/* Article page shared styles */
:root{--brand:#35bfab;--brand2:#1fc9e7;--brand3:#7c3aed;--primary:#334f52;--secondary:#7b888e;--bg:#eee;--card:rgba(255,255,255,0.45);--cb:rgba(255,255,255,0.8);--radius:40px}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC",-apple-system,system-ui,"Segoe UI",Roboto,Ubuntu,"Noto Sans",sans-serif;background:var(--bg);color:var(--primary);line-height:1.8;-webkit-font-smoothing:antialiased}
nav{background:rgba(255,255,255,0.7);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--cb);position:sticky;top:0;z-index:100}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:0 32px;height:64px;max-width:1200px;margin:0 auto}
.nav-brand{font-size:1.05rem;font-weight:700;letter-spacing:-0.3px;color:var(--primary);text-decoration:none}
.nav-brand span{color:var(--brand)}
.nav-links{display:flex;gap:24px;list-style:none;align-items:center}
.nav-links a{color:var(--secondary);font-size:0.85rem;font-weight:500;text-decoration:none;transition:color .2s}
.nav-links a:hover{color:var(--brand)}
.nav-links .active{color:var(--primary);font-weight:600}
.nav-cta{background:var(--brand);color:#fff!important;padding:6px 18px;border-radius:10px;font-size:0.8rem;font-weight:600!important}

/* article wrapper */
.article-wrap{max-width:760px;margin:0 auto;padding:40px 24px 60px}

/* article meta */
.article-header{margin-bottom:40px}
.article-tags{display:flex;gap:8px;margin-bottom:14px}
.article-tag{font-size:0.72rem;font-weight:600;color:var(--brand);background:rgba(53,191,171,0.1);padding:4px 12px;border-radius:8px}
.article-header h1{font-size:clamp(1.5rem,3vw,2rem);font-weight:800;line-height:1.3;letter-spacing:-0.02em;margin-bottom:10px}
.article-meta{display:flex;gap:16px;font-size:0.82rem;color:var(--secondary)}
.article-cover{margin:20px 0 32px;background:linear-gradient(135deg,#0f172a,#1e293b);border-radius:24px;min-height:200px;display:flex;align-items:center;justify-content:center;font-size:4rem;position:relative;overflow:hidden}
.article-cover::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 50%,rgba(53,191,171,0.12),transparent 60%)}

/* article content */
.article-content{background:var(--card);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--cb);border-radius:var(--radius);padding:40px 44px;box-shadow:0 40px 50px -32px rgba(0,0,0,0.05)}
.article-content h2{font-size:1.25rem;font-weight:700;margin:32px 0 14px;padding-bottom:8px;border-bottom:2px solid rgba(53,191,171,0.15)}
.article-content h2:first-child{margin-top:0}
.article-content h3{font-size:1.05rem;font-weight:600;margin:24px 0 10px;color:var(--brand)}
.article-content p{margin-bottom:16px;font-size:0.95rem;color:#3d4a4d;line-height:1.9}
.article-content ul,.article-content ol{padding-left:24px;margin-bottom:16px}
.article-content li{margin-bottom:8px;font-size:0.95rem;color:#3d4a4d}
.article-content strong{font-weight:600;color:var(--primary)}
.article-content blockquote{border-left:3px solid var(--brand);padding:12px 20px;margin:20px 0;background:rgba(53,191,171,0.05);border-radius:0 12px 12px 0;color:var(--secondary);font-size:0.9rem}
.article-content table{width:100%;border-collapse:collapse;margin:20px 0;font-size:0.88rem;border-radius:12px;overflow:hidden}
.article-content th{background:rgba(53,191,171,0.1);padding:12px 16px;text-align:left;font-weight:600}
.article-content td{padding:12px 16px;border-bottom:1px solid rgba(0,0,0,0.06)}
.article-content tr:last-child td{border-bottom:none}
.article-content code{background:rgba(0,0,0,0.04);padding:2px 8px;border-radius:6px;font-size:0.85em;font-family:"SF Mono","Fira Code","Consolas",monospace}
.article-content pre{background:#1a1c2e;color:#e4e4e7;padding:20px 24px;border-radius:16px;overflow-x:auto;margin:20px 0;font-size:0.85rem;line-height:1.6}
.article-content pre code{background:none;padding:0;color:inherit;font-size:inherit}
.article-content img{max-width:100%;border-radius:12px;margin:20px 0}

/* article footer */
.article-footer{margin-top:32px;padding-top:24px;border-top:1px solid var(--cb)}
.article-nav{display:flex;justify-content:space-between;gap:20px}
.article-nav a{flex:1;padding:16px 20px;background:var(--card);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);border:1px solid var(--cb);border-radius:16px;text-decoration:none;color:var(--primary);transition:all .25s}
.article-nav a:hover{background:rgba(255,255,255,0.7);border-color:var(--brand)}
.article-nav .nav-label{font-size:0.72rem;color:var(--secondary);margin-bottom:4px}
.article-nav .nav-title{font-size:0.88rem;font-weight:600}
.article-nav .nav-next{text-align:right}
.article-nav a:only-child{text-align:center}

/* back link */
.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--secondary);text-decoration:none;font-size:0.85rem;margin-bottom:24px;transition:color .2s}
.back-link:hover{color:var(--brand)}

/* responsive */
@media(max-width:640px){
.article-content{padding:24px 20px;border-radius:28px}
.article-wrap{padding:24px 16px 40px}
.nav-inner{padding-left:16px;padding-right:16px}
.article-nav{flex-direction:column}
.article-nav .nav-next{text-align:left}
}

/* fade-in */
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeUp .5s cubic-bezier(0.16,1,0.3,1) both}