:root{--bg:#0f1115;--panel:#161a22;--line:#2b3140;--text:#e9ecf1;--muted:#a8b0c0;--accent:#ff3b30;--ok:#16c47f}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;background:radial-gradient(circle at 30% -20%,#1a2030 0,var(--bg) 55%);color:var(--text)}.container{max-width:1100px;margin:0 auto;padding:28px 16px 50px}.card{border:1px solid var(--line);border-radius:12px;background:var(--panel)}.btn{border:1px solid var(--line);background:#1d2432;color:var(--text);padding:9px 14px;border-radius:8px;cursor:pointer;font-weight:600}.btn:hover{opacity:.92}