:root {
  --color-bg: #0f1115;
  --color-bg-alt: #161a21;
  --color-text: #f2f2f2;
  --color-muted: #a6adba;
  --color-accent: #ff5a3c;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

.site-header {
  position: sticky;
  top: 0;
  background: rgba(15, 17, 21, 0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #262b33;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.nav a {
  margin-left: 1.5rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.nav a:hover {
  color: var(--color-text);
}

.hero {
  padding: 6rem 0 5rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: 0 0 1rem;
}

.hero p {
  color: var(--color-muted);
  max-width: 560px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 0.8rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  transition: opacity 0.2s ease;
}

.btn:hover {
  opacity: 0.85;
}

.section {
  padding: 4.5rem 0;
}

.section.alt {
  background: var(--color-bg-alt);
}

.section h2 {
  font-size: 1.8rem;
  margin-bottom: 2rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-bg-alt);
  border: 1px solid #262b33;
  border-radius: 12px;
  padding: 1.8rem;
}

.card h3 {
  margin-top: 0;
}

.site-footer {
  padding: 2rem 0;
  text-align: center;
  color: var(--color-muted);
  border-top: 1px solid #262b33;
  font-size: 0.9rem;
}