:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--chrono-bg,#f5f1e6);color:var(--chrono-text,#2d2820);font-synthesis:none;scroll-behavior:smooth}
*{box-sizing:border-box}
body{margin:0;line-height:1.75}
a{color:inherit;text-underline-offset:5px}
a:focus-visible,summary:focus-visible,button:focus-visible,select:focus-visible{outline:2px solid var(--chrono-gold);outline-offset:5px}
.skip-link{position:absolute;top:-100px;left:20px;z-index:5;background:var(--chrono-card);padding:12px}
.skip-link:focus{top:10px}
.site-header{max-width:1200px;margin:auto;padding:24px 40px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--chrono-border)}
.brand{text-decoration:none;font-size:15px;letter-spacing:2px;font-weight:600}
.back-link{font-size:14px;color:var(--chrono-muted);white-space:nowrap}
main{max-width:1120px;margin:auto;padding:0 40px}
.breadcrumb{display:flex;flex-wrap:wrap;gap:9px;margin:30px 0 40px;font-size:13px;color:var(--chrono-muted)}
.breadcrumb a{text-decoration:none}
.hero{display:grid;grid-template-columns:minmax(240px,330px) minmax(0,1fr);gap:clamp(40px,7vw,104px);align-items:center;padding-bottom:68px}
.cover{margin:0}
.cover img{display:block;width:100%;height:auto;box-shadow:0 18px 45px #0002;border:1px solid var(--chrono-border)}
.cover figcaption{margin-top:12px;font-size:12px;color:var(--chrono-muted);text-align:center;letter-spacing:2px}
.eyebrow{display:flex;align-items:center;flex-wrap:wrap;gap:12px;color:var(--chrono-muted);font-size:13px;letter-spacing:2px}
.pill{border:1px solid var(--chrono-border);padding:3px 10px;border-radius:4px;letter-spacing:1px;color:var(--chrono-gold)}
h1,h2,h3,.book-subtitle{font-family:"Songti SC","Noto Serif SC",SimSun,serif;font-weight:500}
h1{font-size:clamp(44px,5vw,64px);line-height:1.25;letter-spacing:5px;margin:22px 0 16px}
.book-subtitle{font-size:clamp(21px,2.4vw,28px);line-height:1.65;margin:0 0 24px}
.author{font-size:14px;color:var(--chrono-muted);letter-spacing:3px}
.hero-excerpt{font-size:17px;line-height:2;max-width:29em;margin:28px 0;color:var(--chrono-muted)}
.actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:16px;padding:11px 24px;min-height:48px;border:1px solid var(--chrono-border);border-radius:5px;text-decoration:none;font-size:15px}
.button-primary{background:var(--chrono-text);border-color:var(--chrono-text);color:var(--chrono-bg)}
.button:hover{border-color:var(--chrono-gold)}
.reading-nav{display:flex;justify-content:center;gap:34px;border-top:1px solid var(--chrono-border);border-bottom:1px solid var(--chrono-border);padding:15px 0;font-size:14px}
.reading-nav a{text-decoration:none}
.reading-section{padding:64px 0;scroll-margin-top:20px}
.section-heading{display:flex;align-items:baseline;gap:18px;margin-bottom:30px}
.section-heading .number{font-size:12px;letter-spacing:2px;color:var(--chrono-gold)}
.section-heading h2{font-size:30px;margin:0;letter-spacing:2px}
.section-note{font-size:14px;color:var(--chrono-muted);margin:-10px 0 28px;max-width:58em}
.preface{max-width:740px;margin:auto}
.preface h3{font-size:26px;line-height:1.6;margin:0 0 28px}
.prose{font-size:18px;line-height:2.1;overflow-wrap:anywhere}
.prose p{margin:0 0 1.35em}
.prose h4,.prose h5,.prose h6{font-family:"Songti SC",SimSun,serif;font-size:22px;line-height:1.7;margin:2em 0 1em}
.prose hr{border:0;border-top:1px solid var(--chrono-border);width:48px;margin:38px auto}
.prose blockquote{margin:28px 0;padding:4px 0 4px 24px;border-left:2px solid var(--chrono-gold);color:var(--chrono-muted)}
.prose blockquote p:last-child{margin-bottom:0}
.prose code{font-size:.88em;word-break:break-word;background:var(--chrono-soft);padding:2px 5px;border-radius:3px}
.prose table{width:100%;font-size:15px;border-collapse:collapse}
.prose th,.prose td{padding:10px;border:1px solid var(--chrono-border);text-align:left}
.prose ul,.prose ol{padding-left:1.5em}
.toc-section{border-top:1px solid var(--chrono-border)}
.toc{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:0 40px;align-items:start}
.toc>li{border-top:1px solid var(--chrono-border);padding:17px 0;min-width:0;font-size:16px;overflow-wrap:anywhere}
.toc summary{cursor:pointer;list-style:none;position:relative;padding-right:28px}
.toc summary::-webkit-details-marker{display:none}
.toc summary:after{content:"＋";position:absolute;right:0;top:0;color:var(--chrono-gold)}
.toc details[open]>summary:after{content:"−"}
.toc ol{list-style:none;padding:8px 0 0 18px;border-left:1px solid var(--chrono-border);margin:12px 0 0 2px;font-size:14px;color:var(--chrono-muted)}
.toc ol li{padding:6px 0}
.toc-tools{display:flex;flex-wrap:wrap;gap:18px;margin-bottom:20px}
.toc-tools button{font:inherit;font-size:13px;border:0;background:none;padding:5px 0;color:var(--chrono-muted);text-decoration:underline;text-underline-offset:5px;cursor:pointer}
.extra-toc{margin-top:36px}
.extra-toc>summary{cursor:pointer;font-size:16px;padding:15px 0;color:var(--chrono-gold)}
.source-note{border-top:1px solid var(--chrono-border);padding:28px 0;color:var(--chrono-muted);font-size:13px;line-height:1.9}
.source-note p{margin:6px 0}
.series{border-top:1px solid var(--chrono-border);padding:42px 0 56px}
.series h2{font-size:25px;letter-spacing:2px;margin:0 0 22px}
.series-links{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
.series-links a{padding:18px;border:1px solid var(--chrono-border);border-radius:5px;text-decoration:none;font-size:18px}
.series-links a[aria-current=page]{background:var(--chrono-soft)}
.series-links small{display:block;font-size:12px;color:var(--chrono-muted);margin-bottom:6px}
.site-footer{max-width:1040px;margin:auto;padding:24px 20px 12px;text-align:center;color:var(--chrono-muted);font-size:12px;letter-spacing:2px;border-top:1px solid var(--chrono-border)}
body .chrono-theme-control{position:static;display:flex;width:fit-content;margin:12px auto 36px;box-shadow:none}
#theme-slot .chrono-theme-control{margin:0;padding:5px 8px;font-size:12px;background:transparent}
@media(max-width:700px){.site-header{padding:18px 20px}.brand{font-size:12px;letter-spacing:1px}.back-link{font-size:12px}main{padding:0 24px}.breadcrumb{font-size:12px;margin:24px 0 30px}.hero{grid-template-columns:1fr;gap:32px;padding-bottom:42px}.cover{max-width:248px;margin:auto;width:100%}.hero-copy{text-align:center}.eyebrow,.actions{justify-content:center}h1{font-size:43px;margin-top:18px}.book-subtitle{font-size:22px}.hero-excerpt{font-size:16px;text-align:left;margin:22px auto}.actions{gap:10px}.button{padding:10px 20px}.reading-nav{gap:26px}.reading-section{padding:42px 0}.section-heading h2{font-size:26px}.preface h3{font-size:23px}.prose{font-size:17px;line-height:2}.prose h4,.prose h5,.prose h6{font-size:20px}.toc{grid-template-columns:1fr}.series-links{grid-template-columns:1fr 1fr;gap:12px}.series-links a{font-size:17px;padding:14px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}}
@media print{.site-header,.breadcrumb,.actions,.reading-nav,.toc-tools,.series,.chrono-theme-control,.skip-link{display:none!important}main{padding:0;max-width:none}.hero{gap:30px;grid-template-columns:160px 1fr}.cover img{box-shadow:none}.reading-section{padding:24px 0}.toc{display:block}.prose{font-size:12pt}details{break-inside:avoid}}