:root {
  --bg: #0b0e14;
  --fg: #e6edf3;
  --muted: #9da3aa;
  --primary: #6dcff6;
  --accent: #8fcb74;
  --danger: #f28b82;
  --card: #121621;
  --border: #1f2430;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, "Helvetica Neue", Arial, sans-serif;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(6px);
  background: rgba(18, 22, 33, 0.85);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: center;   /* center nav on desktop */
  gap: 20px;
  padding: 14px 40px;        /* breathing room */
  flex-wrap: wrap;
}

.brand {
  margin-right: auto;        /* push nav to center */
}

.logo-img {
  height: 44px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--fg);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--border);
}

.hamburger {
  display: none;
  font-size: 26px;
  background: none;
  border: none;
  color: var(--fg);
  cursor: pointer;
}

/* Hero Landing */
.hero.landing {
  height: 100vh;
  background: linear-gradient(to bottom right, rgba(109, 207, 246, 0.08), rgba(143, 203, 116, 0.08)),
              url("/assets/images/code-bg.png") center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.overlay {
  background: rgba(18, 22, 33, 0.85);
  padding: 40px;
  border-radius: 12px;
  max-width: 640px;
}

.hero h1 {
  font-size: 2.6rem;
  margin-bottom: 16px;
}

.hero p {
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 24px;
}

.btn-group {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  text-decoration: none;
  font-weight: 500;
}

.btn-primary {
  background: var(--primary);
  color: #0b0e14;
  border-color: transparent;
}

.btn-accent {
  background: var(--accent);
  color: #0b0e14;
  border-color: transparent;
}

/* Footer */
.footer {
  padding: 20px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-inner {
    justify-content: space-between;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    margin-top: 10px;
  }

  .nav-links.show {
    display: flex;
  }

  .hamburger {
    display: block;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .overlay {
    padding: 20px;
  }
}