:root{color-scheme:dark;--font-text: "STIX Two Text", "STIX Two", "Times New Roman", Times, serif;--font-ui: "Source Sans 3", "Segoe UI", system-ui, -apple-system, sans-serif;--font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;--text-xs: .8125rem;--text-sm: .875rem;--text-ui: .9375rem;--text-read: clamp(1.0625rem, .92rem + .22vw, 1.1875rem);--text-read-sm: clamp(1rem, .89rem + .17vw, 1.09375rem);--text-title: 1.5rem;--bg-0: oklch(.16 .004 80);--bg-1: oklch(.2 .005 80);--bg-2: oklch(.24 .005 80);--bg-3: oklch(.28 .006 80);--bg-hover: oklch(.3 .006 80);--border: oklch(.32 .005 80);--border-strong: oklch(.5 .006 80);--line: var(--border);--surface-2: var(--bg-1);--text-0: oklch(.96 .004 80);--text-1: oklch(.82 .005 80);--text-2: oklch(.72 .006 80);--text-3: oklch(.64 .008 80);--accent: oklch(.86 .09 85);--accent-2: oklch(.78 .09 85);--accent-bg: oklch(.28 .045 85);--accent-fg: oklch(.15 .004 80);--good: oklch(.78 .1 145);--good-bg: oklch(.26 .045 145);--bad: oklch(.72 .13 30);--bad-bg: oklch(.28 .06 30);--warn: oklch(.82 .1 78);--warn-bg: oklch(.28 .05 78);--info: oklch(.76 .07 220);--info-bg: oklch(.27 .04 220);--heat-1: oklch(.29 .025 85);--heat-2: oklch(.42 .045 85);--heat-3: oklch(.62 .07 85);--scrim: rgba(0, 0, 0, .68);--radius: 0px;font-family:var(--font-ui);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}:root[data-theme=paper]{color-scheme:light;-webkit-font-smoothing:auto;--bg-0: oklch(.93 .016 85);--bg-1: oklch(.95 .012 85);--bg-2: oklch(.9 .018 85);--bg-3: oklch(.865 .02 85);--bg-hover: oklch(.89 .018 85);--border: oklch(.83 .018 80);--border-strong: oklch(.6 .02 75);--text-0: oklch(.24 .012 65);--text-1: oklch(.33 .012 65);--text-2: oklch(.42 .012 65);--text-3: oklch(.47 .012 65);--accent: oklch(.45 .13 258);--accent-2: oklch(.38 .12 258);--accent-bg: oklch(.89 .035 258);--accent-fg: oklch(.97 .01 85);--good: oklch(.46 .11 150);--good-bg: oklch(.9 .045 150);--bad: oklch(.49 .16 28);--bad-bg: oklch(.9 .035 28);--warn: oklch(.49 .1 70);--warn-bg: oklch(.9 .05 85);--info: oklch(.46 .09 230);--info-bg: oklch(.9 .03 230);--heat-1: oklch(.86 .03 258);--heat-2: oklch(.74 .06 258);--heat-3: oklch(.6 .1 258);--scrim: rgba(43, 34, 22, .42)}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg-0);color:var(--text-0);font-size:var(--text-ui);line-height:1.5}button,input,select,textarea{font:inherit}button{color:inherit}button:disabled{opacity:.45;cursor:not-allowed}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.mono{font-family:var(--font-mono);font-feature-settings:"zero"}.muted{color:var(--text-3)}.spacer{flex:1}.mobile-warning{display:none}.app-shell{display:grid;grid-template-columns:246px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;display:flex;flex-direction:column;gap:12px;height:100vh;padding:18px 14px;background:var(--bg-1);border-right:1px solid var(--border)}.brand-button,.user-tile,.course-card,.sidebar nav button{border:0;background:transparent;text-align:left}.brand-button{display:flex;align-items:center;gap:10px;padding:6px 8px 12px;cursor:pointer;font-weight:700}.brand-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--accent);color:var(--bg-0);font-weight:800}.course-card{position:relative;display:grid;gap:2px;padding:12px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-2);cursor:pointer}.course-card span,.course-card small,.brand-lockup span{color:var(--text-3);font-size:var(--text-xs)}.course-card strong{font-size:15px}.course-card svg{position:absolute;right:12px;top:14px;color:var(--text-3)}.sidebar nav{display:grid;gap:4px}.sidebar nav p{margin:12px 8px 4px;color:var(--text-3);font-size:var(--text-xs);font-weight:600}.sidebar nav button{display:flex;align-items:center;gap:10px;width:100%;padding:9px 10px;border-radius:8px;color:var(--text-1);cursor:pointer}.sidebar nav button:hover,.sidebar nav button.active{background:var(--bg-2);color:var(--text-0)}.nav-badge{margin-left:auto;padding:1px 7px;border-radius:999px;background:var(--bg-3);color:var(--text-2);font-size:var(--text-xs)}.user-tile{display:flex;align-items:center;gap:10px;margin-top:auto;padding:10px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-2);cursor:pointer}.user-tile span{display:grid;min-width:0}.user-tile small{color:var(--text-3)}.avatar{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--accent),oklch(.78 .12 250));color:var(--bg-0);font-weight:800}.avatar.large{width:68px;height:68px;border-radius:18px;font-size:22px}.main-shell{min-width:0}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:16px;height:60px;padding:0 28px;border-bottom:1px solid var(--border);background:color-mix(in oklch,var(--bg-0),transparent 7%);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.topbar h1{margin:1px 0 0;font-size:17px}.topbar-actions{display:flex;gap:8px;margin-left:auto}.content{width:100%;max-width:1240px;padding:28px 32px 42px}.content.wide{max-width:1440px}.content.narrow{max-width:1100px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:36px;padding:8px 13px;border:1px solid var(--border);border-radius:8px;background:var(--bg-2);color:var(--text-0);cursor:pointer;font-size:var(--text-sm);font-weight:650}.btn:hover:not(:disabled){background:var(--bg-3);border-color:var(--border-strong)}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--bg-0)}.btn.primary:hover:not(:disabled){background:var(--accent-2);border-color:var(--accent-2)}.btn.warn{background:var(--warn-bg);border-color:transparent;color:var(--warn)}.btn.danger{color:var(--bad)}.btn.small{min-height:30px;padding:5px 10px;font-size:var(--text-sm)}.btn.large{min-height:44px;padding:10px 16px}.btn.full{width:100%}.btn.icon{width:32px;padding:0}.hero-row,.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px}.hero-row h2,.section-head h2{margin:0;font-size:24px;letter-spacing:-.02em}.hero-row p,.section-head p{margin:5px 0 0;color:var(--text-2)}.stat-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:22px}.metric,.panel,.callout{border:1px solid var(--border);border-radius:12px;background:var(--bg-1)}.metric{display:grid;gap:4px;padding:18px}.metric strong{font-size:30px;letter-spacing:-.03em}.metric strong.accent{color:var(--accent)}.metric strong.good{color:var(--good)}.metric strong.warn{color:var(--warn)}.dashboard-grid,.upload-grid,.results-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:18px;margin-bottom:18px}.two-column{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:18px;align-items:start}.split-panels,.callout-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.panel h2,.panel h3{margin:0 0 14px;font-size:15px}.panel-inline{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.panel-inline h2,.panel-inline h3{margin:0}.sticky-panel{position:sticky;top:80px}.stack{display:grid;gap:10px}.gap-large{gap:18px}.button-row{display:flex;gap:8px;align-items:center}.button-row.wrap{flex-wrap:wrap}.bar-list{display:grid;gap:12px}.progress-row{display:grid;grid-template-columns:minmax(120px,1fr) minmax(140px,2fr) 44px;gap:12px;align-items:center;color:var(--text-1);font-size:var(--text-sm)}.progress-row:has(span:empty){grid-template-columns:1fr 44px}.progress{height:7px;overflow:hidden;border-radius:999px;background:var(--bg-3)}.progress i{display:block;height:100%;border-radius:inherit;background:var(--accent)}.progress i.good{background:var(--good)}.progress i.warn{background:var(--warn)}.progress i.bad{background:var(--bad)}.progress-row em{color:var(--text-3);font-style:normal;font-size:var(--text-sm);text-align:right}.callout{display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;padding:16px}.callout p{margin:2px 0 0;color:var(--text-3);font-size:var(--text-sm)}.callout-icon{display:grid;place-items:center;width:48px;height:48px;border-radius:12px}.callout-icon.accent{background:var(--accent-bg);color:var(--accent)}.callout-icon.warn{background:var(--warn-bg);color:var(--warn)}.chip{display:inline-flex;align-items:center;gap:5px;width:fit-content;padding:3px 8px;border-radius:999px;background:var(--bg-2);color:var(--text-1);font-size:var(--text-xs);font-weight:700;text-transform:capitalize}.chip.accent{background:var(--accent-bg);color:var(--accent)}.chip.good{background:var(--good-bg);color:var(--good)}.chip.bad,.chip.hard{background:var(--bad-bg);color:var(--bad)}.chip.warn,.chip.medium{background:var(--warn-bg);color:var(--warn)}.chip.easy{background:var(--good-bg);color:var(--good)}.choice-grid{display:grid;gap:10px}.choice-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.select-card,.chip-cloud button{border:1px solid var(--border);border-radius:10px;background:var(--bg-2);cursor:pointer}.select-card{display:grid;gap:5px;padding:14px;text-align:left}.select-card span{color:var(--text-3);font-size:var(--text-sm);line-height:1.45}.select-card.active,.chip-cloud button.active{border-color:var(--accent);background:var(--accent-bg);color:var(--accent)}.chip-cloud{display:flex;flex-wrap:wrap;gap:8px}.chip-cloud button{display:inline-flex;align-items:center;gap:6px;min-height:32px;padding:6px 11px;font-size:var(--text-sm)}.check-row{display:grid;grid-template-columns:42px minmax(0,1fr);gap:12px;align-items:center;padding:8px 0;color:var(--text-1);line-height:1.25}.check-row input[type=checkbox]{-moz-appearance:none;appearance:none;-webkit-appearance:none;display:grid;place-items:center;width:32px;height:32px;margin:0;border:1px solid var(--border-strong);border-radius:6px;background:var(--bg-2);cursor:pointer}.check-row input[type=checkbox]:after{content:"";width:15px;height:9px;border-left:4px solid transparent;border-bottom:4px solid transparent;transform:rotate(-45deg) translateY(-1px)}.check-row input[type=checkbox]:checked{border-color:#007dd6;border-color:oklch(.58 .19 250);background:#007dd6;background:oklch(.58 .19 250)}.check-row input[type=checkbox]:checked:after{border-color:#fff}.summary-line{display:flex;justify-content:space-between;padding:8px 0;color:var(--text-2)}.summary-line strong{color:var(--text-0)}.range-label{display:grid;gap:10px;margin:18px 0;color:var(--text-2);font-size:var(--text-sm)}.range-label span{color:var(--accent);font-weight:800}input[type=range]{width:100%;accent-color:var(--accent)}.filters{display:grid;grid-template-columns:minmax(240px,1fr) 180px 150px 150px;gap:10px;margin-bottom:16px}.search-box{position:relative}.search-box svg{position:absolute;left:12px;top:10px;color:var(--text-3)}input,select{width:100%;min-height:38px;border:1px solid var(--border);border-radius:8px;background:var(--bg-2);color:var(--text-0);padding:8px 11px}.search-box input{padding-left:36px}.table-panel{overflow:auto;padding:0}.padded{padding:0 18px 18px}.admin-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;padding:0 18px 14px}.admin-stats div{border:1px solid var(--line);border-radius:8px;padding:12px;background:var(--surface-2)}.admin-stats strong{display:block;font-size:22px}.admin-stats span{color:var(--text-2);font-size:var(--text-sm)}table{width:100%;border-collapse:collapse;min-width:720px}th,td{padding:13px 14px;border-bottom:1px solid var(--border);text-align:left;vertical-align:middle;font-size:var(--text-sm)}th{color:var(--text-3);font-size:var(--text-xs);font-weight:800;letter-spacing:.06em;text-transform:uppercase}tbody tr:hover{background:color-mix(in oklch,var(--bg-2),transparent 40%)}.click-row{cursor:pointer}.row-actions{display:inline-flex;gap:4px;align-items:center}.danger-icon{color:var(--bad)}.topic-chips{display:inline-flex;flex-wrap:wrap;gap:5px}.status-dot{display:inline-flex;align-items:center;gap:7px;color:var(--text-2);text-transform:capitalize}.dot,.status-dot i{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--text-3)}.dot.good,.status-dot i.correct{background:var(--good)}.dot.bad,.status-dot i.incorrect{background:var(--bad)}.status-dot i.flagged{background:var(--warn)}.status-dot i.unseen{background:var(--text-3)}.question-shell{display:grid;grid-template-rows:auto minmax(0,1fr) auto;height:100vh}.question-toolbar,.question-footer{display:flex;align-items:center;gap:10px;padding:12px 22px;border-bottom:1px solid var(--border);background:var(--bg-1)}.question-footer{border-top:1px solid var(--border);border-bottom:0}.question-count{font-weight:800}.question-count span,.timer,.shortcut-text{color:var(--text-3);font-size:var(--text-sm)}.timer{display:inline-flex;align-items:center;gap:6px;font-variant-numeric:tabular-nums}.question-layout{display:grid;grid-template-columns:minmax(0,1fr) 0;min-height:0;overflow:hidden}.question-body{width:100%;max-width:930px;margin:0 auto;padding:34px 42px;overflow:auto}.question-nav{overflow:auto;padding:16px;border-left:1px solid var(--border);background:var(--bg-1)}.nav-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.nav-grid button{aspect-ratio:1;border:1px solid var(--border);border-radius:8px;background:var(--bg-2);cursor:pointer;font-weight:800}.nav-grid button.active{border-color:var(--accent);color:var(--accent)}.nav-grid button.selected{background:var(--accent-bg);color:var(--accent)}.markdown{color:var(--text-0);font-size:16px;line-height:1.7}.markdown p{margin:0 0 15px}.study-sub,.study-sup{font-size:.72em;line-height:0}.study-sub{vertical-align:sub}.study-sup{vertical-align:super}.markdown pre{overflow:auto;padding:14px;border:1px solid var(--border);border-radius:10px;background:var(--bg-2);font-family:var(--font-mono);font-size:var(--text-sm)}.markdown blockquote{margin:0 0 15px;padding:10px 16px;border-left:3px solid var(--accent);border-radius:0 8px 8px 0;background:var(--bg-1);color:var(--text-1)}.answer-list{display:grid;gap:10px;margin-top:26px}.answer{position:relative;display:grid;grid-template-columns:28px 1fr auto;gap:12px;align-items:start;width:100%;padding:15px;border:1px solid var(--border);border-radius:12px;background:var(--bg-1);text-align:left;cursor:pointer}.answer>span{display:grid;place-items:center;width:25px;height:25px;border:1px solid var(--text-3);border-radius:50%;color:var(--text-2);font-size:var(--text-sm)}.answer strong{font-weight:500;line-height:1.55}.answer em{color:var(--text-3);font-size:var(--text-xs);font-style:normal;opacity:0}.answer:hover em{opacity:1}.answer.selected{border-color:var(--accent);background:var(--accent-bg)}.answer.selected>span{border-color:var(--accent);color:var(--accent)}.answer.correct{border-color:var(--good);background:var(--good-bg)}.answer.incorrect{border-color:var(--bad);background:var(--bad-bg)}.answer.struck strong{opacity:.45;text-decoration:line-through}.explanation{margin-top:24px;padding:20px;border:1px solid var(--border);border-radius:14px;background:var(--bg-1)}.explanation-head{display:flex;align-items:center;gap:12px;margin-bottom:12px}.explanation-head h3{margin:0;font-size:15px}.explanation h4{margin:18px 0 8px;color:var(--text-3);font-size:var(--text-xs);letter-spacing:.08em;text-transform:uppercase}.explanation-choices{display:grid;gap:8px}.explanation-choices div{display:grid;grid-template-columns:24px 1fr;gap:10px;padding:10px 12px;border-radius:8px;background:var(--bg-2)}.explanation-choices p{margin:0;color:var(--text-1)}.explanation-choices .good span{color:var(--good)}.reference{display:flex;align-items:center;gap:8px;margin-top:16px;color:var(--text-3);font-size:var(--text-sm)}.dropzone{display:grid;place-items:center;gap:8px;min-height:190px;padding:26px;border:1.5px dashed var(--border-strong);border-radius:12px;background:var(--bg-2);color:var(--text-2);cursor:pointer;text-align:center}.dropzone strong{color:var(--text-0)}.dropzone input{display:none}.validation{margin-top:12px;padding:12px;border-radius:10px;font-size:var(--text-sm)}.validation.good{background:var(--good-bg);color:var(--good)}.validation.bad{background:var(--bad-bg);color:var(--bad)}.code-sample{overflow:auto;max-height:370px;margin:0;padding:14px;border:1px solid var(--border);border-radius:10px;background:var(--bg-2);color:var(--text-1);font:var(--text-xs)/1.55 var(--font-mono)}.success-text{color:var(--good);font-size:var(--text-sm)}.error-text{color:var(--bad);font-size:var(--text-sm)}.review-list{padding:0}.review-list h3{padding:18px 18px 0}.review-row,.test-row,.question-card{display:grid;width:100%;border:0;border-bottom:1px solid var(--border);background:transparent;color:inherit;cursor:pointer;text-align:left}.review-row{grid-template-columns:34px 1fr auto;gap:12px;padding:14px 18px;align-items:start}.review-row span:nth-child(2){display:grid;gap:4px}.review-row small,.review-row em{color:var(--text-3);font-style:normal;font-size:var(--text-sm)}.result-icon{display:grid;place-items:center;width:28px;height:28px;border-radius:8px}.result-icon.good{background:var(--good-bg);color:var(--good)}.result-icon.bad{background:var(--bad-bg);color:var(--bad)}.score-card{text-align:center}.score-ring{--score: 0%;display:grid;place-items:center;width:160px;height:160px;margin:8px auto 16px;border-radius:50%;background:conic-gradient(var(--accent) var(--score),var(--bg-3) 0)}.score-ring span{display:grid;place-items:center;width:124px;height:124px;border-radius:50%;background:var(--bg-1);font-size:2.125rem;font-weight:800}.stat-pair{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.stat-pair span{display:grid;color:var(--text-3)}.stat-pair strong{color:var(--text-0);font-size:1.5rem}.trend{width:100%;height:220px;border-radius:10px;background:var(--bg-2)}.trend polyline{fill:none;stroke:var(--accent);stroke-width:3;vector-effect:non-scaling-stroke}.performance-distribution-panel{margin-bottom:18px}.distribution{display:grid;gap:12px}.distribution-summary{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.distribution-summary strong{color:var(--accent);font-family:var(--font-text);font-size:2.25rem;font-weight:500;font-variant-numeric:lining-nums tabular-nums}.distribution-summary span{color:var(--text-3);font-size:var(--text-sm)}.distribution-bar{display:flex;height:8px;overflow:hidden;background:var(--bg-3);border:1px solid var(--border)}.distribution-bar i{display:block;height:100%}.distribution-bar .good{background:var(--good)}.distribution-bar .bad{background:var(--bad)}.distribution p{display:flex;align-items:center;gap:7px;margin:0;color:var(--text-2)}.heatmap{display:grid;grid-template-columns:repeat(26,1fr);gap:3px}.heatmap span{aspect-ratio:1;border-radius:2px;background:var(--bg-2)}.heatmap .heat-1{background:#164545}.heatmap .heat-2{background:#196464}.heatmap .heat-3{background:#238b8b}.profile-panel{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center}.profile-panel h3{margin:0 0 4px;font-size:20px}.profile-panel p{margin:0 0 6px;color:var(--text-2)}.profile-panel span{display:inline-flex;align-items:center;gap:5px;color:var(--text-3);font-size:var(--text-sm)}.course-dot{--hue: 195;display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:oklch(.31 .06 var(--hue));color:oklch(.78 .13 var(--hue));font-size:var(--text-xs);font-weight:800}.question-card{grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:15px;border:1px solid var(--border);border-radius:12px;background:var(--bg-1)}.question-card span:nth-child(2){display:grid;gap:4px;color:var(--text-2)}.question-card svg{color:var(--warn)}.test-row{grid-template-columns:1fr auto auto;gap:10px;align-items:center;padding:10px 0}.test-row span:first-child{display:grid;gap:2px}.test-row small{color:var(--text-3)}.auth-shell{display:grid;place-items:center;min-height:100vh;padding:24px;background:radial-gradient(circle at 22% 20%,oklch(.32 .06 195 / .45),transparent 34%),radial-gradient(circle at 80% 82%,oklch(.3 .055 250 / .38),transparent 34%),var(--bg-0)}.auth-card{display:grid;gap:14px;width:min(440px,100%);padding:30px;border:1px solid var(--border);border-radius:16px;background:var(--bg-1)}.auth-card.wide{width:min(980px,100%)}.auth-card h1{margin:0;font-size:24px;letter-spacing:-.02em}.auth-card p{margin:0;color:var(--text-2);line-height:1.5}.auth-card label{display:grid;gap:6px;color:var(--text-2);font-size:var(--text-sm);font-weight:650}.auth-form{display:grid;gap:14px}.brand-lockup{display:flex;align-items:center;gap:12px;margin-bottom:6px}.brand-lockup div:last-child{display:grid;gap:2px}.auth-tabs{display:grid;grid-template-columns:repeat(2,1fr);gap:4px;padding:4px;border-radius:10px;background:var(--bg-2)}.auth-tabs button{min-height:34px;border:0;border-radius:7px;background:transparent;cursor:pointer;color:var(--text-2);font-weight:700}.auth-tabs button.active{background:var(--bg-3);color:var(--text-0)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:grid;place-items:center;padding:24px;background:#00000094;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal{width:min(560px,100%);padding:22px;border:1px solid var(--border);border-radius:16px;background:var(--bg-1);box-shadow:0 20px 70px #00000059}.modal.question-preview{width:min(820px,100%)}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}.preview-scroll{display:grid;gap:14px;max-height:min(68vh,720px);overflow:auto;padding-right:6px}.preview-choices{display:grid;gap:8px}.preview-choices div{display:grid;grid-template-columns:28px 1fr;gap:10px;padding:11px 12px;border:1px solid var(--border);border-radius:10px;background:var(--bg-2)}.preview-choices div.good{border-color:var(--good);background:var(--good-bg)}.preview-choices span{color:var(--text-2)}.preview-choices div.good span{color:var(--good)}.explanation.compact{margin-top:0}.tutor-submit-actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}.teaching{max-width:78ch}.teaching section{margin-top:24px}.explanation .teaching h4{color:var(--text-1);font-size:var(--text-ui);font-weight:600;letter-spacing:0;text-transform:none}.teaching .markdown{font-size:var(--text-read-sm);line-height:1.6;overflow-wrap:anywhere}.teaching ol{padding-left:26px}.teaching li{padding-left:8px;margin:12px 0}.teaching .self-check{padding:18px 20px;background:var(--bg-2);border:1px solid var(--border)}.teaching summary{cursor:pointer;padding:10px 0;font-weight:600;color:var(--accent)}.teaching summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.unknown-result{color:var(--text-1);line-height:1.6}.answer:disabled{opacity:1;cursor:default}@media(max-width:700px){.tutor-submit-actions{width:100%}.tutor-submit-actions .btn{flex:1 1 180px}}.course-option{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;width:100%;padding:13px;border:1px solid var(--border);border-radius:12px;background:var(--bg-2);cursor:pointer;text-align:left}.course-option.active{border-color:var(--accent);background:var(--accent-bg)}.course-option span:nth-child(2){display:grid;gap:3px}.course-option em{color:var(--text-3);font-style:normal;font-size:var(--text-sm)}.course-option.dashed{display:flex;justify-content:center;border-style:dashed;color:var(--text-2)}.empty-state{display:grid;place-items:center;gap:8px;min-height:140px;color:var(--text-3);text-align:center}::selection{background:var(--accent);color:var(--accent-fg)}:where(.brand-mark,.avatar,.avatar.large,.course-card,.user-tile,.btn,.metric,.panel,.callout,.callout-icon,.chip,.select-card,.chip-cloud button,.check-row input[type=checkbox],input,select,textarea,.progress,.progress i,.nav-badge,.question-toolbar,.question-footer,.nav-grid button,.markdown pre,.markdown blockquote,.answer,.answer>span,.explanation,.explanation-choices div,.dropzone,.validation,.code-sample,.result-icon,.trend,.heatmap span,.course-dot,.question-card,.auth-card,.auth-tabs,.auth-tabs button,.modal,.preview-choices div,.course-option,.score-ring,.score-ring span){border-radius:0!important;box-shadow:none!important}.app-shell{grid-template-columns:232px minmax(0,1fr);background:var(--bg-0)}.sidebar{gap:2px;padding:18px 0 14px;background:var(--bg-0);border-right-color:var(--border)}.brand-button{gap:10px;padding:4px 18px 16px;color:var(--text-0);font-family:var(--font-text);font-size:1.125rem;font-weight:600}.brand-mark{width:22px;height:22px;background:transparent;border:1px solid var(--text-0);color:var(--text-0);font-family:var(--font-text);font-size:var(--text-ui);font-weight:600}.course-card{margin:0 14px 14px;padding:10px 12px;background:transparent;border-color:var(--border)}.course-card:hover,.user-tile:hover{background:var(--bg-1);border-color:var(--border-strong)}.course-card span,.course-card small,.brand-lockup span{color:var(--text-3);font-size:var(--text-xs);font-weight:400}.course-card strong{margin-top:3px;color:var(--text-0);font-size:var(--text-ui);font-weight:600}.sidebar nav{gap:0}.sidebar nav p{margin:14px 18px 6px;color:var(--text-3);font-size:var(--text-xs);font-weight:600}.sidebar nav button{gap:12px;padding:8px 18px;border-left:2px solid transparent;color:var(--text-1);font-size:var(--text-ui);line-height:1.25}.sidebar nav button:hover,.sidebar nav button.active{background:var(--bg-1);color:var(--text-0)}.sidebar nav button.active{border-left-color:var(--accent)}.nav-badge{padding:0 6px;background:transparent;border:1px solid var(--border);color:var(--text-2);font-size:var(--text-xs);line-height:18px;font-variant-numeric:tabular-nums}.user-tile{margin:auto 14px 0;padding:10px 12px;background:transparent;border-color:var(--border)}.user-tile strong,.brand-lockup strong{font-weight:500}.user-tile small{color:var(--text-3);font-size:var(--text-xs)}.avatar{width:28px;height:28px;background:var(--bg-2);border:1px solid var(--border-strong);color:var(--text-0);font-size:var(--text-xs);font-weight:500}.avatar.large{width:64px;height:64px;font-size:20px}.topbar{height:52px;padding:0 24px;background:var(--bg-0);border-bottom-color:var(--border);-webkit-backdrop-filter:none;backdrop-filter:none}.topbar h1{font-family:var(--font-text);font-size:1.25rem;font-weight:600;line-height:1.2}.topbar span{color:var(--text-3);font-size:var(--text-sm)}.topbar-actions{gap:6px}.content{max-width:1280px;padding:24px 28px 42px}.content.wide{max-width:none}.btn{min-height:34px;padding:7px 13px;background:transparent;border-color:var(--border-strong);color:var(--text-0);font-size:var(--text-sm);font-weight:500;letter-spacing:0;transition:background .1s,border-color .1s,color .1s}.btn:hover:not(:disabled){background:var(--bg-2);border-color:var(--text-2)}.btn.primary{background:var(--text-0);border-color:var(--text-0);color:var(--bg-0);font-weight:600}.btn.primary:hover:not(:disabled){background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}.btn.ghost{background:transparent;border-color:transparent;color:var(--text-1)}.btn.ghost:hover:not(:disabled){background:var(--bg-2);border-color:transparent;color:var(--text-0)}.btn.warn{background:transparent;border-color:var(--warn);color:var(--warn)}.btn.danger,.danger-icon{background:transparent;color:var(--bad)}.btn.danger:hover:not(:disabled){background:transparent;border-color:var(--bad)}.btn.small{min-height:28px;padding:4px 9px;font-size:var(--text-xs)}.btn.large{min-height:40px;padding:9px 16px;font-size:var(--text-ui)}.btn.icon{width:30px}.hero-row,.section-head{align-items:flex-end;margin-bottom:22px}.hero-row h2,.section-head h2{font-family:var(--font-text);font-size:var(--text-title);font-weight:600;letter-spacing:0}.hero-row p,.section-head p{color:var(--text-2);font-size:var(--text-ui)}.stat-grid{gap:0;margin-bottom:28px}.metric{gap:6px;min-height:126px;padding:18px;background:var(--bg-1);border-color:var(--border);border-right-width:0}.metric:last-child{border-right-width:1px}.metric span,.metric small{color:var(--text-3);font-size:var(--text-sm)}.metric span{color:var(--text-2);font-weight:600}.metric strong{font-family:var(--font-text);font-size:2.25rem;font-weight:500;font-variant-numeric:lining-nums tabular-nums;letter-spacing:0;line-height:1.1}.dashboard-grid,.upload-grid,.results-grid{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:18px}.panel,.callout{min-width:0;background:var(--bg-1);border-color:var(--border)}.panel{padding:18px}.panel h2,.panel h3{font-family:var(--font-text);font-size:1.125rem;font-weight:600}.panel-inline h2,.panel-inline h3,.table-panel h3{margin:0}.table-panel h3{padding:18px 18px 0}.callout{padding:16px}.callout p{color:var(--text-3);font-size:var(--text-sm)}.callout-icon{width:42px;height:42px;background:transparent;border:1px solid currentColor}.callout-icon.accent{color:var(--accent)}.callout-icon.warn{color:var(--warn)}.chip{gap:6px;padding:2px 7px;background:transparent;border:1px solid var(--border-strong);color:var(--text-1);font-size:var(--text-xs);font-weight:600;line-height:1.5;text-transform:none}.chip.easy,.chip.medium,.chip.hard{text-transform:capitalize}.chip.accent{background:transparent;border-color:var(--accent);color:var(--accent)}.chip.good,.chip.easy{background:transparent;border-color:var(--good);color:var(--good)}.chip.bad,.chip.hard{background:transparent;border-color:var(--bad);color:var(--bad)}.chip.warn,.chip.medium{background:transparent;border-color:var(--warn);color:var(--warn)}.progress{height:2px;background:var(--bg-3)}.progress i{background:var(--accent)}.progress-row{grid-template-columns:minmax(150px,1fr) minmax(180px,2fr) 44px;font-size:var(--text-sm)}.progress-row em{font-size:var(--text-sm);font-variant-numeric:tabular-nums}.difficulty-row{display:grid;gap:10px;padding:14px 0;border-top:1px solid var(--border)}.difficulty-row:first-child{padding-top:0;border-top:0}.difficulty-row:last-child{padding-bottom:0}.difficulty-row__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.difficulty-row__head strong{font-size:var(--text-sm);font-weight:600;text-transform:capitalize}.difficulty-row__head em,.difficulty-row small{color:var(--text-3);font-size:var(--text-sm);font-style:normal}.difficulty-bar{display:flex;width:100%;height:6px;overflow:hidden;background:var(--bg-3);border:1px solid var(--border)}.difficulty-bar i{display:block;height:100%}.difficulty-bar .good{background:var(--good)}.difficulty-bar .bad{background:var(--bad)}.difficulty-bar .neutral{background:var(--bg-3)}.select-card,.chip-cloud button{background:transparent;border-color:var(--border-strong)}.select-card{padding:14px}.select-card:hover,.chip-cloud button:hover{background:var(--bg-2)}.select-card.active,.chip-cloud button.active{background:var(--accent-bg);border-color:var(--accent);color:var(--text-0)}.select-card.active span,.chip-cloud button.active span{color:var(--text-2)}.check-row{position:relative;color:var(--text-1);display:flex;align-items:center;gap:14px}.check-box{display:inline-grid;place-items:center;flex:0 0 auto;width:22px;height:22px;border:1px solid var(--border-strong);background:transparent}.check-row input[type=checkbox]:checked+.check-box{background:var(--text-0);border-color:var(--text-0)}.check-row input[type=checkbox]:checked+.check-box:after{content:"";width:6px;height:11px;border-right:2px solid var(--bg-0);border-bottom:2px solid var(--bg-0);transform:rotate(45deg) translateY(-1px)}.range-label{color:var(--text-2);font-size:var(--text-sm)}.range-label span{color:var(--accent)}input,select,textarea{min-height:36px;background:var(--bg-1);border-color:var(--border-strong);color:var(--text-0);font-size:var(--text-ui)}input::placeholder,textarea::placeholder{color:var(--text-3)}.check-row input[type=checkbox]{position:absolute;width:1px;height:1px;min-height:1px;margin:0;opacity:0;pointer-events:none}.check-row input[type=checkbox]:focus-visible+.check-box{outline:2px solid var(--accent);outline-offset:2px}.search-box svg{color:var(--text-3)}.filters{background:transparent}table{border-collapse:collapse}th,td{padding:10px 14px;border-bottom-color:var(--border);font-size:var(--text-sm)}th{background:transparent;border-bottom:1px solid var(--border-strong);color:var(--text-2);font-size:var(--text-xs);font-weight:600;letter-spacing:0;text-transform:none}tbody tr:hover{background:var(--bg-1)}.admin-stats div{background:transparent;border-color:var(--border)}.admin-stats strong{font-family:var(--font-text);font-weight:500}.activity-toggle{display:inline-flex;border:1px solid var(--border)}.activity-toggle button{min-height:30px;padding:0 10px;background:transparent;border:0;border-right:1px solid var(--border);color:var(--text-3);cursor:pointer;font-size:var(--text-xs);font-weight:600}.activity-toggle button:last-child{border-right:0}.activity-toggle button.active{background:var(--text-0);color:var(--bg-0)}.question-shell{background:var(--bg-0)}.question-toolbar,.question-footer{padding:10px 24px;background:var(--bg-0);border-color:var(--border)}.question-count{font-size:var(--text-ui);font-weight:600;font-variant-numeric:tabular-nums}.timer,.shortcut-text{color:var(--text-3);font-variant-numeric:tabular-nums}.question-layout.with-nav{grid-template-columns:minmax(0,1fr) 286px}.question-body{max-width:46rem;padding:32px 48px}.question-nav{background:var(--bg-0);border-left-color:var(--border)}.nav-grid{gap:0}.nav-grid button{background:transparent;border-color:var(--border);color:var(--text-1);font-size:var(--text-sm);font-weight:600;font-variant-numeric:tabular-nums}.nav-grid button+button{margin-left:-1px}.nav-grid button.active,.nav-grid button.selected{background:var(--bg-2);color:var(--accent);border-color:var(--accent)}.nav-grid button.done{background:var(--good-bg);color:var(--good)}.markdown{color:var(--text-0);font-family:var(--font-text);font-size:var(--text-read);line-height:1.6}.markdown pre{background:var(--bg-1);font-family:var(--font-mono);line-height:1.5}.markdown blockquote{background:var(--bg-1)}.answer-list{gap:0;margin-top:28px}.answer{grid-template-columns:28px 1fr auto;gap:14px;padding:14px 18px;background:var(--bg-1);border-color:var(--border);border-top-width:0}.answer:first-child{border-top-width:1px}.answer:hover{background:var(--bg-2)}.answer>span{width:26px;height:26px;border-color:var(--text-3);color:var(--text-1);font-family:var(--font-text);font-size:var(--text-ui);font-weight:600}.answer strong{font-family:var(--font-text);font-size:var(--text-read);font-weight:400;line-height:1.5}.answer.selected,.answer.correct,.answer.incorrect{border-top-width:1px;margin-top:-1px;position:relative;z-index:1}.answer.selected{background:var(--bg-2);border-color:var(--accent)}.answer.correct{background:var(--good-bg);border-color:var(--good)}.answer.incorrect{background:var(--bad-bg);border-color:var(--bad)}.answer.correct>span{background:var(--good);border-color:var(--good);color:var(--bg-0)}.answer.incorrect>span{background:var(--bad);border-color:var(--bad);color:var(--bg-0)}.explanation{margin-top:32px;padding:22px 24px;background:var(--bg-1)}.explanation-head{padding-bottom:14px;border-bottom:1px solid var(--border)}.explanation-head h3,.explanation h4{letter-spacing:0;text-transform:none}.explanation-head h3{font-family:var(--font-text);font-size:1.125rem;font-weight:600}.explanation h4{color:var(--text-2);font-size:var(--text-sm);font-weight:600}.explanation .markdown,.explanation-choices p{font-size:var(--text-read-sm)}.explanation-choices p{font-family:var(--font-text);line-height:1.55}.explanation-choices div{background:var(--bg-2);border-left:2px solid transparent}.explanation-choices .good{border-left-color:var(--good)}.dropzone{background:transparent;border:1px dashed var(--border-strong)}.dropzone:hover{border-color:var(--accent);color:var(--text-1)}.validation.good,.validation.bad{background:transparent;border:1px solid currentColor}.code-sample{background:var(--bg-0);font-family:var(--font-mono)}.success-text,.error-text{font-size:var(--text-sm)}.review-row,.test-row,.question-card{background:transparent}.review-row:hover,.test-row:hover,.question-card:hover{background:var(--bg-1)}.result-icon{background:transparent;border:1px solid currentColor}.score-card{text-align:left}.score-ring{border:1px solid var(--border-strong);display:grid;place-items:center;overflow:hidden}.score-ring span{background:var(--bg-1);font-family:var(--font-text);font-weight:500;font-variant-numeric:lining-nums tabular-nums}.score-ring .reel{align-items:center;justify-content:center}.stat-pair strong{font-family:var(--font-text);font-weight:500;font-variant-numeric:lining-nums tabular-nums}.trend{background:var(--bg-1);border:1px solid var(--border)}.trend polyline{stroke:var(--accent);stroke-width:2}.heatmap{gap:2px}.heatmap span{border:1px solid var(--bg-0)}.heatmap .heat-1{background:var(--heat-1)}.heatmap .heat-2{background:var(--heat-2)}.heatmap .heat-3{background:var(--heat-3)}.heatmap .heat-4{background:var(--accent)}.profile-panel h3{font-family:var(--font-text);font-size:1.25rem;font-weight:600}.course-dot{background:transparent;border:1px solid var(--border-strong);color:var(--accent)}.auth-shell{background:var(--bg-0)}.auth-card{background:var(--bg-0);border-color:var(--border-strong)}.auth-card h1{font-family:var(--font-text);font-size:1.625rem;font-weight:600;letter-spacing:0}.auth-card label{color:var(--text-2);font-size:var(--text-sm);font-weight:600}.auth-tabs{display:flex;gap:0;padding:0;background:transparent;border-bottom:1px solid var(--border)}.auth-tabs button{flex:1;min-height:36px;border-bottom:2px solid transparent;color:var(--text-3);font-size:var(--text-ui);font-weight:600}.auth-tabs button.active{background:transparent;border-bottom-color:var(--accent);color:var(--text-0)}.modal-backdrop{background:var(--scrim);-webkit-backdrop-filter:none;backdrop-filter:none}.modal{background:var(--bg-1);border-color:var(--border-strong)}.preview-choices{gap:0}.preview-choices div{background:var(--bg-2);border-top-width:0}.preview-choices div:first-child{border-top-width:1px}.course-option{background:transparent;border-color:var(--border)}.course-option:hover,.course-option.active{background:var(--bg-1)}.course-option.active{border-color:var(--accent)}.course-option.dashed{border-color:var(--border-strong)}.empty-state{color:var(--text-3)}.reel{display:inline-block;font-variant-numeric:tabular-nums;line-height:1;white-space:nowrap}.metric strong .reel,.metric strong .reel *,.score-ring .reel,.score-ring .reel *,.stat-pair .reel,.stat-pair .reel *{background:transparent;color:inherit;font-family:inherit;font-size:inherit;font-style:inherit;font-variant-numeric:tabular-nums;font-weight:inherit;letter-spacing:inherit;line-height:1;text-transform:none}@keyframes sb-answer-pulse{0%{opacity:.9;transform:scale(.995)}to{opacity:0;transform:scale(1.035)}}.answer.correct:after{content:"";position:absolute;top:-1px;right:-1px;bottom:-1px;left:-1px;border:1px solid var(--good);pointer-events:none;animation:sb-answer-pulse .95s ease-out 1}.question-layout{transition:grid-template-columns .2s cubic-bezier(.16,1,.3,1)}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.001ms!important}}@media(max-width:1120px){.hero-row,.section-head{align-items:stretch;flex-wrap:wrap}.hero-row>div,.section-head>div{min-width:min(100%,360px)}.hero-row>.btn{margin-left:auto}.stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.metric:nth-child(2n){border-right-width:1px}.dashboard-grid,.upload-grid,.results-grid{grid-template-columns:1fr}}@media(max-width:980px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--border)}.sidebar nav{grid-template-columns:repeat(2,minmax(0,1fr))}.sidebar nav p{grid-column:1 / -1}.user-tile{margin-top:8px}.topbar{top:0}.stat-grid,.dashboard-grid,.upload-grid,.results-grid,.two-column,.split-panels,.callout-grid{grid-template-columns:1fr}.sticky-panel{position:static}.filters,.question-layout.with-nav,.question-layout{grid-template-columns:1fr}.question-nav{display:none}}@media(max-width:640px){body{padding-top:42px}.mobile-warning{position:fixed;top:0;left:0;right:0;z-index:1000;display:block;padding:10px 14px;border-bottom:1px solid color-mix(in oklch,var(--warn),transparent 55%);background:var(--warn-bg);color:var(--warn);font-size:var(--text-sm);font-weight:750;text-align:center}.content{padding:20px 16px 34px}.hero-row,.section-head,.topbar,.question-toolbar,.question-footer{align-items:stretch;flex-direction:column}.topbar{height:auto;padding:10px 16px}.topbar-actions,.button-row{width:100%}.topbar-actions .btn,.button-row .btn{flex:1}.question-body{padding:24px 16px}.question-footer .btn{width:100%}.shortcut-text{display:none}.choice-grid.two{grid-template-columns:1fr}.profile-panel{grid-template-columns:1fr;text-align:left}.progress-row,.callout{grid-template-columns:1fr}}.free-response{display:grid;gap:8px;margin-top:22px}.free-response textarea{width:100%;min-height:180px;resize:vertical;padding:14px;border-radius:10px;border:1px solid var(--border-strong);background:var(--bg-1);color:inherit;font:inherit;font-family:var(--font-text);font-size:var(--text-read-sm);line-height:1.55}.free-response textarea:disabled{opacity:.85}.free-meta{color:var(--text-2);font-size:var(--text-sm)}.grade-pending{line-height:1.6;padding:12px 14px;border-radius:10px;background:var(--info-bg)}.grade-error{color:var(--bad);line-height:1.6;display:grid;gap:8px;justify-items:start}.grade-feedback ul,.explanation ul{margin:6px 0 12px 18px;line-height:1.6}.question-layout.with-chat{grid-template-columns:minmax(0,1fr) minmax(340px,440px)}.question-layout.with-chat.with-nav{grid-template-columns:minmax(0,1fr) 286px minmax(340px,440px)}.tutor-chat{display:grid;grid-template-rows:auto minmax(0,1fr) auto;min-height:0;border-left:1px solid var(--border);background:var(--bg-1)}.tutor-head{display:flex;align-items:center;gap:10px;padding:12px 14px;border-bottom:1px solid var(--border);color:var(--accent)}.tutor-head h3{margin:0;color:var(--text-0);font-size:var(--text-ui)}.tutor-head small{display:block;color:var(--text-3);font-size:var(--text-xs);line-height:1.4}.tutor-head .spacer{flex:1}.tutor-messages{display:flex;flex-direction:column;gap:12px;min-height:0;overflow:auto;padding:16px 14px}.tutor-empty p{margin:0 0 12px;color:var(--text-2);font-size:var(--text-sm);line-height:1.6}.tutor-suggestions{display:grid;gap:6px}.tutor-suggestions button{padding:8px 10px;border:1px solid var(--border);background:transparent;color:var(--text-1);font:inherit;font-size:var(--text-sm);text-align:left;cursor:pointer}.tutor-suggestions button:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.tutor-msg{padding:10px 12px;font-size:var(--text-ui);line-height:1.6;overflow-wrap:anywhere}.tutor-msg.user{align-self:flex-end;max-width:88%;background:var(--accent-bg);color:var(--text-0);white-space:pre-wrap}.tutor-msg.assistant{align-self:stretch;border:1px solid var(--border);background:var(--bg-2);color:var(--text-0);font-family:var(--font-text);font-size:var(--text-read-sm);line-height:1.55}.tutor-thinking{display:flex;align-items:center;gap:10px;color:var(--text-2);font-family:var(--font-ui);font-size:var(--text-sm)}.tutor-dots{display:inline-flex;gap:3px}.tutor-dots i{width:5px;height:5px;background:var(--accent);animation:tutor-blink 1.2s infinite ease-in-out}.tutor-dots i:nth-child(2){animation-delay:.2s}.tutor-dots i:nth-child(3){animation-delay:.4s}@keyframes tutor-blink{0%,80%,to{opacity:.2}40%{opacity:1}}.tutor-error{display:grid;gap:8px;justify-items:start;color:var(--bad);font-size:var(--text-sm);line-height:1.5}.chat-md p{margin:0 0 8px}.chat-md p:last-child,.chat-md ul:last-child,.chat-md ol:last-child{margin-bottom:0}.chat-md ul,.chat-md ol{margin:4px 0 8px;padding-left:20px}.chat-md li{margin:3px 0}.chat-md pre{margin:6px 0 10px;padding:8px 10px;background:var(--bg-0);font-family:var(--font-mono);font-size:var(--text-xs);white-space:pre-wrap}.chat-md code{padding:1px 4px;background:var(--bg-0);font-family:var(--font-mono);font-size:.85em}.tutor-form{display:grid;gap:6px;padding:12px 14px;border-top:1px solid var(--border)}.tutor-form textarea{min-height:70px;max-height:200px;padding:10px 12px;border:1px solid var(--border);background:var(--bg-0);color:inherit;font:inherit;font-size:var(--text-ui);line-height:1.5;resize:vertical}.tutor-form textarea:focus{outline:none;border-color:var(--accent)}.tutor-form-row{display:flex;align-items:center;justify-content:space-between;gap:8px;color:var(--text-3);font-size:var(--text-xs)}@media(max-width:980px){.question-layout.with-chat,.question-layout.with-chat.with-nav{grid-template-columns:1fr}.tutor-chat{position:fixed;top:0;right:0;bottom:0;z-index:60;width:min(100%,440px)}}@media(max-width:640px){.tutor-chat{top:42px}}
