:root{--bg:#f5f6f2;--paper:#fff;--ink:#20302b;--muted:#58655f;--line:#d3dbd4;--accent:#24634a;--accent-dark:#174c37;--soft:#e9f1eb;--warn:#805000;--warn-bg:#fff3d8;--danger:#a63232;--danger-bg:#fcecec;--radius:14px;color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.7;color:var(--ink);background:var(--bg);font-variant-numeric:tabular-nums}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}a{color:var(--accent);text-underline-offset:4px}::selection{background:#cde6d4;color:var(--ink)}:focus-visible{outline:3px solid #bc7824;outline-offset:3px}textarea,input{caret-color:var(--accent)}[hidden]{display:none!important}.skip-link{position:fixed;top:-100px;left:12px;z-index:9;padding:10px;background:white}.skip-link:focus{top:8px}.topbar{border-bottom:1px solid var(--line);background:var(--paper)}.topbar-inner{max-width:1000px;margin:auto;padding:16px 28px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;gap:9px;align-items:center;font-size:18px;font-weight:750;text-decoration:none;color:var(--ink);white-space:nowrap}.brand svg{width:29px;height:29px;color:var(--accent)}.status-wrap{display:flex;align-items:center;gap:14px;font-size:12px;color:var(--muted);flex-wrap:wrap;justify-content:flex-end}.app-shell{max-width:900px;margin:0 auto;padding:36px 28px 0}main{outline:none;min-height:65vh}h1,h2,h3,p{margin:0}h1{font-size:30px;line-height:1.4;font-weight:740;letter-spacing:-.025em}h2{font-size:20px;line-height:1.5}h3{font-size:17px}p+p{margin-top:12px}.intro{margin-bottom:28px}.intro p{color:var(--muted);margin-top:9px;font-size:15px}.stats{display:grid;grid-template-columns:repeat(4,1fr);padding:21px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);gap:16px;margin-bottom:32px}.stat strong{display:block;font-size:26px;line-height:1.3}.stat span{display:block;font-size:12px;color:var(--muted);margin-top:7px}.section{margin-top:32px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:15px}.section-heading span{font-size:13px;color:var(--muted)}.practice-panel{background:var(--paper);padding:24px;border:1px solid var(--line);border-radius:var(--radius)}.filter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.field{display:flex;flex-direction:column;gap:7px;font-size:14px;font-weight:600}select,input[type=text],textarea{width:100%;border:1px solid #aab9af;border-radius:8px;background:white;padding:11px 12px;font-weight:400;min-height:46px}select{padding-right:30px;cursor:pointer}select:hover{border-color:var(--accent)}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 18px;border:1px solid transparent;border-radius:8px;font-weight:650;text-decoration:none;background:var(--accent);color:#fff;line-height:1.5}.button:hover{background:var(--accent-dark)}.button.secondary{background:white;border-color:#aab9af;color:var(--ink)}.button.secondary:hover{background:var(--soft);border-color:var(--accent)}.button.danger{color:var(--danger);border-color:#d5aaaa;background:white}.button:disabled{opacity:.5;cursor:not-allowed}.full{width:100%}.start-row{display:flex;align-items:center;gap:16px;margin-top:22px}.start-row .button{min-width:180px}.helper{font-size:13px;color:var(--muted)}.shortcut-list{border-top:1px solid var(--line)}.shortcut{width:100%;border:0;border-bottom:1px solid var(--line);padding:19px 0;display:flex;justify-content:space-between;align-items:center;text-align:left;background:none;gap:16px}.shortcut:hover{color:var(--accent);background:#ecf1eb}.shortcut strong{font-size:16px;font-weight:600}.shortcut small{display:block;font-size:13px;color:var(--muted);margin-top:3px}.shortcut .count{font-size:14px;font-weight:600;white-space:nowrap}.tools{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}.text-button{background:none;border:0;color:var(--accent);font-weight:600;padding:7px 3px;text-decoration:underline;text-underline-offset:4px;min-height:44px}.notice{margin-bottom:22px;padding:13px 16px;border:1px solid #b7ccb9;border-radius:8px;background:var(--soft);font-size:14px;overflow-wrap:anywhere}.notice.error,.feedback.error{background:var(--danger-bg);border-color:#d9afaf;color:var(--danger)}.warning{padding:15px 17px;background:var(--warn-bg);color:var(--warn);border:1px solid #d4ba7e;border-radius:8px;margin:18px 0;font-size:14px}.warning strong{display:block;margin-bottom:5px}.page-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}.page-head h1{font-size:24px}.page-head p{font-size:13px;color:var(--muted)}.progress-row{display:flex;align-items:center;gap:14px;margin-bottom:18px;font-size:13px;color:var(--muted)}progress{flex:1;width:100%;height:5px;border:0;accent-color:var(--accent)}progress::-webkit-progress-bar{background:#dce4db;border-radius:4px}progress::-webkit-progress-value{background:var(--accent);border-radius:4px}.question{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px}.question-meta{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:18px;font-size:13px;color:var(--muted)}.type-label{color:var(--accent);font-weight:650}.stem{font-size:18px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere;font-weight:500}.case-material{margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid var(--line)}summary{cursor:pointer;font-weight:600;min-height:44px;padding:8px 0}.case-material .prose{font-size:16px;margin-top:12px}.prose{line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere}.options{border:0;margin:24px 0 0;padding:0;display:grid;gap:10px}.options legend{font-size:14px;color:var(--muted);margin-bottom:12px}.option{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border:1px solid var(--line);border-radius:9px;cursor:pointer;min-height:52px;line-height:1.7}.option:hover{border-color:var(--accent);background:#f4f8f4}.option:has(input:checked){border-color:var(--accent);background:var(--soft)}.option:has(input:disabled){cursor:default}.option.is-correct{border-color:var(--accent);background:var(--soft)}.option.is-wrong{border-color:#ce9d9d;background:var(--danger-bg)}.option input{accent-color:var(--accent);width:18px;height:18px;flex:0 0 18px;margin:5px 0 0}.option-key{font-weight:700;min-width:19px}.response-area{margin-top:24px}.response-area textarea{min-height:160px;resize:vertical;line-height:1.8;margin-top:9px}.response-area label{font-size:14px;font-weight:600}.response-area .helper{margin-top:8px}.submit-row{margin-top:22px}.feedback{border-radius:8px;border:1px solid #b7ccb9;background:var(--soft);padding:15px 17px;margin:24px 0 0}.feedback h3{font-size:17px}.answer{margin-top:24px;padding-top:22px;border-top:1px solid var(--line)}.answer h3{margin-bottom:12px}.answer .prose{font-size:16px}.scoring{margin-top:20px;font-size:14px}.scoring ul{padding-left:22px;margin:8px 0}.self-buttons{display:flex;gap:12px;margin-top:20px;flex-wrap:wrap}.self-note{font-size:13px;color:var(--muted);margin-top:12px}.source-details{margin-top:24px;font-size:12px;color:var(--muted);overflow-wrap:anywhere}.source-details p{margin:5px 0}.nav-actions{position:sticky;bottom:0;display:flex;justify-content:space-between;gap:12px;background:var(--bg);padding:18px 0 calc(18px + env(safe-area-inset-bottom));margin-top:8px;border-top:1px solid var(--line);z-index:1}.nav-actions .button{min-width:130px}.history-list{border-top:1px solid var(--line);margin-top:24px}.history-item{padding:21px 0;border-bottom:1px solid var(--line)}.history-item h2{font-size:16px;font-weight:600}.history-item .helper{margin:7px 0}.history-item .preview{font-size:15px;line-height:1.8;margin-bottom:10px}.history-item .button{padding:8px 14px;min-height:44px}.empty{padding:34px 0;color:var(--muted)}.empty h2{color:var(--ink);margin-bottom:9px}.summary-list{padding:0;list-style:none}.summary-list li{display:flex;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid var(--line)}.source-table{overflow:auto;margin-top:18px}table{width:100%;border-collapse:collapse;font-size:13px}th,td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}.help-body h2{margin:28px 0 10px}.help-body p{font-size:15px}.help-body ul{padding-left:23px}.site-footer{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:24px 0;margin-top:40px;color:var(--muted);font-size:12px}.import-preview{padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);margin-top:20px}.loading{padding:40px 0;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:var(--radius);padding:24px;max-width:430px;width:calc(100% - 32px)}dialog::backdrop{background:#20302b66}dialog .tools{margin-bottom:0}dialog h2{margin-bottom:12px}dialog p{font-size:14px}code{font-size:13px;background:#e9eee8;padding:2px 5px;border-radius:3px}
@media(max-width:600px){.topbar-inner{padding:13px 18px}.app-shell{padding:26px 18px 0}h1{font-size:27px}.intro{margin-bottom:22px}.stats{grid-template-columns:repeat(2,1fr);row-gap:20px;margin-bottom:26px}.stat strong{font-size:25px}.filter-grid{grid-template-columns:1fr;gap:14px}.practice-panel{padding:20px}.start-row{flex-direction:column;align-items:stretch;gap:9px}.start-row .button{width:100%}.question{padding:20px 17px}.stem{font-size:17px;line-height:1.9}.option{padding:13px 12px;gap:9px}.page-head{align-items:flex-start}.page-head h1{font-size:22px}.question-meta{font-size:12px}.status-wrap{font-size:11px;gap:5px}.status-wrap .text-button{font-size:12px}.brand{font-size:17px}.self-buttons{display:grid;grid-template-columns:1fr 1fr;gap:10px}.self-buttons .button{padding:10px}.nav-actions .button{flex:1;min-width:0}.site-footer{font-size:11px;align-items:flex-start}.section-heading span{font-size:12px}.case-material .prose{font-size:15px}.shortcut{padding:17px 0}.tools .button{flex:1}.section{margin-top:28px}}
@media(prefers-reduced-motion:no-preference){button,a{transition:background-color 120ms ease-out,border-color 120ms ease-out}}@media print{.topbar,.nav-actions,.site-footer,button{display:none}.app-shell{max-width:none}.question{border:0;padding:0}}