@font-face{font-family:PaperSerif;src:local("Noto Serif CJK SC"),local("Source Han Serif SC"),local("Songti SC"),local("STSong");font-display:swap}
:root{--bg:#f6f4ee;--paper:#fffdf8;--ink:#232d2a;--muted:#79817b;--line:#dedfd4;--accent:#1d6555;--accent-soft:#e5eee5;--gold:#b38045;--shadow:0 12px 48px #28382d0a;--font:18px;--nav:74px;--radius:18px;color-scheme:light}
:root[data-theme=dark]{--bg:#171e1b;--paper:#202923;--ink:#e1e8dc;--muted:#9ca99d;--line:#354237;--accent:#a0ccb4;--accent-soft:#2e4437;--gold:#ddba83;--shadow:0 12px 48px #0002;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:82px}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans CJK SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button{color:inherit}a{color:var(--accent);text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--gold);outline-offset:4px}button:disabled{opacity:.4;cursor:default}svg{width:20px;height:20px;flex-shrink:0}button svg{pointer-events:none}button{border:0;background:none}button:active{transform:translateY(1px)}[hidden]{display:none!important}.skip-link{position:fixed;left:16px;top:-80px;z-index:100;background:var(--paper);padding:12px}.skip-link:focus{top:10px}.site-header{height:80px;max-width:1120px;margin:auto;padding:0 34px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink)}.brand-mark{width:34px;height:34px;background:var(--accent);color:var(--paper);border-radius:10px;display:grid;place-items:center}.brand-name{font-family:PaperSerif,"Songti SC",serif;font-size:23px;font-weight:700;letter-spacing:2px}.brand-sub{color:var(--muted);font-size:10px;letter-spacing:2px;margin-left:3px;padding-top:3px}.header-right{display:flex;align-items:center;gap:22px}.header-note{font-size:12px;color:var(--muted)}.icon-button{width:42px;height:42px;border:1px solid var(--line);border-radius:50%;display:inline-grid;place-items:center;background:var(--paper);flex-shrink:0}.icon-button.active{color:var(--accent);background:var(--accent-soft);border-color:var(--accent)}#main{max-width:1080px;margin:auto;padding:44px 24px 130px;min-height:calc(100svh - 80px)}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--muted);font-weight:600;text-transform:uppercase}.hero{padding:6px 0 34px;display:flex;justify-content:space-between;align-items:end;gap:24px}.hero h1{font:500 clamp(29px,4vw,42px)/1.5 PaperSerif,"Songti SC",serif;letter-spacing:1px;margin:13px 0 8px}.hero h1 em{font-style:normal;color:var(--accent)}.hero p{font-size:14px;color:var(--muted);margin:0;line-height:1.8}.hero-stamp{font-family:PaperSerif,"Songti SC",serif;writing-mode:vertical-rl;border:1px solid var(--line);font-size:13px;letter-spacing:5px;padding:16px 10px;color:var(--accent);margin-bottom:4px}.today-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:32px 34px;display:grid;grid-template-columns:1fr 180px;gap:36px;box-shadow:var(--shadow);position:relative;overflow:hidden}.today-card::before{content:"";position:absolute;left:0;top:27px;bottom:27px;width:3px;background:var(--accent)}.today-top{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:17px}.pill{font-size:11px;padding:5px 9px;border:1px solid var(--line);border-radius:6px;color:var(--muted);white-space:nowrap}.pill.green{background:var(--accent-soft);border-color:transparent;color:var(--accent)}.today-card h2{font:600 27px/1.5 PaperSerif,Georgia,serif;margin:0 0 13px;max-width:700px;overflow-wrap:anywhere}.paper-summary{color:var(--muted);font-size:14px;line-height:1.9;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin:0}.today-meta{font-size:12px;color:var(--muted);display:flex;gap:15px;align-items:center;flex-wrap:wrap;margin-top:22px}.today-action{border-left:1px solid var(--line);display:flex;flex-direction:column;justify-content:center;align-items:flex-start;padding-left:30px;gap:18px}.reading-count{font-family:Georgia,serif;font-size:42px;line-height:1;color:var(--accent);letter-spacing:-2px}.reading-count small{font:12px -apple-system,sans-serif;letter-spacing:0;color:var(--muted);margin-left:8px}.tiny-label{font-size:11px;color:var(--muted);margin-top:8px}.primary-button{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 18px;background:var(--accent);color:var(--paper);font-size:13px;border-radius:9px;font-weight:600;white-space:nowrap}.primary-button svg{width:16px}.section-heading{display:flex;align-items:center;justify-content:space-between;margin:39px 0 19px;gap:16px}.section-heading h2{margin:0;font:600 21px PaperSerif,"Songti SC",serif;letter-spacing:1px}.section-heading h2 small{font:12px -apple-system,sans-serif;color:var(--muted);margin-left:10px}.quiet-button{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:5px;padding:7px 0}.quiet-button svg{width:15px}.search-box{display:flex;align-items:center;gap:10px;padding:12px 15px;border:1px solid var(--line);background:var(--paper);border-radius:11px}.search-box svg{width:17px;color:var(--muted)}.search-box input{background:none;outline:none;border:0;color:var(--ink);width:100%;font-size:14px;min-width:0}.search-box input::placeholder{color:var(--muted)}.library-tools{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin-bottom:21px}.library-tools .search-box{width:270px}.filters{display:flex;gap:7px;overflow-x:auto;scrollbar-width:none;padding:3px 0;max-width:100%}.filters::-webkit-scrollbar{display:none}.filter-button{font-size:12px;white-space:nowrap;padding:9px 12px;border:1px solid var(--line);border-radius:8px;color:var(--muted)}.filter-button.selected{color:var(--paper);background:var(--accent);border-color:var(--accent)}.paper-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.paper-card{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:23px;position:relative;transition:border-color .2s,transform .2s;min-width:0}.paper-card:hover{border-color:var(--accent);transform:translateY(-2px)}.paper-card-link{display:block;color:inherit}.paper-card-top{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:13px}.paper-card-top .eyebrow{font-size:10px;letter-spacing:1px;color:var(--accent)}.paper-card h3{font:600 19px/1.55 PaperSerif,Georgia,serif;letter-spacing:.1px;margin:0 0 10px;overflow-wrap:anywhere}.paper-card .paper-summary{font-size:12px;-webkit-line-clamp:2}.paper-card-footer{display:flex;align-items:center;gap:15px;margin-top:23px;font-size:11px;color:var(--muted)}.paper-card-footer .spacer{flex:1}.progress-track{height:3px;border-radius:3px;background:var(--line);overflow:hidden;min-width:40px}.progress-track span{display:block;height:100%;background:var(--accent);transition:width .25s}.card-progress{margin-top:17px}.page-foot{margin-top:40px;border-top:1px solid var(--line);padding-top:19px;display:flex;justify-content:space-between;gap:14px;color:var(--muted);font-size:10px;line-height:1.7;letter-spacing:.3px}.bottom-nav{height:var(--nav);position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;background:var(--paper);border-top:1px solid var(--line);display:flex;justify-content:center;gap:32px;z-index:20;padding-bottom:env(safe-area-inset-bottom)}.nav-item{width:105px;display:flex;align-items:center;justify-content:center;gap:9px;font-size:12px;color:var(--muted);position:relative}.nav-item.active{color:var(--accent);font-weight:600}.nav-item.active::before{content:"";position:absolute;top:0;left:35%;right:35%;height:2px;background:var(--accent)}.nav-item svg{width:19px;height:19px}.loading-state,.empty-state{text-align:center;padding:90px 20px;color:var(--muted);font-size:14px;line-height:1.8}.empty-state svg{width:36px;height:36px;color:var(--accent);margin-bottom:15px}.empty-state h2{font-size:20px;font-weight:500;color:var(--ink);margin:5px 0 12px}.loading-dot{width:8px;height:8px;background:var(--accent);border-radius:50%;display:inline-block;animation:pulse 1.2s infinite}.page-title{font:500 32px PaperSerif,"Songti SC",serif;margin:5px 0 15px;letter-spacing:1px}.page-lead{font-size:14px;color:var(--muted);line-height:1.8;margin:0 0 28px}.bookmark-card{margin-bottom:12px;display:flex;align-items:center;gap:18px;padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:13px}.bookmark-card .bookmark-link{flex:1;min-width:0}.bookmark-card h3{font-size:15px;line-height:1.6;margin:0 0 6px;color:var(--ink);font-weight:500}.bookmark-card p{color:var(--muted);font-size:12px;margin:0}.bookmark-card .unit-number{font-family:Georgia,serif;font-size:27px;color:var(--accent);align-self:start}.reader-top{display:flex;align-items:center;justify-content:space-between;gap:15px;max-width:790px;margin:0 auto 29px}.reader-top .back-link{font-size:12px;display:flex;align-items:center;gap:7px;color:var(--muted)}.reader-actions{display:flex;gap:9px}.reader-actions .icon-button{width:38px;height:38px}.reader-content{max-width:760px;margin:auto}.reader-paper{padding-bottom:26px;border-bottom:1px solid var(--line);margin-bottom:30px}.reader-paper h1{font:600 25px/1.55 PaperSerif,Georgia,serif;overflow-wrap:anywhere;margin:13px 0 10px}.reader-paper .reader-byline{font-size:11px;color:var(--muted);line-height:1.8}.unit-position{display:flex;align-items:center;justify-content:space-between;margin-bottom:19px;font-size:11px;color:var(--muted);gap:18px}.unit-position .progress-track{width:130px}.unit-heading{font:600 27px/1.6 PaperSerif,"Songti SC",serif;letter-spacing:.3px;margin:0 0 22px;overflow-wrap:anywhere}.reader-context{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:0 0 25px}.unit-page{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:7px}.unit-page svg{width:15px}.term-chips{display:flex;gap:7px;flex-wrap:wrap;margin:0 0 29px}.term-chip{color:var(--accent);font-size:11px;padding:7px 9px;background:var(--accent-soft);border-radius:5px;line-height:1.4;text-align:left}.term-chip .term-id{font-size:9px;opacity:.7;margin-left:5px}.text-section{margin-bottom:34px}.section-label{display:flex;align-items:center;gap:9px;margin-bottom:14px;color:var(--muted);font-size:10px;letter-spacing:2px;font-weight:600}.section-label::before{content:"";width:13px;height:1px;background:var(--muted)}.text-section.explanation{padding:25px 27px 5px;background:var(--accent-soft);border-radius:12px;border:1px solid transparent}.text-section.explanation .section-label{color:var(--accent)}.text-section.explanation .section-label::before{background:var(--accent)}.prose{font-family:PaperSerif,"Songti SC","STSong",Georgia,serif;font-size:var(--font);line-height:1.95;overflow-wrap:break-word;letter-spacing:.02em}.prose p{margin:0 0 1.2em}.prose p:last-child{margin-bottom:0}.prose h1,.prose h2,.prose h3,.prose h4{font-family:-apple-system,"PingFang SC",sans-serif;font-weight:600;line-height:1.65;letter-spacing:0;margin:1.7em 0 .7em;font-size:1.1em}.prose h1:first-child,.prose h2:first-child,.prose h3:first-child,.prose h4:first-child{margin-top:0}.prose h1{font-size:1.3em}.prose h2{font-size:1.2em}.prose ul,.prose ol{padding-left:1.45em;margin:.6em 0 1.2em}.prose li{margin-bottom:.5em}.prose li p{margin:.5em 0}.prose a{text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--accent),transparent 65%);text-underline-offset:3px}.prose strong{font-weight:700;color:var(--ink)}.prose code{font: .83em/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;background:color-mix(in srgb,var(--muted),transparent 88%);padding:.14em .3em;border-radius:4px;word-break:break-word;letter-spacing:0}.prose pre{background:var(--bg);border:1px solid var(--line);border-radius:9px;padding:16px;overflow:auto;white-space:pre;max-width:100%;line-height:1.6;font-size:13px;letter-spacing:0}.prose pre code{background:none;padding:0;word-break:normal}.prose blockquote{border-left:2px solid var(--accent);padding:4px 0 4px 17px;margin:1.2em 0;color:var(--muted)}.prose table{display:block;border-collapse:collapse;max-width:100%;width:max-content;overflow-x:auto;font-family:-apple-system,sans-serif;font-size:.78em;line-height:1.7;margin:1.2em 0}.prose th,.prose td{padding:10px 13px;border:1px solid var(--line);text-align:left;min-width:75px}.prose th{background:var(--bg)}.prose img{max-width:100%;height:auto;display:block;border-radius:7px}.prose hr{border:0;border-top:1px solid var(--line);margin:1.7em 0}.prose .katex{font-size:1.07em;letter-spacing:0}.prose .katex-display{overflow:auto hidden;padding:10px 0;font-size:.9em;margin:1em 0;scrollbar-width:thin}.original-block{border:1px solid var(--line);border-radius:11px;margin:0 0 29px;background:var(--paper)}.original-block summary{padding:16px 19px;list-style:none;font-size:12px;color:var(--muted);display:flex;align-items:center;justify-content:space-between;cursor:pointer}.original-block summary::-webkit-details-marker{display:none}.original-block summary svg{width:16px;transition:transform .2s}.original-block[open] summary svg{transform:rotate(180deg)}.original-block .prose{padding:7px 20px 22px;font-size:calc(var(--font) - 1px);line-height:1.85;letter-spacing:0}.source-figure{margin:25px 0 30px;background:var(--paper);border:1px solid var(--line);padding:12px;border-radius:12px}.source-figure img{display:block;max-width:100%;height:auto;border-radius:4px}.source-figure button{padding:0;width:100%;display:block}.source-figure figcaption{font-size:11px;color:var(--muted);line-height:1.7;margin:10px 3px 1px}.unit-end{margin-top:35px;border-top:1px solid var(--line);padding:23px 0 0;display:flex;align-items:center;gap:15px;font-size:12px;color:var(--muted)}.unit-end .end-mark{width:25px;height:25px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;font-family:Georgia,serif;color:var(--gold)}.reader-dock{max-width:760px;position:sticky;bottom:calc(var(--nav) + 12px);background:var(--paper);padding:12px 15px;margin:42px auto 0;display:flex;align-items:center;gap:13px;border:1px solid var(--line);border-radius:13px;box-shadow:0 5px 30px #0000000d;z-index:10}.reader-dock .dock-index{flex:1;color:var(--muted);font-size:11px;text-align:center;min-height:40px}.reader-dock .dock-index span{display:block;font-size:9px;margin-top:3px;letter-spacing:1px}.dock-button{display:flex;align-items:center;justify-content:center;gap:8px;font-size:12px;padding:12px 15px;min-width:95px;border-radius:8px;color:var(--accent)}.dock-button.next{background:var(--accent);color:var(--paper)}.dock-button svg{width:15px}.glossary-tools{max-width:640px;margin-bottom:22px}.term-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.term-row{display:flex;align-items:center;gap:15px;text-align:left;background:var(--paper);border:1px solid var(--line);padding:18px;border-radius:11px;min-width:0}.term-row span{min-width:0;flex:1}.term-row strong{font-size:14px;display:block;line-height:1.6;font-weight:500;overflow-wrap:anywhere}.term-row small{font:10px ui-monospace,monospace;color:var(--muted);display:block;margin-top:4px}.term-row svg{width:15px;color:var(--muted)}.settings-panel{background:var(--paper);border:1px solid var(--line);border-radius:14px;max-width:720px;overflow:hidden;margin-bottom:22px}.setting-row{padding:24px;display:flex;justify-content:space-between;align-items:center;gap:24px;border-bottom:1px solid var(--line)}.setting-row:last-child{border-bottom:0}.setting-copy strong{font-size:14px;font-weight:500;display:block;line-height:1.8}.setting-copy p{font-size:11px;color:var(--muted);margin:5px 0 0;line-height:1.7}.segmented{display:flex;border:1px solid var(--line);padding:3px;border-radius:9px;flex-shrink:0}.segmented button{padding:8px 11px;font-size:11px;border-radius:6px;color:var(--muted)}.segmented button.active{background:var(--accent-soft);color:var(--accent)}.font-control{display:flex;align-items:center;gap:12px;flex-shrink:0}.font-control button{width:34px;height:34px;border:1px solid var(--line);border-radius:8px}.font-control span{font-size:12px;color:var(--muted);min-width:28px;text-align:center}.font-preview{max-width:720px;padding:23px;background:var(--accent-soft);border-radius:12px}.font-preview .prose{margin:0}.settings-note{font-size:12px;line-height:1.9;color:var(--muted);max-width:720px;margin:24px 0}.danger-link{font-size:12px;color:#a8684b;padding:0}.overlay-backdrop{position:fixed;inset:0;background:#14231bc2;backdrop-filter:blur(3px);z-index:40;display:flex;align-items:center;justify-content:center;padding:30px}.sheet{background:var(--paper);border-radius:18px;width:660px;max-width:100%;max-height:calc(100svh - 60px);box-shadow:0 12px 80px #0003;display:flex;flex-direction:column;overflow:hidden;animation:sheetIn .2s ease-out}.sheet-handle{display:none}.sheet-header{display:flex;justify-content:space-between;align-items:start;gap:20px;padding:25px 27px 20px;border-bottom:1px solid var(--line);flex-shrink:0}.sheet-header h2{font:600 22px/1.55 PaperSerif,"Songti SC",serif;margin:8px 0 0;overflow-wrap:anywhere}.sheet-header .icon-button{width:34px;height:34px}.sheet-body{overflow-y:auto;padding:25px 27px 35px;overscroll-behavior:contain;scrollbar-width:thin}.sheet-body .prose{font-size:16px;line-height:1.9}.sheet-search{padding:16px 25px 0}.sheet-footer{padding:15px 25px;border-top:1px solid var(--line);font-size:11px;color:var(--muted);flex-shrink:0;display:flex;align-items:center;justify-content:space-between}.unit-list{display:flex;flex-direction:column;gap:7px}.unit-list a{padding:13px 11px;border-radius:8px;display:flex;gap:14px;color:var(--ink);font-size:13px;line-height:1.65;align-items:start}.unit-list a.selected{background:var(--accent-soft);color:var(--accent)}.unit-list .unit-no{color:var(--muted);font:12px Georgia,serif;padding-top:3px;min-width:23px}.unit-list .unit-check{margin-left:auto;color:var(--accent);font-size:12px}.unit-list .unit-title{flex:1}.unit-list small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.sheet-image{width:100%;height:auto;display:block}.image-sheet{width:960px}.references-list{font-size:13px;line-height:1.8;color:var(--muted)}.references-list p{padding-bottom:14px;margin-bottom:14px;border-bottom:1px solid var(--line);white-space:pre-wrap;overflow-wrap:anywhere}.about-meta{font-size:12px;line-height:1.9;color:var(--muted)}.about-meta a{overflow-wrap:anywhere}.about-meta strong{font-weight:500;color:var(--ink)}#toast{position:fixed;left:50%;transform:translate(-50%,20px);bottom:calc(var(--nav) + 22px);background:var(--ink);color:var(--bg);font-size:12px;padding:12px 20px;border-radius:30px;z-index:70;opacity:0;pointer-events:none;transition:.2s;max-width:calc(100% - 35px);text-align:center;box-shadow:0 4px 18px #0002}#toast.visible{opacity:1;transform:translate(-50%,0)}body.sheet-open{overflow:hidden}.noscript{text-align:center;padding:60px 20px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@keyframes pulse{50%{opacity:.3}}@keyframes sheetIn{from{transform:translateY(15px);opacity:.5}to{transform:translateY(0);opacity:1}}
@media(min-width:900px){body.is-reader .site-header{max-width:920px}.reader-dock{bottom:calc(var(--nav) + 18px)}.library-tools .filters{flex:1}.reader-content .prose{line-height:2.05}}@media(max-width:700px){:root{--nav:calc(64px + env(safe-area-inset-bottom))}.site-header{height:66px;padding:0 21px}.brand-mark{width:30px;height:30px;border-radius:8px}.brand-mark svg{width:18px}.brand-name{font-size:22px}.brand-sub{font-size:8px;letter-spacing:1.7px;margin-left:0}.header-note{display:none}.header-right{gap:8px}.site-header .icon-button{width:35px;height:35px;border:0;background:none}#main{padding:26px 20px 112px;min-height:calc(100svh - 66px)}.hero{padding:4px 0 27px;gap:10px;align-items:center}.hero h1{font-size:28px;line-height:1.6;margin:9px 0 7px;letter-spacing:.2px}.hero p{font-size:12px}.hero .eyebrow{font-size:9px;letter-spacing:1.8px}.hero-stamp{font-size:10px;padding:12px 7px;letter-spacing:4px;margin-right:1px}.today-card{display:block;padding:25px 23px 21px;border-radius:14px}.today-card::before{top:24px;bottom:24px}.today-top{margin-bottom:15px;gap:7px}.pill{font-size:9px;padding:4px 7px}.today-card h2{font-size:23px;line-height:1.6;margin-bottom:12px}.paper-summary{font-size:13px;line-height:1.85;-webkit-line-clamp:3}.today-meta{font-size:10px;margin-top:17px;gap:12px}.today-action{border-left:0;border-top:1px solid var(--line);padding:19px 0 0;margin-top:20px;flex-direction:row;justify-content:space-between;align-items:center;gap:14px}.today-action .reading-count{font-size:28px;letter-spacing:-1px}.reading-count small{font-size:10px;letter-spacing:0}.today-action .tiny-label{display:none}.primary-button{font-size:12px;padding:12px 14px;gap:8px}.section-heading{margin:30px 0 16px}.section-heading h2{font-size:19px}.section-heading h2 small{font-size:10px}.quiet-button{font-size:10px}.library-tools{gap:12px;margin-bottom:16px}.library-tools .search-box{width:100%;padding:11px 13px}.search-box input{font-size:12px}.filters{width:calc(100% + 20px);margin-right:-20px;padding-right:20px;gap:6px}.filter-button{font-size:10px;padding:8px 10px}.paper-grid{grid-template-columns:1fr;gap:12px}.paper-card{padding:21px}.paper-card h3{font-size:20px}.paper-card-top .eyebrow{font-size:9px}.paper-card-footer{margin-top:18px;font-size:10px}.paper-card .paper-summary{font-size:12px}.bottom-nav{justify-content:space-around;gap:0;padding-left:8px;padding-right:8px}.nav-item{width:25%;flex-direction:column;gap:4px;font-size:9px;padding-top:10px;padding-bottom:9px;justify-content:start}.nav-item svg{width:19px;height:19px}.nav-item.active::before{left:38%;right:38%}.page-foot{font-size:9px;margin-top:28px;flex-direction:column;gap:4px}.page-title{font-size:28px;margin:6px 0 12px}.page-lead{font-size:12px;margin-bottom:25px}.term-list{grid-template-columns:1fr;gap:8px}.term-row{padding:15px 16px}.term-row strong{font-size:13px}.term-row small{font-size:9px}.settings-panel{border-radius:12px}.setting-row{padding:20px 17px;gap:16px;flex-wrap:wrap}.setting-copy strong{font-size:13px}.setting-copy p{font-size:10px}.segmented button{font-size:10px;padding:8px 10px}.font-control{margin-left:auto}.font-preview{padding:21px}.reader-top{margin-bottom:24px}.reader-top .back-link{font-size:11px}.reader-actions{gap:7px}.reader-actions .icon-button{width:34px;height:34px}.reader-actions svg{width:16px;height:16px}.reader-paper{padding-bottom:21px;margin-bottom:23px}.reader-paper h1{font-size:21px;line-height:1.65;margin:10px 0 9px}.reader-paper .reader-byline{font-size:10px}.reader-paper .eyebrow{font-size:9px;letter-spacing:1px}.unit-position{font-size:10px;margin-bottom:17px}.unit-position .progress-track{width:90px}.unit-heading{font-size:24px;line-height:1.65;margin-bottom:17px}.reader-context{margin-bottom:21px}.unit-page{font-size:10px}.term-chips{gap:6px;margin-bottom:25px}.term-chip{font-size:10px;padding:6px 8px}.term-chip .term-id{font-size:8px}.section-label{font-size:9px;margin-bottom:13px;letter-spacing:1.7px}.text-section{margin-bottom:28px}.text-section.explanation{padding:20px 18px 5px;margin-left:-3px;margin-right:-3px;border-radius:10px}.prose{line-height:1.95;letter-spacing:.015em}.prose pre{font-size:11px;padding:12px}.prose .katex{font-size:1em}.prose .katex-display{font-size:.84em}.original-block{margin-bottom:25px}.original-block summary{padding:14px 16px;font-size:11px}.original-block .prose{padding:5px 16px 19px;font-size:calc(var(--font) - 2px);line-height:1.8}.source-figure{padding:8px;margin:20px 0 25px}.source-figure figcaption{font-size:10px}.unit-end{font-size:10px;padding-top:21px;gap:11px}.unit-end .end-mark{width:22px;height:22px}.reader-dock{bottom:calc(var(--nav) + 9px);margin-top:33px;padding:9px;gap:5px;border-radius:11px;margin-left:-8px;margin-right:-8px}.dock-button{min-width:83px;padding:11px 10px;font-size:11px;gap:5px}.reader-dock .dock-index{font-size:10px}.reader-dock .dock-index span{font-size:8px}.overlay-backdrop{padding:0;align-items:end}.sheet{width:100%;max-height:88svh;border-radius:18px 18px 0 0;max-width:100%;padding-bottom:env(safe-area-inset-bottom);animation:sheetIn .25s ease-out}.sheet-handle{display:block;background:var(--line);height:4px;width:33px;border-radius:4px;margin:10px auto 0;flex-shrink:0}.sheet-header{padding:17px 22px 18px;gap:17px}.sheet-header h2{font-size:21px;margin-top:6px}.sheet-header .eyebrow{font-size:9px}.sheet-body{padding:22px 22px 30px}.sheet-body .prose{font-size:16px;line-height:1.9}.sheet-search{padding:16px 22px 0}.sheet-footer{padding:14px 22px;font-size:10px}.bookmark-card{padding:17px;gap:13px}.bookmark-card h3{font-size:13px}.bookmark-card .unit-number{font-size:23px}.bookmark-card p{font-size:10px}.bookmark-card .icon-button{width:33px;height:33px}.bookmark-card .icon-button svg{width:15px}.settings-note{font-size:11px}.references-list{font-size:11px}.image-sheet{max-height:92svh}.image-sheet .sheet-body{padding:12px;overflow:auto}.image-sheet .sheet-image{min-width:600px;max-width:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media print{.site-header,.bottom-nav,.reader-dock,.reader-top,.reader-context,.term-chips,.page-foot,#overlay{display:none!important}body{background:white;color:black}#main{padding:0}.reader-content{max-width:none}.original-block{display:block}.text-section.explanation{background:none;border:1px solid #ccc}.prose{font-size:11pt}.original-block .prose{display:block}}
.reader-attribution{border-top:1px solid var(--line);margin-top:25px;padding-top:17px;display:flex;flex-direction:column;gap:6px;font-size:10px;line-height:1.8;color:var(--muted)}.reader-attribution a{color:var(--muted);text-decoration:underline;text-underline-offset:3px}.sheet-body .term-list{grid-template-columns:1fr}.mobile-break{display:none}@media(max-width:700px){.mobile-break{display:block}.reader-attribution{font-size:9px}}
/* Optional private synchronization and device-local preferences. */
.sync-panel{max-width:720px;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:27px;margin:26px 0}.sync-panel h2{font:500 24px/1.6 PaperSerif,"Songti SC",serif;margin:0 0 10px}.sync-description{font-size:12px;color:var(--muted);line-height:1.9;margin:0 0 21px}.sync-status{display:flex;align-items:start;gap:10px;background:var(--bg);padding:14px 15px;border:1px solid var(--line);border-radius:9px;font-size:12px;line-height:1.8;margin-bottom:20px}.sync-status small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.sync-indicator{width:7px;height:7px;border-radius:50%;background:var(--muted);margin-top:7px;flex-shrink:0}.sync-status.synced .sync-indicator{background:var(--accent)}.sync-status.syncing .sync-indicator,.sync-status.connecting .sync-indicator{background:var(--accent);animation:pulse 1.2s infinite}.sync-status.offline .sync-indicator,.sync-status.error .sync-indicator{background:var(--gold)}.sync-token-label{display:block;font-size:11px;margin-bottom:8px;color:var(--muted)}.sync-token-input{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:13px 14px;color:var(--ink);font:13px ui-monospace,SFMono-Regular,Consolas,monospace;outline:none}.sync-buttons{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-top:17px}.sync-buttons .primary-button{font-size:12px}.sync-privacy{font-size:10px;line-height:1.8;color:var(--muted);margin:18px 0 0;overflow-wrap:anywhere}.sync-help{font-size:11px;line-height:1.9;color:var(--muted);margin-top:23px}.sync-help summary{cursor:pointer;color:var(--accent)}.sync-help ol{padding-left:20px;margin:12px 0}.sync-help li{margin:8px 0}.sync-help strong{font-weight:500;color:var(--ink)}.reader-tools{display:flex;gap:18px;align-items:center}.bottom-nav .nav-item{width:100px}
/* The activity calendar records real visits and completed units, never time estimates. */
.reading-calendar{max-width:900px;margin:auto}.calendar-header{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:5px 0 24px}.calendar-header h2{font:500 30px/1.6 PaperSerif,"Songti SC",serif;margin:12px 0 0}.calendar-year-nav{display:flex;gap:8px}.calendar-year-nav button{width:35px;height:35px;background:var(--paper);border:1px solid var(--line);border-radius:9px;color:var(--accent)}.calendar-stats{display:flex;gap:25px;align-items:center;flex-wrap:wrap;border:1px solid var(--line);background:var(--paper);border-radius:12px;padding:23px 25px;margin-bottom:25px;font-size:11px;color:var(--muted)}.calendar-stats strong{font:29px Georgia,serif;color:var(--accent);margin-right:6px}.calendar-scroll{overflow-x:auto;overscroll-behavior-x:contain;background:var(--paper);padding:22px 23px;border:1px solid var(--line);border-radius:13px;scrollbar-width:thin}.calendar-months,.calendar-grid{display:grid;gap:4px;min-width:max-content}.calendar-months{font-size:9px;color:var(--muted);height:20px;line-height:12px;margin-bottom:6px}.calendar-months span{white-space:nowrap}.calendar-cell{display:block;width:12px;height:12px;padding:0;border:1px solid color-mix(in srgb,var(--ink),transparent 95%);border-radius:3px;background:var(--line)}.calendar-cell.empty{background:none;border:0;visibility:hidden}.calendar-cell.level-0{background:color-mix(in srgb,var(--line),var(--paper) 30%)}.calendar-cell.level-1{background:#c4ddc7}.calendar-cell.level-2{background:#87b99b}.calendar-cell.level-3{background:#4c9472}.calendar-cell.level-4{background:#20654f}.calendar-cell.today{outline:1px solid var(--gold);outline-offset:2px}.calendar-cell.selected{outline:2px solid var(--accent);outline-offset:2px}.calendar-cell:disabled{opacity:.35}.calendar-legend{display:flex;align-items:center;gap:5px;color:var(--muted);font-size:10px;margin:15px 2px 31px;flex-wrap:wrap}.calendar-legend>span:first-child{margin-right:3px}.calendar-legend>span:last-child{margin-left:3px}.calendar-detail{margin-top:23px}.calendar-detail>h3{font:500 21px/1.6 PaperSerif,"Songti SC",serif;margin:0 0 9px}.calendar-detail>p{color:var(--muted);font-size:12px;line-height:1.8;margin-bottom:22px}.calendar-paper{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:22px 24px;margin-bottom:13px}.calendar-paper h4{font:600 19px/1.6 PaperSerif,"Songti SC",serif;margin:0 0 12px;overflow-wrap:anywhere}.calendar-paper p{font-size:12px;line-height:1.9;color:var(--accent);margin:7px 0}.calendar-paper .calendar-last{color:var(--muted);font-size:11px}.calendar-paper ul{list-style:none;margin:17px 0 0;padding:0}.calendar-paper li{display:flex;justify-content:space-between;gap:20px;padding:11px 0;border-top:1px solid var(--line);font-size:12px;line-height:1.8}.calendar-paper li span{font-size:10px;color:var(--muted);white-space:nowrap;align-self:center}
/* Questions are private; only the backend has access to the model key. */
.ai-context{margin-bottom:18px}.ai-context p{font:500 18px/1.7 PaperSerif,"Songti SC",serif;margin:10px 0}.ai-prompts{display:flex;gap:7px;flex-wrap:wrap;margin:18px 0 23px}.ai-prompts .quiet-button{border:1px solid var(--line);border-radius:6px;padding:8px 11px;background:var(--bg);font-size:11px;color:var(--accent)}.ai-question-label{display:block;font-size:11px;color:var(--muted);margin-bottom:8px}#ai-question{display:block;width:100%;resize:vertical;background:var(--bg);border:1px solid var(--line);border-radius:9px;padding:14px;color:var(--ink);font:14px/1.8 -apple-system,"PingFang SC",sans-serif;min-height:120px;outline:none}#ai-question:focus{border-color:var(--accent)}.ai-controls{display:flex;align-items:center;gap:20px;margin-top:15px}.ai-controls .primary-button{font-size:12px}.ai-error,.ai-status,.ai-setup{font-size:12px;line-height:1.9;margin:19px 0;color:var(--muted);padding:14px;background:var(--bg);border:1px solid var(--line);border-radius:8px}.ai-error{color:#ad724e;border-color:color-mix(in srgb,var(--gold),transparent 50%)}.ai-answer{border-top:1px solid var(--line);padding-top:23px;margin-top:27px}.ai-answer>h3{font:500 18px/1.7 PaperSerif,"Songti SC",serif;margin:0 0 20px;overflow-wrap:anywhere}.ai-answer>p{font-size:12px;line-height:1.9;color:var(--muted)}.ai-answer .ai-answer-meta{font-size:10px;margin-top:20px}.ai-history{margin-top:28px;border-top:1px solid var(--line);padding-top:22px}.ai-history h3{font-size:12px;font-weight:500;color:var(--muted);margin:0 0 14px}.ai-history-row{display:flex;width:100%;justify-content:space-between;gap:20px;align-items:center;text-align:left;border:1px solid var(--line);padding:13px 14px;border-radius:8px;margin-bottom:7px;background:var(--bg);font-size:12px;line-height:1.7}.ai-history-row span{overflow-wrap:anywhere}.ai-history-row small{font-size:9px;white-space:nowrap;color:var(--muted)}.ai-history-row.selected{border-color:var(--accent);color:var(--accent)}:root[data-theme=dark] .calendar-cell.level-1{background:#334e3e}:root[data-theme=dark] .calendar-cell.level-2{background:#427b58}:root[data-theme=dark] .calendar-cell.level-3{background:#61ab78}:root[data-theme=dark] .calendar-cell.level-4{background:#a0d9a0}
@media(max-width:700px){.bottom-nav .nav-item{width:20%}.reader-tools{gap:13px}.sync-panel{padding:22px 19px;margin:24px 0;border-radius:12px}.sync-panel h2{font-size:22px}.sync-description{font-size:11px}.sync-status{font-size:11px;padding:12px 13px}.sync-status small{font-size:9px}.sync-buttons{gap:15px}.sync-buttons .primary-button{font-size:11px}.sync-buttons .quiet-button{font-size:10px}.sync-privacy{font-size:9px}.sync-help{font-size:10px}.calendar-header{margin:4px 0 20px}.calendar-header h2{font-size:26px}.calendar-header .eyebrow{font-size:9px}.calendar-stats{padding:20px;gap:14px 20px;font-size:10px}.calendar-stats strong{font-size:27px}.calendar-scroll{padding:19px 16px;margin-left:-3px;margin-right:-3px}.calendar-legend{font-size:9px;gap:4px}.calendar-legend .calendar-cell{width:10px;height:10px}.calendar-detail>h3{font-size:20px}.calendar-detail>p{font-size:11px}.calendar-paper{padding:19px}.calendar-paper h4{font-size:18px}.calendar-paper p{font-size:11px}.calendar-paper li{font-size:11px;gap:12px}.calendar-paper li span{font-size:9px}.ai-context p{font-size:17px}.ai-prompts .quiet-button{font-size:10px;padding:8px 9px}.ai-controls{gap:15px}.ai-controls .primary-button{font-size:11px}.ai-controls .quiet-button{font-size:10px}.ai-history-row{font-size:11px;gap:12px}.ai-answer>h3{font-size:17px}.ai-answer>p{font-size:11px}}

/* One continuous article, with unit-level progress and a persistent reading dock. */
.reading-unit{padding-top:30px;margin-top:36px;border-top:1px solid var(--line);scroll-margin-top:100px;min-width:0}
.reading-unit:first-of-type{margin-top:12px}
.unit-kicker{color:var(--muted);font:10px/1.5 ui-monospace,SFMono-Regular,monospace;letter-spacing:1.6px;margin-bottom:15px}
.reading-unit .unit-end{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-bottom:20px}
.reading-unit .unit-end button{white-space:nowrap}
.reading-unit .reader-tools{flex-wrap:wrap;gap:12px}
.reader-guide{font-size:11px;color:var(--muted);line-height:1.8;margin:0 0 24px}
.is-reader .reader-dock{position:fixed;z-index:35;left:50%;transform:translateX(-50%);width:min(760px,calc(100% - 32px));margin:0;bottom:calc(var(--nav) + 12px)}
.is-reader #main{padding-bottom:200px}
.source-figure img[width][height],.sheet-image[width][height]{height:auto}
@media(max-width:700px){.reading-unit{padding-top:25px;margin-top:30px}.unit-kicker{font-size:9px}.reading-unit .reader-context{align-items:flex-start;flex-wrap:wrap;gap:12px}.reading-unit .reader-tools{gap:12px}.reading-unit .unit-end{font-size:10px}.is-reader .reader-dock{width:calc(100% - 24px);bottom:calc(var(--nav) + 9px)}.reader-guide{font-size:10px}}
@media print{.is-reader .reader-dock,.unit-kicker,.reader-guide,.reading-unit .unit-end{display:none}.reading-unit{break-before:auto}.is-reader #main{padding-bottom:0}}

/* On a wide screen, keep the reading column beside a persistent workbench. */
.reader-main{min-width:0}
.reader-side{display:none}
@media(min-width:1120px){
  body.is-reader{
    --reader-width:min(1600px,100vw);
    --reader-gutter:40px;
    --reader-gap:12px;
    --reader-rail-width:64px;
    --reader-tools-width:clamp(340px,32vw,480px);
  }
  body.is-reader .site-header{max-width:1600px;padding-left:40px;padding-right:40px}
  body.is-reader #main{max-width:1600px;padding:44px var(--reader-gutter) 200px}
  .reader-workspace{display:grid;grid-template-columns:minmax(0,1fr) var(--reader-rail-width) var(--reader-tools-width);gap:var(--reader-gap);align-items:start}
  .reader-main .reader-top,.reader-main .reader-content{max-width:820px}
  .reader-main .reader-top{margin-bottom:32px}
  .reader-main .reading-unit .original-block{display:none}
  .reader-main .reader-guide{max-width:640px}
  .is-reader .reader-dock{
    position:sticky;top:max(24px,calc(50dvh - 110px));left:auto;bottom:auto;
    transform:none;align-self:start;flex-direction:column;
    width:var(--reader-rail-width);max-width:none;margin:0;padding:6px;gap:6px;
    z-index:10;
  }
  .reader-dock .dock-button{width:100%;min-width:0;min-height:62px;flex-direction:column;gap:4px;padding:7px 2px;font-size:11px;line-height:1.3;white-space:normal}
  .reader-dock .dock-button.next{flex-direction:column-reverse;min-height:74px}
  .reader-dock .dock-next-line{display:block}
  .reader-dock .dock-button svg{width:17px;height:17px}
  .reader-dock .dock-index{flex:none;width:100%;min-height:54px;padding:5px 0;font-size:11px;line-height:1.3}
  .reader-dock .dock-index span{font-size:10px;letter-spacing:0;margin-top:4px}
  .reader-side{
    display:flex;flex-direction:column;position:sticky;top:24px;align-self:start;
    height:calc(100dvh - var(--reader-side-top,124px) - var(--nav) - 16px);
    max-height:calc(100dvh - 24px - var(--nav) - 16px);
    min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:16px;
    box-shadow:var(--shadow);overflow:hidden;overscroll-behavior-y:contain;
  }
  .reader-side-header{padding:14px 16px 12px;border-bottom:1px solid var(--line);flex-shrink:0;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}
  .reader-side-header>div:first-child{display:flex;align-items:baseline;gap:10px}
  .reader-side-header .eyebrow{display:block;font-size:8px;letter-spacing:1.2px;white-space:nowrap}
  .reader-side-header label{display:block;font:500 15px/1.5 PaperSerif,"Songti SC",serif;letter-spacing:.5px;color:var(--ink)}
  #reader-tool-select{
    position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
    clip:rect(0,0,0,0);clip-path:inset(50%);white-space:nowrap;border:0;
  }
  .tool-switcher{display:grid!important;grid-template-columns:repeat(4,minmax(0,1fr));gap:3px!important;width:100%;padding:4px;border:1px solid var(--line);border-radius:11px;background:var(--bg)}
  .tool-tab{display:flex;align-items:center;justify-content:center;gap:5px;min-width:0;min-height:35px;padding:7px 3px;border:1px solid transparent;border-radius:7px;color:var(--muted);font-size:11px;line-height:1.4;white-space:nowrap;transition:background .15s,color .15s,border-color .15s,box-shadow .15s}
  .tool-tab svg{width:14px;height:14px}
  .tool-tab:hover{color:var(--accent);background:color-mix(in srgb,var(--accent-soft),transparent 40%)}
  .tool-tab[aria-selected=true]{color:var(--accent);background:var(--paper);border-color:color-mix(in srgb,var(--accent),transparent 72%);box-shadow:0 1px 4px #132b1e0a;font-weight:600}
  .tool-tab:focus-visible{outline:2px solid var(--gold);outline-offset:2px;z-index:1}
  .reader-side-unit{padding:12px 17px;border-bottom:1px solid var(--line);font-size:11px;line-height:1.7;overflow-wrap:anywhere;color:var(--muted);flex-shrink:0}
  .reader-side-unit h2{font:600 15px/1.6 PaperSerif,"Songti SC",serif;margin:0;color:var(--ink);display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
  .reader-side-unit strong{font-weight:500;color:var(--ink)}
  .reader-side-unit small,.reader-side-unit .unit-kicker{font:10px/1.6 ui-monospace,SFMono-Regular,monospace;letter-spacing:1px;color:var(--muted)}
  .reader-side-unit .unit-kicker{margin-bottom:5px}
  .reader-side-unit p{margin:4px 0 0}
  .reader-side-context{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-top:7px;font-size:10px;line-height:1.8}
  .reader-side-context .quiet-button{font-size:10px;line-height:1.6;padding:5px 8px;border:1px solid var(--line);border-radius:6px;background:var(--accent-soft);color:var(--accent)}
  .reader-side-context .quiet-button svg{width:14px;height:14px}
  .reader-side-content{
    padding:18px 17px 22px;min-height:0;flex:1;overflow:auto;overscroll-behavior:contain;
    scrollbar-width:thin;scrollbar-color:var(--line) transparent;scroll-padding-top:20px;
  }
  .reader-side-content:focus-visible{outline:2px solid var(--accent);outline-offset:-4px}
  .reader-side-content .side-original{font-size:calc(var(--font) - 2px);line-height:1.95;letter-spacing:0}
  .reader-side-content .side-original pre{font-size:12px;padding:13px}
  .reader-side-content .side-original table{font-size:.8em}
  .reader-side-content .side-original th,.reader-side-content .side-original td{padding:8px 10px;min-width:60px}
  .reader-side-content .side-pages{min-width:0}
  .side-pages figure{margin:0 0 23px;padding:9px;border:1px solid var(--line);border-radius:10px;background:var(--bg)}
  .side-pages figure:last-child{margin-bottom:0}
  .side-pages figure img{display:block;width:100%;max-width:100%;height:auto;border-radius:4px;background:white}
  .side-pages figure button{display:block;width:100%;padding:0;cursor:zoom-in}
  .side-pages figcaption{font-size:10px;line-height:1.8;color:var(--muted);margin:10px 4px 2px;overflow-wrap:anywhere}
  .reader-side-content .unit-list{gap:5px;margin:-7px -7px 0}
  .reader-side-content .unit-list a{font-size:12px;gap:11px;padding:13px 10px;border:1px solid transparent}
  .reader-side-content .unit-list a:hover{border-color:var(--line)}
  .reader-side-content .unit-list a.selected{border-color:color-mix(in srgb,var(--accent),transparent 80%)}
  .reader-side-content .unit-list .unit-no{font-size:11px;min-width:22px}
  .reader-side-content .empty-state{padding:35px 12px;font-size:12px}
  .reader-side-content .empty-state h2{font-size:18px}
  .reader-side-content .reader-guide,.reader-side-content .page-lead{font-size:11px;line-height:1.9}
  .reader-side-content .ai-panel{min-width:0}
  .reader-side-content .ai-context p{font-size:17px;line-height:1.75}
  .reader-side-content .ai-prompts{gap:6px;margin:15px 0 21px}
  .reader-side-content .ai-prompts .quiet-button{padding:7px 9px;font-size:10px}
  .reader-side-content #ai-question{font-size:13px;line-height:1.85;padding:12px;min-height:132px}
  .reader-side-content .ai-controls{gap:13px;flex-wrap:wrap}
  .reader-side-content .ai-controls .primary-button{padding:12px 14px;font-size:11px}
  .reader-side-content .ai-controls .quiet-button{font-size:11px}
  .reader-side-content .ai-setup,.reader-side-content .ai-status,.reader-side-content .ai-error{font-size:11px;line-height:1.9;padding:13px}
  .reader-side-content .ai-answer{margin-top:23px;padding-top:21px}
  .reader-side-content .ai-answer>h3{font-size:17px;line-height:1.8}
  .reader-side-content .ai-answer .prose{font-size:15px;line-height:1.95;letter-spacing:0}
  .reader-side-content .ai-answer .prose pre{font-size:11px;padding:12px}
  .reader-side-content .ai-history-row{font-size:11px;gap:10px;padding:11px 12px;align-items:start}
  .reader-side-content .ai-history-row small{padding-top:3px}
  .reader-side-content .settings-note{font-size:10px;line-height:1.9;margin:16px 0}
}
@media print{
  .reader-workspace{display:block}
  .reader-side{display:none!important}
  .reader-main .reading-unit .original-block{display:block}
  .reader-main .reader-content{max-width:none}
}

@media(min-width:1120px){.reader-main .reading-unit>.source-figure{display:none}}
@media print{.reader-main .reading-unit>.source-figure{display:block}}

/* A selection stays tied to its source unit while the question is composed. */
.selection-ask{position:fixed;z-index:38;display:flex;align-items:center;justify-content:center;gap:7px;padding:11px 15px;max-width:calc(100vw - 24px);min-height:40px;border:1px solid color-mix(in srgb,var(--accent),var(--paper) 28%);border-radius:10px;background:var(--accent);color:var(--paper);box-shadow:0 5px 22px #14231b30;font-size:12px;font-weight:600;line-height:1.4;white-space:nowrap;animation:sheetIn .12s ease-out}
.selection-ask svg{width:16px;height:16px}
.selection-ask:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
.ai-connection-status{font-size:10px;line-height:1.7;color:var(--muted);margin:0 0 12px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.ai-connection-status .quiet-button{font-size:10px;padding:2px 0;color:var(--accent)}
.ai-selection{margin:0 0 12px;padding:10px 12px;border:1px solid color-mix(in srgb,var(--accent),transparent 72%);border-left:3px solid var(--accent);border-radius:7px;background:var(--accent-soft);font-size:12px;line-height:1.75;color:var(--ink);overflow-wrap:anywhere}
.ai-selection blockquote{margin:6px 0 0;max-height:7em;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;white-space:pre-wrap;font:12px/1.75 PaperSerif,"Songti SC",serif}
.ai-selection-header,.ai-selection>div:first-child{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:10px;color:var(--accent)}
.ai-selection .quiet-button{padding:0;font-size:10px;color:var(--accent);flex-shrink:0}
.ai-parent-context{display:flex;align-items:start;justify-content:space-between;gap:10px;font-size:11px;line-height:1.8;padding:8px 11px;margin:0 0 12px;border-left:2px solid var(--line);color:var(--muted);overflow-wrap:anywhere}
.ai-parent-context>span{min-width:0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.ai-parent-context .quiet-button{flex-shrink:0;font-size:10px;padding:0;color:var(--accent)}
.ai-parent-context strong{font-weight:500;color:var(--ink)}
.ai-conversation{min-width:0}
.ai-composer{min-width:0}
.ai-composer .ai-prompts{margin:0 0 13px}
.ai-composer .ai-controls{justify-content:space-between;gap:10px;flex-wrap:wrap}
.ai-composer .ai-controls .primary-button{gap:7px}
.ai-composer .ai-controls small{color:var(--muted);font-size:10px}
.ai-message{overflow-wrap:anywhere}
.ai-message .prose{font-size:15px}
.ai-connect-form{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:10px 0 13px}
.ai-connect-form>h3{flex-basis:100%;margin:0;font:500 16px/1.7 PaperSerif,"Songti SC",serif}
.ai-connect-form>p{width:100%}
.ai-connect-form .ai-setup{margin:0;padding:0;border:0;background:none;font-size:11px;line-height:1.8}
.ai-connect-form>.ai-controls{flex-basis:100%;margin-top:0;gap:12px;flex-wrap:wrap}
.ai-connect-form label{width:100%;font-size:11px;color:var(--muted);line-height:1.7}
.ai-connect-form input{flex:1;min-width:120px;width:100%;border:1px solid var(--line);border-radius:8px;background:var(--bg);padding:11px 12px;color:var(--ink);font:12px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;outline:none}
.ai-connect-form input:focus{border-color:var(--accent)}
.ai-connect-form .primary-button{font-size:11px;padding:11px 13px}
.ai-connect,.ai-composer .settings-note{font-size:10px;line-height:1.8;color:var(--muted);margin:10px 0}
.ai-sheet{height:min(800px,calc(100dvh - 60px));max-height:calc(100dvh - 60px)}
.ai-sheet .sheet-body{display:flex;flex:1;min-height:0;padding:0;overflow:hidden}
.ai-sheet #ai-panel,.ai-sheet .ai-panel{display:flex;flex:1;flex-direction:column;min-height:0;min-width:0;overflow:hidden}
.ai-sheet .ai-context{flex:none;margin:0;padding:10px 20px 7px;border-bottom:1px solid var(--line)}
.ai-sheet .ai-context .eyebrow{display:none}
.ai-sheet .ai-context p{font-size:12px;line-height:1.5;margin:0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:1;overflow:hidden}
.ai-sheet .ai-conversation{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;padding:0 20px 16px}
.ai-sheet .ai-conversation .ai-answer:first-child{margin-top:0;padding-top:12px;border-top:0}
.ai-sheet .ai-conversation .ai-history{margin-top:18px;padding-top:15px}
.ai-sheet .ai-conversation .ai-history-row{padding:10px 11px}
.ai-sheet .ai-composer{flex:none;max-height:min(50%,350px);min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;padding:12px 20px 16px;border-top:1px solid var(--line);background:var(--paper)}
.ai-sheet .ai-composer .ai-prompts{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;gap:6px;margin:0 0 9px}
.ai-sheet .ai-composer .ai-prompts::-webkit-scrollbar{display:none}
.ai-sheet .ai-composer .ai-prompts .quiet-button{flex:none;white-space:nowrap;padding:6px 9px}
.ai-sheet .ai-composer #ai-question{height:82px;min-height:70px;padding:10px 11px;font-size:16px;line-height:1.5;resize:none}
.ai-sheet .ai-composer .ai-controls{margin-top:9px}
.ai-sheet .ai-composer .settings-note{margin:7px 0 0}
.ai-sheet .ai-composer .ai-selection blockquote{max-height:2.6em}
@media(min-width:1120px){
  .reader-side-content:has(>.ai-panel){display:flex;flex-direction:column;padding:0;overflow:hidden}
  .reader-side-content>.ai-panel{display:flex;flex-direction:column;flex:1;min-width:0;min-height:0;overflow:hidden}
  .reader-side-content .ai-panel>.ai-context{display:none}
  .reader-side-content .ai-context>.eyebrow{font-size:8px;letter-spacing:1.3px}
  .reader-side-content .ai-context p{font-size:14px;line-height:1.65;margin:5px 0 8px}
  .reader-side-content .ai-panel>.ai-connection-status{padding:0 17px 10px;margin:0;flex-shrink:0}
  .reader-side-content .ai-conversation{flex:1;min-height:0;padding:0 17px 17px;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--line) transparent;scroll-padding-top:12px}
  .reader-side-content .ai-conversation:empty{padding-bottom:0}
  .reader-side-content .ai-conversation .ai-answer:first-child{margin-top:0;padding-top:5px;border-top:0}
  .reader-side-content .ai-conversation .ai-answer>h3{font-size:14px;line-height:1.8;margin-bottom:14px}
  .reader-side-content .ai-conversation .ai-answer .prose{font-size:14px;line-height:1.9}
  .reader-side-content .ai-conversation .ai-history{margin-top:18px;padding-top:16px}
  .reader-side-content .ai-conversation .ai-history h3{font-size:10px;margin-bottom:10px}
  .reader-side-content .ai-conversation .ai-history-row{font-size:10px;padding:9px 10px}
  .reader-side-content .ai-composer{flex-shrink:0;max-height:calc(100% - 56px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;padding:13px 17px 15px;border-top:1px solid var(--line);background:var(--paper);box-shadow:0 -5px 15px #162c1e04}
  .reader-side-content .ai-panel:has(.ai-connect-form) .ai-composer{max-height:52%}
  .reader-side-content .ai-composer .ai-prompts{gap:5px;margin:0 0 10px}
  .reader-side-content .ai-composer .ai-prompts .quiet-button{font-size:10px;padding:6px 8px}
  .reader-side-content .ai-composer .ai-question-label{font-size:10px;margin-bottom:7px}
  .reader-side-content .ai-composer #ai-question{font-size:13px;line-height:1.75;height:98px;min-height:70px;max-height:min(180px,22dvh);padding:10px 11px;resize:vertical}
  .reader-side-content .ai-composer .ai-controls{margin-top:10px;gap:10px}
  .reader-side-content .ai-composer .ai-controls .primary-button{padding:10px 12px;font-size:11px}
  .reader-side-content .ai-composer .ai-controls .quiet-button{font-size:10px}
  .reader-side-content .ai-composer .ai-selection{font-size:11px;padding:8px 10px;margin-bottom:10px}
  .reader-side-content .ai-composer .ai-selection blockquote{font-size:11px;max-height:5.3em}
  .reader-side-content .ai-composer .ai-parent-context{font-size:10px;padding:6px 9px;margin-bottom:10px}
  .reader-side-content .ai-composer .ai-error,.reader-side-content .ai-composer .ai-status,.reader-side-content .ai-composer .ai-setup{font-size:10px;margin:9px 0;padding:9px 10px;line-height:1.7;max-height:6em;overflow:auto}
  .reader-side-content .ai-composer .ai-connect-form{margin:8px 0 10px;gap:7px}
  .reader-side-content .ai-composer .ai-connect-form input{font-size:11px;padding:9px 10px}
  .reader-side-content .ai-composer .ai-connect-form .primary-button{font-size:10px;padding:10px}
  .reader-side-content .ai-composer .settings-note{font-size:9px;margin:8px 0;line-height:1.7}
  .reader-side-content .ai-connect-form>h3{font-size:14px}
  .reader-side-content .ai-connect-form .ai-setup{font-size:10px;margin:0;padding:0;border:0}
  .reader-side-content .ai-connect-form>.settings-note{font-size:9px;margin:0;line-height:1.7}
}
@media(min-width:1120px) and (max-height:760px){
  .reader-side-header{padding:10px 13px;gap:8px}
  .reader-side-header .eyebrow{display:none}
  .reader-side-unit{padding:10px 14px}
  .reader-side-context{margin-top:4px}
  .reader-side-content .ai-panel>.ai-context{display:none}
  .reader-side-content .ai-panel>.ai-connection-status{padding-top:8px;padding-bottom:8px}
  .reader-side-content .ai-composer{padding:10px 14px}
  .reader-side-content .ai-composer #ai-question{height:76px;min-height:60px;max-height:110px}
  .reader-side-content .ai-composer .ai-prompts{gap:4px;margin-bottom:8px}
  .reader-side-content .ai-composer .ai-prompts .quiet-button{padding:5px 7px;font-size:9px}
}
@media(min-width:1120px) and (max-height:640px){
  .reader-side-content:has(>.ai-panel){overflow:auto}
  .reader-side-content>.ai-panel{flex:none;min-height:100%;overflow:visible}
  .reader-side-content .ai-conversation{flex:none;min-height:0;max-height:35dvh}
  .reader-side-content .ai-composer{max-height:none;overflow:visible}
  .reader-side-content .ai-panel:has(.ai-connect-form) .ai-composer{max-height:none}
}
@media(max-width:700px){
  .ai-sheet{height:88dvh;max-height:88dvh}
  .ai-sheet .ai-context{padding:8px 16px 6px}
  .ai-sheet .ai-conversation{padding:0 16px 12px}
  .ai-sheet .ai-composer{padding:10px 16px 10px}
  .ai-sheet .ai-composer .settings-note{display:none}
  .selection-ask{font-size:12px;min-height:44px;padding:11px 14px;border-radius:9px}
  .ai-connect-form{gap:8px}
  .ai-connect-form input{min-width:130px}
  .ai-selection{font-size:11px;padding:9px 11px}
  .ai-selection blockquote{font-size:12px;max-height:8em}
}
@media(max-height:640px){
  .ai-sheet .ai-composer{max-height:62%}
  .ai-sheet .ai-composer .ai-prompts{display:none}
  .ai-sheet .ai-composer #ai-question{height:66px;min-height:60px}
  .ai-sheet .ai-composer .ai-selection blockquote{max-height:1.5em}
  .ai-sheet .ai-composer .settings-note{display:none}
}
@media print{.selection-ask{display:none!important}}

/* The library and personal pages share the same spacious desktop shell. */
@media screen{
  .home-intro{min-width:0}
  .home-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:27px 0 0;max-width:380px}
  .home-stats>div{min-width:0}
  .home-stats dt{font-size:11px;line-height:1.6;color:var(--muted)}
  .home-stats dd{margin:5px 0 0;font:29px/1.2 Georgia,serif;color:var(--accent);letter-spacing:-.5px}
  .home-stats dd span{font:10px/1.5 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;color:var(--muted);letter-spacing:0;margin-left:6px}
  .paper-card{display:flex;flex-direction:column}
  .paper-card-link{display:flex;flex-direction:column;flex:1;min-width:0}
  .paper-card .paper-summary{margin-bottom:23px}
  .paper-card-footer{margin-top:auto;flex-wrap:wrap;gap:8px 12px;line-height:1.7}
  .paper-card-top .pill{max-width:55%;overflow:hidden;text-overflow:ellipsis}
  .paper-card-top .eyebrow{min-width:0;line-height:1.6}
  .paper-grid>.empty-state,#bookmark-results>.empty-state,#term-results>.empty-state{grid-column:1/-1}
  .page-lead{max-width:68ch}
  .settings-layout>div,.settings-layout>.settings-account{min-width:0}
  .reading-calendar{--calendar-cell-size:12px}
  .calendar-grid .calendar-cell{width:var(--calendar-cell-size);height:var(--calendar-cell-size)}
  .calendar-overview{min-width:0}
  .calendar-papers{display:grid;gap:14px;align-items:start}
  .calendar-papers .calendar-paper{margin-bottom:0;min-width:0}
}
@media screen and (min-width:1120px){
  body:not(.is-reader){--site-gutter:clamp(32px,3vw,48px)}
  body:not(.is-reader) .site-header{max-width:1600px;padding-left:var(--site-gutter);padding-right:var(--site-gutter)}
  body:not(.is-reader) #main{max-width:1600px;padding:44px var(--site-gutter) 130px}
  .home-intro{display:grid;grid-template-columns:minmax(0,.75fr) minmax(0,1.65fr);gap:clamp(32px,4vw,64px);align-items:stretch}
  .home-intro .hero{padding:16px 0 12px;align-items:flex-start;gap:20px}
  .home-intro .hero>div:first-child{min-width:0;align-self:center}
  .home-intro .hero h1{font-size:clamp(32px,2.6vw,40px);line-height:1.5;margin-top:17px;margin-bottom:16px}
  .home-intro .hero .mobile-break{display:block}
  .home-intro .hero p{font-size:13px;max-width:27em;line-height:1.95}
  .home-intro .hero .eyebrow{font-size:9px;letter-spacing:1.4px;line-height:1.8}
  .home-intro .hero-stamp{display:none}
  .home-stats{padding-top:23px;margin-top:26px;border-top:1px solid var(--line);gap:20px;max-width:330px}
  .home-stats dd{font-size:32px}
  .home-intro .today-card{grid-template-columns:minmax(0,1fr);gap:23px;padding:29px 32px;min-width:0}
  .home-intro .today-card h2{font-size:clamp(24px,1.9vw,29px);line-height:1.5;max-width:30em}
  .home-intro .today-card>.today-action{border-left:0;border-top:1px solid var(--line);padding:21px 0 0;flex-direction:row;justify-content:space-between;align-items:center;gap:18px}
  .home-intro .today-action .reading-count{font-size:31px;letter-spacing:-1px}
  .home-intro .today-action .tiny-label{font-size:10px;margin-top:7px}
  .home-intro .today-action .primary-button{flex-shrink:0}
  .home-intro .today-card .paper-summary{font-size:13px;line-height:1.95;-webkit-line-clamp:3}
  .home-intro .today-meta{font-size:11px;gap:10px 17px;margin-top:18px}
  body[data-page=home] .section-heading{margin-top:42px}
  .library-tools{gap:18px;margin-bottom:24px;align-items:center}
  .library-tools .search-box{width:320px;flex-shrink:0}
  .library-tools .filters{gap:8px}
  .paper-grid{gap:20px}
  .paper-card{padding:25px}
  .paper-card h3{font-size:21px;line-height:1.6}
  .paper-card .paper-summary{font-size:13px;line-height:1.9;-webkit-line-clamp:3}
  .paper-card-footer{padding-top:4px;font-size:11px}
  .paper-card .card-progress{margin-top:17px}
  #bookmark-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
  #bookmark-results .bookmark-card{margin-bottom:0;min-width:0;padding:23px;align-items:flex-start}
  #bookmark-results .bookmark-card .icon-button{align-self:center}
  #bookmark-results .bookmark-card p{line-height:1.8;overflow-wrap:anywhere}
  #term-results{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
  #term-results .term-row{padding:20px;min-height:96px}
  .glossary-tools{max-width:560px;margin-top:30px;margin-bottom:26px}
  .settings-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:36px;align-items:start;margin-top:32px}
  .settings-layout .settings-panel,.settings-layout .font-preview,.settings-layout .settings-note,.settings-layout .sync-panel{max-width:none}
  .settings-layout .settings-panel{margin-top:0;margin-bottom:24px}
  .settings-layout .font-preview{padding:26px 28px}
  .settings-layout .font-preview .prose{font-size:var(--font);max-width:38em}
  .settings-layout .settings-note{max-width:65ch;margin-top:22px}
  .settings-account .sync-panel{margin:0 0 24px;padding:27px 29px}
  .settings-layout .setting-row{gap:16px;flex-wrap:wrap;padding:24px}
  .settings-layout .setting-copy{min-width:0}
  .settings-layout .segmented{margin-left:auto}
  .reading-calendar{max-width:none}
  .calendar-header{grid-column:1/-1;margin:5px 0 30px}
  .calendar-overview{--calendar-cell-size:clamp(12px,.85vw,15px)}
  .calendar-overview .calendar-stats{padding:24px;gap:20px 25px;margin-bottom:24px}
  .calendar-overview .calendar-stats>span{line-height:1.7}
  .calendar-overview .calendar-scroll{margin:0;padding:25px 22px}
  .calendar-overview .calendar-months{margin-bottom:10px}
  .calendar-overview .calendar-legend{margin-bottom:0;line-height:1.8}
  .reading-calendar>.calendar-detail{margin-top:30px;min-width:0;padding-top:4px}
  .reading-calendar>.calendar-detail>h3{font-size:22px;margin-bottom:13px}
  .reading-calendar>.calendar-detail>p{margin-top:0}
  .reading-calendar .calendar-paper{padding:23px}
  .reading-calendar .calendar-paper h4{font-size:19px}
  .calendar-papers{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
  .calendar-papers:has(>.calendar-paper:only-child){grid-template-columns:minmax(0,900px)}
  body:not(.is-reader) .page-foot{margin-top:48px;padding-top:22px}
}
@media screen and (min-width:1360px){
  .paper-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
  #term-results{grid-template-columns:repeat(4,minmax(0,1fr))}
  .settings-layout{grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:44px}
}
@media screen and (min-width:1440px){
  .calendar-overview{display:grid;grid-template-columns:220px minmax(0,1fr);gap:0 28px;align-items:start;--calendar-cell-size:clamp(14px,1vw,16px)}
  .calendar-overview .calendar-stats{grid-row:1/3;display:grid;grid-template-columns:1fr;gap:15px;padding:25px 24px;margin:0}
  .calendar-overview .calendar-stats>span:last-child{padding-top:7px;border-top:1px solid var(--line)}
  .calendar-overview .calendar-scroll{grid-column:2;grid-row:1}
  .calendar-overview .calendar-legend{grid-column:2;grid-row:2;margin-top:14px}
  .reading-calendar>.calendar-detail{margin-top:34px}
  .calendar-papers{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
}
@media screen and (min-width:1500px){
  .home-intro{grid-template-columns:minmax(0,.7fr) minmax(0,1.7fr);gap:56px}
  .home-intro .today-card{grid-template-columns:minmax(0,1fr) 171px;gap:28px;padding:34px}
  .home-intro .today-card>.today-action{border-top:0;border-left:1px solid var(--line);padding:0 0 0 26px;flex-direction:column;justify-content:center;align-items:flex-start;gap:24px}
  .home-intro .today-action .reading-count{font-size:38px}
  .home-intro .today-action .reading-count small{display:block;font-size:11px;margin:10px 0 0;line-height:1.5}
  .home-intro .today-action .tiny-label{max-width:12em;line-height:1.8}
  .home-intro .today-card h2{font-size:28px}
  .paper-card{padding:27px}
}
@media screen and (max-width:700px){
  .home-stats{gap:21px;margin-top:22px;max-width:300px}
  .home-stats dt{font-size:10px}
  .home-stats dd{font-size:25px}
  .paper-card .paper-summary{margin-bottom:18px}
}