:root{--leaf: oklch(.36 .065 160);--leaf-deep: oklch(.23 .035 160);--rust: oklch(.49 .12 48);--canvas: oklch(.985 0 0);--sheet: oklch(1 0 0);--wash: oklch(.95 .014 160);--ink: oklch(.24 .018 160);--quiet: oklch(.46 .025 160);--line: oklch(.85 .017 160);--error: oklch(.44 .16 27);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Noto Sans SC", Arial, sans-serif;--radius: 12px;--shadow: 0 10px 32px oklch(.25 .02 160 / .08);--fast: .18s;--ease: cubic-bezier(.2, .7, .2, 1);--space: clamp(20px, 4vw, 52px)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--canvas);color:var(--ink);font:16px/1.75 var(--font)}a{color:var(--leaf);text-underline-offset:5px}a:hover{color:var(--rust)}button,input,select{font:inherit}button,a,input,select,summary{touch-action:manipulation}a,button,summary{transition:color var(--fast),background var(--fast),transform var(--fast)}:focus-visible{outline:3px solid var(--rust);outline-offset:4px}.book-width{width:min(1160px,100% - 2 * var(--space));margin-inline:auto}.book-mast{position:sticky;top:0;background:var(--sheet);z-index:3;border-bottom:1px solid var(--line)}.mast-inner{display:flex;align-items:center;justify-content:space-between;min-height:84px;gap:20px}.wordmark{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:600;text-decoration:none;color:var(--ink)}.book-menu summary{cursor:pointer;list-style:none;min-height:44px;padding:8px 14px;border:1px solid var(--line);border-radius:var(--radius)}.book-menu summary span{margin-left:18px}.book-menu nav{position:absolute;right:var(--space);top:75px;min-width:240px;padding:16px;background:var(--sheet);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius)}nav a{display:block;padding:8px 0}.skip-page{position:fixed;top:-80px;left:20px;z-index:6;background:var(--sheet);padding:8px}.skip-page:focus{top:8px}.opening{padding:58px 0 48px}.opening h1{font-size:clamp(32px,4.4vw,54px);line-height:1.25;letter-spacing:-.025em;font-weight:500;margin:0 0 20px;max-width:16ch;text-wrap:balance}.opening h1 span{display:block}.opening p{max-width:54ch;color:var(--quiet)}.opening-grid{display:grid;grid-template-columns:.85fr 1.4fr;gap:64px;align-items:start}.book-tab{display:inline-flex;gap:8px;align-items:center;color:var(--rust);margin-bottom:20px;font-size:14px}.leaf-work{background:var(--sheet);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}.leaf-work h2{font-size:21px;font-weight:600;margin:0 0 8px}.field-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}.leaf-work label{display:block;font-size:14px;font-weight:500;margin:16px 0 0}input,select{display:block;width:100%;min-width:0;padding:10px 12px;border:1px solid var(--line);border-radius:7px;background:var(--sheet);color:var(--ink);min-height:46px}input::placeholder{color:var(--quiet)}.leaf-action{border:0;background:var(--leaf);color:var(--sheet);border-radius:8px;padding:12px 20px;cursor:pointer;margin-top:22px;min-height:48px}.leaf-action:hover{background:var(--leaf-deep);transform:translateY(-1px)}.clear-leaf{background:none;color:var(--leaf);border:1px solid var(--line);margin-left:8px}.clear-leaf:hover{color:var(--sheet)}.local-note{font-size:12px!important;color:var(--quiet);margin:12px 0 0}.path-output{margin-top:24px;border-top:1px solid var(--line);padding-top:18px;scroll-margin-top:105px}.path-output h3{font-size:18px;margin:0 0 12px}.path-output ul{padding-left:20px}.error-text{color:var(--error)}.map-section{background:var(--wash);padding:48px 0}.map-section h2,.margin-section h2{font-size:28px;font-weight:500;margin:0 0 18px}.route-map{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:28px;border-top:1px solid var(--line)}.route-map article{padding:26px 24px 4px 0}.route-map h3{font-size:20px;font-weight:500;margin:0 0 12px}.route-map p{font-size:14px;color:var(--quiet)}.route-dot{display:block;background:var(--leaf);width:10px;height:10px;border-radius:50%;margin-top:-31px;margin-bottom:26px}.margin-section{padding:52px 0}.margin-layout{display:grid;grid-template-columns:1fr 2fr;gap:64px}.margin-layout dl{margin:0}.margin-layout dt{font-weight:600}.margin-layout dd{margin:6px 0 24px;color:var(--quiet)}.book-end{background:var(--leaf-deep);color:var(--sheet);padding:40px 0}.book-end a{color:var(--sheet)}.end-grid{display:grid;grid-template-columns:2fr 1fr;gap:20px}.end-grid p{margin:8px 0}.end-year{grid-column:1/-1;font-size:12px;opacity:.85}.book-prose{max-width:720px;padding:48px 0 64px;min-height:55vh}.book-prose h1{font-size:36px;font-weight:500;line-height:1.3}.book-prose h2{font-size:24px;margin-top:32px;font-weight:500}.book-prose p{margin:18px 0}.book-prose li{margin:8px 0}.book-prose table{border-collapse:collapse;width:100%}.book-prose td,.book-prose th{padding:12px;border:1px solid var(--line);text-align:left}.book-prose blockquote{margin:24px 0;padding:18px;background:var(--wash);border-radius:var(--radius)}.source-item{padding-block:20px;border-bottom:1px solid var(--line)}small{font-size:13px}noscript{display:block;padding:12px;background:var(--wash)}[hidden]{display:none!important}@media(min-width:900px){.book-menu{display:flex;align-items:center}.book-menu summary{display:none}.book-menu nav{position:static;display:flex;gap:24px;border:0;box-shadow:none;background:none;padding:0}.book-menu:not([open]) nav{display:flex}}@media(max-width:820px){.opening-grid,.margin-layout{grid-template-columns:1fr;gap:28px}.opening{padding-top:32px}.opening h1{font-size:34px;max-width:100%}.opening p{margin-bottom:0}.route-map{grid-template-columns:1fr 1fr;row-gap:28px}.leaf-work{padding:22px}.end-grid{grid-template-columns:1fr}.route-map article:nth-child(n+3) .route-dot{margin-top:0}.book-prose h1{font-size:29px}}@media(max-width:420px){.field-pair{grid-template-columns:1fr;gap:0}.wordmark{font-size:18px;gap:8px}.route-map{grid-template-columns:1fr}.route-map article:nth-child(n+2) .route-dot{margin-top:0}.mast-inner{min-height:72px}.book-menu nav{top:66px;max-width:calc(100vw - 40px)}.leaf-action{width:100%}.clear-leaf{margin-left:0;margin-top:10px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}