/* ==========================================================
   DaheDigital — header.css
   BEM methodology | prefix: tfsp9-
   ========================================================== */

/* header */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-header);
  background: var(--clr-bg);
  border-bottom: 1px solid var(--clr-border);
  height: var(--header-h);
  overflow: hidden;
}

.nav-inner {
  display: flex;
  align-items: center;
  height: var(--header-h);
  gap: var(--sp-md);
  overflow: hidden;
}

/* logo */
.tfsp9-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}
.tfsp9-logo img {
  max-width: var(--logo-w);
  max-height: var(--logo-h);
  width: auto;
  height: auto;
  display: block;
}

/* nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
  margin-left: auto;
}
.nav-links a {
  font-family: var(--ff-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: color var(--tr-fast);
  text-transform: uppercase;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-accent);
}

/* hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--sp-xs);
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--tr-fast), opacity var(--tr-fast);
}

/* responsive header */
@media (min-width: 1025px) {
  .nav-links { display: flex; }
  .hamburger { display: none; }
}
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
}

/* mobile menu — placed after </header> in DOM */
.mobile-menu {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0; bottom: 0;
  z-index: var(--z-mobile);
  background: var(--clr-bg);
  border-top: 1px solid var(--clr-border);
  padding: var(--sp-xl) var(--sp-lg);
  gap: var(--sp-md);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s linear 0.2s;
}
.mobile-menu.open {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s linear 0s;
}
.mobile-menu a {
  font-family: var(--ff-body);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--clr-text);
  text-decoration: none;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: var(--sp-sm) 0;
  border-bottom: 1px solid var(--clr-border);
  transition: color var(--tr-fast);
}
.mobile-menu a:hover {
  color: var(--clr-accent);
}