/* ============================================================
   MoodPathways — header.css
   Site header, navigation, brand
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--clr-border);
  transition: box-shadow var(--transition);
}
@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(17,31,45,.92);
  }
}
.site-header.scrolled { box-shadow: var(--shadow); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: .85rem;
  flex-wrap: wrap;
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  text-decoration: none;
  color: var(--clr-ink);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -.01em;
  flex-shrink: 0;
}
.brand:hover { color: var(--clr-primary); }
.brand-logo {
  width: 36px;
  height: 36px;
  background: var(--clr-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.brand-logo svg {
  width: 22px;
  height: 22px;
}
.brand small {
  font-family: var(--font-sans);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--clr-accent);
  background: var(--clr-accent-l);
  padding: .12rem .55rem;
  border-radius: var(--radius-full);
  vertical-align: middle;
}

/* Nav */
.nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .15rem;
  align-items: center;
  margin: 0;
  padding: 0;
}
.nav li { display: contents; }
.nav a,
.nav .linklike {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .42rem .8rem;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 500;
  color: var(--clr-ink-soft);
  text-decoration: none;
  background: none;
  border: 0;
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.nav a:hover,
.nav .linklike:hover {
  color: var(--clr-ink);
  background: var(--clr-surface-alt);
}
.nav a[aria-current="page"] {
  color: var(--clr-primary);
  background: var(--clr-primary-xl);
  font-weight: 600;
}

/* Sign-in CTA in nav */
.nav .btn {
  margin-left: .4rem;
}

/* Mobile hamburger (progressive enhancement) */
@media (max-width: 640px) {
  .header-inner { padding-block: .7rem; }
  .nav { gap: .1rem; }
  .nav a, .nav .linklike { padding: .38rem .6rem; font-size: .85rem; }
}