:root{--bg-color:#050510;--card-bg:rgba(20, 20, 35, 0.6);--primary-color:#00f2fe;--secondary-color:#4facfe;--accent-color:#ff0055;--text-main:#ffffff;--text-muted:#a0a0b0;--border-color:rgba(255, 255, 255, 0.1);--glow:0 0 20px rgba(0, 242, 254, 0.5)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,'PingFang SC','Microsoft YaHei',sans-serif;background-color:var(--bg-color);color:var(--text-main);line-height:1.6;overflow-x:hidden}.navbar{position:fixed;top:0;width:100%;padding:1.5rem 5%;display:flex;justify-content:space-between;align-items:center;background:rgba(5,5,16,.8);backdrop-filter:blur(10px);z-index:1000;border-bottom:1px solid var(--border-color)}.logo{font-size:1.8rem;font-weight:800;background:linear-gradient(to right,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;color:transparent;letter-spacing:1px;display:flex;align-items:center;gap:10px}.logo i{color:var(--primary-color)}.nav-links{display:flex;gap:2rem;align-items:center}.nav-links a{color:var(--text-muted);text-decoration:none;font-size:.95rem;transition:color .3s;font-weight:500}.nav-links a:hover{color:var(--primary-color)}.btn-login{border:1px solid var(--primary-color);padding:.5rem 1.5rem;border-radius:50px;color:var(--primary-color)!important;transition:.3s}.btn-login:hover{background:rgba(0,242,254,.1);box-shadow:0 0 15px rgba(0,242,254,.3)}.hero-section{height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;position:relative;padding:0 20px}#circuit-canvas{position:absolute;top:0;left:0;width:100%;height:100%;z-index:-1;opacity:.6}.hero-content{z-index:1;max-width:800px;animation:1s ease-out fadeInUp}.hero-tag{display:inline-block;padding:.5rem 1rem;background:rgba(0,242,254,.1);border:1px solid rgba(0,242,254,.3);border-radius:50px;color:var(--primary-color);font-size:.9rem;margin-bottom:1.5rem;letter-spacing:2px}.hero-title{font-size:4rem;font-weight:900;margin-bottom:1.5rem;line-height:1.1}.hero-title span{background:linear-gradient(135deg,#fff 0,var(--secondary-color) 100%);-webkit-background-clip:text;color:transparent}.hero-subtitle{font-size:1.2rem;color:var(--text-muted);margin-bottom:3rem;max-width:600px;margin-left:auto;margin-right:auto}.cta-group{display:flex;gap:20px;justify-content:center}.btn-primary{padding:1rem 3rem;font-size:1.2rem;font-weight:600;color:#000;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));border:none;border-radius:50px;cursor:pointer;text-decoration:none;transition:transform .3s,box-shadow .3s;display:flex;align-items:center;gap:10px}.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 30px rgba(0,242,254,.6)}.btn-outline{padding:1rem 3rem;font-size:1.2rem;font-weight:600;color:#fff;background:0 0;border:2px solid rgba(255,255,255,.2);border-radius:50px;cursor:pointer;text-decoration:none;transition:.3s}.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.05)}.section{padding:8rem 5%}.section-header{text-align:center;margin-bottom:4rem}.section-title{font-size:2.5rem;margin-bottom:1rem}.section-desc{color:var(--text-muted)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem;max-width:1200px;margin:0 auto}.feature-card{background:var(--card-bg);border:1px solid var(--border-color);padding:2.5rem;border-radius:20px;transition:transform .3s,border-color .3s;position:relative;overflow:hidden}.feature-card:hover{transform:translateY(-10px);border-color:var(--secondary-color);box-shadow:0 10px 30px rgba(0,0,0,.3)}.feature-icon{font-size:2.5rem;color:var(--primary-color);margin-bottom:1.5rem;background:rgba(0,242,254,.1);width:80px;height:80px;border-radius:50%;display:flex;align-items:center;justify-content:center}.feature-card h3{font-size:1.5rem;margin-bottom:1rem}.feature-card p{color:var(--text-muted)}.showcase-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:2rem;max-width:1200px;margin:0 auto}.showcase-card{border-radius:15px;overflow:hidden;position:relative;aspect-ratio:16/9;background:#1a1a2e;border:1px solid var(--border-color);cursor:pointer}.showcase-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}.showcase-card:hover img{transform:scale(1.1)}.showcase-overlay{position:absolute;bottom:0;left:0;width:100%;padding:20px;background:linear-gradient(to top,rgba(0,0,0,.9),transparent);transform:translateY(100%);transition:transform .3s}.showcase-card:hover .showcase-overlay{transform:translateY(0)}.tutorial-section{background:linear-gradient(180deg,var(--bg-color),#0a0a20)}.tutorial-list{display:flex;flex-wrap:wrap;justify-content:center;gap:1.5rem}.tutorial-pill{background:rgba(255,255,255,.05);padding:1rem 2rem;border-radius:50px;color:#fff;text-decoration:none;border:1px solid var(--border-color);display:flex;align-items:center;gap:10px;transition:.3s}.tutorial-pill:hover{background:var(--primary-color);color:#000;border-color:var(--primary-color)}footer{border-top:1px solid var(--border-color);padding:4rem 5%;text-align:center;color:var(--text-muted)}.footer-links{margin-bottom:2rem;display:flex;justify-content:center;gap:2rem}.footer-links a{color:var(--text-muted);text-decoration:none;transition:color .3s}.footer-links a:hover{color:#fff}@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@media (max-width:768px){.hero-title{font-size:2.5rem}.cta-group{flex-direction:column}.nav-links{display:none}.mobile-menu-btn{display:block;color:#fff;font-size:1.5rem;cursor:pointer}}