:root{
  --bg:#0b0d10;
  --panel:#11151b;
  --panel2:#0c1015;
  --border:#1f2630;
  --border2:#2a3442;
  --text:#eef2f6;
  --muted:#aab6c5;

  --accent:#4aa3ff;
  --accent-hover:#7bbcff;

  --radius:16px;

  /* Fuerza tema oscuro en controles nativos */
  color-scheme: dark;
}

*{box-sizing:border-box}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
}

.app-header{
  padding:18px 16px;
  border-bottom:1px solid var(--border);
}

h1{margin:0;font-size:22px}
h2{margin:0 0 10px}
h3{margin:16px 0 8px}
h4{margin:12px 0 6px}

.subtle{
  color:var(--muted);
  font-size:13px;
}

.grid{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:14px;
  padding:14px;
  max-width:1100px;
  margin:auto;
}

.card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
}

.row{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:12px;
}

label{
  display:grid;
  gap:6px;
  font-size:13px;
}

/* =========================
   INPUTS
========================= */

input,
select,
textarea{
  height:48px;
  padding:10px 12px;
  border-radius:14px;
  border:1px solid var(--border2);
  background:var(--panel2);
  color:var(--text);
  font-size:15px;
  color-scheme: dark;
}

input:focus,
select:focus,
textarea:focus{
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(74,163,255,0.15);
}

/* =========================
   NUMBER INPUT — FLECHAS GRANDES Y PEGADAS
========================= */

/* Firefox: no permite custom; limpio */
input[type="number"]{
  -moz-appearance:textfield;
  padding-right:56px; /* espacio exacto para spinner ancho */
}

/* Chrome / Edge / Safari */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button{
  opacity:1;
  margin:0;
  width:40px;          /* 🔥 MÁS ANCHO */
  height:48px;         /* igual al input */
  cursor:pointer;

  /* Fondo oscuro continuo */
  background:var(--panel2);

  /* Pegado total al borde */
  border-left:1px solid var(--border2);

  /* Evita tema claro */
  color-scheme: dark;
}

/* Hover */
input[type="number"]::-webkit-inner-spin-button:hover,
input[type="number"]::-webkit-outer-spin-button:hover{
  background:#10151c;
}

/* Active */
input[type="number"]::-webkit-inner-spin-button:active,
input[type="number"]::-webkit-outer-spin-button:active{
  background:#0b1016;
}

/* =========================
   BOTONES / RESULTADOS
========================= */

.copybox{
  display:grid;
  grid-template-columns:1fr auto;
  gap:10px;
}

.btn{
  height:48px;
  padding:0 18px;
  border-radius:14px;
  border:1px solid var(--border2);
  background:#18212c;
  color:var(--text);
  cursor:pointer;
}

.result{
  margin-top:12px;
  padding:14px;
  border:1px solid var(--border);
  border-radius:14px;
  background:var(--panel2);
}

.big{
  font-size:20px;
  font-weight:700;
}

.mono{
  font-family:ui-monospace,monospace;
}

/* =========================
   ALERTAS
========================= */

.alert{
  margin-top:8px;
  padding:10px;
  border-radius:12px;
  font-size:13px;
}

.alert.high{background:#5b1b1b}
.alert.warn{background:#5a4a12}
.alert.info{background:#1f3f64}

@media(max-width:900px){
  .grid{grid-template-columns:1fr}
  .row{grid-template-columns:1fr}
}