/* AIちかづみ: local extension of the existing chikai.dev design. */
.idea-blog,.idea-entry{overflow-wrap:anywhere}
.idea-blog{max-width:850px;margin:0 auto;padding:72px 28px 80px}
.idea-blog-header{padding:0 0 64px}
.idea-eyebrow{font-family:var(--font-en);font-size:.72rem!important;font-weight:700;letter-spacing:.13em;color:var(--blue);margin-bottom:22px!important}
.idea-blog h1{font-size:clamp(2.8rem,7vw,4.7rem);line-height:1.22;font-weight:900;letter-spacing:-.055em;margin-bottom:28px}
.idea-blog h1>span{font-size:.62em;color:var(--blue);letter-spacing:-.03em}
.idea-blog-lead{font-size:clamp(1.15rem,3vw,1.5rem);line-height:1.8;margin-bottom:20px}
.idea-blog-intro{color:#58616e;line-height:2;font-size:.95rem}
.idea-rss{display:inline-block;margin-top:24px;color:var(--blue);text-underline-offset:5px;font-size:.82rem}
.idea-section-label{display:flex;justify-content:space-between;align-items:center;border-top:2px solid var(--text);padding-top:18px;margin-bottom:20px;gap:16px}
.idea-section-label h2{font-size:.9rem}.idea-section-label>span{font:700 .68rem var(--font-en);letter-spacing:.1em;color:#58616e}
.idea-featured{display:block;color:var(--text);text-decoration:none;border:1px solid #d8dfe9;background:#fff;padding:36px;border-radius:var(--radius);transition:border-color .2s,box-shadow .2s}
.idea-featured:hover{border-color:var(--blue);box-shadow:0 10px 30px rgba(37,99,235,.07)}
.idea-card-meta{display:flex;flex-wrap:wrap;gap:18px;align-items:center;color:#58616e;font:700 .75rem var(--font-en);margin-bottom:25px}
.idea-card-meta>span:first-child{background:var(--blue);color:#fff;padding:5px 9px;border-radius:4px}
.idea-featured h3{font-size:clamp(1.75rem,5vw,2.45rem);line-height:1.5;letter-spacing:-.035em;margin-bottom:20px}
.idea-featured>p{max-width:560px;font-size:.95rem;line-height:1.95;color:#58616e;margin-bottom:28px}
.idea-card-link{display:flex;align-items:center;justify-content:space-between;font-size:.85rem;font-weight:700;color:var(--blue)}
.idea-card-link>span{font-size:1.4rem}
.idea-about{margin-top:64px}.idea-about>h2{font-size:1rem;margin-bottom:16px}.idea-about>p{font-size:.92rem;line-height:2;color:#58616e}
.idea-author{display:flex;gap:18px;align-items:flex-start;border-top:1px solid #d8dfe9;margin-top:36px;padding-top:28px}
.author-mark{flex-shrink:0;background:var(--black);color:white;width:44px;height:44px;display:grid;place-items:center;font:900 .85rem var(--font-en);border-radius:8px}
.idea-author .author-name{color:var(--text);font-weight:700;font-size:.85rem;margin:0 0 8px}
.idea-author p{font-size:.78rem;color:#58616e;line-height:1.9;margin:0}
.idea-entry{padding-top:56px;max-width:770px}
.idea-entry h1{font-size:clamp(2rem,5vw,3rem);letter-spacing:-.045em;line-height:1.4}
.idea-entry .idea-deck{font-size:1rem;color:#58616e;margin:20px 0 24px;line-height:1.95}
.idea-entry .article-meta{flex-wrap:wrap;letter-spacing:.02em;color:#58616e}
.idea-entry .idea-disclosure{margin:18px 0 0;font-size:.72rem;color:#58616e;line-height:1.85}
.idea-thesis{padding:24px 28px;background:#eef4ff;border-left:4px solid var(--blue);margin:0 0 32px}
.idea-thesis .idea-eyebrow{margin-bottom:10px!important;font-size:.68rem!important}
.idea-thesis p:last-child{font-size:1.07rem;line-height:1.95;margin-bottom:0}
.idea-entry article>p{font-size:1rem;line-height:2.05;margin-bottom:24px}
.idea-entry h2{font-size:1.24rem;margin-top:44px}
.idea-entry .idea-scenes{list-style:none;margin:24px 0 28px;padding:0;border-top:1px solid #d8dfe9}
.idea-scenes li{display:flex;gap:20px;padding:22px 0;border-bottom:1px solid #d8dfe9;margin:0}
.scene-time{flex:0 0 68px;font:700 .78rem var(--font-en);color:var(--blue);padding-top:5px;white-space:nowrap}
.idea-scenes h3{font-size:.95rem;margin:0 0 8px}.idea-scenes p{font-size:.88rem;line-height:1.9;margin:0;color:#58616e}
.idea-entry .idea-last-question{margin:36px 0 48px;padding:26px 0;border-top:2px solid var(--text);font-size:1.1rem}
.idea-sources{background:#f0f2f5;padding:24px 28px;border-radius:8px}
.idea-sources h2{margin:0 0 16px;border:0;padding:0;font-size:.88rem}
.idea-sources p,.idea-sources li{font-size:.78rem;line-height:1.9;color:#58616e}
.idea-sources ul{margin:0;padding-left:18px}.idea-sources li{margin-bottom:14px}.idea-sources li:last-child{margin-bottom:0}
.idea-sources a,.idea-return a{color:var(--blue);text-underline-offset:4px}.source-date{display:block;font-size:.7rem;margin-top:4px}
.idea-return{margin-top:32px}
.idea-skip{position:absolute;left:16px;top:8px;transform:translateY(-160%);z-index:10;padding:10px 16px;background:var(--blue);color:#fff}
.idea-skip:focus{transform:none}
@media(max-width:640px){
  .idea-blog{padding:44px 20px 56px}.idea-blog-header{padding-bottom:44px}
  .idea-featured{padding:25px 22px}.idea-about{margin-top:44px}.idea-entry{padding:36px 20px 48px}
  .idea-thesis,.idea-sources{padding:20px}.idea-scenes li{gap:12px}.scene-time{flex-basis:60px}
  .desktop-break{display:none}.idea-entry article>p{font-size:.96rem}
}
@media(prefers-reduced-motion:reduce){.idea-featured{transition:none}}

/* Article-specific lightweight OGP cover. */
.idea-entry .idea-cover{margin:0 0 32px}
.idea-entry .idea-cover img{display:block;width:100%;max-width:100%;height:auto;border-radius:8px}