:root{--bg:#f6f7f3;--surface:#fff;--ink:#25362f;--muted:#718076;--line:#dce3da;--accent:#245f4d;--soft:#e8eee6;--warm:#a4772f;--danger:#ac4337;--font:18px;color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none;line-height:1.6;color:var(--ink);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);background:var(--surface);color:var(--ink);min-height:46px;border-radius:9px;padding:9px 17px;transition:background .15s,transform .15s}button:hover{background:var(--soft)}button:active{transform:translateY(1px)}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #87ac98;outline-offset:3px}button.primary{background:var(--accent);border-color:var(--accent);color:#fff}button.primary:hover{filter:brightness(1.1)}button.quiet{background:transparent;border-color:transparent;color:var(--muted)}a{color:var(--accent)}h1,h2,h3,p{margin-top:0}h1{font-size:32px;line-height:1.4;letter-spacing:-.02em;font-weight:650}h2{font-size:20px;font-weight:650}h3{font-size:16px;font-weight:600}.muted{color:var(--muted)}.small{font-size:13px}.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:9px}.row{display:flex;align-items:center;gap:12px}.between{justify-content:space-between}.wrap{flex-wrap:wrap}.gap{height:22px}.primary-link{border:0;padding:0;min-height:32px;color:var(--accent);background:none;font-weight:600}.pill{font-size:12px;padding:4px 9px;border-radius:5px;background:var(--soft);color:var(--accent);white-space:nowrap}.warning{border-left:3px solid #c09a49;padding:10px 14px;background:#fbf4df;color:#715122;font-size:14px}.empty{padding:45px 12px;color:var(--muted);text-align:center}.boot{padding:80px;text-align:center}.badge{background:var(--accent);color:white;border-radius:50%;display:inline-grid;place-items:center;width:26px;height:26px;font-size:12px}
.shell{display:grid;grid-template-columns:224px minmax(0,1fr);min-height:100vh}.sidebar{background:var(--surface);border-right:1px solid var(--line);padding:30px 22px;position:fixed;inset:0 auto 0 0;width:224px;display:flex;flex-direction:column;z-index:10}.brand{display:flex;gap:11px;align-items:center;margin-bottom:44px}.brand img{width:39px;height:39px}.brand strong{font-size:17px}.brand small{font-size:11px;color:var(--muted);display:block;letter-spacing:.12em}.nav{display:flex;flex-direction:column;gap:8px}.nav button{display:flex;align-items:center;gap:14px;text-align:left;background:transparent;border:0;font-size:15px;padding:12px 15px;color:var(--muted)}.nav button.active{background:var(--soft);color:var(--accent);font-weight:600}.nav b{font-size:17px;width:20px;font-weight:400}.sidebar-foot{margin-top:auto;border-top:1px solid var(--line);padding-top:20px;font-size:12px;color:var(--muted)}.content{grid-column:2;min-width:0}.topbar{height:78px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 44px}.topbar-title{font-size:13px;color:var(--muted)}.sync{font-size:12px;display:flex;align-items:center;gap:7px}.sync-dot{width:7px;height:7px;border-radius:50%;background:#50886b}.sync-dot.pending{background:#c4913f}.main{max-width:1220px;padding:36px 44px 70px;margin:0 auto}.page-title{margin-bottom:26px}.page-title h1{margin-bottom:8px}.page-title p{font-size:14px;color:var(--muted);margin-bottom:0}
.welcome{display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:32px;align-items:center;border-bottom:1px solid var(--line);padding:12px 0 32px}.welcome h1{font-size:36px;margin-bottom:10px}.welcome .countdown{display:flex;align-items:baseline;gap:8px}.countdown strong{font-size:55px;font-weight:500;letter-spacing:-.05em}.start-actions{display:flex;gap:10px;margin-top:25px;flex-wrap:wrap}.start-actions .primary{padding:13px 27px}.metric-line{display:grid;grid-template-columns:repeat(4,1fr);padding:27px 0;border-bottom:1px solid var(--line)}.metric{padding:0 22px;border-right:1px solid var(--line)}.metric:first-child{padding-left:0}.metric:last-child{border:0}.metric strong{display:block;font-size:29px;font-weight:550}.metric span{font-size:13px;color:var(--muted)}.dashboard-bottom{display:grid;grid-template-columns:1.25fr 1fr;gap:38px;margin-top:32px}.plan-row{display:flex;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--line)}.plan-row strong{font-size:15px}.plan-row small{display:block;color:var(--muted);font-size:12px;margin-top:4px}.progress{height:11px;border-radius:5px;overflow:hidden;display:flex;background:var(--line);margin:25px 0 18px}.segment{height:100%;min-width:0}.legend{display:grid;grid-template-columns:1fr 1fr;gap:12px;font-size:13px}.legend i{display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:7px}.footnote{color:var(--muted);font-size:12px;line-height:1.8;margin-top:18px}
.filters{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:12px;margin-bottom:24px}.field-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.field{display:block;font-size:13px;color:var(--muted)}.field input,.field select,.field textarea{display:block;margin-top:7px;width:100%;min-height:45px;border:1px solid var(--line);border-radius:7px;padding:10px 11px;background:var(--surface);color:var(--ink);font-size:15px}.field textarea{min-height:120px;resize:vertical;line-height:1.8}.check{display:flex;align-items:center;gap:9px;font-size:14px;min-height:42px}.check input{width:18px;height:18px;accent-color:var(--accent)}.chips{display:flex;gap:8px;flex-wrap:wrap}.chips button{font-size:14px}.chips .chosen{background:var(--accent);color:white;border-color:var(--accent)}.question-list{list-style:none;padding:0;margin:0}.question-list li{display:grid;grid-template-columns:70px 1fr auto;gap:18px;align-items:center;padding:21px 0;border-bottom:1px solid var(--line)}.question-list .qno{font-size:13px;color:var(--muted)}.question-list p{font-size:15px;line-height:1.7;margin:5px 0}.question-list .meta{font-size:12px;color:var(--muted)}
.practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:30px;align-items:start}.practice-head{margin-bottom:24px}.practice-head strong{font-size:17px}.thin-progress{height:4px;background:var(--line);margin:16px 0 28px;overflow:hidden}.thin-progress div{height:100%;background:var(--accent)}.question-paper{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:30px}.q-tags{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:20px}.q-stem{font-size:calc(var(--font) + 2px);font-weight:550;line-height:1.9;white-space:pre-wrap;margin-bottom:24px}.options{display:grid;gap:12px}.option{display:flex;gap:14px;align-items:flex-start;text-align:left;width:100%;padding:15px 17px;min-height:58px;font-size:var(--font);line-height:1.7}.option b{border:1px solid var(--line);border-radius:6px;min-width:28px;height:29px;text-align:center;line-height:27px;font-size:14px;font-weight:500}.option.selected{background:var(--soft);border-color:var(--accent)}.option.correct{border-color:#4f8662;background:#edf5ed}.option.incorrect{border-color:#bc7163;background:#fff1eb}.option:disabled{opacity:1;color:var(--ink)}.answer-actions{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:24px;flex-wrap:wrap}.feedback{margin-top:24px;padding-top:24px;border-top:1px solid var(--line)}.feedback .result{font-size:18px;font-weight:650;color:var(--accent)}.feedback .result.wrong{color:var(--danger)}.feedback p{font-size:15px}.basis{white-space:pre-wrap;font-size:15px;line-height:1.9;margin-top:12px;color:var(--muted)}.answer-original{font-size:var(--font);line-height:2.05;white-space:pre-wrap}.memory{margin-bottom:24px;border-left:3px solid #bc9950;padding:3px 0 3px 18px}.memory .anchor{font-size:18px;font-weight:600}.memory ol{padding-left:22px;margin:12px 0}.memory li{margin:9px 0;line-height:1.8;font-size:15px}.memory li span{padding:2px 5px;border-radius:3px}mark{font-weight:650;padding:2px 3px;border-radius:3px;box-decoration-break:clone;-webkit-box-decoration-break:clone}.tone-0{background:#fff0b4;color:#684609}.tone-1{background:#dcedff;color:#174d7d}.tone-2{background:#e8dfff;color:#5c3d89}.tone-3{background:#d9f0e2;color:#205c3b}.plain mark{color:inherit;background:none;padding:0;font-weight:400}.self-rating{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}.answer-sidebar{font-size:13px}.answer-sidebar h3{margin-bottom:14px}.answer-card{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;max-height:310px;overflow:auto;padding:3px}.answer-card button{min-height:37px;height:37px;padding:0;border-radius:6px;font-size:12px}.answer-card button.current{outline:2px solid var(--accent)}.answer-card button.done{background:var(--soft);border-color:#84a792}.answer-card button.bad{background:#ffebe5;border-color:#ce9c8a}.side-box{padding-bottom:25px;margin-bottom:22px;border-bottom:1px solid var(--line)}.note-area{width:100%;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:7px;padding:11px;min-height:120px;resize:vertical;font-size:14px;line-height:1.7}.source-details{font-size:12px;color:var(--muted);margin-top:20px}summary{cursor:pointer}.auth{max-width:440px;margin:9vh auto;padding:28px}.auth img{width:48px}.auth h1{font-size:28px;margin-top:26px}.auth .field{margin:18px 0}.auth button.primary{width:100%;margin-top:10px}.error-text{color:var(--danger);font-size:14px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;border-bottom:1px solid var(--line);padding:13px 12px}th{font-weight:500;color:var(--muted)}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}.settings-box{padding-bottom:28px;border-bottom:1px solid var(--line);margin-bottom:24px}.settings-box .field{margin-bottom:18px}.conflict{margin-top:15px;padding:12px;border:1px solid #cba75f;white-space:pre-wrap;font-size:14px}.session-list button{display:block;width:100%;text-align:left;margin-top:10px}.result-large{font-size:48px;font-weight:550;margin:12px 0}.sticky-actions{margin-top:24px;display:flex;gap:10px;justify-content:flex-end}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#203a2e;color:white;padding:12px 22px;border-radius:9px;font-size:14px;z-index:100;max-width:90vw;display:none;box-shadow:0 4px 16px #0002}
[data-theme=dark]{--bg:#17201c;--surface:#202b25;--ink:#e2e9df;--muted:#9ca99e;--line:#38443b;--accent:#34795e;--soft:#2d4336;color-scheme:dark}[data-theme=dark] .option.correct{background:#233e2a}[data-theme=dark] .option.incorrect{background:#4c2b25}[data-theme=dark] .answer-card button.bad{background:#4c2b25}[data-theme=dark] .warning{background:#3e3622;color:#ead69c}
@media(max-width:1100px){.sidebar{width:190px;padding:26px 15px}.shell{grid-template-columns:190px minmax(0,1fr)}.main{padding:28px}.topbar{padding:0 28px}.practice-layout{grid-template-columns:minmax(0,1fr) 200px;gap:20px}.question-paper{padding:23px}.dashboard-bottom{gap:25px}}
@media(max-width:820px){.shell{display:block}.sidebar{position:fixed;inset:auto 0 0;width:auto;height:70px;padding:5px 12px calc(5px + env(safe-area-inset-bottom));border-right:0;border-top:1px solid var(--line)}.sidebar .brand,.sidebar-foot{display:none}.nav{flex-direction:row;gap:0;justify-content:space-around}.nav button{flex-direction:column;gap:0;font-size:10px;min-height:52px;padding:4px 8px;border-radius:7px}.nav b{font-size:18px;text-align:center}.topbar{height:62px;padding:0 22px}.main{padding:25px 22px 100px}.welcome{grid-template-columns:1fr 100px;gap:14px}.welcome h1{font-size:29px}.countdown strong{font-size:45px}.dashboard-bottom{grid-template-columns:1fr}.metric{padding:0 11px}.metric strong{font-size:25px}.metric span{font-size:11px}.field-grid{grid-template-columns:1fr 1fr}.practice-layout{grid-template-columns:1fr}.answer-sidebar{display:grid;grid-template-columns:1fr 1fr;gap:20px}.answer-card{max-height:170px;grid-template-columns:repeat(8,1fr)}.settings-grid{grid-template-columns:1fr}.question-list li{grid-template-columns:50px 1fr;gap:12px}.question-list li>button{grid-column:2;justify-self:start}.question-paper{padding:23px}.q-stem{font-size:var(--font)}.welcome .eyebrow{font-size:10px}}
@media(max-width:480px){.main{padding:22px 16px 95px}.topbar{padding:0 16px}.topbar-title{font-size:11px}.sync{font-size:11px}.welcome{grid-template-columns:1fr 73px}.welcome h1{font-size:26px}.welcome p{font-size:13px}.countdown strong{font-size:40px}.field-grid{grid-template-columns:1fr}.filters{padding:18px}.question-paper{padding:19px 16px}.option{padding:13px 12px;gap:10px}.answer-sidebar{grid-template-columns:1fr}.answer-actions{align-items:stretch}.answer-actions>button{flex:1}.practice-head .row{gap:6px}.practice-head button{padding:8px 10px;font-size:13px}.metric-line{gap:0}.metric strong{font-size:23px}.auth{margin-top:4vh}.answer-card{grid-template-columns:repeat(8,1fr)}h1{font-size:28px}.self-rating button{flex:1;padding:10px;font-size:14px}.legend{font-size:12px}}
@media(prefers-reduced-motion:reduce){button{transition:none}}