:root{color-scheme:dark;--bg:#0c1412;--surface:#15201d;--surface2:#21312d;--line:#354a44;--text:#e8f1ed;--muted:#a8b8b2;--mint:#7cc8ba;--amber:#ffb36b;--danger:#ff8c8c;--nav:76px;font-family:Inter,Segoe UI,Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);min-height:100vh}button,input,textarea,select{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;padding-bottom:calc(var(--nav) + env(safe-area-inset-bottom))}.topbar{height:64px;position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:12px;padding:0 18px;background:#101b18e8;backdrop-filter:blur(12px);border-bottom:1px solid #22342f}.brand-icon{width:40px;height:40px;border-radius:8px;object-fit:cover}.topbar h1{font-size:20px;margin:0;letter-spacing:0}.topbar .spacer{flex:1}.streak{color:var(--amber);font-weight:700}.screen{max-width:1000px;margin:0 auto;padding:18px}.bottom-nav{position:fixed;z-index:20;bottom:0;left:0;right:0;min-height:var(--nav);padding-bottom:env(safe-area-inset-bottom);display:flex;overflow-x:auto;background:#171c1b;border-top:1px solid #2c3734}.nav-btn{min-width:82px;flex:1;border:0;background:transparent;color:#b8c4bf;padding:10px 6px 8px;display:grid;gap:4px;place-items:center}.nav-btn.active{color:var(--mint);background:#20302c}.nav-btn .icon{font-size:22px}.nav-btn span:last-child{font-size:12px;font-weight:650}.toolbar,.row{display:flex;align-items:center;gap:10px}.toolbar{margin-bottom:16px;flex-wrap:wrap}.toolbar h2{margin:0 auto 0 0}.button,.icon-button{border:1px solid var(--line);background:var(--surface2);color:var(--text);border-radius:7px;padding:10px 14px;font-weight:650}.button.primary{background:var(--mint);color:#07110e;border-color:var(--mint)}.button.danger{color:var(--danger)}.icon-button{width:42px;height:42px;padding:0;display:grid;place-items:center;font-size:20px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}.card{background:var(--surface);border:1px solid #263833;border-radius:8px;padding:15px}.card.clickable:hover{border-color:var(--mint);transform:translateY(-1px)}.card h3,.card h4{margin:0 0 7px}.muted{color:var(--muted)}.accent{color:var(--mint)}.amber{color:var(--amber)}.field{display:grid;gap:6px;margin-bottom:12px}.field label{font-size:13px;color:var(--muted);font-weight:700}.input,.textarea,.select{width:100%;border:1px solid var(--line);border-radius:7px;background:#101916;color:var(--text);padding:11px}.textarea{min-height:130px;resize:vertical}.chips{display:flex;gap:7px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:transparent;color:var(--text);border-radius:999px;padding:7px 11px}.chip.active{background:var(--mint);color:#07110e;border-color:var(--mint)}.dialog-backdrop{position:fixed;z-index:50;inset:0;background:#000b;display:grid;place-items:center;padding:16px}.dialog{width:min(620px,100%);max-height:88vh;overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:18px}.dialog h2{margin-top:0}.dialog-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:15px}.story-text{font-size:clamp(20px,2.2vw,30px);line-height:1.75;white-space:pre-wrap}.word{cursor:pointer;border-radius:3px}.word:hover{background:#7cc8ba33}.vocab-word{font-weight:800;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}.lookup{position:sticky;top:72px;background:#362b49;border:1px solid #6c5a88;border-radius:8px;padding:14px;margin-bottom:14px}.story-card p{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.message-list{display:flex;flex-direction:column;gap:10px;min-height:330px;max-height:58vh;overflow:auto;padding:8px}.message{max-width:78%;padding:11px 14px;border-radius:17px;background:var(--surface2);line-height:1.55}.message.user{align-self:flex-end;background:var(--mint);color:#07110e}.message .meta{font-size:12px;opacity:.7;margin-top:5px}.chat-compose{display:flex;gap:8px;margin-top:10px}.chat-compose .input{flex:1}.avatar{width:50px;height:50px;border-radius:50%;background:var(--amber);color:#17100a;display:grid;place-items:center;font-size:22px;font-weight:900}.thread{display:flex;align-items:center;gap:12px}.thread .details{flex:1}.canvas-wrap{max-width:620px;margin:auto}.draw-canvas{width:100%;aspect-ratio:1;background:#f7f7f2;border:2px solid var(--line);touch-action:none;display:block}.trace-glyph{position:absolute;inset:0;display:grid;place-items:center;color:#2222;font-size:clamp(80px,25vw,240px);pointer-events:none}.canvas-stage{position:relative}.plank-board{position:relative;height:430px;background:#050505;overflow:hidden;border:1px solid var(--line);perspective:900px}.plank{position:absolute;width:58%;height:65px;left:21%;top:var(--y);transform:rotate(var(--r));background:linear-gradient(110deg,var(--c),#fff5,var(--c));border:2px solid #fff6;box-shadow:0 9px 12px #000a;border-radius:7px}.screw{position:absolute;width:58px;height:58px;border-radius:50%;background:radial-gradient(circle at 35% 25%,#fff,#d8d8d1 55%,#999);color:#111;border:2px solid white;font-weight:900;display:grid;place-items:center;overflow:hidden}.quiz-options{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.progress{height:10px;background:#26332f;border-radius:5px;overflow:hidden}.progress>i{display:block;height:100%;background:var(--mint)}.list-table{display:grid;gap:7px}.list-row{display:grid;grid-template-columns:minmax(110px,1fr) minmax(100px,1fr) minmax(100px,1fr);gap:10px;padding:10px;border-bottom:1px solid var(--line)}.audio-row{display:flex;align-items:center;gap:10px}.audio-row audio{flex:1;max-width:100%}.notice{padding:12px;border-left:3px solid var(--amber);background:#2b241b;color:#f5d8b8}.empty{padding:40px 15px;text-align:center;color:var(--muted)}@media(max-width:680px){.screen{padding:13px}.topbar{padding:0 12px}.topbar h1{font-size:18px}.bottom-nav{justify-content:flex-start}.nav-btn{flex:0 0 74px}.grid{grid-template-columns:1fr}.list-row{grid-template-columns:1fr}.message{max-width:91%}.story-text{font-size:22px}.quiz-options{grid-template-columns:1fr}}