@charset "UTF-8";
:root{--paper:#f5f7fa;--ink:#182b44;--muted:#66758a;--teal:#137d78;--teal-soft:#e8f3f1;--c:#335fa8;--c-soft:#edf2fa;--network:#b97027;--network-soft:#fbf2e6;--line:#dfe6ec;--white:#fff;--danger:#a83d3d;--danger-soft:#fbeeee;--radius:16px;--mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-size:15px;line-height:1.65;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;padding:0 0 calc(112px + env(safe-area-inset-bottom));min-width:280px}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.58}input,select,textarea{min-width:0;width:100%;border:1px solid #cbd6df;background:var(--white);border-radius:9px;padding:11px 13px;min-height:46px;outline-offset:3px}input[type=checkbox],input[type=radio]{width:20px;height:20px;min-height:20px;flex:0 0 20px;accent-color:var(--teal);margin:0}input[type=file]{padding:8px;max-width:100%;font-size:13px}input[type=file]::file-selector-button{min-height:36px;border:0;border-radius:5px;background:var(--teal-soft);color:var(--teal);padding:4px 12px;margin-right:10px;font:inherit}textarea{resize:vertical;min-height:88px}select{padding-right:30px}label{display:flex;flex-direction:column;gap:7px;font-weight:600;min-width:0}fieldset{border:0;padding:0;margin:0;min-width:0}fieldset>label,fieldset>.image-slot,fieldset>.form-grid{margin-bottom:20px}:focus-visible{outline:3px solid var(--teal);outline-offset:4px}main:focus{outline:none}h1,h2,h3,p{margin-top:0}h1{font-size:32px;line-height:1.35;letter-spacing:-.035em;margin-bottom:12px}h2{font-size:21px;line-height:1.5;margin-bottom:12px}h3{font-size:17px;line-height:1.55;margin-bottom:8px}p{margin-bottom:16px}small{font-size:12px}strong{font-weight:650}hr{border:0;border-top:1px solid var(--line);margin:24px 0}img{display:block;max-width:100%;height:auto}pre{max-width:100%;min-width:0;overflow-x:auto;overscroll-behavior-inline:contain;white-space:pre;background:#192c42;color:#e5edf6;border-radius:10px;padding:20px;font:14px/1.8 var(--mono);tab-size:4}code{font-family:var(--mono)}pre code{white-space:pre;overflow-wrap:normal;word-break:normal}form{min-width:0}svg{display:block}button{touch-action:manipulation}[hidden]{display:none!important}.page,.panel,.course-card,.practice-aside,.question-panel{min-width:0}.prose,.question-stem,.option-text,.bank-question h3{white-space:pre-wrap;overflow-wrap:anywhere}.muted{color:var(--muted)}.mono{font-family:var(--mono)}.full{width:100%}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-100px;left:16px;background:var(--ink);color:white;padding:14px;z-index:100}.skip-link:focus{top:12px}.site-header{max-width:1184px;margin:auto;padding:26px 32px 23px;display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;min-height:48px;flex-shrink:0;font-size:24px;font-weight:750;letter-spacing:.04em}.brand small{display:block;font-size:10px;font-weight:500;letter-spacing:.12em;color:var(--muted);line-height:1.5}.brand-mark{display:grid;place-items:center;width:44px;height:47px;background:var(--teal);border-radius:10px 10px 10px 2px;color:white;font-size:26px;box-shadow:4px 4px 0 #d5e8e5}.account-label{font-size:13px;color:var(--muted);text-align:right;overflow-wrap:anywhere;max-width:45%}#main{max-width:1184px;margin:auto;padding:42px 32px 0}.eyebrow{font-size:11px;font-weight:700;letter-spacing:.13em;color:var(--teal);margin-bottom:12px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:30px}.page-heading p{margin:0}.notebook-tab{align-self:flex-start;color:#8f9bad;border-left:1px solid #cbd6df;padding-left:18px;font-size:11px;letter-spacing:.2em;writing-mode:vertical-rl;line-height:1.5;white-space:nowrap}.panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:28px}.stack{display:flex;flex-direction:column;gap:18px}.stack p{margin-bottom:0}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:46px;max-width:100%;padding:10px 19px;border:1px solid var(--line);border-radius:9px;background:var(--white);font-weight:600;font-size:14px;line-height:1.6;text-align:center;transition:background .15s,border-color .15s;overflow-wrap:anywhere}.button:hover:not(:disabled){background:#edf3f6;border-color:#b6c6d1}.button.primary{background:var(--teal);border-color:var(--teal);color:var(--white)}.button.primary:hover:not(:disabled){background:#0e6561}.button.quiet{background:transparent;border-color:transparent}.button.small{font-size:13px;min-height:44px;padding:8px 12px}.button.danger{color:var(--danger)}.button.danger:hover:not(:disabled){background:var(--danger-soft);border-color:#ebcaca}.button-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;min-width:0}.icon-button{display:grid;place-items:center;background:transparent;border:1px solid var(--line);border-radius:8px;font-size:28px;line-height:1;width:44px;height:44px;flex:0 0 44px}.check-label{flex-direction:row;align-items:center;gap:10px;min-height:44px;font-size:14px;font-weight:500}.field-help{font-size:12px;color:var(--muted);font-weight:400;line-height:1.8;overflow-wrap:anywhere}.form-error{padding:12px 14px;border-left:3px solid var(--danger);background:var(--danger-soft);color:#8f2929;font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere;border-radius:3px}.hint{padding:16px 18px;background:var(--teal-soft);border-radius:10px;color:#315e5d;font-size:13px;overflow-wrap:anywhere}.hint.warning{background:var(--network-soft);color:#855119}.demo-banner,.demo-box{padding:12px 16px;border:1px solid #e9d7b5;border-radius:9px;color:#82531f;background:#fff8eb;font-size:13px}.tag{display:inline-flex;align-items:center;gap:5px;line-height:1.5;font-size:11px;letter-spacing:.02em;font-weight:600;padding:4px 9px;border-radius:5px;background:var(--teal-soft);color:var(--teal);overflow-wrap:anywhere}.tag.c,.c .tag{background:var(--c-soft);color:var(--c)}.tag.network,.network .tag{background:var(--network-soft);color:#93591f}.tag.demo{background:var(--network-soft);color:#895520}.tag.inactive{background:#eef0f3;color:#697382}.subject-tags{display:flex;gap:9px;margin-top:32px}.auth-layout{display:grid;grid-template-columns:1fr 430px;gap:84px;align-items:center;max-width:1040px;margin:14px auto 30px}.auth-intro{padding:12px 0}.auth-intro h1{font-size:48px;line-height:1.4;font-weight:650;letter-spacing:-.04em;margin:20px 0}.auth-intro>p{font-size:16px;color:var(--muted);line-height:1.9}.auth-card{padding:34px;box-shadow:0 12px 34px #182b4405}.auth-card h2{font-size:26px;margin-bottom:4px}.auth-card>p{font-size:13px}.auth-card form{margin-top:26px;gap:16px}.auth-help{border-top:1px solid var(--line);padding-top:20px;margin:24px 0 0;font-size:12px;color:var(--muted)}.demo-box{margin-top:20px}.demo-box p{margin:5px 0 12px}.notebook-motif{margin-top:32px;padding:22px 0 18px;border-top:1px solid #ccd8e1;border-bottom:1px solid #ccd8e1;position:relative;max-width:335px}.notebook-motif:before{content:"";position:absolute;top:0;bottom:0;left:15px;width:1px;background:#cadae7}.motif-label{position:relative;display:block;margin-left:32px;font:10px var(--mono);letter-spacing:.16em;color:var(--muted)}.notebook-motif>div{display:flex;align-items:center;gap:20px;margin:18px 0 14px 32px}.notebook-motif b{font-size:18px;font-weight:550}.notebook-motif i{font-style:normal;color:var(--teal)}.notebook-motif small{display:block;margin-left:32px;color:var(--muted)}.narrow{max-width:510px;margin:20px auto}.password-panel h1{font-size:27px}.password-panel>p{font-size:14px}.password-panel .quiet{margin-top:16px}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.course-card{padding:28px 30px;background:var(--white);border:1px solid var(--line);border-top:3px solid var(--c);border-radius:3px 3px 16px 16px}.course-card.network{border-top-color:var(--network)}.course-topline{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:28px}.course-symbol{font:26px var(--mono);letter-spacing:-.1em;color:var(--c);opacity:.65}.network .course-symbol{color:var(--network)}.course-card h2{font-family:"Songti SC",SimSun,serif;font-size:29px;font-weight:600;letter-spacing:.04em;margin-bottom:8px}.course-card>p{font-size:13px;margin-bottom:25px}.course-data{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:14px}.course-data strong{font-family:var(--mono);font-size:35px;font-weight:500;line-height:1.3}.course-data small{font-size:18px;color:#8a96a5}.course-data>span{font-size:12px;color:var(--muted)}.progress-track{height:5px;border-radius:8px;background:#eaf0f4;overflow:hidden}.progress-track>span{display:block;height:100%;background:var(--teal);border-radius:8px}.c .progress-track>span{background:var(--c)}.network .progress-track>span{background:var(--network)}.course-footer{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin-top:23px}.course-footer>span{font-size:12px;color:var(--muted)}.c .course-button{background:var(--c-soft);border-color:transparent;color:var(--c)}.network .course-button{background:var(--network-soft);border-color:transparent;color:#975919}.learning-footer{display:flex;gap:20px;max-width:650px;padding:32px 0;margin-top:12px}.line-icon{font-size:34px;line-height:1.3;color:#9db4c8}.learning-footer strong{font-size:14px}.learning-footer p{font-size:13px;color:var(--muted);margin:6px 0 0}.pending-banner{display:flex;gap:18px;align-items:center;justify-content:space-between;margin-bottom:24px}.pending-banner p{margin:5px 0 0}.pending-banner button{flex-shrink:0}.practice-heading{display:flex;align-items:center;gap:16px;margin-bottom:22px;font-size:13px;flex-wrap:wrap}.practice-heading>span{flex:1;color:var(--muted);overflow-wrap:anywhere}.practice-heading .button{padding-left:0}.practice-layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(0,1fr);gap:26px;align-items:start}.question-panel{padding:30px}.question-meta{display:flex;align-items:center;gap:10px;font-size:12px;flex-wrap:wrap;margin-bottom:18px}.question-stem{font-size:21px;line-height:1.8;letter-spacing:0;margin-bottom:22px}.answer-options{display:flex;flex-direction:column;gap:12px;margin-top:26px}.option-row{border:1px solid var(--line);border-radius:10px;background:var(--white);min-width:0;overflow-wrap:anywhere}.option-label{display:flex;flex-direction:row;align-items:center;gap:12px;padding:14px 16px;min-height:60px;font-weight:400;cursor:pointer}.option-label input{width:18px;height:18px;min-height:18px;flex-basis:18px}.option-key{font:600 15px var(--mono);color:var(--muted)}.option-text{flex:1;min-width:0;font-size:15px}.option-row.selected{border-color:var(--teal);background:#f1f8f7}.option-row.correct{border-color:var(--teal);background:var(--teal-soft)}.option-row.incorrect{border-color:#d68e8e;background:var(--danger-soft)}.option-status{font-size:11px;color:var(--teal);white-space:nowrap}.option-row>.image-thumb{margin:0 14px 14px;max-width:calc(100% - 28px)}.answer-actions{margin-top:24px}.answer-feedback:not(:empty){margin-top:18px}.image-thumb{display:block;width:fit-content;max-width:100%;padding:7px;border:1px solid var(--line);border-radius:8px;background:var(--white);min-height:44px;min-width:44px;text-align:left;margin:15px 0}.image-thumb img{max-height:230px;object-fit:contain;border-radius:4px}.image-thumb span{display:block;font-size:11px;color:var(--muted);margin:6px 3px 1px}.study-note{border-top:2px solid #aec6cf;padding:28px 18px;background:repeating-linear-gradient(transparent,transparent 31px,#dfe6ec66 31px,#dfe6ec66 32px);background-position:0 12px}.study-note h2{font-family:"Songti SC",SimSun,serif;font-size:25px;font-weight:500;line-height:1.8;margin-bottom:22px}.study-note p{font-size:13px;color:var(--muted);line-height:2}.explanation{border-top:3px solid var(--teal);font-size:14px}.explanation.is-wrong{border-top-color:var(--network)}.explanation .answer-line{font-size:15px}.answer-line strong{font:600 24px var(--mono);margin-left:8px}.explanation .muted{font-size:12px}.explanation h3{font-size:15px}.explanation:focus{outline:none}.completion{text-align:center;max-width:680px;margin:0 auto;padding:45px 30px}.completion strong{font:600 25px var(--mono);color:var(--teal)}.completion .button{margin-top:15px}.metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-bottom:26px}.metrics.three{grid-template-columns:repeat(3,minmax(0,1fr))}.metric{padding:25px 28px;background:var(--white);border:1px solid var(--line);border-radius:12px}.metric>span{font-size:12px;color:var(--muted);display:block;margin-bottom:7px}.metric strong{font:500 36px var(--mono);display:block}.metric small{font:12px -apple-system,BlinkMacSystemFont,"Microsoft YaHei",sans-serif;margin-left:10px;color:var(--muted)}.profile-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.profile-grid .panel h2{font-size:18px}.progress-item+.progress-item{border-top:1px solid var(--line);padding-top:22px;margin-top:22px}.progress-item .progress-track{margin:13px 0 8px}.progress-item .muted{font-size:12px}.spread{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;min-width:0}.spread>span{font-size:13px;color:var(--muted)}.chapter-row{display:flex;justify-content:space-between;gap:12px;font-size:12px;padding:7px 0;color:var(--muted)}.chapter-row>span:first-child{overflow-wrap:anywhere}.chapter-row .mono{flex-shrink:0}.recent-list{list-style:none;padding:0;margin:0}.recent-list li{display:flex;gap:12px;padding:15px 0;border-bottom:1px solid var(--line)}.recent-list li:last-child{border:0}.recent-list li>div{min-width:0}.recent-list p{font-size:14px;margin:0 0 5px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere}.result-dot{width:7px;height:7px;border-radius:50%;background:var(--teal);flex:0 0 7px;margin-top:9px}.result-dot.bad{background:var(--network)}.account-panel{display:flex;align-items:center;justify-content:space-between;gap:25px;margin-top:25px}.account-panel h2{font-size:18px}.account-panel>div:first-child{flex:1;min-width:0}.account-panel p{font-size:13px;margin:6px 0 0;overflow-wrap:anywhere}.account-panel .button-row{flex-shrink:0}.filter-bar{margin-bottom:20px}.filter-bar label{max-width:270px;font-size:13px}.rank-rule{display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:13px;margin:20px 0}.rank-rule p{margin:0;flex:1;color:var(--muted);white-space:pre-wrap}.rank-rule strong{color:var(--teal)}.ranking-list{padding:8px 24px}.rank-row{display:grid;grid-template-columns:55px minmax(0,1fr) 150px 90px;gap:14px;align-items:center;padding:20px 8px;border-bottom:1px solid var(--line);font-size:14px;min-width:0}.rank-row:last-child{border:0}.rank-row>span{overflow-wrap:anywhere}.rank-row>:nth-child(3),.rank-row>:last-child{text-align:right}.rank-row .tag{margin-left:9px}.rank-labels{font-size:11px;color:var(--muted);padding-top:16px;padding-bottom:15px}.rank-number{font:500 22px var(--mono);color:#8c9aab}.rank-row.is-me{background:var(--teal-soft);border-radius:8px}.is-me .rank-number{color:var(--teal)}.toolbar{display:flex;align-items:end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:20px}.toolbar>label{font-size:12px;min-width:170px}.toolbar>.button-row{flex:1;justify-content:flex-end}.toolbar .search-label{max-width:310px;min-width:200px;flex:1}.toolbar input{background:var(--white)}.student-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.student-card{padding:22px}.student-identity{display:flex;gap:12px;align-items:center;margin-bottom:20px}.student-identity>div{min-width:0;flex:1;overflow-wrap:anywhere}.student-identity h3{margin:0}.student-identity p{font-size:12px;margin:2px 0 0}.avatar{width:40px;height:40px;display:grid;place-items:center;background:var(--c-soft);color:var(--c);border-radius:10px;flex:0 0 40px;font-weight:600}.student-details{display:flex;flex-direction:column;gap:7px;font-size:12px;margin-bottom:18px;overflow-wrap:anywhere}.student-details>span:first-child{font-size:14px}.student-card>.button-row{border-top:1px solid var(--line);padding-top:15px;gap:7px}.big-number{font:500 35px var(--mono);margin-right:8px}.course-summary h2{font-size:25px;margin-top:20px;font-family:"Songti SC",SimSun,serif}.course-summary p{font-size:12px;color:var(--muted)}.course-summary .button{margin-top:5px}.question-bank{display:flex;flex-direction:column;gap:18px}.bank-question h3{font-weight:500;line-height:1.8;font-size:17px}.bank-question .question-meta{margin-bottom:0}.bank-question>.spread{margin-bottom:18px}.bank-question>.muted{font-size:12px;margin:18px 0}.bank-question pre{max-height:180px;overflow-y:auto}.bank-question .image-thumb img{max-height:130px}.modal{border:1px solid var(--line);border-radius:16px;padding:26px;width:min(720px,calc(100% - 32px));max-height:calc(100dvh - 48px);color:var(--ink);background:var(--white);overscroll-behavior:contain;box-shadow:0 25px 100px #182b4426;overflow-y:auto;overflow-x:hidden}.modal::backdrop,.image-dialog::backdrop{background:#14283ed6;backdrop-filter:blur(3px)}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:24px}.dialog-heading h2{font-size:21px;margin:0}.dialog-heading>span{font-size:14px}.modal [data-modal-body]{min-width:0}.modal .hint{margin-bottom:6px}.image-dialog{border:0;border-radius:12px;padding:20px;width:min(1000px,calc(100% - 24px));max-height:calc(100dvh - 24px);background:#fff;color:var(--ink);overflow:auto}.image-dialog>img{margin:0 auto;max-height:calc(100dvh - 180px);object-fit:contain}.image-dialog>p{font-size:12px;color:var(--muted);text-align:center;margin:15px 0 0}.image-dialog .dialog-heading{margin-bottom:15px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.question-editor fieldset{display:block}.question-editor fieldset>label{font-size:13px}.code-input{font-family:var(--mono);font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere;background:#f5f7fa}.image-slot{padding:14px;border:1px dashed #c9d5df;border-radius:9px;min-width:0;background:#fafbfd}.image-slot label{font-size:12px}.image-slot>.field-help{display:block;margin-top:5px}.upload-preview .image-thumb{margin-bottom:4px}.upload-preview img{max-height:160px}.editor-section-heading{margin:26px 0 16px}.editor-section-heading h3{margin:0}.editor-section-heading p{margin-top:4px}.option-editor{border:1px solid var(--line);border-radius:10px;padding:17px;margin-bottom:14px}.option-editor>.spread{margin-bottom:12px}.option-editor>label{font-size:12px;margin-bottom:15px}.question-editor [data-options]+.button-row{margin-bottom:24px}.credential-list{display:flex;flex-direction:column;gap:9px;margin:20px 0}.credential{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;background:var(--paper);padding:15px;border-radius:8px}.credential>div{display:flex;flex-direction:column;font-size:13px;min-width:0;overflow-wrap:anywhere}.credential code{white-space:pre-wrap;overflow-wrap:anywhere;user-select:all;font-size:16px;color:var(--teal)}.preview-list{padding:12px 14px 12px 30px;background:var(--paper);border-radius:8px;font-size:12px;overflow-wrap:anywhere}.preview-list li{padding:4px}.empty{text-align:center;padding:42px 20px;color:var(--muted);grid-column:1/-1}.empty-mark{display:inline-grid;place-items:center;width:56px;height:56px;font:32px var(--mono);background:#eaf0f4;border-radius:50%;color:#8c9eaf;margin-bottom:18px}.empty h3{color:var(--ink);font-size:17px}.empty p{font-size:13px;max-width:380px;margin:0 auto}.loading{display:flex;gap:12px;align-items:center;justify-content:center;color:var(--muted);font-size:14px;min-height:240px}.spinner{width:20px;height:20px;border:2px solid var(--line);border-top-color:var(--teal);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error-state{padding:40px 24px;border:1px solid #efd6d6;border-radius:14px;background:var(--white);text-align:center}.error-state p{color:var(--muted);overflow-wrap:anywhere}.offline{padding:10px 20px;background:#fff1db;color:#845118;text-align:center;font-size:12px}.toast{position:fixed;left:50%;bottom:calc(104px + env(safe-area-inset-bottom));transform:translate(-50%,12px);max-width:min(560px,calc(100% - 32px));width:max-content;background:var(--ink);color:white;border-radius:10px;padding:13px 19px;font-size:13px;box-shadow:0 5px 25px #182b441a;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;z-index:20;overflow-wrap:anywhere}.toast.visible{opacity:1;transform:translate(-50%,0)}.bottom-nav{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);display:grid;grid-template-columns:repeat(4,minmax(0,1fr));width:560px;max-width:calc(100% - 32px);padding:8px;background:var(--white);border:1px solid var(--line);border-radius:16px;box-shadow:0 4px 24px #182b4409;z-index:10}.bottom-nav a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;min-height:51px;font-size:11px;color:var(--muted);border-radius:9px}.bottom-nav a>span{font-size:20px;font-family:var(--mono);line-height:1.2}.bottom-nav a[aria-current=page]{color:var(--teal);background:var(--teal-soft);font-weight:650}
@media(min-width:1280px){.auth-layout{margin-top:45px}.auth-card{padding:38px}.course-card{padding:30px 34px}.site-header{padding-top:30px}}
@media(max-width:1000px){.auth-layout{gap:40px;grid-template-columns:minmax(0,1fr) 390px}.auth-intro h1{font-size:39px}.student-list{grid-template-columns:repeat(2,minmax(0,1fr))}.practice-layout{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:18px}.question-panel,.explanation{padding:22px}.account-panel{align-items:start;flex-direction:column}.rank-row{grid-template-columns:45px minmax(0,1fr) 120px 80px}.course-card{padding:25px}.account-panel .button-row{flex-shrink:1}}
@media(max-width:760px){.site-header{padding:20px 24px}#main{padding:30px 24px 0}.auth-layout{display:block;max-width:470px;margin:0 auto}.auth-intro{padding:0;margin-bottom:26px}.auth-intro h1{font-size:33px;margin:10px 0}.auth-intro h1 br{display:none}.auth-intro>p,.notebook-motif,.auth-intro .subject-tags{display:none}.auth-intro .eyebrow{margin-bottom:7px}.auth-card{padding:28px}.course-grid{gap:18px}.course-card{padding:22px}.course-card h2{font-size:25px}.course-data>span{font-size:11px}.course-data strong{font-size:30px}.course-footer{gap:12px}.course-footer .button{width:100%}.course-topline{margin-bottom:22px}.course-symbol{font-size:22px}.practice-layout{display:block}.practice-aside{margin-top:22px}.study-note{display:none}.question-panel{padding:26px}.profile-grid{grid-template-columns:1fr}.metrics.three{gap:12px}.metric{padding:19px}.metric strong{font-size:30px}.toolbar{align-items:stretch}.toolbar>.button-row{justify-content:flex-start}.page-heading h1{font-size:28px}.rank-rule{align-items:start;flex-direction:column;gap:12px}.panel{padding:24px}.ranking-list{padding:8px 16px}.account-panel{gap:20px}.student-card{padding:20px}.bank-question pre{font-size:12px}}
@media(max-width:540px){input,select,textarea{font-size:16px}body{padding-top:env(safe-area-inset-top);padding-bottom:calc(96px + env(safe-area-inset-bottom))}.site-header{padding:16px 20px;gap:14px}.brand{font-size:22px;gap:10px}.brand-mark{width:38px;height:42px;font-size:24px}.brand small{font-size:9px;letter-spacing:.04em}.account-label{font-size:11px;max-width:36%}#main{padding:27px 20px 0}h1{font-size:27px}.page-heading{gap:12px;margin-bottom:25px}.page-heading h1{font-size:26px}.page-heading p{font-size:13px}.eyebrow{font-size:10px}.notebook-tab{font-size:9px;padding-left:12px}.course-grid{grid-template-columns:1fr;gap:20px}.course-card{padding:24px}.course-topline{margin-bottom:18px}.course-card h2{font-size:28px}.course-card>p{margin-bottom:23px}.course-data strong{font-size:34px}.course-footer .button{width:auto}.course-footer{gap:12px}.learning-footer{padding:20px 0;margin-top:15px;gap:14px}.course-symbol{font-size:25px}.bottom-nav{bottom:0;width:100%;max-width:none;padding:7px max(12px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(12px,env(safe-area-inset-left));border:0;border-top:1px solid var(--line);border-radius:0;box-shadow:0 -2px 16px #182b4405}.bottom-nav a{min-height:51px;gap:3px;font-size:11px}.bottom-nav a>span{font-size:21px}.toast{bottom:calc(83px + env(safe-area-inset-bottom))}.auth-card{padding:25px 23px}.auth-card h2{font-size:24px}.auth-intro h1{font-size:29px;line-height:1.6;letter-spacing:-.05em}.auth-intro{margin-bottom:22px}.auth-layout{margin-top:0}.auth-card form{margin-top:22px}.subject-tags{margin-top:20px}.panel{padding:22px}.pending-banner{align-items:stretch;flex-direction:column;gap:12px}.pending-banner .button{align-self:flex-start}.question-panel{padding:20px}.practice-heading{gap:8px;margin-bottom:16px}.practice-heading>span{font-size:11px}.practice-heading .button{font-size:12px;min-height:44px;padding-right:8px}.practice-heading>b{font-size:11px}.question-stem{font-size:19px}.question-meta{font-size:11px;gap:8px;margin-bottom:14px}.option-label{padding:13px 12px;gap:9px}.option-text{font-size:14px}.option-status{font-size:10px}.option-label input{width:16px;height:16px;min-height:16px;flex-basis:16px}.option-row>.image-thumb{margin-left:12px;margin-right:12px;max-width:calc(100% - 24px)}pre{font-size:12px;padding:15px}.metrics{gap:12px;margin-bottom:20px}.metric{padding:18px}.metric strong{font-size:32px}.metrics.three{gap:9px}.metrics.three .metric{padding:14px 10px}.metrics.three .metric strong{font-size:25px}.metrics.three .metric>span{font-size:10px}.metrics.three .metric small{font-size:10px;margin-left:3px}.student-list{grid-template-columns:1fr;gap:16px}.student-card{padding:21px}.toolbar{gap:13px}.toolbar>.button-row{flex-basis:100%;gap:8px}.toolbar .search-label{max-width:none;flex-basis:100%}.toolbar .button{font-size:12px;padding:9px 12px;min-height:44px}.toolbar>label{flex:1;min-width:0}.ranking-list{padding:4px 10px}.rank-row{grid-template-columns:29px minmax(0,1fr) 86px 55px;gap:7px;padding:17px 4px;font-size:12px}.rank-labels{font-size:9px}.rank-number{font-size:19px}.rank-row .tag{margin-left:4px;padding:1px 4px;font-size:9px}.rank-rule{font-size:12px}.modal{width:calc(100% - 20px);padding:20px;max-height:calc(100dvh - 24px);border-radius:13px}.dialog-heading{margin-bottom:20px}.dialog-heading h2{font-size:19px}.image-dialog{padding:14px}.form-grid{gap:12px}.option-editor{padding:13px}.image-slot{padding:11px}.account-panel .button-row{width:100%}.account-panel .button-row .button{flex:1}.account-panel>button{width:100%}.password-panel h1{font-size:24px}.profile-grid{gap:20px}.recent-list li{padding:13px 0}.bank-question>.spread{gap:8px}.bank-question h3{font-size:15px}.bank-question .question-meta{font-size:11px}.credential code{font-size:14px}.error-state{padding:28px 18px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition:none!important;scroll-behavior:auto!important}}