/* ===========================
   BENTOPIA — Header
   =========================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 2rem;
  gap: 1.5rem;

  background: rgba(18, 7, 18, 0.72);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--color-border);

  transition: background 0.3s var(--ease-out);
}

.site-header.scrolled {
  background: rgba(12, 4, 12, 0.92);
  border-bottom-color: rgba(18, 224, 189, 0.25);
}

/* ── Logo ── */
.logo {
  font-family: var(--font-logo);
  font-size: 1.35rem;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: color 0.25s;
  flex-shrink: 0;
}

.logo span.accent-red  { color: var(--color-red); }
.logo span.accent-teal { color: var(--color-teal); }

.logo:hover {
  color: var(--color-teal);
}

/* ── Search Bar ── */
.header-search {
  flex: 1;
  max-width: 320px;
  position: relative;
}

.header-search input {
  width: 100%;
  padding: 0.45rem 1rem 0.45rem 2.4rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.25s, background 0.25s;
}

.header-search input::placeholder {
  color: var(--color-text-dim);
}

.header-search input:focus {
  border-color: var(--color-teal);
  background: rgba(18, 224, 189, 0.05);
}

.header-search .search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-dim);
  pointer-events: none;
  font-size: 0.85rem;
}

/* ── Nav ── */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: auto;
}

.site-nav a {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-dim);
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s, background 0.2s;
  position: relative;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 1px;
  background: var(--color-teal);
  transition: transform 0.25s var(--ease-out);
  transform-origin: center;
}

.site-nav a:hover {
  color: var(--color-text);
  background: rgba(18, 224, 189, 0.07);
}

.site-nav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.site-nav a.nav-cta {
  color: var(--color-teal);
  border: 1px solid rgba(18, 224, 189, 0.3);
  margin-left: 0.5rem;
}

.site-nav a.nav-cta:hover {
  background: rgba(18, 224, 189, 0.12);
  border-color: var(--color-teal);
  color: var(--color-teal);
}

/* ── Hamburger ── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile Menu ── */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: rgba(12, 4, 12, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 1.5rem 2rem;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 999;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s var(--ease-out), opacity 0.3s;
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.mobile-menu a {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-dim);
  text-decoration: none;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.2s;
}

.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: var(--color-teal); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .site-nav,
  .header-search {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: flex;
  }
}