:root{--bg: #0b0d12;--card: #151a23;--accent: #4f8cff;--ok: #2ecc71;--no: #ff6b6b;--text: #eef2f8;--muted: #8b95a7;color-scheme:dark}*{box-sizing:border-box}html,body,#root{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app{height:100%;max-width:480px;margin:0 auto;display:flex;flex-direction:column;position:relative;overflow:hidden}.topbar{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-bottom:1px solid #232a36}.brand{font-weight:700;letter-spacing:.3px}.meta{color:var(--muted);font-size:12px}.scroller{flex:1;overflow-y:auto;scroll-snap-type:y mandatory;scrollbar-width:none}.scroller::-webkit-scrollbar{display:none}.card-slot{scroll-snap-align:start;height:100%}.card{height:100%;display:flex;flex-direction:column;justify-content:center;padding:24px;position:relative}.card-inner{flex:1;display:flex;flex-direction:column;justify-content:center}.card-kicker{color:var(--accent);font-size:12px;letter-spacing:1px;margin-bottom:16px}.card-body{font-size:20px;line-height:1.5}.card-progress{position:absolute;top:16px;right:16px;color:var(--muted);font-size:12px}.quiz{display:flex;flex-direction:column;gap:12px}.quiz-input,.panel-input{background:var(--card);border:1px solid #2a3343;border-radius:10px;color:var(--text);padding:12px;font-size:16px}.panel-input{width:100%;min-height:96px;resize:vertical}.quiz-result{font-weight:600}.quiz-result.ok{color:var(--ok)}.quiz-result.no{color:var(--no)}.adapt{margin-top:8px;color:var(--muted);font-weight:400;font-size:14px}.btn{background:var(--accent);color:#fff;border:none;border-radius:999px;padding:12px 18px;font-size:15px;font-weight:600;cursor:pointer}.btn:disabled{opacity:.5;cursor:default}.btn.ghost{background:transparent;border:1px solid #2a3343;color:var(--text)}.btn.raise{background:#233;border:1px solid var(--accent);color:var(--accent)}.controls{display:flex;gap:12px;justify-content:space-between;padding:12px 16px;border-top:1px solid #232a36}.panel-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:flex-end;justify-content:center}.panel{background:var(--card);width:100%;border-radius:18px 18px 0 0;padding:20px;display:flex;flex-direction:column;gap:14px}.panel-title{font-weight:700}.panel-answer{line-height:1.5}.panel-actions{display:flex;gap:10px;justify-content:flex-end}.nav{display:flex;gap:6px}.tab{background:transparent;border:1px solid #2a3343;color:var(--muted);border-radius:999px;padding:6px 14px;font-size:13px;cursor:pointer}.tab.on{color:var(--text);border-color:var(--accent)}.meta{display:flex;align-items:center;gap:8px}.btn.tiny{padding:6px 10px;font-size:12px}.btn.danger{background:transparent;border:1px solid var(--no);color:var(--no)}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:8px 0}.learn{flex:1;display:flex;flex-direction:column;min-height:0}.subbar{padding:6px 16px;color:var(--muted);font-size:12px;border-bottom:1px solid #232a36}.signin{height:100%;display:flex;align-items:center;justify-content:center}.signin-card{background:var(--card);border:1px solid #232a36;border-radius:16px;padding:28px;width:320px;display:flex;flex-direction:column;gap:12px}.brand-lg{font-size:26px;font-weight:800}.muted{color:var(--muted)}.small{font-size:12px}.btn.google{background:#fff;color:#222;display:flex;align-items:center;gap:10px;justify-content:center}.btn.google .g{font-weight:800;color:#4285f4}.panelview{flex:1;overflow-y:auto;padding:16px}.panelview h2{margin:4px 0}.module-block{background:var(--card);border:1px solid #232a36;border-radius:12px;padding:14px;margin:12px 0}.module-head{margin-bottom:8px}.field{display:flex;flex-direction:column;gap:4px;margin:8px 0;font-size:13px;color:var(--muted)}.card-edit{border-top:1px solid #232a36;padding:10px 0}.card-edit-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}.result{margin-top:14px;padding:12px;border-radius:10px}.result.ok{border:1px solid var(--ok)}.result.no{border:1px solid var(--no)}.result ul{margin:6px 0 0 18px}code{background:#0d1018;padding:2px 6px;border-radius:6px}.panelview.center{display:flex;align-items:center;justify-content:center;text-align:center}.building{display:flex;flex-direction:column;align-items:center;gap:12px;max-width:360px}.spinner{width:42px;height:42px;border-radius:50%;border:4px solid #2a3343;border-top-color:var(--accent);animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}select.quiz-input{-webkit-appearance:none;-moz-appearance:none;appearance:none}.logo-img{width:100%;max-width:260px;height:auto;align-self:center;border-radius:12px}