:root{--flag-green:#009739;--flag-red:#EF3340;--flag-black:#000;--flag-yellow:#FFD100;}
.bg-flag{background:linear-gradient(135deg,var(--flag-green) 50%,var(--flag-red) 50%);min-height:100vh;}
.text-flag{color:var(--flag-yellow);text-shadow:0 1px 0 #000;}
.btn-flag{background:linear-gradient(90deg,var(--flag-black),var(--flag-yellow));color:#fff;border:0;border-radius:18px;padding:.6rem 1.1rem;box-shadow:0 8px 20px rgba(0,0,0,.35),inset 0 1px 0 rgba(255,255,255,.25);}
.flag-card{border:2px solid var(--flag-yellow);border-radius:20px;background:linear-gradient(145deg,#111,#222);color:#fff;box-shadow:0 20px 45px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.08);}
.navbar.bg-black{background:#000 !important;}