:root {
  --color-primary: #004ea2;
  --color-primary-rgb: 0, 78, 162;
  --color-primary-hover: #003772;
  --color-primary-active: #00254c;
  --color-primary-light: #e6f0fa;
  --color-primary-tint: #d8e8f8;
  --color-primary-surface: #f4f8fc;
  --color-primary-border: #b9d8f3;

  --color-success: #006644;
  --color-success-bg: #e6f6ee;
  --color-success-border: #a3e0c4;
  --color-warning: #944a00;
  --color-warning-bg: #fff5e6;
  --color-warning-border: #ffd8a8;
  --color-error: #b5282a;
  --color-error-hover: #931f21;
  --color-error-bg: #fde8e8;
  --color-error-bg-strong: #fee2e2;
  --color-error-bg-soft: #fffafb;
  --color-error-border: #fca5a5;
  --color-info: var(--color-primary);
  --color-info-bg: var(--color-primary-light);

  --focus-ring-color: var(--color-primary);
  --focus-ring-shadow: rgba(var(--color-primary-rgb), 0.25);

  --color-text-main: #1a1a1a;
  --color-text-muted: #4d4d4d;
  --color-text-inverse: #ffffff;
  --color-link-visited: #5c248b;
  --color-bg-page: #f9fafb;
  --color-bg-surface: #ffffff;
  --color-bg-muted: #f3f4f6;
  --color-bg-code: #edf2f7;
  --color-bg-row-header: #fafbfd;

  --color-border: #d7d8d9;
  --color-border-dark: #8e9094;

  --color-pre-bg: #1e293b;
  --color-pre-text: #f8fafc;

  --color-footer-bg: #1a1a1a;
  --color-footer-text: #d7d8d9;
  --color-footer-muted: #8e9094;

  --font-family-base: "Noto Sans JP", "BIZ UDPGothic", "Hiragino Kaku Gothic ProN", "Meiryo", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Consolas", "Courier New", monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;

  --line-height-tight: 1.35;
  --line-height-relaxed: 1.75;

  --container-max: 1120px;
  --container-narrow-max: 720px;
  --radius-xs: 2px;
  --radius-sm: 4px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-btn: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 4px 6px 16px rgba(0, 50, 110, 0.12);
  --shadow-card-active: 2px 3px 8px rgba(0, 50, 110, 0.1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family-base);
  font-size: 100%;
  line-height: var(--line-height-relaxed);
  color: var(--color-text-main);
  background-color: var(--color-bg-page);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-wrap: break-word;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
  padding-bottom: 4rem;
}

img, svg, video {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

:where(a) {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}
:where(a:hover) {
  color: var(--color-primary-hover);
}
:where(a:visited) {
  color: var(--color-link-visited);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-main);
  line-height: var(--line-height-tight);
  font-weight: 700;
}

h1 {
  font-size: var(--font-size-3xl);
  margin: 2rem 0 1.25rem;
}

h2 {
  font-size: var(--font-size-2xl);
  margin: 3rem 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}
h2::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 60px;
  height: 2px;
  background-color: var(--color-primary);
}

h3 {
  font-size: var(--font-size-xl);
  margin: 2rem 0 1rem;
}

h4 {
  font-size: var(--font-size-lg);
  margin: 1.5rem 0 0.75rem;
}

h5 {
  font-size: var(--font-size-base);
  margin: 1.25rem 0 0.5rem;
}

h6 {
  font-size: var(--font-size-sm);
  margin: 1rem 0 0.5rem;
  color: var(--color-text-muted);
}

p {
  margin-bottom: 1.25rem;
}

code {
  font-family: var(--font-family-mono);
  background-color: var(--color-bg-code);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-xs);
  font-size: 0.9em;
  border: 1px solid var(--color-border);
}

pre {
  font-family: var(--font-family-mono);
  background-color: var(--color-pre-bg);
  color: var(--color-pre-text);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 1.5rem 0;
}
pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background-color: var(--color-primary-surface);
  border-left: 4px solid var(--color-primary);
  color: var(--color-text-main);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
}

ul, ol {
  margin: 1rem 0 1.5rem 1.5rem;
  line-height: var(--line-height-relaxed);
}

li {
  margin-bottom: 0.35rem;
}

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

:focus-visible {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--focus-ring-shadow);
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: 0.75rem 1.25rem;
  z-index: 9999;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container--narrow {
  max-width: var(--container-narrow-max);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.mb-0 { margin-bottom: 0 !important; }
.mb-4 { margin-bottom: 1rem !important; }
.mt-4 { margin-top: 1rem !important; }
.text-sub {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}
.text-center { text-align: center !important; }

.site-header {
  background-color: var(--color-bg-surface);
  border-bottom: 2px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.5rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.site-header__logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.global-nav ul {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.global-nav li {
  margin: 0;
}

.global-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.25rem;
  color: var(--color-text-main);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--font-size-base);
  border-bottom: 3px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.global-nav a:hover {
  color: var(--color-primary);
}

.global-nav a[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.breadcrumb {
  padding: 1rem 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--font-size-sm);
}

.breadcrumb li {
  margin: 0;
  display: flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "›";
  content: "›" / "";
  margin: 0 0.5rem;
  color: var(--color-text-muted);
  font-weight: 700;
}

.breadcrumb li[aria-current="page"] {
  color: var(--color-text-muted);
  font-weight: 700;
}

.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-primary-border);
  border-left: 5px solid var(--color-info);
  background-color: var(--color-info-bg);
  margin-bottom: 1.25rem;
  color: var(--color-text-main);
}

.alert__title {
  font-weight: 700;
  font-size: var(--font-size-base);
  margin-bottom: 0.25rem;
  color: var(--color-info);
}

.alert--success {
  border-color: var(--color-success-border);
  border-left-color: var(--color-success);
  background-color: var(--color-success-bg);
}
.alert--success .alert__title {
  color: var(--color-success);
}

.alert--warning {
  border-color: var(--color-warning-border);
  border-left-color: var(--color-warning);
  background-color: var(--color-warning-bg);
}
.alert--warning .alert__title {
  color: var(--color-warning);
}

.alert--error {
  border-color: var(--color-error-border);
  border-left-color: var(--color-error);
  background-color: var(--color-error-bg);
}
.alert--error .alert__title {
  color: var(--color-error);
}

.alert p:last-child {
  margin-bottom: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-family: inherit;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  line-height: var(--line-height-tight);
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: transparent;
  transition: background-color 0.15s ease;
  pointer-events: none;
}

.btn:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-btn);
}

.btn:hover:not(:disabled)::after {
  background-color: rgba(255, 255, 255, 0.08);
}

.btn:active:not(:disabled) {
  background-color: var(--color-primary-active);
  border-color: var(--color-primary-active);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--color-border-dark);
  border-color: var(--color-border-dark);
}
.btn[aria-disabled="true"] {
  pointer-events: none;
}

.btn--secondary {
  background-color: var(--color-bg-surface);
  color: var(--color-primary);
}
.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-primary-light);
  color: var(--color-primary-hover);
}
.btn--secondary:active:not(:disabled) {
  background-color: var(--color-primary-tint);
}
.btn--secondary:disabled,
.btn--secondary[aria-disabled="true"] {
  background-color: var(--color-bg-surface);
  color: var(--color-text-muted);
}

.btn--text {
  background-color: transparent;
  color: var(--color-primary);
  border-color: transparent;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.btn--text:hover:not(:disabled) {
  background-color: var(--color-primary-light);
  border-color: transparent;
  box-shadow: none;
  color: var(--color-primary-hover);
}
.btn--text:active:not(:disabled) {
  background-color: var(--color-primary-tint);
  border-color: transparent;
}
.btn--text:disabled,
.btn--text[aria-disabled="true"] {
  background-color: transparent;
  border-color: transparent;
  color: var(--color-text-muted);
}

.btn--danger {
  background-color: var(--color-error);
  border-color: var(--color-error);
  color: var(--color-text-inverse);
}
.btn--danger:hover:not(:disabled),
.btn--danger:active:not(:disabled) {
  background-color: var(--color-error-hover);
  border-color: var(--color-error-hover);
}

.btn--sm {
  min-height: 38px;
  padding: 0.4rem 0.85rem;
  font-size: var(--font-size-sm);
}
.btn--lg {
  min-height: 52px;
  padding: 0.9rem 2rem;
  font-size: var(--font-size-lg);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: var(--font-size-sm);
  font-weight: 700;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-bg-surface);
}

.badge--solid {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.card--accent {
  border-top: 4px solid var(--color-primary);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.card--link {
  cursor: pointer;
}
.card--link a::after {
  content: "";
  position: absolute;
  inset: 0;
}
.card--link:hover,
.card--link:focus-within {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary-border);
}
.card--link:active {
  box-shadow: var(--shadow-card-active);
}

.card--link a:focus-visible {
  outline: none;
  box-shadow: none;
}
.card--link a:focus-visible::after {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.link-list li {
  margin: 0;
  border-bottom: 1px solid var(--color-border);
}

.link-list a {
  display: block;
  padding: 0.85rem 2rem 0.85rem 0.5rem;
  text-decoration: none;
  font-weight: 700;
  color: var(--color-text-main);
  position: relative;
}

.link-list a::after {
  content: "›";
  content: "›" / "";
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--color-primary);
}

.link-list a:hover {
  background-color: var(--color-primary-surface);
  color: var(--color-primary);
}

.form-group {
  margin-bottom: 1.75rem;
}

.form-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: var(--font-size-base);
  margin-bottom: 0.4rem;
  color: var(--color-text-main);
}

.required, .optional {
  font-size: var(--font-size-sm);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-xs);
  font-weight: 700;
}

.required {
  background-color: var(--color-error-bg-strong);
  color: var(--color-error);
  border: 1px solid var(--color-error-border);
}

.optional {
  background-color: var(--color-bg-muted);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.form-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
}

.form-error {
  font-size: var(--font-size-sm);
  color: var(--color-error);
  font-weight: 700;
  margin-top: 0.4rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="url"],
input[type="search"],
input[type="number"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-base);
  font-family: inherit;
  border: 1.5px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-surface);
  color: var(--color-text-main);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="search"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
select:focus,
textarea:focus {
  border-color: var(--color-primary);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input:disabled,
select:disabled,
textarea:disabled {
  background-color: var(--color-bg-muted);
  border-color: var(--color-border);
  color: var(--color-border-dark);
  cursor: not-allowed;
}

.is-error input,
.is-error select,
.is-error textarea,
input.is-error,
select.is-error,
textarea.is-error,
input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-width: 2px;
  border-color: var(--color-error);
  background-color: var(--color-error-bg-soft);
  padding: calc(0.75rem - 0.5px) calc(1rem - 0.5px);
}

fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin-bottom: 1.75rem;
  background-color: var(--color-bg-surface);
}

legend {
  font-weight: 700;
  padding: 0 0.5rem;
  font-size: var(--font-size-base);
}

.form-check {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.25rem 0;
  font-size: var(--font-size-base);
  margin-right: 1.5rem;
  cursor: pointer;
}

.form-check input[type="radio"],
.form-check input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin: 1.5rem 0;
  background-color: var(--color-bg-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: var(--font-size-base);
}

caption {
  font-weight: 700;
  text-align: left;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-base);
  color: var(--color-text-main);
  background-color: var(--color-primary-surface);
  border-bottom: 1px solid var(--color-border);
}

th, td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

thead th {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--font-size-sm);
  border-bottom: 2px solid var(--color-primary);
}

tbody th[scope="row"] {
  font-weight: 700;
  background-color: var(--color-bg-row-header);
}

tbody tr:hover > * {
  background-color: var(--color-primary-surface);
}

.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
  --focus-ring-color: #ffffff;
  --focus-ring-shadow: rgba(253, 218, 36, 0.4);
}

.site-footer ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0 0 1.5rem 0;
  padding: 0;
  flex-wrap: wrap;
}

.site-footer li {
  margin: 0;
}

.site-footer a {
  color: var(--color-footer-text);
  font-size: var(--font-size-sm);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer a:hover {
  color: var(--color-text-inverse);
}

.site-footer small {
  color: var(--color-footer-muted);
  font-size: var(--font-size-xs);
}

@media print {
  body {
    background: #fff;
    color: #000;
  }
  .site-header,
  .site-footer,
  .skip-link,
  .btn {
    display: none !important;
  }
  a {
    text-decoration: underline;
    color: #000;
  }
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}

@media (forced-colors: active) {
  .btn:not(.btn--text) {
    border: 2px solid ButtonText;
  }
  h2::before {
    background-color: Highlight;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    flex-direction: column;
    padding-top: 1rem;
    padding-bottom: 1rem;
    gap: 0.75rem;
  }
  .global-nav ul {
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
  }
  .grid--2, .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }
}