._back-link_1s5f8_1{display:inline-grid;width:44px;height:44px;place-items:center;border-radius:50%;color:var(--color-ink);text-decoration:none;transition:background-color var(--duration-fast) var(--ease-soft),transform var(--duration-fast) var(--ease-soft)}._back-link_1s5f8_1 svg{width:28px;height:28px;overflow:visible}._back-link_1s5f8_1 path{fill:none;stroke:currentColor;stroke-width:3.2;stroke-linecap:round;stroke-linejoin:round}._back-link_1s5f8_1:hover{transform:translate(-2px);background:var(--color-mist)}._back-link_1s5f8_1:active{transform:translate(-1px)}@media(prefers-reduced-motion:reduce){._back-link_1s5f8_1{transition:none}}._toc-tree_1tzm3_1{display:grid;gap:2px;margin:0;padding:0;list-style:none}._toc-item_1tzm3_9,._toc-row_1tzm3_10{min-width:0}._toc-row_1tzm3_10{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:4px}._toc-link_1tzm3_21{position:relative;display:block;min-width:0;border-radius:6px;padding:8px 10px 8px 12px;color:var(--color-muted);line-height:1.45;text-decoration:none;transition:background-color var(--duration-fast) var(--ease-soft),color var(--duration-fast) var(--ease-soft)}._toc-link_1tzm3_21:before{position:absolute;top:50%;left:3px;width:3px;height:22px;transform:translateY(-50%) scaleY(.55);border-radius:var(--radius-pill);background:var(--color-ink);opacity:0;content:"";transition:opacity var(--duration-fast) var(--ease-soft),transform var(--duration-fast) var(--ease-soft)}._toc-depth-2_1tzm3_51{color:var(--color-ink);font-size:14px;font-weight:650}._toc-depth-3_1tzm3_57{margin-left:16px;border-left:1px solid var(--color-line);border-radius:0 6px 6px 0;font-size:13px;font-weight:500}._toc-depth-4_1tzm3_65{margin-left:32px;border-left:1px solid var(--color-line);border-radius:0 6px 6px 0;color:var(--color-faint);font-size:12.5px;font-weight:400}._toc-link_1tzm3_21:hover,._toc-link_1tzm3_21:focus-visible,._toc-link_1tzm3_21[aria-current=location]{background:var(--color-mist);color:var(--color-ink)}._toc-link_1tzm3_21[aria-current=location]:before{opacity:1;transform:translateY(-50%) scaleY(1)}._toc-item_1tzm3_9[data-current-branch]>._toc-row_1tzm3_10 ._toc-depth-2_1tzm3_51{background:color-mix(in srgb,var(--color-mist) 62%,transparent);color:var(--color-ink)}._toc-text_1tzm3_91{display:-webkit-box;min-width:0;overflow:hidden;overflow-wrap:anywhere;-webkit-box-orient:vertical;-webkit-line-clamp:2}._toc-link_1tzm3_21:hover ._toc-text_1tzm3_91,._toc-link_1tzm3_21:focus-visible ._toc-text_1tzm3_91{display:block;overflow:visible;-webkit-line-clamp:unset}._toc-branch-toggle_1tzm3_107{display:inline-grid;width:44px;height:44px;place-items:center;border:0;border-radius:6px;padding:0;background:transparent;color:var(--color-ink);font:inherit;cursor:pointer;transition:background-color var(--duration-fast) var(--ease-soft),color var(--duration-fast) var(--ease-soft)}._toc-branch-toggle_1tzm3_107:hover,._toc-branch-toggle_1tzm3_107:focus-visible{background:var(--color-mist);color:var(--color-ink)}._toc-branch-chevron_1tzm3_130{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;transform:rotate(0);transform-origin:center;transition:transform var(--duration-normal) var(--ease-soft)}._toc-branch-toggle_1tzm3_107[aria-expanded=false] ._toc-branch-chevron_1tzm3_130{transform:rotate(180deg)}._toc-children_1tzm3_147[hidden]{display:none}@media(prefers-reduced-motion:reduce){._toc-link_1tzm3_21,._toc-branch-toggle_1tzm3_107,._toc-branch-chevron_1tzm3_130{transition:none}}.article-body :where(h2,h3,h4)[id]{scroll-margin-top:104px}._reading-tools_1vni0_5{--reading-surface: var(--color-paper);--reading-shadow: 0 18px 48px rgb(0 0 0 / 8%), 0 4px 16px rgb(0 0 0 / 4%);position:relative;z-index:12;height:0;pointer-events:none}._toc-panel_1vni0_17{display:none}._toc-panel_1vni0_17 h2,._toc-drawer_1vni0_22 h2{margin:0;font-size:20px;line-height:1.2}._toc-panel-head_1vni0_28,._toc-drawer-head_1vni0_29{display:flex;flex:0 0 auto;align-items:center;justify-content:space-between;gap:var(--space-4);border-bottom:1px solid var(--color-line);padding:var(--space-5)}._toc-scroll_1vni0_39{min-height:0;overflow:auto;overscroll-behavior:contain;padding:var(--space-3);scrollbar-gutter:stable}._toc-toggle_1vni0_47,._back-to-top_1vni0_48,._toc-close_1vni0_49{display:inline-flex;min-width:48px;min-height:48px;align-items:center;justify-content:center;border:1px solid var(--color-line);border-radius:var(--radius-pill);background:var(--reading-surface);box-shadow:0 12px 28px #00000012,0 2px 8px #0000000a;color:var(--color-ink);cursor:pointer;pointer-events:auto;transition:bottom var(--duration-normal) var(--ease-soft),transform var(--duration-fast) var(--ease-soft),background-color var(--duration-fast) var(--ease-soft),border-color var(--duration-fast) var(--ease-soft),box-shadow var(--duration-fast) var(--ease-soft),opacity var(--duration-fast) var(--ease-soft)}._toc-toggle_1vni0_47{position:fixed;right:var(--space-page-x);bottom:var(--space-5);padding:0 16px;font-size:14px;font-weight:700}._reading-tools_1vni0_5[data-show-top] ._toc-toggle_1vni0_47{bottom:calc(var(--space-5) + 64px)}._back-to-top_1vni0_48{position:fixed;right:var(--space-page-x);bottom:var(--space-5);width:52px;height:52px;padding:0;line-height:1;opacity:0;transform:translateY(12px) scale(.82);pointer-events:none;transition:opacity var(--duration-normal) var(--ease-soft),transform var(--duration-normal) var(--ease-soft),background-color var(--duration-fast) var(--ease-soft),border-color var(--duration-fast) var(--ease-soft),box-shadow var(--duration-fast) var(--ease-soft)}._back-to-top_1vni0_48 svg{width:25px;height:25px;overflow:visible}._back-to-top_1vni0_48 path{fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}._reading-tools_1vni0_5[data-show-top] ._back-to-top_1vni0_48{opacity:1;transform:translateY(0) scale(1);pointer-events:auto}._toc-toggle_1vni0_47:hover,._back-to-top_1vni0_48:hover,._toc-close_1vni0_49:hover{border-color:var(--color-ink);background:var(--color-mist);transform:translateY(-1px)}._toc-drawer_1vni0_22{position:fixed;inset:auto var(--space-page-x) calc(var(--space-5) + 72px) auto;width:min(360px,calc(100vw - var(--space-page-x) * 2));max-width:none;max-height:min(68vh,560px);overflow:hidden;border:1px solid var(--color-line);border-radius:var(--radius-card);padding:0;margin:0;background:var(--reading-surface);box-shadow:var(--reading-shadow);color:var(--color-ink);opacity:0;transform:translateY(8px);pointer-events:auto;transition:opacity var(--duration-normal) var(--ease-soft),transform var(--duration-normal) var(--ease-soft)}._toc-drawer_1vni0_22[open]{opacity:1;transform:translateY(0)}._toc-drawer_1vni0_22::backdrop{background:#0b0b0b2e}._toc-drawer-shell_1vni0_164{display:grid;grid-template-rows:auto minmax(0,1fr);max-height:min(68vh,560px)}._toc-close_1vni0_49{min-width:44px;min-height:44px;padding:0;font-size:22px;line-height:1}@media(min-width:1536px){._toc-panel_1vni0_17{position:fixed;top:104px;right:var(--space-page-x);display:grid;width:320px;max-height:calc(100vh - 128px);grid-template-rows:auto minmax(0,1fr);overflow:hidden;border:1px solid var(--color-line);border-radius:var(--radius-card);background:var(--reading-surface);box-shadow:var(--reading-shadow);color:var(--color-ink);pointer-events:auto}._toc-toggle_1vni0_47,._toc-drawer_1vni0_22{display:none}}@media(max-width:520px){._toc-toggle_1vni0_47{right:var(--space-4);bottom:var(--space-4)}._reading-tools_1vni0_5[data-show-top] ._toc-toggle_1vni0_47{bottom:calc(var(--space-4) + 64px)}._back-to-top_1vni0_48{right:var(--space-4);bottom:var(--space-4)}._toc-drawer_1vni0_22{inset:auto var(--space-4) calc(var(--space-4) + 70px) auto;width:calc(100vw - var(--space-4) * 2);max-height:min(72vh,560px)}._toc-drawer-shell_1vni0_164{max-height:min(72vh,560px)}._toc-panel-head_1vni0_28,._toc-drawer-head_1vni0_29{padding:var(--space-4)}}@media(prefers-reduced-motion:reduce){._toc-toggle_1vni0_47,._back-to-top_1vni0_48,._toc-close_1vni0_49,._toc-drawer_1vni0_22{transition:none}}