/*
Theme Name: Atto Lite
Theme URI: https://www.atto-hiro.com/
Author: ChatGPT
Description: Cocoonからの移行を想定した、雑記ブログ向けの軽量WordPressテーマ。投稿カード、サイドバー、パンくず、関連記事、シェア、目次、広告ウィジェットに対応。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.5
Requires PHP: 7.4
License: GPL-2.0-or-later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: atto-lite
Tags: blog, one-column, two-columns, right-sidebar, custom-menu, featured-images
*/

:root{
  --atto-bg:#f6f7f8;
  --atto-surface:#fff;
  --atto-text:#1f2937;
  --atto-muted:#6b7280;
  --atto-border:#e5e7eb;
  --atto-accent:#2563eb;
  --atto-accent-soft:#eff6ff;
  --atto-radius:18px;
  --atto-shadow:0 10px 28px rgba(15,23,42,.06);
  --atto-container:1120px;
  --atto-content:740px;
  --atto-sidebar:320px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--atto-bg);
  color:var(--atto-text);
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  letter-spacing:.02em;
  word-break:break-word;
}
a{color:var(--atto-accent);text-decoration:none;text-underline-offset:.2em}
a:hover{text-decoration:underline}
img,video,iframe{max-width:100%;height:auto}
img{vertical-align:middle}
figure{margin:1.8em 0}
figcaption{color:var(--atto-muted);font-size:.88rem;text-align:center;margin-top:.45em}
pre,code,kbd,samp{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
pre{overflow:auto;background:#111827;color:#f9fafb;padding:1rem;border-radius:12px;line-height:1.65}
blockquote{margin:1.8em 0;padding:1rem 1.2rem;border-left:4px solid var(--atto-accent);background:var(--atto-accent-soft);border-radius:0 12px 12px 0;color:#374151}
table{width:100%;border-collapse:collapse;margin:1.6em 0;background:var(--atto-surface)}
th,td{border:1px solid var(--atto-border);padding:.7rem;vertical-align:top}
th{background:#f3f4f6}
.screen-reader-text{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link:focus{position:fixed;left:1rem;top:1rem;width:auto;height:auto;clip:auto;background:#111827;color:#fff;padding:.6rem 1rem;border-radius:10px;z-index:9999}

.atto-site-header{background:rgba(255,255,255,.92);border-bottom:1px solid var(--atto-border);position:sticky;top:0;z-index:50;backdrop-filter:saturate(160%) blur(10px)}
.admin-bar .atto-site-header{top:32px}
.atto-container{max-width:var(--atto-container);margin:0 auto;padding:0 20px}
.atto-header-inner{display:flex;align-items:center;gap:20px;min-height:72px}
.atto-brand{display:flex;align-items:center;gap:12px;min-width:0;margin-right:auto}
.atto-logo img{max-height:48px;width:auto}
.atto-site-title{font-weight:800;font-size:1.25rem;line-height:1.2;color:var(--atto-text);text-decoration:none}
.atto-site-desc{color:var(--atto-muted);font-size:.82rem;line-height:1.35;margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:420px}
.atto-menu-toggle{display:none;border:1px solid var(--atto-border);background:var(--atto-surface);border-radius:12px;padding:.5rem .7rem;color:var(--atto-text)}
.atto-nav ul{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
.atto-nav a{display:block;color:var(--atto-text);font-weight:700;font-size:.92rem;padding:.55rem .8rem;border-radius:999px;text-decoration:none}
.atto-nav a:hover,.atto-nav .current-menu-item>a{background:var(--atto-accent-soft);color:var(--atto-accent)}

.atto-main{padding:28px 0 48px}
.atto-layout{display:grid;grid-template-columns:minmax(0,1fr) var(--atto-sidebar);gap:28px;align-items:start}
.atto-no-sidebar .atto-layout{grid-template-columns:minmax(0,var(--atto-content));justify-content:center}
.atto-content-area{min-width:0}
.atto-sidebar{min-width:0}

.atto-hero{background:linear-gradient(135deg,var(--atto-surface),var(--atto-accent-soft));border:1px solid var(--atto-border);border-radius:var(--atto-radius);padding:26px;margin-bottom:22px;box-shadow:var(--atto-shadow)}
.atto-hero h1{font-size:clamp(1.45rem,3.2vw,2.15rem);line-height:1.35;margin:.1em 0 .35em}
.atto-hero p{margin:0;color:#4b5563}

.atto-section-title{font-size:1.15rem;margin:0 0 14px;display:flex;align-items:center;gap:.55rem}
.atto-section-title:before{content:"";width:.55rem;height:.55rem;border-radius:50%;background:var(--atto-accent);display:inline-block}
.atto-post-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.atto-card{background:var(--atto-surface);border:1px solid var(--atto-border);border-radius:var(--atto-radius);overflow:hidden;box-shadow:var(--atto-shadow);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.atto-card:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(15,23,42,.09);border-color:#d1d5db}
.atto-card-thumb{display:block;aspect-ratio:16/9;background:#e5e7eb;overflow:hidden}
.atto-card-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.atto-card:hover .atto-card-thumb img{transform:scale(1.03)}
.atto-card-body{padding:15px 16px 17px}
.atto-card-title{font-size:1.02rem;line-height:1.55;margin:0 0 .45rem}
.atto-card-title a{color:var(--atto-text);text-decoration:none}
.atto-card-excerpt{color:#4b5563;font-size:.9rem;line-height:1.7;margin:.45rem 0 0}
.atto-meta{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem .7rem;color:var(--atto-muted);font-size:.82rem;margin:.2rem 0 .55rem}
.atto-meta a{color:var(--atto-muted)}
.atto-cat{display:inline-flex;align-items:center;background:var(--atto-accent-soft);color:var(--atto-accent)!important;border-radius:999px;padding:.12rem .55rem;font-size:.78rem;font-weight:700;text-decoration:none!important}
.atto-pagination{margin:26px 0 0;text-align:center}
.atto-pagination .page-numbers{display:inline-flex;align-items:center;justify-content:center;min-width:2.3rem;height:2.3rem;margin:.15rem;border:1px solid var(--atto-border);background:var(--atto-surface);border-radius:999px;color:var(--atto-text);font-weight:700;text-decoration:none}
.atto-pagination .current,.atto-pagination a:hover{background:var(--atto-accent);border-color:var(--atto-accent);color:#fff}

.atto-widget{background:var(--atto-surface);border:1px solid var(--atto-border);border-radius:var(--atto-radius);padding:18px;margin-bottom:18px;box-shadow:var(--atto-shadow)}
.atto-widget-title{font-size:1rem;margin:0 0 12px;padding-bottom:9px;border-bottom:1px solid var(--atto-border)}
.atto-widget ul{list-style:none;padding:0;margin:0}
.atto-widget li{border-bottom:1px dashed var(--atto-border);padding:.55rem 0}
.atto-widget li:last-child{border-bottom:0}
.atto-widget a{color:var(--atto-text)}
.atto-widget .tagcloud a{display:inline-block;border:1px solid var(--atto-border);border-radius:999px;padding:.16rem .55rem;margin:.15rem;color:#374151;font-size:.84rem!important;text-decoration:none;background:#fafafa}
.search-form{display:flex;gap:.45rem}
.search-field{width:100%;border:1px solid var(--atto-border);border-radius:12px;padding:.65rem .75rem;background:#fff;color:var(--atto-text)}
.search-submit,.atto-btn{border:0;border-radius:12px;background:var(--atto-accent);color:#fff;font-weight:800;padding:.65rem .85rem;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:.35rem}
.search-submit:hover,.atto-btn:hover{filter:brightness(.94);text-decoration:none}

.atto-article{background:var(--atto-surface);border:1px solid var(--atto-border);border-radius:var(--atto-radius);box-shadow:var(--atto-shadow);padding:clamp(20px,4vw,38px)}
.atto-breadcrumb{font-size:.82rem;color:var(--atto-muted);margin:0 0 16px}
.atto-breadcrumb a{color:var(--atto-muted)}
.atto-entry-title{font-size:clamp(1.6rem,4vw,2.25rem);line-height:1.35;margin:.1rem 0 .65rem;letter-spacing:.01em}
.atto-eyecatch{margin:1.2rem 0 1.4rem;border-radius:16px;overflow:hidden;background:#e5e7eb}
.atto-eyecatch img{width:100%;height:auto}
.atto-content{font-size:1.02rem}
.atto-content h2{font-size:1.55rem;line-height:1.45;margin:2.25em 0 .85em;padding:.35rem 0 .55rem;border-bottom:3px solid var(--atto-border);position:relative}
.atto-content h2:after{content:"";position:absolute;left:0;bottom:-3px;width:4.8rem;height:3px;background:var(--atto-accent)}
.atto-content h3{font-size:1.25rem;line-height:1.5;margin:1.9em 0 .7em;padding-left:.75rem;border-left:4px solid var(--atto-accent)}
.atto-content h4{font-size:1.08rem;margin:1.6em 0 .65em}
.atto-content p{margin:1.05em 0}
.atto-content ul,.atto-content ol{padding-left:1.45em;margin:1.1em 0}
.atto-content li{margin:.35em 0}
.atto-content .alignwide{margin-left:calc(50% - min(50vw, var(--atto-container)/2));margin-right:calc(50% - min(50vw, var(--atto-container)/2));max-width:var(--atto-container)}
.atto-content .alignfull{margin-left:calc(50% - 50vw);margin-right:calc(50% - 50vw);max-width:100vw;width:100vw}
.atto-ad{margin:18px 0;text-align:center;color:var(--atto-muted);font-size:.84rem}
.atto-toc{background:#f9fafb;border:1px solid var(--atto-border);border-radius:16px;padding:16px 18px;margin:1.3rem 0 1.8rem}
.atto-toc-title{font-weight:900;margin:0 0 .65rem}
.atto-toc ol{margin:0;padding-left:1.2rem;font-size:.93rem;line-height:1.65}
.atto-toc li{margin:.25rem 0}
.atto-toc .depth-3{margin-left:1rem;font-size:.9rem}
.atto-share{display:flex;flex-wrap:wrap;gap:.5rem;margin:1.2rem 0}
.atto-share a,.atto-share button{border:1px solid var(--atto-border);background:#fff;color:#374151;border-radius:999px;padding:.43rem .72rem;font-weight:800;font-size:.84rem;cursor:pointer;text-decoration:none}
.atto-share a:hover,.atto-share button:hover{background:var(--atto-accent-soft);color:var(--atto-accent)}
.atto-tags{display:flex;flex-wrap:wrap;gap:.45rem;margin:1.4rem 0 0}
.atto-tags a{display:inline-flex;border:1px solid var(--atto-border);background:#fafafa;color:#374151;border-radius:999px;padding:.18rem .62rem;font-size:.84rem;text-decoration:none}
.atto-author-box{display:flex;gap:14px;align-items:flex-start;background:#f9fafb;border:1px solid var(--atto-border);border-radius:16px;padding:16px;margin-top:24px}
.atto-author-box img{border-radius:50%}
.atto-author-name{font-weight:900;margin:0 0 .25rem}
.atto-author-desc{margin:0;color:#4b5563;font-size:.92rem;line-height:1.7}
.atto-post-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}
.atto-post-nav a{display:block;background:var(--atto-surface);border:1px solid var(--atto-border);border-radius:14px;padding:13px;color:var(--atto-text);font-weight:800;text-decoration:none}
.atto-post-nav span{display:block;color:var(--atto-muted);font-size:.78rem;font-weight:700;margin-bottom:.25rem}
.atto-post-nav .next{text-align:right}
.atto-related{margin-top:28px}
.atto-related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}

.atto-page-header{background:var(--atto-surface);border:1px solid var(--atto-border);border-radius:var(--atto-radius);padding:22px;margin-bottom:20px;box-shadow:var(--atto-shadow)}
.atto-page-header h1{margin:.1rem 0 .3rem;font-size:1.7rem;line-height:1.35}
.atto-page-header p{margin:.4rem 0 0;color:#4b5563}
.atto-empty{background:var(--atto-surface);border:1px solid var(--atto-border);border-radius:var(--atto-radius);padding:26px;text-align:center;box-shadow:var(--atto-shadow)}

.atto-site-footer{border-top:1px solid var(--atto-border);background:#fff;padding:28px 0;color:var(--atto-muted);font-size:.9rem}
.atto-footer-inner{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
.atto-footer-menu ul{display:flex;flex-wrap:wrap;gap:12px;list-style:none;margin:0;padding:0}
.atto-footer-menu a{color:var(--atto-muted)}
.atto-pagetop{position:fixed;right:18px;bottom:18px;border:1px solid var(--atto-border);background:var(--atto-surface);color:var(--atto-text);width:42px;height:42px;border-radius:50%;box-shadow:var(--atto-shadow);display:flex;align-items:center;justify-content:center;text-decoration:none;opacity:0;pointer-events:none;transition:.2s ease}
.atto-pagetop.is-visible{opacity:1;pointer-events:auto}

.wp-block-image img{border-radius:12px}
.wp-block-button__link{border-radius:999px;background:var(--atto-accent)}
.wp-block-separator{border:0;border-top:1px solid var(--atto-border);margin:2rem 0}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.gallery-item{margin:0}

@media (max-width:900px){
  .admin-bar .atto-site-header{top:46px}
  .atto-header-inner{min-height:64px}
  .atto-site-desc{max-width:260px}
  .atto-menu-toggle{display:inline-flex;align-items:center;gap:.35rem}
  .atto-nav{display:none;position:absolute;left:20px;right:20px;top:64px;background:#fff;border:1px solid var(--atto-border);border-radius:16px;box-shadow:var(--atto-shadow);padding:10px}
  .atto-nav.is-open{display:block}
  .atto-nav ul{display:block}
  .atto-nav a{border-radius:12px;padding:.75rem .85rem}
  .atto-layout{grid-template-columns:1fr}
  .atto-sidebar{display:block}
  .atto-post-grid,.atto-related-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  body{font-size:15px;line-height:1.8}
  .atto-container{padding:0 14px}
  .atto-main{padding:18px 0 36px}
  .atto-site-title{font-size:1.05rem}
  .atto-site-desc{display:none}
  .atto-hero,.atto-article,.atto-page-header{border-radius:14px;padding:18px}
  .atto-card-body{padding:13px}
  .atto-post-nav{grid-template-columns:1fr}
  .atto-post-nav .next{text-align:left}
  .gallery{grid-template-columns:repeat(2,1fr)}
}

.comment-list{list-style:none;margin:0;padding:0}
.comment-list .comment{border-bottom:1px solid var(--atto-border);padding:1rem 0}
.comment-list .children{list-style:none;margin:.8rem 0 0 1rem;padding-left:1rem;border-left:2px solid var(--atto-border)}
.comment-author .avatar{border-radius:50%;margin-right:.45rem}
.comment-metadata,.comment-notes,.logged-in-as{font-size:.86rem;color:var(--atto-muted)}
.comment-form textarea,.comment-form input[type="text"],.comment-form input[type="email"],.comment-form input[type="url"]{width:100%;border:1px solid var(--atto-border);border-radius:12px;padding:.7rem;background:#fff}
.comment-form input[type="submit"]{border:0;border-radius:12px;background:var(--atto-accent);color:#fff;font-weight:800;padding:.7rem 1rem;cursor:pointer}