/* ─── 衡序 OS Blog styles ─── */
:root {
  --em-50:#ecfdf5;--em-100:#d1fae5;--em-200:#a7f3d0;--em-400:#34d399;--em-500:#10b981;
  --em-600:#059669;--em-700:#047857;--em-800:#065f46;--em-900:#064E3B;
  --bg:#fafafa;--card:#fff;--txt:#111827;--txt2:#6b7280;--txt3:#9ca3af;
  --line:#e5e7eb;--line2:#f3f4f6;
  --radius:14px;
  --maxw:720px;
  --font:'Noto Sans TC','PingFang TC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:var(--font);background:var(--bg);color:var(--txt);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}

/* Topbar */
.bl-topbar{position:sticky;top:0;z-index:50;display:flex;justify-content:space-between;align-items:center;padding:14px 24px;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bl-logo{display:flex;align-items:center;gap:8px;font-weight:900;font-size:17px;letter-spacing:-.01em}
.bl-logo-dot{width:10px;height:10px;border-radius:50%;background:var(--em-500)}
.bl-nav{display:flex;gap:20px;align-items:center}
.bl-nav a{font-size:14px;font-weight:600;color:var(--txt2);transition:color .15s}
.bl-nav a:hover{color:var(--txt)}
.bl-nav-active{color:var(--txt) !important}
.bl-nav-cta{padding:8px 16px;border-radius:8px;background:var(--em-500);color:#fff !important;transition:background .15s}
.bl-nav-cta:hover{background:var(--em-600)}

/* Article wrap */
.bl-article-wrap{max-width:var(--maxw);margin:0 auto;padding:32px 24px 80px}
.bl-breadcrumb{font-size:13px;color:var(--txt2);margin-bottom:24px}
.bl-breadcrumb a{color:var(--txt2);transition:color .15s}
.bl-breadcrumb a:hover{color:var(--em-700)}
.bl-breadcrumb span{margin:0 8px}
.bl-muted{color:var(--txt3) !important}

/* Hero (gradient cover) */
.bl-hero{position:relative;padding:44px 32px 36px;border-radius:var(--radius);background:linear-gradient(135deg,#047857 0%,#065f46 60%,#064E3B 100%);color:#fff;margin-bottom:32px;overflow:hidden}
.bl-hero::before{content:'';position:absolute;top:-80px;right:-80px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(16,185,129,.35),transparent 70%)}
.bl-hero::after{content:'';position:absolute;bottom:-60px;left:-40px;width:180px;height:180px;border-radius:50%;background:rgba(16,185,129,.08)}
.bl-hero > *{position:relative;z-index:1}
.bl-hero-label{display:inline-block;padding:5px 14px;border-radius:20px;background:rgba(255,255,255,.15);font-size:11px;font-weight:700;letter-spacing:.12em;margin-bottom:18px}
.bl-hero-title{font-size:34px;font-weight:900;line-height:1.35;margin:0 0 18px;letter-spacing:-.01em}
.bl-hero-meta{font-size:13px;color:rgba(255,255,255,.75);display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.bl-hero-dot{opacity:.5}
.bl-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.bl-tag{font-size:11px;padding:3px 10px;border-radius:12px;background:rgba(255,255,255,.14);color:#fff;font-weight:500}
.bl-hero .bl-tag{background:rgba(255,255,255,.16)}

/* Share row */
.bl-share{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:0 0 32px;padding:12px 0;border-bottom:1px solid var(--line)}
.bl-share-label{font-size:12px;color:var(--txt2);font-weight:600;margin-right:4px}
.bl-share-btn{display:inline-flex;align-items:center;justify-content:center;padding:6px 14px;border-radius:8px;font-size:12px;font-weight:600;background:var(--card);color:var(--txt2);border:1px solid var(--line);cursor:pointer;font-family:inherit;transition:all .15s;text-decoration:none}
.bl-share-btn:hover{border-color:var(--em-400);color:var(--em-800);background:var(--em-50)}
.bl-share-btn.bl-share-copied{border-color:var(--em-500);color:var(--em-700);background:var(--em-50)}

/* Article body — 長文可讀性優先 */
.bl-article{font-size:17px;line-height:1.85;color:var(--txt)}
.bl-article h2{font-size:26px;font-weight:800;margin:56px 0 18px;letter-spacing:-.01em;padding-top:4px;border-top:2px solid var(--line2)}
.bl-article h2:first-child{margin-top:0;border-top:none}
.bl-article h3{font-size:19px;font-weight:700;margin:36px 0 12px}
.bl-article p{margin:0 0 20px}
.bl-article ul,.bl-article ol{margin:0 0 20px;padding-left:1.4em}
.bl-article li{margin-bottom:8px}
.bl-article li > p{margin-bottom:8px}
.bl-article strong{font-weight:700;color:var(--em-800)}
.bl-article a{color:var(--em-700);text-decoration:underline;text-decoration-color:var(--em-200);text-underline-offset:3px;transition:all .15s}
.bl-article a:hover{color:var(--em-800);text-decoration-color:var(--em-500)}
.bl-article code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em;padding:2px 6px;background:var(--line2);border-radius:4px;color:var(--em-800)}
.bl-article pre{background:#0f1117;color:#e5e7eb;padding:18px 20px;border-radius:10px;overflow-x:auto;font-size:14px;line-height:1.65;margin:24px 0}
.bl-article pre code{background:transparent;padding:0;color:inherit}
.bl-article blockquote{margin:24px 0;padding:8px 0 8px 20px;border-left:4px solid var(--em-400);color:var(--txt2);font-style:normal}
.bl-article hr{border:none;border-top:1px solid var(--line);margin:48px 0}
.bl-article table{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px}
.bl-article th,.bl-article td{padding:10px 14px;border:1px solid var(--line);text-align:left}
.bl-article th{background:var(--em-50);font-weight:700;color:var(--em-800)}

/* FAQ */
.bl-faq{margin-top:56px;padding-top:36px;border-top:2px solid var(--line2)}
.bl-faq h2{font-size:22px;font-weight:800;margin:0 0 20px;letter-spacing:-.01em}
.bl-faq-item{border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin-bottom:10px;background:var(--card);transition:border-color .15s}
.bl-faq-item[open]{border-color:var(--em-300,#6ee7b7)}
.bl-faq-item summary{cursor:pointer;font-weight:700;font-size:15px;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.bl-faq-item summary::-webkit-details-marker{display:none}
.bl-faq-item summary::after{content:'+';font-size:22px;font-weight:400;color:var(--em-600);line-height:1;flex-shrink:0;transition:transform .2s}
.bl-faq-item[open] summary::after{transform:rotate(45deg)}
.bl-faq-ans{margin-top:12px;padding-top:12px;border-top:1px dashed var(--line);color:var(--txt2);font-size:15px;line-height:1.8}

/* Backlink */
.bl-backlink{margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
.bl-backlink a{color:var(--em-700);font-size:14px;font-weight:600}
.bl-backlink a:hover{color:var(--em-800)}

/* Footer */
.bl-footer{padding:32px 24px 40px;text-align:center;color:var(--txt2);font-size:13px;border-top:1px solid var(--line);background:var(--card)}
.bl-footer a{color:var(--em-700);font-weight:600}
.bl-footer > div{margin-bottom:4px}

.bl-loading{text-align:center;padding:48px 24px;color:var(--txt2);font-size:14px}
.bl-error{text-align:center;padding:48px 24px;color:var(--txt2);font-size:14px}
.bl-error a{color:var(--em-700);font-weight:600;text-decoration:underline}

/* ─── List page ─── */
.bl-list-wrap{max-width:1040px;margin:0 auto;padding:40px 24px 80px}
.bl-list-hero{padding:32px 0 48px;text-align:left;border-bottom:1px solid var(--line);margin-bottom:40px}
.bl-list-hero-label{display:inline-block;padding:5px 14px;border-radius:20px;background:var(--em-50);color:var(--em-800);font-size:11px;font-weight:700;letter-spacing:.12em;margin-bottom:16px}
.bl-list-hero h1{font-size:38px;font-weight:900;line-height:1.3;margin:0 0 16px;letter-spacing:-.01em}
.bl-list-hero p{font-size:16px;color:var(--txt2);line-height:1.8;margin:0;max-width:620px}

.bl-post-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media (min-width:720px){.bl-post-grid{grid-template-columns:repeat(2,1fr)}}

.bl-post-card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:all .2s;cursor:pointer}
.bl-post-card:hover{transform:translateY(-2px);border-color:var(--em-300,#6ee7b7);box-shadow:0 8px 24px rgba(16,185,129,.1)}
.bl-post-cover{position:relative;aspect-ratio:1200/630;background:linear-gradient(135deg,#047857 0%,#065f46 60%,#064E3B 100%);color:#fff;padding:24px;display:flex;align-items:flex-end;font-size:18px;font-weight:800;line-height:1.5;overflow:hidden}
.bl-post-cover::before{content:'';position:absolute;top:-40px;right:-40px;width:140px;height:140px;border-radius:50%;background:radial-gradient(circle,rgba(16,185,129,.35),transparent 70%)}
.bl-post-cover::after{content:'衡序 OS Blog';position:absolute;top:16px;left:16px;font-size:10px;letter-spacing:.12em;background:rgba(255,255,255,.15);padding:3px 10px;border-radius:12px;font-weight:700}
.bl-post-cover > span{position:relative;z-index:1}
.bl-post-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.bl-post-meta{font-size:12px;color:var(--txt2);margin-bottom:8px;font-weight:500}
.bl-post-body h2{font-size:19px;font-weight:800;margin:0 0 10px;line-height:1.5;letter-spacing:-.005em}
.bl-post-body p{font-size:14px;color:var(--txt2);line-height:1.7;margin:0 0 14px;flex:1}
.bl-post-body .bl-tags .bl-tag{background:var(--em-50);color:var(--em-800)}

/* Mobile tweaks */
@media (max-width:600px){
  .bl-hero-title{font-size:26px}
  .bl-hero{padding:32px 22px 28px}
  .bl-article{font-size:16px}
  .bl-article h2{font-size:22px;margin:40px 0 14px}
  .bl-article h3{font-size:17px}
  .bl-list-hero h1{font-size:28px}
  .bl-list-hero p{font-size:15px}
  .bl-topbar{padding:12px 16px}
  .bl-nav{gap:14px}
}