/* 2026-10-23：备案站独立阅读样式，提取现站4.2.1品牌配色。
 * 布局变化4 / 动效1 / 密度4。系统字体，不分发既有商业字体。
 * 页面背景0、正文1、键盘跳转2；无固定浮层。 */
:root{color-scheme:light dark;--bg:#f3f7fa;--surface:#fcfefe;--soft:#e9f1f5;--text:#263e4b;--muted:#526b78;--line:#c4d8e2;--accent:#216b80;--human:#22766f;--agent:#a04f79;--relation:#356daf;--focus:#1b6d8c;--display:"Songti SC","STSong","SimSun",serif;--body:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;min-height:100dvh;background:radial-gradient(ellipse at 95% 5%,#e4eff5,transparent 40%),var(--bg);color:var(--text);font:17px/1.9 var(--body);-webkit-font-smoothing:antialiased}a{color:var(--accent);text-underline-offset:.3em}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:5px}p{margin:0 0 1.2em;overflow-wrap:anywhere}h1,h2,h3{line-height:1.4;margin:0 0 .8em;font-weight:500;font-family:var(--display)}h1{font-size:clamp(32px,4.3vw,54px);letter-spacing:.01em}h2{font-size:clamp(26px,3vw,34px)}h3{font-size:23px}.wrap{width:min(1160px,calc(100% - 80px));margin-inline:auto}.skip{position:absolute;left:20px;top:-100px;z-index:2;padding:10px 16px;background:var(--surface)}.skip:focus{top:8px}.site-header{min-height:76px;display:flex;justify-content:space-between;gap:28px;align-items:center;border-bottom:1px solid var(--line)}.brand{text-decoration:none;color:var(--text);display:flex;gap:14px;align-items:center;white-space:nowrap}.brand strong{font-family:Georgia,serif;font-weight:400;font-size:32px;letter-spacing:.035em}.brand span{font-size:14px}.site-nav{display:flex;gap:26px;align-items:center;font-size:15px}.site-nav a{display:flex;align-items:center;min-height:44px;text-decoration:none}.site-nav a[aria-current=page]{text-decoration:underline}.hero{min-height:490px;position:relative;display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:28px;padding:58px 0 40px}.hero-copy{position:relative;z-index:1}.english{font-size:14px;color:var(--accent);letter-spacing:.05em}.lead{max-width:38em;color:var(--muted);font-size:18px}.hero-visual{width:100%;aspect-ratio:1;object-fit:contain;mix-blend-mode:multiply}.hero h1{max-width:12em}.reading-link{display:inline-flex;align-items:center;min-height:44px;margin-top:8px;font-size:16px;font-weight:600}.section{padding:54px 0}.section-heading{max-width:730px;margin-bottom:28px}.section-heading p{color:var(--muted)}.theme-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.theme-item{--group:var(--relation);padding:26px 24px 28px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}[data-group=human]{--group:var(--human)}[data-group=agent]{--group:var(--agent)}[data-group=relation]{--group:var(--relation)}.theme-title{display:flex;align-items:baseline;gap:15px;margin-bottom:18px;color:var(--group)}.theme-title strong{font:500 37px/1.3 var(--display)}.theme-title span{font-size:16px}.theme-item p{font-size:16px;color:var(--muted)}.theme-item a{color:var(--group)}.reading-note{max-width:760px;margin:30px 0 0;color:var(--muted);font-size:15px}.about-strip{display:grid;grid-template-columns:1fr 1.65fr;gap:70px;border-top:1px solid var(--line);margin-top:20px}.about-strip p{color:var(--muted)}.page-heading{padding:54px 0 18px;max-width:820px}.breadcrumb{font-size:14px;color:var(--muted);margin-bottom:28px}.prose{max-width:780px;padding:12px 0 40px}.prose section{margin:32px 0 45px}.prose h2{font-size:29px}.topic-list{display:grid;grid-template-columns:1fr 1fr;gap:0 48px;padding:0 0 45px}.topic{padding:28px 0;border-top:1px solid var(--line);scroll-margin-top:28px}.topic h2{font:600 20px/1.5 var(--body);color:var(--group);margin-bottom:12px}.topic p{margin:0;color:var(--muted)}.other-themes{border-top:1px solid var(--line);padding:24px 0 40px;display:flex;gap:24px;flex-wrap:wrap;font-size:16px}.site-footer{border-top:1px solid var(--line);padding:30px 0 32px;text-align:center;font-size:14px;color:var(--muted)}.site-footer p{margin:0 0 4px}.site-footer a{color:inherit;display:inline-flex;align-items:center;min-height:44px}.preview-notice{padding:10px 20px;background:var(--soft);color:var(--text);font-size:13px;text-align:center;border-bottom:1px solid var(--line)}.icp-pending{font-weight:600}.error-page{padding-bottom:70px;min-height:65vh}
/* 2026-10-23 preview2：目视发现img高度属性未被重置，修复首屏大段留白；渐隐边缘承接现站Logo用法。 */
.hero-visual{height:auto;mask-image:radial-gradient(ellipse at center,#000 45%,transparent 74%);-webkit-mask-image:radial-gradient(ellipse at center,#000 45%,transparent 74%)}
@media(prefers-color-scheme:dark){:root{--bg:#102332;--surface:#183344;--soft:#1c3b4d;--text:#e5f0f5;--muted:#aec7d3;--line:#3c6074;--accent:#96d8e0;--human:#8ed7ca;--agent:#e5b0ce;--relation:#a1c5f2;--focus:#b0e1ec}body{background:radial-gradient(ellipse at 95% 5%,#1a3c50,transparent 40%),var(--bg)}.hero-visual{mix-blend-mode:screen;filter:grayscale(1) invert(1) brightness(2.5);opacity:.64}}
@media(max-width:900px){.wrap{width:calc(100% - 48px)}.brand span{display:none}.hero{min-height:430px;gap:12px}.theme-list{gap:14px}.theme-item{padding:22px 18px}.about-strip{gap:38px}}
@media(max-width:767px){body{font-size:16px}.wrap{width:calc(100% - 36px)}.site-header{min-height:72px;gap:14px}.brand strong{font-size:28px}.site-nav{gap:16px;font-size:14px}.hero{grid-template-columns:1fr;gap:0;min-height:0;padding:42px 0 16px}.hero h1{font-size:36px;max-width:10em}.hero-visual{width:min(290px,80%);justify-self:end;margin-top:-24px;margin-bottom:-12px;opacity:.9}.hero .lead{font-size:17px}.section{padding:32px 0}.theme-list,.topic-list{grid-template-columns:1fr}.theme-item{padding:24px}.theme-item p{min-height:0}.about-strip{grid-template-columns:1fr;gap:4px;margin-top:28px}.page-heading{padding-top:36px}.page-heading h1{font-size:34px}.topic{padding:24px 0}.prose h2{font-size:26px}.site-footer{font-size:13px}.preview-notice{text-align:left;padding-inline:18px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}