:root { --primario: #1f4b8f; --texto: #1e232b; --suave: #eaf0f9; --linea: #c9d3e0; --alerta: #b42318; }
* { box-sizing: border-box; }
body { margin: 0; background: #f3f5f8; color: var(--texto); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
.caja { max-width: 26rem; margin: 3rem auto; padding: 1.5rem 1.5rem 2rem; background: #fff; border: 1px solid var(--linea); border-radius: 10px; }
h1 { margin: 0 0 1rem; color: var(--primario); font-size: 1.4rem; }
label { display: block; margin: 0 0 1rem; font-weight: 600; font-size: .92rem; }
input[type=text], input[type=email], input[type=password] { display: block; width: 100%; margin-top: .3rem; padding: .6rem .7rem; font: inherit; border: 1px solid var(--linea); border-radius: 6px; }
input:focus { outline: 2px solid var(--primario); outline-offset: 1px; }
button { width: 100%; padding: .7rem; font: inherit; font-weight: 600; color: #fff; background: var(--primario); border: 0; border-radius: 6px; cursor: pointer; }
button:hover { background: #173a70; }
.aviso { padding: .6rem .8rem; background: #fdecea; border: 1px solid #f5c2bd; border-radius: 6px; color: var(--alerta); }
code { background: var(--suave); padding: .1rem .35rem; border-radius: 4px; }
.secreto { display: inline-block; margin: .4rem 0; font-size: 1.05rem; letter-spacing: .05em; }
.uri { word-break: break-all; font-size: .8rem; }
.codigos { list-style: none; padding: 0; columns: 2; }
.codigos li { margin: .3rem 0; }
details { margin: .5rem 0; }
hr { border: 0; border-top: 1px solid var(--linea); margin: 1.2rem 0; }
a { color: var(--primario); }