:root {
  --azul: #1d3a73;
  --azul-claro: #2a55a8;
  --amarillo: #f4c842;
  --texto: #222;
  --texto-suave: #666;
  --fondo: #f5f7fb;
  --tarjeta: #fff;
  --borde: #e1e5ee;
  --error: #c0392b;
  --error-bg: #fdecea;
  --max: 720px;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--texto);
  background: var(--fondo);
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

.topbar {
  background: var(--azul);
  color: #fff;
  padding: 0.9rem 0;
}

.topbar .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
}

.topbar-link {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 0.9rem;
}

.topbar-link:hover { color: #fff; }

.container {
  flex: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.card {
  background: var(--tarjeta);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
}

.card--narrow { max-width: 420px; margin: 2rem auto; }

h1 {
  color: var(--azul);
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

h2 {
  color: var(--azul);
  margin: 1.5rem 0 0.5rem;
  font-size: 1.2rem;
}

.muted { color: var(--texto-suave); font-size: 0.95rem; }

.form { display: flex; flex-direction: column; gap: 0.6rem; margin-top: 1rem; }

.form label { font-weight: 600; color: var(--azul); font-size: 0.95rem; }

.form input[type="password"] {
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--borde);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
}

.form input[type="password"]:focus {
  outline: 2px solid var(--azul-claro);
  outline-offset: 1px;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.4rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: opacity 0.15s, transform 0.05s;
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--azul);
  color: #fff;
}

.btn--primary:hover:not(:disabled) { background: var(--azul-claro); }

.btn--primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn--ghost {
  background: transparent;
  color: var(--azul);
  border: 1px solid var(--borde);
  margin-left: 0.5rem;
}

.btn--ghost:hover { background: var(--fondo); }

.dropzone {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  border: 2px dashed var(--borde);
  border-radius: 12px;
  padding: 2rem 1.25rem;
  background: var(--fondo);
  margin-top: 1.25rem;
}

.dropzone__label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-align: center;
  cursor: pointer;
}

.dropzone__label strong { color: var(--azul); font-size: 1.05rem; }

.dropzone input[type="file"] {
  display: block;
  margin: 0 auto;
  font-family: inherit;
}

.status { margin-top: 2rem; }

.progress {
  width: 100%;
  height: 8px;
  background: var(--borde);
  border-radius: 4px;
  overflow: hidden;
  margin: 0.75rem 0;
}

.progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--azul) 0%, var(--azul-claro) 100%);
  width: 0%;
  transition: width 0.4s ease;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin: 0.75rem 0;
  font-size: 0.95rem;
}

.alert--error {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid #f5b7b1;
}

.footer {
  background: #fff;
  border-top: 1px solid var(--borde);
  padding: 1rem 0;
  color: var(--texto-suave);
  font-size: 0.85rem;
  text-align: center;
  margin-top: 2rem;
}

@media (max-width: 500px) {
  .card { padding: 1.5rem 1.25rem; }
  .container { padding: 1.25rem 1rem; }
  h1 { font-size: 1.3rem; }
}