:root{--paper:#f8f7f2;--ink:#252b27;--muted:#62695f;--line:#d7dacf;--green:#355b40;--sans:'PingFang SC','Microsoft YaHei','Noto Sans CJK SC',sans-serif;--serif:'Songti SC','Noto Serif CJK SC','SimSun',serif;--mono:'Cascadia Code',Consolas,monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:32px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 var(--sans);text-rendering:optimizeLegibility}a{color:inherit;text-decoration:none}button,input,select{font:inherit;color:inherit}button,summary{cursor:pointer}a:hover,button:hover{color:var(--green)}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--green);outline-offset:4px}::selection{background:#dce6d6}.wrap,.top-inner,.footer{max-width:1120px;margin-left:auto;margin-right:auto}.topbar{border-bottom:1px solid var(--line)}.top-inner{min-height:84px;display:flex;align-items:center;gap:36px}.brand{font:26px 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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* Immersive study archive */
:root{--paper:#f7f8f8;--ink:#233441;--muted:#5a6b75;--line:#dce3e6;--green:#365e73;--gold:#d8b27b}
.wrap,.top-inner,.footer{max-width:1320px}.topbar{background:var(--paper);position:relative;z-index:30}.top-inner{min-height:82px}.brand{font:25px Georgia,serif;letter-spacing:-.7px}.brand-dot{color:#9c784b}.site-section{border-color:#b8c6ce;color:var(--muted);font-size:13px}nav{font-size:13px;gap:27px}.header-search{display:flex;align-items:center;gap:12px;background:transparent;border:1px solid #b6c4cc70;border-radius:5px;padding:8px 10px;color:inherit}.header-search svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:1.5}.header-search kbd{font:10px var(--mono)}.on-hero{position:absolute;inset:0 0 auto;background:transparent;color:#fff;border-bottom:1px solid #ffffff26}.on-hero .site-section,.on-hero nav{color:#f3f1e9}.on-hero .brand-dot{color:#f4ce90}.on-hero .site-section{border-color:#ffffff59}.on-hero a:hover,.on-hero button:hover{color:#ffdfab}
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.search-dialog{position:fixed;top:16vh;bottom:auto;width:min(620px,calc(100vw - 32px));max-height:70svh;padding:22px 25px;border:1px solid #c9d5dc;border-radius:8px;background:#f9fafb;color:var(--ink);box-shadow:0 30px 90px #102c4340}.search-dialog::backdrop{background:#11283a83;backdrop-filter:blur(5px)}.dialog-bar{display:flex;justify-content:space-between;align-items:center;font-size:13px}.dialog-bar button{font:10px var(--mono);border:1px solid var(--line);background:none;padding:4px 7px;border-radius:3px}.search-dialog>input{border:0;border-bottom:1px solid var(--line);background:none;width:100%;font-size:18px;padding:20px 0 16px;outline:none}.search-result{display:block;padding:14px 9px;border-bottom:1px solid var(--line);font-size:14px}.search-result small{display:block;font-size:11px;color:var(--muted);margin-bottom:4px}.search-result:focus,.search-result.selected{background:#e6edf1;outline:none}.search-hint{font-size:10px;color:var(--muted);margin:16px 0 0}.search-empty{font-size:13px;color:var(--muted);padding:20px 0}.pet-widget{position:fixed;width:175px;height:126px;right:18px;bottom:12px;z-index:45;transition:opacity .2s}.pet-character{background:none;border:0;padding:0;width:100%;height:100%;display:block;transform-origin:50% 85%;animation:pet-breathe 5.5s ease-in-out infinite}.pet-character img{width:100%;height:100%;object-fit:contain;user-select:none;filter:drop-shadow(0 5px 4px #16314814)}.pet-widget.sleeping .pet-character{animation:none;opacity:.65;transform:translateY(5px)}.pet-widget.petting .pet-character{animation:pet-hop .55s ease}.about{padding-top:15px}.about h1{font-size:30px}.about .section-index{display:inline-block;margin-bottom:20px}
@keyframes scroll-drift{0%,100%{transform:translateY(0);opacity:.4}55%{transform:translateY(28px);opacity:1}}@keyframes light-drift{from{background-position:0% 50%;opacity:.45}to{background-position:100% 50%;opacity:.85}}@keyframes pet-breathe{0%,100%{transform:translateY(0)}50%{transform:translateY(-2px)}}@keyframes pet-hop{0%,100%{transform:translateY(0)}40%{transform:translateY(-9px) rotate(-3deg)}70%{transform:translateY(-3px) rotate(2deg)}}
@media(min-width:1700px){.hero-image{object-position:50% 46%}}
@media(max-width:1420px){.wrap,.top-inner,.footer{margin-left:48px;margin-right:48px}.doc-shell{gap:35px;grid-template-columns:165px minmax(0,1fr)}.article-layout{grid-template-columns:minmax(0,1fr) 140px;gap:26px}.recent-layout{gap:42px;grid-template-columns:minmax(0,1fr) 210px}}
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