/*
Theme Name: Digital Book Guide
Theme URI: https://example.com/
Author: Digital Book Guide
Description: 漫画・デジタル写真集紹介サイト向けの軽量テーマ。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.8
Requires PHP: 7.4
Text Domain: digital-book-guide
*/
:root {
  --dbg-ink: #17283d;
  --dbg-text: #273445;
  --dbg-muted: #64748b;
  --dbg-line: #e2e8f0;
  --dbg-bg: #f6f8fb;
  --dbg-card: #ffffff;
  --dbg-accent: #c62828;
  --dbg-accent-hover: #a91f1f;
  --dbg-radius: 16px;
  --dbg-width: 1120px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--dbg-text);
  background: var(--dbg-bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.8;
  overflow-wrap: anywhere;
}
img { max-width: 100%; height: auto; }
a { color: var(--dbg-ink); text-underline-offset: .18em; }
a:hover { color: var(--dbg-accent); }
button, input { font: inherit; }
.container { width: min(var(--dbg-width), calc(100% - 36px)); margin-inline: auto; }
.site-header { background: var(--dbg-ink); color: #fff; }
.header-inner { display:flex; align-items:center; justify-content:space-between; gap:24px; padding:18px 0; }
.site-brand { color:#fff; text-decoration:none; display:block; font-weight:800; letter-spacing:.04em; font-size:1.35rem; line-height:1.25; }
.site-tagline { margin:6px 0 0; color:#d7e0eb; font-size:.78rem; }
.site-nav ul { display:flex; flex-wrap:wrap; gap:10px 20px; margin:0; padding:0; list-style:none; }
.site-nav a { color:#fff; text-decoration:none; font-size:.92rem; }
.site-nav a:hover { color:#f9d4d4; }
.menu-toggle { display:none; color:#fff; border:1px solid #617187; background:transparent; border-radius:8px; padding:7px 10px; }
.hero { background:linear-gradient(135deg, #17283d, #314b68); color:#fff; padding:52px 0 48px; }
.hero h1 { margin:0; max-width:760px; font-size:clamp(2rem, 5vw, 3.3rem); line-height:1.2; letter-spacing:.02em; }
.hero p { color:#e0e8f1; max-width:650px; margin:18px 0 0; }
.hero-links { display:flex; flex-wrap:wrap; gap:12px; margin-top:24px; }
.hero-link { display:inline-flex; justify-content:center; align-items:center; padding:10px 16px; border-radius:10px; background:#fff; color:var(--dbg-ink); text-decoration:none; font-weight:700; }
.hero-link:hover { color:var(--dbg-accent); }
.search-form { display:flex; gap:8px; margin-top:24px; max-width:620px; }
.search-form input[type="search"] { min-width:0; flex:1; padding:12px 14px; border:1px solid #cbd5e1; border-radius:10px; background:#fff; }
.search-form button { border:0; border-radius:10px; background:var(--dbg-accent); color:#fff; padding:10px 18px; font-weight:700; cursor:pointer; }
.section { padding:38px 0; }
.section-head { display:flex; justify-content:space-between; align-items:end; gap:16px; margin-bottom:18px; }
.section-head h2 { margin:0; color:var(--dbg-ink); font-size:clamp(1.35rem, 3vw, 1.8rem); line-height:1.35; }
.section-head p { margin:5px 0 0; color:var(--dbg-muted); font-size:.92rem; }
.text-link { font-weight:700; font-size:.92rem; white-space:nowrap; }
.card-grid { display:grid; grid-template-columns:repeat(4, minmax(0, 1fr)); gap:18px; }
.content-card { min-width:0; background:var(--dbg-card); border:1px solid var(--dbg-line); border-radius:var(--dbg-radius); overflow:hidden; box-shadow:0 4px 16px rgba(23,40,61,.035); }
.card-image { display:block; aspect-ratio:3/4; background:#e8edf3; overflow:hidden; }
.card-image img { display:block; width:100%; height:100%; object-fit:cover; transition:transform .25s ease; }
.content-card:hover .card-image img { transform:scale(1.025); }
.image-placeholder { display:flex; width:100%; height:100%; min-height:180px; align-items:center; justify-content:center; color:#617187; font-size:2.2rem; background:linear-gradient(145deg,#e6ebf0,#f5e9e3); }
.card-body { padding:14px; }
.card-meta { color:var(--dbg-muted); font-size:.78rem; margin:0 0 6px; }
.card-title { margin:0; font-size:1rem; line-height:1.55; }
.card-title a { text-decoration:none; }
.card-excerpt { margin:8px 0 0; font-size:.88rem; color:#526174; }
.category-pills { display:flex; flex-wrap:wrap; gap:8px; }
.pill { display:inline-block; border:1px solid var(--dbg-line); border-radius:999px; padding:6px 12px; text-decoration:none; background:#fff; font-size:.88rem; }
.main-layout { display:grid; grid-template-columns:minmax(0, 1fr) 280px; gap:30px; align-items:start; }
.article, .sidebar-box, .page-panel { background:#fff; border:1px solid var(--dbg-line); border-radius:var(--dbg-radius); }
.article { padding:clamp(18px, 4vw, 42px); min-width:0; }
.breadcrumbs { font-size:.8rem; color:var(--dbg-muted); margin-bottom:14px; }
.breadcrumbs a { color:var(--dbg-muted); }
.pr-label { display:inline-block; color:#8a1c1c; background:#fff0f0; border:1px solid #f2caca; border-radius:5px; padding:1px 7px; font-size:.75rem; font-weight:800; letter-spacing:.04em; }
.article-title { color:var(--dbg-ink); font-size:clamp(1.7rem, 4vw, 2.45rem); line-height:1.4; margin:12px 0; }
.article-meta { color:var(--dbg-muted); font-size:.82rem; }
.article-lead { font-size:1.05rem; background:#f7f9fc; border-left:4px solid #9aaabd; padding:16px 18px; margin:22px 0; }
.article-cover { text-align:center; margin:24px auto; }
.article-cover img { max-height:620px; width:auto; border-radius:8px; box-shadow:0 5px 22px rgba(23,40,61,.12); }
.article-content > * + * { margin-top:1.1em; }
.article-content h2 { margin-top:2em; color:var(--dbg-ink); font-size:1.45rem; line-height:1.45; border-bottom:2px solid var(--dbg-line); padding-bottom:.4em; }
.article-content h3 { color:var(--dbg-ink); font-size:1.15rem; }
.article-content table, .info-table { width:100%; border-collapse:collapse; font-size:.93rem; }
.article-content th, .article-content td, .info-table th, .info-table td { border:1px solid var(--dbg-line); padding:10px 12px; text-align:left; vertical-align:top; }
.article-content th, .info-table th { background:#f4f7fa; width:30%; }
.article-content blockquote { margin-inline:0; padding:12px 18px; border-left:4px solid #cbd5e1; background:#f8fafc; }
.cta-box { margin:28px 0; padding:22px; border:1px solid #f0caca; border-radius:14px; background:#fff8f8; text-align:center; }
.cta-box p { margin:0 0 12px; }
.cta-button { display:inline-flex; align-items:center; justify-content:center; gap:8px; background:var(--dbg-accent); color:#fff !important; padding:12px 22px; border-radius:9px; font-weight:800; text-decoration:none; line-height:1.5; }
.cta-button:hover { background:var(--dbg-accent-hover); }
.cta-note { display:block; margin-top:8px; color:var(--dbg-muted); font-size:.76rem; }
.article-disclosure { margin-top:34px; padding-top:16px; border-top:1px solid var(--dbg-line); color:var(--dbg-muted); font-size:.78rem; }
.related-posts { margin-top:30px; }
.related-posts h2 { font-size:1.2rem; color:var(--dbg-ink); }
.sidebar-box { padding:18px; margin-bottom:18px; }
.sidebar-box h2 { margin:0 0 10px; font-size:1.05rem; color:var(--dbg-ink); }
.sidebar-box ul { margin:0; padding-left:1.2em; }
.sidebar-box li + li { margin-top:8px; }
.page-panel { padding:clamp(18px, 4vw, 38px); }
.archive-intro { margin-bottom:24px; }
.archive-intro h1 { color:var(--dbg-ink); margin:0 0 8px; font-size:clamp(1.8rem,4vw,2.5rem); }
.pagination { margin-top:28px; }
.pagination .nav-links { display:flex; flex-wrap:wrap; gap:8px; }
.pagination a, .pagination span { padding:8px 12px; border:1px solid var(--dbg-line); background:#fff; border-radius:8px; text-decoration:none; }
.pagination .current { background:var(--dbg-ink); color:#fff; }
.site-footer { margin-top:30px; padding:30px 0; background:var(--dbg-ink); color:#d7e0eb; font-size:.85rem; }
.footer-inner { display:flex; flex-wrap:wrap; justify-content:space-between; gap:18px; }
.footer-links { display:flex; flex-wrap:wrap; gap:12px 18px; }
.site-footer a { color:#fff; }
.empty-state { padding:24px; background:#fff; border:1px dashed #cbd5e1; border-radius:12px; color:var(--dbg-muted); }
.screen-reader-text { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
@media (max-width: 900px) {
  .card-grid { grid-template-columns:repeat(3, minmax(0, 1fr)); }
  .main-layout { grid-template-columns:minmax(0, 1fr) 240px; gap:18px; }
  .header-inner { align-items:flex-start; }
}
@media (max-width: 700px) {
  .container { width:min(100% - 24px, var(--dbg-width)); }
  .header-inner { flex-wrap:wrap; gap:12px; padding:14px 0; }
  .brand-wrap { flex:1; }
  .menu-toggle { display:inline-block; }
  .site-nav { display:none; width:100%; }
  .site-nav.is-open { display:block; }
  .site-nav ul { display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:0; }
  .site-nav li { border-top:1px solid #40536a; }
  .site-nav a { display:block; padding:10px 4px; }
  .hero { padding:36px 0 32px; }
  .hero p { font-size:.94rem; }
  .search-form { gap:6px; }
  .search-form button { padding-inline:12px; }
  .section { padding:28px 0; }
  .card-grid { grid-template-columns:repeat(2, minmax(0, 1fr)); gap:12px; }
  .card-body { padding:11px; }
  .card-title { font-size:.92rem; }
  .card-excerpt { font-size:.82rem; }
  .main-layout { grid-template-columns:1fr; }
  .sidebar { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; }
  .sidebar-box { margin:0; }
  .article { padding:18px 15px; }
  .article-lead { font-size:.98rem; padding:13px; }
  .article-content table { font-size:.85rem; }
  .article-content th, .article-content td { padding:8px; }
}
@media (max-width: 420px) {
  .sidebar { grid-template-columns:1fr; }
  .hero-links { display:grid; grid-template-columns:1fr 1fr; }
  .hero-link { padding:10px 8px; font-size:.88rem; }
  .cta-button { width:100%; }
}