:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --card: #f8fafc;
  --border: rgba(15,23,42,0.12);
  --navbar-bg: #2563eb;
  --navbar-fg: #ffffff;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --fg: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --card: #1e3a8a;
  --border: rgba(255,255,255,0.08);
  --navbar-bg: #1e3a8a;
  --navbar-fg: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  transition: background 0.2s ease, color 0.2s ease;
  line-height: 1.7;
}

nav {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1rem 2rem;
	background: var(--navbar-bg);
	color: var(--navbar-fg);
	border-bottom: 1px solid var(--border);
	max-width: 1500px; /* limit navbar width */
	margin: 0 auto; /* center on large screens */
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand img {
  width: 56px;
  height: 56px;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  color: var(--navbar-fg);
}

.brand-text .title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-text .subtitle {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
}

.links {
  display: flex;
  /* gap: 1rem; */
  align-items: center;
  margin-left: auto;
  flex-wrap: wrap;
}

.links a {
  text-decoration: none;
  color: var(--navbar-fg);
  font-weight: 500;
  padding: 0.25rem 0.5rem;
}

#themeToggle {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--navbar-fg);
  padding: 0;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  <!-- padding: 4rem 2rem 5rem; -->
}

.section {
  margin-bottom: 2rem;
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

.card {
  background: linear-gradient(180deg, rgba(37,99,235,0.04), rgba(37,99,235,0.0)), var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem 1rem 2rem 2rem;
  box-shadow: 0 8px 24px rgba(15,23,42,0.08);
}

.card p {
  color: var(--fg);
  line-height: 1.8;
}

.card ul {
  margin: 1rem 0 0;
  padding-left: 1.5rem;
}

.card li {
  margin-bottom: 0.6rem;
  color: var(--fg);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.2rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  transition: background 0.15s ease, transform 0.1s ease, box-shadow 0.1s ease;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

.btn-secondary {
  background: #ffffff;
  color: var(--accent);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(15,23,42,0.15);
}

.btn-group {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

footer {
	background: var(--navbar-bg);
	color: var(--navbar-fg);
	padding: 1.5rem 3rem;
	margin-top: 4rem;
	max-width: 1500px; 
	margin: 0 auto; 
}
.footer-content {
	/* max-width: 1100px; */
	margin: 0 auto;
	display: flex;
	justify-content: space-between;
	align-items: center;
}


.footer-right {
	display: flex;
	gap: 1rem;
}


.footer-right a {
	color: var(--navbar-fg);
	text-decoration: none;
	font-size: 1.25rem;
}