:root{--bg:#fafafa;--panel:#fff;--ink:#0d0d0d;--mute:#6b6b6b;--line:#d9d9d9;--acc:#c8102e;--acc-l:#fbe7ea;--ok:#0b6b3a;--ok-l:#e3f3ea;--flag:#9a6700;--flag-l:#fff4d6;--warn:#ffb020;font-family:"Inter","Segoe UI",system-ui,sans-serif;color:var(--ink);background:var(--bg);font-size:16px;line-height:1.45}
*{box-sizing:border-box}body{margin:0}button{font:600 15px/1.4 "Inter","Segoe UI",system-ui,sans-serif;min-height:44px;border:1px solid var(--ink);border-radius:0;background:var(--panel);color:var(--ink);padding:10px 18px;cursor:pointer}button:hover{filter:brightness(.95)}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible{outline:2px solid var(--acc);outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:28px}h2{font-size:20px}h3{font-size:16px}img{display:block;max-width:100%;height:auto;image-rendering:auto}small{font-size:12px}.dark{background:var(--ink);color:white}.red{background:var(--acc);border-color:var(--acc);color:white}.muted{color:var(--mute)}.yes{color:var(--ok);font-weight:700}.no{color:var(--acc);font-weight:700}.actions{display:flex;gap:10px;flex-wrap:wrap}.loading{padding:30px}.start{width:100%;margin-top:18px}.brand{padding:28px max(24px,calc((100% - 1120px)/2));background:var(--ink);color:white}.brand h1{margin-bottom:6px}.brand p{margin:0;color:#ccc}.home-columns{max-width:1168px;padding:36px 24px;display:grid;grid-template-columns:1.15fr 1fr;gap:40px;margin:auto}.mode-switch{display:flex;margin-bottom:22px}.mode-switch button{flex:1}.mode-switch [aria-pressed=true]{background:var(--ink);color:white}.sources{display:grid;gap:8px}.source{text-align:left;border-color:var(--line);border-left-width:4px;padding:14px 16px;font-weight:500;width:100%}.source[aria-pressed=true]{border-color:var(--ink);border-left-color:var(--acc);font-weight:700}.panel{border:1px solid var(--line);padding:22px;background:var(--panel);margin-bottom:20px}.recent{display:grid;grid-template-columns:1fr auto;gap:3px 16px;padding:12px 0;border-top:1px solid var(--line)}.recent strong{grid-column:1}.recent small{color:var(--mute)}.tag{grid-column:2;grid-row:1/3;align-self:center;padding:4px 8px;font-size:12px;font-weight:800}.pass{background:var(--ok);color:white}.fail{background:var(--acc);color:white}footer{border-top:1px solid var(--line);max-width:1120px;margin:0 auto;padding:24px 0;color:var(--mute);font-size:13px}footer p:last-child{margin-bottom:0}
.exam-shell{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:100dvh}.rail{background:var(--ink);color:white;padding:18px 16px;display:flex;flex-direction:column;gap:18px}.clock{font:700 34px ui-monospace,Consolas,monospace;letter-spacing:.02em}.clock small,.practice-label small{display:block;font:12px/1.5 system-ui,sans-serif;color:#aaa;letter-spacing:.06em}.clock.urgent{color:var(--warn)}.practice-label{font-size:22px;font-weight:800}.question-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:5px}.question-grid button{border:1px solid #555;color:#ccc;background:transparent;padding:4px 0;min-height:36px;font:12px ui-monospace,Consolas,monospace}.question-grid .answered{background:white;color:var(--ink);border-color:white}.question-grid .flagged{background:var(--warn);color:var(--ink);border-color:var(--warn)}.question-grid .current{outline:2px solid var(--acc);outline-offset:1px}.legend{font-size:11px;color:#aaa;margin:14px 0 0;line-height:1.8}.rail-submit{margin-top:auto}.phone-count,.index-open{display:none}.exam-main{min-width:0;padding:22px 30px;display:flex;flex-direction:column}.meta{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;color:var(--mute);font-size:14px;border-bottom:2px solid var(--ink);padding-bottom:8px}.meta strong{color:var(--ink)}.question-wrap{display:grid;gap:24px;margin:24px 0}.question-wrap.with-picture{grid-template-columns:minmax(0,1fr) minmax(0,300px)}.question-text{font-size:23px;font-weight:600;line-height:1.35;margin:0}.question-image{width:100%;max-width:300px;border:1px solid var(--line)}.picture small{display:block;color:var(--mute);margin-top:6px}.option{display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;width:100%;text-align:left;border:1px solid var(--line);border-left:4px solid var(--line);padding:0;margin:0 0 8px;font-weight:400;font-size:16px;min-height:56px}.key{font-weight:800;text-align:center;color:var(--mute)}.option-content{display:block;padding:12px 14px 12px 0;overflow-wrap:anywhere}.option-image{max-width:100%}.option.selected{border-color:var(--ink);border-left-color:var(--acc)}.option.selected .key{color:var(--acc)}.option.correct{background:var(--ok-l);border-left-color:var(--ok)}.option.wrong{background:var(--acc-l)}.answer-mark{font-size:22px;font-weight:800;padding:10px;color:var(--acc)}.correct .answer-mark{color:var(--ok)}.exam-nav{display:flex;gap:10px;margin-top:auto;padding-top:22px}.exam-nav .next{margin-left:auto}.flag-on{background:var(--flag-l);color:var(--flag);border-color:var(--flag)}.warning{background:var(--warn);color:var(--ink);font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 14px;margin-bottom:16px}.warning button{background:transparent;border:0;padding:4px 10px}.exam-main>.warning{margin:-22px -30px 20px}.results>.warning{margin:0}
dialog{border:2px solid var(--ink);border-radius:0;padding:24px;max-width:min(600px,calc(100vw - 32px));max-height:calc(100dvh - 32px);overflow:auto;color:var(--ink);background:var(--panel)}dialog::backdrop{background:#0009}dialog h2{margin-bottom:8px}dialog section{margin:22px 0}.number-links{display:flex;gap:6px;flex-wrap:wrap}.number-links button{min-width:44px;padding:8px}.sheet-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:20px}.index-sheet{background:var(--ink);color:white}.index-sheet .question-grid button{min-height:44px}.result-header{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:24px 28px;border-bottom:2px solid var(--ink);flex-wrap:wrap}.verdict{font-size:28px;font-weight:800;padding:14px 22px;letter-spacing:.06em}.numbers{display:flex;gap:30px;flex:1}.numbers div{font-size:13px;color:var(--mute)}.numbers strong{display:block;font:700 26px/1.5 ui-monospace,Consolas,monospace;color:var(--ink)}.review{padding:24px 28px}.review h1{font-size:20px}.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.filters button{border-color:var(--line)}.filters [aria-pressed=true]{background:var(--ink);color:white;border-color:var(--ink)}.review-row{display:grid;grid-template-columns:40px minmax(0,1fr) 200px;gap:14px;padding:18px 0;border-bottom:1px solid var(--line);font-size:15px}.review-number{color:var(--acc)}.review-question{margin-bottom:8px}.review .question-image{max-width:160px}.review .picture{margin-bottom:10px}.correct-answer{color:var(--ok);font-size:14px}.correct-answer .option-content{display:inline;padding:0}.correct-answer img{margin-top:8px}
.brand{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand .lang-switch button{background:transparent;color:white;border-color:#666}.brand .lang-switch [aria-pressed=true]{background:white;color:var(--ink);border-color:white}.lang-switch{display:flex}.lang-switch button{flex:1;border-color:var(--line);font-weight:500}.lang-switch [aria-pressed=true]{background:var(--ink);color:white;border-color:var(--ink);font-weight:700}.lang-switch.compact{flex-basis:auto}.lang-switch.compact button{flex:none;min-height:32px;padding:4px 10px;font-size:13px}.zh{display:block;font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif}.question-text .zh{font-size:.85em;font-weight:500;margin-top:6px}.option-content .zh{color:var(--mute);margin-top:2px}.zh.only{color:inherit;margin-top:0;font-size:inherit}.explanation{border-left:4px solid var(--ink);background:var(--panel);padding:10px 14px;margin:4px 0 0;font-size:15px}.explanation strong{display:block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--mute)}.explanation p{margin:2px 0 0}.explanation .zh{margin-top:4px}.explanation .zh.only{margin-top:0}.review .explanation{margin-top:10px;font-size:14px}.review-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}.review-heading h1{margin:0}
@media(max-width:899px){.brand{padding:22px 18px}.brand h1{font-size:26px}.brand p{font-size:14px}.home-columns{grid-template-columns:1fr;padding:24px 18px;gap:24px}footer{margin:0 18px;padding:20px 0}.home-aside .panel:last-child{margin-bottom:0}.exam-shell{display:flex;flex-direction:column}.rail{flex-direction:row;align-items:center;padding:10px 14px;gap:14px}.clock{font-size:24px}.clock small,.desktop-index,.rail-submit{display:none}.practice-label{font-size:16px}.practice-label small{font-size:10px}.phone-count{display:block;color:#bbb;font-size:13px;white-space:nowrap}.index-open{display:block;margin-left:auto;background:transparent;color:white;border-color:#666;padding:8px 12px}.exam-main{padding:14px;flex:1}.exam-main>.warning{margin:-14px -14px 14px}.meta{font-size:12px}.question-wrap,.question-wrap.with-picture{grid-template-columns:1fr;gap:12px;margin:18px 0}.question-text{font-size:19px}.question-image{max-width:100%;width:100%}.exam-nav{gap:8px}.exam-nav button{padding:10px 12px}.desktop-label{display:none}.exam-nav button:not(.next){min-width:44px}.index-sheet{position:fixed;inset:0;width:100%;height:100dvh;max-width:none;max-height:none;margin:0;padding:20px}.index-sheet .question-grid{gap:8px}.result-header{padding:18px;gap:18px}.numbers{flex-basis:100%;gap:18px;flex-wrap:wrap}.numbers strong{font-size:22px}.result-header>.actions{width:100%}.review{padding:20px 18px}.filters{gap:6px}.filters button{padding:10px 12px}.review-row{grid-template-columns:28px minmax(0,1fr);gap:8px}.review-row>div:last-child{grid-column:2}.recent{gap:4px 8px}dialog{padding:18px}.meta .lang-switch,.brand .lang-switch{flex-basis:100%}.lang-switch.compact button{flex:1;min-height:44px}}
.wrong-source{margin-top:8px}.wrong-source:disabled{opacity:1;color:var(--mute);border-left-color:var(--line);border-style:dashed}.wrongbook p{margin-bottom:12px}.book-note{font-size:14px;color:var(--mute);margin:-4px 0 10px}.book-summary{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:14px 28px;border-bottom:1px solid var(--line);font-size:15px}.book-summary span{font-weight:600}
@media(max-width:899px){.book-summary{padding:12px 18px}.book-summary button{width:100%}}
.correct-answer .zh.only{display:inline}
.sync-link{width:100%;font:13px ui-monospace,Consolas,monospace;padding:10px;border:1px solid var(--line);margin-bottom:16px;min-height:44px}
.book-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:-4px 0 10px}.book-row .book-note{margin:0}.extra-toggle{border-color:var(--line);font-weight:500;font-size:14px;padding:8px 14px}.extra-toggle[aria-pressed=true]{color:var(--mute)}.review-row .extra-toggle{display:block;margin-top:10px}.extra-nav{border-color:var(--line);font-weight:500;white-space:nowrap}.extra-nav.booked{background:var(--ok-l);border-color:var(--ok);color:var(--ok)}@media(max-width:899px){.extra-nav{padding:10px}}