*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Open Sans',sans-serif;background:var(--bg-body);color:var(--text-main);line-height:1.6;overflow-x:hidden;transition:background .3s ease,color .3s ease}h1,h2,h3{font-family:'Poppins',sans-serif;color:var(--primary-accent)}header{background:var(--bg-header);backdrop-filter:blur(12px);box-shadow:0 4px 20px rgba(0,0,0,.05);position:sticky;top:0;z-index:1000;padding:.8rem 0;border-bottom:1px solid var(--border-light);transition:background .3s ease}.header-content{max-width:var(--container-width);margin:0 auto;padding:0 1.5rem;display:flex;justify-content:space-between;align-items:center}.logo{font-family:'Poppins',sans-serif;font-weight:800;font-size:1.6rem;color:var(--primary-accent);text-decoration:none;display:flex;align-items:center;gap:4px;letter-spacing:-.5px}.logo-symbol{font-size:2rem;font-weight:400;line-height:1}.header-right{display:flex;align-items:center;gap:20px}nav ul{display:flex;gap:20px;list-style:none;margin:0;padding:0}nav a{color:var(--text-main);font-weight:600;font-size:.95rem;text-decoration:none;position:relative;transition:color .3s ease}nav a:hover,nav a.active{color:var(--primary-accent)}.nav-container{max-width:var(--container-width);margin:2rem auto;padding:0 1.5rem;display:flex;justify-content:space-between;align-items:center;gap:1rem}.nav-btn{padding:10px 18px;border-radius:10px;font-weight:600;text-decoration:none;transition:all .25s ease;background:var(--bg-card);color:var(--primary);border:1px solid var(--border-light)}.nav-btn:hover{background:var(--primary);color:#fff}.nav-btn.btn-prev{margin-right:auto}.nav-btn.btn-next{margin-left:auto}footer{background:var(--footer-bg);color:#b0b0b0;padding:4rem 0 2rem;margin-top:5rem;border-top:4px solid var(--primary)}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:3rem;max-width:var(--container-width);margin:0 auto;padding:0 1.5rem}.footer-col{display:flex;flex-direction:column;align-items:flex-start}.footer-brand .logo,.footer-brand .logo-symbol{font-size:1.6rem!important;color:#fff!important;margin-bottom:1rem}.footer-brand .logo-symbol{font-size:1.8rem!important}.footer-brand p{color:#888;font-size:.9rem;margin-top:.5rem;line-height:1.6;max-width:300px}.footer-col h3{color:#fff;margin-bottom:1.5rem;font-size:1.1rem;position:relative;display:inline-block}.footer-col h3::after{content:'';position:absolute;left:0;bottom:-8px;width:30px;height:3px;background:var(--primary);border-radius:2px}.footer-col ul{list-style:none;padding:0;margin:0}.footer-col li{margin-bottom:.8rem}.footer-col a{color:#b0b0b0;text-decoration:none;font-size:.95rem;transition:all .2s ease;display:inline-block}.footer-col a:hover{color:var(--primary);transform:translateX(5px)}.footer-bottom{margin-top:4rem;padding-top:2rem;border-top:1px solid rgba(255,255,255,.1);text-align:center;color:#666;font-size:.85rem}header{margin-bottom:0}main{padding-top:2rem}.option{display:flex;align-items:flex-start;gap:8px}.option span,.option mjx-container{display:inline}@media (max-width:768px){body{overflow-x:auto}.header-content{padding:0 1rem}}