@charset "UTF-8";
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@media(min-width:1500px){.account-wrap{padding-top:45px}.page-heading{margin-bottom:31px}.mode-card{padding:25px}.practice-panel{padding:32px}.practice-body{gap:60px}}
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@media(max-width:760px){.app-sidebar{position:static;width:100%;padding:17px 18px 0;border:0;background:#fff}.app-brand{font-size:22px;padding:0;gap:9px}.brand-mark{width:34px;height:36px;border-radius:9px;font-size:27px}.app-brand small{font-size:8px}.nav-label,.sidebar-foot,.nav-divider{display:none}.app-workspace{margin-left:0}.app-topbar{height:53px;padding:0 20px;border-top:1px solid #edf1e7}.breadcrumb{font-size:10px;white-space:nowrap}.breadcrumb span{margin:0 8px}.user-pill{font-size:10px;gap:5px}.avatar{width:23px;height:23px;font-size:10px}#menu{flex-direction:row;gap:5px;overflow-x:auto;padding:17px 0 13px;scrollbar-width:thin}.nav-item{min-height:36px;flex:none;gap:5px;border-radius:6px;padding:9px 10px;font-size:11px}.nav-item svg{width:15px;height:15px}.nav-item i{display:none}.nav-item.logout{margin:0}.account-wrap{padding:27px 19px 20px;min-height:calc(100dvh - 230px)}h1{font-size:24px;letter-spacing:-.5px}.eyebrow{font-size:8px;margin-bottom:8px}.subtitle{font-size:11px;margin-top:8px}.page-heading{margin-bottom:22px}.mode-switch{gap:9px;margin-bottom:21px}.mode-card{padding:16px 12px;gap:9px;align-items:flex-start;border-radius:9px}.mode-card>svg{width:19px;height:21px;margin-top:1px}.mode-card b{font-size:13px}.mode-card small{font-size:9px;line-height:1.8;margin-top:5px}.mode-arrow{display:none}.card{padding:21px}.section-top h2{font-size:15px}.section-top .account-note{font-size:10px}.tag{font-size:9px;padding:5px 7px}.subject-tabs{gap:4px}.subject-tab{font-size:11px;min-height:35px;padding:8px 12px}.practice-panel>.subject-tabs{margin-top:20px;padding-bottom:17px}.practice-body{padding-top:22px;gap:25px}.practice-form{grid-template-columns:1fr;gap:17px}.practice-form>.button{width:100%;justify-self:stretch;margin-top:3px}.study-aside h3{font-size:15px}.study-aside p{font-size:11px}.study-steps{gap:7px}.study-steps span{font-size:10px}.study-steps b{margin-right:5px}.quiet-banner{font-size:10px;align-items:flex-start}.quiet-banner .text-button{font-size:10px;padding:0;min-height:auto}.library-main>.section-top{padding:21px 18px 17px}.paper-tabbar{padding:0 18px;gap:24px}.paper-filters{padding:19px 18px}.paper-filters .subject-tab{font-size:10px;padding:8px 10px}.filter-selects{gap:13px;flex-wrap:nowrap}.filter-selects label{flex:1;gap:8px;font-size:10px}.filter-selects select{width:100%;font-size:10px}.results-heading{padding:18px 18px 3px}.paper-list{padding:0 18px}.paper-item{display:grid;grid-template-columns:35px minmax(0,1fr);gap:11px;padding:18px 0}.paper-icon{width:35px;height:46px;align-self:start}.paper-info h3{font-size:12px}.paper-info p{font-size:9px}.paper-item>.button{grid-column:2;justify-self:start;min-height:35px;font-size:10px;margin-top:1px}.paper-tags span{font-size:8px}.library-aside{grid-template-columns:1fr;gap:18px}.aside-block h3{font-size:17px}.aside-block{padding:22px}.aside-number{margin-top:15px}.aside-number b{font-size:29px}.library-aside .aside-recent{padding:0 3px}.source-note{font-size:10px}.app-footer{padding:15px 19px 24px;font-size:9px}.app-footer>span:last-child{font-size:8px}.question-panel{padding:23px 18px}.question-head{font-size:10px}.question-panel h2.question-stem{font-size:17px;line-height:1.9}.question-form .answer-option{font-size:12px;min-height:57px;gap:10px;padding:12px}.question-form>.button{justify-self:stretch}.session-card .account-actions{flex-direction:column;align-items:flex-start}.solution-block .button{font-size:11px;text-align:left}.auth-layout{margin:14px auto}.auth-card{padding:26px 23px}.is-auth .app-sidebar{padding-bottom:18px}.is-auth #menu{display:none}.account-table{font-size:10px}.account-table td,.account-table th{padding:10px 5px}.account-error{font-size:12px;padding:12px}.admin-detail .button{font-size:10px;padding:9px 12px}.admin-item summary{font-size:11px}.account-row{padding:18px;font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;scroll-behavior:auto!important}}
@media(max-width:1000px){.study-aside{border-left:0;border-top:1px solid #e8ebe3;padding:22px 0 0}}
@media(max-width:760px){.filter-selects label{white-space:nowrap;min-width:0}.filter-selects select{min-width:0}.library-main>.section-top{padding-left:4px;padding-right:4px}.results-heading{padding-left:4px;padding-right:4px}.paper-list{padding:0 4px}}
.review-hint{color:#9a6541!important;background:#fff8ef;border-left:3px solid #dfb27c;padding:6px 8px}
@media(max-width:760px){.real-practice-panel{padding:21px}.real-practice-list{grid-template-columns:1fr}.real-filters{display:grid;grid-template-columns:1fr;gap:12px}.real-filters label{display:grid;gap:7px}.real-filters select{width:100%}}
.practice-mode-tabs{display:flex;gap:16px;border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:22px}.practice-mode-tabs button{padding:8px;background:transparent;color:var(--muted);border-bottom:2px solid transparent}.practice-mode-tabs button.active{color:var(--green);border-color:var(--green);font-weight:650}.real-practice-panel{padding:27px}.real-practice-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.real-practice-item{padding:18px 0;border-bottom:1px solid var(--line);min-width:0}.real-practice-item h3{line-height:1.8;font-size:14px;margin:12px 0}.real-practice-item p{font-size:11px;line-height:1.8;margin-bottom:12px;color:var(--muted)}.real-filters{display:flex;gap:20px;margin:22px 0}.real-filters label{display:grid;gap:8px;font-size:12px;min-width:0}.real-filters select{max-width:100%;padding:10px}.concept-card{background:#eef4e8;padding:16px;border-radius:10px;margin:20px 0;font-size:13px;line-height:1.9}.concept-card small{color:var(--muted)}.rich-question{font-family:"Cambria Math","Microsoft YaHei",sans-serif;line-height:2.1;font-size:17px;overflow-wrap:anywhere;min-width:0}.rich-question p{margin:10px 0;white-space:pre-wrap}.rich-question img{max-width:100%;height:auto;vertical-align:middle;object-fit:contain}.rich-question p>img{max-height:420px}.rich-question math{font-family:"Cambria Math",serif;vertical-align:middle;max-width:100%;overflow-x:auto}.table-scroll{max-width:100%;overflow-x:auto}.rich-question table{border-collapse:collapse;max-width:100%;font-size:14px}.rich-question td{padding:6px;border:1px solid var(--line)}.rich-question td p{margin:0}.real-result{padding:20px;margin:20px 0;border:1px solid var(--line);background:#fafbf8;border-radius:10px;line-height:2;white-space:pre-wrap}.real-result.correct{background:#eff7ed}.real-result .rich-question{font-size:15px}.real-question-panel .source-line{overflow-wrap:anywhere;line-height:1.8}.reader-controls{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.paper-reader figure{margin:18px 0}.paper-reader img{display:block;width:100%;height:auto;background:#fff;border:1px solid var(--line)}.paper-reader figcaption{text-align:center;font-size:12px;color:var(--muted);padding:8px}.paper-transcript{white-space:pre-wrap;line-height:2;font-size:16px;margin-top:20px;overflow-wrap:anywhere}.paper-text summary,.paper-notes summary{cursor:pointer;padding:15px 0;font-size:13px}.paper-notes textarea{width:100%;min-height:180px;padding:14px;border:1px solid var(--line);border-radius:8px}.session-card{max-width:100%;min-width:0}.real-practice-panel .source-note{margin-top:20px}.asset-missing{color:#a36137}.real-practice-item .review-hint{font-size:11px}.real-practice-panel .pagination{margin-top:20px}.reader-controls .button{font-size:12px}#reader-status{line-height:1.8;overflow-wrap:anywhere}.real-practice-panel .results-heading{padding:12px 0}
@media(max-width:760px){.real-practice-list{grid-template-columns:1fr}.real-practice-panel{padding:20px}.real-filters{display:grid;grid-template-columns:1fr 1fr;gap:12px}.rich-question{font-size:15px}.rich-question td{font-size:12px}.reader-controls .button{font-size:11px;padding:8px 10px}.paper-transcript{font-size:14px}}


.practice-mode-tabs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;height:54px;margin:0 0 22px;padding:0;border-bottom:1px solid var(--line)}
.practice-mode-tabs button{position:relative;display:flex;align-items:center;justify-content:center;min-width:0;height:54px;padding:0 8px;border:0;border-bottom:2px solid transparent;background:transparent;color:var(--muted);font-size:14px;line-height:1.2;white-space:nowrap}
.practice-mode-tabs button.active{border-color:var(--green);color:var(--green);font-weight:650}
.real-practice-panel{padding:24px}
.reader-zoom{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:16px 0;font-size:12px}.reader-zoom small{color:var(--muted)}.reader-zoom .button{min-height:35px;padding:7px 12px}.paper-reader{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain}.paper-reader figure{width:var(--paper-zoom,100%)}.rich-question math{margin:0 .2em}.rich-question p>img{margin:0 .15em}

.true-practice-start .real-filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:28px 0}.true-practice-start select{width:100%}.practice-start-button{display:flex;align-items:center;justify-content:center;gap:24px;width:100%;min-height:88px;font-size:24px;font-weight:650;border-radius:12px;margin:12px 0}.practice-start-button:disabled{opacity:.45;cursor:not-allowed}.practice-start-note{text-align:center;margin:14px 0 26px}@media(max-width:760px){.true-practice-start .real-filters{grid-template-columns:1fr;gap:14px}.practice-start-button{min-height:76px;font-size:22px}}

.true-practice-start .real-filters{grid-template-columns:minmax(0,280px)}
.practice-overview{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;margin:24px 0 8px;border:1px solid var(--line);background:var(--line);border-radius:10px;overflow:hidden}.practice-overview>div{display:grid;gap:6px;padding:16px;background:#fbfcf8}.practice-overview b{font-size:22px;color:var(--green)}.practice-overview span{font-size:11px;color:var(--muted)}@media(max-width:760px){.practice-overview{grid-template-columns:repeat(2,minmax(0,1fr));margin-top:20px}.practice-overview>div{padding:13px}.practice-overview b{font-size:19px}}
/* QQuiz-inspired visual system: neutral workspace, white surfaces, blue action color */
:root{--green:#2857a4;--green-dark:#173c7a;--ink:#111827;--muted:#667085;--line:#e3e8f0;--paper:#fff;--wash:#f5f7fb;--accent-soft:#eaf1ff;--shadow:0 16px 40px rgba(31,45,71,.08)}
body{background:var(--wash);color:var(--ink)}
.app-sidebar{background:#fff;border-right:1px solid var(--line);padding:28px 22px 20px}.app-brand{color:var(--ink);font-size:25px}.brand-mark{background:var(--green);border-radius:10px}.nav-label{color:#98a2b3;font-size:10px;letter-spacing:.08em;text-transform:uppercase}.nav-item{color:#526070;border-radius:12px;margin:4px 0;padding:12px 14px}.nav-item:hover{background:#f2f5fa;color:var(--green)}.nav-item.active{background:var(--green);color:#fff;box-shadow:0 8px 18px rgba(40,87,164,.2)}.nav-item i{background:#fff}.app-topbar{background:#fff;border-bottom:1px solid var(--line)}.breadcrumb{color:#98a2b3}.breadcrumb b{color:#344054}.user-pill{background:#f7f9fc;border:1px solid var(--line);padding:6px 10px;border-radius:999px}.avatar{background:var(--accent-soft);color:var(--green)}
.account-wrap{background:var(--wash);padding:42px 40px 30px}.page-heading{max-width:1180px;margin:0 auto 28px}.eyebrow{color:var(--green);letter-spacing:.14em}.page-heading h1{font-size:38px;letter-spacing:-.02em}.subtitle{color:var(--muted)}.card,.real-practice-panel,.library-main,.library-aside,.question-panel{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:22px}.section-top{border-bottom:1px solid #eef1f5;padding-bottom:20px}.section-top h2{font-size:21px}.tag,.paper-tags span{background:var(--accent-soft);color:var(--green);border:0;border-radius:999px}.subject-tabs{gap:8px}.subject-tab{border:1px solid var(--line);background:#fff;color:#526070;border-radius:10px}.subject-tab.active{background:var(--green);border-color:var(--green);color:#fff}.button{background:var(--green);border-color:var(--green);border-radius:10px;box-shadow:0 6px 14px rgba(40,87,164,.16)}.button:hover{background:var(--green-dark);border-color:var(--green-dark)}.button.secondary{background:#fff;color:var(--green);border:1px solid #b9c9e6;box-shadow:none}.practice-overview{border-color:var(--line);background:var(--line);border-radius:14px}.practice-overview>div{background:#fff}.practice-overview b{color:var(--green)}.practice-start-button{min-height:92px;border-radius:14px;font-size:25px}.real-practice-panel{max-width:1180px;margin:0 auto;padding:30px}.source-note{color:#98a2b3}.input,.account-form input,.account-form select,.account-form textarea,select{border-color:#d7dee9;background:#fff;border-radius:9px}.empty-state{border:1px dashed #cbd5e1;background:#fbfcfe;color:#98a2b3;border-radius:14px}.paper-item,.result-item{border-color:#edf0f5}.app-footer{background:var(--wash);color:#98a2b3}
@media(max-width:760px){.app-sidebar{padding:16px 18px 0}.account-wrap{padding:25px 18px}.page-heading h1{font-size:28px}.real-practice-panel{padding:21px;border-radius:16px}.card,.question-panel{border-radius:16px}.practice-start-button{font-size:21px;min-height:78px}.nav-item.active{box-shadow:none}}
.account-row label{display:grid;gap:8px;margin:14px 0 12px;max-width:360px}.account-row label select{display:block;width:100%;min-width:0}.account-row>.button{display:inline-flex;margin-top:4px;position:relative;z-index:1}.account-row{overflow:hidden}@media(max-width:760px){.account-row label{max-width:none}.account-row>.button{width:auto;min-width:96px}}
 .admin-photo-settings{margin:20px 0}.admin-photo-settings h3,.admin-photo-history h3{font-size:17px}.admin-photo-settings label{display:grid;gap:8px;max-width:480px;margin:18px 0}.admin-photo-settings input{min-height:42px;padding:10px 12px;border:1px solid var(--line);border-radius:8px}.admin-photo-history{margin-top:28px}.admin-photo-history .account-row p{overflow-wrap:anywhere}

/* Touch screens, notches and narrow WeChat browser windows. */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body{padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}
@media(max-width:760px){.app-sidebar{padding-top:max(16px,env(safe-area-inset-top))}.app-workspace{min-width:0}.account-wrap{padding-bottom:calc(25px + env(safe-area-inset-bottom))}input,textarea,select,.account-form input,.account-form textarea,.account-form select,.question-search-bar input{font-size:16px}.nav-item,.button,.subject-tab{min-height:44px}.rich-question{max-width:100%;overflow-x:auto;overflow-wrap:anywhere}.rich-question img{max-width:100%;height:auto}.rich-question table{display:block;max-width:100%;overflow-x:auto}.mode-card{min-width:0;padding:16px 12px}.app-footer{padding-bottom:calc(20px + env(safe-area-inset-bottom))}}

@media(pointer:coarse){input,textarea,select,.account-form input,.account-form textarea,.account-form select,.question-search-bar input{font-size:16px}}