:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;--ink: #172126;--muted: #66737a;--line: #d8e0df;--paper: #f7f8f5;--panel: #ffffff;--brand: #2a6f68;--brand-dark: #1f524d;--accent: #e9c46a;--danger: #b94b4b;--gallery-chrome-height: 156px}*{box-sizing:border-box}body{margin:0;min-width:320px;color:var(--ink);background:var(--paper)}button,input,select,textarea{font:inherit}button{cursor:pointer}.app-shell{display:grid;grid-template-columns:260px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;display:flex;flex-direction:column;gap:28px;height:100vh;padding:22px;color:#fff;background:#203836}.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-size:24px;font-weight:800}.brand img{width:44px;height:44px;object-fit:contain}.nav-stack{display:grid;gap:8px}.nav-stack button,.text-button{min-height:42px;border:0;border-radius:8px;color:inherit;background:transparent;text-align:left}.nav-stack button{padding:10px 12px}.nav-stack button.active,.nav-stack button:hover{background:#ffffff1f}.profile-box{margin-top:auto;padding-top:18px;border-top:1px solid rgba(255,255,255,.18);color:#ffffffdb}.text-button{display:block;padding:8px 0;color:var(--accent)}.workspace{width:min(1440px,100%);padding:28px}.topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:22px}.eyebrow{margin:0 0 6px;color:var(--brand);font-size:13px;font-weight:800;text-transform:uppercase}h1,h2,p{margin-top:0}h1{max-width:760px;margin-bottom:0;font-size:clamp(32px,4vw,58px);line-height:1.02}h2{font-size:20px}.stat-strip{display:grid;min-width:108px;padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--panel);text-align:center}.stat-strip span{font-size:28px;font-weight:800}.stat-strip small{color:var(--muted)}.panel{padding:20px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.compact-panel{max-width:620px}.filter-grid{display:grid;grid-template-columns:minmax(180px,1.5fr) repeat(3,minmax(150px,1fr)) auto;gap:12px;align-items:end}label{display:grid;gap:6px;color:var(--muted);font-size:13px;font-weight:700}input,select,textarea{width:100%;min-height:42px;padding:9px 11px;border:1px solid var(--line);border-radius:8px;color:var(--ink);background:#fff}textarea{resize:vertical}.primary-button,.secondary-button,.danger-button{min-height:42px;padding:9px 14px;border-radius:8px;font-weight:800;text-decoration:none}.primary-button{border:1px solid var(--brand);color:#fff;background:var(--brand)}.primary-button:hover{background:var(--brand-dark)}.secondary-button{border:1px solid var(--line);color:var(--ink);background:#fff}.danger-button{border:1px solid rgba(185,75,75,.25);color:#fff;background:var(--danger)}.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:18px}.exam-card{display:grid;grid-template-rows:190px 1fr;overflow:hidden;border:1px solid var(--line);border-radius:8px;background:#fff}.exam-preview{position:relative;display:grid;place-items:center;overflow:hidden;width:100%;border:0;background:#e8ece8;padding:0}.exam-preview img{width:100%;height:100%;object-fit:cover}.pdf-preview{display:grid;place-items:center;width:72px;height:90px;border-radius:6px;color:#fff;background:var(--brand);font-weight:900}.page-badge{position:absolute;right:10px;bottom:10px;padding:5px 8px;border-radius:999px;color:#fff;background:#172126d1;font-size:12px;font-weight:800}.exam-body{display:grid;gap:8px;padding:14px}.exam-body h2{margin-bottom:0;font-size:17px}.exam-body p{margin:0;color:var(--muted);font-size:14px}.card-actions,.inline-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.stack-form{display:grid;gap:14px}.upload-workspace{display:grid;grid-template-columns:minmax(300px,440px) minmax(0,1fr);gap:16px;align-items:start}.upload-form-panel{position:sticky;top:18px;border-top:4px solid var(--brand)}.upload-form-panel textarea{min-height:132px}.admin-grid{display:grid;grid-template-columns:minmax(300px,420px) minmax(280px,360px);gap:16px;align-items:start}.admin-console{display:grid;gap:16px}.admin-hero{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:20px;border:1px solid var(--line);border-radius:8px;background:linear-gradient(135deg,#fff,#eef5f2)}.admin-hero h2{margin-bottom:0;font-size:28px}.admin-metrics{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}.admin-metrics span,.count-pill,.locked-pill{display:inline-flex;align-items:center;min-height:32px;padding:6px 10px;border-radius:999px;background:#e2ece9;color:#214f4a;font-size:13px;font-weight:800}.admin-metrics strong{margin-right:5px}.admin-console .admin-grid{grid-template-columns:minmax(320px,.95fr) minmax(320px,1fr)}.admin-card{display:grid;gap:16px;min-height:0}.teachers-card{grid-column:1 / -1}.card-heading{display:flex;justify-content:space-between;gap:12px;align-items:start;padding-bottom:12px;border-bottom:1px solid var(--line)}.card-heading h2{margin-bottom:0}.admin-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;align-items:end}.users-card .admin-form label:nth-of-type(1),.teachers-card .admin-form label:nth-of-type(1){grid-column:span 2}.admin-form .inline-actions,.admin-form>.primary-button{grid-column:1 / -1}.admin-list{display:grid;gap:8px;max-height:360px;overflow:auto;padding-right:3px}.teacher-list{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));max-height:520px}.admin-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;min-height:58px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fbfcfa}.admin-row strong,.admin-row small{display:block}.admin-row small{margin-top:3px;color:var(--muted)}.row-actions{display:flex;gap:6px}.locked-pill{background:#f0f1ef;color:var(--muted)}.exam-table-panel{grid-column:1 / -1}.exam-table,.user-list,.catalog-list{display:grid;gap:8px}.table-row,.user-row,.catalog-row{display:grid;grid-template-columns:minmax(160px,1fr) minmax(140px,220px) auto auto;gap:10px;align-items:center;padding:10px;border:1px solid var(--line);border-radius:8px}.user-row{grid-template-columns:1fr auto}.catalog-list{max-height:420px;overflow:auto;margin-top:14px}.catalog-row small,.table-row small{color:var(--muted)}.notice,.error{padding:12px 14px;border-radius:8px;font-weight:700}.notice{color:#1d514b;background:#dceee8}.error{color:#7a1e1e;background:#f4dada}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:40;display:grid;place-items:center;padding:18px;background:#0d1416d1}.gallery-modal{display:grid;grid-template-rows:auto minmax(0,1fr) auto;width:min(1180px,100%);height:min(92vh,920px);overflow:hidden;border-radius:8px;background:#101819;box-shadow:0 24px 80px #0006}.gallery-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 16px;color:#fff;background:#203836}.gallery-header h2,.gallery-header p{margin:0}.gallery-header p{color:#ffffffb8;font-size:14px}.icon-button{display:grid;place-items:center;width:42px;height:42px;border:1px solid rgba(255,255,255,.18);border-radius:8px;color:#fff;background:#ffffff14;font-size:30px;line-height:1}.gallery-stage{position:relative;display:grid;place-items:center;width:100%;height:100%;min-height:0;overflow:hidden;padding:12px;touch-action:pan-y}.gallery-stage img,.gallery-stage iframe{border:0}.gallery-stage img{display:block;width:auto;height:auto;max-width:calc(100vw - 96px);max-height:calc(92dvh - var(--gallery-chrome-height));object-fit:contain;object-position:center}.gallery-stage iframe{width:min(100%,calc(100vw - 96px));height:calc(92dvh - var(--gallery-chrome-height));max-height:100%;background:#fff}.gallery-arrow{position:absolute;top:50%;z-index:2;display:grid;place-items:center;width:48px;height:64px;border:1px solid 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var(--line);border-radius:8px}.detail-info{position:sticky;top:18px;display:grid;gap:14px}.detail-info dl{display:grid;gap:10px;margin:0}.detail-info dl div{display:grid;gap:2px;padding-bottom:10px;border-bottom:1px solid var(--line)}.detail-info dt{color:var(--muted);font-size:12px;font-weight:800;text-transform:uppercase}.detail-info dd{margin:0}.detail-notes{padding:12px;border-radius:8px;background:#f2f5f1;color:var(--ink)}@media(max-width:980px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;height:auto}.filter-grid,.admin-grid,.detail-layout,.upload-workspace{grid-template-columns:1fr}.admin-hero{align-items:flex-start;flex-direction:column}.admin-metrics{justify-content:flex-start}.admin-console .admin-grid,.admin-form,.teacher-list{grid-template-columns:1fr}.teachers-card,.users-card .admin-form label:nth-of-type(1),.teachers-card .admin-form label:nth-of-type(1){grid-column:auto}.detail-info,.upload-form-panel{position:static}.detail-stage 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