@charset "UTF-8";
:root{--paper:#f7f7f2;--surface:#fff;--ink:#202d27;--muted:#6b756e;--green:#244b3e;--green-light:#e9f0e9;--line:#e1e5dc;--ochre:#9c6b23;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;--serif:"Noto Serif SC","Songti SC",SimSun,serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #82a896;outline-offset:4px}button{color:inherit}button:disabled{opacity:.4;cursor:default}::selection{background:#d8e6d8}.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}.skip-link{position:fixed;top:-60px;left:15px;background:var(--green);color:white;padding:10px;z-index:20}.skip-link:focus{top:8px}
.topbar{height:82px;display:flex;align-items:center;justify-content:space-between;padding:0 38px;border-bottom:1px solid var(--line);background:rgba(247,247,242,.97);position:sticky;top:0;z-index:5}.brand{display:flex;gap:12px;align-items:center;font-weight:650;font-size:16px;letter-spacing:1px}.brand small{display:block;font:9px/1.6 var(--mono);letter-spacing:2px;color:var(--muted);margin-top:3px}.brand-mark{width:38px;height:40px;border:1px solid var(--green);display:flex;align-items:center;justify-content:center;font:26px Georgia,serif;color:var(--green);position:relative}.brand-mark span{font:14px var(--mono);margin:-15px 0 0 3px}.topnav{display:flex;align-items:center;gap:32px;height:100%;font-size:14px}.topnav a{height:100%;display:flex;align-items:center;border-bottom:2px solid transparent;color:var(--muted)}.topnav a.active{color:var(--green);border-color:var(--green)}.menu-toggle{display:none;background:none;border:1px solid var(--line);padding:6px 10px;border-radius:5px}.layout{max-width:1560px;margin:auto;display:grid;grid-template-columns:270px minmax(0,1fr)}.sidebar{padding:31px 22px 25px 30px;border-right:1px solid var(--line);position:sticky;top:82px;height:calc(100dvh - 82px);overflow-y:auto}.search-form{position:relative;margin-bottom:32px}.search-form input{width:100%;height:40px;background:#eeefe8;border:1px solid transparent;border-radius:6px;padding:8px 32px 8px 12px;font-size:12px;min-width:0}.search-form input:focus{background:#fff;border-color:#8caa98}.search-form button{position:absolute;right:4px;top:4px;width:30px;height:32px;border:0;background:none;color:var(--muted)}.sidebar-label{font-size:10px;letter-spacing:2px;color:var(--muted);display:flex;justify-content:space-between;margin:0 9px 12px}.sidebar-label span{font:10px var(--mono);letter-spacing:0}.chapter-link{display:flex;gap:11px;align-items:center;padding:10px 11px;margin-bottom:3px;border-radius:5px;font-size:12px;line-height:1.8;color:#536159}.chapter-link .num{font:10px var(--mono);color:#8b948b;min-width:17px}.chapter-link.active{background:var(--green-light);color:var(--green);font-weight:650}.chapter-link:hover,.scenario-link:hover{background:#ecefe7}.chapter-link.active .num{color:var(--green)}.scenario-link{border-top:1px solid var(--line);display:flex;gap:11px;margin-top:18px;padding:18px 10px;font-size:12px}.count{margin-left:auto;color:var(--muted);font:11px var(--mono)}.learning-progress{margin:25px 10px 0}.learning-progress>div{display:flex;justify-content:space-between;font-size:11px}.learning-progress strong{font:11px var(--mono)}progress{width:100%;height:5px;appearance:none;border:0;border-radius:6px;margin:11px 0 3px;background:#e1e5dc}progress::-webkit-progress-bar{background:#e1e5dc;border-radius:6px}progress::-webkit-progress-value{background:var(--green);border-radius:6px}progress::-moz-progress-bar{background:var(--green)}.learning-progress p{font-size:10px;color:var(--muted);margin:3px 0}.sidebar-foot{font-size:10px;color:var(--muted);margin:40px 10px 0;line-height:2}.sidebar-foot span{font:9px var(--mono);letter-spacing:1px}main{padding:47px 58px 60px;min-width:0;outline:none}.loading{padding:60px;color:var(--muted)}.eyebrow{font:10px/1.5 var(--mono);letter-spacing:2px;color:var(--green);display:flex;align-items:center;gap:10px}.eyebrow:before{content:"";height:6px;width:6px;background:var(--green);display:inline-block;border-radius:50%}.hero{padding:12px 0 33px;border-bottom:1px solid var(--line);position:relative}.hero h1{font:500 clamp(30px,3.2vw,47px)/1.55 var(--serif);letter-spacing:2px;margin:22px 0 15px}.hero p{color:var(--muted);font-size:13px;max-width:560px;line-height:1.9;margin-bottom:25px}.button{display:inline-flex;align-items:center;gap:22px;padding:10px 18px;border:1px solid var(--green);border-radius:5px;background:var(--green);color:#fff;font-size:12px;line-height:1.6;transition:background .15s}.button:hover{background:#38634f}.button.secondary{color:var(--green);background:transparent;border-color:var(--line)}.button.secondary:hover{background:var(--green-light)}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.hero-stamp{position:absolute;right:0;top:46px;width:122px;height:122px;border:1px solid #c6d2c4;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#5e7d68;transform:rotate(-10deg);font:11px/1.8 var(--mono);background:repeating-linear-gradient(0deg,transparent,transparent 8px,#e8ece3 9px,transparent 10px);box-shadow:inset 0 0 0 7px var(--paper),inset 0 0 0 8px #dbe1d4}.hero-stamp strong{font:30px/1.1 Georgia,serif;font-weight:normal}.stats{display:flex;gap:48px;padding:26px 0 28px}.stat strong{font:28px/1.3 var(--mono);font-weight:400;color:var(--green)}.stat span{margin-left:11px;font-size:11px;color:var(--muted)}.section-heading{display:flex;align-items:baseline;justify-content:space-between;margin:22px 0 16px}.section-heading h2{font-size:17px;font-weight:600;margin:0}.section-heading>span{font-size:11px;color:var(--muted)}.module-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.module-card{border:1px solid var(--line);padding:21px 21px 17px;background:#fcfcf8;border-radius:7px;display:flex;flex-direction:column;transition:transform .15s,border-color .15s}.module-card:hover{transform:translateY(-2px);border-color:#91aa98;background:#fff}.card-top{display:flex;justify-content:space-between;align-items:center}.module-index{font:12px var(--mono);color:#819083}.module-tag{font-size:9px;color:#718071;letter-spacing:.5px}.module-card h3{font-size:15px;margin:17px 0 7px;font-weight:600}.module-card p{font-size:11px;color:var(--muted);line-height:1.8;margin:0 0 20px;flex:1}.card-bottom{display:flex;justify-content:space-between;font:10px var(--mono);color:#6a7b6e;border-top:1px solid #e9ece4;padding-top:12px}.practice-banner{margin-top:27px;background:var(--green);color:#f4f6ec;padding:26px 28px;border-radius:7px;display:flex;align-items:center;justify-content:space-between;gap:20px}.practice-banner small{font:10px var(--mono);color:#bccfbe;letter-spacing:2px}.practice-banner h2{font:21px/1.6 var(--serif);margin:7px 0}.practice-banner p{font-size:11px;color:#c3d1c5;margin:0}.practice-banner a{border:1px solid #6a8976;padding:10px 15px;font-size:12px;border-radius:4px;white-space:nowrap}.page-foot{font-size:10px;color:var(--muted);padding:25px 0 0;margin-top:26px;border-top:1px solid var(--line);line-height:1.9}.page-head h1{font:500 32px/1.5 var(--serif);margin:17px 0 10px;overflow-wrap:anywhere}.page-head p{font-size:13px;color:var(--muted);margin:0 0 24px;line-height:1.8}.filters{display:flex;gap:7px;flex-wrap:wrap;padding:17px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:5px}.filter{padding:5px 12px;background:transparent;border:1px solid transparent;border-radius:20px;color:var(--muted);font-size:11px}.filter.active{background:var(--green-light);border-color:#c8d6c7;color:var(--green)}.filter:hover{background:#ecefe7}.question-row{display:flex;align-items:center;gap:15px;padding:21px 8px;border-bottom:1px solid var(--line);transition:background .15s}.question-row:hover{background:#eff3eb}.question-id{font:11px var(--mono);min-width:29px;color:#78887b}.question-row h2{font-size:14px;font-weight:500;margin:0 0 5px;line-height:1.7}.question-row small{color:var(--muted);font-size:10px}.row-main{flex:1;min-width:0}.badge{font:10px var(--mono);display:inline-block;padding:2px 7px;border-radius:4px;background:#e7eee4;color:var(--green);white-space:nowrap}.badge.p1{background:#f3ecdd;color:#92661e}.status-check{font-size:12px;color:var(--green)}.row-arrow{color:#9ba89a;font-size:19px}.empty{padding:50px 15px;text-align:center;color:var(--muted);font-size:14px}.breadcrumb{display:flex;align-items:center;gap:10px;font-size:11px;color:var(--muted);margin-bottom:25px;flex-wrap:wrap}.breadcrumb a:hover{color:var(--green);text-decoration:underline}.reader{max-width:820px;margin:auto}.reader h1{font:500 clamp(24px,2.4vw,34px)/1.55 var(--serif);margin:13px 0 19px;overflow-wrap:anywhere}.reader-label{display:flex;gap:10px;align-items:center;color:var(--muted);font:11px var(--mono)}.reader-tools{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:13px 0;gap:12px;margin-bottom:26px;flex-wrap:wrap}.reader-tools label{font-size:12px;display:flex;gap:7px;align-items:center;cursor:pointer}.reader-tools input{accent-color:var(--green)}.tool-buttons{display:flex;gap:8px}.small-button{background:transparent;border:1px solid var(--line);border-radius:5px;padding:5px 10px;font-size:11px}.small-button:hover{background:var(--green-light)}.small-button.done{background:var(--green);color:#fff;border-color:var(--green)}.practice-tip{font-size:12px;line-height:1.9;padding:15px 18px;background:#edf1e7;border-left:3px solid #819a72;margin-bottom:20px;color:#55674f}.answer{border:1px solid var(--line);border-radius:7px;background:#fff;overflow:hidden}.answer>summary{padding:15px 22px;font-size:12px;color:var(--green);cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between}.answer>summary:after{content:"＋";font-size:17px}.answer[open]>summary:after{content:"−"}.answer[open]>summary{border-bottom:1px solid var(--line);background:#fbfcf8}.prose{font-size:14px;line-height:2.05;overflow-wrap:anywhere;padding:13px 28px 22px}.prose p{margin:16px 0}.prose strong{font-weight:650;color:#284e3c}.prose a{color:#477661;text-decoration:underline;text-decoration-color:#b9ccbd;text-underline-offset:3px}.prose a:hover{color:#122f20}.prose ul,.prose ol{padding-left:23px}.prose li{padding-left:3px;margin:6px 0}.prose :not(pre)>code{background:#eff2eb;border:1px solid #e4e9de;border-radius:4px;font:12px/1.7 var(--mono);padding:2px 5px;overflow-wrap:anywhere}.prose pre{position:relative;background:#1f3029;color:#e0e9de;border-radius:7px;padding:36px 20px 20px;overflow:auto;line-height:1.8;margin:23px 0;max-width:100%;tab-size:4}.prose pre code{font:12px/1.9 var(--mono);overflow-wrap:normal}.copy-code{position:absolute;right:10px;top:6px;font:10px var(--mono);background:#34483d;border:1px solid #566b5c;color:#dae6da;padding:3px 8px;border-radius:4px}.table-scroll{overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:6px}.prose table{border-collapse:collapse;min-width:440px;width:100%;font-size:12px;line-height:1.8}.prose th{background:#f0f3ea;color:#4b634f;text-align:left;font-weight:600}.prose td,.prose th{padding:10px 13px;border-bottom:1px solid var(--line);vertical-align:top}.prose tr:last-child td{border-bottom:0}.flow{margin:23px 0;background:#f4f6ef;border:1px solid #dde5d6;padding:18px;border-radius:6px}.flow ol{display:flex;flex-wrap:wrap;gap:9px;list-style:none;padding:0;margin:0}.flow li{font-size:11px;margin:0;padding:8px 12px;background:white;border:1px solid #d7e0cf;border-radius:4px}.flow li:not(:last-child):after{content:" →";color:#7d997a}.flow figcaption{font-size:11px;color:#718067;margin-top:13px;line-height:1.8}.prompt{padding:0 0 8px;font-size:15px}.prompt strong{color:var(--green)}.reader-bottom{display:flex;justify-content:space-between;gap:15px;margin:28px 0}.reader-bottom a{border:1px solid var(--line);border-radius:5px;padding:10px 15px;font-size:11px;max-width:48%;background:#fff}.reader-bottom a:hover{border-color:#87a38e}.reader-bottom a:last-child{margin-left:auto;text-align:right}.intro-box{background:#fff;border:1px solid var(--line);border-radius:6px;margin:20px 0}.intro-box summary{cursor:pointer;padding:15px 20px;color:var(--green);font-size:12px}.intro-box .prose{font-size:13px;padding-top:0}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--green);color:white;padding:10px 20px;border-radius:6px;font-size:12px;z-index:20;opacity:0;pointer-events:none;transition:opacity .15s;max-width:90vw}.toast.show{opacity:1}.noscript{position:fixed;bottom:0;background:white;padding:20px;width:100%;text-align:center}.result-summary{font-size:12px;color:var(--muted);margin:12px 0}.search-excerpt{font-size:11px;color:var(--muted);line-height:1.8;margin-top:5px}.shortcut-note{color:var(--muted);font-size:11px;margin:18px 0}
@media(min-width:1400px){main{padding-left:75px;padding-right:75px}.hero h1{font-size:48px}}
@media(max-width:1180px){main{padding:35px 32px}.layout{grid-template-columns:235px minmax(0,1fr)}.sidebar{padding-left:19px;padding-right:16px}.hero-stamp{display:none}.module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.topbar{height:68px;padding:0 18px}.brand{font-size:14px;gap:9px}.brand small{font-size:8px}.brand-mark{width:31px;height:34px;font-size:22px}.topnav{gap:17px;margin-left:auto;margin-right:18px;font-size:11px}.topnav a:first-child{display:none}.menu-toggle{display:block;font-size:11px}.layout{display:block}.sidebar{display:none;position:fixed;top:68px;left:0;width:280px;height:calc(100dvh - 68px);z-index:6;background:var(--paper);box-shadow:20px 0 60px #263b2420}.sidebar.is-open{display:block}.sidebar-foot{margin-top:25px}main{padding:26px 21px 45px}.hero{padding-top:9px}.hero h1{font-size:31px;letter-spacing:1px;margin:22px 0 14px}.hero p{font-size:12px}.stats{gap:24px;padding:22px 0}.stat strong{font-size:24px}.stat span{display:block;margin:5px 0 0;font-size:10px}.section-heading h2{font-size:16px}.section-heading>span{font-size:10px}.module-grid{gap:10px}.module-card{padding:16px 14px}.module-card h3{font-size:13px;margin-top:13px}.module-card p{font-size:11px}.module-tag{font-size:8px}.card-bottom{font-size:9px}.practice-banner{padding:22px;display:block}.practice-banner h2{font-size:20px}.practice-banner a{display:inline-block;margin-top:18px}.page-head h1{font-size:28px}.question-row{gap:10px;padding:18px 2px}.question-row h2{font-size:13px}.prose{padding:8px 18px 17px;font-size:14px}.prose pre{padding-left:13px;padding-right:13px}.reader h1{font-size:27px}.reader-tools{gap:10px}.breadcrumb{font-size:10px;gap:7px}.reader-bottom a{padding:10px;font-size:10px}.answer>summary{padding:13px 17px}.row-arrow{display:none}}
@media(max-width:360px){.topnav{display:none}.module-grid{grid-template-columns:1fr}.stats{gap:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.topbar,.sidebar,.reader-tools,.reader-bottom,.copy-code,.toast,.practice-tip{display:none!important}.layout{display:block}main{padding:0}.answer{border:0}.prose{padding:0}body{background:white}.reader{max-width:none}.answer>summary{display:none}}