/* ============================================================
   RANKAYA — Header & Navigation
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  transition: background var(--transition), backdrop-filter var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-4);
}

/* ── Logo ── */
.site-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}
.site-logo svg {
  height: 32px;
  width: auto;
}

/* ── Nav ── */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.site-nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--color-white);
}

/* ── Header CTA ── */
.header-cta {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.btn-whatsapp {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background: #25D366;
  color: #fff;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-whatsapp:hover {
  background: #1ebe5d;
  box-shadow: 0 4px 20px rgba(37,211,102,0.35);
  transform: translateY(-1px);
}
.btn-whatsapp svg { flex-shrink: 0; }

/* ── Hamburger ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1100;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
  transform-origin: center;
}
.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Drawer ── */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: rgba(10, 10, 10, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) var(--container-padding);
  flex-direction: column;
  gap: var(--space-1);
  transform: translateY(-10px);
  opacity: 0;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 999;
}
.mobile-nav.open {
  transform: translateY(0);
  opacity: 1;
}
.mobile-nav a {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition);
  text-decoration: none;
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: var(--color-white); }
.mobile-nav .btn-whatsapp {
  margin-top: var(--space-2);
  justify-content: center;
}

/* ── Responsive ── */
@media (max-width: 767px) {
  .site-nav,
  .header-cta {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .mobile-nav {
    display: flex;
  }
}

@media (max-width: 1024px) and (min-width: 768px) {
  .site-nav a {
    padding: 0.5rem 0.5rem;
    font-size: 0.8rem;
  }
}