:root {
  --bg: #f7faff;
  --text: #1e2a38;
  --accent: #0077cc;
  --card-bg: #ffffff;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

body.noche {
  --bg: #121212;
  --text: #e0e0e0;
  --accent: #3399ff;
  --card-bg: #1e1e1e;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  transition: background-color 0.3s, color 0.3s;
}

header, nav, footer {
  background-color: #1e2a38;
  color: white;
  padding: 1rem;
  text-align: center;
}

body.noche header,
body.noche nav,
body.noche footer {
  background-color: #0d0d0d;
}

nav a {
  color: white;
  margin: 0 1rem;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}

.toggle-modo {
  position: fixed;
  top: 10px;
  right: 10px;
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  cursor: pointer;
  z-index: 999;
}

main, section {
  padding: 2rem;
}

h1, h2, h3 {
  color: var(--text);
  margin-bottom: 1rem;
}

.galeria {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  padding: 1rem;
}

.producto {
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 1rem;
  text-align: center;
  transition: transform 0.2s, background-color 0.3s;
}

.producto:hover {
  transform: translateY(-5px);
}

.producto img {
  max-width: 100%;
  height: 200px;
  object-fit: contain;
  margin-bottom: 1rem;
}

button {
  background-color: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #005fa3;
}

.finalizar {
  margin-top: 2rem;
  background: #4caf50;
  color: #fff;
  font-weight: bold;
  border: none;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background 0.3s;
}

.finalizar:hover {
  background: #43a047;
}

form {
  max-width: 500px;
  margin: 2rem auto;
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
}

input, textarea {
  width: 100%;
  padding: 0.75rem;
  margin-bottom: 1rem;
  border-radius: 5px;
  border: 1px solid #ccc;
  background-color: white;
  color: #000;
}

footer {
  margin-top: 2rem;
  font-size: 0.9rem;
}

.logo-principal {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 2rem 0;
}

.logo-principal img {
  max-width: 200px;
  height: auto;
}

@media (max-width: 600px) {
  nav {
    flex-direction: column;
  }

  .galeria {
    grid-template-columns: 1fr;
  }

  .toggle-modo {
    top: 5px;
    right: 5px;
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
}