.q19-showcase,.q19-showcase *{box-sizing:border-box}
.q19-showcase{max-width:1280px;margin:0 auto 64px;padding:clamp(20px,4vw,56px);display:grid;grid-template-columns:minmax(280px,.85fr) minmax(320px,1.15fr);gap:clamp(24px,5vw,72px);align-items:start;background:#fff;border:1px solid #e0e7f1;border-radius:22px;box-shadow:0 18px 50px rgba(18,37,72,.08);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#17233b}
.q19-intro{position:sticky;top:28px}
.q19-eyebrow{color:#ad6719;font-size:.78rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase}
.q19-intro h2{font-size:clamp(2rem,4vw,3.4rem);line-height:1.08;margin:14px 0 22px;letter-spacing:-.035em}
.q19-intro p{line-height:1.62}
.q19-note{padding:14px 18px;border-left:4px solid #e9a442;background:#fff8ec;font-size:.9rem}
.q19-hint{font-size:.9rem;color:#425673}
.q19-viewer{min-width:0;border:1px solid #d9e2ee;border-radius:16px;background:#e9edf3;overflow:hidden}
.q19-viewer:focus-visible,.q19-pages:focus-visible{outline:3px solid #f0ae38;outline-offset:3px}
.q19-viewer-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:15px 20px;background:#153b6a;color:#fff;font-size:.9rem}
.q19-viewer-header span{font-size:.82rem}
.q19-pages{max-height:min(78vh,900px);overflow-y:auto;overscroll-behavior:contain;scroll-snap-type:y proximity;scrollbar-gutter:stable;position:relative;padding:18px}
.q19-sheet{margin:0 auto 22px;max-width:550px;scroll-snap-align:start}
.q19-sheet figcaption{padding:8px 2px 12px;color:#334760;font-size:.88rem;font-weight:700}
.q19-sheet figcaption span{display:inline-flex;align-items:center;justify-content:center;width:27px;height:27px;margin-right:8px;border-radius:50%;background:#153b6a;color:#fff;font-size:.72rem}
.q19-sheet img{display:block;width:100%;height:auto;background:white;box-shadow:0 9px 25px rgba(19,43,77,.18);user-select:none;-webkit-user-select:none;-webkit-user-drag:none}
@media(max-width:840px){.q19-showcase{grid-template-columns:1fr;margin:0 16px 40px}.q19-intro{position:static}.q19-pages{max-height:75vh;padding:12px}.q19-viewer-header{padding:12px 14px}}