.article-meta[data-astro-cid-pu3vu6e3]{flex-direction:column;gap:10px;margin:22px 0 0;display:flex}.meta-line[data-astro-cid-pu3vu6e3]{color:var(--color-text-muted);font-family:var(--font-mono);letter-spacing:.025em;font-size:.7rem}.toc[data-astro-cid-p33bl5ka]{font-size:.88rem}.toc-title[data-astro-cid-p33bl5ka]{margin:0 0 13px}.toc[data-astro-cid-p33bl5ka] ul[data-astro-cid-p33bl5ka]{flex-direction:column;gap:9px;margin:0;padding:0;list-style:none;display:flex}.toc[data-astro-cid-p33bl5ka] li[data-astro-cid-p33bl5ka] a[data-astro-cid-p33bl5ka]{color:var(--color-text-muted);font-size:.78rem;line-height:1.4;display:block}.toc[data-astro-cid-p33bl5ka] li[data-astro-cid-p33bl5ka] a[data-astro-cid-p33bl5ka]:hover{color:var(--color-accent);text-decoration:none}.toc-sub[data-astro-cid-p33bl5ka]{padding-left:14px}.practice-shell[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border-strong);background:var(--color-bg-raised);width:min(100% - 48px,1080px);box-shadow:var(--shadow-card);border-radius:9px;margin:26px auto 0;overflow:hidden}.practice-header[data-astro-cid-jqawkiq2]{background:linear-gradient(#4764850f 1px,transparent 1px),linear-gradient(90deg,#4764850f 1px,transparent 1px),var(--color-bg-inset);background-size:22px 22px;justify-content:space-between;align-items:flex-start;gap:24px;padding:20px 22px;display:flex}.practice-kicker[data-astro-cid-jqawkiq2]{color:var(--color-accent);font-family:var(--font-mono);letter-spacing:.09em;align-items:center;gap:8px;font-size:.62rem;font-weight:750;display:flex}.practice-kicker[data-astro-cid-jqawkiq2] i[data-astro-cid-jqawkiq2]{background:var(--color-signal);width:7px;height:7px;box-shadow:0 0 0 4px color-mix(in srgb,var(--color-signal) 15%,transparent);border-radius:50%}h2[data-astro-cid-jqawkiq2]{font-family:var(--font-display);letter-spacing:-.025em;margin:9px 0 5px;font-size:1.28rem;line-height:1.25}.practice-header[data-astro-cid-jqawkiq2] p[data-astro-cid-jqawkiq2]{color:var(--color-text-muted);font-family:var(--font-mono);margin:0;font-size:.62rem}.practice-status[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border-strong);color:var(--color-text-muted);font-family:var(--font-mono);white-space:nowrap;border-radius:4px;padding:5px 7px;font-size:.56rem}button[data-astro-cid-jqawkiq2]{color:var(--color-text-muted);cursor:pointer;font-family:var(--font-mono);background:0 0;border:0;font-size:.65rem;font-weight:700}.practice-toolbar[data-astro-cid-jqawkiq2]{border-top:1px solid var(--color-border);grid-template-columns:minmax(0,1fr) auto;display:grid}.practice-controls[data-astro-cid-jqawkiq2]{grid-template-columns:repeat(4,1fr);display:grid}.practice-controls[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2]{border-right:1px solid var(--color-border);min-height:44px;padding:10px}.practice-controls[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2]:hover,.practice-controls[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2][aria-pressed=true]{background:var(--color-accent);color:var(--color-accent-contrast)}.session-controls[data-astro-cid-jqawkiq2]{align-items:center;gap:8px;padding:6px 10px;display:flex}.session-controls[data-astro-cid-jqawkiq2]>button[data-astro-cid-jqawkiq2],.timer[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border);border-radius:5px;padding:7px 9px}.timer[data-astro-cid-jqawkiq2]{align-items:center;gap:7px;display:flex}.timer[data-astro-cid-jqawkiq2]>span[data-astro-cid-jqawkiq2]{min-width:40px;color:var(--color-text);font-family:var(--font-mono);font-size:.66rem;font-weight:800}.timer[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2]{padding:0}.practice-deck[data-astro-cid-jqawkiq2]{border-top:1px solid var(--color-border);background:var(--color-bg-inset);grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;padding:18px;display:none}.practice-shell[data-astro-cid-jqawkiq2]:not([data-mode=read]) .practice-deck[data-astro-cid-jqawkiq2]{display:grid}.practice-question[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border);background:var(--color-bg-raised);border-radius:7px;padding:20px;position:relative}.practice-question[data-astro-cid-jqawkiq2].is-favorite{border-color:var(--color-signal)}.question-topline[data-astro-cid-jqawkiq2]{align-items:center;gap:9px;margin-bottom:18px;display:flex}.question-number[data-astro-cid-jqawkiq2],.question-topic[data-astro-cid-jqawkiq2]{color:var(--color-accent);font-family:var(--font-mono);font-size:.61rem;font-weight:750}.question-topic[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border);color:var(--color-text-muted);border-radius:999px;padding:3px 6px}.favorite[data-astro-cid-jqawkiq2]{color:var(--color-signal);margin-left:auto;padding:0;font-size:1.25rem;line-height:1}.practice-question[data-astro-cid-jqawkiq2] h3[data-astro-cid-jqawkiq2]{font-family:var(--font-display);letter-spacing:-.02em;margin:0;font-size:1.08rem;line-height:1.4}.reveal-controls[data-astro-cid-jqawkiq2]{gap:8px;margin-top:17px;display:flex}.reveal-controls[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border);border-radius:4px;padding:7px 9px}.reveal-controls[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2]:hover{border-color:var(--color-accent);color:var(--color-accent)}.practice-hint[data-astro-cid-jqawkiq2],.practice-answer[data-astro-cid-jqawkiq2]{border-top:1px solid var(--color-border);margin-top:15px;padding-top:13px;display:none}.practice-hint[data-astro-cid-jqawkiq2].is-open,.practice-answer[data-astro-cid-jqawkiq2].is-open,[data-astro-cid-jqawkiq2][data-mode=hints] .practice-hint[data-astro-cid-jqawkiq2],[data-astro-cid-jqawkiq2][data-mode=answers] .practice-hint[data-astro-cid-jqawkiq2],[data-astro-cid-jqawkiq2][data-mode=answers] .practice-answer[data-astro-cid-jqawkiq2]{display:block}.practice-hint[data-astro-cid-jqawkiq2]>span[data-astro-cid-jqawkiq2],.practice-answer[data-astro-cid-jqawkiq2]>span[data-astro-cid-jqawkiq2]{color:var(--color-signal);font-family:var(--font-mono);letter-spacing:.08em;font-size:.58rem;font-weight:750}.practice-answer[data-astro-cid-jqawkiq2]>span[data-astro-cid-jqawkiq2]{color:var(--color-accent)}.practice-hint[data-astro-cid-jqawkiq2] p[data-astro-cid-jqawkiq2],.practice-answer[data-astro-cid-jqawkiq2] p[data-astro-cid-jqawkiq2]{color:var(--color-text-muted);margin:6px 0 0;font-size:.86rem;line-height:1.6}.self-rating[data-astro-cid-jqawkiq2]{border-top:1px solid var(--color-border);flex-wrap:wrap;align-items:center;gap:6px;margin-top:18px;padding-top:13px;display:flex}.self-rating[data-astro-cid-jqawkiq2]>span[data-astro-cid-jqawkiq2]{color:var(--color-text-faint);font-family:var(--font-mono);margin-right:auto;font-size:.56rem}.self-rating[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border);border-radius:4px;padding:6px 8px}.self-rating[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2][aria-pressed=true]{border-color:var(--color-accent);background:color-mix(in srgb,var(--color-accent) 12%,transparent);color:var(--color-accent)}.practice-summary[data-astro-cid-jqawkiq2]{border-top:1px solid var(--color-border);background:var(--color-bg-inset);grid-template-columns:110px 130px minmax(0,1fr) auto;align-items:center;gap:16px;padding:18px 22px}.practice-summary[data-astro-cid-jqawkiq2]:not([hidden]){display:grid}.practice-summary[data-astro-cid-jqawkiq2] div[data-astro-cid-jqawkiq2]{flex-direction:column;gap:4px;display:flex}.practice-summary[data-astro-cid-jqawkiq2] span[data-astro-cid-jqawkiq2]{color:var(--color-text-faint);font-family:var(--font-mono);font-size:.55rem}.practice-summary[data-astro-cid-jqawkiq2] strong[data-astro-cid-jqawkiq2]{color:var(--color-text);font-family:var(--font-display);font-size:.88rem}.practice-summary[data-astro-cid-jqawkiq2] [data-astro-cid-jqawkiq2][data-score]{color:var(--color-accent);font-size:1.35rem}.practice-summary[data-astro-cid-jqawkiq2]>button[data-astro-cid-jqawkiq2]{border:1px solid var(--color-border);border-radius:4px;padding:8px 10px}.article-page.practice-active .article-body,.article-page.practice-active .article-footer{display:none}@media (width<=820px){.practice-toolbar[data-astro-cid-jqawkiq2]{grid-template-columns:1fr}.session-controls[data-astro-cid-jqawkiq2]{border-top:1px solid var(--color-border);justify-content:space-between}.practice-deck[data-astro-cid-jqawkiq2]{grid-template-columns:1fr}.practice-summary[data-astro-cid-jqawkiq2]{grid-template-columns:1fr 1fr}.weak-topics[data-astro-cid-jqawkiq2]{grid-column:1/-1}}@media (width<=560px){.practice-shell[data-astro-cid-jqawkiq2]{width:min(100% - 32px,1080px)}.practice-header[data-astro-cid-jqawkiq2]{flex-direction:column}.practice-controls[data-astro-cid-jqawkiq2]{grid-template-columns:1fr 1fr}.practice-controls[data-astro-cid-jqawkiq2] button[data-astro-cid-jqawkiq2]:nth-child(-n+2){border-bottom:1px solid var(--color-border)}.practice-summary[data-astro-cid-jqawkiq2]{grid-template-columns:1fr}.weak-topics[data-astro-cid-jqawkiq2]{grid-column:auto}}.article-actions[data-astro-cid-4oyofp65]{border:1px solid var(--color-border);background:var(--color-bg-inset);border-radius:8px;margin-bottom:28px;padding:22px}.article-actions[data-astro-cid-4oyofp65] h2[data-astro-cid-4oyofp65]{font-family:var(--font-display);letter-spacing:-.03em;margin:7px 0 16px;font-size:1.35rem}.action-buttons[data-astro-cid-4oyofp65]{flex-wrap:wrap;gap:8px;display:flex}.action-buttons[data-astro-cid-4oyofp65] a[data-astro-cid-4oyofp65],.action-buttons[data-astro-cid-4oyofp65] button[data-astro-cid-4oyofp65]{border:1px solid var(--color-border-strong);background:var(--color-bg-raised);color:var(--color-text);cursor:pointer;font-family:var(--font-mono);border-radius:5px;padding:9px 11px;font-size:.64rem;font-weight:700}.action-buttons[data-astro-cid-4oyofp65] a[data-astro-cid-4oyofp65]:hover,.action-buttons[data-astro-cid-4oyofp65] button[data-astro-cid-4oyofp65]:hover{border-color:var(--color-accent);color:var(--color-accent);text-decoration:none}.action-buttons[data-astro-cid-4oyofp65] .path-action[data-astro-cid-4oyofp65]{border-color:color-mix(in srgb,var(--color-accent) 55%,var(--color-border))}.copy-status[data-astro-cid-4oyofp65]{min-height:1em;color:var(--color-accent);font-family:var(--font-mono);margin:10px 0 0;font-size:.6rem}.article-header[data-astro-cid-sgg5joot]{max-width:980px;margin:0 auto;padding-block:46px 42px}.article-hero[data-astro-cid-sgg5joot]{border-bottom:1px solid var(--color-border);background:color-mix(in srgb, var(--color-bg-raised) 88%, transparent);position:relative;overflow:hidden}.article-hero[data-astro-cid-sgg5joot]:after{right:max(24px, calc((100vw - var(--wide-width)) / 2));border:1px solid var(--color-border);content:"";width:180px;height:180px;position:absolute;bottom:-50px;transform:rotate(45deg)}.back-link[data-astro-cid-sgg5joot]{z-index:1;color:var(--color-text-muted);font-family:var(--font-mono);letter-spacing:.08em;margin-bottom:34px;font-size:.64rem;display:inline-block;position:relative}.article-header[data-astro-cid-sgg5joot] h1[data-astro-cid-sgg5joot]{z-index:1;max-width:900px;font-family:var(--font-display);letter-spacing:-.055em;margin:10px 0 14px;font-size:clamp(2.5rem,6vw,5rem);line-height:.98;position:relative}.article-description[data-astro-cid-sgg5joot]{z-index:1;max-width:720px;color:var(--color-text-muted);margin:0;font-size:1.08rem;position:relative}.article-body[data-astro-cid-sgg5joot]{grid-template-columns:220px minmax(0, var(--content-width)) 100px;justify-content:center;gap:52px;margin-top:44px;display:grid}.article-toc[data-astro-cid-sgg5joot]{display:none}.toc-sticky[data-astro-cid-sgg5joot]{border-left:1px solid var(--color-border);padding:16px 0 16px 16px;position:sticky;top:96px}.article-footer[data-astro-cid-sgg5joot]{max-width:var(--content-width);border-top:1px solid var(--color-border);margin:64px auto 0;padding-top:28px}.prev-next[data-astro-cid-sgg5joot]{grid-template-columns:1fr 1fr;gap:16px;display:grid}.prev-next-link[data-astro-cid-sgg5joot]{border:1px solid var(--color-border);background:var(--color-bg-raised);color:var(--color-text);font-family:var(--font-display);border-radius:7px;flex-direction:column;gap:4px;padding:14px 16px;font-weight:700;display:flex}.prev-next-link[data-astro-cid-sgg5joot]:hover{border-color:var(--color-accent);text-decoration:none}.prev-next-link[data-astro-cid-sgg5joot].next{text-align:right;align-items:flex-end}.prev-next-link[data-astro-cid-sgg5joot].disabled{visibility:hidden}.related[data-astro-cid-sgg5joot]{margin-top:24px}.related[data-astro-cid-sgg5joot] ul[data-astro-cid-sgg5joot]{flex-direction:column;gap:6px;margin:10px 0 0;padding:0;list-style:none;display:flex}@media (width>=900px){.article-toc[data-astro-cid-sgg5joot]{display:block}}@media (width<=1120px){.article-body[data-astro-cid-sgg5joot]{grid-template-columns:200px minmax(0, var(--content-width))}}@media (width<=640px){.article-header[data-astro-cid-sgg5joot]{padding-block:34px}.article-hero[data-astro-cid-sgg5joot]:after{display:none}.article-body[data-astro-cid-sgg5joot]{margin-top:30px;display:block}.prev-next[data-astro-cid-sgg5joot]{grid-template-columns:1fr}.prev-next-link[data-astro-cid-sgg5joot].next{text-align:left;align-items:flex-start}}