:root{--bg:#f3f6fb;--surface:#fff;--ink:#172033;--muted:#667085;--line:#d9e1ee;--brand:#3157d5;--ok:#157347;--warn:#9a6700;--danger:#b42318}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 system-ui,sans-serif}header{min-height:68px;padding:12px 24px;background:#172033;color:white;display:flex;gap:24px;align-items:center;justify-content:space-between}header small{display:block;color:#cbd5e1}.layout{display:grid;grid-template-columns:minmax(210px,280px) minmax(0,1fr) minmax(220px,300px);gap:16px;padding:16px;max-width:1500px;margin:auto}.workspace{min-width:0}.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:16px;box-shadow:0 2px 8px #1620330b}.center{max-width:620px;margin:48px auto}.hidden{display:none!important}.actions{display:flex;gap:10px;flex-wrap:wrap}button{font:inherit;border:1px solid var(--line);background:white;border-radius:9px;padding:9px 12px;min-height:44px;cursor:pointer;text-align:left}button.primary{background:var(--brand);border-color:var(--brand);color:white}button:focus-visible,input:focus-visible{outline:3px solid #86a6ff;outline-offset:2px}button:disabled{opacity:.55;cursor:not-allowed}.resource{display:block;width:100%;margin:6px 0}.resource.locked{border-left:5px solid var(--warn)}.resource.accessible{border-left:5px solid var(--ok)}.badge{display:inline-block;border-radius:999px;padding:3px 8px;background:#e7ecf8}.badge.locked{background:#fff2cc;color:#6d4b00}.notice{max-width:1500px;margin:10px auto;padding:0 18px;min-height:24px}.notice.error{color:var(--danger);background:#fee4e2;padding:10px 18px}.phase{padding:7px;border-bottom:1px solid var(--line)}.phase.active{font-weight:700;border-left:4px solid var(--brand)}.delivery-block{border-left:4px solid var(--brand);padding:8px 14px;margin:12px 0;background:#f8faff;border-radius:8px;overflow-wrap:anywhere}.teacher-mode{border-top:5px solid #6b4eff}.teacher-turn{background:#f5f2ff;border:1px solid #d9d0ff;border-radius:12px;padding:16px;overflow-wrap:anywhere}.teacher-options{display:grid;gap:8px;margin:12px 0}.teacher-progress{color:var(--muted);font-size:14px}fieldset{border:1px solid var(--line);border-radius:8px;margin:12px 0}fieldset label{display:block;padding:7px}.eyebrow{color:var(--brand);font-weight:700;text-transform:uppercase;font-size:12px}h1,h2,h3{line-height:1.2}h2{font-size:18px}.library-nav{margin-top:1.5rem;border-top:1px solid var(--line);padding-top:1rem}.library-nav ul{list-style:none;margin:0;padding:0;display:grid;gap:.45rem}.library-nav li{color:#456478;font-size:.9rem}.library-grid{display:grid;gap:1rem}.library-card{border:1px solid #d5e1e9;border-radius:14px;padding:1rem;background:#fbfdfe}.library-card h2{margin:.65rem 0 .35rem}.library-card p{margin:.3rem 0}.library-card small{display:block;color:#6a7e8e;margin:.55rem 0}@media(max-width:900px){header{align-items:flex-start;flex-direction:column;gap:6px}.layout{grid-template-columns:1fr}.workspace{grid-row:2}nav{grid-row:1}aside{grid-row:3}body{overflow-x:hidden}.teacher-options{grid-template-columns:1fr}}