.folder-shelf{--ease-snap:cubic-bezier(0.34,1.2,0.64,1);--ease-out:cubic-bezier(0.22,1,0.36,1);margin-top:4rem;padding-top:3rem;border-top:1px solid var(--color-line)}.folder-shelf__intro{margin-bottom:1.75rem}.folder-shelf__hint{margin-top:1.25rem;font-family:var(--font-ibm),ui-monospace,monospace;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--color-muted)}.folder-shelf__folders{display:flex;align-items:flex-end;justify-content:center;gap:clamp(8px,2vw,20px);min-height:200px;padding:20px 0 28px;perspective:900px}.folder-shelf-folder{flex:0 0 auto;width:clamp(88px,14vw,128px);background:none;border:none;padding:0;color:var(--color-ink);text-align:center;cursor:pointer;transition:transform .55s var(--ease-snap),opacity .45s,filter .45s;transform:scale(.88);opacity:.48;filter:blur(.3px)}.folder-shelf-folder.is-active{transform:scale(1.08);opacity:1;filter:none;z-index:2}.folder-shelf-folder.is-featured.is-active{transform:scale(1.16)}.folder-shelf-folder__icon{position:relative;width:100%;aspect-ratio:1/.82;margin-bottom:12px;transition:transform .45s var(--ease-snap)}.folder-shelf-folder.is-active .folder-shelf-folder__icon{transform:translateY(-6px)}.folder-shelf-folder__tab{position:absolute;top:8%;left:12%;width:38%;height:14%;border-radius:6px 6px 0 0;background:linear-gradient(180deg,var(--folder-light),var(--folder-mid));box-shadow:inset 0 1px 0 rgba(255,255,255,.25)}.folder-shelf-folder__body{position:absolute;inset:18% 0 0;border-radius:10px;background:linear-gradient(145deg,var(--folder-light) 0,var(--folder-mid) 45%,var(--folder-dark) 100%);box-shadow:0 12px 28px rgba(28,25,23,.16),inset 0 1px 0 rgba(255,255,255,.22)}.folder-shelf-folder.is-featured .folder-shelf-folder__ribbon{position:absolute;top:-8px;right:-4px;font-family:var(--font-ibm),ui-monospace,monospace;font-size:8px;letter-spacing:.06em;text-transform:uppercase;padding:4px 7px;border-radius:999px;background:var(--color-accent);color:#fff;font-weight:600;z-index:2}.folder-shelf-folder__title{display:block;font-family:var(--font-instrument),system-ui,sans-serif;font-size:13px;font-weight:600;letter-spacing:-.01em;margin-bottom:4px}.folder-shelf-folder__sub{display:block;font-family:var(--font-ibm),ui-monospace,monospace;font-size:10px;color:var(--color-muted);line-height:1.35;max-width:14ch;margin:0 auto}.folder-shelf-folder[data-id=experience]{--folder-light:#6ecfb8;--folder-mid:#3a9a86;--folder-dark:#1f5c4f}.folder-shelf-folder[data-id=method]{--folder-light:#9eb4d4;--folder-mid:#5a7a9e;--folder-dark:#2d4158}.folder-shelf-folder[data-id=builds]{--folder-light:#c4a8e8;--folder-mid:#8b6bb8;--folder-dark:#4a3568}.folder-shelf-folder[data-id=ai-eval]{--folder-light:#a8b8e8;--folder-mid:#6a7ab8;--folder-dark:#343e68}.folder-shelf-folder[data-id=agent-lab]{--folder-light:#f0c078;--folder-mid:#c8923a;--folder-dark:#6b4a18}.folder-shelf-folder[data-id=stack]{--folder-light:#88c4e8;--folder-mid:#4a94c4;--folder-dark:#255a78}.folder-shelf-folder[data-id=about]{--folder-light:#e8a8b8;--folder-mid:#b86a7a;--folder-dark:#6a3848}.folder-shelf__preview{margin-top:4px;padding:clamp(20px,4vw,32px);border-radius:16px;background:var(--color-paper-2);border:1px solid var(--color-line);text-align:center}.folder-shelf__preview-title{font-family:var(--font-cormorant),Georgia,serif;font-size:clamp(1.5rem,3vw,2rem);font-weight:500;color:var(--color-ink);margin:0 0 8px}.folder-shelf__preview-desc{font-size:15px;color:var(--color-muted);max-width:48ch;margin:0 auto 20px;line-height:1.55}.folder-shelf__stats{display:flex;flex-wrap:wrap;justify-content:center;gap:20px 28px;margin-bottom:24px}.folder-shelf__stat strong{display:block;font-family:var(--font-cormorant),Georgia,serif;font-size:1.5rem;color:var(--color-accent)}.folder-shelf__stat span{font-family:var(--font-ibm),ui-monospace,monospace;font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--color-muted)}.folder-shelf__nav{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:20px}.folder-shelf-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;border:1px solid var(--color-line);background:var(--color-paper);color:var(--color-ink);font-family:var(--font-instrument),system-ui,sans-serif;font-size:13px;font-weight:500;cursor:pointer;transition:background .2s,border-color .2s,transform .2s var(--ease-snap)}.folder-shelf-btn:hover{border-color:var(--color-accent);transform:translateY(-1px)}.folder-shelf-btn--primary{background:var(--color-ink);border-color:var(--color-ink);color:var(--color-paper)}.folder-shelf-btn--primary:hover{background:#2a2522;border-color:#2a2522}.folder-shelf-round{width:40px;height:40px;border-radius:50%;border:1px solid var(--color-line);background:var(--color-paper);color:var(--color-ink);font-size:18px;line-height:1;cursor:pointer}.folder-shelf-round:hover{border-color:var(--color-accent)}@media (max-width:900px){.folder-shelf__folders{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));align-items:end;justify-items:center;min-height:auto;gap:16px 10px}.folder-shelf-folder{width:100%;max-width:120px}.folder-shelf-folder:not(.is-active){transform:scale(.88);opacity:.42}}@media (max-width:640px){.folder-shelf{margin-top:2.5rem;padding-top:2rem}.folder-shelf__folders{grid-template-columns:repeat(3,minmax(0,1fr))}.folder-shelf-folder__sub{max-width:16ch}.folder-shelf__nav{gap:16px}.folder-shelf-round{width:44px;height:44px}.folder-shelf-btn{min-height:44px;width:min(100%,280px);justify-content:center}}@media (max-width:520px){.folder-shelf__folders{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 12px}.folder-shelf-folder{max-width:148px}}