:root { --bg:#f8f9fa; --card:#fff; --fg:#2c3e50; --muted:#6b7a86; --blue:#2b99d6; --orange:#ff6b35; --line:#e3e8ec; }
@media (prefers-color-scheme: dark) { :root { --bg:#141c24; --card:#1d2833; --fg:#e8eef3; --muted:#9db0bf; --line:#2c3a47; } }
* { box-sizing: border-box; }
body { margin:0; font-family: Ubuntu, system-ui, sans-serif; background:var(--bg); color:var(--fg); line-height:1.65; }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; }
.brand { font-weight:800; font-size:1.15rem; color:var(--fg); text-decoration:none; }
.brand span { font-weight:400; color:var(--muted); }
nav a { color:var(--muted); text-decoration:none; margin-left:16px; font-size:.95rem; }
nav a:hover { color:var(--blue); }
main { padding-top: 28px; padding-bottom: 40px; }
.card { background:var(--card); border:1px solid var(--line); border-bottom:3px solid var(--blue); border-radius:20px; padding:28px; margin-bottom:20px; }
h1 { margin:0 0 8px; font-size:1.8rem; } h2 { margin-top:28px; font-size:1.15rem; color:var(--blue); }
p, li { color: var(--fg); } .muted { color:var(--muted); font-size:.9rem; }
a { color: var(--blue); } ul { padding-left: 20px; }
.btn { display:inline-block; background:linear-gradient(135deg,var(--blue),#1c7fb8); color:#fff; text-decoration:none; padding:10px 20px; border-radius:14px; font-weight:700; }
footer { padding-bottom: 40px; color:var(--muted); font-size:.85rem; }