:root{--q-void: #030108;--q-deep: #0a0618;--q-surface: #110d24;--q-surface-alt: #0d0a1f;--q-border: rgba(100, 180, 255, .12);--q-border-warm: rgba(255, 100, 0, .2);--q-cyan: #00e5ff;--q-cyan-dim: rgba(0, 229, 255, .4);--q-cyan-glow: rgba(0, 229, 255, .15);--q-violet: #b44dff;--q-violet-dim: rgba(180, 77, 255, .4);--q-gold: #ffc846;--q-gold-dim: rgba(255, 200, 70, .3);--q-danger: #ff4500;--q-danger-dim: rgba(255, 69, 0, .25);--q-text: #e0e6f0;--q-text-dim: rgba(224, 230, 240, .5);--q-text-muted: rgba(224, 230, 240, .3);--font-display: "Orbitron", sans-serif;--font-mono: "Share Tech Mono", monospace;--font-body: "DM Sans", sans-serif;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 32px;--space-xl: 64px;--space-2xl: 96px;--ease-out-expo: cubic-bezier(.16, 1, .3, 1);--duration-fast: .2s;--duration-normal: .4s;--duration-slow: .8s}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-body);background:var(--q-void);color:var(--q-text);line-height:1.7;overflow-x:hidden;min-height:100vh}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--q-void)}::-webkit-scrollbar-thumb{background:var(--q-cyan-dim);border-radius:3px}::selection{background:var(--q-cyan-dim);color:#fff}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}#app{position:relative}.section-lesson{min-height:100vh;padding:var(--space-2xl) var(--space-lg);position:relative;display:flex;align-items:center;justify-content:center}.section-lesson:nth-child(2n){background:var(--q-surface-alt)}.lesson-inner{max-width:1100px;width:100%;padding:0 var(--space-md)}.lesson-number{font-family:var(--font-display);font-size:.7rem;letter-spacing:6px;color:var(--q-cyan);text-transform:uppercase;margin-bottom:var(--space-sm);opacity:.7}.lesson-title{font-family:var(--font-display);font-size:clamp(1.8rem,5vw,3.2rem);font-weight:900;color:#fff;margin-bottom:var(--space-lg);line-height:1.2;text-shadow:0 0 40px var(--q-cyan-glow)}.lesson-text{font-size:1.15rem;color:var(--q-text);max-width:780px;margin-bottom:var(--space-lg);line-height:1.8}.lesson-text strong{color:var(--q-cyan);font-weight:600}.lesson-text em{color:var(--q-gold);font-style:normal}.demo-container{background:var(--q-deep);border:1px solid var(--q-border);border-radius:12px;padding:var(--space-xl) var(--space-lg);position:relative;overflow:hidden}.demo-container:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse at 30% 20%,var(--q-cyan-glow) 0%,transparent 60%);pointer-events:none}.demo-label{font-family:var(--font-mono);font-size:.7rem;color:var(--q-text-muted);letter-spacing:3px;text-transform:uppercase;margin-bottom:var(--space-md);position:relative;z-index:1}.q-btn{font-family:var(--font-mono);font-size:.85rem;letter-spacing:1px;padding:10px 24px;border:1px solid var(--q-cyan-dim);background:transparent;color:var(--q-cyan);cursor:pointer;transition:all var(--duration-fast) var(--ease-out-expo);position:relative;z-index:1}.q-btn:hover{background:var(--q-cyan-glow);border-color:var(--q-cyan);box-shadow:0 0 20px var(--q-cyan-glow)}.q-btn:active{transform:scale(.97)}.q-btn--gold{border-color:var(--q-gold-dim);color:var(--q-gold)}.q-btn--gold:hover{background:var(--q-gold-dim);border-color:var(--q-gold);box-shadow:0 0 20px var(--q-gold-dim)}.q-btn--danger{border-color:var(--q-danger-dim);color:var(--q-danger)}.q-btn--danger:hover{background:var(--q-danger-dim);border-color:var(--q-danger)}.q-nav{position:fixed;top:0;left:0;right:0;z-index:1000;padding:var(--space-md) var(--space-lg);display:flex;align-items:center;justify-content:space-between;background:#030108d9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--q-border);transition:transform var(--duration-normal) var(--ease-out-expo)}.q-nav__logo{font-family:var(--font-display);font-size:.85rem;font-weight:900;letter-spacing:3px;color:#fff;text-decoration:none;display:flex;align-items:center;gap:var(--space-sm)}.q-nav__logo-icon{width:24px;height:24px;border:2px solid var(--q-cyan);border-radius:50%;position:relative;animation:logo-pulse 3s ease-in-out infinite}.q-nav__logo-icon:after{content:"";position:absolute;width:8px;height:8px;background:var(--q-cyan);border-radius:50%;top:50%;left:50%;transform:translate(-50%,-50%)}@keyframes logo-pulse{0%,to{box-shadow:0 0 4px var(--q-cyan-dim)}50%{box-shadow:0 0 16px var(--q-cyan-dim)}}.q-nav__links{display:flex;gap:var(--space-lg);list-style:none}.q-nav__link{font-family:var(--font-mono);font-size:.75rem;letter-spacing:2px;color:var(--q-text-dim);text-decoration:none;text-transform:uppercase;transition:color var(--duration-fast);position:relative}.q-nav__link:hover,.q-nav__link--active{color:var(--q-cyan)}.q-nav__link:after{content:"";position:absolute;bottom:-4px;left:0;width:0;height:1px;background:var(--q-cyan);transition:width var(--duration-normal) var(--ease-out-expo)}.q-nav__link:hover:after,.q-nav__link--active:after{width:100%}.hero-section{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;overflow:hidden}.hero-section .video-bg{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;object-fit:cover;z-index:0;opacity:.6}.hero-section .video-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(to bottom,rgba(3,1,8,.4) 0%,var(--q-void) 95%);z-index:1}.hero-content{position:relative;z-index:10;text-align:center;padding:var(--space-lg)}.hero-subtitle{font-family:var(--font-mono);font-size:.8rem;letter-spacing:6px;color:var(--q-cyan);text-transform:uppercase;margin-bottom:var(--space-md)}.hero-title{font-family:var(--font-display);font-size:clamp(2.2rem,6vw,4.5rem);font-weight:900;color:#fff;line-height:1.1;margin-bottom:var(--space-md);text-shadow:0 0 60px var(--q-cyan-glow)}.hero-description{font-size:1.1rem;color:var(--q-text-dim);max-width:500px;margin:0 auto var(--space-lg)}.hero-qday{max-width:420px;margin:0 auto var(--space-xl)}.hero-cta{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap}.video-speed-control{position:absolute;bottom:40px;right:30px;z-index:20;display:flex;align-items:center;gap:10px;background:#030108b3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--q-border);border-radius:6px;padding:6px 14px}.speed-label{font-family:var(--font-mono);font-size:.6rem;letter-spacing:2px;color:var(--q-text-muted);text-transform:uppercase}.speed-slider{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:80px;height:3px;background:#ffffff1a;border-radius:2px;outline:none;cursor:pointer}.speed-slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;background:var(--q-cyan);cursor:pointer;box-shadow:0 0 8px var(--q-cyan-dim)}.speed-slider::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--q-cyan);cursor:pointer;border:none;box-shadow:0 0 8px var(--q-cyan-dim)}.speed-value{font-family:var(--font-mono);font-size:.75rem;color:var(--q-cyan);min-width:30px}.scroll-indicator{position:absolute;bottom:40px;left:50%;transform:translate(-50%);z-index:10;display:flex;flex-direction:column;align-items:center;gap:var(--space-sm);animation:scroll-bounce 2s ease-in-out infinite}.scroll-indicator__text{font-family:var(--font-mono);font-size:.6rem;letter-spacing:4px;color:var(--q-text-muted);text-transform:uppercase}.scroll-indicator__arrow{width:16px;height:16px;border-right:1px solid var(--q-text-muted);border-bottom:1px solid var(--q-text-muted);transform:rotate(45deg)}@keyframes scroll-bounce{0%,to{transform:translate(-50%) translateY(0)}50%{transform:translate(-50%) translateY(10px)}}@media (max-width: 768px){.section-lesson{padding:var(--space-xl) var(--space-md)}.q-nav__links{gap:var(--space-md)}.q-nav__link{font-size:.65rem}.demo-container{padding:var(--space-lg) var(--space-md)}.video-speed-control{bottom:auto;top:70px;right:10px;padding:4px 10px}.speed-label{display:none}.speed-slider{width:60px}.hero-qday{max-width:100%}}@media (max-width: 480px){.q-nav{padding:var(--space-sm) var(--space-md)}.q-nav__links{display:none}}