:root{--g:#274b2f;--g2:#3d6c46;--bg:#f3f6f2;--card:#fff;--line:#dbe5da;--txt:#172019;--muted:#657069;--bad:#ad3333;--ok:#1f7a3a}*{box-sizing:border-box}body{margin:0;background:var(--bg);font:16px/1.45 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--txt)}button,input,select{font:inherit}.shell{max-width:1100px;margin:auto;padding:14px 14px 90px}.top{position:sticky;top:0;z-index:5;background:rgba(243,246,242,.94);backdrop-filter:blur(12px);padding:10px 0}.brand{display:flex;align-items:center;justify-content:space-between}.logo{font-weight:950;font-size:1.25rem;color:var(--g)}.card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:0 8px 30px rgba(20,40,24,.06);margin-bottom:14px}.hero{background:linear-gradient(135deg,var(--g),var(--g2));color:#fff;border:none}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}@media(max-width:700px){.grid{grid-template-columns:1fr}}.bigbtn{display:block;width:100%;padding:18px;border:0;border-radius:16px;background:var(--g);color:white;font-weight:900;cursor:pointer}.secondary{background:#eef3ee;color:var(--txt);border:1px solid var(--line)}input,select{width:100%;padding:13px;border:1px solid var(--line);border-radius:13px;background:#fff}.row{display:flex;gap:10px;flex-wrap:wrap}.row>*{flex:1;min-width:130px}.muted{color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stat{background:#fafcf9;border:1px solid var(--line);border-radius:15px;padding:12px}.num{font-size:1.55rem;font-weight:950}.hidden{display:none!important}.opts{display:grid;gap:10px;margin:14px 0}.opt{padding:13px;border:1px solid var(--line);border-radius:14px;display:flex;gap:10px}.opt input{width:auto}.good{background:#e9f5ec;border-color:#b8d8c0}.bad{background:#faecec;border-color:#e0bcbc}.nav{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);display:flex;justify-content:center;gap:4px;padding:7px;z-index:10}.nav button{max-width:180px;background:transparent;color:var(--txt);border:0;padding:10px}.roomcode{font-size:2rem;font-weight:950;letter-spacing:.12em}.player{display:flex;justify-content:space-between;padding:10px;border-bottom:1px solid var(--line)}h1,h2,h3{margin-top:0}

.question-tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.note-btn{width:auto!important}
.note-editor{margin-top:14px;padding:16px;border:1px solid var(--line);border-radius:16px;background:#fafcf9}
.note-editor textarea,#commentText{width:100%;min-height:105px;padding:12px;border:1px solid var(--line);border-radius:12px;font:inherit;resize:vertical}
.note-check{display:flex;gap:9px;align-items:center;margin:10px 0}.note-check input{width:auto}
.note-list{display:grid;gap:10px;margin-top:12px}.note-card,.board-note{padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff;cursor:pointer}
.note-card:hover,.board-note:hover{background:#f6faf6}.note-meta{font-size:.9rem;color:#667268;margin-bottom:6px}.resolved{opacity:.65}
.board-tabs{display:flex;gap:9px;flex-wrap:wrap}.board-tabs button{width:auto}.question-snippet{font-weight:800;margin-bottom:7px}.note-text{margin-bottom:8px}
.discussion-main{padding:15px;border-left:4px solid #285b37;background:#f6faf6;border-radius:10px;margin:14px 0}
.comment{padding:12px 0;border-bottom:1px solid var(--line)}.comment:last-of-type{border-bottom:0}

.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0 18px}
.subject-btn{background:#f8faf8;border:1px solid var(--line);border-radius:14px;padding:11px;color:var(--txt);cursor:pointer;display:grid;gap:2px;text-align:center}
.subject-btn span{font-size:1.25rem}.subject-btn small{color:var(--muted)}
.official-link,.source-primary{display:inline-block;padding:9px 11px;border-radius:11px;background:#eef3ee;color:var(--g);font-weight:800;text-decoration:none;border:1px solid var(--line)}
.help-box{margin-top:14px;padding:16px;background:#fbfdfb;border:1px solid var(--line);border-radius:16px}.help-section{padding:10px 0;border-bottom:1px solid var(--line)}.help-section:last-child{border-bottom:0}
.help-section a,.resource a{color:var(--g);font-weight:800}.resource{padding:11px 0;border-bottom:1px solid var(--line)}.resource:last-child{border-bottom:0}.source-note{padding:11px;border-radius:12px;background:#fff6d8}
.upload-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:12px}.material-textarea{width:100%;min-height:90px;padding:12px;border:1px solid var(--line);border-radius:13px;font:inherit;resize:vertical}
.category-tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:14px}.category-tabs button{width:auto;padding:9px 11px;border:0;border-radius:999px;background:var(--g);color:#fff}.category-tabs button.secondary{background:#eef3ee;color:var(--txt)}
.materials-list{display:grid;gap:9px}.material-card{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;padding:13px;border:1px solid var(--line);border-radius:14px}.material-main{display:flex;gap:11px;min-width:0}.file-icon{font-size:1.5rem}.material-card a{color:var(--g);text-decoration:none}.material-desc{margin-top:6px}
.danger-small{width:auto;border:1px solid #e1baba;background:#fff0f0;color:#8d2929;border-radius:10px;padding:8px 10px;cursor:pointer}
.nav{overflow-x:auto;justify-content:flex-start}.nav button{flex:0 0 auto;white-space:nowrap}
@media(min-width:900px){.nav{justify-content:center}}@media(max-width:650px){.subject-grid{grid-template-columns:repeat(2,1fr)}.upload-grid{grid-template-columns:1fr}}

.room-topline{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}
.room-name{font-size:1.1rem;font-weight:800;margin-top:4px;opacity:.95}
.leave-room-btn{width:auto!important;background:rgba(255,255,255,.14)!important;color:#fff!important;border:1px solid rgba(255,255,255,.3)!important;border-radius:12px!important;padding:10px 12px!important;white-space:nowrap}
.leave-room-btn:hover{background:rgba(255,255,255,.22)!important}
@media(max-width:600px){.room-topline{flex-direction:column}.leave-room-btn{align-self:flex-start}}

.version-badge{display:inline-block;margin-left:8px;padding:3px 7px;border-radius:999px;background:#e8f1e9;color:#285b37;font-size:.72rem;font-weight:800;vertical-align:middle}

.forgot-link{color:#285b37;font-weight:800;text-decoration:none}.forgot-link:hover{text-decoration:underline}