/*
Theme Name:  AI News Theme
Theme URI:   https://aiupdate.blog
Description: Custom minimal editorial theme for AI News Updates
Author:      aiupdate
Version:     1.0.0
Text Domain: ainews
*/

/* =============================================
   CSS Variables
   ============================================= */
:root {
  --accent:       #1a6b8a;
  --accent-light: #e0f2f7;
  --text:         #1a1a1a;
  --text-muted:   #666;
  --text-faint:   #999;
  --border:       #e5e5e5;
  --bg:           #fff;
  --bg-sub:       #f7f8f9;
  --radius:       4px;
  --font-sans:    'Noto Sans JP', 'Helvetica Neue', Arial, sans-serif;
  --font-serif:   'Playfair Display', Georgia, serif;
  --max-width:    1100px;
  --content-width: 810px;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
}

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

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

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

/* =============================================
   Google Fonts
   ============================================= */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700&family=Noto+Sans+JP:wght@300;400;500&display=swap');

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

.content-area {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 3rem;
  align-items: start;
  padding: 2rem 0;
}

@media (max-width: 768px) {
  .content-area { grid-template-columns: 1fr; }
  .widget-area { border-top: 1px solid var(--border); padding-top: 2rem; }
}

/* =============================================
   Header
   ============================================= */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 0 0;
}

.site-branding {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 6px;
}

.custom-logo-link img {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 4px;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 400;
  line-height: 1.2;
}
.site-title a { color: var(--text); }
.site-title a:hover { text-decoration: none; color: var(--accent); }

.site-description {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* =============================================
   Navigation
   ============================================= */
.main-navigation {
  margin-top: 12px;
  border-top: 0.5px solid var(--border);
}

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

.main-navigation li a {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  padding: 10px 16px 10px 0;
  margin-right: 16px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.main-navigation li a:hover,
.main-navigation li.current-menu-item a {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

/* =============================================
   Post List (index.php)
   ============================================= */
.post-list { }

.post-card {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 0.5px solid var(--border);
  align-items: start;
}

.post-card:first-child { padding-top: 0; }

.post-card-thumbnail {
  width: 90px;
  height: 90px;
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-sub);
}

.post-card-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.post-card-thumbnail .no-thumbnail {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-sub);
  color: var(--text-faint);
  font-size: 11px;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 5px;
  flex-wrap: wrap;
}

.post-card-date {
  font-size: 11px;
  color: var(--text-faint);
}

.post-card-category a {
  display: inline-block;
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border: 0.5px solid var(--accent);
  color: var(--accent);
  border-radius: 2px;
}
.post-card-category a:hover { background: var(--accent); color: #fff; text-decoration: none; }

.post-card-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 5px;
}
.post-card-title a { color: var(--text); }
.post-card-title a:hover { color: var(--accent); text-decoration: none; }

.post-card-excerpt {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.65;
}

.post-card-more {
  display: inline-block;
  font-size: 11px;
  color: var(--accent);
  border: 0.5px solid var(--accent);
  padding: 3px 9px;
  border-radius: 2px;
  margin-top: 7px;
  transition: background 0.2s, color 0.2s;
}
.post-card-more:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* Pagination */
.pagination {
  display: flex;
  gap: 6px;
  padding: 2rem 0 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.pagination .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-size: 13px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: all 0.2s;
}
.pagination .page-numbers:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.pagination .page-numbers.current { background: var(--accent); color: #fff; border-color: var(--accent); }
.pagination .page-numbers.dots { border: none; width: auto; }

/* =============================================
   Breadcrumb
   ============================================= */
.breadcrumb {
  font-size: 11px;
  color: var(--text-faint);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}
.breadcrumb a { color: var(--text-faint); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb-sep { color: var(--border); }

/* =============================================
   Single Post
   ============================================= */
.single-post { }

.single-post-categories {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.single-post-categories a {
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border: 0.5px solid var(--accent);
  color: var(--accent);
  border-radius: 2px;
}
.single-post-categories a:hover { background: var(--accent); color: #fff; text-decoration: none; }

.single-post-title {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 14px;
}

.single-post-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 0;
  border-top: 0.5px solid var(--border);
  border-bottom: 0.5px solid var(--border);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.single-post-date { font-size: 12px; color: var(--text-faint); }

.single-post-author {
  display: flex;
  align-items: center;
  gap: 7px;
}
.single-post-author .avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  overflow: hidden;
}
.single-post-author .avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.single-post-author .name { font-size: 12px; color: var(--text-muted); }
.single-post-author .name a { color: var(--accent); }

.single-post-share {
  display: flex;
  gap: 6px;
  margin-left: auto;
}
.share-btn {
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border: 0.5px solid var(--border);
  border-radius: 2px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg);
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); }

.single-post-eyecatch {
  width: 100%;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 1.75rem;
  aspect-ratio: 16 / 7;
}
.single-post-eyecatch img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Article content */
.entry-content {
  font-size: 16px;
  line-height: 1.9;
}

.entry-content p { margin-bottom: 1.3em; }

.entry-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.entry-content h2 {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  margin: 2em 0 0.6em;
  padding-bottom: 7px;
  border-bottom: 1.5px solid var(--border);
}

.entry-content h3 {
  font-size: 16px;
  font-weight: 500;
  margin: 1.6em 0 0.5em;
  color: var(--text);
}

.entry-content ul, .entry-content ol {
  margin-bottom: 1.3em;
}

.entry-content li { margin-bottom: 0.3em; }

.entry-content blockquote {
  font-size: 14px;
  line-height: 1.8;
  padding: 14px 18px;
  background: var(--bg-sub);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  margin: 1.5em 0;
}

.entry-content img {
  border-radius: var(--radius);
  margin: 1.5em auto;
}

/* Lead paragraph */
.entry-content > p:first-of-type {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.85;
  padding: 14px 18px;
  background: var(--bg-sub);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  margin-bottom: 1.5em;
}

/* Post tags */
.single-post-tags {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 0.5px solid var(--border);
}

.single-post-tags a {
  font-size: 11px;
  color: var(--text-muted);
  border: 0.5px solid var(--border);
  padding: 3px 9px;
  border-radius: 2px;
  transition: all 0.2s;
}
.single-post-tags a::before { content: '# '; color: var(--accent); }
.single-post-tags a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* Post navigation */
.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 2rem;
}

.post-nav-item {
  padding: 14px 16px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}
.post-nav-item:hover { border-color: var(--accent); text-decoration: none; }
.post-nav-item.prev { text-align: left; }
.post-nav-item.next { text-align: right; }

.post-nav-direction {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 5px;
}

.post-nav-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  line-height: 1.45;
}

/* =============================================
   Custom Category Widget
   ============================================= */
.ainews-cat-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ainews-cat-item {
  border-bottom: 0.5px solid var(--border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.ainews-cat-link {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 7px 0;
  text-decoration: none;
  transition: color 0.2s;
  gap: 4px;
  min-width: 0;
}
.ainews-cat-item.has-children > .ainews-cat-link {
  cursor: pointer;
}
.ainews-cat-link:hover { color: var(--accent); text-decoration: none; }

.ainews-cat-count {
  font-size: 10px;
  color: var(--text-faint);
  font-weight: 400;
  white-space: nowrap;
  flex-shrink: 0;
}

.ainews-cat-arrow {
  font-size: 10px;
  color: var(--text-faint);
  flex-shrink: 0;
  transition: color 0.15s;
  margin-left: 2px;
}
.ainews-cat-item.has-children:hover .ainews-cat-arrow {
  color: var(--accent);
}

.ainews-cat-children {
  width: 100%;
  padding: 4px 0 6px 12px;
  border-left: 2px solid var(--accent-light);
  margin: 0 0 4px 2px;
}
.ainews-cat-children .ainews-cat-item {
  border-bottom: none;
}
.ainews-cat-children .ainews-cat-link {
  font-size: 11px;
  font-weight: 400;
  color: var(--accent);
  padding: 3px 0;
}
.ainews-cat-children .ainews-cat-link:hover { color: var(--text); }
.ainews-cat-children .ainews-cat-count { font-size: 10px; }

/* =============================================
   Sidebar & Widgets
   ============================================= */
.widget-area { }

.widget {
  margin-bottom: 2rem;
}

.widget-header {
  margin-bottom: 10px;
}

.widget-title {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
  border-bottom: 0.5px solid var(--border);
  padding-bottom: 6px;
}

/* Search widget */
.widget_search .search-form {
  display: flex;
  gap: 5px;
}

.widget_search .search-field {
  flex: 1;
  font-size: 12px;
  padding: 6px 10px;
  border: 0.5px solid var(--border);
  border-radius: 2px;
  background: var(--bg-sub);
  color: var(--text);
  font-family: var(--font-sans);
}
.widget_search .search-field:focus { outline: none; border-color: var(--accent); }

.widget_search .search-submit {
  font-size: 11px;
  padding: 6px 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-sans);
}
.widget_search .search-submit:hover { background: #155a76; }

/* Archives widget */
.widget_archive ul,
.widget_categories ul,
.widget_pages ul,
.widget_recent_entries ul,
.widget_nav_menu ul {
  list-style: none;
  padding: 0;
}

.widget_archive li,
.widget_recent_entries li {
  font-size: 12px;
  color: var(--accent);
  padding: 3px 0;
}

.widget_archive li a,
.widget_recent_entries li a {
  color: var(--accent);
}

/* Archive year grouping via CSS */
.ainews-archive { }

.ainews-archive-year {
  margin-bottom: 10px;
}

.ainews-archive-year-label {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-faint);
  letter-spacing: 0.1em;
  margin-bottom: 5px;
}

.ainews-archive-months {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.ainews-archive-months a {
  font-size: 11px;
  color: var(--accent);
  background: var(--bg-sub);
  padding: 2px 8px;
  border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}
.ainews-archive-months a:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* Categories widget - hierarchical */
.widget_categories ul {
  padding: 0;
}

.widget_categories li {
  border-bottom: 0.5px solid var(--border);
}

.widget_categories > ul > li > a {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 0;
}
.widget_categories > ul > li > a:hover { color: var(--accent); text-decoration: none; }

.widget_categories ul ul {
  padding-left: 10px;
  border-left: 1.5px solid rgba(26,107,138,0.15);
  margin: 4px 0 6px;
  width: 100%;
}

.widget_categories ul ul li {
  border: none;
  display: flex;
  align-items: center;
}

.widget_categories ul ul li a {
  font-size: 11px;
  color: var(--accent);
  padding: 3px 0;
  flex: 1;
}

.cat-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 11px;
  color: var(--text-faint);
  padding: 0 6px;
  line-height: 1;
  flex-shrink: 0;
  transition: color 0.15s;
}
.cat-toggle:hover { color: var(--accent); }

/* Author card in sidebar */
.sidebar-author-card {
  background: var(--bg-sub);
  border-radius: 6px;
  padding: 14px;
  border: 0.5px solid var(--border);
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.sidebar-author-card .avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}
.sidebar-author-card .avatar img { width: 100%; height: 100%; object-fit: cover; }

.sidebar-author-card .name {
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 3px;
}

.sidebar-author-card .bio {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* =============================================
   Contact Page
   ============================================= */
.contact-page {}

.contact-eyebrow {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.contact-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 400;
  margin-bottom: 8px;
}

.contact-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.75;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  margin-bottom: 2rem;
}

.contact-info-card {
  background: var(--bg-sub);
  border-radius: 6px;
  padding: 14px;
  border: 0.5px solid var(--border);
  margin-bottom: 2rem;
}

.contact-info-card .card-title {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 10px;
}

.contact-info-row {
  display: flex;
  gap: 10px;
  font-size: 12px;
  color: var(--text-muted);
  padding: 3px 0;
}

.contact-info-row span {
  color: var(--text-faint);
  min-width: 60px;
  flex-shrink: 0;
}

/* Contact Form 7 overrides */
.wpcf7-form p {
  margin-bottom: 1rem;
}

.wpcf7-form label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 5px;
}

.wpcf7-form .wpcf7-text,
.wpcf7-form .wpcf7-email,
.wpcf7-form .wpcf7-textarea,
.wpcf7-form input[type="text"],
.wpcf7-form input[type="email"],
.wpcf7-form textarea {
  width: 100%;
  font-size: 13px;
  padding: 9px 12px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-sub);
  color: var(--text);
  font-family: var(--font-sans);
  transition: border-color 0.2s, background 0.2s;
  box-sizing: border-box;
}

.wpcf7-form .wpcf7-text:focus,
.wpcf7-form .wpcf7-email:focus,
.wpcf7-form .wpcf7-textarea:focus,
.wpcf7-form input[type="text"]:focus,
.wpcf7-form input[type="email"]:focus,
.wpcf7-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg);
}

.wpcf7-form .wpcf7-textarea,
.wpcf7-form textarea {
  min-height: 140px;
  resize: vertical;
}

.wpcf7-form .wpcf7-submit,
.wpcf7-form input[type="submit"] {
  background: var(--accent);
  color: #fff;
  border: none;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-sans);
  padding: 10px 28px;
  border-radius: var(--radius);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background 0.2s;
}
.wpcf7-form .wpcf7-submit:hover,
.wpcf7-form input[type="submit"]:hover {
  background: #155a76;
}

/* 名前・メールを2カラムに */
@media (min-width: 600px) {
  .wpcf7-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 16px;
  }
  /* 3つ目以降のp（題名・本文・送信）はフル幅 */
  .wpcf7-form > p:nth-of-type(n+3) {
    grid-column: 1 / -1;
  }
}

/* エラー・成功メッセージ */
.wpcf7-not-valid-tip {
  font-size: 11px;
  color: #c0392b;
  margin-top: 3px;
  display: block;
}
.wpcf7-response-output {
  font-size: 13px;
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-top: 1rem;
  border: 0.5px solid var(--border);
}
.wpcf7-mail-sent-ok {
  background: #d4edda;
  border-color: #28a745;
  color: #1a5c2a;
}
.wpcf7-mail-sent-ng,
.wpcf7-aborted {
  background: #fde8e8;
  border-color: #c0392b;
  color: #a32d2d;
}

/* =============================================
   Footer
   ============================================= */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  margin-top: 3rem;
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
}

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

/* =============================================
   Utility
   ============================================= */
.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
}

.clearfix::after { content: ''; display: table; clear: both; }

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 600px) {
  .post-card { grid-template-columns: 72px 1fr; }
  .post-card-thumbnail { width: 72px; height: 72px; }
  .single-post-title { font-size: 20px; }
  .post-navigation { grid-template-columns: 1fr; }
  .single-post-share { display: none; }
}