:root{--page-bg:#f1f2f4;--page-fg:#16191d;--page-muted:#16191da8;--card-radius:20px;--mobile-width:420px;--card-column-width:min(calc(75dvh / 2), calc(100vw - 24px))}*{box-sizing:border-box}html,body{background:var(--page-bg);min-height:100%;color:var(--page-fg);-webkit-font-smoothing:antialiased;margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow:auto}.page{justify-content:center;align-items:center;height:100dvh;padding:12px;display:flex}.app-with-left-nav{min-height:100dvh}.mobile-nav-bar,.left-nav-backdrop{display:none}.left-nav{z-index:15;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#f8f8faeb;border-right:1px solid #16191d1a;flex-direction:column;gap:28px;width:232px;padding:28px 18px 20px;display:flex;position:fixed;inset:0 auto 0 0}.left-nav-brand{color:var(--page-fg);letter-spacing:-.03em;padding:0 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span{color:var(--page-fg);letter-spacing:-.03em;text-overflow:ellipsis;white-space:nowrap;font-size:1.18rem;font-weight:800;line-height:1.1;overflow:hidden}.mobile-nav-back{color:var(--page-muted);font-size:.78rem;font-weight:700;line-height:1.1;text-decoration:none}.left-nav-backdrop{z-index:29;cursor:pointer;background:#16191d47;border:0;display:block;position:fixed;inset:0}.left-nav{z-index:30;pointer-events:none;width:min(82vw,300px);transition:transform .18s;inset:0 auto 0 0;transform:translate(-105%);box-shadow:20px 0 44px #16191d2e}.left-nav-open{pointer-events:auto;transform:translate(0)}.left-nav-links{flex-direction:column}.left-nav-link{padding:11px 12px}.left-nav-account{border-top:1px solid #16191d1a;min-width:0;margin-top:auto;padding:12px 10px 0}.app-with-left-nav>.page{margin-left:0}.series-page-header{flex-direction:column;gap:14px}.series-page-header .series-title-stack{display:none}.primary-button.series-new-pack{margin-top:0}}.teachie-card .tc-shell{max-width:100%;margin:0 auto}.teachie-card .tc-card,.teachie-card .tc-quiz{background:0 0;border:none;border-radius:0;padding:0}.teachie-card .tc-quiz,.teachie-card .tc-shell.tc-flipped .tc-card{display:none}.teachie-card .tc-shell.tc-flipped .tc-quiz{display:block}.teachie-card .tc-eyebrow{color:var(--theme-primary);margin:0 0 6px;font-size:.78rem;font-weight:600}.teachie-card .tc-title{letter-spacing:-.3px;color:var(--theme-text);text-align:center;margin:0;font-family:Cormorant Garamond,Georgia,serif;font-size:22px;font-weight:600;line-height:1.15}.teachie-card .tc-summary{color:var(--theme-text);margin:0 0 8px;font-size:1.32rem;line-height:1.28}.teachie-card .tc-points{margin:0 0 8px;padding-left:18px;font-size:.84rem;line-height:1.28;display:none}.teachie-card .tc-point{margin:4px 0}.teachie-card .tc-footer{justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px;display:flex}.teachie-card .tc-tags{flex-wrap:wrap;gap:6px;display:flex}.teachie-card .tc-tag{border:1px solid color-mix(in srgb, var(--theme-primary) 20%, transparent);color:var(--theme-primary);border-radius:999px;padding:3px 8px;font-size:.78rem}.teachie-card .tc-time{color:var(--theme-primary);white-space:nowrap;font-size:.85rem;font-weight:600}.teachie-card .tc-quiz-btn,.teachie-card .tc-back-btn,.teachie-card .tc-choice{border:1px solid color-mix(in srgb, var(--theme-primary) 22%, transparent);font:inherit;cursor:pointer;border-radius:10px}.teachie-card .tc-quiz-btn,.teachie-card .tc-back-btn{background:var(--theme-primary);color:#fff;border-color:var(--theme-primary);padding:7px 11px;font-size:.85rem;font-weight:600}.teachie-card .tc-quiz-q{margin:0 0 10px;font-size:1.05rem;font-weight:600;line-height:1.25}.teachie-card .tc-choices{grid-template-columns:1fr;gap:8px;margin-bottom:10px;display:grid}.teachie-card .tc-choice{text-align:left;background:var(--theme-primary);color:#fff;border-color:var(--theme-primary);padding:8px 10px;font-size:.88rem}.teachie-card .tc-choice:disabled{cursor:default;opacity:.95}.teachie-card .tc-choice.tc-selected-correct,.teachie-card .tc-choice.tc-correct-reveal{color:#12351f;background:#e6f8ed;border-color:#3f9c63}.teachie-card .tc-choice.tc-selected-wrong{color:#3d1414;background:#fdeceb;border-color:#c05353}.teachie-card .tc-explain{margin:8px 0 14px;line-height:1.35}.teachie-card .tc-hidden{display:none}.teachie-card .teachie-quote{text-align:center;margin:0}.teachie-card blockquote{color:var(--theme-primary);margin:0 0 16px;font-size:1.35rem;font-weight:500;line-height:1.35}.teachie-card figcaption{color:var(--theme-secondary);font-size:1rem}