@import "https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600&family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap";:root{--font-heading:"Plus Jakarta Sans", sans-serif;--font-body:"Inter", sans-serif;--font-code:"Fira Code", monospace;--bg-dark:#090d16;--bg-card:#111827;--bg-card-hover:#1f293d;--bg-sidebar:#0d1322;--border-color:#ffffff14;--border-glow:#00add84d;--text-main:#f3f4f6;--text-muted:#9ca3af;--text-dim:#6b7280;--go-teal:#00add8;--go-teal-light:#38bdf8;--go-teal-glow:#00add840;--accent-cyan:#06b6d4;--accent-purple:#a855f7;--accent-green:#10b981;--accent-yellow:#f59e0b;--accent-red:#ef4444;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--shadow-glow:0 0 20px #00add826;--transition-fast:.2s ease;--transition-normal:.3s cubic-bezier(.4, 0, .2, 1)}[data-theme=light]{--bg-dark:#f8fafc;--bg-card:#fff;--bg-card-hover:#f1f5f9;--bg-sidebar:#f1f5f9;--border-color:#00000014;--border-glow:#00add866;--text-main:#0f172a;--text-muted:#475569;--text-dim:#94a3b8;--shadow-glow:0 4px 20px #00add81f}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-dark);color:var(--text-main);font-family:var(--font-body);-webkit-font-smoothing:antialiased;line-height:1.6;overflow-x:hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-dark)}::-webkit-scrollbar-thumb{background:#ffffff26;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--go-teal)}.glass-panel{-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-color);border-radius:var(--radius-md);background:#111827b3}[data-theme=light] .glass-panel{background:#ffffffd9}.app-container{flex-direction:column;min-height:100vh;display:flex}.main-layout{flex:1;width:100%;max-width:1600px;margin:0 auto;display:flex}.top-header{background:var(--bg-sidebar);border-bottom:1px solid var(--border-color);z-index:50;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);justify-content:space-between;align-items:center;height:70px;padding:0 1.5rem;display:flex;position:sticky;top:0}.brand-area{font-family:var(--font-heading);color:var(--text-main);cursor:pointer;align-items:center;gap:.75rem;font-size:1.25rem;font-weight:800;text-decoration:none;display:flex}.brand-logo-icon{background:linear-gradient(135deg, var(--go-teal), var(--accent-cyan));border-radius:var(--radius-sm);color:#fff;width:38px;height:38px;box-shadow:0 0 15px var(--go-teal-glow);justify-content:center;align-items:center;display:flex}.brand-tag{color:var(--go-teal-light);border:1px solid var(--border-glow);text-transform:uppercase;background:#00add826;border-radius:12px;padding:2px 8px;font-size:.7rem;font-weight:600}.header-actions{align-items:center;gap:1rem;display:flex}.btn-icon{border:1px solid var(--border-color);color:var(--text-main);border-radius:var(--radius-sm);cursor:pointer;width:40px;height:40px;transition:var(--transition-fast);background:#ffffff0d;justify-content:center;align-items:center;display:flex}.btn-icon:hover{border-color:var(--go-teal);color:var(--go-teal-light);background:#00add826}.search-trigger{border:1px solid var(--border-color);color:var(--text-muted);cursor:pointer;transition:var(--transition-fast);background:#ffffff0d;border-radius:20px;align-items:center;gap:.5rem;padding:.5rem 1rem;font-size:.875rem;display:flex}.search-trigger:hover{border-color:var(--go-teal);color:var(--text-main);background:#00add814}.kbd-shortcut{font-size:.75rem;font-family:var(--font-code);background:#ffffff1a;border-radius:4px;padding:2px 6px}.nav-tab-btn{border-radius:var(--radius-sm);color:var(--text-muted);cursor:pointer;transition:var(--transition-fast);background:0 0;border:none;align-items:center;gap:.5rem;padding:.5rem 1rem;font-size:.9rem;font-weight:600;display:flex}.nav-tab-btn:hover{color:var(--text-main);background:#ffffff0d}.nav-tab-btn.active{color:var(--go-teal-light);border:1px solid var(--border-glow);background:linear-gradient(135deg,#00add833,#06b6d433)}.sidebar{background:var(--bg-sidebar);border-right:1px solid var(--border-color);flex-direction:column;width:320px;height:calc(100vh - 70px);padding:1.25rem 1rem;display:flex;position:sticky;top:70px;overflow-y:auto}.progress-card{border:1px solid var(--border-glow);border-radius:var(--radius-md);background:#00add814;margin-bottom:1.25rem;padding:1rem}.progress-header{justify-content:space-between;align-items:center;margin-bottom:.5rem;font-size:.85rem;font-weight:600;display:flex}.progress-bar-bg{background:#ffffff1a;border-radius:4px;height:8px;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg, var(--go-teal), var(--accent-cyan));border-radius:4px;height:100%;transition:width .4s}.module-group{margin-bottom:.75rem}.module-title-btn{border:1px solid var(--border-color);border-radius:var(--radius-sm);width:100%;color:var(--text-main);font-family:var(--font-heading);cursor:pointer;text-align:left;transition:var(--transition-fast);background:#ffffff08;justify-content:space-between;align-items:center;padding:.75rem .85rem;font-size:.875rem;font-weight:700;display:flex}.module-title-btn:hover{background:#ffffff0f;border-color:#ffffff26}.module-lessons-list{flex-direction:column;gap:.25rem;margin-top:.35rem;padding-left:.5rem;display:flex}.lesson-item-btn{border-radius:var(--radius-sm);width:100%;color:var(--text-muted);cursor:pointer;text-align:left;transition:var(--transition-fast);background:0 0;border:none;align-items:center;gap:.6rem;padding:.55rem .75rem;font-size:.825rem;font-weight:500;display:flex}.lesson-item-btn:hover{color:var(--text-main);background:#ffffff0d}.lesson-item-btn.active{color:var(--go-teal-light);border-left:3px solid var(--go-teal);background:#00add826;font-weight:600}.lesson-check-icon{color:var(--accent-green);flex-shrink:0}.content-area{flex:1;max-width:960px;padding:2.5rem 3rem;overflow-y:auto}.lesson-header{border-bottom:1px solid var(--border-color);margin-bottom:2rem;padding-bottom:1.5rem}.lesson-meta-badges{align-items:center;gap:.75rem;margin-bottom:.75rem;display:flex}.badge{border-radius:12px;padding:3px 10px;font-size:.75rem;font-weight:600}.badge-tag{color:var(--go-teal-light);border:1px solid var(--border-glow);background:#00add81f}.badge-time{color:var(--text-muted);background:#ffffff0f}.lesson-main-title{font-family:var(--font-heading);background:linear-gradient(135deg, #fff 40%, var(--go-teal-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:.75rem;font-size:2.25rem;font-weight:800}.lesson-summary-lead{color:var(--text-muted);font-size:1.1rem;line-height:1.6}.section-block{margin-bottom:2.5rem}.section-block p{color:var(--text-main);margin-bottom:1rem;font-size:1rem}.section-block h3{font-family:var(--font-heading);color:var(--text-main);margin:1.5rem 0 1rem;font-size:1.35rem}.section-block h4{font-family:var(--font-heading);color:var(--go-teal-light);margin:1.2rem 0 .6rem;font-size:1.1rem}.callout-box{border-radius:var(--radius-md);border-left:4px solid;gap:1rem;margin:1.5rem 0;padding:1.25rem;display:flex}.callout-box.tip{border-color:var(--accent-green);background:#10b98114}.callout-box.info{border-color:var(--go-teal);background:#00add814}.callout-box.warning{border-color:var(--accent-yellow);background:#f59e0b14}.callout-box.important{border-color:var(--accent-purple);background:#a855f714}.callout-title{font-family:var(--font-heading);margin-bottom:.35rem;font-size:.95rem;font-weight:700}.code-container{border:1px solid var(--border-color);border-radius:var(--radius-md);background:#060911;margin:1.5rem 0;overflow:hidden;box-shadow:0 10px 30px #0000004d}.code-header-bar{border-bottom:1px solid var(--border-color);background:#0d1322;justify-content:space-between;align-items:center;padding:.6rem 1rem;display:flex}.code-lang-tag{font-family:var(--font-code);color:var(--go-teal-light);text-transform:uppercase;font-size:.75rem;font-weight:600}.code-actions-bar{gap:.5rem;display:flex}.btn-code-action{border:1px solid var(--border-color);color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition-fast);background:#ffffff0f;align-items:center;gap:.35rem;padding:4px 10px;font-size:.75rem;display:flex}.btn-code-action:hover{border-color:var(--go-teal);color:#fff;background:#00add833}.code-editor-body{font-family:var(--font-code);color:#e5e7eb;white-space:pre;padding:1.25rem;font-size:.9rem;line-height:1.5;overflow-x:auto}.code-simulated-output{border-top:1px solid var(--border-color);background:#0b1120;padding:1rem}.output-title{font-family:var(--font-code);color:var(--accent-green);align-items:center;gap:.4rem;margin-bottom:.5rem;font-size:.75rem;font-weight:600;display:flex}.output-terminal{font-family:var(--font-code);color:#a7f3d0;white-space:pre-wrap;font-size:.85rem}.breakdown-box{border:1px dashed var(--border-color);border-radius:var(--radius-sm);background:#ffffff05;margin-top:1rem;padding:1rem}.breakdown-title{font-family:var(--font-heading);color:var(--go-teal-light);margin-bottom:.75rem;font-size:.875rem;font-weight:700}.breakdown-item{margin-bottom:.6rem;font-size:.85rem}.breakdown-code-inline{font-family:var(--font-code);color:var(--accent-cyan);background:#00add81a;border-radius:4px;padding:2px 6px;font-weight:600}.comparison-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin:1.5rem 0;display:grid}.comparison-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1rem}.comparison-card-header{font-family:var(--font-heading);color:var(--go-teal-light);margin-bottom:.5rem;font-weight:700}.quiz-container{border:1px solid var(--border-glow);border-radius:var(--radius-lg);box-shadow:var(--shadow-glow);background:linear-gradient(135deg,#111827e6,#0d1322f2);margin-top:3rem;padding:2rem}.quiz-header{font-family:var(--font-heading);color:var(--text-main);align-items:center;gap:.75rem;margin-bottom:1.5rem;font-size:1.25rem;font-weight:700;display:flex}.quiz-options-list{flex-direction:column;gap:.75rem;display:flex}.quiz-option-btn{text-align:left;border:1px solid var(--border-color);border-radius:var(--radius-md);width:100%;color:var(--text-main);cursor:pointer;transition:var(--transition-fast);background:#ffffff08;padding:1rem 1.25rem;font-size:.95rem}.quiz-option-btn:hover{border-color:var(--go-teal);background:#00add81a}.quiz-option-btn.correct{font-weight:600;border-color:var(--accent-green)!important;color:#a7f3d0!important;background:#10b98126!important}.quiz-option-btn.wrong{border-color:var(--accent-red)!important;color:#fca5a5!important;background:#ef444426!important}.quiz-feedback-box{border-radius:var(--radius-md);margin-top:1.25rem;padding:1rem;font-size:.9rem}.quiz-feedback-box.correct{border:1px solid var(--accent-green);color:#a7f3d0;background:#10b9811a}.quiz-feedback-box.wrong{border:1px solid var(--accent-red);color:#fca5a5;background:#ef44441a}.lesson-footer-nav{border-top:1px solid var(--border-color);justify-content:space-between;margin-top:3rem;padding-top:1.5rem;display:flex}.btn-primary-go{background:linear-gradient(135deg, var(--go-teal), var(--accent-cyan));color:#fff;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition-fast);box-shadow:0 4px 15px var(--go-teal-glow);border:none;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.95rem;font-weight:700;display:flex}.btn-primary-go:hover{opacity:.9;transform:translateY(-2px)}.btn-secondary-go{border:1px solid var(--border-color);color:var(--text-main);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition-fast);background:#ffffff0d;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.95rem;font-weight:600;display:flex}.btn-secondary-go:hover{background:#ffffff1a}.modal-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;background:#000000b3;justify-content:center;align-items:flex-start;padding-top:10vh;display:flex;position:fixed;inset:0}.search-modal-card{background:var(--bg-card);border:1px solid var(--border-glow);border-radius:var(--radius-lg);width:90%;max-width:640px;overflow:hidden;box-shadow:0 20px 50px #00000080}.search-input-header{border-bottom:1px solid var(--border-color);align-items:center;gap:.75rem;padding:1rem 1.25rem;display:flex}.search-input-field{width:100%;color:var(--text-main);font-size:1.1rem;font-family:var(--font-body);background:0 0;border:none;outline:none}.search-results-list{max-height:400px;padding:.5rem;overflow-y:auto}.search-result-item{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition-fast);padding:.85rem 1rem}.search-result-item:hover{background:#00add81f}.search-result-title{color:var(--go-teal-light);font-size:.95rem;font-weight:700}.search-result-snippet{color:var(--text-muted);font-size:.825rem}@media (width<=1024px){.sidebar{z-index:40;transition:left .3s;position:fixed;left:-320px}.sidebar.open{left:0}.content-area{padding:1.5rem 1.25rem}}