/* Header relies on :root variables from home.css */

.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgb(121 151 176 / 72%);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  gap: 1rem;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 900;
  letter-spacing: 0.2px;
}

.brand-mark{
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.95), rgba(255,255,255,0.0) 60%),
    linear-gradient(135deg, var(--accent-strong), var(--accent-2));
  box-shadow: 0 0 0 4px rgb(73 110 255 / 18%);
}

.brand-text{ font-size: 1.05rem; }

/* Desktop nav */
.site-nav ul{
  list-style: none;
  display: flex;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.site-nav a{
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  color: var(--muted);
  transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.site-nav a:hover{
  color: var(--text);
  background: rgba(255,255,255,0.08);
  transform: translateY(-1px);
}

.nav-cta{
  color: var(--text) !important;
  border: 1px solid rgb(73 110 255 / 28%);
  background: linear-gradient(135deg, var(--accent-strong), var(--accent-2));
}

/* Mobile nav (CSS-only) */
.nav-toggle{ display: none; }

.nav-toggle-label{
  display: none;
  width: 44px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.06);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after{
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: rgba(255,255,255,0.85);
  border-radius: 999px;
  position: relative;
  transition: transform 0.2s ease, top 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-label span::before{ position: absolute; top: -6px; left: 0; }
.nav-toggle-label span::after{ position: absolute; top: 6px; left: 0; }

@media (max-width: 820px){
  .nav-toggle-label{ display: inline-flex; }

  .site-nav{
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: rgba(14, 16, 22, 0.92);
    border-bottom: 1px solid var(--line);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .site-nav ul{
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
  }

  .site-nav a{
    border-radius: 14px;
    justify-content: center;
    width: 100%;
  }

  .header-inner{ position: relative; }

  .nav-toggle:checked ~ .site-nav{
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle:checked + .nav-toggle-label span{ opacity: 0; }
  .nav-toggle:checked + .nav-toggle-label span::before{ top: 0; transform: rotate(45deg); }
  .nav-toggle:checked + .nav-toggle-label span::after{ top: 0; transform: rotate(-45deg); }
}