:root{--primary: #2563eb;--primary-hover: #1d4ed8;--bg: #f8fafc;--surface: #ffffff;--text: #1e293b;--muted: #475569;--border: #e2e8f0;--focus: #2563eb;--mark: #cc202a;--warning: #92400e;--radius: 8px;--s1: 8px;--s2: 12px;--s3: 16px;--s4: 24px;--s5: 32px;--shadow: 0 1px 2px rgba(15, 23, 42, .06);color:var(--text);background:var(--bg);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.5;font-synthesis:none}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text)}body{overflow-x:hidden;overflow-wrap:break-word}h1,h2,h3,h4,p{margin:0}h1{font-size:1.75rem;line-height:1.25;letter-spacing:-.02em}h2{font-size:1.25rem;line-height:1.3}h3{font-size:1rem;line-height:1.4}a{color:var(--primary);text-underline-offset:2px}a:hover{color:var(--primary-hover)}:focus-visible{outline:2px solid 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var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text)}.input:hover,.select:hover,.textarea:hover{border-color:#cbd5e1}.textarea{min-height:120px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.875rem}.inline-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s3)}.segmented{display:flex;flex-wrap:wrap;gap:var(--s1);padding:4px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg)}.segmented label{display:inline-flex;align-items:center;min-height:44px;padding:0 var(--s3);border-radius:6px;cursor:pointer;font-weight:600}.segmented input{position:absolute;opacity:0;pointer-events:none}.segmented label:has(input:checked){background:var(--surface);box-shadow:var(--shadow)}.segmented label:has(input:focus-visible){outline:2px solid var(--focus);outline-offset:2px}.alert{padding:var(--s2) var(--s3);border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text)}.alert-warning,.alert-error{border-color:#fcd34d;background:#fffbeb;color:var(--warning);font-weight:600}.error-text{color:var(--warning);font-size:.875rem;font-weight:600}.field-error{margin-top:4px}.badge{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border:1px solid var(--border);border-radius:999px;background:var(--bg);color:var(--muted);font-size:.8125rem;font-weight:600}.badge-primary{border-color:#bfdbfe;background:#eff6ff;color:#1e40af}.list{list-style:none;margin:0;padding:0}.list-item{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--s2);padding:var(--s3) var(--s4);border-bottom:1px solid var(--border)}.list-item:last-child{border-bottom:0}.list-item-main{min-width:0}.list-item-main a{display:inline-flex;align-items:center;min-height:44px}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.empty{padding:var(--s4);color:var(--muted);text-align:center}.tabular{font-variant-numeric:tabular-nums}.loading{display:inline-flex;align-items:center;gap:var(--s1);color:var(--muted)}.spinner{width:16px;height:16px;border:2px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.topbar{position:sticky;top:0;z-index:20;border-bottom:1px solid var(--border);background:var(--surface)}.topbar-inner{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s3);width:100%;max-width:1240px;margin:0 auto;padding:var(--s2) var(--s4)}.brand{display:inline-flex;align-items:center;gap:var(--s1);min-height:44px;color:var(--text);font-weight:700;letter-spacing:-.01em;text-decoration:none}.brand-mark{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:6px;background:var(--primary);color:#fff;font-size:.875rem}.nav{display:flex;flex-wrap:wrap;align-items:center;gap:4px}.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 var(--s2);border-radius:6px;color:var(--muted);font-weight:600;text-decoration:none}.nav a:hover{background:var(--bg);color:var(--text)}.nav a.active{background:#eff6ff;color:#1e40af}.nav-spacer{flex:1 1 auto}.user-chip{display:inline-flex;align-items:center;min-height:44px;color:var(--muted);font-size:.875rem}.login-wrap{display:grid;place-items:center;min-height:100vh;padding:var(--s4)}.login-card{width:100%;max-width:460px}.login-brand{margin-bottom:var(--s3)}.tabs{display:flex;gap:4px;padding:4px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg)}.tabs button{flex:1 1 0;min-height:44px;border:0;border-radius:6px;background:transparent;color:var(--muted);font-weight:600}.tabs button.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}.stat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--s3)}.stat{padding:var(--s4);border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}.stat-label{color:var(--muted);font-size:.875rem;font-weight:600}.stat-value{margin-top:var(--s1);font-size:1.75rem;font-weight:700;font-variant-numeric:tabular-nums}.progress-track{height:8px;overflow:hidden;border-radius:999px;background:var(--border)}.progress-fill{height:100%;border-radius:inherit;background:var(--primary)}.criteria-pre{overflow:auto;max-height:320px;margin:0;padding:var(--s3);border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);font-size:.8125rem;white-space:pre-wrap;overflow-wrap:anywhere}.file-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--s3)}.file-slot{display:flex;flex-direction:column;gap:6px;padding:var(--s3);border:1px dashed #cbd5e1;border-radius:var(--radius);background:var(--bg)}.file-name{color:var(--muted);font-size:.8125rem;overflow-wrap:anywhere}.grading{display:grid;grid-template-columns:250px minmax(0,1fr) 360px;gap:var(--s3);align-items:start}.grading-col{min-width:0}.sub-list{max-height:640px;overflow:auto}.sub-button{display:block;width:100%;min-height:44px;padding:var(--s2) var(--s3);border:0;border-bottom:1px solid var(--border);background:transparent;text-align:left}.sub-button:hover{background:var(--bg)}.sub-button.active{background:#eff6ff}.sub-button strong{display:block}.page-viewer{position:relative;width:100%;min-height:560px;margin:0 auto;border:1px solid var(--border);border-radius:var(--radius);background:#fff;box-shadow:0 8px 24px #0f172a14;overflow:hidden}.page-total{position:absolute;top:var(--s3);right:var(--s3);color:var(--mark);font-size:1.25rem;font-weight:700;font-variant-numeric:tabular-nums}.page-total-label{position:absolute;top:calc(var(--s3) + 28px);right:var(--s3);color:var(--mark);font-size:.75rem;font-weight:600}.page-lines{position:absolute;inset:72px var(--s4) var(--s4);background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 27px,#eef2f7 27px,#eef2f7 28px);pointer-events:none}.annotation{position:absolute;display:flex;align-items:flex-start;justify-content:flex-start;padding:2px 4px;border:2px solid var(--mark);border-radius:3px;background:#cc202a14;color:var(--mark);font-size:.6875rem;font-weight:700;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.mark-list{display:flex;flex-direction:column;gap:var(--s1);margin:var(--s2) 0 0;padding:0;list-style:none}.mark-list li{display:flex;align-items:baseline;gap:var(--s1)}.mark-swatch{flex:0 0 auto;width:12px;height:12px;margin-top:4px;border:2px solid var(--mark);border-radius:2px;background:#cc202a14}.mark-text{color:var(--mark);font-weight:600}.mark-correct{color:var(--muted);font-weight:600}.question-block{padding:var(--s3) 0;border-bottom:1px solid var(--border)}.question-block:last-child{border-bottom:0}.score-row{display:grid;grid-template-columns:minmax(0,1fr) 110px;gap:var(--s2);align-items:end}.total-line{display:flex;align-items:baseline;justify-content:space-between;gap:var(--s2);padding-top:var(--s3);border-top:1px solid var(--border)}.total-red{color:var(--mark);font-size:1.5rem;font-weight:700;font-variant-numeric:tabular-nums}.result-question{padding:var(--s3) 0;border-bottom:1px solid var(--border)}.result-question:last-child{border-bottom:0}.tool-form{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:var(--s2);align-items:end}.checklist{margin:0;padding-left:var(--s4)}.checklist li{margin-bottom:4px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}@media(max-width:900px){.page{padding:var(--s4) var(--s3)}.grading,.grid-2,.grid-3,.stat-grid,.inline-fields,.file-row{grid-template-columns:minmax(0,1fr)}.topbar-inner{padding:var(--s2) var(--s3)}.nav-spacer{display:none}.page-viewer{min-height:460px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}.spinner{animation:none}}.landing-header{position:sticky;top:0;z-index:30;border-bottom:1px solid var(--border);background:var(--surface)}.landing-header-inner{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s4);width:100%;max-width:1240px;margin:0 auto;padding:var(--s2) var(--s4)}.landing-nav{display:flex;flex-wrap:wrap;align-items:center;gap:4px}.landing-nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 var(--s2);border-radius:6px;color:var(--muted);font-weight:600;text-decoration:none}.landing-nav a:hover{background:var(--bg);color:var(--text)}.landing-header-actions{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s2);margin-left:auto}.landing-inner{width:100%;max-width:1240px;margin:0 auto;padding:0 var(--s4)}.landing-section{scroll-margin-top:96px;padding:72px 0}.landing-section-alt{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface)}.landing-heading{margin:0 0 var(--s4);font-size:clamp(1.6rem,3vw,2.125rem);line-height:1.2;letter-spacing:-.02em}.landing-hero{padding:72px 0 80px}.landing-hero-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:center;gap:48px}.landing-hero-copy{display:flex;flex-direction:column;gap:var(--s3)}.landing-hero-copy h1{margin:0;font-size:clamp(2rem,4.2vw,3rem);line-height:1.1;letter-spacing:-.03em}.landing-lead{max-width:56ch;color:var(--muted);font-size:1.0625rem;line-height:1.7}.landing-hero-actions{margin-top:var(--s1)}.landing-hero-media img{display:block;width:100%;height:auto;border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 12px 32px #0f172a1a}.landing-steps{display:grid;gap:var(--s3);margin:0;padding:0;list-style:none}.landing-steps li{display:grid;grid-template-columns:48px minmax(0,1fr);gap:var(--s3);align-items:start;padding:var(--s4);border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow)}.landing-step-num{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:999px;background:#eff6ff;color:var(--primary);font-size:1.0625rem;font-weight:700}.landing-steps h3{margin:0 0 4px;font-size:1.0625rem}.landing-steps p{margin:0;line-height:1.65}.landing-feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--s3)}.landing-feature{display:flex;flex-direction:column;gap:var(--s2);padding:var(--s4)}.landing-icon{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:8px;background:#eff6ff;color:var(--primary)}.landing-icon svg{width:22px;height:22px}.landing-feature h3,.landing-school-card h3{margin:0;font-size:1.0625rem}.landing-feature p,.landing-school-card p{margin:0;line-height:1.65}.landing-see-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);align-items:start;gap:48px}.landing-figure{margin:0}.landing-paper{min-height:340px;padding:var(--s5) 28px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:0 14px 36px #0f172a1a}.landing-paper-total{display:flex;justify-content:flex-end;margin-bottom:var(--s4);color:var(--mark);font-size:1.75rem;font-weight:700;font-variant-numeric:tabular-nums}.landing-paper-line{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s1);font-size:1.0625rem}.landing-check{width:22px;height:22px;color:var(--mark)}.landing-paper-correct{color:var(--muted);font-size:.875rem;font-weight:600}.landing-paper-question{margin-top:var(--s4);font-size:1.0625rem;font-weight:500}.landing-paper-answer{margin-top:var(--s2);font-size:1.0625rem;line-height:1.7}.landing-mark-box{display:inline-block;padding:0 4px;border:2px solid var(--mark);border-radius:3px;color:var(--text);font-weight:700;line-height:1.2}.landing-correction{margin-top:var(--s2);color:var(--mark);font-size:1.0625rem;font-weight:700}.landing-figure figcaption{margin-top:var(--s3);line-height:1.6}.landing-see-copy p{margin:0;font-size:1.0625rem;line-height:1.75}.landing-see-copy img{display:block;width:100%;height:auto;margin-top:var(--s4);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 12px 32px #0f172a14}.landing-privacy{max-width:960px;padding:var(--s5)}.landing-privacy .landing-heading{margin-bottom:var(--s3)}.landing-privacy p{margin:0;font-size:1.0625rem;line-height:1.75}.landing-school-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--s3)}.landing-school-card{padding:var(--s4)}.landing-school-card h3{margin-bottom:var(--s2)}.landing-faq-inner{max-width:900px}.landing-faq{display:grid;gap:var(--s2)}.landing-faq details{padding:0 var(--s4);border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}.landing-faq summary{display:flex;align-items:center;justify-content:space-between;gap:var(--s2);min-height:56px;cursor:pointer;font-weight:600;list-style:none}.landing-faq summary::-webkit-details-marker{display:none}.landing-faq summary:after{color:var(--muted);content:"+";font-size:1.25rem;line-height:1}.landing-faq details[open] summary:after{content:"\2212"}.landing-faq summary:hover{color:var(--primary)}.landing-faq details p{margin:0;padding:0 0 var(--s4);line-height:1.7}.landing-cta-band{border-top:1px solid #dbeafe;border-bottom:1px solid #dbeafe;background:#eff6ff;padding:64px 0}.landing-cta-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--s4)}.landing-cta-inner h2{margin:0;font-size:clamp(1.5rem,3vw,2rem);line-height:1.2;letter-spacing:-.02em}.landing-footer{border-top:1px solid var(--border);background:var(--surface);padding:var(--s4) 0}.landing-footer-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--s3);width:100%;max-width:1240px;margin:0 auto;padding:0 var(--s4)}.landing-footer-brand{display:inline-flex;align-items:center;gap:var(--s1);font-weight:700}.landing-footer-nav{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s3)}.landing-footer-nav a{display:inline-flex;align-items:center;min-height:44px;color:var(--muted);font-weight:600;text-decoration:none}.landing-footer-nav a:hover{color:var(--text)}.landing-footer-inner p{margin:0}@media(max-width:900px){.landing-nav{display:none}.landing-header-inner{padding:var(--s2) var(--s3)}.landing-hero{padding:var(--s5) 0 56px}.landing-hero-grid,.landing-see-grid{grid-template-columns:minmax(0,1fr);gap:var(--s5)}.landing-section{padding:56px 0}.landing-cta-inner{align-items:flex-start;flex-direction:column}}@media(max-width:600px){.landing-inner,.landing-footer-inner{padding:0 var(--s3)}.landing-header-inner{gap:var(--s2);padding:var(--s2) var(--s3)}.landing-header-actions{gap:var(--s1)}.landing-header-actions .btn{padding:0 var(--s2);font-size:.8125rem}.landing-hero-copy h1{font-size:2rem}.landing-paper,.landing-privacy{padding:var(--s4)}.landing-faq details{padding:0 var(--s3)}.landing-footer-inner{align-items:flex-start;flex-direction:column}}