:root{color-scheme:light;--page:#fff;--ink:#233a31;--muted:#657169;--line:#dce3dc;--soft:#f3f6f1;--reading-size:19px}*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--page);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8}a{color:inherit;text-underline-offset:4px;overflow-wrap:anywhere}a:hover{text-decoration-thickness:2px}button,input,textarea,select{font:inherit}button,a,input,textarea,select,summary{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #aa7b3c;outline-offset:4px}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:12px;z-index:10;background:var(--page);padding:10px}.topbar{position:sticky;top:0;z-index:3;background:var(--page);border-bottom:1px solid var(--line)}.topbar-inner{max-width:1180px;margin:auto;min-height:64px;padding:10px 24px;display:flex;gap:16px;justify-content:space-between;align-items:center}.brand{text-decoration:none;font-weight:650;letter-spacing:.08em}.settings{display:flex;gap:6px;align-items:center}.settings button{min-width:44px;min-height:44px;border:1px solid var(--line);border-radius:4px;background:var(--page);color:var(--ink);cursor:pointer}.layout{max-width:1180px;margin:36px auto 72px;padding:0 24px;display:grid;grid-template-columns:260px minmax(0,1fr);gap:56px}.contents{align-self:start;position:sticky;top:100px;max-height:calc(100vh - 120px);overflow:auto;padding-right:14px}.contents summary{font-weight:650;font-size:18px;cursor:pointer;padding:8px 0}.contents ol{margin:0;padding:8px 0 0 24px}.contents li{margin:0}.contents a{display:block;padding:9px 8px;text-decoration:none;font-size:14px;line-height:1.65}.contents a[aria-current=page]{background:var(--soft);border-radius:4px;font-weight:650}.reading-main{min-width:0;max-width:740px}.eyebrow,.meta{font-size:14px;color:var(--muted)}.reader-content{font-size:var(--reading-size);line-height:1.95;overflow-wrap:break-word}.reader-content h1,.hero h1{font-size:clamp(28px,4.8vw,40px);line-height:1.55;letter-spacing:-.025em;margin:12px 0 32px}.reader-content h2{font-size:1.22em;line-height:1.6;margin:2em 0 .8em}.reader-content h3{font-size:1.08em;line-height:1.6;margin:1.7em 0 .6em}.reader-content p{margin:0 0 1em}.reader-content ul,.reader-content ol{padding-left:1.6em}.reader-content li{margin:.4em 0}.reader-content blockquote{margin:1.4em 0;padding-left:1em;border-left:3px solid var(--ink)}.reader-content table{width:100%;min-width:28rem;border-collapse:collapse;font-size:.9em;line-height:1.75}.reader-content th,.reader-content td{border:1px solid var(--line);padding:10px;vertical-align:top}.table-scroll{overflow-x:auto;margin:1.2em 0;overscroll-behavior-x:contain}.chapter-nav{display:flex;justify-content:space-between;gap:18px;margin:44px 0 24px;padding-top:24px;border-top:1px solid var(--line)}.chapter-nav a{max-width:47%;text-decoration:none;font-size:15px}.chapter-nav a:last-child{text-align:right}.chapter-nav small{display:block;font-size:12px;color:var(--muted)}.feedback-entry{margin:36px 0;padding:24px;background:var(--soft);border:1px solid var(--line);border-radius:4px}.feedback-entry h2{font-size:20px;margin:0 0 10px}.feedback-entry p{font-size:15px;margin:0 0 16px}.actions{display:flex;gap:12px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:11px 18px;border:1px solid var(--ink);border-radius:4px;text-decoration:none;cursor:pointer;color:var(--ink);background:transparent;font-size:16px}.button.primary{color:var(--page);background:var(--ink)}.button:disabled{opacity:.55;cursor:wait}.small{font-size:13px;color:var(--muted);line-height:1.8}.book-index,.feedback-page{max-width:820px;margin:48px auto 80px;padding:0 24px}.hero{padding:28px 0 38px}.hero h1{font-size:48px;margin:12px 0}.hero .subtitle{font-size:20px;margin:0 0 20px}.toc-list{padding-left:26px}.toc-list li{border-bottom:1px solid var(--line);padding:15px 0}.toc-list a{text-decoration:none;display:block}.page-footer{margin-top:48px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.feedback-page h1{font-size:36px;line-height:1.4}.feedback-form{margin:32px 0}.field{margin:0 0 22px}.field label,.field-label{display:block;margin-bottom:8px;font-weight:600}.field input,.field textarea,.field select{display:block;width:100%;max-width:100%;border:1px solid var(--line);border-radius:4px;background:var(--page);color:var(--ink);padding:12px;font-size:16px}.field textarea{resize:vertical;min-height:180px}.field small{display:block;margin-top:6px;color:var(--muted);font-size:13px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}.consent{display:flex;align-items:flex-start;gap:10px;font-size:15px;margin:0 0 24px}.consent input{margin:6px 0 0;width:18px;height:18px;flex-shrink:0}.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.status{padding:14px 16px;background:var(--soft);border-radius:4px;margin:18px 0;white-space:pre-wrap}.comments{border-top:1px solid var(--line);margin-top:44px;padding-top:28px}.comment{border-bottom:1px solid var(--line);padding:20px 0}.comment blockquote{margin:12px 0;white-space:pre-wrap;overflow-wrap:anywhere}.comment .reply{border-left:3px solid var(--line);padding-left:16px;white-space:pre-wrap}.comment h3{font-size:17px;margin:0}.feedback-page .back-link{font-size:14px}.reading-progress{background:var(--soft);padding:14px 18px;border-radius:4px}.mail-fallback{margin-top:16px}.private-note{font-size:14px;color:var(--muted)}
.book-index{font-size:var(--reading-size)}
.brand-group{min-width:0}.all-books{display:block;font-size:12px;color:var(--muted);text-decoration:none}.brand-group .brand{display:block;font-size:15px;letter-spacing:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.settings{flex-shrink:0}.article-book .hero h1{font-size:clamp(28px,4.8vw,40px);line-height:1.55}.reader-content h4{font-size:1em;line-height:1.6;margin:1.5em 0 .6em}.reader-content .note{margin-top:2em;padding:1em;border:1px solid var(--line);background:var(--soft);font-size:.9em}
:root[data-theme=dark]{color-scheme:dark;--page:#151b17;--ink:#e1e9e0;--muted:#aab5a9;--line:#364238;--soft:#222d24}
@media(max-width:780px){.topbar-inner{padding:8px 18px;gap:8px}.layout{display:block;margin-top:18px;padding:0 20px}.contents{position:static;max-height:none;padding:0;margin-bottom:28px;border-bottom:1px solid var(--line)}.contents[open]{max-height:52vh;overflow:auto}.contents summary{padding:12px 0}.reading-main{max-width:none}.reader-content{font-size:var(--reading-size)}.reader-content h1{margin-top:10px}.feedback-entry{padding:20px}.book-index,.feedback-page{margin-top:28px;padding:0 20px}.hero h1{font-size:40px}.form-row{display:block}.chapter-nav{gap:12px}.chapter-nav a{font-size:14px}.feedback-page h1{font-size:30px}.settings button{font-size:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.topbar,.contents,.chapter-nav,.feedback-entry,.settings,.skip{display:none!important}.layout{display:block;margin:0;padding:0}.reader-content{font-size:11pt}.table-scroll{overflow:visible}.reader-content table{min-width:0}body{background:#fff;color:#000}}