:root{--bg-color:#f8fafc;--surface-color:#fff;--primary-color:#3b82f6;--accent-color:#6366f1;--text-primary:#0f172a;--text-secondary:#475569;--border-color:#cbd5e1;--font-main:"Inter",sans-serif;--max-width:1200px;--card-bg:#fff;--input-bg:#f1f5f9;--nav-bg:rgba(248,250,252,.8)}[data-theme=dark]{--bg-color:#0f172a;--surface-color:#1e293b;--primary-color:#60a5fa;--accent-color:#818cf8;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--border-color:#334155;--card-bg:#334155;--input-bg:#1e293b;--nav-bg:rgba(15,23,42,.85)}.btn,.card,.footer,.navbar,.stack-item,body{transition:background-color .3s ease,color .3s ease,border-color .3s ease}*{box-sizing:border-box;margin:0;padding:0}body{background-attachment:fixed;background-color:var(--bg-color);background-image:radial-gradient(at 0 0,rgba(59,130,246,.08) 0,transparent 50%),radial-gradient(at 100% 0,rgba(99,102,241,.08) 0,transparent 50%),radial-gradient(at 100% 100%,rgba(59,130,246,.05) 0,transparent 50%);color:var(--text-primary);font-family:var(--font-main);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none;transition:all .2s ease}a:hover{color:var(--primary-color)}.container{margin:0 auto;max-width:var(--max-width);padding:0 20px;width:90%}h1,h2,h3{color:var(--text-primary);font-weight:800;letter-spacing:-.03em;line-height:1.1}h1{background:none;font-size:4rem;margin-bottom:1.5rem;-webkit-text-fill-color:initial}h2{font-size:2.5rem;margin-bottom:2rem}.subtitle{color:var(--text-secondary);font-size:1.35rem;font-weight:400;line-height:1.5}.btn{align-items:center;background:var(--text-primary);border:1px solid var(--text-primary);border-radius:8px;color:var(--bg-color);display:inline-flex;font-weight:600;justify-content:center;padding:14px 28px;transition:all .2s ease}.btn:hover{box-shadow:0 4px 15px #0000000d;transform:translateY(-2px)}.btn-outline,.btn:hover{background:transparent;color:var(--text-primary)}.btn-outline{border:1px solid var(--border-color)}.btn-outline:hover{border-color:var(--text-primary)}.btn-sm{font-size:.9rem;padding:8px 16px}.flex-center{align-items:center;display:flex;justify-content:center}section{padding:80px 0}@media(max-width:768px){section{padding:60px 0}}.card{background:var(--surface-color);border:1px solid transparent;border-radius:12px;padding:2rem;transition:all .3s cubic-bezier(.25,.8,.25,1)}.card:hover{background:#fff;box-shadow:0 10px 30px #00000014;transform:translateY(-5px)}.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.grid-2,.grid-3{display:grid;gap:2rem}.grid-3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}@media(max-width:768px){h1{font-size:2.5rem}h2{font-size:1.75rem}}@media(max-width:480px){.container{padding:0 16px}h1{font-size:2rem}.btn{justify-content:center;width:100%}}