*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --azul: #1a6fc4;
  --azul-claro: #e8f1fb;
  --verde: #1D9E75;
  --verde-claro: #e1f5ee;
  --gris: #f4f4f2;
  --gris-borde: #e0dfd8;
  --texto: #1a1a18;
  --texto-suave: #6b6b66;
  --blanco: #ffffff;
  --radio: 12px;
  --sombra: 0 2px 8px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--gris);
  color: var(--texto);
  min-height: 100vh;
  line-height: 1.6;
}

.header {
  background: var(--blanco);
  border-bottom: 1px solid var(--gris-borde);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--azul);
  letter-spacing: -0.5px;
}

.logo span { color: var(--verde); }

.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.card {
  background: var(--blanco);
  border-radius: var(--radio);
  border: 1px solid var(--gris-borde);
  padding: 1.75rem;
  box-shadow: var(--sombra);
}

h1 { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
h2 { font-size: 18px; font-weight: 600; margin-bottom: 1rem; }
p.subtitulo { color: var(--texto-suave); font-size: 14px; margin-bottom: 1.5rem; }

.form-group { margin-bottom: 1.1rem; }
label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 5px; color: var(--texto-suave); }

input, select, textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gris-borde);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  color: var(--texto);
  background: var(--blanco);
  transition: border-color 0.15s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--azul);
}

textarea { resize: vertical; min-height: 80px; }

.btn {
  display: block;
  width: 100%;
  padding: 13px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  text-align: center;
  text-decoration: none;
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--azul); color: white; }
.btn-primary:hover { opacity: 0.9; }
.btn-verde { background: var(--verde); color: white; }
.btn-verde:hover { opacity: 0.9; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--gris-borde);
  color: var(--texto);
}
.btn-outline:hover { background: var(--gris); }

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-nivel { background: var(--azul-claro); color: var(--azul); }
.badge-verde { background: var(--verde-claro); color: var(--verde); }

.nivel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 1rem;
}

.nivel-btn {
  padding: 10px 8px;
  border: 1.5px solid var(--gris-borde);
  border-radius: 8px;
  background: var(--blanco);
  cursor: pointer;
  text-align: center;
  transition: all 0.15s;
  font-size: 13px;
}

.nivel-btn:hover { border-color: var(--azul); background: var(--azul-claro); }
.nivel-btn.selected { border-color: var(--azul); background: var(--azul-claro); color: var(--azul); font-weight: 600; }

.skill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 1rem;
}

.skill-btn {
  padding: 6px 12px;
  border: 1.5px solid var(--gris-borde);
  border-radius: 20px;
  background: var(--blanco);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}

.skill-btn:hover { border-color: var(--verde); background: var(--verde-claro); }
.skill-btn.selected { border-color: var(--verde); background: var(--verde-claro); color: var(--verde); font-weight: 500; }

.historial-item {
  border: 1px solid var(--gris-borde);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 10px;
}

.historial-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.historial-fecha { font-size: 12px; color: var(--texto-suave); }

.divider { height: 1px; background: var(--gris-borde); margin: 1.25rem 0; }

.msg-error { color: #c0392b; font-size: 13px; margin-top: 8px; }
.msg-ok { color: var(--verde); font-size: 13px; margin-top: 8px; }

.qr-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 1.25rem;
  background: var(--gris);
  border-radius: 10px;
  margin-top: 1rem;
}

.link-box {
  background: var(--gris);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  word-break: break-all;
  color: var(--azul);
  margin-top: 8px;
}

nav.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 1.5rem;
  background: var(--blanco);
  border: 1px solid var(--gris-borde);
  border-radius: 10px;
  padding: 4px;
}

nav.tabs a {
  flex: 1;
  text-align: center;
  padding: 8px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  color: var(--texto-suave);
  transition: all 0.15s;
}

nav.tabs a.active {
  background: var(--azul);
  color: white;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

@keyframes spin { to { transform: rotate(360deg); } }