:root{--fg:#1b1b1b;--muted:#6b6b6b;--line:#e3e3e3;--accent:#1f5f8b;--bg:#fff}
*{box-sizing:border-box}
body{margin:0;font:16px/1.7 "Noto Sans TC",system-ui,sans-serif;color:var(--fg);background:var(--bg)}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.site-header{display:flex;gap:1.5rem;align-items:center;padding:1rem 1.5rem;border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:1.1rem;color:var(--fg)}
nav{display:flex;gap:1.25rem}
main{max-width:64rem;margin:0 auto;padding:2rem 1.5rem}
.hero h1{margin:0 0 .25rem;font-size:1.75rem}
.hero p{margin:0;color:var(--muted)}
.news{margin-top:2.5rem}
.news ul{list-style:none;padding:0;margin:0}
.news li{padding:.6rem 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:1rem}
.news time{color:var(--muted);font-size:.9rem;white-space:nowrap}
.empty{color:var(--muted)}
.site-footer{max-width:64rem;margin:3rem auto 2rem;padding:1rem 1.5rem;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
.system-page main{max-width:34rem;padding-top:4rem;text-align:center}
.tag{display:inline-block;font-size:.72rem;line-height:1.5;padding:0 .4rem;border-radius:3px;background:#eef4f9;color:var(--accent);border:1px solid #cfe0ee;vertical-align:.08em}
.news li,.news-list li{align-items:center}
.thumb{width:96px;height:64px;object-fit:cover;border-radius:4px;border:1px solid var(--line);flex:0 0 auto}

/* ── 單篇公告（ADR-0027） ───────────────────────────────── */
.post h1{font-size:1.6rem;margin:0 0 .5rem;line-height:1.4}
.post-meta{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap;color:var(--muted);font-size:.9rem;margin:0 0 1.5rem}
.post-summary{font-weight:600;margin:0 0 1.5rem}
.post-body{overflow-wrap:anywhere}
.post-body img{max-width:100%;height:auto}
.post-back{margin-top:3rem;border-top:1px solid var(--line);padding-top:1rem}

.gallery{margin-top:2.5rem}
.gallery h2,.files h2{font-size:1.05rem;margin:0 0 .75rem}
.gallery ul{list-style:none;padding:0;margin:0;display:grid;gap:1rem;
  grid-template-columns:repeat(auto-fill,minmax(9rem,1fr))}
.gallery li{margin:0}
.gallery-thumb{display:block;aspect-ratio:4/3;overflow:hidden;border:1px solid var(--line);border-radius:4px}
.gallery-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.gallery-caption{margin:.4rem 0 0;font-size:.85rem;color:var(--muted);line-height:1.4}

/* 放大檢視用 :target，完全不需要 JavaScript。
   關掉 JS 的瀏覽器一樣點得開，而且每張圖有自己的網址可以分享。 */
.lightbox{display:none}
.lightbox:target{display:flex;position:fixed;inset:0;z-index:50;
  align-items:center;justify-content:center;padding:2rem;
  background:rgba(0,0,0,.92)}
.lightbox figure{margin:0;max-width:100%;max-height:100%;text-align:center}
.lightbox img{max-width:100%;max-height:80vh;object-fit:contain}
.lightbox figcaption{color:#f2f2f2;margin-top:.75rem;font-size:.9rem}
.lightbox-close{position:absolute;top:1rem;right:1.25rem;color:#fff;
  font-size:2rem;line-height:1;text-decoration:none}
.lightbox-close:hover{text-decoration:none;opacity:.7}

.files{margin-top:2.5rem}
.files ul{list-style:none;padding:0;margin:0}
.files li{display:flex;gap:.75rem;align-items:center;padding:.55rem 0;border-bottom:1px solid var(--line)}
.file-size{color:var(--muted);font-size:.85rem;white-space:nowrap}

.gallery .muted,.post .muted{color:var(--muted);font-size:.88rem;margin:0 0 .75rem}