/* Knowledge theme — Aurora color system:
   deep-indigo (never pure black) base with violet/cyan/fuchsia aurora glows,
   gradient buttons and display type, tinted hairline borders. */
:root{
  --bg:#f5f5fa; --card:#ffffff; --panel:#eeeef7; --text:#17142b; --muted:#655f80;
  --line:rgba(43,36,96,.13); --line2:rgba(43,36,96,.26);
  --accent:#6d28d9; --accent-soft:#efeafd;
  --code-bg:#efeff8; --link:#17142b; --hover:rgba(109,40,217,.06);
  --glass:rgba(245,245,250,.8); --glow:rgba(139,92,246,.13);
  --aur1:rgba(124,58,237,.12); --aur2:rgba(2,132,199,.12); --aur3:rgba(219,39,119,.09);
  --grad-btn:linear-gradient(92deg,#7c3aed,#db2777);
  --grad-text:linear-gradient(92deg,#7c3aed,#2563eb 45%,#0891b2 75%,#c026d3);
  color-scheme:light;
}
[data-theme="dark"]{
  --bg:#14142a; --card:#1e1e38; --panel:#22223e; --text:#f2f1fa; --muted:#a9a7c6;
  --line:rgba(199,193,255,.16); --line2:rgba(199,193,255,.32);
  --accent:#a78bfa; --accent-soft:#282154;
  --code-bg:#1e1e38; --link:#f2f1fa; --hover:rgba(167,139,250,.1);
  --glass:rgba(20,20,42,.72); --glow:rgba(139,92,246,.3);
  --aur1:rgba(124,58,237,.33); --aur2:rgba(8,145,178,.26); --aur3:rgba(217,70,239,.2);
  --grad-btn:linear-gradient(92deg,#7c3aed,#db2777);
  --grad-text:linear-gradient(92deg,#c4b5fd,#7dd3fc 45%,#f0abfc);
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:
  radial-gradient(760px 440px at 10% -6%,var(--aur1),transparent 62%),
  radial-gradient(780px 460px at 90% -10%,var(--aur2),transparent 62%),
  radial-gradient(960px 640px at 50% 118%,var(--aur3),transparent 65%)}
::selection{background:rgba(139,92,246,.35)}
a{color:var(--link);text-decoration-color:var(--line2);text-underline-offset:3px}
a:hover{color:var(--text);text-decoration-color:var(--accent)}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--grad-btn);color:#fff;padding:.4rem .8rem;z-index:60;border-radius:0 0 8px 0}
.skip-link:focus{left:0;top:0}
/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:var(--glass);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.site-main,.site-footer,.header-inner,.site-nav,.search-box{max-width:1120px;margin:0 auto;padding-left:20px;padding-right:20px}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:2px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none}
.brand-icon{border-radius:8px}
.brand-name{font-size:1.22rem;font-weight:650;letter-spacing:-.01em;color:var(--text)}
.header-tools{display:flex;gap:4px;align-items:center}
.icon-btn{background:none;border:0;color:var(--muted);cursor:pointer;padding:7px;border-radius:8px;line-height:0;display:inline-flex;align-items:center}
.icon-btn:hover{background:var(--hover);color:var(--text)}
[data-theme="light"] .icon-moon{display:none}
[data-theme="dark"] .icon-sun{display:none}
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.7rem;line-height:1;
  border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:.18rem .34rem;color:var(--muted);margin-left:2px}
.site-nav{display:flex;flex-wrap:wrap;gap:2px;padding-top:6px;padding-bottom:12px}
.site-nav a{color:var(--muted);text-decoration:none;font-weight:550;font-size:.95rem;padding:.32rem .78rem;border-radius:8px}
.site-nav a:hover{color:var(--accent);background:var(--hover)}
.search-box{display:flex;gap:8px;padding-top:12px;padding-bottom:14px}
.search-box[hidden]{display:none}
.search-box input{flex:1;padding:.55rem .85rem;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--text);font-size:1rem;font-family:inherit}
.search-box input:focus{outline:none;border-color:var(--accent)}
.search-box button{padding:.55rem 1.05rem;border:0;border-radius:10px;background:var(--grad-btn);color:#fff;cursor:pointer;font-weight:550;font-family:inherit}
/* ---------- generic ---------- */
.site-main{padding-top:30px;min-height:62vh}
.section-label{text-transform:uppercase;letter-spacing:.14em;font-size:.7rem;color:var(--accent);font-weight:700;margin:0 0 .35rem}
.btn{display:inline-block;padding:.55rem 1.15rem;border-radius:10px;background:var(--grad-btn);color:#fff;text-decoration:none;font-weight:550;border:0;box-shadow:0 8px 22px -10px rgba(219,39,119,.55)}
.btn:hover{color:#fff;filter:brightness(1.08)}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line2);box-shadow:none}
.btn-ghost:hover{color:var(--accent);background:var(--hover);border-color:var(--accent);filter:none}
.empty{color:var(--muted);padding:2rem 0}
/* ---------- hero (home) ---------- */
.hero{text-align:center;padding:3.4rem 0 1.2rem;position:relative;isolation:isolate}
.hero::before{content:"";position:absolute;z-index:-1;left:50%;top:-70px;transform:translateX(-50%);
  width:min(880px,120%);height:380px;pointer-events:none;
  background:radial-gradient(closest-side,var(--glow),transparent)}
.hero h1{font-size:clamp(2.3rem,5.6vw,3.4rem);line-height:1.15;font-weight:700;letter-spacing:-.025em;margin:.3rem 0 1rem;
  background:var(--grad-text);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-desc{color:var(--muted);max-width:36rem;margin:0 auto;font-size:1.05rem}
.hero-links{margin-top:1.6rem}
.hero-stats{display:flex;justify-content:center;gap:0;margin-top:2rem;color:var(--muted);font-size:.93rem;flex-wrap:wrap}
.hero-stats span{padding:0 1.1rem}
.hero-stats span+span{border-left:1px solid var(--line)}
.hero-stats strong{color:var(--accent);font-size:1.12rem;font-weight:650;margin-right:.3rem}
.hero-quote{margin:1.6rem auto 0;max-width:36rem;color:var(--muted);font-size:.95rem}
.hero-quote .hq-label{display:inline-block;color:var(--accent);border:1px solid var(--line2);border-radius:999px;padding:.05rem .55rem;font-size:.72rem;font-weight:700;letter-spacing:.08em;margin-right:.6rem;vertical-align:.08em}
.hero-quote .hq-text{color:var(--text)}
.hero-quote .hq-from{color:var(--accent);font-size:.85rem;margin-left:.45rem;white-space:nowrap}
.quiz-banner{display:flex;align-items:center;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 20px;text-decoration:none;color:var(--text);transition:border-color .18s,transform .18s}
.quiz-banner:hover{border-color:var(--line2);transform:translateY(-2px);color:var(--text)}
.quiz-emoji{font-size:1.7rem;line-height:1;flex:none}
.quiz-main{display:flex;flex-direction:column;gap:.15rem;flex:1;min-width:0}
.quiz-main strong{font-size:1.05rem}
.quiz-main span{color:var(--muted);font-size:.9rem}
.quiz-go{color:var(--accent);font-weight:600;white-space:nowrap;font-size:.93rem}
/* ---------- home blocks ---------- */
.home-block{margin-top:3rem}
.block-head{display:flex;align-items:baseline;gap:1rem;flex-wrap:wrap}
.block-head h2{margin:.1rem 0 .9rem;font-size:1.32rem;font-weight:650;letter-spacing:-.01em}
.block-head>a,.block-head>span{margin-left:auto;color:var(--muted);font-size:.9rem;text-decoration:none}
.block-head>a:hover{color:var(--accent)}
.series-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.series-card{display:block;position:relative;overflow:hidden;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;text-decoration:none;transition:border-color .18s,transform .18s}
.series-card::before{content:"";position:absolute;inset:0 0 auto;height:3px;background:var(--grad-text)}
.series-grid .series-card:nth-child(2)::before{filter:hue-rotate(50deg)}
.series-card:hover{border-color:var(--line2);transform:translateY(-2px);color:var(--text)}
.series-card h3{margin:.1rem 0 .5rem;font-size:1.06rem;font-weight:620}
.series-card p{color:var(--muted);font-size:.92rem;margin:.2rem 0 .8rem}
.series-count{color:var(--accent);font-weight:600;font-size:.87rem}
.cat-row{display:flex;align-items:baseline;gap:14px;padding:14px 6px;border-bottom:1px solid var(--line);text-decoration:none}
.cat-row:hover{background:var(--hover)}
.cat-row span{color:var(--muted);flex:1;font-size:.92rem}
.cat-row em{font-style:normal;color:var(--accent);font-weight:600;white-space:nowrap}
.note-list{list-style:none;margin:0;padding:0;max-width:58rem}
.note-item{display:flex;gap:14px;align-items:flex-start;padding:15px 6px;border-bottom:1px solid var(--line)}
.note-item:hover{background:var(--hover)}
.note-main{flex:1;min-width:0}
.note-thumb{flex:none;width:58px;height:58px;margin-top:3px;border-radius:14px;display:grid;place-items:center;
  color:#fff;font-family:"Noto Serif SC","Songti SC","STSong","SimSun",serif;font-weight:700;font-size:1.5rem;line-height:1;
  background:linear-gradient(135deg,var(--tg1),var(--tg2));box-shadow:0 8px 18px -9px var(--tg2);
  text-shadow:0 1px 6px rgba(20,16,60,.25);user-select:none}
.note-thumb.g1{--tg1:#7c3aed;--tg2:#db2777}
.note-thumb.g2{--tg1:#2563eb;--tg2:#0891b2}
.note-thumb.g3{--tg1:#0891b2;--tg2:#059669}
.note-thumb.g4{--tg1:#c026d3;--tg2:#7c3aed}
.note-thumb.g5{--tg1:#db2777;--tg2:#ea580c}
.note-meta{display:flex;gap:12px;color:var(--muted);font-size:.84rem}
.note-series{color:var(--accent);text-decoration:none;font-weight:600}
.note-title{font-size:1.07rem;font-weight:620;letter-spacing:-.005em;text-decoration:none;display:inline-block;margin-top:2px;color:var(--text)}
.note-title:hover{color:var(--accent)}
.note-desc{color:var(--muted);margin:.25rem 0 0;font-size:.93rem}
.tag-cloud a{display:inline-block;margin:0 .5rem .5rem 0;color:var(--muted);text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:.18rem .75rem;font-size:.9rem}
.tag-cloud a:hover{color:var(--accent);border-color:var(--accent);background:var(--hover)}
.chip{display:inline-block;background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:.25rem .8rem;margin:0 .4rem .4rem 0;text-decoration:none}
/* ---------- moments ---------- */
.moment-row{display:flex;gap:16px;align-items:baseline;padding:13px 6px;border-bottom:1px solid var(--line);text-decoration:none}
.moment-row:hover{background:var(--hover)}
.moment-row time{color:var(--accent);font-weight:600;font-size:.84rem;white-space:nowrap;min-width:5.2rem}
.moment-row p{margin:0;color:var(--text);font-size:.96rem}
.moments{margin-top:.4rem;max-width:52rem}
.moment{display:grid;grid-template-columns:104px 1fr;gap:20px;padding:20px 0;border-bottom:1px solid var(--line)}
.moment-time{color:var(--accent);font-weight:600;font-size:.84rem;text-align:right;padding-top:.28rem;white-space:nowrap}
.moment-body{font-size:.99rem}
.moment-body p{margin:.35rem 0}
.moment-body p:first-child{margin-top:0}
.moment-body a{text-decoration:underline}
/* ---------- projects ---------- */
.project-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.project-card{display:flex;flex-direction:column;gap:.6rem;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;text-decoration:none;transition:border-color .18s,transform .18s;color:var(--text)}
.project-card:hover{border-color:var(--line2);transform:translateY(-2px);color:var(--text)}
.project-head{display:flex;align-items:center;gap:12px}
.project-mono{width:40px;height:40px;flex:none;border-radius:10px;background:linear-gradient(135deg,#7c3aed,#db2777);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.02rem}
.project-grid .project-card:nth-child(2) .project-mono{background:linear-gradient(135deg,#2563eb,#06b6d4)}
.project-grid .project-card:nth-child(3) .project-mono{background:linear-gradient(135deg,#f59e0b,#ef4444)}
.project-grid .project-card:nth-child(4) .project-mono{background:linear-gradient(135deg,#059669,#06b6d4)}
.project-head h3{margin:0;font-size:1.05rem;font-weight:620;letter-spacing:-.005em}
.project-status{margin-left:auto;flex:none;font-size:.74rem;border:1px solid var(--line);padding:.12rem .55rem;border-radius:999px;color:var(--muted);white-space:nowrap}
.project-desc{color:var(--muted);font-size:.93rem;margin:0;flex:1}
.project-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.p-chip{border:1px solid var(--line);border-radius:999px;padding:.1rem .6rem;font-size:.79rem;color:var(--muted)}
.project-link{color:var(--muted);font-size:.86rem;margin-left:auto}
/* ---------- article ---------- */
.post{max-width:47rem}
.archive-head h1,.post-head h1{font-size:2.05rem;line-height:1.3;font-weight:680;letter-spacing:-.02em;margin:.2rem 0 .8rem}
.chapter-list{margin:0;padding-left:1.3rem}
.chapter-list li{margin:.45rem 0}
.chapter-list li span{display:block;color:var(--muted);font-size:.9rem}
.post-meta{color:var(--muted);font-size:.9rem}
.post-meta a{color:var(--accent);text-decoration:none;font-weight:600}
.post-meta .sep{margin:0 .45rem}
.post-lede{color:var(--muted);font-size:1.04rem;border-left:3px solid var(--accent);padding-left:14px}
.toc{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 18px;margin:1.4rem 0}
.toc-title{margin:0 0 .4rem;font-weight:650}
.toc-list{margin:0;padding-left:.15rem;list-style:none}
.toc-list>li{margin:.3rem 0}
.toc-sub{list-style:none;margin:.25rem 0 .15rem;padding-left:1.15rem}
.toc-list .toc-h3{list-style:none;font-size:.92rem;margin:.22rem 0}
.toc-list>.toc-h3{padding-left:1.15rem}
.toc-list a{text-decoration:none;color:var(--muted)}
.toc-list a:hover{color:var(--accent)}
.prose{overflow-wrap:break-word}
.prose h2{font-size:1.45rem;margin:2.2rem 0 .7rem;line-height:1.4;font-weight:650;letter-spacing:-.01em}
.prose h3{font-size:1.18rem;margin:1.8rem 0 .5rem;font-weight:620}
.prose h4{margin:1.4rem 0 .4rem}
.prose p{margin:.8rem 0}
.prose ul,.prose ol{padding-left:1.5rem}
.prose li{margin:.3rem 0}
.prose a{text-decoration-color:color-mix(in srgb,var(--accent) 45%,transparent)}
.prose blockquote{margin:1rem 0;padding:.55rem 1rem;border-left:3px solid var(--accent);background:var(--panel);border-radius:0 10px 10px 0;color:var(--muted)}
.prose blockquote p{margin:.4rem 0}
.prose code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.87em;background:var(--code-bg);border:1px solid var(--line);padding:.1em .35em;border-radius:6px}
.prose pre{position:relative;background:var(--code-bg);border:1px solid var(--line);border-radius:12px;padding:14px 16px;overflow-x:auto;line-height:1.6}
.prose pre code{background:none;border:0;padding:0;font-size:.86rem}
.prose table{display:block;overflow-x:auto;border-collapse:collapse;margin:1.1rem 0;font-size:.93rem}
.prose th,.prose td{border:1px solid var(--line);padding:.45rem .7rem;text-align:left}
.prose th{background:var(--panel)}
.prose img{max-width:100%;border-radius:10px}
.prose hr{border:0;border-top:1px solid var(--line);margin:2rem 0}
.prose .mermaid{background:transparent;text-align:center}
.post-tags{margin-top:2rem}
.post-tags a{margin-right:.6rem;color:var(--muted);text-decoration:none}
.post-tags a:hover{color:var(--accent)}
.series-box{margin-top:2.6rem;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px 22px}
.series-box h2{margin:.1rem 0 .8rem;font-size:1.2rem}
.series-box h2 a{text-decoration:none}
.series-chapters{margin:0;padding-left:1.4rem}
.series-chapters li{margin:.3rem 0}
.series-chapters li.current a{color:var(--accent);font-weight:700}
.series-paging{display:flex;gap:.9rem;margin-top:1.2rem;flex-wrap:wrap}
.series-paging a{flex:1 1 12rem;text-decoration:none;font-weight:600;color:var(--text);background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.75rem 1rem;line-height:1.5;transition:border-color .15s ease,background .15s ease}
.series-paging a:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
.series-paging a.next{text-align:right}
.series-intro{margin-bottom:.5rem;max-width:47rem}
/* ---------- indexes / paging / footer ---------- */
.tag-index{list-style:none;padding:0;margin:0;columns:2;column-gap:2rem;max-width:58rem}
.tag-index li{display:flex;justify-content:space-between;padding:.45rem 0;border-bottom:1px solid var(--line);break-inside:avoid}
.tag-index a{text-decoration:none}
.tag-index span{color:var(--muted)}
.paging{margin:2rem 0;text-align:center}
.paging .page-nav,.paging ol{list-style:none;display:flex;gap:.5rem;justify-content:center;padding:0}
.paging a{text-decoration:none;padding:.2rem .6rem;border-radius:6px}
.paging .current a,.paging a:hover{background:var(--accent-soft);color:var(--accent)}
.site-footer{max-width:1120px;border-top:1px solid var(--line);margin-top:3.5rem;padding-top:1.4rem;padding-bottom:2.2rem;color:var(--muted);font-size:.9rem}
.footer-inner{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.footer-inner p{margin:0}
.footer-nav a{color:var(--muted);text-decoration:none;margin-left:1rem}
.footer-nav a:hover{color:var(--accent)}
.katex-display{overflow-x:auto;padding:.4rem 0}
/* ---------- heatmap ---------- */
.heatmap{display:flex;gap:3px;overflow-x:auto;padding:6px 2px 10px}
.hm-col{display:grid;grid-template-rows:repeat(7,11px);gap:3px}
.hm-cell{width:11px;height:11px;border-radius:3px;background:var(--panel);display:inline-block;flex:none}
.hm-cell.hm0{background:var(--panel)}
.hm-cell.hm1{background:color-mix(in srgb,#7c3aed 32%,var(--panel))}
.hm-cell.hm2{background:color-mix(in srgb,#7c3aed 58%,var(--panel))}
.hm-cell.hm3{background:color-mix(in srgb,#db2777 72%,var(--panel))}
.hm-cell.hm4{background:linear-gradient(135deg,#7c3aed,#db2777)}
.hm-empty{background:transparent}
.hm-legend{display:flex;align-items:center;gap:4px;color:var(--muted);font-size:.82rem;margin:.2rem 0 0}
.hm-legend .hm-cell{margin:0 1px}
/* ---------- books ---------- */
.book-list{border-top:1px solid var(--line)}
.book-row{display:flex;gap:14px;align-items:flex-start;padding:15px 6px;border-bottom:1px solid var(--line)}
.book-row .project-mono{margin-top:2px}
.book-list .book-row:nth-child(2) .project-mono{background:linear-gradient(135deg,#2563eb,#06b6d4)}
.book-list .book-row:nth-child(3) .project-mono{background:linear-gradient(135deg,#f59e0b,#ef4444)}
.book-list .book-row:nth-child(4) .project-mono{background:linear-gradient(135deg,#059669,#06b6d4)}
.book-main{flex:1;min-width:0}
.book-title{margin:0;font-weight:620;font-size:1.02rem}
.book-author{color:var(--muted);font-weight:500;font-size:.88rem;margin-left:.6rem}
.book-desc{margin:.15rem 0 0;color:var(--muted);font-size:.92rem}
.book-progress{flex:none;color:var(--accent);font-size:.85rem;font-weight:550;text-align:right;max-width:42%}
/* ---------- likes & related ---------- */
.post-actions{display:flex;align-items:center;gap:12px;margin-top:2rem}
.like-btn{display:inline-flex;align-items:center;gap:8px;padding:.5rem 1.05rem;border-radius:999px;border:1px solid var(--line2);background:var(--card);color:var(--text);font:inherit;font-weight:550;cursor:pointer}
.like-btn:hover{border-color:var(--accent);color:var(--accent)}
.like-btn.liked{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
.like-btn.liked svg{fill:var(--accent)}
.like-btn strong{font-weight:650}
.like-tip{color:var(--muted);font-size:.9rem}
.related-box{margin-top:2.8rem}
.related-box h2{font-size:1.25rem;margin:.1rem 0 .6rem}
/* ---------- comments (guestbook) ---------- */
.comments{margin-top:2.6rem;border-top:1px solid var(--line);padding-top:1.4rem}
.comments-title{font-size:1.2rem;margin:.4rem 0 1rem}
.cmt-list{list-style:none;margin:0;padding:0}
.cmt{padding:14px 0;border-bottom:1px solid var(--line)}
.cmt-l1{margin-left:1.6rem}.cmt-l2{margin-left:3.2rem}.cmt-l3{margin-left:4.4rem}.cmt-l4{margin-left:5.2rem}
.cmt-meta{display:flex;gap:12px;align-items:baseline;color:var(--muted);font-size:.85rem}
.cmt-author{color:var(--text);font-weight:620;font-size:.95rem}
.cmt-body{margin-top:.2rem}
.cmt-body p{margin:.3rem 0}
.cmt-form{margin-top:1.8rem}
.cmt-form input,.cmt-form textarea{width:100%;padding:.55rem .85rem;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--text);font:inherit}
.cmt-form input:focus,.cmt-form textarea:focus{outline:none;border-color:var(--accent)}
.cmt-form p{margin:.6rem 0}
.cmt-note{color:var(--muted);font-size:.88rem;margin-left:.6rem}
/* ---------- reading progress & code copy ---------- */
.reading-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--grad-btn);z-index:80;pointer-events:none}
.copy-btn{position:absolute;top:8px;right:8px;padding:.22rem .6rem;font:inherit;font-size:.76rem;font-weight:550;color:var(--muted);background:var(--card);border:1px solid var(--line2);border-radius:8px;cursor:pointer;opacity:0;transition:opacity .15s ease,color .15s ease,border-color .15s ease}
.prose pre:hover .copy-btn,.copy-btn:focus-visible{opacity:1}
.copy-btn:hover{color:var(--accent);border-color:var(--accent)}
.copy-btn.copied{opacity:1;color:var(--accent);border-color:var(--accent)}
@media (hover:none){.copy-btn{opacity:.85}}
/* ---------- instant search results ---------- */
.search-results{max-width:1120px;margin:0 auto;padding:0 20px 14px}
.search-results:empty{display:none}
.search-result{display:block;text-decoration:none;padding:.6rem .8rem;border-radius:10px}
.search-result:hover,.search-result.active{background:var(--hover)}
.search-result-title{color:var(--text);font-weight:600;font-size:.98rem}
.search-result-title mark,.search-result-snippet mark{background:none;color:var(--accent);font-weight:700;padding:0}
.search-result-snippet{color:var(--muted);font-size:.86rem;margin-top:.15rem;line-height:1.55;overflow-wrap:break-word}
.search-empty{color:var(--muted);font-size:.9rem;padding:.5rem .8rem;margin:0}
/* ---------- moments by month ---------- */
.moment-nav{display:flex;gap:.5rem;flex-wrap:wrap;margin:.2rem 0 .6rem}
.moment-nav a{text-decoration:none;font-size:.85rem;font-weight:550;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:.28rem .8rem;background:var(--card)}
.moment-nav a:hover{color:var(--accent);border-color:var(--accent)}
.moment-month{font-size:1.15rem;margin:1.8rem 0 .2rem;scroll-margin-top:110px}
.moment-month:first-of-type{margin-top:.8rem}
@media (max-width:640px){
  .series-grid,.project-grid{grid-template-columns:1fr}
  .archive-head h1,.post-head h1{font-size:1.55rem}
  .tag-index{columns:1}
  .site-nav a{padding:.3rem .55rem}
  .brand-name{font-size:1.08rem}
  .kbd{display:none}
  .moment{grid-template-columns:1fr;gap:2px;padding:16px 0}
  .moment-time{text-align:left;padding-top:0}
  .hero{padding-top:2.2rem}
  .hero-stats span{padding:0 .7rem}
}