:root {
  --primary: #BB86FC;
  --secondary: #03DAC5;
  --bg: #121212;
  --surface: #1E1E1E;
  --surface2: #2A2A2A;
  --text: #E6E6E6;
  --placeholder: #8A8A8A;
  /* radios y huecos proporcionales reutilizables */
  --radius: clamp(0.5rem, 2vw, 0.75rem);
  --gap: clamp(0.4rem, 2vw, 0.75rem);
}

* { box-sizing: border-box; }

/* escala global: equivale a tener el zoom al 110% (todo lo demás usa rem) */
html { font-size: 110%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
  padding: clamp(0.75rem, 3vw, 1.5rem);
}

.card {
  background: var(--surface);
  border-radius: clamp(0.75rem, 3vw, 1.25rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  width: 100%;
  max-width: min(92vw, 38rem);
  box-shadow: 0 0.5rem 1.9rem rgba(0, 0, 0, .4);
}

h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  color: var(--primary);
  text-align: center;
}

.subtitle {
  margin: 0.3em 0 1.6em;
  text-align: center;
  color: var(--secondary);
  font-size: clamp(0.9rem, 2vw, 1.15rem);
}

label {
  display: block;
  margin: 1.1em 0 0.45em;
  font-size: clamp(0.85rem, 1.6vw, 1rem);
  color: var(--placeholder);
}

input[type="text"], textarea {
  width: 100%;
  padding: clamp(0.65rem, 1.6vw, 0.85rem) clamp(0.75rem, 1.8vw, 1rem);
  background: var(--surface2);
  border: 1px solid #3a3a3a;
  border-radius: var(--radius);
  color: var(--text);
  font-size: clamp(1rem, 1.6vw, 1.2rem);   /* mín 16px: evita el zoom de iOS */
  font-family: inherit;
}

textarea {
  resize: vertical;
  min-height: 2.6em;
  line-height: 1.4;
}

input[type="text"]:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
}

input[type="text"]::placeholder, textarea::placeholder { color: var(--placeholder); }

.opt {
  color: #6a6a6a;
  font-size: .8em;
  font-style: italic;
}

.secondary {
  display: block;
  margin: 0.5em 0 0 auto;
  padding: clamp(0.45rem, 2vw, 0.55rem) clamp(0.8rem, 3vw, 1.15rem);
  background: var(--surface2);
  border: 1px solid #3a3a3a;
  border-radius: var(--radius);
  color: var(--text);
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}

.secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.file-row {
  margin-top: var(--gap);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--gap);
}

.file-row .secondary { margin: 0; flex-shrink: 0; }

.file-name {
  flex: 1;
  min-width: 0;
  color: #ffffff;
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: var(--gap);
}

.seg {
  display: flex;
  gap: clamp(0.25rem, 1vw, 0.4rem);
  background: var(--surface2);
  padding: 0.25rem;
  border-radius: var(--radius);
}

.seg button {
  flex: 1;
  padding: clamp(0.5rem, 2.2vw, 0.6rem) 0.2rem;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius) - 0.2rem);
  color: var(--placeholder);
  font-size: clamp(0.82rem, 1.5vw, 1rem);
  cursor: pointer;
  transition: background .15s, color .15s;
}

.seg button.active {
  background: var(--primary);
  color: #1a1a1a;
  font-weight: 600;
}

.primary {
  width: 100%;
  margin-top: clamp(1rem, 4vw, 1.5rem);
  padding: clamp(0.7rem, 3vw, 0.85rem);
  background: var(--primary);
  border: none;
  border-radius: var(--radius);
  color: #1a1a1a;
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  font-weight: 600;
  cursor: pointer;
}

.primary:disabled { opacity: .5; cursor: default; }

.status {
  margin: clamp(0.8rem, 3vw, 1.1rem) 0 0;
  min-height: 1.2em;
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  text-align: center;
  word-break: break-word;
}

.status.ok { color: var(--secondary); }
.status.error { color: #CF6679; }

.links-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: clamp(0.6rem, 2vw, 1rem);
  text-align: center;
  font-size: clamp(0.8rem, 1.5vw, 0.95rem);
  color: var(--placeholder);
}

.links-footer a {
  color: var(--primary);
  text-decoration: none;
}

.links-footer a:hover { text-decoration: underline; }
.links-footer span { margin: 0 0.5em; }

@media (max-width: 32rem) {
  body {
    justify-content: flex-start;
    padding: 0.75rem;
  }
  .card {
    max-width: 100%;
    padding: clamp(1.1rem, 5vw, 1.6rem);
  }
  /* en móvil los dos campos opcionales van apilados */
  .grid { grid-template-columns: 1fr; }
  /* el nombre del archivo ocupa su propia línea completa */
  .file-name { flex-basis: 100%; order: 3; }
  /* en móvil el footer va en flujo normal (fijo tapaba el contenido al scrollear) */
  .links-footer {
    position: static;
    margin-top: clamp(1.5rem, 6vw, 2.5rem);
  }
}