@font-face{font-family:Geist;src:url('assets/geist-latin.woff2') format('woff2');font-style:normal;font-weight:400 700;font-display:swap}
:root{--page:#f5f6f3;--surface:#fff;--soft:#f1f4ee;--ink:#24342c;--secondary:#5d6c62;--green:#285840;--green-hover:#1c4630;--green-soft:#e8efe4;--line:#e1e6dc;--line-strong:#cdd7c6;--warning:#faf5e9;--warning-ink:#74542c;--radius:12px;--font:Geist,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--page);color:var(--ink);font:15px/1.7 var(--font);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button{color:inherit;cursor:pointer}button,a,summary{touch-action:manipulation}button,a,summary{transition:background-color .16s,color .16s,border-color .16s}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #85a36d;outline-offset:3px}button{border:0}button:hover{color:var(--green)}button:active{transform:translateY(1px)}button:disabled{opacity:.45;cursor:default}::selection{background:#d7e5c9}h1,h2,h3,h4,p{margin:0}h1,h2,h3{text-wrap:balance}p{text-wrap:pretty}[hidden]{display:none!important}.icon{display:inline-block;width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;vertical-align:middle}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:12px;left:16px;z-index:99;padding:12px 18px;background:var(--green);color:white;border-radius:6px;transform:translateY(-200%)}.skip-link:focus{transform:none}.app-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.header-inner{max-width:1480px;margin:auto;padding:0 42px;height:78px;display:flex;align-items:center;gap:50px}.brand{display:inline-flex;align-items:center;gap:11px;white-space:nowrap;font-size:18px;font-weight:600;letter-spacing:-.5px}.brand-mark{display:inline-flex;align-items:baseline;justify-content:center;width:35px;height:37px;border-radius:9px 9px 9px 2px;background:var(--green);color:white;font-size:28px;line-height:35px;letter-spacing:-2px;padding-right:3px}.brand-mark span{color:#c4d8ad;margin-left:2px;font-size:25px}.study-nav{display:flex;gap:6px;min-width:0}.nav-item{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 15px;border-radius:6px;font-size:13px;color:var(--secondary);white-space:nowrap}.nav-item.active{background:var(--green-soft);color:var(--green);font-weight:600}.nav-item:hover{background:var(--soft)}.nav-item .icon{width:17px;height:17px}.nav-item b,.filter-tabs b{font-size:10px;font-weight:500;padding:1px 5px;border-radius:4px;background:#dce8d6}.search-open{margin-left:auto;display:flex;align-items:center;gap:9px;padding:0 12px;height:44px;background:transparent;color:var(--secondary);font-size:13px;border-radius:6px}.search-open:hover{background:var(--soft)}kbd{font:11px var(--font);border:1px solid var(--line);padding:1px 6px;border-radius:4px;color:var(--secondary)}.workspace{max-width:1480px;padding:0 42px;margin:auto}.workspace-intro{display:flex;align-items:center;justify-content:space-between;gap:30px;padding:36px 0 29px}.breadcrumb{display:flex;gap:12px;color:var(--secondary);font-size:12px}.breadcrumb span:first-child{letter-spacing:1px}.breadcrumb span:nth-child(2){color:#9ca796}h1{font-size:30px;line-height:1.4;font-weight:600;letter-spacing:-.7px;margin:10px 0 9px}.title-slash{color:#b2bdab;font-weight:400;padding:0 3px}.intro-description{font-size:13px;color:var(--secondary)}.study-summary{width:285px;flex-shrink:0;padding-left:28px;border-left:1px solid var(--line-strong)}.summary-numbers{display:flex;gap:25px}.summary-numbers>div{display:flex;gap:8px;align-items:baseline;white-space:nowrap}.summary-numbers strong{font-size:27px;font-weight:500;letter-spacing:-1px;line-height:1.25;font-variant-numeric:tabular-nums}.summary-numbers small{font-size:12px;color:var(--secondary);letter-spacing:0;font-weight:400}.summary-numbers>div>span{font-size:11px;color:var(--secondary)}.progress-line{display:flex;justify-content:space-between;font-size:11px;color:var(--secondary);margin:14px 0 7px}.progress-line b{font-weight:500;color:var(--green)}.progress-track{height:4px;border-radius:2px;background:#e0e7da;overflow:hidden}.progress-track i{display:block;height:100%;width:0;background:var(--green);transition:width .2s}.overview-bar{display:flex;align-items:center;gap:32px;border-top:1px solid var(--line-strong);border-bottom:1px solid var(--line);padding:15px 0;font-size:12px;color:var(--secondary)}.overview-bar b{font-weight:500;font-size:17px;color:var(--ink);margin-right:7px}.overview-tip{margin-left:auto;letter-spacing:.7px}.home-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;margin:28px 0}.section-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:18px}.section-heading h2{font-size:17px;font-weight:600}.section-heading>span{font-size:11px;color:var(--secondary)}.chapter-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.chapter-card{border:1px solid var(--line);background:white;border-radius:10px;padding:23px 25px 0;min-width:0;transition:border-color .16s,box-shadow .16s}.chapter-card:hover{border-color:#91aa7c;box-shadow:0 4px 15px #24342c06}.card-top{display:flex;align-items:center;gap:12px;font-size:11px;color:var(--secondary)}.chapter-number{font-variant-numeric:tabular-nums;font-size:12px;font-weight:500;color:var(--green)}.card-top>.chapter-number{font-size:15px}.card-status{margin-left:auto;font-size:10px;padding:2px 7px;border:1px solid var(--line);border-radius:4px;color:var(--secondary)}.card-status.done{background:var(--green-soft);color:var(--green);border-color:transparent}.chapter-card h2{font-size:22px;font-weight:600;margin:15px 0 8px;letter-spacing:-.4px}.chapter-card p{font-size:12px;color:var(--secondary)}.tags{display:flex;flex-wrap:wrap;gap:6px;margin:18px 0 23px}.tags span{font-size:10px;border-radius:4px;background:var(--soft);padding:3px 7px;color:var(--secondary)}.card-bottom{border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:12px 0;font-size:11px;color:var(--green)}.card-bottom .icon{width:17px}.focus-panel{border:1px solid var(--line);border-radius:10px;background:#edf1e8;padding:26px 24px;align-self:end}.eyebrow{font-size:10px;font-weight:500;letter-spacing:1.2px;color:var(--secondary);margin:0 0 14px}.focus-panel h2{font-size:21px;font-weight:500;letter-spacing:-.5px;margin-bottom:24px}.focus-step{display:flex;gap:13px;margin:0 0 24px}.focus-step>span{font-size:11px;font-weight:500;border:1px solid var(--line-strong);border-radius:50%;width:24px;height:24px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.focus-step strong{font-size:12px;font-weight:600}.focus-step p{font-size:11px;color:var(--secondary);margin-top:4px}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;padding:10px 18px;border-radius:6px;font-size:12px;font-weight:500}.primary{background:var(--green);color:white}.primary:hover{background:var(--green-hover);color:white}.secondary{border:1px solid var(--line-strong);background:transparent;color:var(--green)}.secondary:hover{background:var(--green-soft)}.full{display:flex;width:100%;margin-top:10px}.panel-note{font-size:10px;color:var(--secondary);margin-top:15px;line-height:1.9}.paper{background:white;border:1px solid var(--line);border-radius:10px;padding:34px 38px;min-width:0}.home-notes{padding:8px 35px 30px}.home-notes>h2{margin-top:30px}.prose{font-size:15px;line-height:1.95;overflow-wrap:break-word}.prose p{margin:13px 0}.prose h2{font-size:22px;font-weight:600;letter-spacing:-.4px;margin:40px 0 18px;line-height:1.6;scroll-margin-top:100px}.prose h2:first-child{margin-top:0}.prose h3{font-size:17px;font-weight:600;margin:28px 0 12px;line-height:1.7}.prose h4{font-size:15px;font-weight:600;margin:24px 0 10px}.prose strong{font-weight:600}.prose ul,.prose ol{padding-left:23px;margin:15px 0}.prose li{padding-left:3px;margin:7px 0}.prose a{color:var(--green);text-decoration:underline;text-underline-offset:3px}.prose .primary,.prose .secondary{text-decoration:none}.prose .primary{color:white}.prose .katex{font-size:1.06em}.prose .katex-display{font-size:.94em;margin:24px 0;overflow-x:auto;overflow-y:hidden;padding:8px 3px;max-width:100%}.prose .katex-display>.katex{max-width:none}.prose math{font-family:serif}.table-scroll{max-width:100%;overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:6px}.prose table{border-collapse:collapse;width:100%;font-size:12px;line-height:1.9;text-align:left;min-width:480px}.prose th{font-weight:600;background:var(--soft);color:var(--green)}.prose td,.prose th{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top;min-width:95px}.prose tr:last-child td{border-bottom:0}.prose th:not(:last-child),.prose td:not(:last-child){border-right:1px solid var(--line)}.callout{font-size:12px;line-height:1.9;background:var(--soft);border-left:3px solid #9db68b;padding:13px 18px;margin:0 0 25px;border-radius:0 6px 6px 0}.callout p{margin:0}.callout:has(strong){background:var(--warning);border-left-color:#c9ad78}.reader-layout{display:grid;grid-template-columns:215px minmax(0,1fr) 168px;gap:24px;align-items:start}.reader-sidebar,.page-toc{position:sticky;top:105px}.reader-sidebar{padding-top:10px}.chapter-link{display:flex;gap:13px;align-items:center;padding:15px 12px;margin-bottom:6px;border-radius:6px;font-size:13px}.chapter-link small{display:block;color:var(--secondary);font-size:10px;margin-top:3px}.chapter-link:hover{background:#eaf0e3}.chapter-link.current{background:var(--green-soft);color:var(--green);font-weight:600}.read-dot{margin-left:auto;width:6px;height:6px;flex-shrink:0;border-radius:50%;border:1px solid #b9c3b1}.read-dot.done{background:var(--green);border-color:var(--green)}.sidebar-note{border-top:1px solid var(--line-strong);margin-top:25px;padding:20px 11px;color:var(--secondary);font-size:11px}.sidebar-note strong{font-size:11px;font-weight:500;color:var(--ink)}.sidebar-note p{margin-top:7px;font-size:10px}.sidebar-shortcut{display:flex;align-items:center;gap:8px;font-size:11px;padding:12px;background:var(--soft);border:1px solid var(--line);border-radius:6px;color:var(--green)}.sidebar-shortcut .icon{width:16px}.page-toc{font-size:11px;max-height:calc(100vh - 125px);overflow-y:auto;padding:10px 0}.page-toc>a{display:block;padding:6px 10px;border-left:1px solid var(--line);color:var(--secondary);line-height:1.7;margin:2px 0}.page-toc>a:hover,.page-toc>a.active{color:var(--green);border-left-color:var(--green);background:var(--green-soft)}.page-toc .back-top{margin-top:20px;border:0;font-size:10px}.selftest{border:1px solid var(--line);border-radius:7px;margin:13px 0}.selftest summary{cursor:pointer;padding:15px 18px;font-size:13px;font-weight:500}.selftest[open] summary{border-bottom:1px solid var(--line);background:var(--soft)}.answer{padding:4px 19px 12px;font-size:13px;line-height:2}.selftest .answer>p:first-child{margin-top:12px}.chapter-finish{display:flex;gap:12px;flex-wrap:wrap;margin:35px 0 24px}.next-chapter{border-top:1px solid var(--line);padding-top:24px}.next-chapter a{display:grid;grid-template-columns:1fr auto;text-decoration:none!important;gap:4px 15px}.next-chapter span{font-size:11px;color:var(--secondary)}.next-chapter strong{font-size:16px;grid-column:1}.next-chapter .icon{grid-column:2;grid-row:1/3;align-self:center}.mobile-chapters{display:none}.checklist-item{display:flex;gap:11px;align-items:flex-start;padding:12px 0;border-bottom:1px solid var(--line);font-size:13px;cursor:pointer;line-height:1.8}.checklist-item input{width:18px;height:18px;accent-color:var(--green);margin:3px 0 0;flex-shrink:0;cursor:pointer}.checklist-item:has(:checked) span{color:var(--secondary)}.site-footer{display:flex;align-items:center;gap:20px;justify-content:space-between;font-size:11px;color:var(--secondary);padding:25px 0 32px}.footer-year{color:#71816a;margin-left:10px}.text-button{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:8px;border-radius:5px;background:transparent;color:var(--secondary);font-size:11px}.text-button .icon{width:16px}.text-button:hover{background:var(--green-soft)}.practice-tools{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line-strong);gap:12px}.filter-tabs{display:flex;gap:25px}.filter-tabs button{display:flex;align-items:center;gap:7px;padding:14px 0;background:transparent;border-bottom:2px solid transparent;font-size:13px;color:var(--secondary);min-height:47px;white-space:nowrap}.filter-tabs button.active{border-bottom-color:var(--green);font-weight:600;color:var(--green)}.filter-tabs b{background:var(--green-soft);font-variant-numeric:tabular-nums}.practice-filters{display:flex;gap:12px;align-items:center;padding:20px 0 9px}.local-search{display:flex;gap:9px;align-items:center;padding:0 12px;height:44px;background:white;border:1px solid var(--line);border-radius:6px;width:420px;max-width:100%}.local-search .icon{width:17px;color:var(--secondary)}.local-search input{min-width:0;width:100%;border:0;background:none;outline:none;font-size:13px;color:var(--ink)}select{height:44px;background:white;border:1px solid var(--line);border-radius:6px;padding:0 30px 0 12px;font-size:12px;color:var(--ink);cursor:pointer}.practice-filters>span{margin-left:auto;color:var(--secondary);font-size:11px}.practice-hint{font-size:11px;color:var(--secondary);margin-bottom:22px}.exercise-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}.exercise-card{padding:24px 27px;background:white;border:1px solid var(--line);border-radius:10px;min-width:0;scroll-margin-top:100px}.exercise-meta{display:flex;align-items:center;gap:12px;font-size:10px;color:var(--secondary)}.exercise-meta>span:first-child{padding:3px 7px;background:var(--soft);border-radius:4px;color:var(--green)}.exercise-index{margin-left:auto;font-variant-numeric:tabular-nums}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:5px;background:transparent;color:var(--secondary);flex-shrink:0}.icon-button:hover{background:var(--green-soft)}.favorite[aria-pressed=true]{color:var(--green)}.favorite[aria-pressed=true] .icon{fill:#d3e4c6}.exercise-card h2{font-size:16px;font-weight:500;line-height:1.95;min-height:66px;margin:12px 0 15px;text-wrap:pretty;overflow-wrap:anywhere}.exercise-card .katex{font-size:1em}.exercise-answer{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:10px}.exercise-answer summary{font-size:12px;color:var(--green);padding:13px 0;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between}.exercise-answer summary::-webkit-details-marker{display:none}.exercise-answer[open] summary .icon{transform:rotate(90deg)}.exercise-answer .answer{padding:0 0 7px}.exercise-answer .prose{font-size:13px;line-height:2}.self-rating{display:flex;align-items:center;gap:7px;margin-top:18px}.self-rating button{min-height:44px;padding:8px 10px;border:1px solid var(--line);background:white;border-radius:5px;font-size:11px;display:inline-flex;gap:6px;align-items:center}.self-rating .icon{width:14px}.self-rating button[aria-pressed=true]{background:var(--green-soft);border-color:#9cb98b;color:var(--green)}.self-rating button[data-value=review][aria-pressed=true]{background:var(--warning);border-color:#d1b98d;color:var(--warning-ink)}.self-rating>span{margin-left:auto;font-size:10px;color:var(--secondary)}.note-details{margin-top:15px;font-size:10px;color:var(--secondary)}.note-details summary{cursor:pointer;padding:7px 0}.note-details textarea{display:block;width:100%;min-height:100px;padding:12px;border:1px solid var(--line);border-radius:5px;color:var(--ink);margin-top:8px;resize:vertical;font-size:13px;line-height:1.8;background:var(--page)}.empty-state{text-align:center;padding:70px 20px;background:white;border:1px solid var(--line);border-radius:10px}.empty-state h2{font-size:20px;margin-bottom:10px}.empty-state p{color:var(--secondary);font-size:13px;margin-bottom:20px}dialog{width:min(680px,calc(100% - 32px));max-height:80vh;border:1px solid var(--line);border-radius:12px;padding:25px;box-shadow:0 20px 80px #20382b26;color:var(--ink)}dialog::backdrop{background:#1a2e244d;backdrop-filter:blur(3px)}.search-head{display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--line);padding:0 0 12px}.search-head input{border:0;outline:none;background:transparent;color:var(--ink);font-size:16px;width:100%;min-width:0}.search-results{margin-top:15px;max-height:56vh;overflow-y:auto}.search-result{display:block;padding:13px 12px;border-radius:6px}.search-result:hover{background:var(--soft)}.search-result span{font-size:10px;color:var(--green)}.search-result strong{display:block;font-size:14px;font-weight:500;margin:4px 0}.search-result p{font-size:11px;color:var(--secondary)}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:15px}.dialog-head h2{font-size:20px}.muted{color:var(--secondary);font-size:12px}.search-results>.muted{padding:15px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--green);color:white;font-size:12px;padding:12px 20px;border-radius:6px;z-index:100;box-shadow:0 4px 20px #20382b22;max-width:90vw}.flash{outline:3px solid #9bb587;outline-offset:4px}
@media(min-width:1600px){.reader-layout{grid-template-columns:225px minmax(0,1fr) 180px;gap:30px}.paper{padding:38px 45px}}
@media(max-width:1200px){.reader-layout{grid-template-columns:190px minmax(0,1fr);gap:20px}.page-toc{display:none}.header-inner{gap:25px}.workspace,.header-inner{padding-left:30px;padding-right:30px}.home-layout{grid-template-columns:minmax(0,1fr) 270px;gap:20px}.chapter-card{padding:20px 20px 0}.chapter-card p{min-height:40px}.study-summary{width:270px}.prose{font-size:14px}.paper{padding:28px}.focus-panel{padding:22px 20px}.focus-panel h2{font-size:19px}}
@media(max-width:900px){.header-inner{height:auto;min-height:75px;flex-wrap:wrap;gap:10px;padding-top:16px}.study-nav{order:3;width:100%;overflow-x:auto;gap:18px}.nav-item{padding:0 6px;height:48px;flex-shrink:0;border-radius:0}.nav-item.active{background:none;border-bottom:2px solid var(--green)}.search-open{margin-left:auto}.workspace-intro{padding-top:25px;gap:20px}.study-summary{width:240px;padding-left:20px}.summary-numbers{gap:20px}.summary-numbers strong{font-size:23px}.summary-numbers>div{gap:6px}.summary-numbers>div>span{font-size:10px}h1{font-size:26px}.home-layout{grid-template-columns:1fr}.focus-panel{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px 25px;align-items:start}.focus-panel>.eyebrow{grid-column:1/-1;margin-bottom:0}.focus-panel>h2{grid-column:1/-1;margin-bottom:12px}.focus-step{margin-bottom:5px}.focus-panel .full{margin:0}.focus-panel .panel-note{margin:0}.reader-layout{grid-template-columns:minmax(0,1fr)}.reader-sidebar{display:none}.mobile-chapters{display:block;margin:0 0 16px;background:white;border:1px solid var(--line);border-radius:6px;font-size:12px}.mobile-chapters summary{padding:12px 16px;cursor:pointer}.mobile-chapters a{display:block;padding:12px 20px;border-top:1px solid var(--line)}.prose{font-size:15px}.prose h2{font-size:21px}.exercise-card{padding:20px}.exercise-card h2{font-size:15px}.self-rating{flex-wrap:wrap}.self-rating>span{font-size:9px}.overview-tip{display:none}.site-footer{flex-wrap:wrap}.site-footer>span:nth-child(2){margin-left:auto}}
@media(max-width:600px){html{scroll-padding-top:20px}.app-header{position:relative}.header-inner,.workspace{padding-left:18px;padding-right:18px}.header-inner{padding-top:14px}.brand{font-size:16px;gap:9px}.brand-mark{width:32px;height:34px;line-height:32px;font-size:26px}.search-open>span,.search-open>kbd{display:none}.search-open{padding:0;width:44px;justify-content:center}.study-nav{gap:0;justify-content:space-between}.nav-item{font-size:11px;gap:5px;padding:0 1px;min-height:48px}.nav-item .icon{width:14px}.nav-item b{font-size:9px;padding:1px 4px}.workspace-intro{display:block;padding:23px 0 20px}.breadcrumb{font-size:10px;gap:10px}h1{font-size:26px;margin:10px 0 7px}.intro-description{font-size:11px;line-height:1.9}.study-summary{padding:0;border:0;width:100%;display:flex;align-items:center;gap:20px;margin-top:20px}.summary-numbers{gap:23px;flex-shrink:0}.summary-numbers strong{font-size:20px}.summary-numbers small{font-size:10px}.summary-numbers>div>span{font-size:9px}.progress-line{display:none}.progress-track{flex:1;height:3px;max-width:100px}.overview-bar{gap:19px;font-size:10px;padding:13px 0}.overview-bar b{font-size:15px;margin-right:3px}.section-heading h2{font-size:15px}.section-heading>span{font-size:10px}.home-layout{margin:22px 0;gap:20px}.chapter-grid{grid-template-columns:1fr;gap:13px}.chapter-card{padding:20px 22px 0}.card-top{font-size:10px}.chapter-card h2{font-size:22px;margin-top:12px}.chapter-card p{font-size:12px;min-height:0}.tags{margin:14px 0 18px}.focus-panel{display:block;padding:23px}.focus-panel h2{font-size:22px;margin:9px 0 22px}.focus-step{margin:0 0 20px}.focus-step strong{font-size:13px}.focus-step p{font-size:12px}.focus-panel .full{margin:10px 0 0}.focus-panel .panel-note{font-size:10px;margin-top:14px}.paper,.home-notes{padding:23px 20px;border-radius:8px}.home-notes{padding-top:0}.prose{font-size:15px;line-height:2}.prose h2{font-size:20px;margin:30px 0 16px;scroll-margin-top:20px}.prose h3{font-size:17px}.prose .katex{font-size:.98em}.prose .katex-display{font-size:.88em;margin:20px 0}.prose table{font-size:11px;min-width:460px}.prose td,.prose th{padding:10px 12px}.table-scroll{margin:17px 0}.callout{font-size:11px;padding:12px 14px}.selftest summary{font-size:12px;padding:13px 14px}.answer{padding:0 14px 10px;font-size:13px}.chapter-finish .primary,.chapter-finish .secondary{width:100%}.site-footer{display:flex;gap:4px 15px;font-size:10px;padding:20px 0 25px}.site-footer>span:nth-child(2){margin:0;order:3;width:100%;font-size:9px}.site-footer .text-button{margin-left:auto}.checklist-item{font-size:12px;padding:12px 0}.practice-tools{align-items:center;gap:5px}.filter-tabs{gap:15px;overflow-x:auto}.filter-tabs button{font-size:11px;gap:4px}.filter-tabs b{font-size:9px}.practice-tools>.text-button{font-size:0;min-width:35px;justify-content:center;padding:5px}.practice-tools>.text-button .icon{width:18px}.practice-filters{flex-wrap:wrap;gap:10px;padding-top:15px}.local-search{width:100%}.local-search input{font-size:16px}.practice-filters select{font-size:12px}.practice-hint{font-size:10px;margin:8px 0 17px}.exercise-grid{grid-template-columns:1fr;gap:15px}.exercise-card{padding:18px 20px;scroll-margin-top:20px}.exercise-card h2{font-size:16px;min-height:0;margin:10px 0 17px}.exercise-meta{font-size:10px}.self-rating{gap:7px;flex-wrap:nowrap}.self-rating>span{font-size:9px}.note-details textarea{font-size:16px}.self-rating button{padding:8px;font-size:11px}.exercise-answer .prose{font-size:14px}.note-details{font-size:11px}dialog{padding:18px}.search-head{gap:7px}.search-head input{font-size:16px}.search-head>.icon{display:none}.search-result{padding:12px 5px}.search-result strong{font-size:13px}.search-result p{font-size:11px}.dialog-head h2{font-size:19px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{body{background:white;color:black}.app-header,.reader-sidebar,.page-toc,.mobile-chapters,.study-summary,.site-footer,.chapter-finish,.next-chapter,.skip-link,.favorite,.self-rating,.note-details,.practice-tools,.practice-filters,.focus-panel,.progress-track{display:none!important}.workspace{padding:0;max-width:none}.workspace-intro{padding:0 0 20px}.reader-layout{display:block}.paper,.exercise-card{padding:0;border:0}.prose{font-size:11pt}.prose h2{break-after:avoid}.prose table{font-size:9pt;min-width:0}.prose .katex-display{overflow:visible;font-size:.85em}.exercise-grid{display:block}.exercise-card{break-inside:avoid;margin-bottom:20px}details:not([open])>*:not(summary){display:block}.selftest summary{background:white}.table-scroll{overflow:visible}.chapter-card{break-inside:avoid}.overview-bar{margin-bottom:15px}}