:root{color-scheme:light;--bg:#f7f3ee;--panel:#fffaf4;--ink:#1d1b18;--muted:#70675d;--line:#ded4c8;--accent:#7c3aed;--accent-soft:#ede3ff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif}a{color:inherit}.shell{margin:0 auto;max-width:1180px;padding:32px 20px}.auth-shell{max-width:520px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:0 18px 50px rgb(65 45 30/8%);padding:24px}.grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}.assignment-card-grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.assignment-card{background:white;border:1px solid var(--line);border-radius:14px;color:inherit;display:block;padding:18px;text-decoration:none}.assignment-card h3{margin-bottom:8px}.assignment-meta{color:var(--muted);display:flex;flex-wrap:wrap;gap:10px;font-size:14px}.stat{background:white;border:1px solid var(--line);border-radius:14px;padding:16px}.stat strong{display:block;font-size:28px;margin-top:8px}.badge{background:var(--accent-soft);border-radius:999px;color:var(--accent);display:inline-block;font-size:12px;font-weight:700;letter-spacing:.04em;padding:6px 10px;text-transform:uppercase}table{border-collapse:collapse;width:100%}button,input,select{font:inherit}input,select,textarea{background:white;border:1px solid var(--line);border-radius:10px;display:block;margin-top:6px;padding:10px;width:100%}textarea{min-height:120px;resize:vertical}.compact-textarea{min-height:44px}.math-preview{display:block;margin-top:6px;color:var(--muted);font-size:14px;line-height:1.5}.mark-scheme-table td,.math-preview{white-space:pre-wrap}fieldset{border:1px solid var(--line);border-radius:14px;margin:18px 0;padding:14px}legend{color:var(--muted);font-weight:700;padding:0 6px}.form-grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.checkbox-grid{display:grid;grid-gap:8px 14px;gap:8px 14px;grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}.checkbox-grid label{align-items:center;display:flex;gap:8px}.checkbox-grid input,td input[type=checkbox]{display:inline-block;margin:0;width:auto}.select-all-row{align-items:center;display:flex;font-weight:700;gap:8px;margin:12px 0}.select-all-row input{display:inline-block;margin:0;width:auto}.button{background:var(--accent);border:0;border-radius:999px;color:white;cursor:pointer;font-weight:700;padding:12px 18px}.button:disabled{cursor:not-allowed;opacity:.45}.button-secondary{background:white;border:1px solid var(--line);border-radius:999px;color:var(--text);cursor:pointer;font-weight:700;padding:8px 12px}.small-button{font-size:12px;padding:8px 12px}td,th{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top}th{color:var(--muted);font-size:12px;text-transform:uppercase}.student-shell{max-width:980px}.student-hero{margin-bottom:20px}.student-question{margin-top:20px}.student-question-header{align-items:baseline;display:flex;justify-content:space-between;gap:16px}.student-question-header h2{margin-bottom:12px}.student-question-header span{color:var(--muted);font-weight:700}.student-question-image{background:white;border:1px solid var(--line);border-radius:12px;display:block;height:auto;margin:12px 0 18px;max-width:100%}.answer-form{border-top:1px solid var(--line);display:grid;grid-gap:12px;gap:12px;padding-top:18px}.save-note{color:var(--muted);font-size:14px}.error-text{color:#b42318;font-weight:700}.marking-question{margin-top:20px}.marking-grid{display:grid;grid-gap:20px;gap:20px;grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr)}.answer-box{background:white;border:1px solid var(--line);border-radius:12px;min-height:90px;padding:14px;white-space:pre-wrap}.mark-scheme-preview{max-height:340px;overflow:auto}.mark-scheme-preview,.readable-mark-scheme{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;white-space:pre-wrap}.readable-mark-scheme{font-family:inherit;line-height:1.5}.mark-scheme-table{background:white;border:1px solid var(--line);border-radius:12px;overflow:hidden}.mark-scheme-table td,.mark-scheme-table th{border:1px solid var(--line);vertical-align:top}.mark-scheme-table th{color:var(--ink);font-size:13px;text-align:center}.result-question{margin-top:20px}.result-grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.feedback-box{background:#f2fff6;border:1px solid #b8e4c4;border-radius:12px;min-height:90px;padding:14px;white-space:pre-wrap}.muted-box{background:white;border-color:var(--line);color:var(--muted)}.working-image-grid{display:grid;grid-gap:12px;gap:12px;grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}.working-image{background:white;border:1px solid var(--line);border-radius:12px;height:auto;max-width:100%}.rendered-page-grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.rendered-page-card{background:white;border:1px solid var(--line);border-radius:12px;display:block;padding:10px;text-decoration:none}.rendered-page-card img{border:1px solid var(--line);display:block;height:auto;width:100%}.rendered-page-card span{display:block;font-weight:700;margin-top:8px}@media (max-width:900px){.marking-grid{grid-template-columns:1fr}}