:root{--bg: #0a0a0b;--surface: #141417;--surface-2: #1c1c20;--surface-3: #26262b;--border: #26262b;--border-strong: #34343a;--text: #ededf0;--text-dim: #9a9aa3;--text-mute: #6b6b73;--accent: #3b82f6;--accent-hover: #2563eb;--accent-ink: #f8fbff;--accent-soft: rgba(59, 130, 246, .12);--accent-soft-2: rgba(59, 130, 246, .2);--success: #22c55e;--success-soft: rgba(34, 197, 94, .14);--danger: #ef4444;--danger-soft: rgba(239, 68, 68, .13);--warn: #f59e0b;--warn-soft: rgba(245, 158, 11, .13);--xp: #f59e0b;--radius: 14px;--radius-sm: 10px;--radius-lg: 20px;--shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 6px 20px rgba(0, 0, 0, .28);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .35);--ring: 0 0 0 3px var(--accent-soft);--max-width: 480px;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-feature-settings:"cv02","cv03","cv04","cv11";-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{margin:0;height:100%}body{background:var(--bg);color:var(--text);overscroll-behavior-y:none;line-height:1.5}#root{display:flex;justify-content:center}h1,h2,h3,h4{letter-spacing:-.02em;line-height:1.25}::selection{background:var(--accent-soft-2)}.app-shell{width:100%;max-width:var(--max-width);min-height:100%;display:flex;flex-direction:column;background:var(--bg);position:relative}.content{flex:1;padding:18px 16px calc(88px + env(safe-area-inset-bottom));overflow-y:auto}.brand-mark{display:inline-flex;align-items:center;gap:8px;font-weight:800;letter-spacing:-.03em}.brand-mark svg{color:var(--accent)}.brand-accent{color:var(--accent)}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:12px 16px;padding-top:calc(12px + env(safe-area-inset-top));background:#0a0a0bb8;backdrop-filter:saturate(160%) blur(12px);-webkit-backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--border)}.topbar h1{font-size:19px;margin:0}.xp-pill{display:inline-flex;align-items:center;gap:6px;background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:6px 12px;font-weight:700;font-size:13px;color:var(--text)}.xp-pill svg{color:var(--xp)}.bottom-nav{position:fixed;bottom:0;width:100%;max-width:var(--max-width);display:flex;justify-content:space-around;background:#141417d9;backdrop-filter:saturate(160%) blur(12px);-webkit-backdrop-filter:saturate(160%) blur(12px);border-top:1px solid var(--border);padding:8px 0 calc(8px + env(safe-area-inset-bottom))}.bottom-nav a{flex:1;text-align:center;text-decoration:none;color:var(--text-mute);font-size:11px;font-weight:600;display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px 4px;transition:color .15s}.bottom-nav a.active{color:var(--accent)}.nav-icon{display:inline-flex}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px;box-shadow:var(--shadow-sm)}.chapter-card{display:flex;align-items:center;gap:14px;cursor:pointer;transition:transform .1s ease,border-color .15s,box-shadow .15s}.chapter-card:hover{border-color:var(--border-strong);box-shadow:var(--shadow)}.chapter-card:active{transform:scale(.985)}.chapter-icon{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.chapter-meta{flex:1;min-width:0}.chapter-meta h3{margin:0 0 4px;font-size:16px}.chapter-meta p{margin:0;font-size:13px;color:var(--text-dim)}.chapter-cat{font-size:11px;text-transform:uppercase;letter-spacing:.6px;color:var(--text-mute);display:flex;align-items:center;justify-content:space-between;font-weight:600}.chapter-delete{display:inline-flex;align-items:center;justify-content:center;background:transparent;border:none;color:var(--text-mute);padding:4px;cursor:pointer;border-radius:8px;transition:color .15s,background .15s}.chapter-delete:hover{color:var(--danger);background:var(--danger-soft)}.progress-track{height:7px;background:var(--surface-3);border-radius:999px;overflow:hidden;margin-top:8px}.progress-fill{height:100%;background:var(--accent);border-radius:999px;transition:width .4s ease}.exercise-row{display:flex;align-items:center;gap:12px;padding:14px;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;background:var(--surface);cursor:pointer}.exercise-row:active{transform:scale(.99)}.exercise-badge{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0;border:2px solid var(--border-strong);color:var(--text-dim)}.exercise-badge.done{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.exercise-row .ex-title{flex:1;font-size:15px}.diff-dots{font-size:11px;color:var(--text-mute);letter-spacing:1px}.code-block{background:#08080a;border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;overflow-x:auto;font-family:SF Mono,Fira Code,ui-monospace,monospace;font-size:13px;line-height:1.6;white-space:pre;margin:12px 0}.code-lang{display:inline-block;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:var(--text-mute);margin-bottom:2px}button{font-family:inherit}.btn{width:100%;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 18px;border:1px solid transparent;border-radius:var(--radius);background:var(--accent);color:var(--accent-ink);font-size:15px;font-weight:700;letter-spacing:-.01em;cursor:pointer;transition:transform .06s ease,background .15s,opacity .2s,border-color .15s}.btn:hover:not(:disabled){background:var(--accent-hover)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn:active:not(:disabled){transform:translateY(1px)}.btn:focus-visible{outline:none;box-shadow:var(--ring)}.btn-secondary{background:var(--surface-2);color:var(--text);border-color:var(--border-strong)}.btn-secondary:hover:not(:disabled){background:var(--surface-3)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-ghost{background:transparent;color:var(--text-dim);border:1px solid var(--border-strong)}.btn-ghost:hover:not(:disabled){background:var(--surface-2);color:var(--text)}.type-meta-row{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:2px 0 6px}.type-chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;padding:5px 11px;border-radius:999px;border:1px solid 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textarea:focus{outline:none;border-color:var(--accent);box-shadow:var(--ring)}.create-trigger{margin-bottom:14px}.create-form{border-color:var(--border-strong)}.create-form-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:4px}.create-form-head .back-link{margin-bottom:0}.picker-label{display:block;font-size:13px;color:var(--text-dim);margin:4px 0 8px}.option{display:flex;align-items:center;gap:12px;padding:14px;border:1.5px solid var(--border-strong);border-radius:var(--radius);margin-bottom:10px;cursor:pointer;background:var(--surface);transition:border-color .12s,background .12s,transform .06s;font-size:15px}.option:hover{border-color:var(--text-mute)}.option:active{transform:scale(.995)}.option.selected{border-color:var(--accent);background:var(--accent-soft)}.option.correct{border-color:var(--success);background:var(--success-soft)}.option.wrong{border-color:var(--danger);background:var(--danger-soft)}.option .opt-marker{font-family:ui-monospace,monospace;font-weight:700;color:var(--text-mute);flex:none;width:18px;text-align:center}.match-board{display:flex;flex-direction:column;gap:10px}.match-row{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1.5px solid var(--border-strong);border-radius:var(--radius);background:var(--surface);transition:border-color .12s,background .12s}.match-row.correct{border-color:var(--success);background:var(--success-soft)}.match-row.wrong{border-color:var(--danger);background:var(--danger-soft)}.match-left{flex:1;font-size:15px}.match-arrow{color:var(--text-mute);flex:none;display:inline-flex}.match-select{flex:1;min-width:0;padding:10px 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--surface-2);color:var(--text);font-size:14px}.match-select:focus{outline:none;border-color:var(--accent);box-shadow:var(--ring)}.match-select:disabled{opacity:.9}.feedback{border-radius:var(--radius);padding:16px;margin-top:16px;border:1px solid transparent}.feedback.ok{background:var(--success-soft);border-color:#22c55e66}.feedback.bad{background:var(--danger-soft);border-color:#ef444466}.feedback.warn{background:var(--warn-soft);border-color:#f59e0b66}.feedback h4{display:flex;align-items:center;gap:8px;margin:0 0 6px;font-size:15px}.feedback.ok h4{color:var(--success)}.feedback.bad h4{color:var(--danger)}.feedback.warn h4{color:var(--warn)}.feedback p{margin:0;font-size:14px;color:var(--text);line-height:1.5}.spinner{display:inline-block;border-style:solid;border-color:color-mix(in srgb,currentColor 22%,transparent);border-top-color:currentColor;border-radius:50%;animation:spin .7s linear infinite;flex:none}@keyframes spin{to{transform:rotate(360deg)}}.loading-card{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;padding:36px 24px;color:var(--text)}.loading-card .spinner{color:var(--accent)}.loading-overlay{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center;padding:44px 24px;margin-top:40px}.loading-overlay .spinner{color:var(--accent)}.inline-loading{display:inline-flex;align-items:center;gap:8px;color:var(--text-dim);font-size:14px}.inline-loading .spinner{color:var(--accent)}.sk{display:block;border-radius:6px;background:linear-gradient(90deg,var(--surface-2) 25%,var(--surface-3) 50%,var(--surface-2) 75%);background-size:200% 100%;animation:sk-shimmer 1.3s ease-in-out infinite}.sk-icon{width:26px;height:26px;border-radius:8px}.sk-title{width:65%;height:13px}.sk-desc{width:100%;height:10px}.sk-desc.short{width:80%}@keyframes sk-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.muted{color:var(--text-dim)}.center-screen{flex:1;display:flex;flex-direction:column;justify-content:center;padding:24px;min-height:70vh;width:100%;max-width:400px;margin:0 auto}.section-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--text-mute);margin:22px 0 10px}.back-link{display:inline-flex;align-items:center;gap:5px;background:none;border:none;color:var(--text-dim);font-size:14px;font-weight:500;padding:0;margin-bottom:14px;cursor:pointer;transition:color .15s}.back-link:hover{color:var(--text)}.error-text{color:var(--danger);font-size:14px;margin:8px 0}.tab-switch{display:flex;gap:6px;margin:16px 0;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:4px}.tab-switch button{flex:1;padding:9px;background:transparent;border:none;border-radius:8px;color:var(--text-dim);font-weight:600;font-size:14px;cursor:pointer;transition:background .15s,color .15s}.tab-switch button.active{background:var(--accent);color:var(--accent-ink)}.big-xp{display:inline-flex;align-items:center;gap:8px;font-size:40px;font-weight:800;color:var(--text)}.big-xp svg{color:var(--xp)}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat-grid .card{text-align:center;margin:0}.stat-num{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:26px;font-weight:800}.stat-num svg{color:var(--warn)}.avatar{width:76px;height:76px;border-radius:50%;background:var(--surface-2);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;color:var(--accent);margin:0 auto 12px}.chapter-grid{display:grid;grid-template-columns:1fr;gap:12px}.chapter-grid .card{margin-bottom:0}.nav-brand{display:none}@media (min-width: 768px){:root{--max-width: 1040px}html,body,#root{height:auto;min-height:100%}#root{align-items:flex-start}.app-shell--nav{max-width:var(--max-width);min-height:100vh;display:grid;grid-template-columns:240px 1fr;grid-template-rows:auto 1fr;grid-template-areas:"nav topbar" "nav content";border-left:1px solid var(--border);border-right:1px solid var(--border)}.bottom-nav{grid-area:nav;position:sticky;top:0;align-self:start;height:100vh;width:auto;max-width:none;flex-direction:column;justify-content:flex-start;gap:4px;padding:22px 14px;border-top:none;border-right:1px solid var(--border);background:var(--surface);-webkit-backdrop-filter:none;backdrop-filter:none}.nav-brand{display:block;font-size:20px;padding:6px 12px 18px}.bottom-nav a{flex:none;width:100%;flex-direction:row;justify-content:flex-start;gap:12px;font-size:14px;padding:11px 13px;border-radius:var(--radius-sm)}.bottom-nav a:hover{background:var(--surface-2);color:var(--text)}.bottom-nav a.active{background:var(--accent-soft);color:var(--accent)}.topbar{grid-area:topbar;justify-content:flex-end;background:#0a0a0bb8}.topbar-brand{display:none}.content{grid-area:content;overflow:visible;padding:26px 34px 56px}.chapter-grid{grid-template-columns:repeat(2,1fr);gap:14px}.chapter-card{margin-bottom:0}}.play-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.hearts{display:inline-flex;align-items:center;gap:4px;color:var(--danger)}.heart{display:inline-flex}.heart.spent{color:var(--surface-3)}.report-btn{display:inline-flex;align-items:center;gap:5px;background:transparent;border:none;color:var(--text-mute);font-size:12px;font-weight:600;cursor:pointer;padding:5px 8px;border-radius:8px;transition:color .15s,background .15s}.report-btn:hover{color:var(--text);background:var(--surface-2)}.report-menu{margin-bottom:12px;padding:12px}.report-reason{display:block;width:100%;text-align:left;background:var(--surface-2);color:var(--text);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:9px 12px;margin-bottom:6px;cursor:pointer;font-size:14px;transition:border-color .15s}.report-reason:hover{border-color:var(--accent)}.streak-banner{display:flex;align-items:center;gap:16px;margin-bottom:16px}.streak-flame{display:flex;align-items:center;gap:10px;flex-shrink:0}.flame-icon{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;background:var(--warn-soft);color:var(--warn)}.flame-icon.cold{background:var(--surface-2);color:var(--text-mute)}.streak-num{font-size:22px;font-weight:800}.daily-goal{flex:1}.daily-goal-head{display:flex;justify-content:space-between;margin-bottom:6px;font-size:12px}.level-pips{display:inline-flex;gap:5px;align-items:center}.lpip{width:8px;height:8px;border-radius:50%;border:2px solid var(--border-strong);background:transparent;display:inline-block}.lpip.done{background:var(--accent);border-color:var(--accent)}.lpip.current{border-color:var(--accent);background:transparent;box-shadow:0 0 0 2px var(--accent-soft)}.lpip.locked{border-color:var(--surface-3)}.chapter-card-foot{display:flex;align-items:center;gap:8px;margin-top:10px}.chapter-level-row{display:flex;align-items:center;gap:10px;margin:0 0 14px}.theory-link{display:inline-flex;align-items:center;gap:6px;margin-left:auto;background:var(--surface-2);color:var(--text);border:1px solid var(--border-strong);border-radius:999px;padding:5px 12px;font-size:12px;font-weight:600;cursor:pointer;transition:border-color .15s,background .15s}.theory-link:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.theory-link:disabled{opacity:.6;cursor:default}.lesson-wrap{margin-top:4px}.lesson-head{display:flex;justify-content:space-between;align-items:center}.lesson-badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;padding:5px 11px;border-radius:999px;background:var(--accent-soft);color:var(--accent)}.lesson-card{padding:18px}.lesson-card h3{margin-bottom:8px}.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:16px}.lesson-nav .btn{flex:1}.lesson-dots{display:flex;justify-content:center;gap:7px;margin-top:14px}.ldot{width:7px;height:7px;border-radius:50%;background:var(--surface-3);transition:background .2s}.ldot.active{background:var(--accent)}.levelup-card{text-align:center;padding:24px;margin-top:16px;border:1px solid rgba(59,130,246,.4);background:linear-gradient(180deg,var(--accent-soft),transparent)}.levelup-card .trophy{display:inline-flex;color:var(--xp);margin-bottom:4px}.course-head{display:flex;align-items:center;gap:14px;margin:6px 0 14px}.course-overview{color:var(--text-dim);line-height:1.6;margin:0 0 14px}.objectives-card{padding:14px 16px;margin-bottom:18px}.objectives{margin:8px 0 0;padding-left:18px}.objectives li{margin-bottom:5px;font-size:14px;color:var(--text-dim)}.level-section{margin-bottom:20px}.level-section-head{margin:16px 0 10px}.level-tag{display:inline-block;font-size:12px;font-weight:600;padding:4px 11px;border-radius:999px;border:1px solid var(--border-strong);color:var(--text-dim)}.module-card{display:flex;gap:12px;align-items:flex-start;margin-bottom:10px;transition:border-color .15s,box-shadow .15s}.module-card.current{border-color:var(--accent);cursor:pointer}.module-card.current:hover{box-shadow:var(--shadow)}.module-card.done{cursor:pointer}.module-card.locked{opacity:.55}.module-badge{width:30px;height:30px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:var(--surface-3);color:var(--text-dim)}.module-card.current .module-badge{background:var(--accent-soft);color:var(--accent)}.module-card.done .module-badge{background:var(--accent);color:var(--accent-ink)}.suggestion-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:4px 0 10px}.suggestion-card{display:flex;flex-direction:column;gap:4px;text-align:left;padding:13px;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface);color:var(--text);cursor:pointer;transition:border-color .15s,background .15s,transform .06s}.suggestion-card:hover{border-color:var(--accent);background:var(--surface-2)}.suggestion-card:active{transform:scale(.98)}.suggestion-icon{font-size:22px}.suggestion-title{font-weight:600;font-size:14px}.suggestion-desc{font-size:12px;color:var(--text-dim);line-height:1.45}.or-divider{display:flex;align-items:center;gap:12px;text-align:center;color:var(--text-mute);font-size:12px;margin:16px 0 8px}.or-divider:before,.or-divider:after{content:"";flex:1;height:1px;background:var(--border)}.suggestion-loading-label{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-dim);margin:4px 0 10px}.suggestion-loading-label .spinner{color:var(--accent)}.suggestion-skeleton{cursor:default;gap:8px}.suggestion-skeleton:hover{border-color:var(--border-strong);background:var(--surface)}.material-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:8px}.material-upload{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--surface-2);color:var(--text);font-size:13px;font-weight:600;cursor:pointer;transition:border-color .15s,color .15s}.material-upload:hover{border-color:var(--accent);color:var(--accent)}.material-meta{display:inline-flex;align-items:center;gap:8px;font-size:12px}.material-clear{display:inline-flex;align-items:center;gap:4px;background:transparent;border:none;color:var(--text-mute);font-size:12px;cursor:pointer;padding:2px 4px;border-radius:6px}.material-clear:hover{color:var(--danger);background:var(--danger-soft)}.lab-list-item{display:flex;align-items:center;gap:12px;width:100%;text-align:left;margin:-4px 0 10px;padding:12px 14px;border:1px dashed var(--border-strong);background:var(--surface);color:var(--text);cursor:pointer;transition:border-color .15s,background .15s}.lab-list-item:hover{border-color:#0ea5e9;background:var(--surface-2)}.lab-list-item.done{border-style:solid;border-color:var(--accent)}.lab-list-badge{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;flex:none;border-radius:50%;background:#0ea5e926;color:#0ea5e9}.lab-list-item.done .lab-list-badge{background:var(--accent);color:var(--accent-ink)}.lab-list-text{flex:1;min-width:0;display:flex;flex-direction:column}.lab-list-text .muted{font-size:12px}.lab-list-item>svg{color:var(--text-mute);flex:none}.lab-card{margin-top:18px;border-color:var(--border-strong)}.lab-head{display:flex;align-items:center;gap:10px}.lab-badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;padding:5px 11px;border-radius:999px}.lab-vuln{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.lab-done{display:inline-flex;align-items:center;gap:4px;margin-left:auto;font-size:12px;font-weight:700;color:var(--success)}.lab-hints{margin:8px 0 0;padding-left:18px}.lab-hints li{margin-bottom:4px;font-size:14px;color:var(--text-dim);line-height:1.45}.lesson-card-kind{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;margin-bottom:8px}.lesson-head-right{display:inline-flex;align-items:center;gap:12px}.lesson-skip{background:transparent;border:none;color:var(--text-dim);font-size:13px;font-weight:600;cursor:pointer;padding:4px 6px;border-radius:8px;transition:color .15s,background .15s}.lesson-skip:hover{color:var(--text);background:var(--surface-2)}.recap{text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;margin:14px 0}.recap-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--text-mute);margin-bottom:10px}.recap-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}.recap-list li{display:flex;align-items:flex-start;gap:9px;font-size:14px;line-height:1.45}.recap-list li svg{color:var(--success);flex:none;margin-top:2px}