:root{--worksheet-blue:var(--learn-blue,#086bea);--worksheet-ink:var(--learn-ink,#0a1744);--worksheet-muted:var(--learn-muted,#536b87);--worksheet-line:var(--learn-line,#d6e6f4);--worksheet-sky:var(--learn-sky,#eff8ff)}
html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:var(--worksheet-ink);background:#f5faff;line-height:1.7}*{box-sizing:border-box}button,input,textarea,select{font:inherit}a{color:var(--worksheet-blue)}[hidden]{display:none!important}button:disabled{cursor:not-allowed;opacity:.5}button,a,input,select,textarea,summary{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #086bea}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.35;text-wrap:pretty}h2{font-size:clamp(23px,2.2vw,30px);margin-bottom:0}h3{font-size:20px}textarea{resize:vertical;min-height:85px}input,textarea,select{min-width:0;width:100%;color:var(--worksheet-ink);background:#fff;border:1px solid #adc9df;border-radius:10px;padding:12px 14px;line-height:1.65}textarea::placeholder,input::placeholder{color:#6c7c8c;opacity:1}input[type=radio]{width:20px;min-width:20px;height:20px;accent-color:var(--worksheet-blue)}input[type=date]{min-height:50px}label.learn-field{display:flex;flex-direction:column;gap:8px;margin:18px 0;font-size:16px;font-weight:600}label.learn-field textarea,label.learn-field input,label.learn-field select{font-weight:400}fieldset{min-width:0}.learn-shell{max-width:1200px;margin:0 auto;padding:0 24px}.learn-header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:25px 0}.learn-brand{font-size:19px;font-weight:800;text-decoration:none;color:var(--worksheet-ink)}.learn-nav{display:flex;gap:20px;flex-wrap:wrap}.learn-nav a{text-decoration:none;font-size:15px;font-weight:600}.learn-main{padding:0 0 35px}.learn-eyebrow{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--worksheet-blue);margin:0 0 7px}.learn-card{background:#fff;border:1px solid var(--worksheet-line);border-radius:20px}.learn-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:11px 18px;border:1px solid var(--worksheet-blue);border-radius:11px;background:var(--worksheet-blue);color:#fff;font-weight:650;text-decoration:none;cursor:pointer;line-height:1.5}.learn-button.secondary{background:#fff;color:var(--worksheet-blue);border-color:#bad7ee}.learn-button.quiet{background:transparent;color:var(--worksheet-muted);border-color:transparent}.learn-button:hover:not(:disabled){filter:brightness(.96)}.learn-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.learn-status{font-size:14px;color:var(--worksheet-muted);margin:0}.learn-tag{display:inline-block;color:var(--worksheet-blue);font-size:13px;font-weight:700;background:#e4f2ff;border-radius:6px;padding:3px 9px}.learn-footer{font-size:14px;color:var(--worksheet-muted);padding:30px 0 45px;border-top:1px solid var(--worksheet-line)}.learn-footer div{display:flex;gap:20px;flex-wrap:wrap}.worksheet-skip{position:fixed;top:-100px;left:20px;z-index:30;background:#fff;padding:12px 20px}.worksheet-skip:focus{top:10px}.worksheet-hero{padding:36px 42px 32px;background:linear-gradient(115deg,#e3f4ff 0,#f9fcff 65%,#e7f5ff 100%);border:1px solid #d1e9fb;border-radius:24px;margin:8px 0 20px}.worksheet-hero h1{font-size:clamp(32px,4.1vw,48px);letter-spacing:-.02em;margin:12px 0 18px}.worksheet-lead{font-size:18px;max-width:780px;line-height:1.8;margin-bottom:20px}.worksheet-principles{display:flex;flex-wrap:wrap;gap:10px 20px;font-weight:700;font-size:14px;color:#065fc7}.worksheet-principles span::before{content:"";display:inline-block;width:6px;height:6px;background:#169cdf;border-radius:50%;vertical-align:middle;margin:0 8px 2px 0}.worksheet-privacy{font-size:13px;color:var(--worksheet-muted);max-width:880px;margin:18px 0 0}.worksheet-toolbar{display:flex;justify-content:space-between;gap:15px;align-items:center;background:#fff;border:1px solid var(--worksheet-line);border-radius:15px;padding:14px 18px;margin-bottom:24px}.worksheet-toolbar .learn-button{font-size:13px;padding:8px 12px;min-height:40px}.worksheet-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px;align-items:start}.worksheet-outline{position:sticky;top:22px;padding:8px 0 18px}.worksheet-progress-head{display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:15px}.worksheet-progress-head span{color:var(--worksheet-blue);font-variant-numeric:tabular-nums}progress{width:100%;height:7px;border:0;border-radius:10px;margin:12px 0 14px;background:#dbeaf5;color:var(--worksheet-blue)}progress::-webkit-progress-bar{background:#dbeaf5;border-radius:10px}progress::-webkit-progress-value{background:var(--worksheet-blue);border-radius:10px}progress::-moz-progress-bar{background:var(--worksheet-blue);border-radius:10px}.worksheet-outline ol{padding:0;margin:0;list-style:none}.worksheet-outline li{padding:11px 10px;margin:2px -10px;border-radius:12px}.worksheet-outline li a{display:flex;gap:9px;text-decoration:none;font-weight:650;font-size:14px;color:var(--worksheet-ink)}.worksheet-outline li a span{color:#47708e;font-size:12px;line-height:24px}.worksheet-outline li small{display:block;margin-left:25px;color:var(--worksheet-muted);font-size:12px}.worksheet-outline li.complete{background:#e6f3ff}.worksheet-outline li.complete small{color:#075bad}.worksheet-review-link{display:block;margin-top:22px;font-size:14px;text-decoration:none;font-weight:700}.worksheet-fine{font-size:13px;color:var(--worksheet-muted);line-height:1.7;margin:12px 0}.worksheet-outline .worksheet-fine{margin-top:16px}.worksheet-sections{display:grid;gap:24px;min-width:0}.worksheet-section{padding:28px 30px;scroll-margin-top:20px}.worksheet-section>p{color:var(--worksheet-muted);font-size:15px}.worksheet-section-heading{display:flex;gap:15px;align-items:center;margin-bottom:20px}.worksheet-number{display:grid;place-items:center;flex:0 0 46px;height:46px;border-radius:13px;color:#fff;background:linear-gradient(145deg,#13a8e0,#086bea);font-size:18px;font-weight:800}.worksheet-standard{display:flex;gap:13px;padding:15px 17px;background:var(--worksheet-sky);border-radius:12px;margin:24px 0 0;font-size:14px;color:#345774}.worksheet-standard strong{white-space:nowrap;color:#085ab8}.worksheet-reference{border:1px solid var(--worksheet-line);border-radius:12px;margin:18px 0;background:#f8fcff;overflow:hidden}.worksheet-reference summary{cursor:pointer;padding:15px 17px;font-size:14px;font-weight:650;color:#155caa}.worksheet-reference summary[aria-disabled=true]{cursor:not-allowed;color:#65798f}.worksheet-reference summary .worksheet-lock{float:right;font-size:12px;font-weight:400;margin-left:10px}.worksheet-reference>div{padding:0 18px 18px;font-size:15px;color:#294b69}.worksheet-reference>div p:last-child{margin-bottom:0}.worksheet-track-picker{padding:0;margin:20px 0;border:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.worksheet-track-picker legend{font-size:15px;font-weight:700;margin-bottom:11px}.worksheet-track-picker label{display:flex;align-items:flex-start;gap:8px;background:#f7fbff;border:1px solid var(--worksheet-line);border-radius:13px;padding:15px 11px;cursor:pointer}.worksheet-track-picker label:has(input:checked){border-color:var(--worksheet-blue);background:#eaf5ff;box-shadow:0 0 0 1px var(--worksheet-blue)}.worksheet-track-picker strong{font-size:15px}.worksheet-track-picker small{display:block;font-size:12px;color:var(--worksheet-muted);line-height:1.6;margin-top:4px}.worksheet-track-brief{background:var(--worksheet-sky);padding:20px 22px;border-radius:14px;margin:15px 0}.worksheet-track-brief h3{margin-bottom:9px}.worksheet-track-brief p,.worksheet-track-brief li{font-size:14px;color:#315574}.worksheet-track-brief ul{margin:10px 0 0;padding-left:20px}.worksheet-simulation{margin-top:26px;padding-top:24px;border-top:1px solid var(--worksheet-line);display:flex;align-items:center;justify-content:space-between;gap:20px}.worksheet-simulation h3{font-size:18px;margin:8px 0}.worksheet-simulation .learn-button{flex-shrink:0;font-size:14px}.worksheet-evidence-summary{font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere;margin:13px 0}.worksheet-evidence-summary:empty{display:none}.worksheet-check-grid,.worksheet-two-col{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}.worksheet-check-grid label.learn-field{font-size:14px;margin:10px 0}.worksheet-case{padding:18px 20px;background:var(--worksheet-sky);border-radius:13px}.worksheet-action-card{padding:5px 20px 12px;border:1px solid #c6e3f9;background:#f6fbff;border-radius:17px}.worksheet-completion{font-size:15px;padding:16px 0 0;color:#075bad!important;font-weight:650}.worksheet-date{max-width:260px}.worksheet-retrieval{padding-top:24px;margin-top:28px;border-top:1px solid var(--worksheet-line)}.worksheet-retrieval-heading{display:flex;justify-content:space-between;align-items:baseline;gap:14px}.worksheet-retrieval-heading h3{margin-bottom:10px}.worksheet-retrieval-heading span{font-size:13px;color:#37698f;white-space:nowrap}.worksheet-retrieval>p{font-size:15px;color:var(--worksheet-muted)}.worksheet-retrieval .learn-status{color:#075bad}.worksheet-dialog{border:1px solid #bddcf2;border-radius:20px;max-width:500px;width:calc(100% - 36px);padding:28px;color:var(--worksheet-ink);box-shadow:0 24px 80px #08285233}.worksheet-dialog::backdrop{background:#0a17446b}.worksheet-dialog h2{font-size:24px;margin-bottom:15px}.worksheet-dialog p{font-size:16px;white-space:pre-wrap}.worksheet-dialog .learn-actions{justify-content:flex-end}.worksheet-print{display:none}.worksheet-noscript{padding:20px;background:#fff0d9;color:#573b11;font-weight:700;position:fixed;bottom:0;width:100%;margin:0}
@media(max-width:1020px){.worksheet-layout{grid-template-columns:180px minmax(0,1fr);gap:20px}.worksheet-section{padding:24px}.worksheet-track-picker{grid-template-columns:1fr}.worksheet-track-picker label{align-items:center;padding:11px 14px}.worksheet-track-picker label span{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.worksheet-track-picker small{margin-top:0}.worksheet-simulation{align-items:flex-start;flex-direction:column}.worksheet-toolbar{align-items:flex-start;flex-direction:column}.worksheet-two-col{grid-template-columns:1fr}}
@media(max-width:760px){html{scroll-padding-top:20px}.learn-shell{padding:0 16px}.learn-header{align-items:flex-start;flex-direction:column;gap:12px;padding:20px 0}.learn-nav{gap:12px 20px}.learn-nav a{font-size:14px}.worksheet-hero{padding:27px 24px}.worksheet-hero h1{font-size:34px}.worksheet-lead{font-size:16px}.worksheet-principles{gap:7px 14px;font-size:13px}.worksheet-layout{display:block}.worksheet-outline{position:static;padding:6px 0 22px}.worksheet-outline ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 10px}.worksheet-outline li{padding:10px;margin:0;background:#fff;border:1px solid var(--worksheet-line)}.worksheet-outline .worksheet-fine{margin-bottom:0}.worksheet-review-link{margin-top:15px}.worksheet-section{padding:24px 20px}.worksheet-section-heading{gap:12px}.worksheet-number{flex-basis:40px;height:40px;border-radius:12px;font-size:16px}.worksheet-section-heading .learn-eyebrow{font-size:11px;letter-spacing:.02em}.worksheet-section h2{font-size:23px}.worksheet-check-grid{grid-template-columns:1fr}.worksheet-reference summary .worksheet-lock{float:none;display:block;margin:4px 0 0;font-size:12px}.worksheet-standard{flex-direction:column;gap:4px}.worksheet-retrieval-heading{align-items:flex-start;flex-direction:column;gap:0;margin-bottom:10px}.worksheet-action-card{padding:4px 14px}.worksheet-toolbar .learn-actions{width:100%}.worksheet-toolbar .learn-button{flex:1 1 auto}.worksheet-simulation .learn-button{width:100%}.learn-footer div{gap:10px 17px}.worksheet-dialog{padding:24px}.worksheet-section textarea{font-size:16px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
@media print{@page{size:A4;margin:18mm}.worksheet-screen,.worksheet-dialog,.worksheet-noscript{display:none!important}.worksheet-print{display:block;white-space:pre-wrap;overflow-wrap:anywhere;font:11pt/1.65 "PingFang SC","Microsoft YaHei",sans-serif;color:#101b31}body{background:#fff}.worksheet-print h1{font-size:20pt;margin-bottom:12pt}.worksheet-print pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit}a{color:inherit} }