:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#fff;--bg-soft:#f6f7f9;--bg-elevated:#fff;--bg-hover:#eef1f5;--text:#23272f;--text-muted:#5e687e;--text-subtle:#8a93a6;--border:#e4e7ec;--border-strong:#cfd5df;--accent:#0b7fa8;--accent-strong:#08668a;--accent-soft:#e6f4f9;--on-accent:#fff;--shadow:0 1px 2px #1018280f, 0 6px 20px -6px #1018281f;--junior:#23855a;--junior-soft:#e5f5ec;--middle:#b86e00;--middle-soft:#fdf1dc;--senior:#7a4fd6;--senior-soft:#f0eafd;--answer-bg:#eef7fb;--answer-border:#0b7fa8;--pitfall-bg:#fdf1ee;--pitfall-border:#d2553b;--pitfall-title:#b13f27;--follow-bg:#f3f0fb;--follow-border:#7a4fd6;--note-bg:#f6f7f9;--good:#23855a;--mid:#b86e00;--low:#c8432c;--code-bg:#f6f7f9;--code-text:#24292f;--code-comment:#6e7781;--code-punctuation:#57606a;--code-keyword:#b42b6f;--code-string:#1f7a3a;--code-number:#b35900;--code-function:#0a62b8;--code-tag:#0b6f8e;--code-attr:#8a4fd6;--inline-code-bg:#eef1f5;--radius:12px;--radius-sm:8px;--topbar-h:60px;--font:"Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#16181d;--bg-soft:#1d2027;--bg-elevated:#20242c;--bg-hover:#282c35;--text:#f2f4f7;--text-muted:#a5adbd;--text-subtle:#7c8496;--border:#2c313b;--border-strong:#3a404c;--accent:#4fc1e0;--accent-strong:#7dd3ea;--accent-soft:#163541;--on-accent:#0b1a20;--shadow:0 1px 2px #0000004d, 0 8px 24px -8px #00000080;--junior:#5cd394;--junior-soft:#173327;--middle:#f1b54a;--middle-soft:#382a12;--senior:#b39bff;--senior-soft:#2a2343;--answer-bg:#142c35;--answer-border:#4fc1e0;--pitfall-bg:#34201c;--pitfall-border:#ef7d63;--pitfall-title:#f4a08c;--follow-bg:#241f38;--follow-border:#b39bff;--note-bg:#1d2027;--good:#5cd394;--mid:#f1b54a;--low:#ef7d63;--code-bg:#1d2027;--code-text:#e6e9ef;--code-comment:#7d8799;--code-punctuation:#a5adbd;--code-keyword:#f286c4;--code-string:#a6e3a1;--code-number:#f5a97f;--code-function:#82c8ff;--code-tag:#79d4f0;--code-attr:#cdb6ff;--inline-code-bg:#262a33}}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#16181d;--bg-soft:#1d2027;--bg-elevated:#20242c;--bg-hover:#282c35;--text:#f2f4f7;--text-muted:#a5adbd;--text-subtle:#7c8496;--border:#2c313b;--border-strong:#3a404c;--accent:#4fc1e0;--accent-strong:#7dd3ea;--accent-soft:#163541;--on-accent:#0b1a20;--shadow:0 1px 2px #0000004d, 0 8px 24px -8px #00000080;--junior:#5cd394;--junior-soft:#173327;--middle:#f1b54a;--middle-soft:#382a12;--senior:#b39bff;--senior-soft:#2a2343;--answer-bg:#142c35;--answer-border:#4fc1e0;--pitfall-bg:#34201c;--pitfall-border:#ef7d63;--pitfall-title:#f4a08c;--follow-bg:#241f38;--follow-border:#b39bff;--note-bg:#1d2027;--good:#5cd394;--mid:#f1b54a;--low:#ef7d63;--code-bg:#1d2027;--code-text:#e6e9ef;--code-comment:#7d8799;--code-punctuation:#a5adbd;--code-keyword:#f286c4;--code-string:#a6e3a1;--code-number:#f5a97f;--code-function:#82c8ff;--code-tag:#79d4f0;--code-attr:#cdb6ff;--inline-code-bg:#262a33}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--topbar-h) + 16px)}body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.6}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}code,pre{font-variant-ligatures:none}code{font-family:var(--mono);background:var(--inline-code-bg);overflow-wrap:anywhere;border-radius:5px;padding:.1em .35em;font-size:.875em}kbd{font-family:var(--mono);border:1px solid var(--border-strong);color:var(--text-muted);background:var(--bg);border-bottom-width:2px;border-radius:5px;padding:1px 6px;font-size:.72rem;line-height:1.4}h1,h2,h3{letter-spacing:-.01em;line-height:1.25}.muted{color:var(--text-muted)}.skip-link{z-index:100;background:var(--accent);color:var(--on-accent);border-radius:var(--radius-sm);padding:8px 14px;position:absolute;top:-48px;left:12px}.skip-link:focus{top:10px}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 24px}.container--narrow{max-width:820px}.page{padding-top:40px;padding-bottom:64px}.app{flex-direction:column;min-height:100vh;display:flex}.main{flex:1}.btn{cursor:pointer;white-space:nowrap;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:8px;min-height:44px;padding:0 20px;font-size:.95rem;font-weight:600;transition:background .15s,border-color .15s,transform .1s;display:inline-flex;text-decoration:none!important}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn--primary{background:var(--accent);color:var(--on-accent)}.btn--primary:hover:not(:disabled){background:var(--accent-strong)}.btn--primary kbd{color:inherit;opacity:.7;background:0 0;border-color:currentColor}.btn--secondary{background:var(--bg);color:var(--text);border-color:var(--border-strong)}.btn--secondary:hover{border-color:var(--accent);color:var(--accent)}.link-btn{color:var(--accent);cursor:pointer;background:0 0;border:0;padding:0;font-weight:500}.link-btn:hover{text-decoration:underline}.icon-btn{width:40px;height:40px;color:var(--text-muted);cursor:pointer;background:0 0;border:0;border-radius:999px;place-items:center;display:inline-grid}.icon-btn:hover{background:var(--bg-hover);color:var(--text)}.topbar{z-index:50;height:var(--topbar-h);background:color-mix(in srgb, var(--bg) 88%, transparent);-webkit-backdrop-filter:saturate(1.6)blur(10px);backdrop-filter:saturate(1.6)blur(10px);border-bottom:1px solid var(--border);position:sticky;top:0}.topbar__inner{align-items:center;gap:16px;max-width:1440px;height:100%;margin:0 auto;padding:0 20px;display:flex}.brand{color:var(--text);flex-shrink:0;align-items:center;gap:10px;font-weight:700;display:flex;text-decoration:none!important}.brand__version{color:var(--text-muted);background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;padding:1px 8px;font-size:.72rem;font-weight:600}.search-trigger{background:var(--bg-soft);height:40px;color:var(--text-subtle);cursor:pointer;text-align:left;border:1px solid #0000;border-radius:999px;flex:0 300px;align-items:center;gap:10px;padding:0 12px;display:flex}.search-trigger span{flex:1}.search-trigger:hover{border-color:var(--border-strong)}.topnav{gap:4px;margin-left:auto;display:flex}.topnav__link{color:var(--text);border-radius:999px;padding:8px 14px;font-size:.95rem;font-weight:500;text-decoration:none!important}.topnav__link:hover{background:var(--bg-hover)}.topnav__link.active{color:var(--accent);background:var(--accent-soft)}.topbar__actions{align-items:center;gap:2px;display:flex}.menu-btn,.search-icon-btn{display:none}.search-dialog{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-elevated);width:min(640px,100vw - 32px);color:var(--text);box-shadow:var(--shadow);margin:10vh auto auto;padding:0}.search-dialog::backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0a0c1073}.search-dialog__field{border-bottom:1px solid var(--border);color:var(--text-subtle);align-items:center;gap:10px;padding:14px 16px;display:flex}.search-dialog__field input{color:var(--text);font:inherit;background:0 0;border:0;outline:0;flex:1;font-size:1.05rem}.search-dialog__results{max-height:60vh;margin:0;padding:8px;list-style:none;overflow:auto}.search-dialog__results li{border-radius:var(--radius-sm);cursor:pointer;align-items:center;gap:12px;padding:10px 12px;display:flex}.search-dialog__results li.is-active{background:var(--accent-soft)}.search-dialog__num{font-family:var(--mono);color:var(--text-subtle);min-width:26px;font-size:.8rem}.search-dialog__title{flex:1}.search-dialog__empty,.search-dialog__hint{color:var(--text-muted);margin:0;padding:12px 16px;cursor:default!important}.hero{text-align:center;background:radial-gradient(circle at 50% -20%, var(--accent-soft), transparent 60%), var(--bg);border-bottom:1px solid var(--border);padding:72px 24px 64px}.hero__logo{background:var(--bg-elevated);border:1px solid var(--border);width:112px;height:112px;box-shadow:var(--shadow);border-radius:28px;place-items:center;margin-bottom:24px;display:inline-grid}.hero__title{letter-spacing:-.03em;margin:0 0 12px;font-size:clamp(2.4rem,6vw,3.8rem);font-weight:800}.hero__subtitle{max-width:640px;color:var(--text-muted);margin:0 auto 28px;font-size:clamp(1.05rem,2.2vw,1.3rem)}.hero__actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.hero__search{color:var(--text-subtle);cursor:pointer;background:0 0;border:0;align-items:center;gap:8px;margin-top:20px;display:inline-flex}.hero__search:hover{color:var(--text)}.section{padding:64px 0}.section--alt{background:var(--bg-soft);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.section__title{margin:0 0 8px;font-size:1.8rem}.section__lead{color:var(--text-muted);max-width:680px;margin:0 0 28px}.grid{gap:20px;display:grid}.grid--3{grid-template-columns:repeat(3,1fr)}.card{border-radius:var(--radius);background:var(--bg-elevated);border:1px solid var(--border);color:var(--text);flex-direction:column;gap:10px;padding:24px;transition:border-color .15s,box-shadow .15s,transform .15s;display:flex;text-decoration:none!important}.card:hover{border-color:var(--border-strong);box-shadow:var(--shadow);transform:translateY(-2px)}.card p{color:var(--text-muted);margin:0}.card h3{margin:0;font-size:1.2rem}.card--level{border-top:4px solid var(--level-color)}.card--junior{--level-color:var(--junior)}.card--middle{--level-color:var(--middle)}.card--senior{--level-color:var(--senior)}.card__count{font-size:1.6rem;font-weight:700}.card__icon{background:var(--accent-soft);width:44px;height:44px;color:var(--accent);border-radius:12px;place-items:center;display:grid}.card__cta{color:var(--accent);align-items:center;gap:6px;margin-top:auto;font-weight:600;display:inline-flex}.topic-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;display:grid}.topic-card{border-radius:var(--radius);border:1px solid var(--border);color:var(--text);grid-template-columns:1fr auto;gap:2px 12px;padding:16px 18px;display:grid;text-decoration:none!important}.topic-card:hover{border-color:var(--accent)}.topic-card__title{font-weight:600}.topic-card__desc{color:var(--text-muted);grid-column:1;font-size:.85rem}.topic-card__count{color:var(--accent);grid-area:1/2/span 2;align-self:center;font-weight:700}.callout-wide{justify-content:space-between;align-items:center;gap:32px;display:flex}.callout-wide .section__lead{margin-bottom:0}.badge{letter-spacing:.02em;white-space:nowrap;vertical-align:middle;border-radius:999px;align-items:center;padding:2px 10px;font-size:.75rem;font-weight:700;display:inline-flex}.badge--junior{color:var(--junior);background:var(--junior-soft)}.badge--middle{color:var(--middle);background:var(--middle-soft)}.badge--senior{color:var(--senior);background:var(--senior-soft)}.topic-tag{color:var(--text-muted);background:var(--bg-soft);border:1px solid var(--border);white-space:nowrap;border-radius:999px;padding:2px 10px;font-size:.78rem;display:inline-block}.topic-tag--link:hover{color:var(--accent);border-color:var(--accent);text-decoration:none}.docs{grid-template-columns:280px minmax(0,1fr);max-width:1440px;margin:0 auto;display:grid}.sidebar{top:var(--topbar-h);height:calc(100vh - var(--topbar-h));border-right:1px solid var(--border);align-self:start;padding:24px 16px 40px;position:sticky;overflow-y:auto}.sidebar__group+.sidebar__group{margin-top:24px}.sidebar__heading{text-transform:uppercase;letter-spacing:.08em;color:var(--text-subtle);margin:0 0 8px 12px;font-size:.75rem}.sidebar__item{border-radius:var(--radius-sm);text-align:left;cursor:pointer;background:0 0;border:0;justify-content:space-between;width:100%;padding:7px 12px;font-size:.93rem;display:flex}.sidebar__item span{color:var(--text-subtle);font-size:.85rem}.sidebar__item:hover{background:var(--bg-hover)}.sidebar__item.is-active{background:var(--accent-soft);color:var(--accent);font-weight:600}.sidebar__list{margin:0;padding:0;list-style:none}.sidebar__link{border-radius:var(--radius-sm);color:var(--text);gap:10px;padding:6px 12px;font-size:.9rem;line-height:1.4;display:flex;text-decoration:none!important}.sidebar__link:hover{background:var(--bg-hover)}.sidebar__link.is-active{background:var(--accent-soft);color:var(--accent);font-weight:600}.sidebar__num{font-family:var(--mono);color:var(--text-subtle);min-width:22px;padding-top:1px;font-size:.78rem}.docs__content{width:100%;max-width:900px;padding:40px 48px 80px}.page-header h1{margin:0 0 10px;font-size:clamp(2rem,4vw,2.6rem);font-weight:800}.page-header__lead{color:var(--text-muted);margin:0 0 28px;font-size:1.08rem}.filters-mobile{gap:8px;margin-bottom:12px;display:none}.filters-mobile select{border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--bg);min-width:0;height:42px;color:var(--text);font:inherit;flex:1;padding:0 10px}.search-field{border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--bg);height:46px;color:var(--text-subtle);align-items:center;gap:10px;padding:0 14px;display:flex}.search-field:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.search-field input{min-width:0;color:var(--text);font:inherit;background:0 0;border:0;outline:0;flex:1}.results-count{color:var(--text-muted);align-items:center;gap:16px;margin:14px 0 8px;font-size:.9rem;display:flex}.question-group{margin-top:28px}.question-group__title{color:var(--text-muted);align-items:center;gap:12px;margin:0 0 8px;font-size:.95rem;font-weight:500;display:flex}.question-list{border:1px solid var(--border);border-radius:var(--radius);margin:0;padding:0;list-style:none;overflow:hidden}.question-list li+li{border-top:1px solid var(--border)}.question-row{color:var(--text);grid-template-columns:36px minmax(0,1fr) auto;align-items:start;gap:14px;padding:14px 18px;display:grid;text-decoration:none!important}.question-row:hover{background:var(--bg-soft)}.question-row__num{font-family:var(--mono);color:var(--text-subtle);padding-top:2px;font-size:.85rem}.question-row__body{flex-direction:column;gap:2px;min-width:0;display:flex}.question-row__title{font-weight:600}.question-row:hover .question-row__title{color:var(--accent)}.question-row__short{color:var(--text-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:.88rem;display:-webkit-box;overflow:hidden}.empty{text-align:center;color:var(--text-muted);padding:48px 0}.breadcrumbs{color:var(--text-subtle);flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:16px;font-size:.88rem;display:flex}.article__header h1{margin:8px 0 24px;font-size:clamp(1.8rem,4vw,2.5rem);font-weight:800}.article__meta{align-items:center;gap:10px;display:flex}.article__num{color:var(--text-subtle);font-size:.85rem}.article__section-title{margin:40px 0 12px;font-size:1.45rem}.article__train{margin-top:32px}.callout{border-radius:var(--radius);border-left:4px solid var(--callout-border);background:var(--callout-bg);margin:24px 0;padding:18px 22px}.callout p{margin:0}.callout ul{margin:0;padding-left:20px}.callout li+li{margin-top:6px}.callout__title{text-transform:uppercase;letter-spacing:.06em;color:var(--callout-title,var(--callout-border));align-items:center;gap:8px;margin:0 0 8px;font-size:.82rem;display:flex}.callout__more{margin-top:10px;font-size:.92rem;font-weight:500;display:inline-block}.callout--answer{--callout-bg:var(--answer-bg);--callout-border:var(--answer-border);font-size:1.05rem}.callout--pitfall{--callout-bg:var(--pitfall-bg);--callout-border:var(--pitfall-border);--callout-title:var(--pitfall-title)}.callout--follow{--callout-bg:var(--follow-bg);--callout-border:var(--follow-border)}.callout--note{--callout-bg:var(--note-bg);--callout-border:var(--border-strong);--callout-title:var(--text-muted)}.prose{font-size:1.02rem}.prose p,.prose ul,.prose ol{margin:0 0 16px}.prose ul,.prose ol{padding-left:22px}.prose li+li{margin-top:6px}.prose h2{margin:36px 0 12px;font-size:1.45rem}.prose h3{margin:28px 0 10px;font-size:1.15rem}.code-block{border-radius:var(--radius);background:var(--code-bg);border:1px solid var(--border);margin:20px 0;overflow:hidden}.code-block__bar{border-bottom:1px solid var(--border);color:var(--text-subtle);justify-content:space-between;align-items:center;padding:6px 8px 6px 16px;font-size:.78rem;font-weight:600;display:flex}.code-block__copy{color:var(--text-subtle);cursor:pointer;background:0 0;border:0;border-radius:6px;align-items:center;gap:6px;padding:4px 10px;font-size:.78rem;display:inline-flex}.code-block__copy:hover{background:var(--bg-hover);color:var(--text)}.code-block pre{font-family:var(--mono);tab-size:2;margin:0;padding:16px 18px;font-size:.86rem;line-height:1.65;overflow-x:auto}.table-wrap{border:1px solid var(--border);border-radius:var(--radius);margin:20px 0;overflow-x:auto}.table-wrap table{border-collapse:collapse;width:100%;font-size:.92rem}.table-wrap th,.table-wrap td{text-align:left;vertical-align:top;border-bottom:1px solid var(--border);padding:10px 14px}.table-wrap th{background:var(--bg-soft);font-weight:600}.table-wrap tr:last-child td{border-bottom:0}.links ul{gap:8px;margin:0;padding:0;list-style:none;display:grid}.links a{align-items:center;gap:8px;font-weight:500;display:inline-flex}.legacy-note{color:var(--text-muted);align-items:center;gap:8px;margin-top:32px;font-size:.9rem;display:flex}.pager{border-top:1px solid var(--border);grid-template-columns:1fr 1fr;gap:16px;margin-top:48px;padding-top:32px;display:grid}.pager__link{border-radius:var(--radius);border:1px solid var(--border);color:var(--text);flex-direction:column;gap:4px;padding:16px 20px;display:flex;text-decoration:none!important}.pager__link:hover{border-color:var(--accent)}.pager__link--next{text-align:right;grid-column:2;align-items:flex-end}.pager__label{color:var(--text-subtle);align-items:center;gap:6px;font-size:.82rem;display:inline-flex}.pager__title{color:var(--accent);font-weight:600}.setup{flex-direction:column;gap:24px;display:flex}.setup__group{border:0;min-width:0;margin:0;padding:0}.setup__group legend{margin-bottom:10px;padding:0;font-weight:700}.setup__hint{color:var(--text-subtle);margin:8px 0 0;font-size:.85rem}.setup__row{flex-wrap:wrap;gap:32px;display:flex}.setup__footer{border-top:1px solid var(--border);color:var(--text-muted);justify-content:space-between;align-items:center;gap:20px;padding-top:20px;display:flex}.chips{flex-wrap:wrap;gap:8px;display:flex}.chip{border:1px solid var(--border-strong);background:var(--bg);cursor:pointer;border-radius:999px;padding:7px 14px;font-size:.92rem}.chip:hover{border-color:var(--accent)}.chip.is-active{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}.segmented{background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;flex-wrap:wrap;gap:4px;padding:4px;display:inline-flex}.segmented button{cursor:pointer;color:var(--text-muted);background:0 0;border:0;border-radius:999px;padding:6px 16px;font-size:.92rem}.segmented button.is-active{background:var(--bg-elevated);color:var(--text);font-weight:600;box-shadow:0 1px 3px #0000001f}.option-cards{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.option-cards--2{grid-template-columns:repeat(2,1fr)}.option-card{border-radius:var(--radius);border:1px solid var(--border-strong);cursor:pointer;color:var(--text-muted);flex-direction:column;align-items:flex-start;gap:8px;padding:16px;font-size:.9rem;display:flex;position:relative}.option-card strong{color:var(--text);font-size:1rem}.option-card input{opacity:0;pointer-events:none;position:absolute}.option-card:has(input:focus-visible){outline:2px solid var(--accent);outline-offset:2px}.option-card.is-active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent);background:var(--accent-soft)}.session__top{color:var(--text-muted);justify-content:space-between;align-items:center;gap:12px;font-size:.92rem;display:flex}.session__top>span:first-child{align-items:center;gap:8px;display:inline-flex}.progress{background:var(--bg-soft);border-radius:999px;height:6px;margin:12px 0 28px;overflow:hidden}.progress__bar{background:var(--accent);border-radius:inherit;height:100%;transition:width .3s}.timer{font-family:var(--mono);color:var(--text);align-items:center;gap:6px;font-weight:500;display:inline-flex}.timer--warn{color:var(--mid)}.timer--expired{color:var(--low)}.flashcard{border:1px solid var(--border);background:var(--bg-elevated);box-shadow:var(--shadow);border-radius:16px;padding:32px}.flashcard__meta{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.flashcard__num{font-family:var(--mono);color:var(--text-subtle);font-size:.82rem}.flashcard__title{margin:14px 0 20px;font-size:clamp(1.4rem,3.4vw,1.9rem)}.flashcard__prompt 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