:root{--fondo-principal:#0a0a0a;--fondo-tarjetas:#1a1a1a;--acento-principal:#39ff14;--acento-secundario:#1b4d1b;--texto-principal:#fff;--texto-secundario:#a0a0a0;--error:#ff3131;--fuente:"Segoe UI", Roboto, Helvetica, Arial, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--fuente);background-color:var(--fondo-principal);color:var(--texto-principal);min-height:100vh}a{color:var(--acento-principal);text-decoration:none}button{font-family:var(--fuente);cursor:pointer}.btn-primary{background-color:var(--acento-principal);color:#000;border:none;border-radius:8px;padding:.75rem 1.5rem;font-size:1rem;font-weight:700;transition:all .2s}.btn-primary:hover{background-color:#2ecc10;transform:translateY(-2px)}.btn-secondary{color:var(--acento-principal);border:2px solid var(--acento-principal);background-color:#0000;border-radius:8px;padding:.75rem 1.5rem;font-size:1rem;font-weight:700;transition:all .2s}.btn-secondary:hover{background-color:var(--acento-principal);color:#000}.card{background-color:var(--fondo-tarjetas);border:1px solid var(--acento-secundario);border-radius:12px;padding:1.5rem}