:root{--bg:#fafafa;--fg:#222;--accent:#2350a9;--muted:#666;--border:#ddd;--surface:#fff;--tag-bg:#eef2fb;--tag-bg-hover:#dde6f8}:root[data-theme=dark]{--bg:#14181f;--fg:#e6e6e6;--accent:#6ea8ff;--muted:#9aa4b2;--border:#333a45;--surface:#1c2129;--tag-bg:#1f2937;--tag-bg-hover:#26313f}*{box-sizing:border-box}body{background:var(--bg);color:var(--fg);margin:0;font-family:Noto Serif TC,Songti TC,PMingLiU,serif;line-height:1.6}header{border-bottom:1px solid var(--border);background:var(--surface);justify-content:space-between;align-items:center;gap:1rem;padding:1rem 1.5rem;display:flex}.header-left{flex:1;min-width:0}.site-title{margin:0 0 .5rem;font-size:1.2rem}nav a{color:var(--accent);margin-right:1rem;font-weight:600;text-decoration:none}nav a:hover{text-decoration:underline}.theme-toggle{border:1px solid var(--border);background:var(--bg);color:var(--fg);cursor:pointer;border-radius:6px;flex-shrink:0;padding:.4rem .7rem;font-size:.9rem}.theme-toggle:hover{background:var(--tag-bg)}main{max-width:720px;margin:0 auto;padding:1.5rem}details{border:1px solid var(--border);background:var(--surface);border-radius:6px;margin-bottom:.5rem}summary{cursor:pointer;padding:.6rem 1rem;font-weight:600}details ul{margin:0;padding:.5rem 1rem 1rem 2rem}ul{padding-left:1.5rem}li{margin-bottom:.3rem}a{color:var(--accent)}.tag-filter{border:1px solid var(--border);background:var(--surface);width:100%;color:var(--fg);border-radius:4px;margin-bottom:1rem;padding:.5rem;font-size:1rem}.meta{color:var(--muted);font-size:.9rem}.tags{margin:.5rem 0 1.5rem}.tag{background:var(--tag-bg);color:var(--accent);border-radius:12px;margin:0 .3rem .3rem 0;padding:.15rem .6rem;font-size:.85rem;text-decoration:none;display:inline-block}.tag:hover{background:var(--tag-bg-hover)}.article-body{font-size:1.2em}