/* ==========================================================================
   4. HEADER LAYOUT STYLES (Isolate Header Shell)
   ========================================================================== */
/* <!--isolated-header-block--> */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1100;
  width: 100%;
  padding: 0;
  background: #ffffff;
  border-bottom: 1px solid #eeeeee;
}

/* Hide the former inline shell while main.js replaces it with the shared header. */
body > header:not(.site-header) {
  display: none;
}

.site-header .header-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 25px clamp(30px, 3vw, 56px) 0;
  display: grid;
  grid-template-columns: clamp(280px, 21.2vw, 400px) minmax(0, 1fr);
  align-items: end;
  gap: clamp(40px, 3.4vw, 64px);
}

.site-header .header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-width: 0;
}

.site-header .logo {
  display: block;
  width: 100%;
}

.site-header .logo img {
  display: block;
  width: 100%;
  height: auto;
}

.site-header .header-nav {
  min-width: 0;
}

.site-header .nav-list {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(24px, 2.5vw, 48px);
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header .nav-item {
  position: relative;
  flex: 0 0 auto;
}

.site-header .nav-item.has-mega {
  position: static;
}

.site-header .nav-trigger,
.site-header .signin-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 0;
  color: rgb(94, 94, 94);
  font-family: Helvetica;
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color 420ms ease, font-weight 420ms ease;
}

.site-header .construction-menu-item > .nav-trigger {
  font-size: 17px;
}

.site-header .nav-trigger:hover,
.site-header .nav-trigger:focus-visible,
.site-header .nav-item.active > .nav-trigger,
.site-header .signin-link:hover,
.site-header .signin-link:focus-visible {
  color: #050505;
  font-weight: 900;
  outline: none;
}

.site-header .signin-link {
  gap: clamp(6px, 0.55vw, 11px);
  font-weight: 400;
  text-transform: lowercase;
  letter-spacing: -0.04em;
}

.site-header .signin-link img {
  width: clamp(25px, 2vw, 39px);
  height: clamp(25px, 2vw, 39px);
  opacity: 0.64;
}

.site-header .mega-menu,
.site-header .dropdown-menu {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity 975ms cubic-bezier(0.22, 1, 0.36, 1), transform 975ms cubic-bezier(0.22, 1, 0.36, 1), visibility 975ms;
}

.site-header .mega-menu {
  position: absolute;
  top: 100%;
  left: 13.2%;
  right: 8.35%;
  z-index: 1000;
  min-height: clamp(320px, 19.4vw, 357px);
  padding: clamp(22px, 2.2vw, 42px) clamp(28px, 2vw, 50px) 34px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(0, 0, 0, 0.04);
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(9px);
  -webkit-backdrop-filter: blur(9px);
}

.site-header .construction-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
}

.site-header .resources-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.65fr 1fr;
  gap: clamp(36px, 7vw, 140px);
}

.site-header .mega-col-title {
  display: flex;
  align-items: center;
  gap: clamp(8px, 0.75vw, 15px);
  width: fit-content;
  margin: 0 0 clamp(17px, 1.7vw, 31px);
  padding: 0;
  color: rgb(94, 94, 94);
  font-family: Helvetica;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.045em;
  text-transform: lowercase;
  white-space: nowrap;
}

.site-header .mega-col-title.text-only {
  font-weight: 600;
}

.site-header .mega-col {
  opacity: 0;
  transform: translateY(-12px);
  transition: opacity 570ms ease, transform 840ms cubic-bezier(0.22, 1, 0.36, 1);
}

.site-header .nav-item:hover .mega-col,
.site-header .nav-item:focus-within .mega-col,
.site-header .nav-item.active .mega-col {
  opacity: 1;
  transform: translateY(0);
}

.site-header .nav-item:hover .mega-col:nth-child(1),
.site-header .nav-item:focus-within .mega-col:nth-child(1),
.site-header .nav-item.active .mega-col:nth-child(1) { transition-delay: 150ms; }
.site-header .nav-item:hover .mega-col:nth-child(2),
.site-header .nav-item:focus-within .mega-col:nth-child(2),
.site-header .nav-item.active .mega-col:nth-child(2) { transition-delay: 270ms; }
.site-header .nav-item:hover .mega-col:nth-child(3),
.site-header .nav-item:focus-within .mega-col:nth-child(3),
.site-header .nav-item.active .mega-col:nth-child(3) { transition-delay: 390ms; }
.site-header .nav-item:hover .mega-col:nth-child(4),
.site-header .nav-item:focus-within .mega-col:nth-child(4),
.site-header .nav-item.active .mega-col:nth-child(4) { transition-delay: 510ms; }

.site-header .mega-col-title:hover,
.site-header .mega-col-title:focus-visible,
.site-header .mega-col li a:hover,
.site-header .mega-col li a:focus-visible,
.site-header .dropdown-menu a:hover,
.site-header .dropdown-menu a:focus-visible {
  color: #050505;
  font-weight: 700;
}

.site-header .mega-col-title img {
  width: 20px;
  height: 20px;
  color: #747474;
  opacity: 0.72;
}

.site-header .mega-col ul {
  margin: 0;
  padding: 0 0 0 clamp(23px, 2.25vw, 55px);
  list-style-type: square;
  color: #707070;
}

.site-header .mega-col li {
  margin: 0 0 clamp(4px, 0.36vw, 8px);
  padding-left: 1px;
}

.site-header .mega-col li::marker {
  font-size: 0.72em;
}

.site-header .mega-col li a {
  display: inline;
  padding: 0;
  color: rgb(94, 94, 94);
  font-family: Helvetica;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.32;
  letter-spacing: 0;
  text-transform: lowercase;
  white-space: normal;
}

.site-header .mega-col li a:hover,
.site-header .mega-col li a:focus-visible {
  color: #050505;
}

.site-header .dropdown-menu {
  position: absolute;
  top: calc(100% + 20px);
  left: 50%;
  z-index: 1000;
  min-width: 270px;
  margin: 0;
  padding: 18px 20px;
  list-style: none;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid #eeeeee;
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.08);
  transform: translate(-50%, -6px);
}

.site-header .dropdown-menu::before {
  content: '';
  position: absolute;
  right: 0;
  bottom: 100%;
  left: 0;
  height: 22px;
}

.site-header .dropdown-menu li + li {
  margin-top: 5px;
}

.site-header .dropdown-menu a {
  display: block;
  padding: 8px 7px;
  color: rgb(94, 94, 94);
  font-family: Helvetica;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-transform: lowercase;
  white-space: nowrap;
}

.site-header .dropdown-menu a:hover,
.site-header .dropdown-menu a:focus-visible {
  color: #000000;
  background: #f5f5f5;
}

.site-header .topic-navigation-link {
  margin-bottom: 9px;
  border: 1px solid #777777;
  text-align: center;
}

.site-header .nav-item:hover > .mega-menu,
.site-header .nav-item:focus-within > .mega-menu,
.site-header .nav-item.active > .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.site-header .nav-item:hover > .dropdown-menu,
.site-header .nav-item:focus-within > .dropdown-menu,
.site-header .nav-item.active > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.site-header .nav-toggle {
  display: none;
}

/* Desktop calibration: matches reference/header.png at its 1844px canvas. */
@media (min-width: 1500px) {
  .site-header .header-container {
    padding: 27px clamp(60px, 4.07vw, 75px) 11px clamp(30px, 2.06vw, 38px);
    grid-template-columns: clamp(338px, 22.56vw, 416px) minmax(0, 1fr);
    gap: clamp(32px, 1.95vw, 36px);
  }

  .site-header .nav-trigger,
  .site-header .signin-link {
    font-size: clamp(16px, 1.085vw, 20px);
  }

  .site-header .construction-menu-item > .nav-trigger {
    font-size: 17px;
  }

  .site-header .mega-menu {
    left: 13.18%;
    right: 8.46%;
    min-height: 356px;
    padding: 42px 37px 34px;
  }

  .site-header .mega-col-title {
    margin-bottom: 31px;
    color: #050505;
    font-size: 15px;
    font-weight: 400;
  }

  .site-header .mega-col-title img {
    width: 20px;
    height: 20px;
  }

  .site-header .mega-col ul {
    padding-left: 41px;
  }

  .site-header .mega-col li a {
    font-size: 15px;
    font-weight: 400;
  }
}

.site-banner,
.banner,
.banner-block {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 260px;
  overflow: hidden;
  background: #101515;
}

.site-banner img,
.banner img,
.banner-block img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

@media (max-width: 1023px) {
  .site-header {
    padding: 0;
  }

  .site-header .header-container {
    display: block;
    padding: 14px 20px;
  }

  .site-header .header-top {
    width: 100%;
  }

  .site-header .logo {
    width: min(68vw, 275px);
  }

  .site-header .nav-toggle {
    display: block;
    padding: 10px 0 10px 20px;
    border: 0;
    background: transparent;
    color: #050505;
    font-family: Helvetica;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    cursor: pointer;
  }

  .site-header .nav-list {
    display: block;
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    z-index: 1000;
    max-height: 0;
    overflow-y: auto;
    padding: 0 20px;
    background: #ffffff;
    border-top: 1px solid #eeeeee;
    box-shadow: 0 18px 28px rgba(0, 0, 0, 0.08);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: max-height 650ms cubic-bezier(0.22, 1, 0.36, 1), padding 650ms cubic-bezier(0.22, 1, 0.36, 1), opacity 420ms ease, visibility 650ms;
  }

  .site-header .nav-list.mobile-open {
    max-height: calc(100dvh - 82px);
    padding: 10px 20px 28px;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-header .nav-item {
    width: 100%;
    border-bottom: 1px solid #ededed;
  }

  .site-header .nav-trigger,
  .site-header .signin-link {
    width: 100%;
    min-height: 48px;
    justify-content: space-between;
    font-size: 14px;
    letter-spacing: -0.02em;
  }

  .site-header .construction-menu-item > .nav-trigger {
    font-size: 14px;
  }

  .site-banner,
  .banner,
  .banner-block {
    height: 180px;
  }

  .site-header .has-dropdown > .nav-trigger::after,
  .site-header .has-mega > .nav-trigger::after {
    content: '+';
    margin-left: 16px;
    color: #777777;
    font-size: 18px;
    font-weight: 400;
  }

  .site-header .nav-item.active > .nav-trigger::after {
    content: '−';
  }

  .site-header .mega-menu,
  .site-header .dropdown-menu,
  .site-header .nav-item:hover > .mega-menu,
  .site-header .nav-item:focus-within > .mega-menu,
  .site-header .nav-item:hover > .dropdown-menu,
  .site-header .nav-item:focus-within > .dropdown-menu {
    position: static;
    width: 100%;
    min-width: 0;
    min-height: 0;
    max-height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
    border: 0;
    box-shadow: none;
    background: #ffffff;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: none;
    transition: max-height 1050ms cubic-bezier(0.22, 1, 0.36, 1), padding 1050ms cubic-bezier(0.22, 1, 0.36, 1), opacity 690ms ease, visibility 1050ms;
  }

  .site-header .nav-item.active > .mega-menu,
  .site-header .nav-item.active > .dropdown-menu {
    max-height: 1800px;
    padding: 4px 0 22px;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .site-header .mega-col {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 540ms ease, transform 780ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .site-header .nav-item.active .mega-col {
    opacity: 1;
    transform: translateY(0);
  }

  .site-header .nav-item.active .mega-col:nth-child(1) { transition-delay: 150ms; }
  .site-header .nav-item.active .mega-col:nth-child(2) { transition-delay: 270ms; }
  .site-header .nav-item.active .mega-col:nth-child(3) { transition-delay: 390ms; }
  .site-header .nav-item.active .mega-col:nth-child(4) { transition-delay: 510ms; }

  .site-header .construction-grid,
  .site-header .resources-grid {
    display: block;
  }

  .site-header .mega-col + .mega-col {
    margin-top: 25px;
  }

  .site-header .mega-col-title {
    margin-bottom: 11px;
    font-size: 15px;
  }

  .site-header .mega-col-title img {
    width: 20px;
    height: 20px;
  }

  .site-header .mega-col ul {
    padding-left: 35px;
  }

  .site-header .mega-col li a,
  .site-header .dropdown-menu a {
    font-size: 15px;
    line-height: 1.5;
  }

  .site-header .dropdown-menu::before {
    display: none;
  }

  .site-header .signin-link {
    justify-content: flex-start;
    gap: 10px;
  }

}

@media (min-width: 1024px) and (max-width: 1180px) {
  .site-banner,
  .banner,
  .banner-block {
    height: 180px;
  }
}

@media (max-width: 600px) {
  .site-banner,
  .banner,
  .banner-block {
    height: 130px;
  }
}


.banner-block {
  width: 100%;
  margin-top: 0;
  margin-bottom: 0;
}

.banner-img-container {
  width: 100%;
  height: 100%;
  /* height: some-fixed-height; if you want a fixed height */
  overflow: hidden;
}

.banner-img-container img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center top;
}

.header-utc-date {
  position: fixed;
  top: 10px;
  right: 15px;
  z-index: 1200;
  color: #888888;
  font-family: "Courier New", Courier, monospace;
  font-size: 9px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.05em;
  pointer-events: none;
  white-space: nowrap;
}