:root {
    --bg: #030712; --bg-s: #111827; --bg-sh: #1f2937;
    --c1: #f9fafb; --c2: #9ca3af; --c3: #6b7280;
    --blue: #3b82f6; --purple: #8b5cf6; --cyan: #06b6d4;
    --green: #10b981; --amber: #f59e0b;
    --blue-glow: rgba(59,130,246,.15);
    --border: rgba(255,255,255,.08); --border-h: rgba(59,130,246,.3);
    --font: 'Noto Sans TC', system-ui, sans-serif;
    --mono: 'JetBrains Mono', monospace;
    --tech: 'Space Grotesk', sans-serif;
    --ease: all .3s cubic-bezier(.4,0,.2,1);
    --r: 12px; --r2: 20px;
    --content-w: 760px;
}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:var(--font);background:var(--bg);color:var(--c1);line-height:1.8;overflow-x:clip;-webkit-font-smoothing:antialiased;}
a{text-decoration:none;color:var(--blue);}
a:hover{text-decoration:underline;}
ul,ol{padding-left:1.5em;}
.container{max-width:1280px;margin:0 auto;padding:0 24px;}
/* Ambient */
.ambient-bg{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;}
.glow-sphere{position:absolute;border-radius:50%;filter:blur(120px);opacity:.15;animation:float 20s infinite alternate ease-in-out;}
.glow-1{top:-10%;left:-10%;width:50vw;height:50vw;background:rgba(59,130,246,.18);}
.glow-2{bottom:-10%;right:-10%;width:40vw;height:40vw;background:rgba(139,92,246,.12);animation-delay:-5s;}
@keyframes float{0%{transform:translate(0,0)}100%{transform:translate(4%,4%)}}
/* Header */
#header{position:fixed;top:0;left:0;width:100%;z-index:100;background:rgba(3,7,18,.7);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);transition:background .3s ease,box-shadow .3s ease;}
.navbar{display:flex;justify-content:space-between;align-items:center;height:76px;}
.logo{font-family:var(--tech);font-size:26px;font-weight:700;display:flex;align-items:center;gap:10px;letter-spacing:-.5px;}
.logo-icon{width:36px;height:36px;object-fit:contain;flex-shrink:0;}
.nav-links{display:flex;gap:36px;align-items:center;}
.nav-links a{font-size:15px;font-weight:500;color:var(--c2);transition:var(--ease);}
.nav-links a:hover{color:var(--c1);}
.nav-links a.active{color:var(--blue);}
.lang-switch{position:relative;}
.lang-switch__btn{cursor:pointer;display:flex;align-items:center;gap:6px;font-size:13px;color:var(--c2);background:transparent;border:1px solid var(--border);border-radius:8px;padding:5px 10px;transition:var(--ease);white-space:nowrap;font-family:var(--font);}
.lang-switch__btn:hover{color:var(--c1);border-color:var(--border-h);}
.lang-switch__arrow{font-size:10px;transition:transform .2s ease;margin-left:2px;flex-shrink:0;}
.lang-switch.open .lang-switch__arrow{transform:rotate(180deg);}
.lang-switch__dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:164px;background:var(--bg-s);border:1px solid var(--border);border-radius:10px;padding:6px;box-shadow:0 8px 28px rgba(0,0,0,.5);opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .2s ease,transform .2s ease,visibility 0s .2s;z-index:200;}
.lang-switch.open .lang-switch__dropdown{opacity:1;visibility:visible;transform:translateY(0);transition:opacity .2s ease,transform .2s ease,visibility 0s;}
.lang-switch__option{display:flex;align-items:center;gap:10px;padding:8px 12px;border-radius:6px;font-size:13px;color:var(--c2);text-decoration:none;}
.lang-switch__option:hover{background:rgba(255,255,255,.05);color:var(--c1);}
.lang-switch__option--active{color:var(--blue);}
.lang-switch__option--active:hover{background:var(--blue-glow);}
.lang-switch__option--disabled{opacity:.45;cursor:not-allowed;pointer-events:none;}
.lang-switch__check{width:14px;flex-shrink:0;font-size:11px;color:var(--blue);}
.lang-switch__tag{margin-left:auto;font-size:10px;font-weight:700;padding:1px 6px;border-radius:4px;border:1px solid transparent;}
.lang-switch__tag--current{background:var(--blue-glow);border-color:rgba(59,130,246,.3);color:var(--blue);}
.lang-switch__tag--soon{background:rgba(107,114,128,.1);border-color:rgba(107,114,128,.2);color:var(--c3);}
.lang-switch--footer{display:flex;align-items:center;flex-wrap:wrap;gap:4px 6px;font-size:13px;color:var(--c2);}
.lang-switch--footer__sep{opacity:.35;}
.lang-switch--footer__alt{color:var(--c2);text-decoration:none;transition:color .2s;}
.lang-switch--footer__alt:hover{color:var(--blue);}
.menu-toggle{display:none;font-size:24px;cursor:pointer;}
/* ── Article layout ── */
.article-wrap{
    max-width:var(--content-w);
    margin:0 auto;
    padding:104px 24px 80px;
    position:relative;z-index:1;
}
/* Breadcrumb */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--c3);margin-bottom:32px;}
.breadcrumb a{color:var(--blue);text-decoration:none;}
.breadcrumb a:hover{text-decoration:underline;}
.breadcrumb i{font-size:10px;}
/* Article header */
.article-header{margin-bottom:40px;padding-bottom:32px;border-bottom:1px solid var(--border);}
.article-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:20px;}
.article-cat{font-size:12px;font-weight:700;padding:3px 12px;border-radius:100px;background:var(--blue-glow);border:1px solid rgba(59,130,246,.25);color:var(--blue);}
.article-date{font-size:13px;color:var(--c3);}
.article-title{font-size:36px;font-weight:900;line-height:1.3;letter-spacing:-.5px;margin-bottom:16px;}
.article-excerpt{font-size:17px;color:var(--c2);line-height:1.8;}
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;}
.tag{font-size:12px;color:var(--c3);background:rgba(255,255,255,.04);border:1px solid var(--border);border-radius:6px;padding:3px 10px;}
/* ── Article body ── */
.article-body{font-size:16px;line-height:1.9;color:var(--c2);word-break:break-word;overflow-wrap:break-word;}
.article-body h2{font-size:24px;font-weight:700;color:var(--c1);margin:40px 0 16px;padding-bottom:10px;border-bottom:1px solid var(--border);}
.article-body h3{font-size:19px;font-weight:700;color:var(--c1);margin:28px 0 12px;}
.article-body p{margin-bottom:16px;}
.article-body p:last-child{margin-bottom:0;}
.article-body strong{color:var(--c1);}
.article-body a{color:var(--blue);}
.article-body ul,.article-body ol{margin:12px 0 16px;display:flex;flex-direction:column;gap:6px;}
.article-body li{color:var(--c2);}
.article-body code{font-family:var(--mono);font-size:.85em;background:rgba(255,255,255,.08);padding:2px 7px;border-radius:4px;color:var(--cyan);}
/* Code block */
.article-body pre{
    background:#0d1117;border:1px solid rgba(255,255,255,.09);
    border-radius:var(--r2);padding:20px 22px;margin:16px 0;
    overflow-x:auto;
}
.article-body pre code{
    background:none;padding:0;border-radius:0;
    font-size:13px;line-height:1.7;color:#e2e8f0;
}
/* Tip / note boxes */
.tip{display:flex;align-items:flex-start;gap:12px;padding:14px 18px;border-radius:var(--r);margin:20px 0;font-size:14px;line-height:1.8;}
.tip--info{background:rgba(59,130,246,.07);border:1px solid rgba(59,130,246,.18);color:var(--c2);}
.tip--success{background:rgba(16,185,129,.07);border:1px solid rgba(16,185,129,.18);color:var(--c2);}
.tip--warn{background:rgba(245,158,11,.07);border:1px solid rgba(245,158,11,.18);color:var(--c2);}
.tip i{flex-shrink:0;margin-top:2px;}
.tip--info i{color:var(--blue);}
.tip--success i{color:var(--green);}
.tip--warn i{color:var(--amber);}
.tip strong{color:var(--c1);}
/* Step list */
.step-list{display:flex;flex-direction:column;gap:0;margin:16px 0;}
.step{display:flex;gap:16px;padding-bottom:24px;position:relative;}
.step:not(:last-child)::before{content:'';position:absolute;left:15px;top:36px;bottom:0;width:2px;background:linear-gradient(to bottom,var(--border-h),var(--border));}
.step-num{width:32px;height:32px;border-radius:50%;background:var(--blue-glow);border:1.5px solid rgba(59,130,246,.4);color:var(--blue);font-family:var(--tech);font-weight:700;font-size:13px;display:flex;align-items:center;justify-content:center;flex-shrink:0;position:relative;z-index:1;}
.step-body{flex:1;padding-top:4px;}
.step-body h4{font-size:16px;font-weight:700;color:var(--c1);margin-bottom:6px;}
.step-body p{font-size:14px;color:var(--c2);line-height:1.8;}
/* ── Download CTA card ── */
.dl-cta{
    margin-top:56px;padding:36px 40px;border-radius:var(--r2);position:relative;overflow:hidden;
    background:linear-gradient(135deg,rgba(59,130,246,.12) 0%,rgba(139,92,246,.10) 100%);
    border:1px solid rgba(59,130,246,.25);
}
.dl-cta::before{
    content:'';position:absolute;inset:0;
    background:radial-gradient(ellipse at 80% 50%,rgba(59,130,246,.08) 0%,transparent 70%);
    pointer-events:none;
}
.dl-cta-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;position:relative;z-index:1;}
.dl-cta-text h3{font-size:20px;font-weight:700;color:var(--c1);margin-bottom:8px;}
.dl-cta-text p{font-size:14px;color:var(--c2);line-height:1.7;max-width:420px;}
.dl-cta-btn{
    display:inline-flex;align-items:center;gap:10px;padding:13px 28px;
    background:linear-gradient(135deg,#2563eb,#7c3aed);border-radius:var(--r);
    font-size:15px;font-weight:700;color:#ffffff !important;white-space:nowrap;flex-shrink:0;
    transition:var(--ease);text-decoration:none;box-shadow:0 4px 20px rgba(59,130,246,.35);
    letter-spacing:.3px;
}
.dl-cta-btn:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(59,130,246,.5);text-decoration:none;color:#ffffff !important;}
/* ── Floating download widget ── */
.dl-float{
    position:fixed;bottom:32px;right:28px;z-index:500;
}
.dl-float-card{
    display:flex;flex-direction:column;gap:0;
    width:200px;border-radius:20px;overflow:hidden;
    box-shadow:0 12px 40px rgba(0,0,0,.5),0 0 0 1px rgba(59,130,246,.25);
    background:var(--bg-s);
    animation:float-in .4s cubic-bezier(.34,1.56,.64,1) both;
}
@keyframes float-in{from{opacity:0;transform:translateY(20px) scale(.92)}to{opacity:1;transform:none}}
.dl-float-top{
    padding:18px 18px 14px;
    background:linear-gradient(135deg,#1e3a8a 0%,#4c1d95 100%);
    position:relative;overflow:hidden;
}
.dl-float-top::before{
    content:'';position:absolute;top:-30px;right:-20px;
    width:100px;height:100px;border-radius:50%;
    background:rgba(255,255,255,.06);
}
.dl-float-icon{
    width:44px;height:44px;border-radius:12px;
    background:rgba(255,255,255,.15);backdrop-filter:blur(8px);
    display:flex;align-items:center;justify-content:center;
    margin-bottom:12px;border:1px solid rgba(255,255,255,.2);
}
.dl-float-icon i{font-size:20px;color:#fff;}
.dl-float-title{font-size:15px;font-weight:700;color:#fff;line-height:1.3;margin-bottom:4px;}
.dl-float-sub{font-size:11px;color:rgba(255,255,255,.6);letter-spacing:.2px;}
.dl-float-bottom{
    padding:12px 14px;display:flex;flex-direction:column;gap:8px;
    background:var(--bg-s);border-top:1px solid rgba(255,255,255,.06);
}
.dl-float-btn{
    display:flex;align-items:center;justify-content:center;gap:8px;
    padding:10px;border-radius:10px;font-size:13px;font-weight:700;
    color:#fff !important;text-decoration:none;transition:var(--ease);
    background:linear-gradient(135deg,#2563eb,#7c3aed);
    box-shadow:0 3px 12px rgba(59,130,246,.4);letter-spacing:.2px;
}
.dl-float-btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(59,130,246,.55);color:#fff !important;text-decoration:none;}
.dl-float-hint{font-size:11px;color:var(--c3);text-align:center;}
/* Footer */
footer{background:#020408;border-top:1px solid var(--border);padding:48px 0 32px;position:relative;z-index:1;}
.footer-grid{display:grid;grid-template-columns:2.5fr 1fr 1fr 1fr;gap:48px;margin-bottom:40px;}
.footer-brand p{color:var(--c2);font-size:14px;margin-top:16px;max-width:320px;line-height:1.8;}
.footer-title{font-size:15px;font-weight:600;margin-bottom:18px;color:var(--c1);}
.footer-links li{margin-bottom:11px;}
.footer-links a{color:var(--c2);font-size:13px;transition:var(--ease);}
.footer-links a:hover{color:var(--blue);}
.footer-bottom{padding-top:24px;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;color:var(--c3);font-size:13px;flex-wrap:wrap;gap:12px;}
.footer-bottom-right{display:flex;flex-direction:column;align-items:flex-end;gap:10px;}
.footer-bottom-links{display:flex;gap:20px;flex-wrap:wrap;justify-content:flex-end;}
.footer-bottom-links a{color:var(--c3);font-size:13px;transition:var(--ease);text-decoration:none;}
.footer-bottom-links a:hover{color:var(--c2);}
/* Responsive */
@media(max-width:768px){
    footer{padding:36px 0 24px;}
    .footer-grid{margin-bottom:24px;}
    .footer-brand p{font-size:13px;margin-top:10px;}
    .footer-title{font-size:14px;margin-bottom:12px;}
    .nav-links{display:none;}
    .menu-toggle{display:block;}
    .navbar{height:60px;}
    .logo{font-size:20px;gap:8px;}
    .logo-icon{width:28px;height:28px;}
    .nav-actions{display:flex;align-items:center;gap:10px;}
    .lang-switch__btn .lang-label{display:none;}.lang-switch__btn{padding:5px 8px;gap:4px;}
    .menu-toggle{display:flex;align-items:center;justify-content:center;width:36px;height:36px;flex-shrink:0;font-size:20px;}
    .nav-links.mobile-active{display:flex;flex-direction:column;position:absolute;top:60px;left:0;width:100%;background:var(--bg-s);padding:20px 16px;border-bottom:1px solid var(--border);z-index:100;}
    .article-wrap{padding:80px 16px 56px;}
    .article-title{font-size:24px;letter-spacing:-.3px;}
    .article-excerpt{font-size:15px;}
    .article-body h2{font-size:19px;}
    .article-body h3{font-size:16px;}
    .article-body{font-size:15px;}
    .article-body pre{padding:14px;border-radius:12px;}
    .article-body pre code{font-size:12px;}
    .dl-cta{padding:24px 18px;}
    .dl-cta-inner{flex-direction:column;align-items:flex-start;}
    .dl-cta-btn{width:100%;justify-content:center;}
    .dl-float{bottom:16px;left:16px;right:16px;width:auto;}
    .dl-float-card{width:100%;flex-direction:row;align-items:stretch;border-radius:16px;}
    .dl-float-top{flex:1;padding:12px 14px;display:flex;flex-direction:row;align-items:center;gap:10px;}
    .dl-float-top::before{display:none;}
    .dl-float-icon{width:36px;height:36px;border-radius:10px;flex-shrink:0;margin-bottom:0;}
    .dl-float-icon i{font-size:15px;}
    .dl-float-title{font-size:13px;margin-bottom:0;white-space:nowrap;}
    .dl-float-sub{display:none;}
    .dl-float-bottom{padding:10px 14px;border-top:none;border-left:1px solid rgba(255,255,255,.08);display:flex;flex-direction:column;justify-content:center;gap:0;flex-shrink:0;}
    .dl-float-hint{display:none;}
    .dl-float-btn{padding:8px 16px;font-size:12px;white-space:nowrap;border-radius:8px;}
    .footer-grid{grid-template-columns:1fr;gap:28px;}
    .footer-bottom{flex-direction:column;justify-content:flex-start;align-items:center;gap:22px;text-align:center;}
    .footer-bottom>p{flex:none;}
    .footer-bottom-right{flex-direction:row;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;}
    .footer-bottom-links{justify-content:center;flex-wrap:wrap;gap:14px;}
}
@media(max-width:480px){
    .article-wrap{padding:90px 14px 48px;}
    .article-title{font-size:20px;}
    .article-body h2{font-size:17px;}
    .article-body pre code{font-size:11px;}
    .step-num{width:26px;height:26px;font-size:12px;}
    .dl-float{bottom:12px;left:12px;right:12px;}
}
#header .lang-switch{display:none !important;}