/* ---------- Base ---------- */
:root {
  --bg: #fafafa;
  --text: #222;
  --card: #ffffff;
  --accent: #ff5a5a;
}

body.dark {
  --bg: #0e0e11;
  --text: #e6e6e6;
  --card: #1a1a1f;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: 0.3s;
}

/* ---------- Header ---------- */
header {
  text-align: center;
  padding: 4rem 1rem;
}

h1, h2 {
  font-family: 'Manga Style', sans-serif;
  letter-spacing: 1px;
}

.subtitle {
  opacity: 0.8;
}

/* ---------- Nav ---------- */
nav {
  position: sticky;
  top: 0;
  background: var(--card);
  padding: 1rem;
  text-align: center;
  border-bottom: 1px solid #ddd;
}

nav a {
  margin: 0 1rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
}

nav a:hover {
  color: var(--accent);
}

/* ---------- Layout ---------- */
section {
  max-width: 800px;
  margin: auto;
  padding: 3rem 1.5rem;
}

.card {
  background: var(--card);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

/* ---------- Footer ---------- */
footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.9rem;
  opacity: 0.7;
}

/* ---------- Button ---------- */
button {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
}