/* php-calculadora-interes-compuesto */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#0f172a;--surface:#1e293b;--text:#f1f5f9;--muted:#94a3b8;--primary:#3b82f6;--success:#10b981;--border:#334155;--radius:8px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
header{background:linear-gradient(135deg,#1e293b,#334155);padding:2rem 1rem;text-align:center}
header h1{font-size:1.8rem;margin-bottom:.5rem}
.subtitle{color:var(--muted)}
main{max-width:600px;margin:2rem auto;padding:0 1rem}
label{display:block;margin:1.2rem 0 .5rem;font-weight:600}
input,select{width:100%;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);padding:.7rem 1rem;font-size:.95rem}
input:focus,select:focus{outline:2px solid var(--primary);border-color:var(--primary)}
button,.btn-primary{width:100%;padding:.8rem 1.4rem;border:none;border-radius:var(--radius);cursor:pointer;font-size:1rem;font-weight:600;margin-top:1.5rem;background:var(--primary);color:#fff;transition:all .2s}
.btn-primary:hover{background:#2563eb;transform:translateY(-1px)}
.resultados{margin-top:2rem}
.resultados h2{font-size:1.2rem;margin-bottom:1rem}
.tarjeta-destacada{display:flex;flex-direction:column;align-items:center;padding:1.5rem;border-radius:var(--radius);margin-bottom:1rem;background:linear-gradient(135deg,#052e1a,#10b981)}
.tarjeta-destacada .etiqueta{font-size:.85rem;text-transform:uppercase;opacity:.8;letter-spacing:1px}
.valor-grande{font-size:2.5rem;font-weight:700;margin-top:.25rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem;margin-bottom:1rem}
.tarjeta-sm{background:var(--surface);padding:1rem;border-radius:var(--radius);text-align:center;border:1px solid var(--border)}
.tarjeta-sm .etiqueta{display:block;font-size:.75rem;color:var(--muted);text-transform:uppercase}
.tarjeta-sm .valor-sm{display:block;font-size:1.1rem;font-weight:700;margin-top:.25rem}
.pos{color:#86efac}
.interpretacion{background:var(--surface);padding:1rem;border-radius:var(--radius);border-left:4px solid var(--primary);font-size:.95rem}
.info{background:var(--surface);padding:1.5rem;border-radius:var(--radius);margin-top:2rem;border-left:4px solid var(--primary)}
.info h2{font-size:1.2rem;margin-bottom:.5rem}
.info p{color:var(--muted);margin-bottom:.5rem}
.info strong{color:var(--text)}
.formula{background:#0f172a;padding:.8rem;border-radius:6px;font-family:"Cascadia Code",Consolas,monospace;color:#93c5fd;text-align:center;font-size:.95rem}
footer{text-align:center;padding:2rem 1rem;color:var(--muted);border-top:1px solid var(--border);margin-top:2rem}
footer a{color:var(--primary);text-decoration:none}
footer a:hover{text-decoration:underline}
@media(max-width:600px){header h1{font-size:1.4rem}.grid-3{grid-template-columns:1fr}}