:root{--bg:#ffffff;--fg:#111111;--muted:#666;--border:#eaeaea;--accent:#000}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,'Helvetica Neue',Arial,sans-serif;color:var(--fg);background:var(--bg);}
.topbar{background:#fff;border-bottom:1px solid var(--border);}
.topbar .container{display:flex;align-items:center;justify-content:space-between;padding:.5rem 0;}
.topbar .brand{display:flex;align-items:center;gap:.5rem;font-weight:800}
.topbar .social a{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border:1px solid var(--border);border-radius:50%;margin-left:.4rem;color:var(--fg);text-decoration:none}
.topbar .social a:hover{background:#f5f5f5}
.navbar{border-bottom:1px solid var(--border);}
.navbar-brand{font-weight:800}
.hero{padding:96px 0 72px;background:#fff;border-bottom:1px solid var(--border);text-align:center}
.hero h1{font-size:2.5rem;margin-bottom:.5rem}
.hero .lead{color:var(--muted);font-size:1.15rem}
.section{padding:64px 0}
.card{border:1px solid var(--border); border-radius:12px}
.card:hover{box-shadow:0 14px 40px rgba(0,0,0,.06)}
.icon{width:28px;height:28px;vertical-align:middle}
.footer{border-top:1px solid var(--border);padding:28px 0;background:#fff}
.footer .muted{color:var(--muted)}
.btn-dark{background:#000;border-color:#000}
.btn-dark:hover{filter:brightness(0.9)}