/* AI工具箱 — public site styles */
*,*::before,*::after{box-sizing:border-box}
:root{
  --fg:#1b1f26;--muted:#697386;--bg:#fbfaf7;--card:#fff;
  --line:#ece8df;--brand:#1769e0;--brand-dark:#1254b3;
  --radius:10px;--maxw:1240px;
  --serif:Georgia,"Times New Roman","Noto Serif SC",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--fg);background:var(--bg);line-height:1.6}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.site-bar{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{font-family:var(--serif);font-weight:700;font-size:22px;color:var(--fg);letter-spacing:.2px}
.brand:hover{text-decoration:none}
.site-nav{display:flex;gap:20px;flex-wrap:wrap}
.site-nav a{color:#3a4252;font-size:15px;font-weight:500}
.site-nav a:hover{color:var(--brand);text-decoration:none}
.site-nav a.is-active{color:var(--brand);font-weight:600}

/* main */
.site-main{padding:40px 24px 64px;min-height:60vh}
.page-title{font-family:var(--serif);font-size:30px;margin:0 0 24px;font-weight:700}

/* post grid */
/* Article list (horizontal rows: thumbnail + text) */
.post-list{display:flex;flex-direction:column;gap:0}
.post-row{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.post-row:first-child{padding-top:0}
.post-row:last-child{border-bottom:0}
.post-row__cover{flex-shrink:0;width:180px;aspect-ratio:16/10;overflow:hidden;border-radius:8px;background:#eef2f7}
.post-row__cover img{width:100%;height:100%;object-fit:cover;transition:transform .2s ease}
.post-row:hover .post-row__cover img{transform:scale(1.04)}
.post-row__body{flex:1;min-width:0;display:flex;flex-direction:column;gap:6px}
.post-row__title{font-size:20px;line-height:1.35;margin:0;font-weight:650}
.post-row__title a{color:var(--fg)}
.post-row__title a:hover{color:var(--brand);text-decoration:none}
.post-row__summary{color:var(--muted);font-size:14.5px;margin:0;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-row__meta{color:#9aa1ad;font-size:13px;margin-top:auto}
.post-row__meta time{font-variant-numeric:tabular-nums}

.chip{display:inline-block;font-size:12px;font-weight:600;color:var(--brand);background:#eaf1fd;border-radius:20px;padding:3px 10px;align-self:flex-start}
.chip a{color:inherit}
.chip a:hover{text-decoration:none}

/* Two-column layout: main content + sidebar */
.layout{display:grid;grid-template-columns:1fr 300px;gap:36px;align-items:start}
.sidebar{position:sticky;top:20px;display:flex;flex-direction:column;gap:20px;max-height:calc(100vh - 84px);overflow-y:auto;padding-right:4px}
.side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 16px}
.side-card__title{font-size:15px;font-weight:700;margin:0 0 14px;padding-bottom:10px;border-bottom:2px solid var(--brand);color:var(--fg)}
.side-list{list-style:none;margin:0;padding:0;counter-reset:rank}
.side-list__item{display:flex;justify-content:space-between;align-items:baseline;gap:8px;padding:9px 0;border-bottom:1px dashed var(--line)}
.side-list__item:last-child{border-bottom:0}
.side-list__item::before{counter-increment:rank;content:counter(rank);flex-shrink:0;width:20px;height:20px;line-height:20px;text-align:center;font-size:11px;font-weight:700;color:#fff;background:var(--brand);border-radius:50%;opacity:.5}
.side-list__item:nth-child(-n+3)::before{opacity:1}
.side-list__item a{font-size:13.5px;color:var(--fg);line-height:1.4;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.side-list__item a:hover{color:var(--brand);text-decoration:none}
.side-list__views{font-size:11px;color:#9aa1ad;flex-shrink:0;font-variant-numeric:tabular-nums}
.side-about__text{font-size:13.5px;color:var(--muted);line-height:1.7;margin:0 0 12px}
.side-about__rss{display:inline-block;font-size:13px;color:var(--brand);text-decoration:none}
.side-about__rss:hover{text-decoration:underline}

/* article */
.article{max-width:820px;margin:0 auto}
.article__cover{width:100%;max-height:440px;object-fit:cover;border-radius:14px;margin:0 0 28px}
.article__video{width:100%;max-height:560px;border-radius:14px;margin:0 0 24px;background:#000;display:block}
.article__header{margin-bottom:24px}
.article__title{font-family:var(--serif);font-size:42px;line-height:1.15;margin:12px 0 0;font-weight:700;letter-spacing:-.01em}
.article__meta{color:var(--muted);font-size:14px;margin-top:10px;display:flex;gap:12px;align-items:center}
.article__summary{font-size:18px;color:#475063;line-height:1.6;margin:16px 0 0;border-left:3px solid var(--brand);padding-left:14px}
.article__tags{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 28px}
.tag{font-size:13px;color:#5a6376;background:#eef0f4;border-radius:6px;padding:4px 10px}
.tag:hover{background:#e3e7ee;text-decoration:none}

/* markdown content */
.article__content{font-size:18px;line-height:1.85;color:#26303f}
.article__content h1,.article__content h2,.article__content h3,.article__content h4{line-height:1.3;margin:1.6em 0 .6em;font-weight:650}
.article__content h1{font-size:30px}
.article__content h2{font-size:25px;padding-bottom:.3em;border-bottom:1px solid var(--line)}
.article__content h3{font-size:21px}
.article__content p{margin:.8em 0}
.article__content a{color:var(--brand);text-decoration:underline;text-underline-offset:2px}
.article__content ul,.article__content ol{padding-left:1.5em;margin:.8em 0}
.article__content li{margin:.35em 0}
.article__content blockquote{margin:1.2em 0;padding:.4em 1.1em;border-left:4px solid var(--brand);background:#f6f8fc;color:#475063;border-radius:0 8px 8px 0}
.article__content blockquote p{margin:.4em 0}
.article__content img{border-radius:8px;margin:1.2em auto;box-shadow:0 6px 20px rgba(18,31,52,.08)}
.article__content code{font-family:"SF Mono",Menlo,Consolas,monospace;font-size:.86em;background:#f0f2f6;padding:.15em .4em;border-radius:4px}
.article__content pre{background:#1e2638;color:#e6e9ef;padding:16px 18px;border-radius:10px;overflow-x:auto;margin:1.2em 0;line-height:1.6;position:relative}
.article__content pre code{background:none;padding:0;font-size:14px;color:inherit}
.code-copy{position:absolute;top:8px;right:8px;font-size:12px;background:rgba(255,255,255,.12);color:#cfd6e4;border:1px solid rgba(255,255,255,.18);border-radius:6px;padding:3px 10px;cursor:pointer;backdrop-filter:blur(2px)}
.code-copy:hover{background:rgba(255,255,255,.2)}
.article__content hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.article__content table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:16px}
.article__content th,.article__content td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.article__content th{background:#f6f8fc;font-weight:600}

/* gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:32px 0}
.gallery__item{margin:0}
.gallery__item img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:8px;background:#eef2f7}
.gallery__item figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:6px}

/* image carousel (gallery-type articles) */
.slider{position:relative;margin:24px 0;overflow:hidden;border-radius:12px;background:#f0f2f6}
.slider__track{display:flex;transition:transform .35s ease}
.slider__slide{min-width:100%;margin:0;text-align:center;display:flex;flex-direction:column}
.slider__slide img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;flex-shrink:0}
.slider__slide figcaption{padding:14px 20px 20px;color:#475063;font-size:15px;line-height:1.6;text-align:center;background:#fff;word-break:break-word}
.slider{cursor:grab;user-select:none;-webkit-user-select:none}
.slider img{pointer-events:none}
.slider__btn{position:absolute;top:50%;transform:translateY(-50%);width:42px;height:42px;border:0;border-radius:50%;background:rgba(0,0,0,.45);color:#fff;font-size:22px;line-height:1;cursor:pointer;display:grid;place-items:center;transition:background .15s}
.slider__btn:hover{background:rgba(0,0,0,.7)}
.slider__btn--prev{left:10px}.slider__btn--next{right:10px}
.slider__dots{display:flex;justify-content:center;gap:7px;padding:0 0 14px}
.slider__dot{width:8px;height:8px;border-radius:50%;border:0;background:rgba(255,255,255,.35);cursor:pointer;padding:0;transition:background .15s}
.slider__dot.is-active{background:#fff}
@media(max-width:700px){
  .slider__btn{width:34px;height:34px;font-size:18px}
}

/* empty state */
.empty-state{text-align:center;padding:80px 24px;color:var(--muted)}
.empty-state p{font-size:16px}

/* 404 page */
.not-found{text-align:center;padding:80px 24px;min-height:50vh;display:flex;flex-direction:column;align-items:center;justify-content:center}
.not-found__code{font-size:96px;font-weight:800;color:var(--brand);line-height:1;margin-bottom:16px}
.not-found__title{font-size:28px;margin:0 0 12px;font-weight:700}
.not-found__desc{color:var(--muted);font-size:16px;margin:0 0 28px}
.btn-link{display:inline-block;padding:10px 24px;background:var(--brand);color:#fff;border-radius:8px;font-weight:600;text-decoration:none}
.btn-link:hover{background:var(--brand-dark);text-decoration:none}

/* ad slots */
.ad-slot{margin:20px 0;text-align:center;overflow:hidden;min-height:0}
.ad-slot--banner{margin:0 0 20px}
.ad-slot--article{margin:32px 0}

/* footer */
/* tag cloud (footer) */
.tag-cloud-wrap{padding:24px 0 8px}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.tag-cloud__label{font-size:13px;color:var(--muted);margin-right:4px}
.tag-cloud__item{font-size:13px;color:#4a5568;background:#eef0f4;border-radius:14px;padding:4px 12px;transition:background .12s}
.tag-cloud__item:hover{background:var(--brand);color:#fff;text-decoration:none}

/* article view count */
.article__views{margin-left:12px;color:var(--muted);font-size:14px}
.article__views::before{content:"👁 ";opacity:.6}

.site-footer{border-top:1px solid var(--line);background:#fff;padding:24px 0;margin-top:40px;color:var(--muted);font-size:14px}
.site-footer a{color:var(--muted)}

/* pagination */
.pager{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap;margin:36px 0 8px}
.pager__num,.pager__btn{display:inline-flex;align-items:center;justify-content:center;min-width:38px;height:38px;padding:0 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-weight:500;color:var(--fg);background:#fff;transition:all .12s}
.pager__num:hover,.pager__btn:hover{border-color:var(--brand);color:var(--brand);text-decoration:none}
.pager__num--active{background:var(--brand);border-color:var(--brand);color:#fff;cursor:default}
.pager__num--active:hover{color:#fff}
.pager__btn--disabled{color:#c3c8d0;cursor:not-allowed;background:#f7f8fa}
.pager__btn--disabled:hover{border-color:var(--line);color:#c3c8d0}

/* ---- Large screens (≥1200px): widen layout, double-column article cards ---- */
@media(min-width:1200px){
  /* List page: two-column article grid inside the main column, sidebar stays */
  .layout{grid-template-columns:1fr 320px;gap:40px}
  .post-list{display:grid;grid-template-columns:1fr 1fr;gap:0 28px}
  .post-row{border-bottom:1px solid var(--line)}
  .post-row__cover{width:140px}
  .post-row__title{font-size:18px}
}

/* ---- Extra-large screens (≥1600px): cap content width for readability ---- */
@media(min-width:1600px){
  :root{--maxw:1400px}
  .article{max-width:880px}
}

/* responsive */
/* Hamburger button — hidden on desktop, shown on mobile. */
.nav-toggle{display:none;width:40px;height:40px;border:0;background:transparent;cursor:pointer;padding:8px 7px;flex-direction:column;justify-content:space-between;align-items:stretch}
.nav-toggle span{display:block;height:2px;background:#3a4252;border-radius:2px;transition:transform .2s,opacity .2s}
.nav-toggle.is-active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-active span:nth-child(2){opacity:0}
.nav-toggle.is-active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media(max-width:700px){
  .site-main{padding:28px 18px 48px}
  .layout{grid-template-columns:1fr;gap:24px}
  .sidebar{position:static;flex-direction:row;flex-wrap:wrap;max-height:none;overflow:visible}
  .side-card{flex:1 1 100%}
  .article__title{font-size:30px}
  .article__content{font-size:17px}
  .page-title{font-size:24px}
  .post-row{gap:12px;padding:16px 0}
  .post-row__cover{width:110px}
  .post-row__title{font-size:17px}
  .post-row__summary{-webkit-line-clamp:1}
  .site-bar{height:56px}
  .brand{font-size:19px}
  /* Mobile: collapse nav into a dropdown toggled by the hamburger. */
  .nav-toggle{display:flex}
  .site-nav{
    position:absolute;top:56px;left:0;right:0;flex-direction:column;gap:0;
    background:#fff;border-bottom:1px solid var(--line);
    padding:0;margin:0;max-height:0;overflow:hidden;
    box-shadow:0 8px 24px rgba(18,31,52,.08);
    transition:max-height .2s ease;
  }
  .site-nav.is-open{max-height:340px;padding:8px 0}
  .site-nav a{display:block;padding:12px 24px;font-size:16px}
  .site-nav a:hover{background:#f3f5fa}
}