/* Shared Header — chillcoding.ai
   Used by index.html and all article pages */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-lg, 1.5rem);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo-img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
}

/* Nav links (homepage only — articles hide these) */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg, 1.5rem);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #1e293b;
  text-decoration: none;
}

/* CTA button in nav */
.nav-cta {
  background: var(--color-primary) !important;
  color: #fff !important;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill, 999px);
  font-weight: 600;
  font-size: 0.875rem;
  transition: background 0.2s;
  text-decoration: none;
}
.nav-cta:hover { background: var(--color-primary-dark) !important; }

/* Hamburger toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-header { overflow: visible; }
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg-alt);
    flex-direction: column;
    padding: var(--space-lg, 1.5rem);
    gap: var(--space-md, 1rem);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg, 0 4px 24px rgba(0,0,0,0.08));
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    z-index: 99;
    visibility: hidden;
  }
  .nav-links.open {
    transform: translateY(0);
    visibility: visible;
  }
  .nav-links a { font-size: 1rem; }
}