:root{--background:#f7f7f4;--foreground:#1d1d1f;--muted:#666b73;--panel:#fff;--border:#d9d9d2;--accent:#0f766e;--accent-strong:#115e59;--danger:#b42318;--success:#087443}*{box-sizing:border-box}body{background:var(--background);color:var(--foreground);margin:0;font-family:Arial,Helvetica,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}code,pre{font-family:Consolas,Courier New,monospace}.page{width:min(1180px,100vw - 32px);margin:0 auto;padding:32px 0}.admin-page{width:min(1380px,100vw - 40px);overflow-x:hidden}.narrow-page{width:min(640px,100vw - 32px)}.topbar{justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px;display:flex}.global-nav{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:18px;margin-bottom:24px;padding:16px 0;display:flex}.brand-block h1{margin:0;font-size:24px;line-height:1.2}.brand-block p{color:var(--muted);margin:6px 0 0;line-height:1.5}.inline-link,.reference-link{color:#0b63ce;text-underline-offset:3px;text-decoration:underline}.user-menu{position:relative}.user-menu-button{border:1px solid var(--border);min-height:40px;color:var(--foreground);background:#fff;border-radius:8px;padding:8px 12px;font-weight:700}.user-menu-popover{z-index:20;border:1px solid var(--border);background:#fff;border-radius:8px;width:280px;margin-top:8px;padding:16px;position:absolute;right:0;box-shadow:0 16px 36px #0000001f}.user-menu-popover p{color:var(--muted);margin:0 0 10px}.eyebrow{color:var(--accent-strong);letter-spacing:0;text-transform:uppercase;margin:0 0 6px;font-size:12px;font-weight:700}.title{margin:0;font-size:28px;line-height:1.2}.subtitle{color:var(--muted);margin:8px 0 0;line-height:1.5}.unit-list{gap:12px;display:grid}.dashboard-layout{grid-template-columns:minmax(0,1fr) 340px;align-items:start;gap:24px;display:grid}.study-units-column,.dashboard-sidebar{gap:16px;display:grid}.section-heading-row,.unit-card-heading,.unit-header{justify-content:space-between;align-items:center;gap:16px;display:flex}.unit-header{border:1px solid var(--border);background:var(--panel);border-radius:8px;margin-bottom:20px;padding:20px}.unit-header h2,.section-heading-row h2,.profile-panel h2,.progress-panel h2{margin:0}.unit-link,.panel{background:var(--panel);border:1px solid var(--border);border-radius:8px}.unit-link{padding:18px;display:block}.unit-link:hover{border-color:var(--accent)}.unit-link h3{margin:0}.locked-unit{opacity:.68}.unit-link h2,.panel h2,.panel h3{margin:0}.unit-link p,.panel p{color:var(--muted);line-height:1.5}.stepbar{flex-wrap:wrap;gap:8px;margin:24px 0;scroll-margin-top:16px;display:flex}.step-button,.primary-button,.secondary-button,.choice-button{border:1px solid var(--border);color:var(--foreground);background:#fff;border-radius:8px}.step-button{padding:8px 12px}.step-button.active,.primary-button{border-color:var(--accent);background:var(--accent);color:#fff}.step-button:disabled,.primary-button:disabled,.secondary-button:disabled,.choice-button:disabled{cursor:not-allowed;opacity:.45}.step-button:disabled{color:var(--muted);background:#f1f1ee}.primary-button,.secondary-button,.primary-link{border-radius:8px;justify-content:center;align-items:center;padding:10px 14px;display:inline-flex}.primary-link{background:var(--accent);color:#fff}.secondary-button{color:var(--foreground);background:#fff}.choice-list{gap:8px;margin-top:14px;display:grid}.choice-button{width:fit-content;min-width:48px;padding:8px 12px}.choice-button.selected{border-color:var(--accent);color:var(--accent-strong);background:#e8f3f1}.quiz-question{white-space:pre-line;overflow-wrap:anywhere}.panel{padding:20px}.code-block{color:#f5f5f5;background:#202124;border-radius:8px;padding:14px;line-height:1.5;overflow:auto}.coding-section{gap:16px;display:grid}.coding-task-switcher{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.task-switch-button{border:1px solid var(--border);min-height:74px;color:var(--foreground);text-align:left;background:#fff;border-radius:8px;gap:4px;padding:12px 14px;display:grid}.task-switch-button.active{border-color:var(--accent);background:#e8f3f1}.task-switch-button span,.task-switch-button small{color:var(--muted)}.task-switch-button strong{color:var(--foreground)}.coding-top-layout{grid-template-columns:minmax(280px,.78fr) minmax(420px,1.42fr);align-items:stretch;gap:16px;display:grid}.coding-description-panel{height:var(--coding-right-panel-height,574px);max-height:var(--coding-right-panel-height,574px);overflow:auto}.coding-editor-panel{align-content:start;gap:16px;display:grid}.coding-editor-measure{min-height:500px}.coding-controls-row{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}.coding-results-grid{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:16px;display:grid}.coding-result-card{min-width:0}.coding-results-grid .code-quality-panel{height:100%;margin-top:0}.editor-shell{border:1px solid var(--border);background:#1e1e1e;border-radius:8px;min-height:500px;overflow:hidden}.tag-row{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.tag{color:var(--accent-strong);background:#e8f3f1;border-radius:999px;padding:4px 8px;font-size:12px}.status-pill{min-height:26px;color:var(--accent-strong);background:#e8f3f1;border-radius:999px;align-items:center;padding:4px 8px;font-size:12px;font-weight:700;display:inline-flex}.status-pill.locked{color:var(--muted);background:#eeeeea}.status-pill.completed{color:var(--success);background:#e8f5ee}.status-pill.in_progress{color:#9a4f00;background:#fff2df}.recording-status{align-items:center;gap:8px;font-weight:700;display:inline-flex}.recording-status.is-recording{color:var(--success)}.recording-status.is-idle{color:var(--muted)}.recording-dot{background:currentColor;border-radius:999px;width:10px;height:10px}.full-width{width:100%;margin-top:16px}.progress-track{background:#ecece7;border-radius:999px;height:10px;overflow:hidden}.progress-track span{border-radius:inherit;background:var(--accent);height:100%;display:block}.submit-result-panel{width:100%}.submit-result-heading{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.submit-result-heading h2{margin:0}.test-summary-list{gap:6px;margin:12px 0;padding-left:18px;display:grid}.code-quality-panel{border:1px solid var(--border);background:#fbfbf8;border-radius:8px;gap:10px;margin-top:16px;padding:16px;display:grid}.code-quality-panel.compact{padding:12px}.code-quality-heading,.quality-issue-heading{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.code-quality-heading h3{margin:0}.coding-hint-launcher{z-index:45;border:1px solid var(--accent);background:var(--accent);color:#fff;border-radius:999px;align-items:center;gap:8px;padding:12px 16px;display:inline-flex;position:fixed;bottom:24px;right:24px;box-shadow:0 12px 30px #0000002e}.coding-hint-launcher.has-new{border-color:#f2b705;box-shadow:0 0 0 4px #f2b7052e,0 12px 30px #0000002e}.hint-new-dot{background:#ffd666;border-radius:999px;width:9px;height:9px}.coding-hint-backdrop{z-index:60;background:#10181852;justify-content:flex-end;display:flex;position:fixed;inset:0}.coding-hint-drawer{border-left:1px solid var(--border);background:#fff;width:min(760px,100vw - 32px);height:100%;padding:22px;overflow:auto;box-shadow:-18px 0 36px #00000029}.coding-hint-drawer-header{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px;display:flex}.coding-hint-drawer-header h2{margin:0}.hint-drawer-tabs{border-bottom:1px solid var(--border);flex-wrap:wrap;gap:8px;margin-bottom:16px;padding-bottom:10px;display:flex}.hint-drawer-tabs button{border:1px solid var(--border);color:var(--foreground);background:#fff;border-radius:999px;padding:9px 12px}.hint-drawer-tabs button.active{border-color:var(--accent);color:var(--accent-strong);background:#e8f3f1;font-weight:700}@keyframes hint-flash{0%,to{box-shadow:none}50%{box-shadow:0 0 0 5px #f2b70547}}.hint-comparison-pair.flash-new{border-radius:10px;animation:.8s ease-in-out 2 hint-flash}.quality-score-good{color:var(--success)}.quality-score-warn{color:#9a6700}.quality-score-risk{color:var(--danger)}.quality-details{gap:8px;display:grid}.quality-details details{border-top:1px solid var(--border);padding:10px 0 0}.quality-details summary{cursor:pointer;font-weight:700}.quality-issue-list{gap:10px;margin:10px 0 0;padding:0;list-style:none;display:grid}.quality-issue-list li{border-left:3px solid var(--accent);background:#fff;padding:10px}.quality-issue-list p{margin:6px 0 0}.link-button{width:fit-content;color:var(--accent-strong);cursor:pointer;background:0 0;border:0;margin:4px 0 0;padding:0;font-weight:700}.link-button:hover{text-underline-offset:3px;text-decoration:underline}.result-passed{color:var(--success);font-weight:700}.result-failed{color:var(--danger);font-weight:700}.error-text{color:var(--danger)}.form-panel,.form-grid{gap:16px;display:grid}.form-grid{grid-template-columns:repeat(3,minmax(180px,1fr));align-items:end}.admin-code-form,.admin-generate-form{align-items:end;gap:16px;display:grid}.admin-code-form{grid-template-columns:minmax(240px,1fr) auto}.admin-generate-form{grid-template-columns:repeat(4,minmax(140px,1fr))}.admin-generate-form .wide-field{grid-column:span 2}.admin-generate-form .button-row{align-self:center;margin-top:0}.field-help{color:var(--muted);font-size:12px}.compact-admin-table td,.compact-admin-table th{vertical-align:top}.danger-button{color:var(--danger);border-color:#f0c7c2}.admin-edit-modal{width:min(640px,100%)}.admin-edit-modal .form-panel{grid-template-columns:repeat(2,minmax(180px,1fr))}.admin-export-panel{gap:16px;display:grid}.admin-result-box{border:1px solid var(--border);background:#fbfbf8;border-radius:8px;gap:6px;padding:14px;display:grid}.admin-result-box h3,.admin-result-box p{margin:0}label{color:var(--muted);gap:6px;font-size:14px;display:grid}input{border:1px solid var(--border);min-height:40px;color:var(--foreground);background:#fff;border-radius:8px;padding:8px 10px}select{border:1px solid var(--border);min-height:36px;color:var(--foreground);background:#fff;border-radius:8px;padding:6px 8px}.table-select{width:100%;min-width:120px;max-width:145px}.table-action-button{min-height:36px;padding:7px 10px}textarea{resize:vertical;border:1px solid var(--border);width:100%;color:var(--foreground);background:#fff;border-radius:8px;padding:10px}.checkbox-field{color:var(--foreground);grid-template-columns:none;align-items:center;gap:10px;display:flex}.checkbox-field input{width:auto}.linked-notice-text{gap:8px;display:grid}.linked-notice-text p{white-space:pre-wrap;margin:0}.linked-notice-text a{color:#0b65c2;text-underline-offset:2px;text-decoration:underline}.button-row{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.modal-backdrop{z-index:50;background:#0000005c;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.modal-panel{border:1px solid var(--border);background:#fff;border-radius:8px;width:min(520px,100%);padding:22px;box-shadow:0 20px 50px #0003}.modal-panel h2{margin:0 0 12px}.modal-heading-row{justify-content:space-between;align-items:center;gap:16px;margin-bottom:14px;display:flex}.modal-heading-row h2{margin:0}.raw-result-modal{width:min(780px,100vw - 32px)}.raw-result-block{max-height:min(64vh,620px)}.video-grid{gap:14px;margin:18px 0;display:grid}.video-panel{gap:10px;display:grid}.video-panel h3{margin-bottom:0}.video-panel iframe{aspect-ratio:16/9;border:1px solid var(--border);background:#111;border-radius:8px;width:100%}.reference-list{gap:8px;margin-top:10px;display:grid}.hint-list{gap:12px;margin-top:18px;display:grid}.hint-card{background:#f4f8ff;border:1px solid #a9c7f5;border-radius:8px;padding:14px}.hint-card h3{margin:0}.hint-text{white-space:pre-wrap;overflow-wrap:anywhere}.hint-comparison-list{gap:14px;margin-top:16px;display:grid}.hint-comparison-pair{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.hint-comparison-card{border:1px solid var(--border);background:#fff;border-radius:8px;gap:8px;padding:16px;display:grid}.hint-comparison-card.standard{background:#f5fbfa;border-color:#b8d8d3}.hint-comparison-card.its{background:#f6f8ff;border-color:#c8d4f4}.feedback-section.standard-feedback,.rating-panel.standard{background:#f5fbfa;border-color:#b8d8d3}.feedback-section.tutor-feedback,.rating-panel.its{background:#f6f8ff;border-color:#c8d4f4}.feedback-section.recommendation-panel{background:#fffdf3;border-color:#d8d2b8}.recommendation-summary{background:#fff;border:1px solid #e8dfb7;border-radius:8px;gap:12px;padding:14px;display:grid}.recommendation-source{border:1px solid var(--border);text-transform:uppercase;border-radius:999px;width:fit-content;padding:5px 10px;font-size:12px;font-weight:800}.recommendation-source.ai{color:#1d4d8f;background:#f6f8ff;border-color:#c8d4f4}.recommendation-source.fallback{color:#7a5b00;background:#fff8d8;border-color:#e8dfb7}.recommendation-source-note{color:#6f5a1d;font-size:14px}.hint-comparison-card h3{margin:0}.hint-rating-box{border-top:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:8px;padding-top:8px;display:flex}.hint-rating-icon{border:1px solid var(--border);background:#fff;border-radius:8px;justify-content:center;align-items:center;width:44px;height:40px;font-size:20px;display:inline-flex}.hint-rating-icon.selected{border-color:var(--accent);color:var(--accent-strong);background:#e8f3f1}.lesson-question-panel{border-top:1px solid var(--border);gap:14px;margin-top:22px;padding-top:24px;padding-bottom:34px;display:grid}.lesson-question-panel .button-row{margin-top:4px}.lesson-question-panel .hint-list{margin-top:18px;margin-bottom:4px}.lesson-panel{padding:0;overflow:hidden}.lesson-panel>h2{margin:0;padding:28px 24px 18px;font-size:42px;font-weight:400;line-height:1.15}.lesson-panel>h3,.lesson-panel>.code-block,.lesson-panel>ul,.lesson-panel>.video-grid,.lesson-panel>.reference-list,.lesson-question-panel{margin-left:24px;margin-right:24px}.lesson-sections{gap:0;margin:0 0 24px;display:grid}.lesson-text-section h3,.lesson-example-card h3{margin-bottom:12px}.lesson-text-section{padding:26px 24px}.lesson-text-section-compact{padding-top:6px;padding-bottom:6px}.lesson-text-section-compact+.lesson-text-section-compact{padding-top:2px}.lesson-text-section-compact p{margin:0}.lesson-text-section h3{margin-top:0;font-size:34px;font-weight:400;line-height:1.2}.lesson-text-section p,.lesson-text-section li,.w3-intro-section p,.w3-intro-section li,.w3-note-section p{color:#111;font-size:18px;line-height:1.65}.lesson-image-section{background:#fff;margin:0;padding:26px 24px}.lesson-image-section h3{margin:0 0 14px;font-size:28px;font-weight:400;line-height:1.2}.lesson-image-section img{border:1px solid var(--border);background:#fff;width:min(100%,760px);height:auto;display:block}.lesson-image-section figcaption{max-width:760px;color:var(--muted);margin-top:10px;font-size:14px;line-height:1.5}.lesson-table-section{background:#fff;padding:26px 24px}.lesson-table-section h3{margin:0 0 14px;font-size:28px;font-weight:400;line-height:1.2}.lesson-table-wrap{max-width:100%;overflow-x:auto}.lesson-data-table{border-collapse:collapse;color:#111;border:1px solid #d4d4d4;width:100%;min-width:520px;font-size:17px;line-height:1.45}.lesson-data-table th,.lesson-data-table td{text-align:left;vertical-align:top;border-bottom:1px solid #d4d4d4;padding:12px 16px}.lesson-data-table th{background:#e7e9eb;font-weight:700}.lesson-data-table tbody tr:nth-child(2n){background:#e7e9eb}.lesson-table-caption{color:var(--muted);margin:10px 0 0;font-size:14px;line-height:1.5}.w3-intro-section{background:#d9eee1;padding:48px 24px}.w3-intro-section h3{margin:0 0 24px;font-size:38px;font-weight:400;line-height:1.2}.w3-columns{grid-template-columns:repeat(2,minmax(0,1fr));gap:48px;margin-top:28px;display:grid}.w3-columns h4{margin:0 0 12px;font-size:28px;font-weight:400}.w3-note-section{background:#ffc;padding:34px 24px}.lesson-example-card{background:#e7e9eb;border-radius:0;padding:26px 24px}.lesson-example-card h3{margin-top:0;font-size:28px;font-weight:400;line-height:1.2}.lesson-example-code{color:#1d1d1f;background:#fff;border-left:4px solid #21a366;margin:0 0 14px;padding:14px;font-size:17px;line-height:1.5;overflow:auto}.try-it-button{color:#fff;background:#04aa6d;border:1px solid #04aa6d;border-radius:8px;justify-content:center;align-items:center;padding:10px 16px;font-weight:700;display:inline-flex}.button-row.no-margin{margin-top:0}.step-footer{justify-content:space-between;align-items:center;gap:12px;margin-top:18px;padding-top:18px;display:flex}.step-progress{color:var(--muted);font-size:14px}.grid-two{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:16px;display:grid}.stacked-sections{gap:16px;margin-top:16px;display:grid}.table-wrap{max-width:100%;margin-top:14px;overflow:auto}.data-table{border-collapse:collapse;width:100%;min-width:980px;font-size:13px}.data-table th,.data-table td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;white-space:nowrap;padding:8px 10px}.data-table th{color:var(--accent-strong);font-weight:700}.table-details summary{color:var(--accent-strong);cursor:pointer;font-weight:700}.table-details dl{gap:6px;margin:8px 0 0;display:grid}.table-details dt{color:var(--muted);font-size:12px}.table-details dd{margin:2px 0 0}.feedback-section+.feedback-section,.feedback-section+.rating-panel,.rating-panel+.feedback-section{border-top:1px solid var(--border);margin-top:24px;padding-top:24px}.feedback-heading{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.feedback-section.standard-feedback,.feedback-section.tutor-feedback,.feedback-section.recommendation-panel{box-sizing:border-box;border-style:solid;border-width:1px;border-radius:8px;width:100%;padding:18px}.feedback-model{color:var(--muted);font-size:12px}.feedback-callout,.feedback-status,.rating-panel{border:1px solid var(--border);background:#f8f8f6;border-radius:8px;margin-top:18px;padding:16px}.feedback-callout pre{white-space:pre-wrap;overflow:auto}.feedback-tests{gap:12px;margin-top:18px;display:grid}.standard-task-grid{gap:14px;display:grid}.standard-task-card{border:1px solid var(--border);background:#fff;border-radius:8px;padding:16px}.standard-task-card h3{margin:0}.failed-test{border-left:3px solid var(--danger);background:#fbf4f3;padding:14px}.failed-test dl{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:0;display:grid}.failed-test dt{color:var(--muted);font-size:12px}.failed-test dd{overflow-wrap:anywhere;margin:4px 0 0;font-family:Consolas,Courier New,monospace}.rating-panel{gap:18px;display:grid}.rating-question{border:0;margin:0;padding:0}.rating-question legend{margin-bottom:10px;font-weight:700}.rating-scale{color:var(--muted);grid-template-columns:minmax(80px,1fr) auto minmax(80px,1fr);align-items:center;gap:12px;font-size:12px;display:grid}.rating-scale>span:last-child{text-align:right}.rating-options{gap:6px;display:flex}.rating-option{color:var(--foreground);display:block}.rating-option input{opacity:0;pointer-events:none;position:absolute}.rating-option span{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:8px;place-items:center;width:36px;height:36px;display:grid}.rating-option input:checked+span{border-color:var(--accent);background:var(--accent);color:#fff}.rating-panel.standard .rating-option input:checked+span{background:#1f7a68;border-color:#1f7a68}.rating-panel.its .rating-option input:checked+span{background:#3859b8;border-color:#3859b8}.feedback-complete{font-weight:700;color:var(--success)!important}.feedback-completion-actions{background:#f2fbf6;border:1px solid #b9dfcb;border-radius:8px;margin-top:18px;padding:16px}@media (max-width:820px){.lesson-panel>h2{font-size:34px}.w3-columns{grid-template-columns:1fr;gap:18px}.coding-top-layout,.coding-results-grid,.hint-comparison-pair,.coding-task-switcher{grid-template-columns:1fr}.coding-description-panel{height:auto;max-height:none}.coding-controls-row{justify-content:flex-start}.coding-hint-backdrop{justify-content:center}.coding-hint-drawer{border-left:0;width:100%;height:100%}.form-grid,.admin-code-form,.admin-generate-form,.admin-edit-modal .form-panel,.grid-two,.dashboard-layout{grid-template-columns:1fr}.admin-generate-form .wide-field{grid-column:auto}.topbar,.global-nav,.unit-header,.section-heading-row{flex-direction:column;align-items:flex-start}.dashboard-sidebar{order:-1}.user-menu-popover{left:0;right:auto}.failed-test dl,.rating-scale{grid-template-columns:1fr}.rating-scale>span:last-child{text-align:left}}