/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid #e5e7eb;
  transition: top 0.25s ease, background 0.2s ease, border-color 0.2s ease;
}

.header-shell {
  width: min(92%, 1100px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 0;
  transition: background 0.2s ease, box-shadow 0.25s ease, border-radius 0.25s ease, padding 0.2s ease;
}

/* Floating capsule on scroll */
.site-header.is-floating { 
  top: 12px; 
  background: transparent; 
  border-bottom-color: transparent; 
}

.site-header.is-floating .header-shell {
  background: var(--color-surface);
  border-radius: 9999px;
  /* Extra inner spacing when floating */
  padding: 0.8rem 1.25rem;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12), 0 0 0 1px rgba(15, 23, 42, 0.06);
}

/* Brand */
.brand {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(1.05rem, 0.7rem + 1vw, 1.35rem);
  color: var(--color-text);
}

.brand__tagline {
  margin-top: 0.1rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  font-weight: 600;
}

/* Hide tagline when header is floating (on scroll) */
.site-header.is-floating .brand__tagline { display: none; }

/* Center nav */
.primary-nav {
  display: flex;
  justify-content: center;
  gap: clamp(1rem, 3vw, 2rem);
}

.nav-link {
  color: var(--color-muted);
  font-weight: 600;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-accent);
}

/* CTA */
.header-cta-group {
  justify-self: end;
  display: inline-flex;
  gap: 0.4rem;
}

.cta-link {
  background: #000; /* solid black */
  color: #fff;
  padding: 0.55rem 1.05rem;
  border-radius: 9999px;
  font-weight: 700;
  transition: transform 0.15s ease, background 0.2s ease;
}

.cta-link:hover {
  transform: translateY(-1px);
}

.cta-link:focus-visible {
  outline: 2px solid #6366f1;
  outline-offset: 2px;
}

/* Hamburger (mobile) */
.hamburger {
  display: none;
  justify-self: end;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
}

.hamburger-box {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
}

.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.hamburger-inner::before { transform: translateY(-6px); }
.hamburger-inner::after { transform: translateY(6px); }

/* Active state */
.hamburger[aria-expanded="true"] .hamburger-inner {
  transform: rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger-inner::before {
  transform: rotate(90deg);
}

.hamburger[aria-expanded="true"] .hamburger-inner::after {
  opacity: 0;
}

/* Mobile menu panel */
.mobile-menu[hidden] { display: none !important; }

.mobile-menu {
  display: none; /* toggled by JS (hidden attribute) */
  border-bottom: 1px solid #e5e7eb;
  background: var(--color-surface);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.mobile-nav {
  width: min(92%, 1100px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.75rem 0 1rem;
}

.mobile-link {
  color: var(--color-text);
  font-weight: 600;
  padding: 0.5rem 0;
}

.mobile-cta {
  align-self: start;
  display: inline-block;
  margin-top: 0.25rem;
  background: #000; /* solid black */
  color: #fff;
  padding: 0.55rem 1.05rem;
  border-radius: 9999px;
  font-weight: 700;
}

/* Responsive */
@media (max-width: 768px) {
  .header-shell {
    grid-template-columns: 1fr auto;
  }

  /* Disable floating capsule on mobile */
  .site-header.is-floating { top: 0; }
  .site-header.is-floating .header-shell {
    background: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0.9rem 0;
  }

  .primary-nav,
  .header-cta-group {
    display: none;
  }

  .hamburger {
    display: inline-grid;
  }

  .mobile-menu { display: block; }

  /* Collapsed mobile header (hide brand, keep only hamburger) */
  .site-header.is-collapsed .brand { display: none; }
  .site-header.is-collapsed .header-shell {
    grid-template-columns: auto;        /* no empty column */
    justify-items: end;                 /* push hamburger to right */
    width: auto;                        /* shrink to content */
    margin: 0 0.6rem 0 auto;            /* stick to right edge */
    padding: 0;                         /* remove inner padding */
    background: transparent;            /* no background capsule */
    box-shadow: none;                   /* remove any shadow */
    border-radius: 0;
  }
  .site-header.is-collapsed {
    background: transparent;
    border-bottom-color: transparent;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  .site-header.is-collapsed .hamburger { justify-self: end; }
}

/* Prevent scroll when mobile menu open */
body.no-scroll { overflow: hidden; }