:root {
  --azul: #2f6fde;
  --azul-osc: #2257b3;
  --naranjo: #f2a33a;
  --texto: #1d2533;
  --suave: #5d6b82;
  --borde: #d6deea;
  --fondo: #eef3fb;
  --error: #c53b3b;
  --ok: #1f8a52;
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px 16px;
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--texto);
  background:
    radial-gradient(circle at 15% 10%, #ffffff 0, transparent 45%),
    radial-gradient(circle at 85% 90%, #dbe7fb 0, transparent 50%),
    var(--fondo);
}

.card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border-radius: 20px;
  padding: 28px 24px;
  box-shadow: 0 10px 30px rgba(31, 60, 120, .12), 0 1px 3px rgba(31, 60, 120, .08);
}

.card h1 { margin: 0 0 4px; font-size: 1.8rem; letter-spacing: -.02em; }
.card a { color: var(--azul); }

.brand { display: flex; gap: 14px; align-items: center; margin-bottom: 20px; }
.logo { width: 64px; height: 64px; flex: none; }
.sub { margin: 0; color: var(--suave); font-size: .95rem; }

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--fondo);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 18px;
}
.tabs button {
  border: 0;
  background: transparent;
  padding: 10px;
  border-radius: 9px;
  font: inherit;
  font-weight: 600;
  color: var(--suave);
  cursor: pointer;
}
.tabs button[aria-selected="true"] { background: #fff; color: var(--texto); box-shadow: 0 1px 3px rgba(0, 0, 0, .1); }

.form { display: grid; gap: 14px; }
.form label { display: grid; gap: 6px; font-weight: 600; font-size: .95rem; }
.form small, .hint { font-weight: 400; color: var(--suave); font-size: .85rem; margin: 0; }

input, select, textarea {
  font: inherit;
  width: 100%;
  padding: 11px 12px;
  border: 1.5px solid var(--borde);
  border-radius: 10px;
  background: #fff;
  color: var(--texto);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--azul); box-shadow: 0 0 0 3px rgba(47, 111, 222, .18); }

button { font: inherit; cursor: pointer; }
.primary, form[action="/api/logout"] button {
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 700;
  color: #fff;
  background: var(--azul);
}
.primary:hover { background: var(--azul-osc); }
.primary:disabled { opacity: .6; cursor: progress; }

.msg { min-height: 1.4em; margin: 14px 0 0; font-size: .95rem; }
.msg.error { color: var(--error); }
.msg.ok { color: var(--ok); }

.foot { max-width: 420px; text-align: center; color: var(--suave); font-size: .85rem; }