/* === Theme variables === */
:root {
  --bg: #fafafa;
  --text: #222;
  --accent: #0073e6;
  --card-bg: #fff;
  --card-border: #ddd;
  --card-hover-bg: var(--accent);
  --card-hover-text: #fff;
}

[data-theme="dark"] {
  --bg: #121212;
  --text: #eaeaea;
  --accent: #4da3ff;
  --card-bg: #1e1e1e;
  --card-border: #333;
  --card-hover-bg: #4da3ff;
  --card-hover-text: #000;
}

/* === Global === */
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, sans-serif;
  margin: 0;
  line-height: 1.6;
}

/* === Navigation === */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--card-border);
  background: var(--card-bg);
}

nav h1 {
  font-size: 1.25rem;
  letter-spacing: 0.05em;
  margin: 0;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
}

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

/* === Theme toggle button === */
#theme-toggle {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text);
  transition: transform 0.2s ease, color 0.2s ease;
}

#theme-toggle:hover {
  transform: rotate(20deg);
  color: var(--accent);
}

/* === Hero === */
.hero {
  text-align: center;
  padding: 3rem 1rem;
  background: var(--card-bg);
}

.hero h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text);
}

/* === Portal grid === */
.portal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  padding: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.card {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--card-bg);
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  transition: all 0.2s ease;
}

.card:hover {
  background: var(--card-hover-bg);
  color: var(--card-hover-text);
  transform: translateY(-3px);
}

/* === Footer === */
footer {
  text-align: center;
  padding: 1rem;
  border-top: 1px solid var(--card-border);
  background: var(--card-bg);
  margin-top: 2rem;
  font-size: 0.9rem;
}