:root{color-scheme:dark;--gold:#ddc593;--ink:#41463d;--muted:#a9bcb9}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:radial-gradient(ellipse at 85% 0,#26434766,transparent 48%),#0b1928;color:#e9e1cc;font-family:"Noto Serif SC",Songti SC,SimSun,serif;line-height:1.85}a{color:inherit;text-decoration:none}a:hover{color:#b98e43}button,input,select{font:inherit}button,a,input,select,summary{touch-action:manipulation}button,summary{cursor:pointer}:focus-visible{outline:2px solid #b98b39;outline-offset:4px}[hidden]{display:none!important}.library-shell{max-width:1320px;margin:auto;padding:0 48px}.library-top{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:27px 0;border-bottom:1px solid #c3ad7630;font-size:12px;color:#bdc9c2}.library-top>span{font-size:11px;letter-spacing:.13em;color:#dac494}.library-hero{padding:65px 0 48px;position:relative}.library-hero:after{content:"笺";font-size:260px;position:absolute;right:6%;top:-10px;line-height:1.3;color:#d9cda908;pointer-events:none}.eyebrow{font-size:11px;letter-spacing:.14em;color:#b5a17a;margin:0 0 13px}.library-hero h1{font-size:clamp(34px,4.4vw,60px);font-weight:400;letter-spacing:.06em;line-height:1.4;margin:0 0 20px}.library-hero>p:not(.eyebrow){font-size:14px;color:var(--muted)}.library-entry{display:grid;grid-template-columns:repeat(3,1fr);margin-top:35px;border-top:1px solid #c3ad7638;border-bottom:1px solid #c3ad7638;position:relative}.library-entry a{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:22px 20px;font-size:13px;border-right:1px solid #c3ad7628}.library-entry a:first-child{padding-left:0}.library-entry a:last-child{border:0}.library-entry span{color:#ccb47f;font-size:11px}.library-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:42px;align-items:start}.library-sidebar{position:sticky;top:25px;max-height:calc(100dvh - 50px);overflow:auto;scrollbar-width:thin;font-size:12px;padding-right:10px}.library-sidebar label{display:block;color:#dbcbab;margin-bottom:10px}.library-sidebar input{width:100%;border:1px solid #b6a37650;background:#152a36;padding:10px 12px;border-radius:4px;color:#f0e7d1;font-size:12px}.library-sidebar input::placeholder{color:#8a9e9e}.library-sidebar>p{font-size:11px;color:#a1b4b2;margin:14px 0}.library-sidebar>small{font-size:10px;color:#819795}.library-sidebar nav{display:flex;flex-direction:column;gap:3px;border-top:1px solid #b6a37628;padding-top:15px}.library-sidebar nav a{padding:9px 8px;border-left:1px solid transparent;color:#a6bcb9}.library-sidebar nav a[aria-current=true]{color:#efd5a0;border-color:#d5b777;background:linear-gradient(90deg,#c7b27b16,transparent)}.library-sidebar nav small{font-size:10px;color:#a18e63;margin-right:13px}.lesson{background:linear-gradient(110deg,#f4eedc,#e9e0c9);color:var(--ink);padding:38px 46px;margin-bottom:26px;border:1px solid #dfcba166;border-radius:3px;box-shadow:0 14px 50px #0002;scroll-margin-top:24px;color-scheme:light}.lesson>header{display:flex;gap:22px;align-items:start;border-bottom:1px solid #9a875233;padding-bottom:25px;margin-bottom:25px}.lesson-number{font-size:37px;line-height:1.25;color:#b9a573;font-weight:400}.lesson h2{font-size:25px;line-height:1.5;font-weight:400;color:#665536;margin:0}.lesson .eyebrow{color:#8e784b;font-size:10px;margin:0 0 7px}.lesson p,.lesson li{font-size:14px;line-height:1.95}.lesson strong,.lesson b{color:#6b542d;font-weight:500}.reading-steps{list-style:none;padding:0;counter-reset:read}.reading-steps li{counter-increment:read;padding:0 0 19px 38px;position:relative}.reading-steps li:before{content:counter(read,decimal-leading-zero);position:absolute;left:0;top:1px;color:#a48d5e;font-size:12px}.reading-steps p{margin:6px 0 0}.note{border-left:2px solid #a68e57;padding:12px 16px;background:#b4a57712;font-size:12px!important;color:#71705f}.inline-link{display:inline-block;border-bottom:1px solid #a88a4c88;color:#86682e;font-size:13px;margin-top:10px}.lesson details{border-bottom:1px solid #9a875230;padding:15px 0}.lesson summary{font-size:14px;color:#685638}.lesson details p{font-size:13px}.lesson-end{display:flex;justify-content:space-between;align-items:center;margin-top:30px;padding-top:18px;border-top:1px solid #9a875230;font-size:12px}.lesson-end button{font-size:11px;border:1px solid #aa93544d;background:transparent;color:#8b7546;padding:8px 13px;border-radius:3px}.lesson-end button[aria-pressed=true]{background:#284846;color:#e6dfc9;border-color:#284846}.lesson-end a{color:#8b7546}.sample-pillars{display:grid;grid-template-columns:repeat(4,1fr);text-align:center;margin:28px 0;padding:23px 10px;background:#1a303a;color:#bcb896;border-radius:3px;font-size:11px;gap:8px}.sample-pillars strong{display:block;color:#dfd4b0;font-size:37px;line-height:1.5;font-weight:400;margin:12px 0}.sample-pillars mark{color:#f4d694;background:transparent;border-bottom:1px solid #dcc28a}.sample-pillars small{font-size:10px;color:#d8c390}.term-strip{display:grid;grid-template-columns:1fr 1.4fr 1fr;text-align:center;align-items:center;margin:25px 0;background:#bdab7520;padding:18px;gap:12px;font-size:14px}.term-strip small{font-size:11px}.term-strip strong{background:#24434a;color:#e6d8b2;padding:12px}.element-strip{display:flex;gap:10px;flex-wrap:wrap;border-top:1px solid #a48c4433;border-bottom:1px solid #a48c4433;padding:20px 0;justify-content:space-around}.element-strip>span{color:#827246;font-size:22px;text-align:center}.element-strip b{display:block;font-size:11px;margin-top:8px;color:#6e7062}.table-wrap{overflow:auto;margin:25px 0}table{width:100%;border-collapse:collapse;font-size:13px}caption{text-align:left;color:#85744e;font-size:11px;margin-bottom:12px}th,td{text-align:left;padding:12px 15px;border-bottom:1px solid #a48c4430}th{background:#b19a5620;font-weight:500;color:#75623b}.practice{background:#16343d;color:#e1ddc9;border:1px solid #768d7970;padding:25px;margin:28px 0;border-radius:4px}.practice .eyebrow{color:#bda575}.practice-controls{display:flex;gap:20px;align-items:center}.practice-controls label{flex:1;font-size:11px;color:#b6c3b7}.practice-controls>span{font-size:11px;color:#a69b7e}.practice select{display:block;width:100%;margin-top:8px;padding:9px;background:#203f47;color:#e7dfc6;border:1px solid #b1a17466;border-radius:2px;font-size:16px}.practice output{display:block;margin:20px 0 12px;padding-top:18px;border-top:1px solid #b4a27333;font-size:18px;line-height:1.8;color:#e5ce9d}.practice small{font-size:11px;color:#a8bfbc}.interpret-example{border:1px solid #a48c4433;padding:22px;margin:25px 0}.interpret-example>small{color:#9b8350}.source{font-size:11px!important;color:#8b7d5c}.source a{text-decoration:underline;text-underline-offset:3px}.source-list{list-style:none;padding:0}.source-list li{padding:15px 0;border-bottom:1px solid #a48c4430}.source-list a{color:#806332}.source-list span{display:block;font-size:12px;color:#7c7e6b}.library-bottom{padding:45px 0 60px;text-align:center;color:#b7c5bd;font-size:13px}.library-bottom p{font-size:11px;color:#7d9797}@media(max-width:760px){.library-shell{padding:0 20px}.library-top{font-size:10px;gap:10px}.library-top>span{display:none}.library-hero{padding:40px 0 30px}.library-hero:after{font-size:180px;right:0;top:15px}.library-hero h1{font-size:34px}.library-hero>p:not(.eyebrow){font-size:12px}.library-entry{grid-template-columns:1fr}.library-entry a{padding:13px 0;border-right:0;border-bottom:1px solid #c3ad7628;font-size:12px}.library-layout{grid-template-columns:1fr;gap:22px}.library-sidebar{position:static;max-height:none;padding:0}.library-sidebar nav{display:grid;grid-template-columns:repeat(2,1fr);gap:0}.library-sidebar nav a{padding:6px}.lesson{padding:25px 21px}.lesson>header{gap:12px;padding-bottom:18px;margin-bottom:18px}.lesson-number{font-size:27px}.lesson h2{font-size:21px}.lesson p,.lesson li{font-size:13px}.term-strip{padding:10px;gap:5px;font-size:11px}.term-strip strong{padding:9px 4px}.term-strip small{font-size:9px}.practice{padding:18px}.practice-controls{gap:10px}.practice output{font-size:16px}th,td{padding:9px 8px;font-size:12px}.lesson-end{gap:10px}.lesson-end a{font-size:11px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}