/* ============================================================
   IYOSUI Theme - Global Stylesheet  v1.0.0
   ============================================================ */

/* ----------------------------------------------------------
   1. Design Tokens
   ---------------------------------------------------------- */
:root {
  /* Brand Colors */
  --color-primary:       #1567A8;
  --color-primary-light: #2A88C8;
  --color-primary-dark:  #0C3E6A;
  --color-accent-green:  #3A8C5C;
  --color-accent-warm:   #D97A45;

  /* Text */
  --color-text:          #1A1A2E;
  --color-text-sub:      #5A6476;
  --color-text-white:    #FFFFFF;

  /* Backgrounds */
  --color-bg:            #FFFFFF;
  --color-bg-light:      #F5F9FC;
  --color-bg-dark:       #0C3A60;
  --color-bg-gray:       #EEEFF2;

  /* Border & Divider */
  --color-border:        #D0DFE8;
  --color-border-light:  #E8EEF4;

  /* Typography */
  --font-jp:   'Noto Sans JP', 'Hiragino Sans', 'Meiryo', sans-serif;
  --font-en:   'Montserrat', sans-serif;
  --base-size: 16px;
  --lh-body:   1.8;
  --lh-heading: 1.35;

  /* Spacing */
  --sp-xs:  .5rem;
  --sp-sm:  1rem;
  --sp-md:  2rem;
  --sp-lg:  4rem;
  --sp-xl:  6rem;

  /* Layout */
  --container-max: 1200px;
  --container-pad: 5vw;

  /* Effects */
  --radius:      4px;
  --radius-lg:   8px;
  --shadow-sm:   0 2px 8px rgba(0,0,0,.08);
  --shadow-md:   0 4px 20px rgba(0,0,0,.12);
  --transition:  .25s ease;

  /* Header */
  --header-h: 70px;
}

/* ----------------------------------------------------------
   2. Reset
   ---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: var(--base-size); scroll-behavior: smooth; }

body {
  font-family: var(--font-jp);
  font-size: 1rem;
  line-height: var(--lh-body);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--color-primary); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, select { font: inherit; }
table { border-collapse: collapse; width: 100%; }

/* ----------------------------------------------------------
   3. Base Typography
   ---------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--lh-heading);
  font-weight: 700;
  letter-spacing: .02em;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }

p { margin-bottom: 1.25em; }
p:last-child { margin-bottom: 0; }

/* ----------------------------------------------------------
   4. Layout
   ---------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: 860px;
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--sp-xl);
}

.section--sm {
  padding-block: var(--sp-lg);
}

.section--bg-light { background: var(--color-bg-light); }
.section--bg-gray  { background: var(--color-bg-gray); }
.section--bg-dark  { background: var(--color-bg-dark); color: var(--color-text-white); }

/* Grid */
.grid { display: grid; gap: var(--sp-md); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid--4, .grid--3, .grid--2 { grid-template-columns: 1fr; }
}

/* ----------------------------------------------------------
   5. Section Heading
   ---------------------------------------------------------- */
.sec-head {
  margin-bottom: var(--sp-lg);
}

.sec-head__en {
  display: block;
  font-family: var(--font-en);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: .4em;
}

.sec-head__ja {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
}

.sec-head__sub {
  margin-top: .75em;
  color: var(--color-text-sub);
  font-size: .95rem;
}

.sec-head--center { text-align: center; }

.sec-head--line .sec-head__ja::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-primary);
  margin-top: .6em;
}

.sec-head--center.sec-head--line .sec-head__ja::after {
  margin-inline: auto;
}

/* ----------------------------------------------------------
   6. Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: .75em 2em;
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .05em;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border: 2px solid var(--color-primary);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn--outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn--white {
  background: #fff;
  color: var(--color-primary);
  border: 2px solid #fff;
}
.btn--white:hover {
  background: transparent;
  color: #fff;
}

.btn--arrow::after {
  content: '→';
  font-family: var(--font-en);
}

/* ----------------------------------------------------------
   7. Breadcrumb
   ---------------------------------------------------------- */
.breadcrumb {
  padding-block: .75rem;
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg-light);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .25rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  font-size: .8rem;
  color: var(--color-text-sub);
}

.breadcrumb__item { display: flex; align-items: center; }

.breadcrumb__item + .breadcrumb__item::before {
  content: '›';
  margin-right: .25rem;
  color: var(--color-border);
}

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

.breadcrumb__item--current span { color: var(--color-text-sub); }

/* ----------------------------------------------------------
   8. Inner Page Hero
   ---------------------------------------------------------- */
.page-hero {
  position: relative;
  min-height: 220px;
  display: flex;
  align-items: center;
  background: var(--color-bg-dark);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(12,62,106,.85) 0%, rgba(21,103,168,.65) 100%);
  z-index: 1;
}

.page-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.page-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-block: var(--sp-lg);
}

.page-hero__title {
  color: #fff;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
}

.page-hero__title em {
  display: block;
  font-style: normal;
  font-family: var(--font-en);
  font-size: .45em;
  font-weight: 400;
  letter-spacing: .1em;
  opacity: .85;
  margin-top: .4em;
}

/* ----------------------------------------------------------
   9. Cards
   ---------------------------------------------------------- */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card__img { overflow: hidden; aspect-ratio: 4/3; }
.card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card__img img { transform: scale(1.04); }

.card__body { padding: var(--sp-sm) var(--sp-md); }

.card__cat {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: .05em;
  text-transform: uppercase;
  margin-bottom: .4em;
}

.card__title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: .5em;
}

.card__meta {
  font-size: .8rem;
  color: var(--color-text-sub);
}

/* ----------------------------------------------------------
   10. News List (共通)
   ---------------------------------------------------------- */
.news-list { }

.news-item {
  display: grid;
  grid-template-columns: 9em 1fr;
  gap: .75rem var(--sp-sm);
  align-items: baseline;
  padding-block: 1rem;
  border-bottom: 1px solid var(--color-border-light);
  font-size: .9rem;
}

.news-item:first-child { border-top: 1px solid var(--color-border-light); }

.news-item__date {
  color: var(--color-text-sub);
  font-family: var(--font-en);
  font-size: .85rem;
  white-space: nowrap;
}

.news-item__cat {
  display: inline-block;
  padding: .1em .6em;
  font-size: .7rem;
  font-weight: 600;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--radius);
  white-space: nowrap;
  margin-right: .5em;
}

.news-item__title a:hover { color: var(--color-primary); text-decoration: underline; }

/* ----------------------------------------------------------
   11. Pagination
   ---------------------------------------------------------- */
.pagination {
  display: flex;
  justify-content: center;
  gap: .5rem;
  padding-block: var(--sp-lg);
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: .9rem;
  transition: background var(--transition), color var(--transition);
}

.pagination a:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.pagination .current {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  font-weight: 700;
}

/* ----------------------------------------------------------
   12. Tags / Category Badges
   ---------------------------------------------------------- */
.tag {
  display: inline-block;
  padding: .2em .8em;
  font-size: .75rem;
  font-weight: 600;
  border-radius: 2em;
  background: var(--color-bg-light);
  color: var(--color-text-sub);
  border: 1px solid var(--color-border);
}

.tag--primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.tag--green   { background: var(--color-accent-green); color: #fff; border-color: var(--color-accent-green); }

/* ----------------------------------------------------------
   13. Related Page Banners
   ---------------------------------------------------------- */
.related-pages { padding-block: var(--sp-lg); background: var(--color-bg-gray); }

.related-pages__grid {
  display: grid;
  gap: 1px;
  background: var(--color-border);
}

.related-page-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--sp-lg) var(--sp-md);
  background: var(--color-bg);
  transition: background var(--transition);
  min-height: 140px;
}

.related-page-item:hover { background: var(--color-bg-light); }

.related-page-item__ja {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: .25em;
}

.related-page-item__en {
  font-family: var(--font-en);
  font-size: .75rem;
  color: var(--color-text-sub);
  letter-spacing: .08em;
}

/* ----------------------------------------------------------
   14. Social Links
   ---------------------------------------------------------- */
.social-links {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  font-size: .85rem;
  color: var(--color-text-sub);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.social-link:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ----------------------------------------------------------
   15. Entry Content (Gutenbergブロック)
   ---------------------------------------------------------- */
.entry-content { max-width: 800px; }

.entry-content h2,
.entry-content h3,
.entry-content h4 {
  margin-top: 2em;
  margin-bottom: .75em;
}

.entry-content h2 {
  font-size: 1.5rem;
  padding-left: .75em;
  border-left: 4px solid var(--color-primary);
}

.entry-content h3 {
  font-size: 1.2rem;
  color: var(--color-primary-dark);
}

.entry-content ul, .entry-content ol {
  list-style: disc;
  padding-left: 1.5em;
  margin-bottom: 1.25em;
}

.entry-content ol { list-style: decimal; }

.entry-content table {
  margin-bottom: 1.5em;
  font-size: .9rem;
}

.entry-content th,
.entry-content td {
  padding: .6em 1em;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.entry-content th {
  background: var(--color-bg-light);
  font-weight: 700;
}

.entry-content a {
  color: var(--color-primary);
  text-decoration: underline;
}

.entry-content figure { margin-block: 1.5em; }
.entry-content figcaption { font-size: .8rem; color: var(--color-text-sub); margin-top: .5em; }

/* ----------------------------------------------------------
   16. Site Header
   ---------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #fff;
  box-shadow: 0 1px 0 var(--color-border-light);
  transition: box-shadow var(--transition);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

/* Utility bar (top row) */
.site-header__utility {
  background: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border-light);
}

.site-header__utility-inner {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: .1rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  padding-block: .35rem;
}

.utility-nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.utility-nav li a {
  display: inline-block;
  padding: .25rem .75rem;
  font-size: .78rem;
  color: var(--color-text-sub);
  transition: color var(--transition);
  border-right: 1px solid var(--color-border-light);
}

.utility-nav li:last-child a { border-right: none; }

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

/* Main header row */
.site-header__main {
  height: var(--header-h);
}

.site-header__main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  gap: var(--sp-md);
}

/* Logo */
.site-header__logo a {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  color: var(--color-text);
}

.site-header__logo-name {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--color-primary);
}

.site-header__logo-tagline {
  font-size: .68rem;
  color: var(--color-text-sub);
  letter-spacing: .03em;
}

/* Main nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.main-nav li { position: relative; }

.main-nav > li > a {
  display: inline-flex;
  align-items: center;
  height: var(--header-h);
  padding-inline: .75rem;
  font-size: .82rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  transition: color var(--transition);
  border-bottom: 3px solid transparent;
}

.main-nav > li > a:hover,
.main-nav > li.current-menu-item > a,
.main-nav > li.current-page-ancestor > a {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: .4rem;
  flex-shrink: 0;
}

.hamburger__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ----------------------------------------------------------
   17. Mobile Menu
   ---------------------------------------------------------- */
.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 999;
  width: min(320px, 85vw);
  height: 100dvh;
  background: #fff;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform .35s cubic-bezier(.4,0,.2,1);
  padding-top: var(--header-h);
  box-shadow: var(--shadow-md);
}

.mobile-menu.is-open { transform: translateX(0); }

.mobile-nav { padding: var(--sp-sm) 0; }

.mobile-nav li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 1.5rem;
  font-size: .95rem;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
}

.mobile-nav li a::after { content: '›'; color: var(--color-primary); }

.mobile-nav li a:hover { background: var(--color-bg-light); color: var(--color-primary); }

.mobile-menu__utility {
  padding: var(--sp-sm) 1.5rem var(--sp-md);
  display: flex;
  flex-direction: column;
  gap: .5rem;
  border-top: 1px solid var(--color-border-light);
}

.mobile-menu__utility a {
  font-size: .85rem;
  color: var(--color-text-sub);
  padding: .4rem 0;
}

.mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 998;
  background: rgba(0,0,0,.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.mobile-overlay.is-active {
  opacity: 1;
  pointer-events: all;
}

/* ----------------------------------------------------------
   18. Site Footer
   ---------------------------------------------------------- */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,.85);
}

.site-footer__main {
  padding-block: var(--sp-xl) var(--sp-lg);
}

.site-footer__main-inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--sp-xl);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.footer-brand__name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: .5rem;
}

.footer-brand__tagline {
  font-size: .8rem;
  opacity: .7;
  margin-bottom: var(--sp-md);
  font-family: var(--font-en);
}

.footer-brand__address {
  font-size: .8rem;
  line-height: 1.9;
  opacity: .75;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-md);
}

.footer-nav__col h4 {
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: rgba(255,255,255,.5);
  margin-bottom: .75rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.footer-nav__col ul li a {
  display: block;
  font-size: .82rem;
  padding-block: .3rem;
  opacity: .75;
  transition: opacity var(--transition);
}

.footer-nav__col ul li a:hover { opacity: 1; color: #fff; }

.site-footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-block: 1rem;
}

.site-footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.footer-legal {
  display: flex;
  gap: var(--sp-sm);
  font-size: .78rem;
  opacity: .6;
}

.footer-legal a:hover { opacity: 1; text-decoration: underline; }

.footer-copy {
  font-size: .75rem;
  font-family: var(--font-en);
  opacity: .5;
}

/* ----------------------------------------------------------
   19. Main content offset for sticky header
   ---------------------------------------------------------- */
.l-main { padding-top: 0; }

/* ----------------------------------------------------------
   20. Utility
   ---------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

.text-center { text-align: center; }
.text-right  { text-align: right; }

.mt-sm { margin-top: var(--sp-sm); }
.mt-md { margin-top: var(--sp-md); }
.mt-lg { margin-top: var(--sp-lg); }

/* ----------------------------------------------------------
   21. Responsive — Mobile
   ---------------------------------------------------------- */
@media (max-width: 1080px) {
  .main-nav > li > a { padding-inline: .55rem; font-size: .78rem; }
}

@media (max-width: 900px) {
  :root { --header-h: 60px; }

  .site-header__utility { display: none; }

  .main-nav { display: none; }

  .hamburger { display: flex; }

  .site-footer__main-inner {
    grid-template-columns: 1fr;
    gap: var(--sp-lg);
  }

  .footer-nav { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  :root {
    --sp-xl: 4rem;
    --sp-lg: 3rem;
    --container-pad: 1.25rem;
  }

  .footer-nav { grid-template-columns: 1fr; }

  .news-item { grid-template-columns: 1fr; }
  .news-item__date { display: none; }

  .site-footer__bottom-inner { flex-direction: column; align-items: flex-start; }
}