:root{--primary-color:#7d7d7d;--secondary-color:#bebebe;--background-color:#0f172a;--text-color:#f1f5f9;--border-color:hsla(0,0%,100%,.3);--card-bg:rgba(30,41,59,.8);--shadow:0 1px 3px 0 rgba(0,0,0,.3);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.3);--btn-background-color:hsla(0,0%,100%,.2);--current-bg:none;--toggle-bg-on:#e5e7eb;--toggle-bg-off:#414141;--toggle-border-on:#e5e7eb;--toggle-border-off:#414141}*{box-sizing:border-box;margin:0;padding:0}body{background-attachment:fixed;background-color:var(--background-color);background-image:var(--current-bg);background-position:50%;background-size:cover;color:var(--text-color);font-family:Arial,Helvetica,sans-serif;line-height:1.2;min-height:100vh}@media(max-width:768px){body{background-attachment:scroll}}.container{margin:0 auto;max-width:98%;padding:0 1rem}.card{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:var(--card-bg);border:1px solid hsla(0,0%,100%,.1);border-radius:8px;box-shadow:var(--shadow);padding:1.5rem;transition:box-shadow .3s ease}.card:hover{box-shadow:var(--shadow-lg)}.btn{border:none;border-radius:6px;cursor:pointer;display:inline-block;font-size:1rem;font-weight:500;padding:.75rem 1.5rem;text-align:center;text-decoration:none;transition:all .3s ease}.grid{display:grid;gap:2rem}.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.grid-3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}h1,h2,h3,h4{font-weight:600;margin-bottom:1rem}h1{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;font-size:2.5rem;-webkit-text-fill-color:transparent;background-clip:text}h2{font-size:2rem}h3{font-size:1.5rem}