:root{--color-primary: #ba1a1a;--color-primary-light: #e11d48;--color-primary-dark: #881337;--color-primary-glow: rgba(225, 29, 72, .15);--color-ai: #0284c7;--color-ai-glow: rgba(2, 132, 199, .2);--color-mobile: #e11d48;--color-mobile-glow: rgba(225, 29, 72, .2);--color-hci: #8b5cf6;--color-hci-glow: rgba(139, 92, 246, .2);--color-qlda: #f59e0b;--color-qlda-glow: rgba(245, 158, 11, .2);--bg-app: #090d16;--bg-surface: #0f172a;--bg-surface-elevated: #1e293b;--bg-surface-glass: rgba(15, 23, 42, .75);--bg-surface-translucent: rgba(30, 41, 59, .6);--bg-input: #131d31;--border-subtle: rgba(255, 255, 255, .08);--border-medium: rgba(255, 255, 255, .14);--border-strong: rgba(255, 255, 255, .22);--border-glow: rgba(56, 189, 248, .3);--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--text-inverse: #090d16;--text-accent: #38bdf8;--color-success: #10b981;--color-warning: #f59e0b;--color-danger: #ef4444;--color-info: #38bdf8;--font-sans: "Plus Jakarta Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", monospace;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px -1px rgba(0, 0, 0, .4), 0 2px 6px -1px rgba(0, 0, 0, .2);--shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, .5), 0 4px 10px -2px rgba(0, 0, 0, .3);--shadow-glow-primary: 0 0 25px rgba(225, 29, 72, .25);--shadow-glow-cyan: 0 0 25px rgba(56, 189, 248, .25);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-smooth: .35s cubic-bezier(.16, 1, .3, 1)}[data-theme=light]{--bg-app: #f8fafc;--bg-surface: #ffffff;--bg-surface-elevated: #f1f5f9;--bg-surface-glass: rgba(255, 255, 255, .85);--bg-surface-translucent: rgba(241, 245, 249, .8);--bg-input: #f1f5f9;--border-subtle: rgba(0, 0, 0, .08);--border-medium: rgba(0, 0, 0, .14);--border-strong: rgba(0, 0, 0, .25);--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--text-inverse: #ffffff;--text-accent: #0284c7;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px -1px rgba(0, 0, 0, .08), 0 2px 6px -1px rgba(0, 0, 0, .04);--shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, .1), 0 4px 10px -2px rgba(0, 0, 0, .05)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-primary);font-size:16px;line-height:1.6;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth}body{min-height:100vh;display:flex;flex-direction:column;background:radial-gradient(circle at 50% 0%,rgba(30,58,138,.12) 0%,transparent 60%),radial-gradient(circle at 10% 40%,rgba(225,29,72,.06) 0%,transparent 40%),var(--bg-app);background-attachment:fixed;overflow-x:hidden}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.25;color:var(--text-primary);letter-spacing:-.02em}h1{font-size:2.5rem}h2{font-size:1.85rem}h3{font-size:1.35rem}h4{font-size:1.1rem}p{color:var(--text-secondary);margin-bottom:1rem}p:last-child{margin-bottom:0}a{color:var(--text-accent);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:#60a5fa}code,kbd,samp,pre{font-family:var(--font-mono)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-app)}::-webkit-scrollbar-thumb{background:var(--border-medium);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--border-strong)}.container{width:100%;max-width:1280px;margin:0 auto;padding:0 1.5rem}.container-narrow{width:100%;max-width:900px;margin:0 auto;padding:0 1.5rem}.container-wide{width:100%;max-width:1440px;margin:0 auto;padding:0 1.5rem}.text-gradient-primary{background:linear-gradient(135deg,#fff,#cbd5e1,#94a3b8);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.text-gradient-brand{background:linear-gradient(135deg,#f43f5e,#fb7185,#fda4af);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.text-gradient-cyan{background:linear-gradient(135deg,#38bdf8,#818cf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.glass-panel{background:var(--bg-surface-glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-subtle);border-radius:var(--radius-lg)}.glass-panel-elevated{background:var(--bg-surface-translucent);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-medium);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.625rem 1.25rem;font-size:.925rem;font-weight:600;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn-primary{background:linear-gradient(135deg,#ba1a1a,#e11d48);color:#fff;box-shadow:0 4px 14px #e11d4859}.btn-primary:hover{background:linear-gradient(135deg,#9f1239,#be123c);box-shadow:0 6px 20px #e11d4873;transform:translateY(-1px);color:#fff}.btn-secondary{background:var(--bg-surface-elevated);border-color:var(--border-medium);color:var(--text-primary)}.btn-secondary:hover{background:var(--bg-input);border-color:var(--border-strong);color:#fff;transform:translateY(-1px)}.btn-outline{background:transparent;border-color:var(--border-medium);color:var(--text-primary)}.btn-outline:hover{background:#ffffff0d;border-color:var(--border-strong)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:#ffffff0d;color:var(--text-primary)}.btn-sm{padding:.375rem .75rem;font-size:.815rem;border-radius:var(--radius-sm)}.btn-lg{padding:.875rem 1.75rem;font-size:1.05rem;border-radius:var(--radius-lg)}.badge{display:inline-flex;align-items:center;gap:.375rem;padding:.25rem .625rem;font-size:.75rem;font-weight:600;border-radius:var(--radius-full);letter-spacing:.02em;text-transform:uppercase}.badge-vku{background:#ba1a1a26;color:#f87171;border:1px solid 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var(--transition-fast)}.navbar-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;width:100%}.nav-brand{display:flex;align-items:center;gap:.625rem;text-decoration:none;color:var(--text-primary);white-space:nowrap;flex-shrink:0;-webkit-user-select:none;user-select:none}.nav-brand-logo{width:32px;height:32px;border-radius:var(--radius-sm);object-fit:contain;background:#ffffff0a;padding:2px;border:1px solid var(--border-medium);transition:transform var(--transition-fast)}.nav-brand:hover .nav-brand-logo{transform:scale(1.05)}.nav-brand-title{display:flex;align-items:baseline;gap:.4rem;white-space:nowrap}.nav-brand-title strong{font-weight:700;font-size:1rem;letter-spacing:-.01em;color:var(--text-primary)}.nav-brand-title span{font-size:.725rem;font-weight:600;color:var(--text-accent);background:#38bdf81a;padding:.1rem .4rem;border-radius:var(--radius-sm);border:1px solid 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var(--transition-fast)}.search-trigger-btn:hover{background:var(--bg-surface-elevated);border-color:var(--text-accent);color:var(--text-primary)}.search-kbd{font-family:var(--font-mono);font-size:.675rem;background:var(--bg-surface-elevated);padding:.1rem .35rem;border-radius:var(--radius-sm);border:1px solid var(--border-medium);color:var(--text-muted)}.mobile-toggle-btn{display:none;align-items:center;justify-content:center;width:36px;height:36px;padding:0;border-radius:var(--radius-md);background:var(--bg-surface);border:1px solid var(--border-medium);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast)}.mobile-toggle-btn:hover{background:var(--bg-surface-elevated);border-color:var(--text-accent)}@media(max-width:1024px){.mobile-toggle-btn{display:inline-flex!important}}.mobile-drawer-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#000000a6;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);animation:fadeIn .2s 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.5rem;padding-bottom:env(safe-area-inset-bottom,0)}@media(max-width:768px){.mobile-bottom-nav{display:flex}body{padding-bottom:60px}}.mobile-nav-tab{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.2rem;background:transparent;border:none;color:var(--text-muted);font-size:.675rem;font-weight:600;cursor:pointer;padding:.35rem .6rem;border-radius:var(--radius-sm);transition:all var(--transition-fast);text-decoration:none;position:relative}.mobile-nav-tab.active{color:#38bdf8}.mobile-nav-tab.active:after{content:"";position:absolute;bottom:2px;width:16px;height:2px;background:#38bdf8;border-radius:99px;box-shadow:0 0 8px #38bdf8}.footer{margin-top:auto;background:var(--bg-surface);border-top:1px solid var(--border-subtle);padding:3rem 0 2rem}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:2.5rem;margin-bottom:2.5rem}.footer-heading{font-size:.875rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text-primary);margin-bottom:1rem}.footer-links{list-style:none;display:flex;flex-direction:column;gap:.625rem}.footer-link{font-size:.875rem;color:var(--text-muted);transition:color var(--transition-fast);text-decoration:none}.footer-link:hover{color:var(--text-primary)}.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:1.5rem;border-top:1px solid var(--border-subtle);font-size:.8125rem;color:var(--text-muted)}.hero-section{padding:4.5rem 0 3.5rem;position:relative;overflow:hidden}.hero-badge-container{display:flex;align-items:center;gap:.75rem;margin-bottom:1.25rem}.hero-title{font-size:3rem;font-weight:800;line-height:1.15;margin-bottom:1.25rem}.hero-subtitle{font-size:1.15rem;line-height:1.6;color:var(--text-secondary);max-width:780px;margin-bottom:2rem}.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin-top:2.5rem}.stat-card{background:var(--bg-surface-glass);border:1px solid var(--border-subtle);padding:1.25rem;border-radius:var(--radius-lg);display:flex;flex-direction:column;gap:.25rem;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);transition:all var(--transition-normal)}.stat-card:hover{border-color:var(--border-glow);transform:translateY(-2px)}.stat-number{font-size:2rem;font-weight:800;color:var(--text-primary);line-height:1}.stat-label{font-size:.825rem;color:var(--text-muted);font-weight:500}.courses-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.75rem;margin-top:2rem}.course-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);overflow:hidden;display:flex;flex-direction:column;transition:all var(--transition-smooth);position:relative}.course-card:hover{border-color:var(--card-accent, var(--border-medium));box-shadow:0 12px 30px -5px #0006;transform:translateY(-4px)}.course-card-header{padding:1.75rem 1.75rem 1rem;border-bottom:1px solid var(--border-subtle);background:linear-gradient(180deg,var(--card-glow, rgba(255, 255, 255, .02)) 0%,transparent 100%)}.course-card-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.course-card-code{font-family:var(--font-mono);font-size:.75rem;font-weight:700;color:var(--text-muted);letter-spacing:.05em}.course-card-title{font-size:1.4rem;font-weight:700;margin-bottom:.35rem;color:var(--text-primary)}.course-card-eng{font-size:.875rem;color:var(--text-secondary);font-weight:500;margin-bottom:.75rem}.course-card-body{padding:1.5rem 1.75rem;flex-grow:1;display:flex;flex-direction:column;gap:1.25rem}.course-card-desc{font-size:.925rem;color:var(--text-secondary);line-height:1.6}.course-card-info-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.75rem;background:var(--bg-app);padding:.875rem;border-radius:var(--radius-md);border:1px solid var(--border-subtle)}.course-info-item{display:flex;align-items:center;gap:.5rem;font-size:.8125rem;color:var(--text-secondary)}.course-info-item svg{color:var(--text-muted);flex-shrink:0}.course-card-footer{padding:1.25rem 1.75rem;border-top:1px solid var(--border-subtle);background:#0003;display:flex;align-items:center;justify-content:space-between}.tabs-container{display:flex;align-items:center;gap:.5rem;border-bottom:1px solid var(--border-medium);margin-bottom:2rem;overflow-x:auto;padding-bottom:2px}.tab-btn{display:flex;align-items:center;gap:.5rem;padding:.75rem 1.25rem;font-size:.925rem;font-weight:600;color:var(--text-secondary);background:transparent;border:none;border-bottom:2px solid transparent;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{color:var(--active-tab-color, var(--text-accent));border-bottom-color:var(--active-tab-color, var(--text-accent))}.week-timeline{display:flex;flex-direction:column;gap:1rem}.week-card{background:var(--bg-surface);border:1px solid 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var(--border-subtle);margin-top:.5rem;background:#00000026}.week-topics-list{display:flex;flex-wrap:wrap;gap:.5rem;margin:.875rem 0 1.25rem}.topic-chip{font-size:.8125rem;padding:.25rem .625rem;background:var(--bg-surface-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-secondary)}.week-actions{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.slide-viewer-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#05080feb;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);display:flex;flex-direction:column}.slide-viewer-header{padding:.875rem 1.5rem;border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between;background:var(--bg-surface)}.slide-viewer-content{flex-grow:1;display:flex;overflow:hidden}.slide-sidebar{width:280px;border-right:1px solid var(--border-subtle);background:var(--bg-surface);overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.5rem}.slide-thumb-item{padding:.75rem;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-surface-elevated);cursor:pointer;font-size:.8125rem;transition:all var(--transition-fast)}.slide-thumb-item:hover,.slide-thumb-item.active{border-color:var(--text-accent);background:#38bdf81a}.slide-main-stage{flex-grow:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;overflow-y:auto;position:relative}.slide-canvas{width:100%;max-width:1000px;aspect-ratio:16 / 9;background:#0f172a;border:1px solid var(--border-medium);border-radius:var(--radius-lg);padding:3rem;box-shadow:var(--shadow-lg);display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}.slide-footer-controls{padding:.875rem 2rem;border-top:1px solid var(--border-subtle);background:var(--bg-surface);display:flex;align-items:center;justify-content:space-between}.book-layout{display:grid;grid-template-columns:300px 1fr;gap:2rem;padding:2rem 0 4rem}.book-sidebar{position:sticky;top:5rem;height:calc(100vh - 7rem);overflow-y:auto;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:1.25rem;display:flex;flex-direction:column;gap:.5rem}.book-chapter-link{display:flex;flex-direction:column;padding:.75rem 1rem;border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition-fast);cursor:pointer;border:1px solid transparent}.book-chapter-link:hover{background:var(--bg-surface-elevated);color:var(--text-primary)}.book-chapter-link.active{background:#e11d481a;border-color:#e11d484d;color:#fb7185}.book-content-view{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);padding:3rem;min-height:80vh}.search-modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#05080fd9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);display:flex;align-items:flex-start;justify-content:center;padding-top:10vh}.search-modal-card{width:100%;max-width:680px;background:var(--bg-surface-elevated);border:1px solid var(--border-medium);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);overflow:hidden}.search-modal-input-wrapper{display:flex;align-items:center;gap:.875rem;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border-medium);background:var(--bg-surface)}.search-modal-input{flex-grow:1;background:transparent;border:none;font-size:1.15rem;color:var(--text-primary);outline:none;font-family:var(--font-sans)}.search-modal-results{max-height:450px;overflow-y:auto;padding:.75rem;display:flex;flex-direction:column;gap:.375rem}.search-result-row{padding:.875rem 1rem;border-radius:var(--radius-md);background:transparent;border:1px solid transparent;cursor:pointer;display:flex;flex-direction:column;gap:.25rem;transition:all var(--transition-fast)}.search-result-row:hover,.search-result-row.selected{background:var(--bg-input);border-color:var(--border-strong)}.callout{padding:1rem 1.25rem;border-radius:var(--radius-md);margin:1.25rem 0;border-left:4px solid;font-size:.95rem;line-height:1.6}.callout-note{background:#38bdf814;border-color:#38bdf8;color:var(--text-primary)}.callout-tip{background:#10b98114;border-color:#10b981;color:var(--text-primary)}.callout-warning{background:#f59e0b14;border-color:#f59e0b;color:var(--text-primary)}.callout-important{background:#e11d4814;border-color:#e11d48;color:var(--text-primary)}.code-block-wrapper{margin:1.25rem 0;border-radius:var(--radius-md);overflow:hidden;background:#090d16;border:1px solid var(--border-medium)}.code-block-header{padding:.5rem 1rem;background:#111827;border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between;font-family:var(--font-mono);font-size:.75rem;color:var(--text-muted)}.code-block-pre{padding:1.25rem;overflow-x:auto;font-family:var(--font-mono);font-size:.875rem;line-height:1.7;color:#e2e8f0}@media(max-width:1024px){.courses-grid{grid-template-columns:1fr}.hero-stats{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr 1fr}.book-layout{grid-template-columns:1fr}.book-sidebar{position:static;height:auto}}@media(max-width:640px){.hero-title{font-size:2rem}.hero-stats,.footer-grid{grid-template-columns:1fr}.nav-menu,.slide-sidebar{display:none}.book-content-view{padding:1.5rem}}