:root {
  --color-primary: #FFE5A3;
  --color-secondary: #FF6B00;
  --color-background: #ffffff;
  --color-surface: #f8f9fa;
  --color-text: #000000;
  --color-text-light: #4A5568;
  --color-border: #E2E8F0;
  --color-link: #FF6B00;
  --color-link-hover: #FFB800;
  --color-focus: #2563eb;
  --font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
}

body {
  font-family: var(--font-family);
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-background);
  margin: 0;
  padding: 0;
  font-size: 100%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

header {
  background-color: var(--color-background);
  color: var(--color-text);
  text-align: center;
  padding: 20px 0;
  position: relative;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo-container {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--color-text);
}

.logo {
  height: 50px;
  width: auto;
  margin-right: 20px;
}

h1 {
  margin: 0;
  font-size: 1.8em;
  color: var(--color-text);
}

h2 {
  color: var(--color-secondary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 10px;
  font-size: 1.5em;
}

.section {
  background-color: var(--color-surface);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: 20px;
  table-layout: fixed;
}

th {
  width: 40%;
  background-color: var(--color-primary);
  color: var(--color-text);
  font-weight: bold;
}

td {
  width: 60%;
  background-color: var(--color-background);
}

th, td {
  border: 1px solid var(--color-border);
  padding: 12px;
  text-align: left;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  padding: 0.2em;
  margin: -0.2em;
  transition: color 0.3s ease;
  font-weight: 500;
}

a:hover, a:focus {
  color: var(--color-link-hover);
  text-decoration: none;
  outline: 3px solid var(--color-link-hover);
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-secondary);
  color: white;
  padding: 8px;
  z-index: 100;
  text-decoration: none;
  transition: top 0.3s ease;
}

.skip-link:focus {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  padding: 1rem;
  background: var(--color-focus);
  color: white;
  text-decoration: none;
  border-radius: 0 0 0.5rem 0.5rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

#languageSwitch {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: var(--color-secondary);
  color: white;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 1em;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}

#languageSwitch:hover, #languageSwitch:focus {
  background-color: var(--color-primary);
}

.sub-table {
  width: 100%;
  margin-top: 10px;
  border-collapse: separate;
  border-spacing: 0;
}

.sub-table th, 
.sub-table td {
  border: 1px solid var(--color-border);
  padding: 8px;
  font-size: 0.9em;
  background-color: var(--color-background);
}

.sub-table th {
  background-color: var(--color-surface);
  font-weight: normal;
  width: 40%;
  color: var(--color-text);
}

.sub-table td {
  width: 60%;
}

.title-main {  
  display: block;  
}  

.title-sub {  
  display: block;  
  font-size: 0.8em;  
  color: var(--color-text-light);  
  margin-top: 0.5em;  
}  

html[lang="en"] .title-sub {
  display: none;
}

nav.breadcrumb {
  margin: 0 20px;
  padding: 10px 0;
  font-size: 0.95em;
}

nav.breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 5px;
}

nav.breadcrumb li + li:before {
  content: ">";
  margin-right: 5px;
  color: var(--color-text-light);
}

nav.breadcrumb a {
  color: var(--color-link);
  text-decoration: underline;
}

nav.breadcrumb a:hover,
nav.breadcrumb a:focus {
  color: var(--color-link-hover);
  outline: 3px solid var(--color-link-hover);
  text-decoration: none;
}

@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  .header-content {
    flex-direction: column;
    text-align: center;
  }
  .logo {
    margin-right: 0;
    margin-bottom: 10px;
  }
  h1 {
    font-size: 1.5em;
  }
  table, thead, tbody, th, td, tr {
    display: block;
  }
  th, td {
    width: 100%;
  }
  th {
    text-align: center;
    border-bottom: none;
  }
  td {
    border-top: none;
  }
  tr {
    margin-bottom: 10px;
  }
  table, th, td {
    font-size: 16px;
  }
  #languageSwitch {
    position: static;
    display: block;
    margin: 10px auto;
  }

  .sub-table, 
  .sub-table tbody, 
  .sub-table tr,
  .sub-table th, 
  .sub-table td {
    display: block;
    width: 100%;
  }
  .sub-table th {
    text-align: left;
    border-bottom: none;
  }
  .sub-table td {
    border-top: none;
  }
}

@media (min-width: 769px) {
  body {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

*:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.broken-link {
    color: #666;
    text-decoration: line-through;
    cursor: not-allowed;
}

.broken-link::after {
    content: " (リンク切れの可能性あり)";
    font-size: 0.9em;
    color: #d32f2f;
}