/* ============================================================
   CSS Custom Properties
============================================================ */
:root {
  --color-primary:       #0d2137;
  --color-primary-light: #1a4068;
  --color-accent:        #00b4a0;
  --color-accent-hover:  #009e8c;
  --color-accent-2:      #e8a020;
  --color-text:          #1e2a35;
  --color-text-light:    #6b7785;
  --color-bg:            #f7f8fa;
  --color-bg-light:      #eef0f4;
  --color-white:         #ffffff;
  --color-border:        #dde3e8;
  --color-dark:          #0a1520;

  --font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans',
                 'BIZ UDPGothic', Meiryo, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.85;

  --container-max: 1240px;
  --container-pad: 24px;
  --header-height: 76px;

  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   16px;
  --radius-pill: 100px;

  --shadow-sm:  0 2px 8px rgba(0, 0, 0, 0.07);
  --shadow-md:  0 4px 20px rgba(0, 0, 0, 0.10);
  --shadow-lg:  0 8px 40px rgba(0, 0, 0, 0.14);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.16);

  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);

  --sidebar-width: 300px;
  --content-gap:   40px;
}

/* ============================================================
   Reset & Base
============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

/* ============================================================
   Accessibility
============================================================ */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  z-index: 9999;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 8px 16px;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 0;
}

.screen-reader-text {
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  word-wrap: normal !important;
}

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

/* ============================================================
   Buttons
============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition),
              box-shadow var(--transition), transform var(--transition);
  cursor: pointer;
  line-height: 1.4;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(0, 180, 160, 0.30);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 6px 20px rgba(0, 180, 160, 0.40);
  transform: translateY(-2px);
}

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

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ============================================================
   Site Header
============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
}

/* Logo */
.site-logo {
  flex-shrink: 0;
}

.site-logo a {
  display: flex;
  align-items: center;
}

.site-logo__img {
  height: 44px;
  width: auto;
  object-fit: contain;
}

.site-logo__text {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Global Nav */
.gnav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.gnav__item {
  position: relative;
}

.gnav__link {
  display: block;
  padding: 10px 14px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}

.gnav__link:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* Dropdown */
.gnav__item--has-child:hover .gnav__dropdown,
.gnav__item--has-child:focus-within .gnav__dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.gnav__dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 200px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--transition), transform var(--transition);
  z-index: 100;
  overflow: hidden;
}

.gnav__dropdown li a {
  display: block;
  padding: 10px 18px;
  font-size: 0.875rem;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}

.gnav__dropdown li a:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* Search Toggle Button */
.search-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  transition: background var(--transition), color var(--transition);
}

.search-toggle:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.hamburger:hover {
  background: var(--color-bg);
}

.hamburger__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.is-open .hamburger__bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger.is-open .hamburger__bar:nth-child(2) {
  opacity: 0;
}
.hamburger.is-open .hamburger__bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ============================================================
   Mobile Menu
============================================================ */
.sp-menu {
  position: fixed;
  top: var(--header-height);
  right: 0;
  bottom: 0;
  width: min(340px, 90vw);
  background: var(--color-white);
  z-index: 800;
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
}

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

.sp-menu__inner {
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sp-menu__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sp-menu__list li a {
  display: block;
  padding: 12px 16px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-primary);
  border-radius: var(--radius-md);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), color var(--transition);
}

.sp-menu__list li a:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

.sp-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.40);
  z-index: 700;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.sp-menu-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* ハンバーガーメニュー カテゴリー・ページセクション */
.sp-menu__section {
  border-top: 1px solid var(--color-border);
  padding-top: 8px;
}

.sp-menu__section-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-light);
  padding: 8px 16px 6px;
  margin: 0;
}

.sp-menu__sub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-bottom: 4px;
}

.sp-menu__sub-list li a {
  display: block;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), color var(--transition);
}

.sp-menu__sub-list li:last-child a {
  border-bottom: none;
}

.sp-menu__sub-list li a:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* ============================================================
   Search Overlay
============================================================ */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 21, 32, 0.92);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.search-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.search-overlay__inner {
  width: min(640px, 92vw);
  position: relative;
}

.search-overlay__close {
  position: absolute;
  top: -56px;
  right: 0;
  color: var(--color-white);
  opacity: 0.7;
  transition: opacity var(--transition);
}

.search-overlay__close:hover {
  opacity: 1;
}

.search-overlay .search-form__input {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  font-size: 1.25rem;
  padding: 18px 60px 18px 24px;
}

.search-overlay .search-form__input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.search-overlay .search-form__btn {
  color: var(--color-white);
}

/* ============================================================
   Search Form
============================================================ */
.search-form {
  position: relative;
  width: 100%;
}

.search-form__input {
  width: 100%;
  padding: 12px 52px 12px 18px;
  font-size: 1rem;
  font-family: var(--font-family);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-white);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-form__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 180, 160, 0.15);
}

.search-form__btn {
  position: absolute;
  top: 50%;
  right: 14px;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  color: var(--color-text-light);
  transition: color var(--transition);
}

.search-form__btn:hover {
  color: var(--color-accent);
}

/* ============================================================
   Breadcrumbs
============================================================ */
.breadcrumbs {
  padding-block: 12px;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

.breadcrumbs__list li + li::before {
  content: '›';
  margin-right: 6px;
  opacity: 0.5;
}

.breadcrumbs__list a {
  color: var(--color-text-light);
  transition: color var(--transition);
}

.breadcrumbs__list a:hover {
  color: var(--color-accent);
}

/* ============================================================
   Page Header
============================================================ */
.page-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 24px;
}

.page-header--article {
  padding-bottom: 0;
}

.page-header__title {
  font-size: clamp(1.375rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-primary);
  padding-top: 8px;
}

.page-header__desc {
  margin-top: 12px;
  font-size: 0.9375rem;
  color: var(--color-text-light);
  max-width: 600px;
}

/* ============================================================
   Layout: Main Wrap
============================================================ */
.main-wrap {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--content-gap);
  padding-top: 40px;
  padding-bottom: 60px;
  align-items: start;
}

.content-box {
  min-width: 0;
}

/* ============================================================
   Hero Slider (FV)
============================================================ */
.fv-slider {
  position: relative;
  overflow: hidden;
  background: var(--color-dark);
  padding-block: 32px;
}

.fv-slider__track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
  gap: 20px;
  padding-inline: calc(50% - 380px);
}

.fv-slider__item {
  flex: 0 0 760px;
  max-width: 760px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  opacity: 0.5;
  transform: scale(0.92);
  transition: opacity 0.5s var(--transition), transform 0.5s var(--transition);
}

.fv-slider__item.is-active {
  opacity: 1;
  transform: scale(1);
}

.fv-slider__link {
  display: block;
}

.fv-slider__img-box {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.fv-slider__img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--transition);
}

.fv-slider__item.is-active .fv-slider__img-box img:hover {
  transform: scale(1.03);
}

.fv-slider__no-img {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
}

.fv-slider__text {
  padding: 20px 24px;
  background: var(--color-white);
}

.fv-slider__title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--color-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.fv-slider__date {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-top: 6px;
}

.fv-slider__nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}

.fv-slider__prev,
.fv-slider__next {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  transition: background var(--transition);
}

.fv-slider__prev:hover,
.fv-slider__next:hover {
  background: rgba(255, 255, 255, 0.28);
}

.fv-slider__dots {
  display: flex;
  gap: 8px;
}

.fv-slider__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
}

.fv-slider__dot.is-active {
  background: var(--color-accent);
  transform: scale(1.4);
}

/* ============================================================
   Section Titles
============================================================ */
.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--color-accent);
}

.section-title__en {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.section-title__ja {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
}

.section-title:has(.section-title__en) .section-title__ja {
  font-size: 0.875rem;
}

.section-title:not(:has(.section-title__en)) .section-title__ja {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.main-section {
  margin-bottom: 52px;
}

/* ============================================================
   Article Card Grid
============================================================ */
.article-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 28px;
}

.article-list--3col {
  grid-template-columns: repeat(3, 1fr);
}

.article-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.article-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
}

.article-card__link {
  display: block;
  text-decoration: none;
}

.article-card__img-box {
  position: relative;
  width: 100%;
  padding-top: 66.66%;
  overflow: hidden;
}

.article-card__img-box img,
.article-card__no-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-card__img-box img {
  transition: transform 0.5s var(--transition);
}

.article-card:hover .article-card__img-box img {
  transform: scale(1.05);
}

.article-card__no-img {
  background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-border) 100%);
}

.article-card__body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-card__date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-card__title {
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--color-primary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 4px;
}

.article-card__excerpt {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Category Tags */
.cat-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.cat-tags li a {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(0, 180, 160, 0.10);
  color: var(--color-accent);
  border: 1px solid rgba(0, 180, 160, 0.25);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}

.cat-tags li a:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

/* Archive / More link */
.archive-link {
  text-align: right;
}

.archive-link a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  padding: 8px 18px;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition);
}

.archive-link a::after {
  content: '→';
}

.archive-link a:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

/* ============================================================
   Sidebar
============================================================ */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.side-widget {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.side-widget__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-primary);
  padding: 14px 20px;
  margin: 0;
  letter-spacing: 0.03em;
  line-height: 1.4;
}

.side-widget__content {
  padding: 0;
}

/* 検索フォーム */
.side-widget__content > .search-form {
  padding: 18px 20px 20px;
  display: block;
}

/* ============================================================
   WordPress ウィジェット出力への余白スタイル
   dynamic_sidebar() が出力する ul は .side-widget の直接の子要素
============================================================ */
.side-widget > ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.side-widget > ul > li {
  padding: 13px 20px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text-light);
  transition: background var(--transition);
}

.side-widget > ul > li:last-child {
  border-bottom: none;
}

.side-widget > ul > li:hover {
  background: var(--color-bg);
}

.side-widget > ul > li > a {
  display: block;
  color: var(--color-text);
  font-weight: 600;
  line-height: 1.55;
  transition: color var(--transition);
}

.side-widget > ul > li > a:hover {
  color: var(--color-accent);
}

/* 投稿日（最近の投稿ウィジェットの日付表示） */
.side-widget .post-date {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-top: 5px;
  font-weight: 400;
}

/* カテゴリーウィジェットの件数テキスト */
.side-widget > ul > li .post-count {
  color: var(--color-text-light);
  font-size: 0.8rem;
  font-weight: 400;
}

/* Popular / Recent Posts in Sidebar */
.side-posts,
.side-recent {
  display: flex;
  flex-direction: column;
}

.side-posts__item,
.side-recent__item {
  border-bottom: 1px solid var(--color-border);
}

.side-posts__item:last-child,
.side-recent__item:last-child {
  border-bottom: none;
}

.side-posts__link,
.side-recent__link {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  transition: opacity var(--transition);
}

.side-posts__link:hover,
.side-recent__link:hover {
  opacity: 0.75;
  background: var(--color-bg);
}

.side-posts__thumb,
.side-recent__thumb {
  flex-shrink: 0;
  width: 80px;
  height: 56px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.side-posts__thumb img,
.side-recent__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.side-posts__body,
.side-recent__body {
  flex: 1;
  min-width: 0;
}

.side-posts__title,
.side-recent__title {
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--color-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 6px;
}

.side-posts__date,
.side-recent__date {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* Category list in sidebar */
.side-cats {
  display: flex;
  flex-direction: column;
}

.side-cats__item {
  border-bottom: 1px solid var(--color-border);
}

.side-cats__item:last-child {
  border-bottom: none;
}

.side-cats__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 20px;
  font-size: 0.875rem;
  color: var(--color-text);
  transition: color var(--transition), background var(--transition);
}

.side-cats__link:hover {
  color: var(--color-accent);
  background: var(--color-bg);
}

.side-cats__count {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.side-cats__empty {
  padding: 16px 20px;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* ============================================================
   Article Detail (single.php)
============================================================ */
.article-detail {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.article-detail__header {
  padding: 32px 40px 24px;
  border-bottom: 1px solid var(--color-border);
}

.article-detail__title {
  font-size: clamp(1.375rem, 3vw, 1.875rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--color-primary);
  margin-top: 12px;
  margin-bottom: 16px;
}

.article-detail__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

.article-detail__date,
.article-detail__modified,
.article-detail__author {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-detail__eyecatch {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.article-detail__eyecatch img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-detail__body {
  padding: 40px;
}

.article-detail__footer {
  padding: 32px 40px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: flex-start;
  justify-content: space-between;
}

/* Entry Content Styles */
.entry-content {
  line-height: 1.9;
}

.entry-content h2 {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-top: 48px;
  margin-bottom: 20px;
  padding: 14px 20px;
  background: var(--color-bg);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.entry-content h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 36px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.entry-content h3::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--color-accent);
}

.entry-content h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 28px;
  margin-bottom: 12px;
}

.entry-content p {
  margin-bottom: 20px;
}

.entry-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--transition);
}

.entry-content a:hover {
  opacity: 0.8;
}

.entry-content ul,
.entry-content ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

.entry-content ul {
  list-style: disc;
}

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

.entry-content li {
  margin-bottom: 8px;
}

.entry-content blockquote {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--color-bg);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--color-text-light);
}

.entry-content img {
  border-radius: var(--radius-md);
  margin-block: 24px;
}

.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
  font-size: 0.9375rem;
}

.entry-content th,
.entry-content td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--color-border);
}

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

.entry-content tr:nth-child(even) td {
  background: rgba(247, 248, 250, 0.5);
}

.entry-content pre {
  background: var(--color-dark);
  color: #e8ecf0;
  padding: 24px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: 28px;
}

.entry-content code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  font-size: 0.9em;
}

.entry-content :not(pre) > code {
  background: var(--color-bg-light);
  color: #c0392b;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* Tags */
.tag-link {
  display: inline-block;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  margin: 4px 4px 4px 0;
  transition: border-color var(--transition), color var(--transition);
}

.tag-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Share Buttons */
.article-detail__share-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.share-buttons {
  display: flex;
  gap: 10px;
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--color-white);
  transition: opacity var(--transition), transform var(--transition);
}

.share-btn:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

.share-btn--twitter  { background: #000000; }
.share-btn--facebook { background: #1877f2; }
.share-btn--line     { background: #06c755; }

/* Post Navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding: 32px 40px;
  border-top: 1px solid var(--color-border);
}

.post-nav__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-light);
  margin-bottom: 6px;
  display: block;
}

.post-nav__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.5;
  transition: color var(--transition);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-nav__link:hover {
  color: var(--color-accent);
}

.post-nav__next {
  text-align: right;
}

/* Related Posts */
.related-posts {
  padding: 40px;
  border-top: 1px solid var(--color-border);
}

.related-posts__title {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.related-posts__title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--color-accent);
}

/* ============================================================
   Page Content (page.php)
============================================================ */
.page-content {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.page-content__eyecatch {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.page-content__eyecatch img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-content__body {
  padding: 40px;
}

/* ============================================================
   Pagination
============================================================ */
.pagination {
  margin-top: 40px;
}

.pagination__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.pagination__item a,
.pagination__item .current {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding-inline: 12px;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: background var(--transition), color var(--transition);
}

.pagination__item a {
  background: var(--color-white);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.pagination__item a:hover {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.pagination__item .current {
  background: var(--color-accent);
  color: var(--color-white);
  border: 1px solid var(--color-accent);
}

/* ============================================================
   No Posts
============================================================ */
.no-posts {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.no-posts p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

.no-posts .search-form {
  max-width: 480px;
  margin-inline: auto;
}

/* ============================================================
   404 Page
============================================================ */
.error-404 {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
}

.error-404__inner {
  text-align: center;
  max-width: 500px;
}

.error-404__code {
  font-size: clamp(5rem, 15vw, 9rem);
  font-weight: 900;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -0.04em;
}

.error-404__title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.error-404__desc {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

.error-404__search {
  margin-bottom: 32px;
}

.error-404__search-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.error-404__home-btn {
  font-size: 1rem;
  padding: 14px 36px;
}

/* ============================================================
   CTA Section
============================================================ */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  padding: 64px 0;
  margin-top: 60px;
}

.cta-section__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.cta-section__lead {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 8px;
}

.cta-section__title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.3;
}

.cta-section__buttons {
  flex-shrink: 0;
}

.cta-section .btn--primary {
  background: var(--color-accent);
  font-size: 1rem;
  padding: 14px 36px;
  box-shadow: 0 4px 20px rgba(0, 180, 160, 0.40);
}

/* ============================================================
   Site Footer
============================================================ */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.75);
}

.site-footer__top {
  padding: 60px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 48px;
  align-items: start;
}

.footer-logo__text {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-white);
}

.footer-logo__img {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
}

.site-footer__desc {
  margin-top: 12px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
  max-width: 300px;
}

.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-nav__list li a {
  display: block;
  padding: 8px 0;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: color var(--transition);
}

.footer-nav__list li a:hover {
  color: var(--color-accent);
}

.site-footer__bottom {
  padding: 20px 0;
}

.site-footer__copy {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
}

/* ============================================================
   Back to Top
============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 500;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
}

/* ============================================================
   WordPress Core Compatibility
============================================================ */
.wp-caption {
  max-width: 100%;
  margin-bottom: 20px;
}

.wp-caption-text {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  text-align: center;
  margin-top: 8px;
}

.aligncenter { display: block; margin-inline: auto; }
.alignleft   { float: left; margin: 0 24px 16px 0; }
.alignright  { float: right; margin: 0 0 16px 24px; }

/* ============================================================
   Responsive: Tablet (≤ 1024px)
============================================================ */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 260px;
    --content-gap: 28px;
  }

  .gnav,
  .search-toggle {
    display: none;
  }

  .hamburger {
    display: flex;
  }

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

  .fv-slider__track {
    padding-inline: calc(50% - 300px);
  }

  .fv-slider__item {
    flex: 0 0 600px;
    max-width: 600px;
  }

  .cta-section__inner {
    flex-direction: column;
    text-align: center;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   Responsive: Mobile (≤ 768px)
============================================================ */
@media (max-width: 768px) {
  :root {
    --container-pad: 16px;
    --header-height: 64px;
  }

  .main-wrap {
    grid-template-columns: 1fr;
    padding-top: 28px;
    padding-bottom: 48px;
  }

  .sidebar {
    position: static;
    top: unset;
  }

  .article-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .article-list--3col {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-card:hover {
    transform: none;
  }

  .article-card__img-box {
    aspect-ratio: 3 / 2;
    border-radius: 0;
  }

  .article-card__body {
    padding: 14px 16px 16px;
  }

  /* FV Slider mobile */
  .fv-slider__track {
    padding-inline: 16px;
    gap: 12px;
  }

  .fv-slider__item {
    flex: 0 0 calc(100vw - 64px);
    max-width: calc(100vw - 64px);
    opacity: 1;
    transform: scale(1);
  }

  .fv-slider__item:not(.is-active) {
    opacity: 0.6;
    transform: scale(0.95);
  }

  /* Article detail mobile */
  .article-detail__header {
    padding: 24px 20px 18px;
  }

  .article-detail__body {
    padding: 24px 20px;
  }

  .article-detail__footer {
    padding: 24px 20px;
    flex-direction: column;
  }

  .post-nav {
    padding: 24px 20px;
    grid-template-columns: 1fr;
  }

  .related-posts {
    padding: 24px 20px;
  }

  .page-content__body {
    padding: 24px 20px;
  }

  /* Section title mobile */
  .section-title {
    flex-direction: column;
    gap: 4px;
  }

  /* CTA */
  .cta-section {
    padding: 48px 0;
  }

  /* Footer */
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}

/* ============================================================
   Responsive: Small Mobile (≤ 480px)
============================================================ */
@media (max-width: 480px) {
  .article-list--3col {
    grid-template-columns: 1fr;
  }
}