/* Shared Sum-IT site header. Requires /css/tokens.css.
   Default: solid navy bar. On pages whose first section is a dark hero,
   add class "has-dark-hero" to <body>: the bar starts transparent over the
   hero and turns solid once the page scrolls. */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  color: var(--c-on-dark);
  font-family: var(--font-sans);
  background: var(--c-navy-900);
  border-bottom: 1px solid var(--c-line-dark);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

/* Dark-hero pages: the hero slides under the transparent bar. The hero must
   add var(--header-h) of top padding (see css/index.css / page CSS). */
.has-dark-hero .site-header {
  margin-bottom: calc(-1 * var(--header-h));
  background: transparent;
  border-bottom-color: transparent;
}

.site-header.is-scrolled,
.has-dark-hero .site-header.is-scrolled,
.has-dark-hero .site-header.menu-open {
  background: rgba(22, 25, 70, .94);
  border-bottom-color: var(--c-line-dark);
  box-shadow: 0 8px 24px rgba(8, 10, 40, .22);
}

@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .site-header.is-scrolled {
    -webkit-backdrop-filter: saturate(160%) blur(12px);
    backdrop-filter: saturate(160%) blur(12px);
  }
}

.site-header .header-wrap {
  position: relative;
  max-width: var(--container);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site-header .nav {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  height: 100%;
  margin: 0;
  padding: 0;
  background: none;
  border: 0;
  box-shadow: none;
}

/* Logo */
.site-header .logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  flex-shrink: 0;
  color: var(--c-on-dark);
  font-size: 1.1875rem;
  font-weight: 800;
  letter-spacing: -.01em;
  text-decoration: none;
  white-space: nowrap;
}

.site-header .mark {
  display: inline-flex;
  width: 32px;
  height: 32px;
}

.site-header .mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Desktop menu */
.site-header .menu {
  display: flex;
  flex: 1;
  justify-content: center;
  gap: var(--sp-1);
  min-width: 0;
}

.site-header .menu a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 var(--sp-3);
  border-radius: var(--radius-sm);
  color: var(--c-on-dark-muted);
  font-size: var(--fs-nav);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}

.site-header .menu a:hover {
  color: var(--c-on-dark);
  background: rgba(255, 255, 255, .07);
}

.site-header .menu a.active {
  color: var(--c-on-dark);
}

.site-header .menu a.active::after {
  content: "";
  position: absolute;
  left: var(--sp-3);
  right: var(--sp-3);
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-green);
}

/* Right-hand actions */
.site-header .right {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
  margin-left: auto;
}

.site-header .langs {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 3px;
  border: 1px solid var(--c-line-dark);
  border-radius: var(--radius-pill);
}

.site-header .langs[hidden] {
  display: none;
}

.site-header .langs button {
  min-width: 36px;
  min-height: 30px;
  margin: 0;
  padding: 0 var(--sp-2);
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--c-on-dark-muted);
  font: 700 .75rem/1 var(--font-sans);
  letter-spacing: .04em;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}

.site-header .langs button:hover {
  color: var(--c-on-dark);
}

.site-header .langs button.on {
  background: var(--c-on-dark);
  color: var(--c-navy-900);
}

.site-header .navlogin {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 var(--sp-2);
  color: var(--c-on-dark-muted);
  font-size: var(--fs-nav);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.site-header .navlogin:hover {
  color: var(--c-on-dark);
}

.site-header .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-h-sm);
  margin: 0;
  padding: 0 var(--sp-4);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: var(--c-green);
  color: var(--c-on-green);
  font: 700 var(--fs-small)/1.2 var(--font-sans);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: none;
  transform: none;
  transition: background-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.site-header .btn:hover {
  background: #1fd394;
  color: var(--c-on-green);
  box-shadow: var(--shadow-green);
}

.site-header .btn:active {
  background: var(--c-green-600);
}

.site-header .btn.ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, .28);
  color: var(--c-on-dark);
}

.site-header .btn.ghost:hover {
  background: rgba(255, 255, 255, .08);
  box-shadow: none;
}

.site-header a:focus-visible,
.site-header button:focus-visible {
  outline: 3px solid var(--c-green-300);
  outline-offset: 2px;
}

/* Burger */
.site-header .burger {
  display: none;
  flex: 0 0 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--c-line-dark);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .06);
  cursor: pointer;
}

.site-header .burger span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-on-dark);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.site-header .burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header .burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.site-header .burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile drawer (drops below the bar) */
.site-header .mobmenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-height: calc(100vh - var(--header-h));
  max-height: calc(100dvh - var(--header-h));
  overflow-y: auto;
  padding: var(--sp-3) var(--gutter) var(--sp-5);
  background: var(--c-navy-900);
  border-top: 1px solid var(--c-line-dark);
  border-bottom: 1px solid var(--c-line-dark);
  box-shadow: 0 24px 48px rgba(8, 10, 40, .35);
}

.site-header .mobmenu::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;

    background: inherit;
    backdrop-filter: blur(1.5rem);
    -webkit-backdrop-filter: blur(1.5rem);
}
.site-header .mobmenu.open {
  display: block;
  animation: site-header-drop var(--dur) var(--ease);
}

.site-header .mobmenu nav {
  display: grid;
  gap: 2px;
}

.site-header .mobmenu nav a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 var(--sp-3);
  border-radius: var(--radius-md);
  color: var(--c-on-dark);
  font-size: 1.0625rem;
  font-weight: 600;
  text-decoration: none;
}

.site-header .mobmenu nav a:hover,
.site-header .mobmenu nav a.active {
  background: rgba(255, 255, 255, .08);
}

.site-header .mobmenu nav a.active {
  box-shadow: inset 3px 0 0 var(--c-green);
}

.site-header .mobmenu-actions {
  display: grid;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--c-line-dark);
}

.site-header .mobmenu-actions .btn {
  min-height: var(--control-h);
  font-size: var(--fs-button);
}

@keyframes site-header-drop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* Breakpoints */
@media (max-width: 1180px) {
  .site-header .menu a { padding: 0 var(--sp-2); }
}

@media (max-width: 1080px) {
  .site-header .menu { display: none; }
  .site-header .burger { display: inline-flex; }
}

@media (max-width: 640px) {
  .site-header .nav { gap: var(--sp-3); }
  .site-header .right { gap: var(--sp-2); }
  .site-header .right > .btn,
  .site-header .navlogin { display: none; }
}

@media (max-width: 359px) {
  .site-header .logo-text { display: none; }
}

/* v2: 6-item menu fits; tighten a little on small laptops */
@media (max-width: 1300px) { .site-header .menu a { padding: 0 var(--sp-2); } }