:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#192b2b;background:#f3f6f6;font-size:16px;font-synthesis:none;--green:#164b43;--lime:#d5f575;--muted:#5f7373;--line:#dce5e4;--red:#a12e39}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;border-radius:10px;padding:13px 20px;background:var(--green);color:white;font-weight:650;min-height:46px}button:hover{filter:brightness(1.08)}button:disabled{opacity:.5;cursor:default}button.secondary{background:#edf3f2;color:var(--green);border:1px solid var(--line)}button.text{background:transparent;color:var(--muted);padding:8px 10px}button.small{padding:9px 14px;font-size:.875rem;min-height:40px}a{color:var(--green);overflow-wrap:anywhere}input,select{width:100%;min-height:48px;padding:12px;border:1px solid #bbcaca;border-radius:9px;background:white;color:inherit}label{font-size:.875rem;font-weight:600;display:block;margin-bottom:8px}input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid #6aa99b;outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:2.1rem;letter-spacing:-1px;line-height:1.25;margin-bottom:12px}h2{font-size:1.35rem;line-height:1.4}h3{font-size:1.05rem}p{line-height:1.75}.muted{color:var(--muted)}.eyebrow{font-size:.8rem;font-weight:700;letter-spacing:2px;color:var(--muted);margin-bottom:14px}.topbar{height:80px;border-bottom:1px solid var(--line);background:white;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1160px)/2));gap:20px}.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:1.15rem;white-space:nowrap}.brand img{width:36px;height:36px}.topnav{display:flex;align-items:center;gap:10px}.topnav button.active{background:#e4eeeb;color:var(--green)}.username{max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.875rem}.container{max-width:1160px;margin:0 auto;padding:38px 24px 64px}.welcome{display:flex;justify-content:space-between;align-items:center;margin-bottom:26px;gap:20px}.welcome p{margin:0}.badge{display:inline-block;border:1px solid var(--line);border-radius:30px;padding:7px 12px;font-size:.8rem;color:var(--muted);white-space:nowrap}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:28px}.stat{background:white;border:1px solid var(--line);padding:22px;border-radius:12px}.stat strong{display:block;font-size:2rem;line-height:1.2;margin-bottom:8px;font-variant-numeric:tabular-nums}.stat span{font-size:.875rem;color:var(--muted)}.grid{display:grid;grid-template-columns:1.08fr 1fr;gap:22px}.panel{background:white;border:1px solid var(--line);border-radius:16px;padding:28px}.exam-panel{background:var(--green);color:white;border-color:var(--green);position:relative}.exam-panel .eyebrow{color:#b9d5ce}.exam-panel h2{font-size:1.65rem}.exam-panel p{color:#dae7e3}.exam-meta{display:flex;gap:24px;margin:25px 0;border-top:1px solid #ffffff2b;border-bottom:1px solid #ffffff2b;padding:22px 0}.exam-meta strong{display:block;font-size:2rem}.exam-meta span{font-size:.875rem;color:#c1d8d1}.exam-panel button{background:var(--lime);color:#153e34;width:100%;margin-top:16px}.rules{font-size:.875rem;line-height:1.9}.fields{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:22px}.field.full{grid-column:1/-1}.actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.wide{width:100%}.section-title{display:flex;justify-content:space-between;align-items:center;margin:34px 0 16px;gap:10px}.section-title h2{margin:0}.history{background:white;border:1px solid var(--line);border-radius:14px;overflow:hidden}.history-row{width:100%;display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:16px;align-items:center;border-radius:0;border-bottom:1px solid var(--line);padding:20px 24px;text-align:left;background:white;color:inherit;font-weight:400}.history-row:last-child{border-bottom:0}.history-row small{display:block;color:var(--muted);margin-top:6px;font-size:.8rem}.history-row strong{font-size:1.2rem}.empty{padding:32px;text-align:center;color:var(--muted);line-height:1.8}.resume{padding:18px 22px;border:1px solid #bacf7e;border-radius:12px;background:#f3f9df;display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}.resume p{margin:0;font-size:.875rem}.auth{min-height:100vh;display:grid;grid-template-columns:1.05fr 1fr}.auth-intro{background:var(--green);color:white;padding:70px max(40px,calc((100vw - 1120px)/2));display:flex;flex-direction:column;justify-content:center}.auth-intro .brand{margin-bottom:68px}.auth-intro h1{font-size:2.8rem;line-height:1.35;max-width:440px}.auth-intro p{color:#c2d8d2;max-width:440px}.auth-intro .large-number{font-size:5rem;color:var(--lime);font-weight:750;letter-spacing:-4px;margin-top:25px}.auth-form{align-self:center;max-width:450px;padding:40px;width:100%;justify-self:center}.auth-form .field{margin-bottom:20px}.auth-form h2{font-size:1.75rem}.auth-switch{margin-top:20px;text-align:center;font-size:.875rem}.error{color:var(--red);font-size:.875rem;line-height:1.6;min-height:24px}.exam-header{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-bottom:24px}.exam-header h1{font-size:1.65rem;margin:0}.clock{font-size:1.55rem;font-weight:750;font-variant-numeric:tabular-nums;color:var(--green)}.clock.urgent{color:var(--red)}.exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:22px;align-items:start}.question-card{padding:32px;min-height:450px}.q-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;color:var(--muted);font-size:.875rem;margin-bottom:22px}.type{background:#e8f0ed;color:var(--green);border-radius:5px;padding:5px 8px;font-weight:650}.question-text{font-size:1.18rem;line-height:1.9;font-weight:650;white-space:pre-wrap;margin-bottom:26px;overflow-wrap:anywhere}.options{display:flex;flex-direction:column;gap:12px}.option{width:100%;display:flex;align-items:flex-start;gap:13px;text-align:left;background:white;color:#263838;border:1.5px solid var(--line);font-weight:400;padding:15px 17px;line-height:1.6;overflow-wrap:anywhere}.option .letter{border:1px solid #ccd8d5;min-width:28px;height:28px;display:grid;place-items:center;border-radius:6px;font-size:.875rem;flex-shrink:0}.option.selected{border-color:var(--green);background:#edf5f1}.option.selected .letter{background:var(--green);color:white;border-color:var(--green)}.option.correct{border-color:#287c58;background:#eaf7ef}.option.incorrect{border-color:#b85861;background:#fff0f1}.option:disabled{opacity:1;cursor:default}.q-footer{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:28px;padding-top:22px;border-top:1px solid var(--line);flex-wrap:wrap}.save{color:var(--muted);font-size:.8rem}.answer-map{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:20px 0}.answer-map button{padding:0;min-height:38px;border-radius:7px;background:#f0f4f3;color:#5f7373;font-size:.85rem;border:1px solid transparent}.answer-map button.done{background:#dceee4;color:#205540}.answer-map button.bad{background:#fbe0e2;color:#a12e39}.answer-map button.current{border:2px solid var(--green);font-weight:800}.legend{font-size:.8rem;color:var(--muted);line-height:1.7}.answer-sheet h3{margin:0}.answer-sheet summary{list-style:none;font-weight:700;cursor:pointer}.answer-sheet summary::-webkit-details-marker{display:none}.explanation{margin-top:24px;padding:22px;border-radius:10px;background:#f2f6f4;line-height:1.8;overflow-wrap:anywhere}.explanation .verdict{font-weight:750;color:#236541}.explanation .verdict.bad{color:var(--red)}.explanation p{margin:12px 0}.explanation .source{font-size:.85rem;color:var(--muted);border-top:1px solid var(--line);padding-top:12px}.result-banner{background:var(--green);color:white;padding:30px;border-radius:16px;margin-bottom:24px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}.result-score{font-size:3.5rem;color:var(--lime);font-weight:750;line-height:1.1}.result-score small{font-size:1.1rem;font-weight:400;color:#c3d9d1}.result-banner p{margin:10px 0 0;color:#c3d9d1}.result-banner button{background:var(--lime);color:var(--green)}.result-filter{margin-bottom:20px;display:flex;gap:10px}.footnote{font-size:.8rem;line-height:1.8;color:var(--muted);margin-top:26px}.boot{padding:70px;text-align:center;color:var(--muted)}#toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);background:#1e3532;color:white;padding:14px 22px;border-radius:10px;max-width:90vw;z-index:100;box-shadow:0 5px 25px #0002;display:none}dialog{border:1px solid var(--line);border-radius:16px;padding:28px;max-width:440px;width:calc(100% - 32px)}dialog::backdrop{background:#10262288}dialog p{color:var(--muted)}
@media(max-width:800px){.topbar{height:auto;min-height:70px;padding:14px 20px;flex-wrap:wrap;gap:8px}.topnav{gap:2px}.username{max-width:100px}.container{padding:26px 18px 50px}.grid{grid-template-columns:1fr}.stats{gap:10px;grid-template-columns:repeat(2,1fr)}.stat{padding:18px}.welcome{align-items:flex-start}.welcome .badge{display:none}h1{font-size:1.7rem}.panel{padding:23px}.exam-layout{display:flex;flex-direction:column}.question-card{width:100%;padding:24px 20px;min-height:0}.answer-sheet{width:100%}.answer-map{grid-template-columns:repeat(10,1fr)}.auth{grid-template-columns:1fr}.auth-intro{padding:30px 28px}.auth-intro .brand{margin-bottom:25px}.auth-intro h1{font-size:1.9rem;margin-bottom:10px}.auth-intro p{margin:0}.auth-intro .large-number{display:none}.auth-form{padding:30px 26px}.history-row{grid-template-columns:1fr auto;padding:18px;gap:10px}.history-row .elapsed{display:none}.history-row .arrow{display:none}.exam-header{align-items:flex-start}.exam-header h1{font-size:1.4rem}.clock{font-size:1.3rem}.resume{align-items:flex-start}.result-banner{padding:24px}.q-footer .actions{gap:8px}.q-footer button{padding:12px 15px}}
@media(max-width:430px){.topbar{padding:12px 16px}.topnav button{font-size:.8rem;padding:8px}.username{display:none}.answer-map{grid-template-columns:repeat(6,1fr)}.exam-meta{gap:22px}.fields{gap:12px}.option{padding:13px}.brand{font-size:1rem}.brand img{width:30px;height:30px}.result-score{font-size:3rem}.q-footer{align-items:flex-start}.q-footer .save{width:100%}}
.number-unit{font-size:1rem;letter-spacing:0}.auth-intro .eyebrow,.result-banner .eyebrow{color:#bfd9d1}
@media(prefers-reduced-motion:no-preference){button{transition:background .15s,border-color .15s}}

/* Learning library and release notes */
.discovery-strip{display:grid;grid-template-columns:1.35fr 1fr;gap:14px;margin:0 0 28px}
.discovery-card{min-height:98px;padding:18px 20px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:15px;text-align:left;border:1px solid #d8d0ee;background:#f1edff;color:#39276d;box-shadow:0 4px 0 #ded6f4}
.discovery-card.update-entry{background:#fff3d8;border-color:#efd7a1;color:#704914;box-shadow:0 4px 0 #f0ddb4}
.discovery-icon{font-size:2rem}.discovery-card strong{display:block;font-size:1.08rem}.discovery-card small{display:block;margin-top:5px;font-weight:500;line-height:1.5;opacity:.75}.discovery-card b{font-size:.85rem;white-space:nowrap}
.knowledge-hero,.updates-hero{border-radius:22px;padding:36px 38px;margin-bottom:24px;background:linear-gradient(135deg,#4e35bd,#7752d6);color:white;box-shadow:0 7px 0 #34228c}
.knowledge-hero{display:flex;justify-content:space-between;align-items:center;gap:30px}.knowledge-hero p,.updates-hero p{margin:0;color:#eee9ff}.knowledge-hero .eyebrow,.updates-hero .eyebrow{color:#dbd2ff}
.knowledge-totals{display:grid;grid-template-columns:auto auto;gap:5px 12px;align-items:baseline;min-width:220px}.knowledge-totals strong{font-size:1.75rem;color:#ffe071}.knowledge-totals span{font-size:.85rem;color:#eee9ff}
.source-library{background:#fff8e8;border:1px solid #ecd8ae;border-radius:18px;padding:22px 24px;margin-bottom:28px}.source-library>summary{cursor:pointer;display:flex;justify-content:space-between;gap:20px;align-items:center;list-style:none;color:#63431d}.source-library>summary::-webkit-details-marker{display:none}.source-library>summary strong{display:block;font-size:1.2rem}.source-library>summary small{display:block;margin-top:5px;color:#8b765c;font-weight:400}
.source-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px;margin-top:20px}.source-card{display:flex;flex-direction:column;min-height:190px;padding:18px;border:1px solid #e6d8bc;border-radius:13px;background:white}.source-card.selected{border:2px solid #da831c;background:#fff8e8}.source-code{font-size:.72rem;letter-spacing:1px;color:#a06018;font-weight:800}.source-card h3{margin:10px 0 8px;line-height:1.55}.source-card p{font-size:.8rem;color:var(--muted);margin-bottom:14px}.source-actions{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto}.source-actions a{font-size:.8rem;font-weight:750}.source-actions button{padding:5px;font-size:.78rem;min-height:32px;color:#744d20}
.knowledge-browser{margin-top:10px}.knowledge-browser .section-title{margin-top:0}.result-count{padding:7px 12px;border-radius:20px;background:#e9e4fa;color:#51369b;font-size:.82rem;font-weight:750;white-space:nowrap}
.knowledge-filter{display:grid;grid-template-columns:1.4fr repeat(3,1fr) auto auto;gap:12px;align-items:end;padding:18px;border:1px solid var(--line);border-radius:15px;background:white;margin-bottom:15px}.knowledge-filter .field{margin:0}.knowledge-filter label{font-size:.78rem}.knowledge-filter button{padding:10px 15px;white-space:nowrap}
.active-filter{padding:12px 16px;background:#fff1cf;border:1px solid #edc67a;border-radius:10px;margin-bottom:14px;color:#714514}.active-filter button{min-height:30px;padding:3px 7px;color:#714514}
.knowledge-list{display:flex;flex-direction:column;gap:12px}.knowledge-question{background:white;border:1px solid var(--line);border-radius:14px;overflow:hidden}.knowledge-question[open]{border-color:#b9a9e4;box-shadow:0 4px 18px #5a439010}.knowledge-question summary{list-style:none;cursor:pointer;padding:20px 22px}.knowledge-question summary::-webkit-details-marker{display:none}.knowledge-meta{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:11px}.knowledge-meta span{font-size:.72rem;padding:4px 7px;border-radius:5px;background:#eef2f1;color:#506564}.knowledge-meta .knowledge-number{background:#e7e0fb;color:#5735a0;font-weight:800}.knowledge-stem{font-weight:700;line-height:1.75;color:#243636}.expand-hint{display:block;margin-top:9px;color:#6545b0;font-size:.78rem;font-weight:700}.knowledge-answer{border-top:1px solid var(--line);padding:20px 22px;background:#fbfcfc}.knowledge-options{display:grid;gap:8px;margin-bottom:18px}.knowledge-options>div{display:flex;gap:10px;padding:10px 12px;border-radius:8px;background:white;border:1px solid var(--line);line-height:1.6}.knowledge-options>div>span{font-weight:800;color:#617473}.knowledge-options>div.is-answer{background:#e7f5eb;border-color:#74b68a;color:#185e37}.knowledge-answer blockquote{margin:15px 0;padding:14px 16px;border-left:4px solid #7752d6;background:#f0ecfb;line-height:1.75;color:#4e4269}.knowledge-answer .source{font-size:.82rem;color:var(--muted);margin-bottom:0}.pager{display:flex;justify-content:center;align-items:center;gap:18px;margin-top:22px}.pager span{font-size:.85rem;color:var(--muted)}
.updates-hero{background:linear-gradient(135deg,#c86818,#ef9e2d);box-shadow:0 7px 0 #95440a}.updates-hero .eyebrow,.updates-hero p{color:#fff5e6}.update-timeline{position:relative;padding-left:27px}.update-timeline:before{content:'';position:absolute;left:8px;top:10px;bottom:10px;width:3px;background:#d9cdec;border-radius:4px}.update-card{position:relative;padding:25px 27px;margin-bottom:16px;border:1px solid var(--line);border-radius:15px;background:white}.update-card.latest{border:2px solid #7654ce;background:#fbf9ff}.update-marker{position:absolute;left:-27px;top:31px;width:17px;height:17px;border:4px solid #f3f6f6;border-radius:50%;background:#8c78bf}.update-card.latest .update-marker{left:-28px;background:#ffaf35}.update-head{display:flex;justify-content:space-between;gap:20px}.update-head h2{margin:10px 0 8px}.update-head time{font-size:.82rem;color:var(--muted);white-space:nowrap}.version{font-weight:850;color:#5b3eaa}.latest-badge{margin-left:8px;padding:4px 8px;border-radius:10px;background:#ffdf9c;color:#6e4100;font-size:.7rem;font-weight:800}.update-card>p{color:var(--muted);margin-bottom:12px}.update-card ul{margin:0;padding-left:20px;line-height:1.9}
@media(max-width:1050px){.source-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.knowledge-filter{grid-template-columns:repeat(2,1fr)}.knowledge-search{grid-column:1/-1}}
@media(max-width:800px){.topbar{align-items:flex-start}.topnav{width:100%;overflow-x:auto;padding-bottom:3px}.topnav button{white-space:nowrap;font-size:.82rem;padding:7px}.username{display:none}.discovery-strip{grid-template-columns:1fr}.knowledge-hero{display:block;padding:28px 24px}.knowledge-totals{margin-top:20px}.source-grid{grid-template-columns:1fr}.source-library{padding:18px}.knowledge-filter{grid-template-columns:1fr}.knowledge-search{grid-column:auto}.knowledge-filter button{width:100%}.update-head{display:block}.update-head time{display:block;margin-top:4px}.knowledge-question summary,.knowledge-answer{padding:17px}.discovery-card{grid-template-columns:auto 1fr}.discovery-card b{display:none}}

.knowledge-hero.themed-banner,.updates-hero.themed-banner{position:relative;isolation:isolate;overflow:hidden;min-height:260px;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:34px 38px;border:1px solid #efdfcf;border-radius:22px;background:#fff7e8;color:#2d2036;box-shadow:none}
.themed-banner:before{content:'';position:absolute;inset:0 0 0 35%;z-index:-1;background-repeat:no-repeat;mask-image:linear-gradient(90deg,transparent 0%,#0004 22%,#000a 42%,#000 65%)}
.knowledge-banner:before{background-image:url('/assets/knowledge-banner.jpg');background-position:center 70%;background-size:108% auto}
.updates-banner:before{background-image:url('/assets/updates-banner.jpg');background-position:center 53%;background-size:108% auto}
.themed-banner>div:first-child{max-width:60%}.themed-banner h1{max-width:520px;color:#2d2036;text-shadow:0 2px 14px #fff7e8}.knowledge-hero.themed-banner p,.updates-hero.themed-banner p{max-width:540px;margin:0;color:#76563f;font-weight:500;text-shadow:0 1px 9px #fff7e8}.knowledge-hero.themed-banner .eyebrow,.updates-hero.themed-banner .eyebrow{color:#79532d}.themed-banner .banner-badge{align-self:flex-start;background:#fff9;border-color:#e9cda7;color:#79532d;backdrop-filter:blur(6px)}
@media(max-width:800px){.knowledge-hero.themed-banner,.updates-hero.themed-banner{min-height:245px;padding:25px 22px;align-items:center}.themed-banner:before{left:20%;mask-image:linear-gradient(90deg,transparent,#0004 30%,#000 85%)}.knowledge-banner:before{background-position:center 70%;background-size:112% auto}.updates-banner:before{background-position:center 53%;background-size:112% auto}.themed-banner>div:first-child{max-width:80%}.themed-banner h1{max-width:245px}.themed-banner p{max-width:250px}.themed-banner .banner-badge{display:none}}