.osc{--ink:var(--color-ink-body);--cyan-deep:var(--color-navy);--gray:var(--color-ink-muted);--serif:var(--font-display);--mono:ui-monospace,"Consolas","Monaco",monospace;--r:var(--radius-card);--sidebar:290px;--header:73px;font-family:var(--font-body);color:var(--color-ink-body);line-height:1.65;-webkit-font-smoothing:antialiased}.osc *{box-sizing:border-box}.osc .ba-tile,.osc .card,.osc .ch,.osc .cover,.osc .danger,.osc .doit,.osc .drawer,.osc .flip-back,.osc .inh,.osc .interactive,.osc .led.do,.osc .org .dept,.osc .pyr-row,.osc .road-col,.osc .std,.osc .std-card{background-image:var(--tex-card);background-blend-mode:soft-light}.osc .spark{display:inline-block;vertical-align:middle}.osc .spark svg{display:block}.osc .new-term em{font-style:italic;color:var(--color-navy);font-weight:600}.osc .card .ic{margin-bottom:12px}.osc .card .ic,.osc .drawer-h .di{display:flex;align-items:center;color:var(--color-ink-soft)}.osc .frame .fi{display:flex;justify-content:center;margin:8px 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20px;font-size:var(--text-body-md);color:var(--color-ink-body)}.osc .takeaway b{font-weight:700;color:var(--color-ink)}.osc .interactive{background-color:var(--color-surface-card);border:1px solid var(--color-hairline);border-radius:var(--radius-card);box-shadow:var(--shadow-raise);padding:26px;margin-top:22px}.osc .hint{font-size:var(--text-caps-sm);color:var(--color-ink-muted);font-weight:700;display:flex;gap:7px;margin-bottom:16px}.osc .btn,.osc .hint{font-family:var(--font-body);text-transform:uppercase;letter-spacing:var(--tracking-caps);align-items:center}.osc .btn{appearance:none;border:none;background-color:var(--color-surface-recessed);box-shadow:var(--shadow-blind);border-radius:var(--radius-chip);padding:12px 22px;font-weight:600;font-size:var(--text-caps);text-align:center;max-width:100%;cursor:pointer;display:inline-flex;justify-content:center;gap:9px;color:var(--color-slate);transition:color .3s,background-color .3s}.osc .btn:hover{color:var(--color-ink)}.osc 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