:root{--paper:#f5f5f5;--surface:#fff;--paper-2:#ececec;--ink:#2d3142;--muted:#4f5d75;--soft:#5a6580;--rule:rgba(45,49,66,.14);--accent:#bf4520;--tint:rgba(191,69,32,.08);--good:#276149;--bad:#a73725;--radius:6px;font-family:'Geist','Microsoft YaHei','PingFang SC',system-ui,sans-serif;color:var(--ink);background:var(--paper);font-size:15px;line-height:1.65}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:4px}h1,h2,h3,h4,p{margin-top:0}h1{font-size:34px;line-height:1.35;letter-spacing:-1px;font-weight:600;margin-bottom:12px}h2{font-size:19px;font-weight:600;line-height:1.5}h3{font-size:17px}p{margin-bottom:16px}small,.small{font-size:12px}em{font-style:normal;color:var(--accent)}.muted{color:var(--muted)}.eyebrow{color:var(--accent);font-size:12px;letter-spacing:.12em;margin-bottom:14px}.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{position:fixed;left:16px;top:-80px;z-index:20;background:var(--ink);color:#fff;padding:12px}.skip:focus{top:12px}.sidebar{position:fixed;inset:0 auto 0 0;width:232px;padding:34px 24px 20px;border-right:1px solid var(--rule);display:flex;flex-direction:column;background:var(--paper);z-index:10}.brand{display:flex;gap:12px;align-items:center;font-size:20px;font-weight:600;letter-spacing:1px}.brand small{display:block;font-size:10px;color:var(--muted);font-weight:400;letter-spacing:0;margin-top:3px}.brand-mark{background:var(--ink);color:#fff;width:38px;height:42px;display:grid;place-items:center;font-family:serif;font-size:25px;border-radius:2px}.nav-label{font-size:10px;color:var(--muted);margin:40px 12px 12px;letter-spacing:.12em}.sidebar nav a{display:flex;align-items:center;gap:14px;min-height:48px;padding:10px 14px;border-radius:var(--radius);margin-bottom:6px;color:var(--muted);font-size:14px}.sidebar nav a>span{font-size:21px;line-height:1}.sidebar nav a.active{background:var(--tint);color:var(--accent);font-weight:600}.sidebar nav a:hover{background:var(--paper-2)}.sidebar-foot{margin-top:auto;padding:32px 12px 0}.anniversary{font-family:'Instrument Serif',Georgia,serif;font-size:52px;line-height:1;border-top:1px solid var(--rule);padding-top:22px}.anniversary span{font-family:system-ui,sans-serif;font-size:8px;letter-spacing:.1em;display:block;margin-top:8px}.sidebar-foot p{font-size:11px;color:var(--muted);margin:16px 0 24px}.sidebar-foot>a,.sidebar-foot button{font-size:12px;color:var(--muted)}.sidebar-foot form{display:inline-block;margin-left:12px}.workspace{margin-left:232px;min-height:100dvh}.workspace.guest{margin:0}.topbar{height:86px;padding:0 44px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--rule);gap:20px}.top-caption{font-size:12px;color:var(--muted)}.identity{display:flex;align-items:center;gap:10px;font-size:12px}.identity small{display:block;font-size:10px;color:var(--muted)}.avatar{height:34px;width:34px;border:1px solid var(--rule);display:grid;place-items:center;border-radius:50%;background:#fff}.main{max-width:1328px;padding:42px 44px 24px;margin:0 auto;min-height:calc(100dvh - 160px)}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:32px}.page-heading p{font-size:13px;margin:0}.edition{text-align:right;color:var(--muted);font-size:11px;border-left:1px solid var(--rule);padding:6px 0 6px 24px;white-space:nowrap}.edition span{display:block;font-size:16px;color:var(--ink);margin-top:4px}.stat-strip{display:grid;grid-template-columns:1fr 1fr 1fr 1.2fr;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:24px 0;margin-bottom:38px}.stat-strip>div{padding:0 28px;border-right:1px solid var(--rule)}.stat-strip>div:first-child{padding-left:0}.stat-strip>div:last-child{border:0;padding-right:0}.stat-strip>div>span{color:var(--muted);font-size:12px;display:block;margin-bottom:6px}.stat-strip strong{font-family:'Geist',Arial,sans-serif;display:block;font-size:32px;line-height:1.2;font-weight:500;letter-spacing:-1px}.stat-strip small{font-family:system-ui,sans-serif;letter-spacing:0;font-size:11px;margin-left:8px;color:var(--muted)}.stat-strip .stat-note{font-size:13px;align-self:center;line-height:1.9}.stat-note span{font-size:11px;color:var(--muted)}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}.section-heading h2{margin:0}.section-heading>span,.section-heading>a{font-size:12px;color:var(--muted)}.board-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-bottom:32px}.board{display:block;border:1px solid var(--rule);border-radius:var(--radius);padding:22px 20px 18px;background:transparent;position:relative;cursor:pointer;transition:background .15s,border-color .15s;min-width:0}.board>input{position:absolute;opacity:0;width:1px;height:1px}.board:focus-within{outline:3px solid var(--accent);outline-offset:3px}.board:has(input:checked){border-color:var(--accent);background:var(--tint)}.board-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:26px}.board-index{font-family:Georgia,serif;font-size:28px;color:var(--muted);font-style:italic}.check-indicator{width:19px;height:19px;border:1px solid #858a98;border-radius:3px;font-size:13px;text-align:center;line-height:17px;color:transparent}.board:has(input:checked) .check-indicator{background:var(--accent);border-color:var(--accent);color:#fff}.board h3{font-size:20px;line-height:1.2;margin-bottom:12px;font-weight:600}.board p{font-size:11px;color:var(--muted);min-height:36px;margin-bottom:20px}.board-count{font-family:Arial,sans-serif;font-size:19px}.board-count>span{font-family:system-ui,sans-serif;font-size:11px;color:var(--muted)}.practice-settings{background:var(--surface);border:1px solid var(--rule);border-radius:var(--radius);padding:26px 28px}.mode-options{border:0;margin:0 0 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var(--rule)}.messages{margin-bottom:24px}.message{padding:12px 16px;border:1px solid var(--rule);background:#fff;border-left:3px solid var(--accent);margin-bottom:10px;font-size:13px;border-radius:3px}.message.error{color:var(--bad)}.mobile-brand,.bottom-nav{display:none}.session-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.session-heading h1{font-size:28px;margin-bottom:0;margin-top:12px}.back-link{font-size:12px;color:var(--muted)}.timer{font-size:12px;color:var(--muted);text-align:right}.timer strong{display:block;font-family:Arial,sans-serif;color:var(--accent);font-size:26px;font-variant-numeric:tabular-nums}.progress-heading{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:10px}.progress-track{height:3px;background:var(--paper-2);margin-bottom:32px}.progress-track>div{height:100%;background:var(--accent)}.answer-layout{display:grid;grid-template-columns:minmax(0,1fr) 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var(--ink);outline-offset:2px}.card-legend{font-size:10px;color:var(--muted);margin-top:18px}.finish-form{margin-top:20px}.answer-sidebar>p{font-size:11px;margin-top:12px}.short-reference{margin:16px 0}.short-reference summary{cursor:pointer;color:var(--accent);font-size:13px;padding:8px 0}.short-reference>div{padding:16px;background:var(--paper);font-size:14px}.button-row{display:flex;gap:12px;flex-wrap:wrap}.result-overview{display:flex;align-items:center;gap:60px;padding:24px 0 32px;border-bottom:1px solid var(--rule);margin-bottom:36px}.result-score{font-size:64px;color:var(--accent);letter-spacing:-3px;font-family:Arial,sans-serif;line-height:1.3}.result-score>span{font-size:14px;letter-spacing:0;margin-left:8px}.result-score small{display:block;color:var(--muted);font-size:11px;letter-spacing:0}.result-counts{display:flex;gap:40px}.result-counts strong{font-size:28px;display:block;font-weight:500}.result-counts span{font-size:12px;color:var(--muted)}.review-item{border-bottom:1px solid var(--rule)}.review-item>summary{display:flex;align-items:center;gap:16px;list-style:none;cursor:pointer;padding:20px 0;font-size:14px}.review-number{font-family:Georgia,serif;font-size:21px;color:var(--muted)}.review-item summary>span:nth-child(2){flex:1;overflow-wrap:anywhere}.review-status{font-size:11px;white-space:nowrap}.correct-text{color:var(--good)}.wrong-text{color:var(--bad)}.review-body{padding:0 24px 24px 42px;font-size:14px;overflow-wrap:anywhere}.review-body h4{font-size:12px;margin-top:24px}.table-wrap{overflow:auto;border:1px solid var(--rule);border-radius:4px;background:#fff}table{width:100%;border-collapse:collapse;font-size:13px;text-align:left}th{font-weight:500;color:var(--muted);font-size:11px;background:var(--paper)}th,td{padding:18px 20px;border-bottom:1px solid var(--rule);vertical-align:top}tbody tr:last-child td{border-bottom:0}td a{color:var(--accent);white-space:nowrap}td small{display:block;color:var(--muted);font-size:11px}td 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p{margin-bottom:18px}.standard-form .helptext{display:block;font-size:11px;color:var(--muted);margin-top:8px}.standard-form ul{font-size:11px;color:var(--muted);padding-left:20px}.standard-form input{margin-bottom:6px}.errorlist{color:var(--bad)!important;font-size:12px!important;padding-left:20px}.account-tools{display:grid;grid-template-columns:1fr 1fr;gap:40px;padding-bottom:32px;margin-bottom:32px;border-bottom:1px solid var(--rule)}.account-tools>section{min-width:0}.account-tools p{font-size:13px}.account-tools a{font-size:12px;color:var(--accent)}.account-tools form{margin-top:16px}.account-tools input[type=file]{font-size:12px}.account-actions{display:flex;gap:24px}.account-actions summary{color:var(--accent);cursor:pointer;font-size:12px;padding:8px 0}.account-actions details form{min-width:190px}.login-layout{display:grid;grid-template-columns:1.1fr 1fr;min-height:calc(100dvh - 140px);align-items:center;gap:100px;max-width:1040px;margin:auto}.login-story{padding:40px 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