/* Reset & base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background-color: white;
  color: black;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* Container */
.container {
  max-width: 960px;
  margin: auto;
  padding: 1rem;
}

/* Header */
header {
  background: #f0f0f0;
  padding: 1rem 0;
  border-bottom: 1px solid #ddd;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

header h1 a {
  text-decoration: none;
  color: inherit;
}

nav {
  display: flex;
  gap: 1rem;
}

nav a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background 0.2s;
}

nav a:hover {
  background: #ddd;
}

/* Theme toggle */
.theme-toggle {
  margin-left: 1rem;
}

.theme-toggle label {
  font-size: 0.9rem;
  cursor: pointer;
}

.theme-toggle input {
  margin-right: 0.25rem;
}

/* Hero section */
.hero {
  text-align: center;
  padding: 4rem 1rem;
  background: #fafafa;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
}

/* Project cards */
.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  margin-top: 1rem;
}

.card {
  background: #f9f9f9;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid #e1e1e1;
  transition: background 0.2s;
}

.card:hover {
  background: #eee;
}

/* Form */
form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

form input,
form textarea {
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
}

form button {
  padding: 0.75rem;
  background: #333;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.2s;
}

form button:hover {
  background: #111;
}

/* Footer */
footer {
  background: #f0f0f0;
  padding: 1rem;
  text-align: center;
  border-top: 1px solid #ddd;
  margin-top: 2rem;
}

/* Mobile nav (burger toggle if needed) */
#menu-toggle,
.menu-icon {
  display: none;
}

/* Dark mode with :has() — requires modern browser */
body:has(#dark-toggle:checked) {
  background: #121212;
  color: #f0f0f0;
}

body:has(#dark-toggle:checked) header,
body:has(#dark-toggle:checked) footer {
  background: #1e1e1e;
}

body:has(#dark-toggle:checked) nav a {
  color: #ccc;
}

body:has(#dark-toggle:checked) nav a:hover {
  background: #333;
}

body:has(#dark-toggle:checked) .hero {
  background: #1a1a1a;
}

body:has(#dark-toggle:checked) .card {
  background: #222;
  border-color: #333;
}

body:has(#dark-toggle:checked) form input,
body:has(#dark-toggle:checked) form textarea {
  background: #1e1e1e;
  color: #f0f0f0;
  border-color: #444;
}

body:has(#dark-toggle:checked) form button {
  background: #555;
}

body:has(#dark-toggle:checked) form button:hover {
  background: #333;
}

/* Responsive tweaks */
@media (max-width: 600px) {
  nav {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
}