/* ============================================================
   Blue Academy — Layout (Header, Footer, Site Structure)
   ============================================================ */

/* ============ Site Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 32px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.02em;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.site-logo:hover {
  opacity: 0.7;
  color: var(--ink);
}

.site-logo svg {
  width: 32px;
  height: 32px;
  color: var(--blue);
}

.site-logo-text {
  font-family: var(--font-jp);
}

/* ============ Primary Navigation ============ */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.primary-nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.primary-nav-list a {
  display: inline-block;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
  border-radius: 4px;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.primary-nav-list a:hover {
  background: var(--soft-bg);
  color: var(--blue);
}

.primary-nav-list .current-menu-item a,
.primary-nav-list .current_page_item a {
  color: var(--blue);
}

.primary-nav-cta {
  margin-left: 16px;
}

/* ============ Mobile Menu Toggle ============ */
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}

.menu-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
}

.menu-toggle-bar::before,
.menu-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
}

.menu-toggle-bar::before { top: -6px; }
.menu-toggle-bar::after { top: 6px; }

/* ============ Site Footer ============ */
.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.7);
  padding: 80px 0 32px;
}

.site-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}

.site-footer-col-title {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--white);
  text-transform: uppercase;
  margin-bottom: 24px;
}

.site-footer-brand {
  font-size: 22px;
  font-weight: 900;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.site-footer-tagline {
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.6);
}

.site-footer-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.site-footer-list a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  transition: color var(--transition-fast);
}

.site-footer-list a:hover {
  color: var(--white);
}

.site-footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.05em;
}

.site-footer-copy {
  font-family: var(--font-en);
}

.site-footer-cta {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer-cta .btn {
  width: 100%;
  padding: 12px 16px;
  font-size: 13px;
  justify-content: center;
}

.site-footer-cta .btn-primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}

.site-footer-cta .btn-line {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.25);
}

.site-footer-cta .btn-line:hover {
  border-color: var(--white);
  color: var(--white);
}

.site-footer-meta {
  display: flex;
  gap: 20px;
}

.site-footer-meta a {
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
}

.site-footer-meta a:hover {
  color: var(--white);
}

/* ============ Main Content ============ */
.site-main {
  min-height: 50vh;
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .menu-toggle {
    display: flex;
  }

  .primary-nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 0;
  }

  .primary-nav-list.is-open {
    display: flex;
  }

  .primary-nav-list a {
    padding: 14px 0;
    font-size: 16px;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }

  .primary-nav-list li:last-child a {
    border-bottom: none;
  }

  .primary-nav-cta {
    margin-left: 0;
  }

  .site-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .site-footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .site-header-inner {
    padding: 14px 0;
  }

  .site-logo {
    font-size: 18px;
  }

  .site-footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ============================================================
   Site Logo Image (blueacademy-logo.svg)
   ============================================================ */
.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0;
}
.site-logo-img {
  display: block;
  height: 28px;
  width: auto;
  max-width: 100%;
}
/* フッターは暗背景なので、SVG を全白化して視認性を確保 */
.site-footer .site-logo-img {
  height: 28px;
  filter: brightness(0) invert(1);
}
@media (max-width: 640px) {
  .site-logo-img { height: 22px; }
}