/* 🏗️ Sapporo Travel Support - Header Styles */

/* === 📐 Header Specific Variables === */
:root {
  /* 🎯 Header specific variables */
  --header-height: 70px;
  --header-height-mobile: 55px;
  --header-height-compact: 50px;
  --header-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  --header-backdrop: blur(12px);
}

/* === 🏗️ Header Base Structure === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: var(--header-backdrop);
  -webkit-backdrop-filter: var(--header-backdrop);
  box-shadow: var(--header-shadow);
  z-index: 1300;
  transition: all 0.3s ease;
  border-bottom: 1px solid var(--border-light);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}

/* === 📦 Container & Layout === */
.site-header .container {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: 0.85rem;
  padding-block: 0;
}

.header-content {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.75rem;
  min-height: var(--header-height-mobile);
  box-sizing: border-box;
}

/* === 🖼️ Logo Container === */
.logo-container {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex: 1 1 auto;
  min-width: 0;
  transition: all 0.3s ease;
  cursor: pointer;
}

.logo-container:hover {
  transform: translateY(-1px);
}

.logo-container:hover .logo-img img {
  transform: scale(1.05);
}

.logo-container:hover .logo h1 a {
  color: #1e4080;
}

/* === 🖼️ Logo Image Section === */
.logo-img {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img img {
  height: 30px;
  width: auto;
  object-fit: contain;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.1));
}

/* === 🎨 Logo Text Section === */
.logo {
  min-width: 0;
}

.logo h1 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.logo h1 a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background: linear-gradient(135deg, var(--primary-blue) 0%, #1e4080 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
  line-height: 1.1;
}

/* === 🧭 Main Navigation === */
.main-navigation {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  margin-left: auto;
  min-width: 0;
  width: 100%;
  position: fixed;
  /* Explicit positioning for inset fallback */
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  min-height: 100vh; /* Ensure full viewport coverage */
  padding: 5.5rem 1.25rem 3rem;
  background: rgba(17, 34, 56, 0.94);
  color: #ffffff;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  gap: 1.75rem;
  box-shadow: 0 24px 60px rgba(14, 33, 58, 0.22);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-8%);
  z-index: 1400;
  overflow-y: auto; /* Allow scrolling for long menus */
  -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dynamic viewport height support for modern browsers (mobile only) */
@media (max-width: 959px) {
  @supports (height: 100dvh) {
    .main-navigation {
      min-height: 100dvh;
    }
  }
}

.main-navigation ul {
  display: flex;
  flex-direction: column;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 1.25rem;
  align-items: stretch;
  width: 100%;
}

.main-navigation li {
  position: relative;
  width: 100%;
}

.main-navigation a {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  text-decoration: none;
  color: #ffffff;
  font-weight: 600;
  font-size: 1.05rem;
  padding: 0.9rem 1.4rem;
  margin: 0;
  border-radius: 14px;
  transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  white-space: nowrap;
  min-height: 52px;
  box-sizing: border-box;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.08);
}

.main-navigation a:hover {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

.main-navigation a.active,
.main-navigation .current-menu-item > a,
.main-navigation .current_page_item > a,
.main-navigation .current-menu-ancestor > a {
  background: var(--primary-blue);
  color: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(44, 90, 160, 0.35);
}

.main-navigation a.active::after,
.main-navigation .current-menu-item > a::after,
.main-navigation .current_page_item > a::after,
.main-navigation .current-menu-ancestor > a::after {
  display: none;
}

.main-navigation.mobile-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

@keyframes slideIn {
  from {
    width: 0;
    opacity: 0;
  }
  to {
    width: 24px;
    opacity: 1;
  }
}

/* === 🎛️ Header Controls === */
.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.language-switcher-container {
  display: flex;
  align-items: center;
}

/* === 🍔 Mobile Menu Toggle === */

.mobile-menu-toggle {
  display: flex;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.6rem;
  color: var(--text-dark);
  font-size: 1.5rem;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  transition: background-color 0.3s ease, color 0.3s ease;
  flex-shrink: 0;
  margin-left: 0.5rem;
}

.mobile-menu-toggle:hover {
  background-color: var(--soft-gray);
}

.mobile-menu-toggle:focus-visible {
  outline: 3px solid var(--primary-blue);
  outline-offset: 3px;
}

.mobile-menu-toggle.active {
  background-color: var(--primary-blue);
  color: white;
}

.mobile-menu-toggle.active .hamburger-line {
  background-color: white;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 3px;
  background-color: currentColor;
  margin: 3px 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 2px;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* === 📱 Responsive Layout & Mobile Navigation === */

@media (min-width: 380px) {
  .site-header .container {
    padding-inline: 1rem;
  }

  .logo h1 {
    font-size: 1.2rem;
  }
}

@media (min-width: 560px) {
  .logo h1 {
    font-size: 1.35rem;
  }

  .logo-img img {
    height: clamp(40px, 3.6vw, 46px);
  }

  .mobile-menu-toggle {
    width: 48px;
    height: 48px;
    padding: 0.75rem;
  }
}

@media (min-width: 768px) {
  .site-header .container {
    padding-inline: 1.5rem;
  }

  .header-content {
    gap: 1.25rem;
    padding-block: 0.9rem;
    min-height: 60px;
  }

  .logo-container {
    flex: 0 1 auto;
    gap: 0.75rem;
  }

  .logo h1 {
    font-size: 1.5rem;
  }
}

@media (min-width: 960px) {
  .header-content {
    justify-content: flex-start;
  }

  .header-controls {
    margin-left: auto;
    gap: 1rem;
  }

  .mobile-menu-toggle {
    display: none;
  }

  .main-navigation {
    position: static;
    width: auto;
    margin-left: auto;
    padding: 0;
    background: transparent;
    color: var(--text-dark);
    box-shadow: none;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    gap: 0;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    /* Reset mobile fullscreen styles to prevent header height issues */
    /* These properties override mobile-first fixed positioning */
    min-height: auto;
    height: auto;
    top: auto;
    right: auto;
    bottom: auto;
    left: auto;
    overflow-y: visible;
  }

  .main-navigation ul {
    flex-direction: row;
    align-items: center;
    gap: 1rem;
    width: auto;
  }

  .main-navigation li {
    width: auto;
  }

  .main-navigation a {
    justify-content: center;
    font-size: 0.95rem;
    padding: 0.6rem 1.1rem;
    border-radius: 999px;
    min-height: 44px;
    box-shadow: none;
    background: transparent;
    color: var(--text-dark);
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .main-navigation a:hover {
    background: var(--soft-gray);
    color: var(--primary-blue);
    transform: translateY(-1px);
  }

  .main-navigation a.active,
  .main-navigation .current-menu-item > a,
  .main-navigation .current_page_item > a,
  .main-navigation .current-menu-ancestor > a {
    background: rgba(44, 90, 160, 0.1);
    color: var(--primary-blue);
    box-shadow: none;
    font-weight: 600;
  }

  .main-navigation a.active::after,
  .main-navigation .current-menu-item > a::after,
  .main-navigation .current_page_item > a::after,
  .main-navigation .current-menu-ancestor > a::after {
    display: block;
    content: "";
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: linear-gradient(
      90deg,
      var(--primary-blue) 0%,
      var(--accent-red) 100%
    );
    border-radius: 3px;
    animation: slideIn 0.3s ease-out;
  }

  .main-navigation.mobile-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
}

@media (min-width: 1024px) {
  .site-header .container {
    padding-inline: 2rem;
  }

  .header-content {
    gap: 2rem;
    padding-block: 1rem;
    min-height: var(--header-height);
  }

  .logo h1 {
    font-size: 1.65rem;
  }

  .main-navigation ul {
    gap: 1.4rem;
  }

  .main-navigation a {
    font-size: 1rem;
    padding: 0.7rem 1.3rem;
  }
}

body.mobile-menu-open {
  overflow: hidden;
}

.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(17, 36, 64, 0.35);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 1200; /* sit below header so mobile nav remains clickable */
  pointer-events: none;
}

body.mobile-menu-open .mobile-menu-overlay {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* === 🎯 Header Scroll Effects (JavaScript enhancement ready) === */
.site-header.header-hidden {
  transform: translateY(-100%);
}

.site-header.header-compact {
  min-height: 60px;
}

.site-header.header-compact .header-content {
  min-height: 60px;
}

/* === ♿ Accessibility Enhancements === */
@media (prefers-reduced-motion: reduce) {
  .site-header,
  .main-navigation,
  .main-navigation a,
  .logo-container,
  .logo-img img,
  .logo h1 a,
  .mobile-menu-toggle,
  .mobile-menu-overlay {
    transition: none;
    animation: none;
  }

  .main-navigation a.active::after,
  .main-navigation .current-menu-item > a::after,
  .main-navigation .current_page_item > a::after,
  .main-navigation .current-menu-ancestor > a::after {
    animation: none;
  }
}

/* Focus styles for keyboard navigation */
.main-navigation a:focus,
.logo a:focus,
.logo-container:focus {
  outline: 3px solid var(--primary-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

.main-navigation a:focus-visible,
.logo a:focus-visible,
.logo-container:focus-visible {
  outline: 3px solid var(--accent-red);
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(255, 107, 107, 0.2);
}

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 9999;
  background: var(--primary-blue);
  color: white;
  padding: var(--space-sm);
  text-decoration: none;
  border-radius: 4px;
}

.skip-to-main:focus {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  width: auto;
  height: auto;
  overflow: visible;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .site-header {
    border-bottom: 3px solid var(--text-dark);
    background: white;
  }

  .main-navigation a {
    border: 2px solid transparent;
  }

  .main-navigation a:hover,
  .main-navigation a.active,
  .main-navigation .current-menu-item > a,
  .main-navigation .current_page_item > a,
  .main-navigation .current-menu-ancestor > a {
    border-color: var(--primary-blue);
    background: var(--soft-gray);
  }

  .logo h1 a {
    -webkit-text-fill-color: var(--primary-blue);
    color: var(--primary-blue);
  }
}

/* === 🔧 Print Styles === */
@media print {
  .site-header {
    position: static;
    box-shadow: none;
    background: white;
    border-bottom: 1px solid #000;
  }
}

/* === 🌐 Language Switcher === */
.language-switcher {
  position: relative;
  display: inline-block;
}

.language-switcher-button {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--soft-gray);
  border: 1px solid var(--border-light);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.95rem;
  color: var(--text-dark);
  font-weight: 500;
  min-height: 44px;
}

.language-switcher-button:hover {
  background: #e9ecef;
  border-color: var(--primary-blue);
}

.language-switcher-button:focus-visible {
  outline: 3px solid var(--primary-blue);
  outline-offset: 2px;
}

.language-flag {
  font-size: 1.25rem;
  line-height: 1;
}

.language-name {
  font-size: 0.9rem;
  white-space: nowrap;
}

/* Dropdown menu */
.language-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background: white;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1500;
  overflow: hidden;
}

.language-switcher-button[aria-expanded="true"] + .language-dropdown,
.language-switcher:hover .language-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: var(--text-dark);
  font-size: 0.95rem;
  transition: background-color 0.2s ease;
  border-bottom: 1px solid var(--border-light);
}

.language-option:last-child {
  border-bottom: none;
}

.language-option:hover {
  background: var(--soft-gray);
}

.language-option.current {
  background: rgba(44, 90, 160, 0.1);
  color: var(--primary-blue);
  font-weight: 600;
}

.language-option.current .language-flag {
  transform: scale(1.1);
}

/* Mobile adjustments */
@media (max-width: 767px) {
  .language-switcher-button .language-name {
    display: none; /* モバイルではボタン内の言語名のみ非表示 */
  }

  .language-switcher-button {
    padding: 0.6rem 0.75rem;
    min-width: 44px;
    justify-content: center;
  }

  .language-dropdown {
    right: auto;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
  }

  .language-switcher-button[aria-expanded="true"] + .language-dropdown,
  .language-switcher:hover .language-dropdown {
    transform: translateX(-50%) translateY(0);
  }
}