/* Japan Stock Alpha — shared site header.
   Self-contained: all rules are scoped under .site-header so they win over
   any generic header/.header-inner/.nav-link rules in styles.css and never
   leak into article bodies. Colours are literal (no dependency on page vars). */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid #e6e8ec;
  box-shadow: 0 1px 0 rgba(17, 24, 39, 0.02);
}
.site-header .header-inner {
  width: min(1440px, calc(100% - 96px));
  max-width: none;
  height: auto;
  min-height: 78px;
  margin: 0 auto;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.site-header .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: Fraunces, Georgia, serif;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  white-space: nowrap;
  color: #111827;
}
.site-header .brand img { width: 28px; height: 28px; object-fit: cover; border-radius: 6px; }

.site-header .nav-toggle {
  display: none;
  align-items: center;
  gap: 7px;
  border: 1px solid #e6e8ec;
  background: #fff;
  border-radius: 10px;
  padding: 9px 11px;
  font: inherit;
  color: #111827;
  font-weight: 650;
  cursor: pointer;
}
.site-header .menu-icon { font-size: 16px; line-height: 1; }

.site-header .site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px;
  border: 1px solid #e6e8ec;
  border-radius: 14px;
  background: #f7f9fc;
}
.site-header .nav-link,
.site-header .dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 42px;
  padding: 0 15px;
  border: 0;
  background: transparent;
  color: #344054;
  font: inherit;
  font-size: 14px;
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
  border-radius: 9px;
  cursor: pointer;
}
.site-header .nav-link:hover,
.site-header .dropdown-trigger:hover,
.site-header .nav-link:focus-visible,
.site-header .dropdown-trigger:focus-visible {
  background: #fff;
  color: #111827;
  box-shadow: 0 1px 3px rgba(17, 24, 39, 0.08);
  outline: none;
}
.site-header .nav-link.active,
.site-header .dropdown-trigger.active {
  background: #fff;
  color: #2563eb;
  box-shadow: 0 1px 3px rgba(17, 24, 39, 0.08);
}
.site-header .nav-portfolio {
  border: 1px solid #d6e4ff;
  background: #fff;
  color: #1d4ed8;
}
.site-header .nav-portfolio:hover,
.site-header .nav-portfolio:focus-visible {
  border-color: #b8d0ff;
  color: #1d4ed8;
}

.site-header .dropdown { position: relative; }
.site-header .dropdown-trigger .chevron {
  margin-left: 2px;
  font-size: 11px;
  color: #667085;
  transition: transform 160ms ease;
}
.site-header .dropdown.is-open .chevron,
.site-header .dropdown:hover .chevron,
.site-header .dropdown:focus-within .chevron { transform: rotate(180deg); }

.site-header .dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  min-width: 360px;
  padding: 10px;
  background: #fff;
  border: 1px solid #e6e8ec;
  border-radius: 16px;
  box-shadow: 0 14px 40px rgba(17, 24, 39, 0.08);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, -6px);
  transition: 160ms ease;
}
.site-header .dropdown:hover .dropdown-menu,
.site-header .dropdown:focus-within .dropdown-menu,
.site-header .dropdown.is-open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}
.site-header .dropdown-kicker {
  margin: 4px 8px 8px;
  color: #667085;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.site-header .dropdown-menu a.dropdown-item {
  display: block;
  padding: 12px 14px;
  border: 1px solid transparent;
  border-radius: 11px;
  text-decoration: none;
}
.site-header .dropdown-menu a.dropdown-item + a.dropdown-item { margin-top: 4px; }
.site-header .dropdown-menu a.dropdown-item:hover,
.site-header .dropdown-menu a.dropdown-item:focus-visible {
  border-color: #dbe7ff;
  background: #eff6ff;
  color: #111827;
  outline: none;
}
.site-header .dropdown-menu a.dropdown-item.active {
  border-color: #c7d8ff;
  background: #eff6ff;
  color: #111827;
}
.site-header .dropdown-title { display: block; color: #111827; font-size: 14px; font-weight: 700; }
.site-header .dropdown-desc {
  display: block;
  margin-top: 2px;
  color: #667085;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.45;
}

@media (max-width: 900px) {
  .site-header .brand { font-size: 18px; }
}

/* Desktop: four equal-width cells separated by thin vertical dividers */
@media (min-width: 961px) {
  .site-header .site-nav {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    width: 660px;
    gap: 0;
    padding: 0;
    border: 1px solid #d7dce3;
    border-radius: 11px;
    background: #fff;
  }
  .site-header .site-nav > .nav-link,
  .site-header .site-nav > .dropdown {
    min-width: 0;
    border-left: 1px solid #d7dce3;
  }
  .site-header .site-nav > .nav-link:first-child { border-left: 0; }
  .site-header .site-nav > .dropdown { display: flex; align-items: stretch; }
  .site-header .site-nav > .nav-link,
  .site-header .site-nav > .dropdown > .dropdown-trigger {
    width: 100%;
    min-height: 48px;
    justify-content: center;
    padding: 0 14px;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    text-align: center;
    white-space: nowrap;
  }
  .site-header .site-nav > .nav-link:first-child { border-radius: 10px 0 0 10px; }
  .site-header .site-nav > .nav-link:last-child { border-radius: 0 10px 10px 0; }
  .site-header .site-nav > .nav-link:hover,
  .site-header .site-nav > .dropdown > .dropdown-trigger:hover,
  .site-header .site-nav > .nav-link:focus-visible,
  .site-header .site-nav > .dropdown > .dropdown-trigger:focus-visible,
  .site-header .site-nav > .nav-link.active,
  .site-header .site-nav > .dropdown > .dropdown-trigger.active {
    background: #f6f8fb;
    box-shadow: none;
  }
  .site-header .nav-portfolio {
    border: 0;
    background: transparent;
    color: #344054;
  }
  .site-header .nav-portfolio:hover,
  .site-header .nav-portfolio:focus-visible { border-color: transparent; color: #111827; }
  .site-header .site-nav > .nav-portfolio.active { color: #2563eb; }
}

/* Tablet / mobile: stacked menu behind the toggle */
@media (max-width: 960px) {
  .site-header .nav-toggle { display: inline-flex; }
  .site-header .site-nav {
    position: absolute;
    top: 78px;
    left: 48px;
    right: 48px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: auto;
    padding: 10px;
    border: 1px solid #e6e8ec;
    border-radius: 14px;
    background: #fff;
    box-shadow: 0 14px 40px rgba(17, 24, 39, 0.08);
  }
  .site-header .site-nav.is-open { display: flex; }
  .site-header .site-nav > .nav-link,
  .site-header .site-nav > .dropdown {
    border-left: 0;
    border-top: 1px solid #e6e8ec;
  }
  .site-header .site-nav > .nav-link:first-child { border-top: 0; }
  .site-header .site-nav > .nav-link,
  .site-header .site-nav > .dropdown > .dropdown-trigger {
    width: 100%;
    min-height: 46px;
    justify-content: space-between;
    padding: 0 13px;
    border-radius: 8px;
  }
  .site-header .nav-portfolio {
    border: 0;
    background: transparent;
    color: #344054;
  }
  .site-header .dropdown-menu {
    position: static;
    display: none;
    min-width: 0;
    margin: 4px 0 8px;
    padding: 6px;
    border-radius: 12px;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none !important;
  }
  .site-header .dropdown.is-open .dropdown-menu { display: block; }
  .site-header .dropdown:hover .dropdown-menu:not(:focus-within) { display: none; }
  .site-header .dropdown.is-open:hover .dropdown-menu { display: block; }
}

@media (max-width: 760px) {
  .site-header .header-inner { width: min(100% - 40px, 1440px); min-height: 68px; }
  .site-header .site-nav { top: 68px; left: 20px; right: 20px; }
}