/* =========================================================
   EMIFORMULA — HEADER & LOGO SYSTEM
   STEP 1.3 — COMPLETE
   ========================================================= */

.site-header {
  position: relative;
  z-index: 1000;
  width: 100%;
  background: var(--background);
  border-bottom: 1px solid var(--border);
}

.header-container {
  width: min(
    calc(100% - 2rem),
    var(--container-max)
  );
  min-height: 68px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex: 0 0 auto;
  color: var(--text-primary);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.site-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background: var(--brand-primary);
  color: var(--text-on-brand);
  font-size: 1rem;
  font-weight: 800;
}

.site-logo-text {
  font-size: 1.08rem;
  white-space: nowrap;
}

.desktop-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-left: auto;
}

.nav-link,
.nav-button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.55rem 0.75rem;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
}

.nav-link:hover,
.nav-button:hover,
.nav-link-active {
  background: var(--surface);
  color: var(--text-primary);
}

.nav-chevron {
  font-size: 0.9em;
  line-height: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-icon-button,
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--background);
  color: var(--text-primary);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

.header-icon-button:hover,
.menu-toggle:hover {
  background: var(--surface);
  border-color: var(--border-strong);
}

.header-icon-button {
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition:
    transform var(--transition-fast);
}

.header-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--background);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

.header-panel-inner {
  width: min(
    calc(100% - 2rem),
    var(--container-max)
  );
  margin-inline: auto;
  padding: var(--space-6) 0;
}

.header-panel-inner strong {
  display: block;
  margin-bottom: var(--space-2);
}

.header-panel-inner p {
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.mobile-navigation {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--background);
}

.mobile-navigation[hidden] {
  display: none !important;
}

.mobile-navigation nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding:
    var(--space-3)
    0
    var(--space-4);
}

.mobile-nav-link,
.mobile-nav-button {
  width: 100%;
  min-height: 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0.75rem;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-primary);
  text-align: left;
  font-weight: 600;
  cursor: pointer;
}

.mobile-nav-link:hover,
.mobile-nav-button:hover {
  background: var(--surface);
}

@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .mobile-navigation {
    display: block;
  }

  .header-container {
    min-height: 64px;
  }
}

@media (max-width: 480px) {
  .header-container {
    width: min(
      calc(100% - 1rem),
      var(--container-max)
    );
  }

  .site-logo-text {
    font-size: 1rem;
  }

  .site-logo-mark {
    width: 32px;
    height: 32px;
  }

  .header-icon-button,
  .menu-toggle {
    min-width: 40px;
    min-height: 40px;
  }
}

/* ---------- Category navigation ---------- */
.header-category-panel {
  display: grid;
  grid-template-columns: 1.15fr repeat(3, minmax(150px, 1fr));
  gap: .9rem;
  align-items: stretch;
}

.header-panel-intro {
  padding: .55rem .25rem;
}

.header-panel-intro strong {
  font-size: 1rem;
}

.header-category-link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 92px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}

.header-category-link:hover {
  transform: translateY(-2px);
  border-color: var(--brand-primary);
  background: var(--brand-primary-light);
}

.header-category-link b {
  margin-bottom: .25rem;
  color: var(--text-primary);
}

.header-category-link span {
  color: var(--text-secondary);
  font-size: .78rem;
}

.mobile-submenu {
  display: none;
  margin: -.15rem 0 .35rem;
  padding: .35rem 0 .35rem 1rem;
  border-left: 2px solid var(--border);
}

.mobile-nav-button[aria-expanded="true"] + .mobile-submenu {
  display: grid;
  gap: .35rem;
}

.mobile-submenu a {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  padding: .65rem .75rem;
  border-radius: 10px;
  background: var(--surface);
}

.mobile-submenu a:hover {
  background: var(--surface-hover);
}

.mobile-submenu strong {
  font-size: .88rem;
}

.mobile-submenu span {
  color: var(--text-secondary);
  font-size: .76rem;
}

@media (max-width: 900px) {
  .header-category-panel {
    grid-template-columns: 1fr;
  }
}