:root {
  --bg-dark: #0b1220;
  --text-light: #e5e7eb;
  --accent: #1e90ff;
  --card-bg: #111827;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.6;
}

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

header, section {
  max-width: 1100px;
  margin: auto;
  padding: 4rem 2rem;
}

/* Breadcrumb */
.breadcrumb {
  max-width: 1100px;
  margin: auto;
  padding: 1.5rem 2rem 0;
  font-size: 0.9rem;
  color: #94a3b8;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.breadcrumb a {
  color: var(--accent);
}

.breadcrumb .current {
  color: #c7d2fe;
}

/* Hero */
.hero {
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  max-width: 700px;
  margin: auto;
  margin-bottom: 2rem;
  color: #c7d2fe;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  font-weight: 600;
  border: 1px solid var(--accent);
  margin: 0.4rem;
}

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

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

/* Sections */
section h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
}

/* Cards */
.grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  height: 260px;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(30,144,255,0.25);
}

/* Images */
.img-placeholder {
  height: 160px;
  background: #020617;
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.img-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Code blocks */
pre {
  background-color: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  overflow-x: auto;
  color: #e5e7eb;
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 1rem;
  font-size: 0.9rem;
  color: #94a3b8;
  background-color: #020617;
}

@media (max-width: 800px) {
  .hero h1 {
    font-size: 2.2rem;
  }
}