.features-page{--fx-tile:#f5f5f7;--fx-text:#1d1d1f;--fx-text-2:#6e6e73;--fx-text-3:#86868b;--fx-hair:rgba(0,0,0,.08);--fx-accent:var(--color-zen-primary);--fx-accent-text:#c4283b;--fx-accent-strong:#d42f43;--fx-accent-strong-hover:#bf2537;--fx-accent-soft:rgba(229,65,83,.1);--fx-mock-surface:#fff;--fx-mock-shadow:0 1px 2px rgba(0,0,0,.04),0 12px 32px rgba(0,0,0,.08);--fx-ok:#17723e;--fx-ok-soft:rgba(31,138,76,.1);--fx-warn:#a15c00;--fx-warn-soft:rgba(201,120,0,.12);--fx-ease:cubic-bezier(0.28,0.11,0.32,1);color:var(--fx-text);background:linear-gradient(180deg,transparent,#fff 360px);letter-spacing:-.01em}html.dark .features-page{--fx-tile:var(--zl-d-surface);--fx-text:var(--zl-d-text-1);--fx-text-2:var(--zl-d-text-3);--fx-text-3:var(--zl-d-text-4);--fx-hair:var(--zl-d-border);--fx-accent-text:#ff6b7c;--fx-accent-soft:rgba(255,107,124,.14);--fx-mock-surface:var(--zl-d-surface-3);--fx-mock-shadow:0 12px 32px 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var(--fx-ease)}.fx-chapter-nav[data-mode=hidden]{visibility:hidden;opacity:0;transform:translateY(24px);transition:opacity .24s var(--fx-ease),transform .24s var(--fx-ease),visibility 0s linear .24s}.fx-chapter-nav[data-mode=hidden] ul{pointer-events:none}@keyframes fx-nav-in{0%{opacity:0;transform:translateY(24px)}}.fx-chapter-track{position:relative;display:flex;max-width:100%;padding:4px;overflow-x:auto;border:1px solid rgba(0,0,0,.06);border-radius:999px;background:hsla(0,0%,100%,.72);box-shadow:0 1px 2px rgba(0,0,0,.04),0 10px 30px rgba(0,0,0,.1);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);pointer-events:auto;scrollbar-width:none}.fx-chapter-track::-webkit-scrollbar{display:none}html.dark .fx-chapter-track{border-color:hsla(0,0%,100%,.08);background:rgba(36,36,36,.72);box-shadow:0 10px 30px rgba(0,0,0,.5)}.fx-chapter-thumb{position:absolute;top:4px;bottom:4px;left:0;border-radius:999px;background:var(--fx-accent-strong);box-shadow:0 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