@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap";:root{--bg-base: #080c14;--bg-surface: #0d1322;--bg-surface-raised: #131b2e;--bg-surface-overlay: #1a243b;--accent-primary: #2563eb;--accent-hover: #3b82f6;--accent-cyan: #06b6d4;--accent-glow: rgba(59, 130, 246, .18);--accent-cyan-glow: rgba(6, 182, 212, .18);--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--text-accent: #60a5fa;--border-subtle: rgba(255, 255, 255, .08);--border-medium: rgba(255, 255, 255, .14);--border-highlight: rgba(59, 130, 246, .45);--border-focus: #3b82f6;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--radius-xs: 4px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--space-16: 64px;--space-20: 80px;--transition-fast: .15s ease;--transition-smooth: .25s cubic-bezier(.16, 1, .3, 1);--transition-spring: .35s cubic-bezier(.34, 1.56, .64, 1);--shadow-card: 0 4px 20px -2px rgba(0, 0, 0, .5);--shadow-card-hover: 0 16px 32px -8px rgba(0, 0, 0, .6), 0 0 24px -4px var(--accent-glow);--shadow-modal: 0 24px 48px -12px rgba(0, 0, 0, .8), 0 0 40px -8px var(--accent-glow)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;color-scheme:dark}body{background-color:var(--bg-base);color:var(--text-primary);font-family:var(--font-sans);font-size:1rem;line-height:1.65;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;min-height:100vh;display:flex;flex-direction:column}.bg-glow-container{position:fixed;top:0;left:0;right:0;height:600px;background:radial-gradient(circle at 50% -100px,rgba(37,99,235,.15) 0%,rgba(6,182,212,.05) 50%,transparent 80%);pointer-events:none;z-index:0}.container{max-width:1200px;margin:0 auto;padding:0 var(--space-6);position:relative;z-index:1}.container-narrow{width:100%;max-width:800px;min-width:0;margin:0 auto;padding:0 var(--space-6);position:relative;z-index:1}a{color:var(--text-accent);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--text-primary)}.site-header{position:sticky;top:0;z-index:100;background:#080c14d9;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border-subtle);height:72px;display:flex;align-items:center}.header-inner{display:flex;align-items:center;justify-content:space-between;width:100%}.brand-logo{display:flex;align-items:center;gap:var(--space-3);text-decoration:none}.brand-logo img{height:38px;width:auto;display:block}.nav-menu{display:flex;align-items:center;gap:var(--space-8);list-style:none}.nav-link{color:var(--text-secondary);font-size:.92rem;font-weight:500;transition:all var(--transition-fast);padding:var(--space-1) 0;position:relative}.nav-link:hover,.nav-link.active{color:var(--text-primary)}.nav-link.active:after{content:"";position:absolute;bottom:-4px;left:0;right:0;height:2px;background:var(--accent-hover);border-radius:var(--radius-full)}.header-actions{display:flex;align-items:center;gap:var(--space-4)}.search-trigger{display:flex;align-items:center;gap:var(--space-3);background:var(--bg-surface);border:1px solid var(--border-subtle);padding:8px 14px;border-radius:var(--radius-full);color:var(--text-muted);font-size:.85rem;font-family:var(--font-sans);cursor:pointer;transition:all var(--transition-fast)}.search-trigger:hover{border-color:var(--border-highlight);color:var(--text-secondary);background:var(--bg-surface-raised)}.search-kbd{background:var(--bg-surface-overlay);border:1px solid var(--border-subtle);border-radius:var(--radius-xs);padding:2px 6px;font-size:.72rem;font-family:var(--font-mono);color:var(--text-secondary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:10px 20px;font-size:.9rem;font-weight:600;font-family:var(--font-sans);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-smooth);border:none;text-decoration:none}.btn-primary{background:var(--accent-primary);color:#fff;box-shadow:0 4px 14px #2563eb66}.btn-primary:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px);box-shadow:0 6px 20px #3b82f699}.btn-secondary{background:var(--bg-surface-raised);color:var(--text-primary);border:1px solid var(--border-subtle)}.btn-secondary:hover{background:var(--bg-surface-overlay);border-color:var(--border-highlight);color:var(--text-primary);transform:translateY(-2px)}.btn-sm{padding:6px 14px;font-size:.82rem}.btn-lg{padding:14px 28px;font-size:1rem}.mobile-toggle{display:none;background:transparent;border:none;color:var(--text-primary);font-size:1.5rem;cursor:pointer;padding:var(--space-2)}.mobile-drawer{position:fixed;top:72px;left:0;right:0;bottom:0;background:#080c14f5;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);z-index:99;padding:var(--space-6);display:flex;flex-direction:column;gap:var(--space-6);transform:translateY(-100%);opacity:0;pointer-events:none;transition:all var(--transition-smooth)}.mobile-drawer.open{transform:translateY(0);opacity:1;pointer-events:auto}.mobile-nav-links{list-style:none;display:flex;flex-direction:column;gap:var(--space-4)}.mobile-nav-link{font-size:1.25rem;font-weight:600;color:var(--text-secondary);display:block;padding:var(--space-2) 0;border-bottom:1px solid var(--border-subtle)}.mobile-nav-link:hover,.mobile-nav-link.active{color:var(--text-accent)}.hero{padding:var(--space-20) 0 var(--space-16) 0;text-align:center}.hero-badge{display:inline-flex;align-items:center;gap:var(--space-2);background:#2563eb1f;border:1px solid rgba(59,130,246,.3);padding:6px 14px;border-radius:var(--radius-full);font-size:.82rem;font-family:var(--font-mono);color:var(--accent-cyan);margin-bottom:var(--space-6)}.hero-title{font-size:3.2rem;font-weight:800;line-height:1.15;letter-spacing:-.03em;margin-bottom:var(--space-6);color:var(--text-primary)}.hero-title .gradient-text{background:linear-gradient(135deg,#38bdf8,#60a5fa 55%,#818cf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;display:inline-block;text-shadow:0 0 40px rgba(56,189,248,.15)}.hero-lead{font-size:1.18rem;color:#cbd5e1;max-width:740px;margin:0 auto var(--space-8) auto;line-height:1.65}.hero-ctas{display:flex;align-items:center;justify-content:center;gap:var(--space-4);margin-bottom:var(--space-8)}.tech-tags{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:var(--space-2)}.tech-tag{font-family:var(--font-mono);font-size:.78rem;color:#94a3b8;background:#131b2eb3;border:1px solid rgba(255,255,255,.12);padding:4px 10px;border-radius:var(--radius-sm);cursor:pointer;-webkit-user-select:none;user-select:none;transition:all var(--transition-fast)}.tech-tag:hover{color:#38bdf8;border-color:#38bdf880;background:#06b6d41f;transform:translateY(-1px)}.section{padding:var(--space-16) 0}.section-header{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:var(--space-10);border-bottom:1px solid var(--border-subtle);padding-bottom:var(--space-4)}.section-title{font-size:1.85rem;font-weight:700;letter-spacing:-.02em;color:var(--text-primary);display:flex;align-items:center;gap:var(--space-3)}.section-subtitle{color:var(--text-secondary);font-size:.95rem;margin-top:var(--space-1)}.section-link{font-size:.9rem;font-weight:600;color:var(--text-accent);display:flex;align-items:center;gap:4px}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-6)}.course-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:var(--space-6);display:flex;flex-direction:column;justify-content:space-between;transition:all var(--transition-smooth);position:relative;overflow:hidden}.course-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-primary),var(--accent-cyan));opacity:0;transition:opacity var(--transition-fast)}.course-card:hover{transform:translateY(-4px);border-color:var(--border-highlight);box-shadow:var(--shadow-card-hover)}.course-card:hover:before{opacity:1}.course-num{font-family:var(--font-mono);font-size:.75rem;font-weight:600;color:var(--accent-cyan);background:var(--bg-surface-raised);border:1px solid rgba(6,182,212,.3);padding:3px 8px;border-radius:var(--radius-sm);display:inline-block;margin-bottom:var(--space-3)}.course-title{font-size:1.25rem;font-weight:700;line-height:1.35;color:var(--text-primary);margin-bottom:var(--space-3)}.course-desc{font-size:.9rem;color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-6)}.course-topics{list-style:none;display:flex;flex-direction:column;gap:var(--space-2);margin-bottom:var(--space-6);font-size:.85rem;color:var(--text-muted)}.course-topic-item{display:flex;align-items:center;gap:var(--space-2)}.course-topic-item:before{content:"✓";color:var(--accent-cyan);font-weight:700}.course-footer{padding-top:var(--space-4);border-top:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);flex-wrap:wrap}.class-grid-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-8);max-width:1040px;margin:0 auto}.class-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;transition:all var(--transition-smooth);position:relative}.class-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-primary),var(--accent-cyan));opacity:0;transition:opacity var(--transition-fast);z-index:2}.class-card:hover{transform:translateY(-4px);border-color:var(--border-highlight);box-shadow:var(--shadow-card-hover)}.class-card:hover:before{opacity:1}.class-card-cover{width:100%;aspect-ratio:1460 / 752;position:relative;background:var(--bg-surface-raised);border-bottom:1px solid var(--border-subtle);overflow:hidden}.class-card-cover img{width:100%;height:100%;object-fit:cover;display:block;transition:transform var(--transition-smooth)}.class-card:hover .class-card-cover img{transform:scale(1.03)}.class-card-body{padding:28px;display:flex;flex-direction:column;justify-content:space-between;flex:1}@media(max-width:900px){.class-grid-cards{grid-template-columns:1fr;gap:var(--space-6)}}.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-6)}.article-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;transition:all var(--transition-smooth);text-decoration:none;color:inherit;position:relative}.article-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-primary),var(--accent-cyan));opacity:0;transition:opacity var(--transition-fast);z-index:2}.article-card:hover{transform:translateY(-4px);border-color:var(--border-highlight);box-shadow:var(--shadow-card-hover)}.article-card:hover:before{opacity:1}.article-card-cover{width:100%;aspect-ratio:16 / 9;position:relative;background:var(--bg-surface-raised);border-bottom:1px solid var(--border-subtle);overflow:hidden}.article-card-cover img{width:100%;height:100%;object-fit:cover;display:block;transition:transform var(--transition-smooth)}.article-card:hover .article-card-cover img{transform:scale(1.03)}.article-card-body{padding:var(--space-6);display:flex;flex-direction:column;justify-content:space-between;flex:1}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-3)}.pill-badge{font-family:var(--font-mono);font-size:.75rem;font-weight:500;padding:3px 8px;border-radius:var(--radius-full);background:#2563eb26;color:var(--text-accent);border:1px solid rgba(37,99,235,.3)}.pill-badge.cyan{background:var(--accent-cyan-glow);color:var(--accent-cyan);border-color:#06b6d44d}.card-date{font-size:.8rem;color:var(--text-muted)}.card-title{font-size:1.18rem;font-weight:700;line-height:1.4;color:var(--text-primary);margin-bottom:var(--space-2);transition:color var(--transition-fast)}.article-card:hover .card-title{color:var(--text-accent)}.card-summary{font-size:.9rem;color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-6)}.card-tags{display:flex;flex-wrap:wrap;gap:var(--space-2);padding-top:var(--space-4);border-top:1px solid var(--border-subtle)}.card-tag{font-size:.75rem;font-family:var(--font-mono);color:var(--text-muted);background:var(--bg-surface-raised);padding:2px 8px;border-radius:var(--radius-xs);border:1px solid var(--border-subtle);cursor:pointer;-webkit-user-select:none;user-select:none;transition:all var(--transition-fast)}.card-tag:hover{color:var(--accent-cyan);border-color:#06b6d466;background:#06b6d414}.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-6)}.video-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;transition:all var(--transition-smooth);position:relative;box-shadow:var(--shadow-card)}.video-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-primary),var(--accent-cyan));opacity:0;transition:opacity var(--transition-fast);z-index:3}.video-card:hover{transform:translateY(-4px);border-color:var(--border-highlight);box-shadow:var(--shadow-card-hover)}.video-card:hover:before{opacity:1}.video-thumb-container{width:100%;aspect-ratio:16 / 9;background:var(--bg-surface-raised);position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;border-bottom:1px solid var(--border-subtle)}.video-thumb-bg{width:100%;height:100%;object-fit:cover;opacity:.92;display:block;transition:transform var(--transition-smooth)}.video-card:hover .video-thumb-bg{transform:scale(1.03)}.play-button-overlay{position:absolute;width:58px;height:58px;background:#2563ebeb;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;color:#fff;border:none;cursor:pointer;box-shadow:0 0 26px #2563eb99;transition:all var(--transition-smooth);z-index:2}.play-button-overlay svg{margin-left:3px}.video-card:hover .play-button-overlay,.play-button-overlay:hover{transform:scale(1.1);background:var(--accent-hover);box-shadow:0 0 34px #38bdf8cc}.video-duration{position:absolute;bottom:10px;right:10px;background:#000000d9;font-family:var(--font-mono);font-size:.75rem;font-weight:600;color:#fff;padding:3px 8px;border-radius:var(--radius-xs);border:1px solid rgba(255,255,255,.15);pointer-events:none;z-index:2}.video-card-body{padding:var(--space-6);display:flex;flex-direction:column;justify-content:space-between;flex:1}.video-card-footer{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-top:var(--space-4);margin-top:var(--space-4);border-top:1px solid var(--border-subtle)}.video-info{padding:var(--space-4);display:flex;flex-direction:column;justify-content:space-between;flex:1}.conversion-banner{background:linear-gradient(135deg,var(--bg-surface-raised) 0%,rgba(37,99,235,.14) 100%);border:1px solid rgba(59,130,246,.35);border-radius:var(--radius-xl);padding:var(--space-10);display:flex;align-items:center;justify-content:space-between;gap:var(--space-8);box-shadow:var(--shadow-card-hover);margin:var(--space-12) 0;position:relative;overflow:hidden}.conversion-banner:before{content:"";position:absolute;top:-50%;right:-20%;width:400px;height:400px;background:radial-gradient(circle,var(--accent-glow) 0%,transparent 70%);pointer-events:none}.cta-content h3{font-size:1.6rem;font-weight:800;letter-spacing:-.02em;color:#fff;margin-bottom:var(--space-2)}.cta-content p{color:var(--text-secondary);font-size:1rem;max-width:620px}.reader-header{padding:var(--space-12) 0 var(--space-8) 0;border-bottom:1px solid var(--border-subtle);margin-bottom:var(--space-8)}.reader-meta{display:flex;align-items:center;gap:var(--space-4);font-size:.85rem;color:var(--text-muted);margin-bottom:var(--space-4)}.reader-title{font-size:2.5rem;font-weight:800;line-height:1.2;letter-spacing:-.03em;margin-bottom:var(--space-4)}.prose{font-size:1.05rem;line-height:1.8;color:#cbd5e1}.prose p{margin-bottom:var(--space-6)}.prose h2{font-size:1.7rem;font-weight:700;color:var(--text-primary);margin:var(--space-10) 0 var(--space-4) 0;letter-spacing:-.02em}.prose h2[id]{scroll-margin-top:96px}.prose h3{font-size:1.3rem;font-weight:600;color:var(--text-primary);margin:var(--space-8) 0 var(--space-3) 0}.prose ul,.prose ol{margin-bottom:var(--space-6);padding-left:var(--space-6)}.prose li{margin-bottom:var(--space-2)}.prose blockquote{border-left:3px solid var(--accent-primary);padding-left:var(--space-4);margin:var(--space-6) 0;color:var(--text-secondary);font-style:italic;background:var(--bg-surface);padding:var(--space-4);border-radius:0 var(--radius-md) var(--radius-md) 0}.article-figure{max-width:640px;margin:var(--space-8) auto}.article-figure img{display:block;width:100%;height:auto;border:1px solid var(--border-subtle);border-radius:8px}.article-figure figcaption{margin-top:var(--space-3);color:var(--text-muted);font-size:.85rem;line-height:1.55}.article-toc{border-top:1px solid var(--border-subtle);border-bottom:1px solid var(--border-subtle);padding:var(--space-6) 0;margin:var(--space-8) 0}.article-toc strong{display:block;color:var(--text-primary);margin-bottom:var(--space-3)}.article-toc ol{columns:2;column-gap:var(--space-8);margin-bottom:0}.article-toc li{break-inside:avoid}.article-table-wrap{overflow-x:auto;max-width:100%;margin:var(--space-6) 0}.article-table{width:100%;min-width:620px;border-collapse:collapse;font-size:.92rem;line-height:1.55}.article-table th,.article-table td{padding:12px 14px;border-bottom:1px solid var(--border-subtle);text-align:left;vertical-align:top}.article-table thead th{color:var(--text-primary);font-weight:700;border-top:1px solid var(--border-subtle)}.article-table tbody th{color:var(--text-primary);font-weight:600}.code-container{background:#05080e;border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden;margin:var(--space-6) 0}.code-header{background:#090e18;border-bottom:1px solid var(--border-subtle);padding:8px 16px;display:flex;align-items:center;justify-content:space-between}.code-filename{font-family:var(--font-mono);font-size:.8rem;color:var(--text-secondary)}.copy-btn{background:transparent;border:1px solid var(--border-subtle);color:var(--text-muted);font-size:.75rem;font-family:var(--font-mono);padding:3px 8px;border-radius:var(--radius-xs);cursor:pointer;transition:all var(--transition-fast)}.copy-btn:hover{color:var(--text-primary);border-color:var(--border-highlight)}pre code{display:block;padding:18px 20px;font-family:var(--font-mono);font-size:.88rem;line-height:1.65;color:#e2e8f0;overflow-x:auto}.search-modal-backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background:#04070ccc;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:1000;display:flex;align-items:flex-start;justify-content:center;padding-top:100px;opacity:0;pointer-events:none;transition:opacity var(--transition-fast)}.search-modal-backdrop.open{opacity:1;pointer-events:auto}.search-modal{background:var(--bg-surface-overlay);border:1px solid var(--border-highlight);border-radius:var(--radius-lg);width:100%;max-width:640px;box-shadow:var(--shadow-modal);overflow:hidden;transform:translateY(-10px) scale(.98);transition:transform var(--transition-smooth)}.search-modal-backdrop.open .search-modal{transform:translateY(0) scale(1)}.search-input-wrapper{display:flex;align-items:center;padding:16px 20px;border-bottom:1px solid var(--border-subtle);gap:12px}.search-input{background:transparent;border:none;outline:none;font-size:1.05rem;font-family:var(--font-sans);color:var(--text-primary);width:100%}.search-input::placeholder{color:var(--text-muted)}.search-results{max-height:400px;overflow-y:auto;padding:8px}.search-item{display:block;padding:12px 16px;border-radius:var(--radius-md);text-decoration:none;color:inherit;transition:background var(--transition-fast);cursor:pointer}.search-item:hover,.search-item.selected{background:var(--bg-surface-raised)}.search-item-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:4px}.search-item-title{font-size:.95rem;font-weight:600;color:var(--text-primary)}.search-item-desc{font-size:.82rem;color:var(--text-secondary)}.search-modal-footer{padding:10px 20px;background:var(--bg-surface);border-top:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between;font-size:.75rem;font-family:var(--font-mono);color:var(--text-muted)}.site-footer{background:#060910;border-top:1px solid var(--border-subtle);padding:var(--space-16) 0 var(--space-8) 0;margin-top:auto}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:var(--space-8);margin-bottom:var(--space-12)}.footer-brand p{color:var(--text-secondary);font-size:.9rem;margin-top:var(--space-3);max-width:320px}.footer-col h4{font-size:.88rem;font-weight:700;color:var(--text-primary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--space-4)}.footer-links{list-style:none;display:flex;flex-direction:column;gap:var(--space-2)}.footer-link{color:var(--text-secondary);font-size:.88rem;transition:color var(--transition-fast)}.footer-link:hover{color:var(--text-primary)}.footer-bottom{padding-top:var(--space-6);border-top:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between;font-size:.82rem;color:var(--text-muted)}.featured-video-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden;display:grid;grid-template-columns:minmax(0,480px) 1fr;gap:0;box-shadow:var(--shadow-card);transition:all var(--transition-smooth);position:relative}.featured-video-card:hover{border-color:var(--border-highlight);box-shadow:var(--shadow-card-hover)}.featured-video-media{position:relative;background:var(--bg-surface-raised);border-right:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:center;overflow:hidden;aspect-ratio:16 / 9;min-height:270px}.featured-video-media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform var(--transition-smooth)}.featured-video-media:hover img{transform:scale(1.02)}.featured-video-play-btn{position:absolute;width:64px;height:64px;border-radius:50%;background:#2563ebeb;box-shadow:0 0 28px #2563eb99;display:flex;align-items:center;justify-content:center;border:none;cursor:pointer;transition:all var(--transition-smooth);color:#fff;z-index:2}.featured-video-play-btn:hover{background:var(--accent-hover);transform:scale(1.1);box-shadow:0 0 36px #38bdf8cc}.featured-video-duration{position:absolute;bottom:12px;right:12px;background:#000000d9;color:#fff;font-family:var(--font-mono);font-size:.75rem;font-weight:600;padding:3px 8px;border-radius:var(--radius-xs);pointer-events:none;z-index:2}.featured-video-content{padding:32px;display:flex;flex-direction:column;justify-content:space-between}@media(max-width:900px){.featured-video-card{grid-template-columns:1fr}.featured-video-media{border-right:none;border-bottom:1px solid var(--border-subtle)}.featured-video-content{padding:var(--space-6)}}@media(max-width:1023px){.course-grid,.article-grid,.video-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(3,1fr)}.footer-brand{grid-column:span 3;margin-bottom:var(--space-2)}.hero-title{font-size:2.6rem}}@media(max-width:767px){.reader-meta{flex-wrap:wrap}.reader-title{font-size:2rem}.article-toc ol{columns:1}.article-table{min-width:0}.article-table thead{display:none}.article-table,.article-table tbody,.article-table tr,.article-table th,.article-table td{display:block;width:100%}.article-table tr{border-top:1px solid var(--border-subtle);padding:var(--space-3) 0}.article-table th,.article-table td{border:0;padding:4px 0}.article-table td:before{content:attr(data-label);display:block;color:var(--text-muted);font-size:.78rem;font-weight:600;margin-bottom:2px}.nav-menu,.search-trigger{display:none}.mobile-toggle{display:block}.course-grid,.article-grid,.video-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr;gap:var(--space-6)}.footer-brand{grid-column:auto}.hero{padding:var(--space-12) 0}.hero-title{font-size:2.1rem}.hero-ctas{flex-direction:column}.conversion-banner{flex-direction:column;align-items:flex-start;padding:var(--space-6)}.footer-bottom{flex-direction:column;gap:var(--space-3);text-align:center}.search-modal{margin:0 16px}}