:root{--bg:#0a0a0f;--fg:#f5f5f7;--muted:#8a8a99;--card:#14141c;--border:#2a2a38;--accent:#6366f1;--accent-hover:#4f46e5;--success:#10b981;--error:#ef4444}*{box-sizing:border-box;margin:0;padding:0}body,html{background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,system-ui,sans-serif;font-size:16px;line-height:1.6;min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}.topbar{justify-content:space-between;padding:1rem 2rem;border-bottom:1px solid var(--border);background:rgba(20,20,28,.8);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);position:-webkit-sticky;position:sticky;top:0;z-index:50}.brand,.topbar{display:flex;align-items:center}.brand{gap:.5rem;font-weight:700;color:var(--fg)}.logo{font-size:1.5rem}.badge,.logo{color:var(--accent)}.badge{background:rgba(99,102,241,.15);padding:.25rem .75rem;border-radius:999px;font-size:.75rem;font-weight:600;letter-spacing:.03em}.container{max-width:1100px;margin:0 auto;padding:2rem;min-height:calc(100vh - 140px)}.hero{text-align:center;padding:4rem 0 3rem}.hero h1{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;letter-spacing:-.02em;margin-bottom:1rem}.hero p{color:var(--muted);font-size:1.125rem;max-width:640px;margin:0 auto}.systems-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));grid-gap:1.5rem;gap:1.5rem;margin-top:2rem}.system-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:2rem;transition:all .2s;display:flex;flex-direction:column;text-decoration:none;color:var(--fg)}.system-card:hover{border-color:var(--accent);transform:translateY(-2px);color:var(--fg)}.system-card .icon{font-size:2.5rem;margin-bottom:1rem}.system-card h2{font-size:1.5rem;font-weight:700;margin-bottom:.5rem}.system-card p{color:var(--muted);flex:1 1}.system-card .cta{margin-top:1.5rem;color:var(--accent);font-weight:600}.section{padding:2rem 0}.section h1{font-size:2rem;font-weight:800;margin-bottom:.5rem}.section .lead{color:var(--muted);margin-bottom:2rem}.plan-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));grid-gap:1.5rem;gap:1.5rem;margin-bottom:2rem}.plan{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:2rem;position:relative;cursor:pointer;transition:all .2s}.plan.selected{border-color:var(--accent);box-shadow:0 0 0 2px rgba(99,102,241,.3)}.plan.popular:before{content:"MOST POPULAR";position:absolute;top:-10px;right:1rem;background:var(--accent);color:#fff;padding:.25rem .75rem;border-radius:999px;font-size:.7rem;font-weight:700}.plan h3{font-size:1.25rem;margin-bottom:.25rem}.plan .price{font-size:2rem;font-weight:800;margin:1rem 0}.plan .price small{font-size:.9rem;color:var(--muted);font-weight:400}.plan ul{list-style:none;margin-top:1rem}.plan li{padding:.4rem 0;color:var(--muted);font-size:.9rem}.plan li:before{content:"✓ ";color:var(--success);font-weight:700}.checkout-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:2rem;max-width:520px;margin:0 auto}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.4rem;color:var(--muted)}.form-group input{width:100%;padding:.75rem;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--fg);font-size:1rem}.form-group input:focus{outline:none;border-color:var(--accent)}#card-container{min-height:90px;margin:1rem 0;padding:.5rem;background:var(--bg);border:1px solid var(--border);border-radius:8px}.btn{display:inline-block;background:var(--accent);color:#fff;border:none;padding:.875rem 1.5rem;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s;width:100%}.btn:hover:not(:disabled){background:var(--accent-hover)}.btn:disabled{opacity:.5;cursor:not-allowed}.summary{background:rgba(99,102,241,.08);border:1px solid rgba(99,102,241,.3);border-radius:8px;padding:1rem;margin-bottom:1rem}.summary .total{display:flex;justify-content:space-between;font-weight:700;font-size:1.125rem;margin-top:.5rem;padding-top:.5rem;border-top:1px solid var(--border)}.alert{padding:.75rem 1rem;border-radius:8px;margin:1rem 0;font-size:.9rem}.alert.error{background:rgba(239,68,68,.1);border:1px solid var(--error);color:var(--error)}.alert.success{background:rgba(16,185,129,.1);border:1px solid var(--success);color:var(--success)}.footer{border-top:1px solid var(--border);padding:1.5rem 2rem;display:flex;justify-content:space-between;color:var(--muted);font-size:.85rem}