:root {
  --bg-dark: #0a0033;
  --bg-light: #f0f2fa;
  --text-light: #eee;
  --text-dark: #111;
  --accent: #7f5af0;
  --accent-light: #a085ff;
  --neon-glow: #7f5af0cc;
}

html, body {
  margin: 0; padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-light);
  transition: background-color 0.4s, color 0.4s;
  min-height: 100vh;
}

[data-theme="light"] {
  --bg-dark: #f0f2fa;
  --bg-light: #0a0033;
  --text-light: #111;
  --text-dark: #eee;
  --accent: #7f5af0;
  --accent-light: #a085ff;
  --neon-glow: #7f5af0cc;
}

nav {
  position: sticky;
  top: 0;
  background: linear-gradient(90deg, #23004b, #2f0069);
  padding: 0.5em 2em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1000;
  box-shadow: 0 2px 10px var(--neon-glow);
}

.logo {
  font-weight: 900;
  font-size: 1.8rem;
  color: var(--accent);
  letter-spacing: 3px;
  user-select: none;
  cursor: default;
}

.nav-links {
  display: flex;
  gap: 1.3em;
  align-items: center;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-light);
  text-decoration: none;
  font-weight: 600;
  position: relative;
  transition: color 0.3s ease;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--accent-light);
}

.nav-links button#themeBtn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-light);
  cursor: pointer;
  transition: color 0.3s ease;
}

.nav-links button#themeBtn:hover {
  color: var(--accent-light);
}

main {
  padding: 2em 3em;
  max-width: 900px;
  margin: auto;
}

h1, h2, h3 {
  font-weight: 900;
  margin-bottom: 0.4em;
  color: var(--accent);
}

p {
  line-height: 1.6;
  margin-bottom: 1.2em;
}

section {
  margin-bottom: 3em;
}

/* Buttons neon/glass */
.btn-neon {
  display: inline-block;
  padding: 0.8em 2em;
  border: none;
  color: white;
  background: var(--accent);
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  box-shadow:
    0 0 8px var(--accent),
    0 0 15px var(--accent),
    0 0 20px var(--accent-light);
  transition: box-shadow 0.3s ease;
  text-decoration: none;
  user-select: none;
}

.btn-neon:hover {
  box-shadow:
    0 0 15px var(--accent-light),
    0 0 30px var(--accent-light),
    0 0 40px var(--accent-light);
}

.btn-glass {
  background: rgba(255 255 255 / 0.1);
  border-radius: 14px;
  border: 1px solid rgba(255 255 255 / 0.2);
  color: var(--text-light);
  padding: 0.7em 1.5em;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: background 0.3s ease, border-color 0.3s ease;
  user-select: none;
}

.btn-glass:hover {
  background: rgba(255 255 255 / 0.3);
  border-color: var(--accent-light);
  color: var(--accent-light);
}

/* Cards for models on index */
.cards {
  display: flex;
  gap: 2em;
  justify-content: center;
  flex-wrap: wrap;
}

.card {
  background: rgba(127, 90, 240, 0.15);
  border-radius: 16px;
  box-shadow: 0 0 20px var(--neon-glow);
  padding: 1em;
  width: 260px;
  text-align: center;
  transition: transform 0.3s ease;
  cursor: pointer;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 0 35px var(--accent-light);
}

.card img {
  max-width: 100%;
  border-radius: 12px;
  margin-bottom: 1em;
}

/* Preview box on generator */
.preview-box {
  margin-top: 1.5em;
  background: rgba(127, 90, 240, 0.1);
  padding: 1em;
  border-radius: 12px;
  min-height: 200px;
  overflow: auto;
  box-shadow: 0 0 15px var(--neon-glow);
}

/* Responsive */
@media (max-width: 720px) {
  nav {
    flex-wrap: wrap;
  }
  .nav-links {
    justify-content: center;
    gap: 1em;
  }
  main {
    padding: 1em 1.2em;
  }
  .cards {
    flex-direction: column;
    align-items: center;
  }
  .card {
    width: 90%;
  }
}