:root{--bg-primary:#070b14;--bg-secondary:#0f172a;--bg-surface:#172033;--bg-surface-2:#1e293b;--bg-elevated:#24344d;--bg-hover:#334460;--border-color:#273854;--border-subtle:#192437;--border-accent:#38bdf8;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--text-inverse:#070b14;--color-primary:#38bdf8;--color-primary-hover:#0284c7;--color-primary-subtle:#38bdf824;--color-success:#10b981;--color-success-hover:#059669;--color-success-subtle:#10b98129;--color-warning:#f59e0b;--color-warning-hover:#d97706;--color-warning-subtle:#f59e0b29;--color-danger:#ef4444;--color-danger-hover:#dc2626;--color-danger-subtle:#ef444429;--color-purple:#c084fc;--color-purple-hover:#9333ea;--color-purple-subtle:#c084fc29;--color-indigo:#818cf8;--color-indigo-subtle:#818cf829;--svg-canvas-bg:#0b1120;--svg-node-bg:#1e293b;--svg-stroke:#38bdf8;--svg-text-main:#f8fafc;--svg-text-muted:#94a3b8;--font-sans:"Plus Jakarta Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;--font-size-xs:.75rem;--font-size-sm:.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:1.875rem;--font-size-4xl:2.25rem;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--sidebar-width:260px;--content-max-width:1080px;--header-height:64px;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--shadow-sm:0 1px 2px 0 #00000040;--shadow-md:0 4px 6px -1px #00000059, 0 2px 4px -2px #0000004d;--shadow-lg:0 10px 15px -3px #00000073, 0 4px 6px -4px #00000059;--shadow-glow:0 0 20px #38bdf840;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-normal:.25s cubic-bezier(.4, 0, .2, 1)}[data-theme=light]{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-surface:#f1f5f9;--bg-elevated:#e2e8f0;--bg-hover:#cbd5e1;--border-color:#cbd5e1;--border-subtle:#e2e8f0;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--text-inverse:#f8fafc;--color-primary:#0284c7;--color-primary-hover:#0369a1;--color-primary-subtle:#0284c71f;--color-success:#059669;--color-success-subtle:#0596691f;--color-warning:#d97706;--color-warning-subtle:#d977061f;--color-danger:#dc2626;--color-danger-subtle:#dc26261f;--color-purple:#9333ea;--color-purple-subtle:#9333ea1f;--color-indigo:#4f46e5;--color-indigo-subtle:#4f46e51f;--svg-canvas-bg:#f8fafc;--svg-node-bg:#fff;--svg-stroke:#0284c7;--svg-text-main:#0f172a;--svg-text-muted:#475569;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #00000014, 0 2px 4px -2px #0000000d;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000000f;--shadow-glow:0 0 20px #0284c726}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;transition:background-color var(--transition-normal), color var(--transition-normal);line-height:1.6;overflow-x:hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}h1,h2,h3,h4,h5,h6{color:var(--text-primary);font-weight:700;line-height:1.25}h1{font-size:var(--font-size-3xl);letter-spacing:-.025em}h2{font-size:var(--font-size-2xl);letter-spacing:-.02em}h3{font-size:var(--font-size-xl);letter-spacing:-.015em}h4{font-size:var(--font-size-lg)}p{color:var(--text-secondary);margin-bottom:var(--space-3)}a{color:var(--color-primary);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--color-primary-hover);text-decoration:underline}code,pre{font-family:var(--font-mono);font-size:.9em}#app{min-height:100vh;display:flex;position:relative}#sidebar{width:var(--sidebar-width);background-color:var(--bg-secondary);border-right:1px solid var(--border-color);z-index:100;transition:transform var(--transition-normal);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0}.sidebar-header{padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;display:flex}.brand-badge{align-items:center;gap:var(--space-3);display:flex}.brand-icon{background:linear-gradient(135deg, var(--color-primary), var(--color-purple));border-radius:var(--radius-md);color:#fff;width:32px;height:32px;font-weight:800;font-size:var(--font-size-base);justify-content:center;align-items:center;display:flex}.brand-title{font-size:var(--font-size-sm);color:var(--text-primary);font-weight:700;line-height:1.2}.brand-sub{font-size:var(--font-size-xs);color:var(--color-primary);font-weight:600}.sidebar-nav{padding:var(--space-3) var(--space-2);flex:1;overflow-y:auto}.nav-section-title{font-size:var(--font-size-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);padding:var(--space-2) var(--space-3);margin-top:var(--space-2);font-weight:700}.nav-item{align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-3);color:var(--text-secondary);font-size:var(--font-size-sm);border-radius:var(--radius-md);transition:all var(--transition-fast);cursor:pointer;-webkit-user-select:none;user-select:none;margin-bottom:2px;font-weight:500;text-decoration:none;display:flex}.nav-item:hover{background-color:var(--bg-surface);color:var(--text-primary);text-decoration:none}.nav-item.active{background-color:var(--color-primary-subtle);color:var(--color-primary);font-weight:600}.nav-item-icon{text-align:center;width:20px;font-size:1.1rem}.sidebar-footer{padding:var(--space-3) var(--space-4);border-top:1px solid var(--border-color);background-color:var(--bg-surface);font-size:var(--font-size-xs);justify-content:space-between;align-items:center;display:flex}#main-wrapper{margin-left:var(--sidebar-width);flex-direction:column;flex:1;min-width:0;min-height:100vh;display:flex}#topbar{height:var(--header-height);background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);padding:0 var(--space-6);z-index:90;justify-content:space-between;align-items:center;display:flex;position:sticky;top:0}.topbar-left{align-items:center;gap:var(--space-4);display:flex}.menu-toggle-btn{border:1px solid var(--border-color);color:var(--text-primary);padding:var(--space-2);border-radius:var(--radius-md);cursor:pointer;background:0 0;display:none}.search-trigger-btn{align-items:center;gap:var(--space-2);background-color:var(--bg-surface);border:1px solid var(--border-color);color:var(--text-muted);font-size:var(--font-size-sm);padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);display:flex}.search-trigger-btn:hover{border-color:var(--color-primary);color:var(--text-primary)}.kbd-shortcut{background-color:var(--bg-elevated);border:1px solid var(--border-color);border-radius:var(--radius-sm);font-size:var(--font-size-xs);font-family:var(--font-mono);color:var(--text-secondary);padding:1px 5px}.topbar-right{align-items:center;gap:var(--space-3);display:flex}#content-container{padding:var(--space-6);max-width:var(--content-max-width);flex:1;width:100%;margin:0 auto}body.focus-mode #sidebar{transform:translate(-100%)}body.focus-mode #main-wrapper{margin-left:0}body.focus-mode #topbar{opacity:.25;transition:opacity var(--transition-normal)}body.focus-mode #topbar:hover{opacity:1}.btn{justify-content:center;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);font-size:var(--font-size-sm);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);border:1px solid #0000;font-weight:600;line-height:1.4;text-decoration:none;display:inline-flex}.btn:hover{text-decoration:none}.btn-primary{background-color:var(--color-primary);color:var(--text-inverse)}.btn-primary:hover{background-color:var(--color-primary-hover)}.btn-secondary{background-color:var(--bg-surface);color:var(--text-primary);border-color:var(--border-color)}.btn-secondary:hover{background-color:var(--bg-hover);border-color:var(--text-muted)}.btn-success{background-color:var(--color-success);color:#fff}.btn-success:hover{filter:brightness(1.1)}.btn-sm{padding:var(--space-1) var(--space-2);font-size:var(--font-size-xs)}.btn-icon{border-radius:var(--radius-md);background:var(--bg-surface);border:1px solid var(--border-color);width:36px;height:36px;color:var(--text-primary);padding:0}.btn-icon:hover{background:var(--bg-hover)}.card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-5);margin-bottom:var(--space-5);box-shadow:var(--shadow-sm)}.card-header{margin-bottom:var(--space-4);padding-bottom:var(--space-3);border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:center;display:flex}.card-title{font-size:var(--font-size-lg);align-items:center;gap:var(--space-2);font-weight:700;display:flex}.badge{font-size:var(--font-size-xs);border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.04em;align-items:center;gap:4px;padding:2px 8px;font-weight:700;display:inline-flex}.badge-primary{background:var(--color-primary-subtle);color:var(--color-primary)}.badge-success{background:var(--color-success-subtle);color:var(--color-success)}.badge-warning{background:var(--color-warning-subtle);color:var(--color-warning)}.badge-danger{background:var(--color-danger-subtle);color:var(--color-danger)}.badge-purple{background:var(--color-purple-subtle);color:var(--color-purple)}.callout{border-left:4px solid var(--color-primary);background-color:var(--bg-surface);padding:var(--space-4);border-radius:0 var(--radius-md) var(--radius-md) 0;margin:var(--space-4) 0}.callout-header{font-weight:700;font-size:var(--font-size-sm);align-items:center;gap:var(--space-2);margin-bottom:var(--space-2);display:flex}.callout-memorize{border-left-color:var(--color-danger)}.callout-memorize .callout-header{color:var(--color-danger)}.callout-understand{border-left-color:var(--color-primary)}.callout-understand .callout-header{color:var(--color-primary)}.callout-exam-tip{border-left-color:var(--color-warning)}.callout-exam-tip .callout-header{color:var(--color-warning)}.callout-mistake{border-left-color:var(--color-purple)}.callout-mistake .callout-header{color:var(--color-purple)}.code-container{margin:var(--space-4) 0;border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:#0d1117;position:relative;overflow:hidden}.code-header{padding:var(--space-2) var(--space-4);border-bottom:1px solid var(--border-color);font-size:var(--font-size-xs);color:var(--text-muted);background-color:#161b22;justify-content:space-between;align-items:center;display:flex}.code-pre{padding:var(--space-4);font-family:var(--font-mono);font-size:var(--font-size-sm);color:#e6edf3;line-height:1.5;overflow-x:auto}.copy-code-btn{border:1px solid var(--border-color);color:var(--text-secondary);font-size:var(--font-size-xs);border-radius:var(--radius-sm);cursor:pointer;background:0 0;padding:2px 8px}.copy-code-btn:hover{background:var(--bg-hover);color:#fff}.table-responsive{width:100%;margin:var(--space-4) 0;border:1px solid var(--border-color);border-radius:var(--radius-md);overflow-x:auto}.study-table{border-collapse:collapse;text-align:left;width:100%;font-size:var(--font-size-sm)}.study-table th{background-color:var(--bg-surface);color:var(--text-primary);padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--border-color);font-weight:700}.study-table td{padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--border-subtle);color:var(--text-secondary)}.study-table tr:last-child td{border-bottom:none}.study-table tr:hover td{background-color:var(--color-primary-subtle)}.diagram-box{border:1px solid var(--border-color);border-radius:var(--radius-md);padding:var(--space-4);font-family:var(--font-mono);color:#38bdf8;margin:var(--space-4) 0;background-color:#050811;font-size:.8rem;line-height:1.35;overflow-x:auto}.svg-diagram-wrapper{background-color:var(--svg-canvas-bg,#0b1120);border:1px solid var(--border-color);border-radius:var(--radius-lg);margin:var(--space-4) 0;box-shadow:var(--shadow-md);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);overflow:hidden}.svg-diagram-wrapper:hover{border-color:var(--color-primary);box-shadow:var(--shadow-glow)}.svg-diagram-header{align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-4);background-color:var(--bg-surface);border-bottom:1px solid var(--border-color);display:flex}.svg-tag{letter-spacing:.05em;border-radius:var(--radius-full);background:var(--color-primary-subtle);color:var(--color-primary);text-transform:uppercase;padding:2px 8px;font-size:.65rem;font-weight:800}.svg-title{font-size:var(--font-size-xs);color:var(--text-primary);font-weight:700}.interactive-study-svg{width:100%;height:auto;font-family:var(--font-sans);display:block}.svg-node{transition:transform var(--transition-fast), filter var(--transition-fast);cursor:pointer}.svg-node:hover{filter:brightness(1.15)drop-shadow(0 6px 12px #38bdf859)}.diagram-toggle-bar{justify-content:flex-end;align-items:center;gap:var(--space-2);margin-bottom:var(--space-2);display:flex}.diagram-toggle-btn{font-size:var(--font-size-xs);border-radius:var(--radius-sm);background:var(--bg-surface-2);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);padding:4px 10px}.diagram-toggle-btn.active{background:var(--color-primary);color:var(--text-inverse);border-color:var(--color-primary);font-weight:700}.quiz-card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-5);margin-bottom:var(--space-4)}.quiz-question{color:var(--text-primary);margin-bottom:var(--space-4);font-weight:600;font-size:var(--font-size-base)}.quiz-answer-block{margin-top:var(--space-3);padding:var(--space-3);background-color:var(--bg-secondary);border-left:3px solid var(--color-success);border-radius:var(--radius-sm);display:none}.quiz-answer-block.visible{display:block}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:200;opacity:0;pointer-events:none;transition:opacity var(--transition-fast);background:#000000bf;justify-content:center;align-items:flex-start;padding-top:10vh;display:flex;position:fixed;inset:0}.modal-overlay.active{opacity:1;pointer-events:auto}.command-palette{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);width:90%;max-width:640px;box-shadow:var(--shadow-lg), var(--shadow-glow);overflow:hidden}.palette-input-wrapper{padding:var(--space-4);border-bottom:1px solid var(--border-color);align-items:center;gap:var(--space-3);display:flex}.palette-input{font-size:var(--font-size-lg);color:var(--text-primary);background:0 0;border:none;outline:none;flex:1}.palette-results{max-height:400px;padding:var(--space-2);overflow-y:auto}.palette-item{padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);cursor:pointer;color:var(--text-secondary);font-size:var(--font-size-sm);justify-content:space-between;align-items:center;display:flex}.palette-item:hover,.palette-item.selected{background-color:var(--color-primary-subtle);color:var(--color-primary)}.tabs-header{gap:var(--space-2);border-bottom:1px solid var(--border-color);margin-bottom:var(--space-4);scroll-behavior:smooth;-webkit-overflow-scrolling:touch;display:flex;overflow-x:auto}.day-toc-bar{scrollbar-width:thin;scrollbar-color:var(--border-color) transparent}.day-toc-bar::-webkit-scrollbar{height:4px}.day-toc-bar::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-sm)}.tab-btn{padding:var(--space-2) var(--space-4);color:var(--text-muted);font-size:var(--font-size-sm);cursor:pointer;white-space:nowrap;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none;background:0 0;border:none;border-bottom:2px solid #0000;flex-shrink:0;font-weight:600}.tab-btn:hover{color:var(--text-primary);background-color:var(--bg-surface-2);border-radius:var(--radius-sm) var(--radius-sm) 0 0}.tab-btn.active{color:var(--color-primary);border-bottom-color:var(--color-primary);font-weight:700}section[id^=sec-],#sec-acad,#sec-pyq,#sec-apt-lesson,#sec-apt-solved,#sec-apt-mcq,#sec-dsa-pattern,#sec-coding-probs,#sec-core-cs,#sec-proj-defense,#sec-interview-prep,#sec-revision,#sec-mixed-test,#sec-coding-task,#sec-sign-off{scroll-margin-top:130px}.sidebar-backdrop{z-index:99;opacity:0;pointer-events:none;transition:opacity var(--transition-normal);background:#000000b3;position:fixed;inset:0}.sidebar-backdrop.active{opacity:1;pointer-events:auto}@media (width<=1024px){:root{--sidebar-width:240px;--content-max-width:100%}#content-container{padding:var(--space-5)}}@media (width<=768px){:root{--sidebar-width:280px;--header-height:56px}#sidebar{box-shadow:var(--shadow-lg);transform:translate(-100%)}#sidebar.drawer-open{transform:translate(0)}#main-wrapper{margin-left:0}.menu-toggle-btn{justify-content:center;align-items:center;display:flex}#topbar{padding:0 var(--space-4)}.kbd-shortcut,.search-trigger-btn span.label-text{display:none}#content-container{padding:var(--space-4)}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr!important}.dashboard-stats-grid{grid-template-columns:1fr 1fr!important}.card{padding:var(--space-4);margin-bottom:var(--space-4)}h1{font-size:var(--font-size-2xl)}h2{font-size:var(--font-size-xl)}h3{font-size:var(--font-size-lg)}}@media (width<=480px){:root{--font-size-base:.9375rem}#content-container{padding:var(--space-3)}.dashboard-stats-grid{grid-template-columns:1fr!important}.card-header{align-items:flex-start;gap:var(--space-2);flex-direction:column}.topbar-right .btn-text-label{display:none}.code-pre{padding:var(--space-3);font-size:.8rem}.diagram-box{padding:var(--space-3);font-size:.7rem}.btn{justify-content:center;width:100%;min-height:44px}.btn-inline{width:auto}.quiz-card{padding:var(--space-4)}.tabs-header{padding-bottom:var(--space-2)}.tab-btn{padding:var(--space-2) var(--space-3);font-size:var(--font-size-xs)}}@media (width<=340px){.brand-title{font-size:.8rem}.diagram-box{font-size:.65rem}}@media print{@page{size:A4;margin:18mm 15mm}html,body{color:#000!important;background:#fff!important;font-size:11pt!important;line-height:1.45!important}#sidebar,#topbar,.sidebar-backdrop,.modal-overlay,.btn,.menu-toggle-btn,.search-trigger-btn,.copy-code-btn,.timer-pill,.theme-toggle-btn{display:none!important}#main-wrapper{width:100%!important;margin-left:0!important}#content-container{max-width:100%!important;margin:0!important;padding:0!important}h1,h2,h3,h4{page-break-after:avoid;break-after:avoid;color:#000!important}h1{border-bottom:2pt solid #000;margin-bottom:12pt;padding-bottom:4pt;font-size:20pt!important}h2{border-bottom:1pt solid #666;margin-top:14pt;margin-bottom:8pt;padding-bottom:3pt;font-size:15pt!important}h3{margin-top:10pt;margin-bottom:4pt;font-size:12pt!important}p{color:#111!important}.card{page-break-inside:avoid;break-inside:avoid;box-shadow:none!important;background:#fff!important;border:1pt solid #ccc!important;margin-bottom:12pt!important;padding:10pt!important}.callout{page-break-inside:avoid;break-inside:avoid;color:#000!important;background:#f8f9fa!important;border-left:3pt solid #333!important;padding:8pt!important}.callout-header{font-weight:700;color:#000!important}.code-container{page-break-inside:avoid;break-inside:avoid;background:#f4f6f8!important;border:1pt solid #bbb!important}.code-header{color:#333!important;background:#eaecef!important;border-bottom:1pt solid #bbb!important}.code-pre{color:#111!important;white-space:pre-wrap!important;padding:8pt!important;font-size:9pt!important}.table-responsive{page-break-inside:avoid;break-inside:avoid;border:1pt solid #999!important;overflow:visible!important}.study-table th{color:#000!important;background:#e5e7eb!important;border-bottom:1.5pt solid #000!important;font-weight:700!important}.study-table td{color:#111!important;border-bottom:.5pt solid #ccc!important}.diagram-box{page-break-inside:avoid;break-inside:avoid;color:#000!important;background:#fff!important;border:1.5pt solid #000!important;padding:8pt!important;font-size:8pt!important}.quiz-answer-block{color:#000!important;background:#f1f5f9!important;border-left:2pt solid #059669!important;display:block!important}.day-page-break{page-break-before:always;break-before:page}.resume-paper{box-shadow:none!important;border:none!important;width:100%!important;margin:0!important;padding:0!important}}
