/*
Theme Name: 68Blog
Theme URI: http://68works.jp
Author: 68works
Description: シンプルで読みやすい、AdSense対応ブログテーマ
Version: 1.2.0
License: GNU General Public License v2 or later
Text Domain: 68blog
*/

/* =====================
   リセット・変数
   ===================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary:       #1a6fbf;
  --color-primary-dark:  #145299;
  --color-primary-light: #e8f1fb;
  --color-accent:        #f0a500;
  --color-text:          #333333;
  --color-text-sub:      #666666;
  --color-border:        #e0e0e0;
  --color-bg:            #f5f7fa;
  --color-white:         #ffffff;
  --font-base: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --max-width: 1200px;
  --radius: 4px;
  --shadow: 0 2px 8px rgba(0,0,0,.06);
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.8;
}

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

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { padding-left: 1.5em; }

/* =====================
   ヘッダー（固定）
   ===================== */
.site-header {
  background: var(--color-white);
  border-bottom: 3px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
}

.site-branding a {
  text-decoration: none;
  display: flex;
  align-items: center;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: .02em;
}

/* ナビゲーション */
.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav ul {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 0;
}

.site-nav li a {
  display: block;
  color: var(--color-text);
  padding: 8px 20px;
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .02em;
  text-transform: uppercase;
  border-bottom: 3px solid transparent;
  transition: color .2s, border-color .2s;
  text-decoration: none;
}

.site-nav li a:hover,
.site-nav li.current-menu-item a {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

.site-nav li a .sub-label {
  display: block;
  font-size: .7rem;
  font-weight: 400;
  color: var(--color-text-sub);
  text-transform: none;
  letter-spacing: 0;
}

/* =====================
   ドロップダウン（サブメニュー）
   親カテゴリのみ横並び、子カテゴリはホバーで開くドロップダウンに
   ===================== */
.site-nav .menu-item-has-children { position: relative; }

/* 子を持つ親項目に ▼ マーク */
.site-nav .menu-item-has-children > a::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  vertical-align: middle;
  opacity: .6;
}

/* サブメニュー本体（初期は非表示） */
.site-nav .sub-menu {
  display: block;                 /* 親ulのflexを解除して縦積みに */
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  box-shadow: 0 6px 18px rgba(0,0,0,.1);
  padding: 6px 0;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity .2s, transform .2s, visibility .2s;
  z-index: 1001;
}

/* ホバー・フォーカスで表示 */
.site-nav .menu-item-has-children:hover > .sub-menu,
.site-nav .menu-item-has-children:focus-within > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* サブメニュー内の各項目 */
.site-nav .sub-menu li { width: 100%; }
.site-nav .sub-menu li a {
  padding: 10px 20px;
  font-size: .85rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  border-bottom: none;
  white-space: nowrap;
}
.site-nav .sub-menu li a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-bottom-color: transparent;
}

/* ヘッダー内検索 */
.nav-search {
  margin-left: 12px;
}
.nav-search .search-form {
  display: flex;
  gap: 0;
}
.nav-search .search-field {
  border: 1px solid var(--color-border);
  border-right: none;
  border-radius: var(--radius) 0 0 var(--radius);
  padding: 6px 12px;
  font-size: .85rem;
  font-family: var(--font-base);
  width: 180px;
  transition: border-color .2s;
}
.nav-search .search-field:focus {
  outline: none;
  border-color: var(--color-primary);
}
.nav-search .search-submit {
  background: var(--color-primary);
  color: var(--color-white);
  border: 1px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 6px 14px;
  cursor: pointer;
  font-size: .85rem;
  font-family: var(--font-base);
  transition: background .2s;
}
.nav-search .search-submit:hover { background: var(--color-primary-dark); }

/* ハンバーガー */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}
.menu-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform .3s, opacity .3s;
}

/* =====================
   キービジュアル
   ===================== */
.hero {
  position: relative;
  height: 480px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-default {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.3);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-default .hero-overlay {
  background: none;
}

.hero-content {
  text-align: center;
  color: var(--color-white);
  padding: 24px;
}

.hero-title {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 12px;
  text-shadow: 0 2px 8px rgba(0,0,0,.3);
}

.hero-subtitle {
  font-size: 1.1rem;
  opacity: .9;
  margin-bottom: 24px;
  text-shadow: 0 1px 4px rgba(0,0,0,.3);
}

.hero-btn {
  display: inline-block;
  border: 2px solid var(--color-white);
  color: var(--color-white);
  padding: 12px 36px;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .05em;
  transition: background .3s, color .3s;
}
.hero-btn:hover {
  background: var(--color-white);
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* =====================
   コンテナ
   ===================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.main-content {
  padding: 48px 0 60px;
}

/* =====================
   記事グリッド（4列）
   ===================== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.post-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: box-shadow .2s;
}
.post-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,.1);
}

.post-card-thumbnail {
  display: block;
  overflow: hidden;
  aspect-ratio: 3 / 2;
}
.post-card-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s;
}
.post-card:hover .post-card-thumbnail img {
  transform: scale(1.03);
}

.post-card-body {
  padding: 20px;
}

.post-card-title {
  font-size: .95rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
}
.post-card-title a { color: var(--color-text); }
.post-card-title a:hover { color: var(--color-primary); text-decoration: none; }

.post-card-excerpt {
  font-size: .85rem;
  color: var(--color-text-sub);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 14px;
}

.post-card-more {
  display: inline-block;
  font-size: .8rem;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  padding: 5px 18px;
  transition: color .2s, border-color .2s;
}
.post-card-more:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}

/* 記事メタ */
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.post-card-date {
  font-size: .8rem;
  color: var(--color-text-sub);
}
.post-card-category a {
  font-size: .75rem;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 600;
}
.post-card-category a:hover {
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
}

/* =====================
   記事本文（single）
   ===================== */
.single-layout {
  max-width: 780px;
  margin: 0 auto;
}

.post-single {
  background: var(--color-white);
  padding: 40px 0;
}

.post-header { margin-bottom: 32px; }
.post-header .post-card-meta { margin-bottom: 14px; }
.post-header h1 {
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--color-text);
}

.post-thumbnail {
  margin-bottom: 32px;
  overflow: hidden;
}
.post-thumbnail img { width: 100%; }

/* PR表記（ステマ規制対応・全記事に表示） */
.pr-disclosure {
  font-size: .8rem;
  color: var(--color-text-sub);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 8px 14px;
  margin-bottom: 28px;
  line-height: 1.5;
}

/* 本文 */
.entry-content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  border-left: 4px solid var(--color-primary);
  padding-left: 12px;
  margin: 2em 0 1em;
}
.entry-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 6px;
  margin: 1.8em 0 .8em;
}
.entry-content h4, .entry-content h5, .entry-content h6 {
  font-weight: 700;
  margin: 1.5em 0 .6em;
}
.entry-content p { margin-bottom: 1.4em; }
.entry-content ul, .entry-content ol { margin-bottom: 1.4em; }
.entry-content li { margin-bottom: .4em; }
.entry-content blockquote {
  border-left: 4px solid var(--color-border);
  background: var(--color-bg);
  padding: 16px 20px;
  margin: 1.5em 0;
  color: var(--color-text-sub);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.entry-content pre {
  background: #1e2a3a;
  color: #e8eaf0;
  padding: 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: .9rem;
  margin-bottom: 1.4em;
}
.entry-content code {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: .9em;
}
.entry-content pre code { background: none; color: inherit; padding: 0; }
.entry-content img { margin: 1em 0; }
.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.4em;
  font-size: .9rem;
}
.entry-content th, .entry-content td {
  border: 1px solid var(--color-border);
  padding: 10px 14px;
}
.entry-content th {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-weight: 700;
}
.entry-content tr:nth-child(even) td { background: var(--color-bg); }

/* タグ */
.post-tags {
  margin-top: 24px;
  font-size: .875rem;
}
.tags-label { color: var(--color-text-sub); }

/* 著者 */
.post-author-box {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 40px;
}
.post-author-avatar img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
}
.post-author-name {
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-primary-dark);
}
.post-author-bio { font-size: .9rem; color: var(--color-text-sub); }

/* 前後ナビ */
.post-nav {
  display: flex;
  gap: 16px;
  margin-top: 32px;
}
.post-nav-prev, .post-nav-next {
  flex: 1;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 16px 20px;
  font-size: .9rem;
  transition: border-color .2s;
}
.post-nav-prev:hover, .post-nav-next:hover {
  border-color: var(--color-primary);
  text-decoration: none;
}
.post-nav-label {
  font-size: .75rem;
  color: var(--color-text-sub);
  display: block;
  margin-bottom: 4px;
}
.post-nav-title { color: var(--color-text); font-weight: 600; }
.post-nav-next { text-align: right; }

/* =====================
   ページネーション
   ===================== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  font-size: .9rem;
  background: var(--color-white);
  color: var(--color-text);
  transition: all .2s;
}
.pagination a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}
.pagination .current {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* =====================
   アーカイブ・検索ヘッダー
   ===================== */
.archive-header {
  border-left: 4px solid var(--color-primary);
  padding: 16px 20px;
  margin-bottom: 32px;
  background: var(--color-bg);
}
.archive-header h1 {
  font-size: 1.2rem;
  color: var(--color-primary-dark);
}
.archive-header p {
  font-size: .875rem;
  color: var(--color-text-sub);
  margin-top: 4px;
}

.search-header {
  background: var(--color-bg);
  padding: 24px;
  margin-bottom: 32px;
}
.search-header h1 { font-size: 1.2rem; }
.search-keyword { color: var(--color-primary); font-weight: 700; }
.search-count {
  font-size: .875rem;
  color: var(--color-text-sub);
  margin-top: 6px;
}

/* 検索フォーム（共通） */
.search-form {
  display: flex;
  gap: 8px;
}
.search-field {
  flex: 1;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: .9rem;
  font-family: var(--font-base);
  transition: border-color .2s;
  min-width: 0;
}
.search-field:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26,111,191,.1);
}
.search-submit {
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius);
  padding: 10px 18px;
  cursor: pointer;
  font-size: .9rem;
  font-family: var(--font-base);
  transition: background .2s;
  white-space: nowrap;
}
.search-submit:hover { background: var(--color-primary-dark); }

/* =====================
   404ページ
   ===================== */
.error-404 {
  padding: 80px 40px;
  text-align: center;
}
.error-404-code {
  font-size: 6rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.error-404 h1 { font-size: 1.4rem; margin: 16px 0 12px; }
.error-404 p { color: var(--color-text-sub); margin-bottom: 24px; }
.btn-home {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 28px;
  font-weight: 600;
  transition: background .2s;
}
.btn-home:hover { background: var(--color-primary-dark); text-decoration: none; }

/* No posts */
.no-posts {
  text-align: center;
  padding: 60px 24px;
  color: var(--color-text-sub);
}
.no-posts p { margin-bottom: 16px; }

/* =====================
   AdSense
   ===================== */
.ad-banner {
  margin: 24px 0;
  text-align: center;
  background: var(--color-bg);
  border: 1px dashed var(--color-border);
  padding: 12px;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-sub);
  font-size: .8rem;
}

/* =====================
   フッター
   ===================== */
.site-footer {
  background: #2a2a2a;
  color: rgba(255,255,255,.8);
  padding: 48px 0 24px;
  margin-top: 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-widget-title {
  color: var(--color-white);
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,.2);
}

.footer-widget ul { list-style: none; padding: 0; }
.footer-widget li { margin-bottom: 8px; }
.footer-widget a {
  color: rgba(255,255,255,.75);
  font-size: .875rem;
  transition: color .2s;
}
.footer-widget a:hover { color: var(--color-white); text-decoration: none; }

.footer-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav li { margin-bottom: 8px; }

.footer-nav a {
  color: rgba(255,255,255,.75);
  font-size: .875rem;
  text-decoration: none;
  transition: color .2s;
}

.footer-nav a:hover { color: var(--color-white); text-decoration: underline; }

.footer-affiliate {
  font-size: .75rem;
  color: rgba(255,255,255,.45);
  margin-bottom: 10px;
  line-height: 1.6;
}

.footer-bottom {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.15);
  font-size: .8rem;
  color: rgba(255,255,255,.5);
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* =====================
   レスポンシブ
   ===================== */
@media (max-width: 1024px) {
  .post-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0; right: 0;
    background: var(--color-white);
    border-bottom: 3px solid var(--color-primary);
    flex-direction: column;
    padding: 16px 0;
    box-shadow: 0 4px 12px rgba(0,0,0,.1);
    z-index: 999;
  }
  .site-nav.is-open {
    display: flex;
  }
  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }
  .site-nav li a {
    padding: 12px 24px;
    border-bottom: none;
  }

  /* モバイルではサブメニューをインデント付きの通常リスト表示に */
  .site-nav .sub-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    min-width: 0;
    border: none;
    border-top: none;
    box-shadow: none;
    padding: 0;
    background: var(--color-bg);
  }
  .site-nav .sub-menu li a {
    padding: 10px 24px 10px 44px;   /* 左を深めにインデント */
  }
  /* モバイルではキャレット非表示（常時展開のため） */
  .site-nav .menu-item-has-children > a::after {
    display: none;
  }

  .nav-search {
    margin: 12px 24px 0;
  }
  .nav-search .search-field { width: 100%; }

  .menu-toggle { display: flex; }

  .post-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .hero { height: 320px; }
  .hero-title { font-size: 1.6rem; }
  .hero-subtitle { font-size: .95rem; }

  .post-single { padding: 24px 0; }
  .post-header h1 { font-size: 1.3rem; }
  .post-nav { flex-direction: column; }
}

@media (max-width: 480px) {
  .post-grid {
    grid-template-columns: 1fr;
  }
  .post-card-body { padding: 16px; }
  .hero { height: 240px; }
  .hero-title { font-size: 1.3rem; }
}