/* ===========================================
   Component — Site Header & Navigation
   =========================================== */

/* Page indicator tag (fixed top-left) */
.top-tag {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  background: #fff;
  border: 1px solid var(--color-border);
  border-top: none;
  border-left: none;
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--color-text-soft);
  padding: 4px 10px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.25s ease;
}
.site-header.scrolled {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 110px;
}

.logo img { height: 104px; width: auto; }

/* Nav */
.nav {
  display: flex;
  align-items: center;
  gap: 34px;
}
.nav-list { display: flex; gap: 34px; }

.nav .btn-dark { padding: 10px 24px; }

.nav-link {
  font-size: 16px;
  color: var(--color-text-soft);
  letter-spacing: 1.6px;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-link:hover       { border-color: var(--color-text-soft); }
.nav-link.is-current  { color: var(--color-text); border-color: var(--color-text); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-dark);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .header-inner { padding: 0 24px; }
}

@media (max-width: 860px) {
  .hamburger { display: flex; }

  .nav {
    position: fixed;
    top: 90px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    padding: 28px 24px 32px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  }
  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
  }
  .nav-list      { flex-direction: column; gap: 18px; width: 100%; }
  .header-inner  { height: 70px; }
  .logo img      { height: 60px; }
}