:root {
  --bg: #0b1220;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #2563eb;
  --border: #1f2937;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 40px;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

header b {
  font-size: 18px;
}

nav a {
  color: var(--muted);
  margin-left: 20px;
  text-decoration: none;
  font-size: 14px;
  transition: 0.2s;
}

nav a:hover {
  color: white;
}

/* HERO */
.hero {
  text-align: center;
  padding: 100px 20px;
}

.hero h1 {
  font-size: 42px;
  margin-bottom: 20px;
}

.hero p {
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 30px;
}

.btn {
  display: inline-block;
  background: var(--primary);
  padding: 12px 24px;
  border-radius: 8px;
  color: white;
  text-decoration: none;
  font-size: 14px;
  transition: 0.2s;
}

.btn:hover {
  opacity: 0.85;
}

/* SECTION */
.section {
  padding: 60px 40px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: 0.2s;
}

.card:hover {
  transform: translateY(-3px);
  border-color: #374151;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 30px;
  font-size: 12px;
  color: #6b7280;
  border-top: 1px solid var(--border);
}

/* LOADING (добавляет реалистичность) */
.loading {
  opacity: 0.6;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { opacity: 0.4; }
  50% { opacity: 0.9; }
  100% { opacity: 0.4; }
}