.bonus-dialog{overscroll-behavior:contain;border:1px solid var(--line);width:min(520px,100vw - 32px);max-height:calc(100dvh - 32px);color:var(--ink);background:#fbfbf6;border-radius:14px;padding:28px;overflow:auto;box-shadow:0 20px 80px #252c4038}.bonus-dialog::backdrop{background:#252c4073}.bonus-header{justify-content:space-between;align-items:start;gap:16px;display:flex}.bonus-header h2{margin:12px 0 20px;font-size:26px}.bonus-header .eyebrow{font-size:9px;line-height:1.6}.bonus-close{color:var(--muted);background:0 0;flex-shrink:0;width:44px;height:44px;font-size:26px}.bonus-prompt{font-size:16px;font-weight:550;line-height:1.5}.bonus-code{background:#f0f2e9;border-radius:7px;margin:16px 0;padding:14px 16px}.bonus-code .code-label{margin-bottom:8px;display:block}.bonus-code pre{font-size:13px}.bonus-options{gap:8px;display:grid}.bonus-options button{text-align:left;min-height:44px;color:var(--ink);background:#f8f9f2;border:1px solid #dcdfd4;border-radius:7px;padding:12px 14px;font-size:13px;line-height:1.6}.bonus-options button:hover:not(:disabled){background:#eff1e8;border-color:#a9b499}.bonus-options button:disabled{opacity:1}.bonus-options button.correct{background:#eaf0e6;border-color:#7f9875}.bonus-options button.incorrect{background:#f5eae3;border-color:#bf8970}.bonus-feedback{margin-top:18px;font-size:13px;line-height:1.6}.bonus-feedback.success strong{color:var(--green)}.bonus-feedback.miss strong{color:#97583d}.bonus-feedback p{margin:8px 0 0}.bonus-feedback details{margin-top:12px}.bonus-actions{flex-wrap:wrap;justify-content:flex-end;gap:10px;margin-top:22px;display:flex}.bonus-actions button{min-height:44px}.bonus-note{color:var(--muted);margin:16px 0 0;font-size:11px}@media (width<=480px){.bonus-dialog{padding:20px}.bonus-header h2{font-size:23px}.bonus-dialog .eyebrow{letter-spacing:1px;font-size:8px}.bonus-code pre{font-size:12px}}.learning-content{margin-top:16px}.learning-content h3{letter-spacing:0;margin:18px 0 7px;font-size:13px;font-weight:650}.learning-content p,.learning-error-help p{font-size:12px;line-height:1.8}.learning-flow{gap:10px;margin:10px 0 18px;padding-left:24px;font-size:12px;line-height:1.8;display:grid}.learning-flow li{padding-left:4px}.learning-flow li::marker{color:var(--accent);font-weight:650}.learning-example{background:#f5f7ee;border:1px solid #d6dccf;border-radius:7px;padding:12px 14px}.learning-example summary{cursor:pointer;font-weight:550}.learning-example pre{background:#edf0e6;border-radius:5px;margin-top:14px;padding:12px;font-size:12px;line-height:1.8}.learning-content .learning-outcome{margin:12px 0 0}.learning-content .learning-remember{margin:16px 0 0}.learning-error-help{background:#f2eee3;border-left:3px solid #b79066;border-radius:4px;margin-top:14px;padding:12px 14px;font-size:12px}.learning-error-help p{margin:6px 0 0}.retry-example .learning-support{margin-top:15px}@media (width<=480px){.learning-example{padding:10px}.learning-example pre{padding:10px;font-size:11px}}.progress-backup{border-top:1px solid var(--line);padding-top:24px;padding-bottom:12px}.backup-heading{justify-content:space-between;align-items:center;gap:24px;display:flex}.backup-heading h2{margin:9px 0;font-size:20px}.backup-heading p,.backup-note,.backup-message,.backup-error{font-size:12px;line-height:1.7}.backup-heading p,.backup-note{color:var(--muted)}.backup-buttons{flex-wrap:wrap;gap:10px;display:flex}.backup-buttons button{min-height:44px}.backup-message{color:#47643c}.backup-error{color:#995536}.backup-dialog{border:1px solid var(--line);width:min(500px,100vw - 32px);max-height:calc(100dvh - 32px);color:var(--ink);background:#f8f7f3;border-radius:12px;padding:28px;overflow:auto}.backup-dialog::backdrop{background:#20263880}.backup-dialog h2{margin:14px 0;font-size:26px}.backup-dialog p{font-size:13px;line-height:1.7}.backup-filename{overflow-wrap:anywhere;color:var(--muted)}.backup-details{margin:22px 0;font-size:13px}.backup-details>div{grid-template-columns:1fr 1fr;gap:12px;margin:12px 0;display:grid}.backup-details dt{color:var(--muted)}.backup-details dd{margin:0}.backup-dialog .backup-buttons{justify-content:flex-end;margin-top:22px}@media (width<=600px){.backup-heading{flex-direction:column;align-items:flex-start;gap:10px}.backup-dialog{padding:22px}}.execution-terminal{color:#e6edf5;background:#151c26;border:1px solid #3d4859;border-radius:8px;margin:18px 0;overflow:hidden}.terminal-heading{font-family:var(--mono);color:#c0cede;background:#222c39;border-bottom:1px solid #3d4859;flex-wrap:wrap;align-items:center;gap:12px;padding:12px 16px;font-size:12px;display:flex}.terminal-heading strong{color:#a5ddad;margin-left:auto;font-size:11px;font-weight:600}.failed .terminal-heading strong{color:#ffb3ad}.terminal-lights{gap:5px;display:inline-flex}.terminal-lights i{background:#ec827c;border-radius:50%;width:7px;height:7px}.terminal-lights i:nth-child(2){background:#e3c77b}.terminal-lights i:nth-child(3){background:#8ab995}.terminal-body{scrollbar-color:#5c6a7d #151c26;min-height:100px;max-height:360px;padding:20px;overflow:auto}.terminal-body:focus-visible{outline-offset:-3px;outline:3px solid #c49c74}.terminal-block+.terminal-block{border-top:1px solid #354151;margin-top:22px;padding-top:18px}.terminal-label{font-family:var(--mono);letter-spacing:.8px;color:#adbed2;margin-bottom:8px;font-size:11px;line-height:1.7;display:block}.terminal-type{letter-spacing:0;text-transform:none}.execution-terminal .terminal-text{white-space:pre-wrap;overflow-wrap:anywhere;tab-size:4;margin:0;font-size:16px;line-height:1.75}.terminal-diagnostic .terminal-text{color:#ffb3ad}@media (width<=580px){.terminal-heading{gap:9px;padding:11px 14px}.terminal-body{padding:17px 14px}.terminal-lights{display:none}}:root{color:#252c40;font-synthesis:none;--ink:#252c40;--muted:#767a83;--line:#ddded8;--accent:#be6846;--green:#436b56;--mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;background:#f4f3ee;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-weight:400}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button{transition:background .16s,border-color .16s,transform .16s}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline-offset:4px;outline:3px solid #b17653}button:active:not(:disabled){transform:translateY(1px)}button svg{flex-shrink:0}pre,code{font-family:var(--mono)}pre{white-space:pre-wrap;overflow-wrap:anywhere;margin:0;font-size:14px;line-height:1.7}button{border:0}h1,h2,h3,p{margin-top:0}h1,h2,h3{letter-spacing:-.045em;font-weight:550}h2{font-size:25px;line-height:1.25}h3{font-size:18px}p{line-height:1.6}.app{flex-direction:column;min-height:100vh;display:flex}.header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;height:88px;padding:0 5.4%;display:flex}.wordmark{letter-spacing:-1.3px;color:var(--ink);background:0 0;align-items:center;gap:11px;padding:0;font-size:29px;font-weight:700;display:flex}.logo-mark{background:var(--ink);color:#f0c18b;letter-spacing:-2px;width:36px;height:36px;font-size:19px;font-family:var(--mono);border-radius:10px;place-items:center;padding-right:3px;display:grid}.logo-dot{color:var(--accent)}.header-center{color:#757982;align-items:center;gap:10px;font-size:13px;display:flex}.language-mark{font-family:var(--mono);color:#5f664c;background:#e7e9dd;border:1px solid #d9ddca;border-radius:5px;padding:3px 5px;font-size:13px;font-weight:600}.header-divider{background:var(--line);width:1px;height:16px;margin:0 3px}.save-status{color:var(--muted);align-items:center;gap:8px;font-size:12px;display:flex}.status-dot{background:#7f9875;border-radius:50%;flex-shrink:0;width:6px;height:6px;display:inline-block}.status-dot.loading{background:#c6985c;animation:1.2s infinite pulse}.warning .status-dot{background:#c77b48}@keyframes pulse{50%{opacity:.35}}.page{width:min(1240px,89.2%);margin:0 auto}.welcome{padding:59px 0 45px;position:relative;overflow:hidden}.eyebrow{letter-spacing:1.75px;color:#7b7c7d;font-size:10px;font-weight:650;display:block}.welcome .eyebrow{align-items:center;gap:9px;display:flex}.tiny-dash{background:var(--accent);width:20px;height:1px}.welcome h1{margin:20px 0;font-size:clamp(34px,3.5vw,49px);line-height:1.16}.welcome h1>span{color:#898b89}.intro{color:#72767f;margin-bottom:22px;font-size:15px;line-height:1.75}.welcome-meta{color:#777b80;align-items:center;gap:26px;font-size:11px;display:flex}.welcome-meta>span{align-items:center;gap:7px;display:flex}.hero-decoration{color:#6b706a;background:#eeeee7;border:1px solid #d5d7cf;border-radius:10px;width:276px;padding:20px 22px;position:absolute;top:66px;right:4%;transform:rotate(-5deg);box-shadow:8px 10px #e6e6dd}.deco-caption{letter-spacing:1.9px;border-bottom:1px dashed #cfd2c7;padding-bottom:16px;font-size:9px}.deco-code{font-family:var(--mono);padding:18px 0;font-size:13px;line-height:2}.deco-code>span{color:#aa6544}.deco-bottom{font-family:var(--mono);border-top:1px dashed #cfd2c7;justify-content:space-between;padding-top:12px;font-size:11px;display:flex}.home-grid{grid-template-columns:minmax(0,1fr) 300px;align-items:start;gap:36px;padding-bottom:37px;display:grid}.section-heading{justify-content:space-between;align-items:center;gap:20px;margin:4px 0 23px;display:flex}.section-heading h2{margin:9px 0 0;font-size:23px}.mixed-button{color:#6c735d;white-space:nowrap;background:0 0;border:1px solid #d4d6ce;border-radius:6px;padding:9px 12px;font-size:11px}.mixed-button.selected{background:#e6eadf;border-color:#d3dac9}.mixed-button span{margin-left:9px}.topics-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:13px;display:grid}.topic-card{text-align:left;min-height:182px;color:var(--ink);background:#f8f7f3;border:1px solid #ddded6;border-radius:9px;padding:20px 18px 15px}.topic-card:hover{background:#fffefa;border-color:#acb0a1}.topic-card.active{background:#f8f9f3;border-color:#aeb8a2}.topic-top{justify-content:space-between;align-items:center;margin-bottom:18px;display:flex}.topic-icon{font-family:var(--mono);color:#647154;font-size:19px;line-height:1}.selection-check{color:#fff;background:0 0;border:1px solid #d4d8ce;border-radius:5px;justify-content:center;align-items:center;width:18px;height:18px;display:flex}.active .selection-check{background:#738064;border-color:#738064}.topic-card h3{letter-spacing:-.035em;margin-bottom:8px;font-size:16px}.topic-card p{color:#7c8083;min-height:36px;margin:0;font-size:11px;line-height:1.6}.topic-footer{color:#848982;border-top:1px solid #e2e4da;justify-content:space-between;align-items:center;gap:5px;margin-top:16px;padding-top:12px;font-size:9px;display:flex}.topic-footer>span:last-child{color:#7e8874}.subtle{color:#7a7e86;font-size:12px;line-height:1.7}.topic-note{margin-top:18px;font-size:11px}.session-builder{background:#ecece4;border:1px solid #dedfd4;border-radius:10px;padding:27px 24px}.session-builder h2{letter-spacing:-1px;margin:12px 0 24px;font-size:29px;line-height:1.17}.field-label{color:#666c74;margin-bottom:9px;font-size:11px;font-weight:600;display:block}.session-builder select{color:#434b56;background:#f7f7f1;border:1px solid #d6d8cc;border-radius:6px;width:100%;padding:11px 7px;font-size:11px}.toggle-row{cursor:pointer;color:#737973;align-items:center;gap:9px;margin:17px 0 25px;font-size:10px;display:flex;position:relative}.toggle-row input{opacity:0;width:29px;height:17px;margin:0;position:absolute}.toggle-track{background:#d1d4ca;border-radius:10px;flex-shrink:0;width:29px;height:17px;transition:background .2s;position:relative}.toggle-track:after{content:"";background:#fff;border-radius:50%;width:11px;height:11px;transition:left .2s;position:absolute;top:3px;left:3px}.toggle-row input:checked+.toggle-track{background:#728565}.toggle-row input:checked+.toggle-track:after{left:15px}.toggle-row input:focus-visible+.toggle-track{outline-offset:4px;outline:3px solid #b17653}.time-options{border:1px solid #d6d8cc;border-radius:6px;gap:3px;padding:3px;display:flex}.time-options button{color:#777d77;background:0 0;border-radius:4px;flex:1;padding:8px 0;font-size:11px}.time-options button.chosen{color:#333e43;background:#f9f9f3;box-shadow:0 1px 4px #0000000c}.builder-separator{border-top:1px solid #d5d7cb;margin:23px 0 17px}.session-count{color:#757c71;justify-content:space-between;align-items:center;font-size:11px;display:flex}.small-code{font-family:var(--mono);color:#818775;background:#e1e4d8;border-radius:4px;padding:2px 5px;font-size:11px}.primary{background:var(--ink);color:#fbfbf4;border:1px solid var(--ink);border-radius:6px;justify-content:center;align-items:center;gap:15px;padding:12px 18px;font-size:12px;font-weight:550;line-height:1.4;display:inline-flex}.primary:hover:not(:disabled){background:#3d455b}.start-button{justify-content:space-between;width:100%;min-height:48px;margin-top:15px;padding:13px 15px;font-size:12px}.builder-note{text-align:center;color:#8a8d85;margin:13px 0 19px;font-size:10px;line-height:1.7}.engine-status{color:#888e80;border-top:1px solid #daddcf;justify-content:center;align-items:center;gap:7px;padding-top:15px;font-size:9px;display:flex}.empty-selection{color:#a06140;margin:12px 0 0;font-size:11px}.progress-strip{border-top:1px solid var(--line);align-items:center;gap:50px;padding:27px 0 38px;display:flex}.progress-strip>div:first-child{margin-right:auto}.progress-strip p{color:#80838a;margin:8px 0 0;font-size:12px}.progress-stat{flex-direction:column;gap:7px;display:flex}.progress-stat strong{font-family:var(--mono);letter-spacing:-1.3px;font-size:24px;font-weight:400}.progress-stat strong span{color:#a6aaa8;letter-spacing:0;font-size:14px}.progress-stat>span{color:#858a8e;font-size:10px}.text-button{color:#737984;background:0 0;align-items:center;gap:9px;padding:8px 0;font-size:11px;display:inline-flex}.text-button:hover{color:#273549}.footer{border-top:1px solid var(--line);color:#91958f;justify-content:space-between;gap:15px;width:89.2%;margin:auto auto 0;padding:22px 0;font-size:10px;display:flex}.footer-muted{color:#b0b3ae}.resume-bar{background:#e3e8da;border:1px solid #ccd6c0;border-radius:8px;align-items:center;gap:20px;margin-bottom:28px;padding:17px 20px;display:flex}.resume-bar>div{flex-direction:column;gap:5px;margin-right:auto;font-size:12px;display:flex}.resume-bar>div>span{color:#7a8371;font-size:11px}.notice{color:#8a573b;background:#f2e5d5;border:1px solid #d9baa0;border-radius:6px;width:89.2%;margin:18px auto 0;padding:12px 18px;font-size:12px;line-height:1.6}.notice button{color:#6f452f;background:0 0;padding:0 6px;text-decoration:underline}.practice-heading{justify-content:space-between;align-items:center;gap:15px;padding:28px 0 27px;font-size:12px;display:flex}.back-button{color:#757c86;background:0 0;padding:7px 0;font-size:11px}.session-time{color:#8c9297;align-items:center;gap:7px;font-size:11px;display:flex}.session-time>span{font-family:var(--mono);color:#444d58;font-size:15px}.practice-grid{grid-template-columns:225px minmax(0,1fr);align-items:start;gap:45px;padding-bottom:48px;display:grid}.session-sidebar{padding-top:17px}.session-sidebar h2{margin:12px 0;font-size:25px}.session-sidebar>p{color:#8b9096;font-size:12px}.sidebar-counter{flex-direction:column;gap:6px;padding:24px 0 22px;display:flex}.sidebar-counter>strong{font-family:var(--mono);letter-spacing:-2px;font-size:42px;font-weight:400}.sidebar-counter>span{color:#8a8f94;font-size:10px}.sidebar-metrics{border-top:1px solid var(--line);flex-direction:column;gap:17px;padding-top:20px;display:flex}.sidebar-metrics>div{color:#8d9296;justify-content:space-between;font-size:11px;display:flex}.sidebar-metrics strong{color:#5e6872;font-family:var(--mono)}.session-progress-track{background:#e2e3dd;border-radius:3px;height:3px;margin:21px 0;overflow:hidden}.session-progress-track>div{background:#9caa85;height:100%;transition:width .5s}.sidebar-topics{flex-direction:column;gap:9px;display:flex}.sidebar-topics .eyebrow{margin:14px 0 4px}.sidebar-topics>span:not(.eyebrow){color:#8b9293;font-size:11px}.sidebar-tip{align-items:flex-start;gap:9px;margin-top:29px;line-height:1.8;display:flex;font-size:10px!important}.sidebar-tip svg{color:#7f8a74;flex-shrink:0;margin-top:2px}.exercise-panel{background:#fcfbf7;border:1px solid #e0e1d9;border-radius:12px;min-width:0;padding:30px 34px;box-shadow:0 4px 12px #282c3503}.exercise-topline{justify-content:space-between;align-items:center;gap:10px;margin-bottom:26px;display:flex}.exercise-category{color:#687559;align-items:center;gap:10px;font-size:11px;display:flex}.exercise-category>span{color:#979c91;font-size:10px}.card-number{color:#a0a5a4;font-family:var(--mono);font-size:10px}.task{letter-spacing:-.035em;max-width:680px;margin-bottom:17px;font-size:clamp(24px,2.25vw,31px);line-height:1.35}.mode-description{color:#92969a;flex-wrap:wrap;align-items:center;gap:10px;font-size:10px;line-height:1.7;display:flex}.mode-description code{color:#6f7680;font-size:10px}.mode-tag{letter-spacing:.4px;color:#748367;background:#edf0e7;border:1px solid #d5dacc;border-radius:4px;padding:3px 7px;font-size:9px}.mode-tag.statement{color:#9c8465;background:#f2ece2;border-color:#e1d6c7}.question-context{background:#f3f4ed;border:1px solid #e2e3db;border-radius:7px;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);margin:25px 0 26px;display:grid;overflow:hidden}.starting-code{padding:16px 18px}.code-label{color:#979c94;letter-spacing:1.4px;justify-content:space-between;align-items:center;gap:10px;margin-bottom:11px;font-family:inherit;font-size:8px;font-weight:600;display:flex}.code-label>span{font-family:var(--mono);letter-spacing:0;font-size:9px;font-weight:400}.starting-code pre{color:#596251;font-size:12px}.expected-result{background:#edf0e6;border-left:1px solid #e1e4d8;min-width:0;padding:16px 18px}.expected-result pre{color:#53604b;font-size:12px}.no-setup{color:#93978f;margin:0;font-size:11px;line-height:1.8}.answer-heading{color:#737984;justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px;font-size:11px;display:flex}.answer-heading>label{font-weight:600}.answer-heading>span{color:#a0a4a2;font-size:9px}.answer-editor{background:#fefefd;border:1px solid #cdd2d0;border-radius:7px;min-height:96px;padding:15px 0 12px;transition:border-color .15s;display:flex}.answer-editor:focus-within{border-color:#8b9a84;box-shadow:0 0 0 3px #879d7620}.editor-line{color:#c0c5c3;font-family:var(--mono);text-align:center;flex-shrink:0;width:42px;padding-top:1px;font-size:13px}.answer-editor textarea{resize:vertical;min-height:65px;font-family:var(--mono);color:#273647;tab-size:4;background:0 0;border:0;outline:0;width:100%;padding:0 16px 0 0;font-size:14px;line-height:1.6}.answer-editor textarea::placeholder{color:#b2b8b2;font-size:12px}.answer-editor.correct{background:#f5faf6;border-color:#92b2a0}.answer-editor.incorrect{background:#fbf8f3;border-color:#d3b8a3}.answer-editor textarea:disabled{opacity:1;color:#65766d}.answer-actions{justify-content:flex-end;align-items:center;gap:24px;margin-top:18px;display:flex}.shortcut{color:#a2a7a4;margin-right:auto;font-size:9px}.shortcut kbd{background:#f7f8f2;border:1px solid #e2e4de;border-radius:3px;padding:3px 5px;font-family:inherit;font-size:9px}.revisit-tag{color:#ad7853;align-items:center;gap:6px;margin:-9px 0 18px;font-size:10px;display:flex}.feedback{border-top:1px solid #e2e4db;margin-top:22px;padding-top:22px;font-size:12px}.feedback-title{color:#4c7760;align-items:center;gap:9px;font-size:13px;display:flex}.feedback-title strong{font-weight:550}.feedback-icon{background:#e6eee4;border-radius:50%;justify-content:center;align-items:center;width:23px;height:23px;display:flex}.miss .feedback-title{color:#a4704c}.miss .feedback-icon{background:#f2e7d9}.error-detail{font-family:var(--mono);color:#94775e;overflow-wrap:anywhere;margin:14px 0;font-size:11px;line-height:1.7}.reference{background:#f0f1e9;border-radius:6px;margin-bottom:13px;padding:14px 17px}.reference .code-label{font-size:8px}.reference pre{color:#4d5e4a;font-size:13px}.explanation{color:#91968e;font-size:10px}.explanation summary{cursor:pointer;width:fit-content;padding:3px 0}.explanation p{color:#788071;margin:10px 0}.explanation pre{color:#61765e;margin:10px 0;font-size:12px}.success-detail{color:#8b988c;margin:11px 0 9px;font-size:11px}.feedback-bottom{justify-content:space-between;align-items:center;gap:15px;margin-top:19px;display:flex}.feedback-bottom>span{color:#999d94;font-size:10px}.summary-page{text-align:center;max-width:810px;padding:65px 0 60px}.summary-symbol{color:#7e926b;background:#e9eedf;border:1px solid #cdd7c4;border-radius:50%;place-items:center;width:54px;height:54px;margin:0 auto 24px;display:grid}.summary-page>h1{margin:18px 0 13px;font-size:38px}.summary-stats{background:#f8f9f2;border:1px solid #dadfd2;border-radius:10px;grid-template-columns:repeat(3,1fr);margin:32px 0 18px;display:grid;overflow:hidden}.summary-stats>div{border-right:1px solid #e1e4da;flex-direction:column;gap:11px;padding:26px 15px;display:flex}.summary-stats>div:last-child{border:0}.summary-stats strong{font-family:var(--mono);letter-spacing:-1px;font-size:32px;font-weight:400}.summary-stats span{color:#8b9388;font-size:11px}.review-panel{text-align:left;background:#edede5;border:1px solid #dcded4;border-radius:9px;margin:32px 0 27px;padding:27px 30px}.review-panel h2{margin:11px 0;font-size:24px}.review-panel p{color:#858b81;margin:0;font-size:12px}.review-topics{flex-wrap:wrap;gap:8px;margin-top:21px;display:flex}.review-topics>span{color:#7a866d;background:#f6f7f0;border:1px solid #d8dccf;border-radius:5px;align-items:center;gap:7px;padding:7px 10px;font-size:10px;display:flex}.summary-actions{justify-content:center;gap:12px;display:flex}.secondary{color:#6a7269;background:0 0;border:1px solid #ccd0c4;border-radius:6px;padding:12px 18px;font-size:12px}.secondary:hover{background:#e7e9e0}@media (width>=1500px){.welcome h1{font-size:49px}.page{width:min(1240px,89.2%)}.hero-decoration{right:7%}}@media (width<=1150px){.hero-decoration{width:240px;top:77px;right:1%}.home-grid{grid-template-columns:minmax(0,1fr) 260px;gap:24px}.session-builder{padding:25px 19px}.topics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.topic-card{min-height:169px}.section-heading{align-items:flex-start}.section-heading h2{max-width:230px;font-size:21px}.mixed-button{margin-top:17px}.practice-grid{grid-template-columns:185px minmax(0,1fr);gap:28px}.exercise-panel{padding:26px}.shortcut{display:none}.answer-actions{gap:20px}.welcome h1{font-size:39px}.welcome .intro{max-width:520px}.hero-decoration{width:220px}.deco-code{font-size:11px}}@media (width<=850px){.hero-decoration,.header-center{display:none}.page{width:90%}.header{height:76px;padding:0 5%}.home-grid{grid-template-columns:1fr;gap:20px}.topics-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.session-builder{grid-template-columns:1fr 1fr;gap:0 30px;display:grid}.session-builder .eyebrow,.session-builder h2,.session-builder .field-label,.session-builder select,.session-builder .toggle-row,.session-builder .time-options{grid-column:1}.session-builder .builder-separator{display:none}.session-builder .session-count{grid-area:2/2;align-self:center;margin-top:20px}.session-builder .start-button{grid-area:3/2;align-self:start;margin-top:12px}.session-builder .builder-note{grid-area:4/2;margin:14px 0}.session-builder .engine-status{grid-area:5/2;align-self:start}.session-builder .empty-selection{grid-area:6/2}.session-builder h2{margin-bottom:18px}.session-builder .toggle-row{margin-bottom:20px}.progress-strip{gap:28px;padding:25px 0}.practice-grid{grid-template-columns:1fr;gap:15px}.session-sidebar{display:none}.practice-heading,.practice-heading .back-button,.practice-heading .text-button{font-size:10px}.welcome{padding:39px 0 35px}.resume-bar{flex-wrap:wrap;gap:12px}.resume-bar>div{width:100%}.summary-page{padding-top:45px}.footer{width:90%}}@media (width<=580px){.header{height:70px}.wordmark{font-size:26px}.save-status{gap:5px;font-size:9px}.logo-mark{width:32px;height:32px;font-size:17px}.welcome .eyebrow{letter-spacing:1.2px;font-size:8px}.welcome h1{margin:18px 0;font-size:34px}.welcome .intro{font-size:13px;line-height:1.8}.desktop-break{display:none}.welcome-meta{flex-wrap:wrap;gap:12px;font-size:9px}.welcome-meta svg{width:13px}.section-heading{gap:10px;margin-bottom:19px}.section-heading .eyebrow{font-size:8px}.section-heading h2{font-size:21px}.mixed-button{white-space:normal;align-items:center;margin-top:13px;padding:9px;font-size:9px;display:flex}.mixed-button span{margin-left:4px}.topics-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.topic-card{padding:16px 14px 13px}.topic-card h3{font-size:14px}.topic-card p{font-size:10px}.topic-footer{gap:4px;font-size:8px}.topic-top{margin-bottom:14px}.topic-icon{font-size:18px}.selection-check{width:16px;height:16px}.topic-note{font-size:10px}.session-builder{padding:25px;display:block}.session-builder h2{margin-bottom:24px;font-size:27px}.session-builder .builder-separator{display:block}.session-builder .session-count{margin:0}.session-builder .start-button{margin:17px 0 0}.session-builder .builder-note{margin:15px 0}.progress-strip{flex-wrap:wrap;gap:25px}.progress-strip>div:first-child{width:100%;margin:0}.progress-strip .text-button{margin-left:auto}.progress-stat>span{font-size:9px}.footer{gap:10px;padding:18px 0;font-size:8px}.practice-heading{flex-wrap:wrap;gap:5px;padding:20px 0}.practice-heading .back-button{order:1}.practice-heading .text-button{order:2;margin-left:auto}.practice-heading .session-time{order:3;justify-content:center;width:100%;margin-top:12px;font-size:10px}.exercise-panel{border-radius:9px;padding:23px 19px}.exercise-topline{margin-bottom:22px}.exercise-category{gap:7px;font-size:9px}.exercise-category>span{font-size:8px}.card-number{font-size:9px}.task{font-size:25px}.mode-description{gap:7px;font-size:10px}.question-context{grid-template-columns:1fr;margin:23px 0}.expected-result{border-top:1px solid #e1e4d8;border-left:0;padding:12px 15px}.starting-code{padding:14px 15px}.starting-code pre,.expected-result pre{font-size:11px}.code-label{font-size:7px}.answer-actions{gap:14px;margin-top:15px}.answer-actions .primary{padding:11px 14px;font-size:11px}.answer-actions .text-button{margin-right:auto;font-size:10px}.feedback-title{font-size:12px}.feedback-bottom{flex-wrap:wrap;gap:13px}.feedback-bottom .primary{margin-left:auto;font-size:11px}.feedback-bottom>span{font-size:9px}.error-detail{font-size:10px}.answer-editor textarea{font-size:13px}.editor-line{width:30px;font-size:12px}.answer-heading{font-size:10px}.answer-heading>span{font-size:8px}.summary-page>h1{font-size:31px;line-height:1.2}.summary-page .intro{font-size:13px}.summary-page>.eyebrow{font-size:8px}.summary-stats strong{font-size:27px}.summary-stats span{font-size:9px}.summary-stats>div{padding:22px 8px}.summary-page>.subtle{font-size:10px}.review-panel{padding:23px}.review-panel h2{font-size:22px}.review-panel p{font-size:11px}.summary-actions{flex-wrap:wrap}.summary-actions button{width:100%}.notice{font-size:11px}}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}.after-condition{color:#8a927f;margin:10px 0 0;font-size:9px;line-height:1.8}.after-condition code{font-size:9px}.toggle-row input{z-index:1;cursor:pointer}.toggle-track{pointer-events:none}.track-tabs{grid-template-columns:repeat(4,minmax(0,1fr));gap:11px;margin:0 0 27px;display:grid}.track-tabs button{text-align:left;color:#697261;background:#f9f8f4;border:1px solid #d9ddd2;border-radius:8px;align-items:center;gap:10px;min-width:0;padding:17px 14px;display:flex}.track-tabs button.active{background:#e9edde;border-color:#8f9b81}.track-tabs button:hover{border-color:#a3ad94}.track-tabs button>span:nth-child(2){flex-direction:column;gap:5px;min-width:0;display:flex}.track-tabs strong{color:#424d43;font-size:13px;font-weight:600}.track-tabs small{color:#8c9386;font-size:9px;line-height:1.5}.track-count{font-size:10px;font-family:var(--mono);color:#8c9981;margin-left:auto}.track-tabs .language-mark{flex-shrink:0;font-size:10px}.course-mode{background:#e9edde;border:1px solid #d7decf;border-radius:8px;justify-content:space-between;align-items:center;gap:20px;margin-bottom:25px;padding:19px 22px;display:flex}.course-mode>div:first-child{flex-direction:column;gap:6px;display:flex}.course-mode strong{color:#627256;font-size:13px;font-weight:550}.course-mode span{color:#8a967d;font-size:11px}.course-mode [role=group]{border:1px solid #d2d9c5;border-radius:6px;flex-shrink:0;gap:4px;padding:3px;display:flex}.course-mode button{color:#889577;background:0 0;border-radius:4px;padding:9px 13px;font-size:11px}.course-mode button.active{color:#5a6d4c;background:#fafbf6;box-shadow:0 1px 3px #0000000a}.time-options{grid-template-columns:repeat(4,minmax(0,1fr));display:grid}.time-options button{white-space:nowrap;font-size:10px}.lesson-card{color:#7c8c6c;background:#f1f4ea;border:1px solid #d8e0ce;border-radius:7px;margin:-3px 0 24px;padding:15px 17px;font-size:12px;line-height:1.6}.lesson-card summary{cursor:pointer;font-size:11px;font-weight:550}.lesson-card p{color:#78816e;margin:13px 0;font-size:12px;line-height:1.8}.lesson-card pre{color:#718066;background:#fafcf5;border:1px solid #e0e6d6;border-radius:5px;padding:12px 14px;font-size:11px}.choice-options{border:0;flex-direction:column;gap:9px;margin:0;padding:0;display:flex}.choice-options label{color:#707b68;cursor:pointer;background:#f8f9f2;border:1px solid #dcdfd4;border-radius:7px;align-items:center;gap:12px;padding:15px;font-size:12px;line-height:1.7;display:flex}.choice-options label:hover{border-color:#a9b499}.choice-options label.chosen{background:#eaf0df;border-color:#9fab8e}.choice-options input{accent-color:#72875f;flex-shrink:0;margin:0}.choice-letter{font-family:var(--mono);color:#98a287;font-size:10px}.choice-options:disabled label{cursor:default}.hint-panel{color:#9b875e;background:#f8f1e3;border:1px solid #dfd6c3;border-radius:6px;margin-top:16px;padding:14px 17px;font-size:11px}.hint-panel strong{font-weight:550}.hint-panel p{margin:8px 0;line-height:1.8}.hint-panel small{color:#b3a17b;font-size:9px}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.mixed-button{align-items:center;gap:9px;display:flex}.answer-actions{flex-wrap:wrap;gap:15px}@media (width<=1050px){.track-tabs small{display:none}.track-tabs button{padding:14px 12px}.course-mode{flex-wrap:wrap}.time-options{grid-template-columns:repeat(4,minmax(0,1fr))}}@media (width<=850px){.track-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.track-tabs small{display:block}.course-mode [role=group]{margin-left:auto}.session-builder .engine-status{grid-row:6}.session-builder .empty-selection{grid-row:7}}@media (width<=580px){.track-tabs{gap:8px;margin-bottom:22px}.track-tabs button{gap:7px;padding:13px 10px}.track-tabs small{font-size:8px}.track-tabs strong{font-size:12px}.track-count{display:none}.course-mode{gap:15px;padding:17px}.course-mode strong{font-size:12px}.course-mode span{font-size:10px;line-height:1.7}.course-mode [role=group]{width:100%;margin-left:0}.course-mode button{flex:1}.lesson-card{margin-bottom:20px;padding:14px}.lesson-card p{font-size:11px}.lesson-card pre{padding:10px;font-size:10px}.lesson-card summary{font-size:10px}.choice-options label{gap:9px;padding:13px;font-size:11px}.answer-editor textarea{font-size:16px}.answer-actions{gap:12px}.answer-actions .text-button{margin-right:0}.answer-actions .primary{margin-left:auto}.time-options button{font-size:11px}.footer{flex-wrap:wrap}}.correct-explanation{color:#6f7d62;margin:0;font-size:12px;line-height:1.8}.mode-description code{overflow-wrap:anywhere}.retry-example{margin-bottom:20px}.retry-example>p{color:#94775e;margin:0 0 12px;font-size:11px}.feedback-buttons{flex-wrap:wrap;gap:10px;margin-left:auto;display:flex}.feedback-buttons .secondary{justify-content:center;align-items:center;gap:10px;display:inline-flex}@media (width<=580px){.feedback-buttons{width:100%}.feedback-buttons>button{flex:1;min-height:44px}.feedback-buttons .secondary{padding:11px 14px;font-size:11px}}
