.25;margin:0 0 8px}
.pi-page .hero p{font-size:13px;color:var(--muted)}
.pi-page .preview-badge{white-space:nowrap;background:var(--surface);border:1px solid var(--line);border-radius:7px;padding:6px 10px;font-size:11px;color:var(--muted)}
.pi-page .split{display:grid;grid-template-columns:minmax(230px,300px) minmax(0,1fr);gap:16px;align-items:start;scroll-margin-top:calc(var(--pi-header-height,72px) + 12px)}
.pi-page .list-panel,.pi-page .detail-panel{background:var(--surface);border:1px solid var(--line);border-radius:13px;min-width:0}
.pi-page .list-panel{position:sticky;top:calc(var(--pi-header-height,72px) + 16px);max-height:calc(100vh - var(--pi-header-height,72px) - 28px)}
.pi-page .group-title{padding:15px 16px 10px;border-bottom:1px solid var(--line)}
.pi-page .group-title h2{font-size:15px;margin:0}
.pi-page .group-title p{font-size:11px;color:var(--muted);margin-top:3px}
.pi-page .pi-jump{display:block;min-height:44px;text-align:left;border:0;background:none;padding:6px 0;color:var(--accent);font-size:11px;font-weight:700;text-decoration:underline;text-underline-offset:3px}
.pi-page .list-scroll{max-height:calc(100vh - var(--pi-header-height,72px) - 135px);overflow:auto;overscroll-behavior:contain}
.pi-page .continent-title{padding:17px 16px 10px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--raised)}
.pi-page .continent-title h2{font-size:15px;margin:0}
.pi-page .continent-title p{font-size:11px;color:var(--muted);margin-top:3px}
.pi-page .continent-group{border-bottom:1px solid var(--line)}
.pi-page .continent-group summary{display:flex;align-items:center;gap:8px;min-height:48px;padding:8px 16px;cursor:pointer;list-style:none;background:var(--raised);font-weight:700}
.pi-page .continent-group summary::-webkit-details-marker{display:none}
.pi-page .continent-group summary::after{content:'＋';margin-left:auto;color:var(--accent)}
.pi-page .continent-group[open] summary::after{content:'－'}
.pi-page .continent-group summary:focus-visible{outline:3px solid var(--focus);outline-offset:-3px}
.pi-page .continent-group summary small{color:var(--muted);font-size:11px;font-weight:500}
.pi-page .continent-group .platform-row{padding-left:25px;min-height:70px}
.pi-page .platform-row{width:100%;min-height:88px;display:block;text-align:left;border:0;border-bottom:1px solid var(--line);border-left:3px solid transparent;background:transparent;padding:11px 14px}
.pi-page .platform-row:last-child{border-bottom:0}
.pi-page .platform-row:hover{background:var(--raised)}
.pi-page .platform-row[aria-current="true"]{background:var(--soft);border-left-color:var(--accent)}
.pi-page .row-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.pi-page .row-head strong{font-size:16px;line-height:1.35}
.pi-page .row-chevron{color:var(--muted);font-size:18px}
.pi-page .row-meta,.pi-page .row-dynamic{display:block;color:var(--muted);font-size:11px;margin-top:4px}
.pi-page .row-sample{display:block;font-size:10px;color:var(--accent);font-weight:650}
.pi-page .detail-panel{min-height:480px;overflow:visible}
.pi-page .detail-back{display:none}
.pi-page .detail-head{padding:22px 24px;border-bottom:1px solid var(--line)}
.pi-page .eyebrow{font-size:11px;font-weight:700;color:var(--accent);letter-spacing:.08em}
.pi-page .detail-head h2{font-size:24px;line-height:1.25;margin:4px 0 6px}
.pi-page .detail-head p{color:var(--muted);font-size:12px}
.pi-page .detail-intro{font-size:13px!important;color:var(--ink)!important;line-height:1.65;margin-top:10px!important;max-width:75ch}
.pi-page .detail-body{padding:0 24px 22px}
.pi-page .chapter-nav{position:sticky;top:var(--pi-header-height,72px);z-index:2;display:flex;gap:8px;overflow:auto;background:var(--surface);border-bottom:1px solid var(--line);padding:10px 24px}
.pi-page .chapter-nav button{flex:none;min-height:40px;border:1px solid var(--line);border-radius:8px;background:var(--raised);padding:6px 11px;font-size:11px;color:var(--ink)}
.pi-page .chapter-nav button:hover{border-color:var(--accent);background:var(--soft)}
.pi-page .detail-section{padding:18px 0;border-bottom:1px solid var(--line)}
.pi-page .detail-section:last-child{border-bottom:0}
.pi-page .section-title{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:11px}
.pi-page .section-title h3{font-size:16px;margin:0}
.pi-page .section-title small{font-size:11px;color:var(--muted)}
.pi-page .facts-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.pi-page .identity-grid,.pi-page .business-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}
.pi-page .business-steps{margin:12px 0}
.pi-page .fact-box,.pi-page .business-step{background:var(--raised);border:1px solid var(--line);border-radius:9px;padding:12px 14px;min-width:0}
.pi-page .fact-box small,.pi-page .business-step small{display:block;color:var(--muted);font-size:11px}
.pi-page .business-step small{color:var(--accent);font-size:10px;font-weight:700}
.pi-page .fact-box strong,.pi-page .business-step strong{display:block;margin-top:4px;font-size:13px}
.pi-page .business-step strong{font-size:12px}
.pi-page .fact-box p,.pi-page .business-step p{font-size:11px;color:var(--muted);margin-top:5px}
.pi-page .market-chips,.pi-page .source-stack{display:flex;gap:7px;flex-wrap:wrap}
.pi-page .source-stack{margin-top:10px}
.pi-page .chip,.pi-page .evidence-chip{display:inline-flex;align-items:center;border:1px solid var(--line);background:var(--raised);border-radius:7px;padding:3px 9px;font-size:11px}
.pi-page .chip{min-height:26px}
.pi-page .evidence-chip{background:var(--note);color:var(--accent);margin-right:6px;font-size:10px}
.pi-page .note{font-size:12px;color:var(--muted);background:var(--note);border:1px solid var(--line);border-radius:9px;padding:11px 13px}
.pi-page .note strong,.pi-page .claim strong{color:var(--ink)}
.pi-page .claim{border-left:3px solid var(--accent);padding:10px 13px;margin:10px 0;background:var(--raised);border-radius:0 8px 8px 0;font-size:12px;color:var(--muted)}
.pi-page .prose{font-size:13px;line-height:1.75;color:var(--ink);margin:8px 0}
.pi-page .micro,.pi-page .source-label{font-size:11px;color:var(--muted);margin-top:7px}
.pi-page .source-link{display:inline-block;margin-top:5px;font-size:11px;font-weight:650}
.pi-page .source-stack a{font-size:11px;font-weight:650;padding:6px 9px;border:1px solid var(--line);border-radius:7px;background:var(--raised)}
.pi-page .market-fact{display:grid;grid-template-columns:80px 1fr;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:12px}
.pi-page .market-fact:last-child{border-bottom:0}
.pi-page .market-fact p{font-size:12px;color:var(--ink)}
.pi-page .market-fact small{display:block;font-size:11px;color:var(--muted);margin-top:5px}
.pi-page .timeline-item{padding:11px 0;border-bottom:1px solid var(--line)}
.pi-page .timeline-item:last-child{border-bottom:0}
.pi-page .timeline-item strong{font-size:13px}
.pi-page .timeline-item p{color:var(--muted);font-size:12px;margin-top:5px}
.pi-page .timeline-item small{display:block;color:var(--muted);font-size:11px;margin-top:4px}
.pi-page .kind{display:inline-block;color:var(--accent);background:var(--soft);border-radius:5px;padding:1px 6px;font-size:10px;font-weight:650;margin-right:6px}
.pi-page .empty{padding:38px 16px;text-align:center;color:var(--muted)}
.pi-page .empty strong{display:block;color:var(--ink)}
@media(max-width:900px){.pi-page .split{grid-template-columns:minmax(210px,255px) minmax(0,1fr)}.pi-page .identity-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.pi-page .detail-head{padding:18px}.pi-page .detail-body{padding:0 18px 18px}}
@media(max-width:760px){.pi-page{padding:23px 16px 40px}.pi-page .hero{display:block}.pi-page .hero h1{font-size:25px}.pi-page .preview-badge{display:inline-block;margin-top:12px}.pi-page .split{display:block}.pi-page .list-panel{position:static;max-height:none}.pi-page .list-scroll,.pi-page .detail-panel{min-height:0;max-height:none}.pi-page .detail-panel{scroll-margin-top:calc(var(--pi-header-height,110px) + 16px)}.pi-page:not(.show-detail-page) .detail-panel,.pi-page.show-detail-page .list-panel{display:none}.pi-page .detail-back{display:inline-flex;align-items:center;min-height:44px;border:0;background:transparent;color:var(--accent);font-weight:700;padding:0 18px}.pi-page .chapter-nav{position:relative;top:auto;padding:9px 18px}.pi-page .identity-grid,.pi-page .business-steps,.pi-page .facts-grid{grid-template-columns:1fr}.pi-page .detail-body{padding:0 18px 16px}.pi-page .market-fact{grid-template-columns:65px 1fr}}
@media(prefers-reduced-motion:reduce){.pi-page *{scroll-behavior:auto!important}}