:root {
  --bg: #0f0f10;
  --bg-soft: #1b1b20;
  --card: #1a1a1d;
  --text: #f5f5f7;
  --muted: #a0a0a5;
  --accent: #4da3ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(circle at top, var(--bg-soft), var(--bg));
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}

header {
  padding: 24px;
  border-bottom: 1px solid #222;
}

nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

nav a {
  color: var(--text);
  font-weight: 500;
  opacity: 0.85;
}

nav a:hover {
  opacity: 1;
}

.container {
  max-width: 1040px;
  padding: 48px 20px;
  margin: auto;
}

h1 {
  font-size: 2.6rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.8rem;
  margin-top: 48px;
}

h3 {
  margin-top: 0;
}

p {
  max-width: 70ch;
}

.muted {
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card);
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
}

.card img {
  width: 100%;
  display: block;
}

.card-content {
  padding: 16px;
}

ul {
  padding-left: 18px;
}

footer {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: var(--card);
  max-width: 900px;
  width: 92%;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: 10px;
  padding: 28px;
}

.modal-close {
  text-align: right;
  font-size: 16px;
  cursor: pointer;
  color: var(--muted);
}

iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  margin: 16px 0;
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  justify-content: center;
  align-items: center;
  z-index: 1100;
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
}

/* Responsive */
@media (max-width: 600px) {
  header {
    padding: 16px;
  }

  h1 {
    font-size: 2.1rem;
  }
}