/* Header Styles for 中田税理士事務所 */

/* Header Container */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  z-index: var(--z-index-sticky);
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

/* Header Inner */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  text-decoration: none;
  color: var(--color-primary);
}

.logo:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.logo-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  color: var(--color-white);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  color: var(--color-primary);
}

.logo-subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  line-height: 1.2;
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-gray-50);
  text-decoration: none;
}

.nav-link.active {
  color: var(--color-primary);
  background-color: rgba(26, 54, 93, 0.08);
}

/* Header CTA Button */
.header-cta {
  margin-left: var(--spacing-4);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: var(--spacing-2);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-gray-700);
}

.mobile-menu-toggle:hover {
  color: var(--color-primary);
}

.hamburger {
  display: block;
  position: relative;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  transition: all var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  transition: all var(--transition-fast);
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  bottom: -7px;
}

/* Hamburger Animation */
.mobile-menu-toggle.active .hamburger {
  background-color: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.mobile-menu-toggle.active .hamburger::after {
  bottom: 0;
  transform: rotate(-45deg);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  padding: var(--spacing-6);
  overflow-y: auto;
  z-index: var(--z-index-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--color-gray-100);
}

.mobile-nav-link {
  display: block;
  padding: var(--spacing-4) 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.mobile-nav-link.active {
  color: var(--color-primary);
}

.mobile-nav-cta {
  margin-top: var(--spacing-6);
}

.mobile-nav-cta .btn {
  width: 100%;
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .nav-list {
    gap: 0;
  }
  
  .nav-link {
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
  }
  
  .header-cta {
    margin-left: var(--spacing-2);
  }
}

@media (max-width: 768px) {
  .header {
    height: var(--header-height-mobile);
  }
  
  .nav {
    display: none;
  }
  
  .header-cta {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .mobile-nav {
    display: block;
  }
  
  .logo-title {
    font-size: var(--font-size-base);
  }
  
  .logo-subtitle {
    display: none;
  }
  
  .logo-icon {
    width: 40px;
    height: 40px;
    font-size: var(--font-size-lg);
  }
}

@media (max-width: 480px) {
  .logo-text {
    display: none;
  }
  
  .logo-icon {
    width: 44px;
    height: 44px;
  }
}

/* Header with transparent background (for hero sections) */
.header-transparent {
  background-color: transparent;
  box-shadow: none;
}

.header-transparent .logo,
.header-transparent .nav-link {
  color: var(--color-white);
}

.header-transparent .nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.header-transparent .mobile-menu-toggle {
  color: var(--color-white);
}

.header-transparent.scrolled {
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.header-transparent.scrolled .logo,
.header-transparent.scrolled .nav-link,
.header-transparent.scrolled .mobile-menu-toggle {
  color: var(--color-gray-700);
}

.header-transparent.scrolled .nav-link:hover {
  background-color: var(--color-gray-50);
}