:root{
    --bg:#0c0c11; --bg2:#101017; --panel:#17171f; --panel2:#1d1d27; --panelhi:#232330;
    --line:rgba(255,255,255,.07); --line2:rgba(255,255,255,.12);
    --text:#f2f0f7; --muted:#a3a3b0; --dim:#70707e;
    --p1:#667eea; --p2:#764ba2;
    --grad:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
    --good:#28a745; --warn:#ffc107; --bad:#dc3545; --info:#37b6c9;
    --radius:16px; --side:296px;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{margin:0;background:var(--bg);color:var(--text);
    font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:15.5px;line-height:1.65;-webkit-font-smoothing:antialiased}
  h1,h2,h3,h4{font-family:'Sora','Inter',sans-serif;line-height:1.22;margin:0;letter-spacing:-.3px}
  a{color:#9fb0ff;text-decoration:none}a:hover{text-decoration:underline}

  .sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--side);background:var(--bg2);border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:40}
  .brand{padding:18px 20px 14px;border-bottom:1px solid var(--line);cursor:pointer;display:flex;align-items:center;gap:10px}
  .brand img{height:30px;width:auto;display:block}
  .brand .hc{font-family:'Sora';font-size:12.5px;color:var(--dim);font-weight:600;border-left:1px solid var(--line2);padding-left:10px}
  .search{padding:13px 15px;border-bottom:1px solid var(--line);position:relative}
  .search input{width:100%;background:var(--panel);border:1px solid var(--line2);color:var(--text);border-radius:11px;padding:10px 12px 10px 34px;font-size:13.5px;outline:none}
  .search input:focus{border-color:var(--p1);box-shadow:0 0 0 3px rgba(102,126,234,.18)}
  .search .mag{position:absolute;left:26px;top:23px;color:var(--dim);font-size:13px;pointer-events:none}
  .results{position:absolute;left:15px;right:15px;top:52px;background:var(--panel2);border:1px solid var(--line2);border-radius:12px;box-shadow:0 20px 50px rgba(0,0,0,.5);overflow:hidden;z-index:60;display:none}
  .results.on{display:block}
  .results a{display:block;padding:10px 13px;color:var(--text);font-size:13.5px;border-bottom:1px solid var(--line)}
  .results a:last-child{border-bottom:none}.results a:hover{background:var(--panelhi);text-decoration:none}
  .results a small{display:block;color:var(--dim);font-size:11px}.results .none{padding:12px 13px;color:var(--dim);font-size:13px}
  .nav{overflow-y:auto;padding:10px 10px 40px;flex:1}
  .nav::-webkit-scrollbar{width:8px}.nav::-webkit-scrollbar-thumb{background:var(--line2);border-radius:8px}
  .nav .grp{color:var(--dim);font-size:10.5px;font-weight:700;letter-spacing:1.3px;text-transform:uppercase;padding:15px 12px 6px}
  .nav a{display:flex;align-items:center;gap:9px;color:var(--muted);padding:7px 12px;border-radius:10px;font-size:13.6px;font-weight:500}
  .nav a .ni{width:18px;text-align:center;font-size:14px;opacity:.9}
  .nav a:hover{background:var(--panel);color:var(--text);text-decoration:none}
  .nav a.active{background:var(--grad);color:#fff;box-shadow:0 6px 18px rgba(118,75,162,.4)}
  .nav a.active .ni{opacity:1}.nav a.hidden{display:none}

  main{margin-left:var(--side);min-height:100vh}
  .topbar{position:sticky;top:0;background:rgba(12,12,17,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);padding:13px 40px;z-index:30;display:flex;align-items:center;gap:14px}
  .crumb{color:var(--dim);font-size:13px}.crumb b{color:var(--muted);font-weight:600}
  .menu-btn{display:none}
  .wrap{max-width:1240px;margin:0 auto;padding:0 40px 120px}

  .view{display:none}.view.on{display:block;animation:fade .28s ease}
  @keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

  /* Home */
  .hero{padding:54px 0 30px;text-align:center;border-bottom:1px solid var(--line);margin-bottom:10px}
  .hero .logo{height:56px;margin-bottom:22px}
  .hero h1{font-size:40px;margin:0 0 12px}
  .hero p{color:var(--muted);font-size:17px;max-width:640px;margin:0 auto 26px}
  .herosearch{max-width:600px;margin:0 auto;position:relative}
  .herosearch input{width:100%;background:var(--panel);border:1px solid var(--line2);color:var(--text);border-radius:14px;padding:15px 16px 15px 46px;font-size:15.5px;outline:none}
  .herosearch input:focus{border-color:var(--p1);box-shadow:0 0 0 4px rgba(102,126,234,.18)}
  .herosearch .mag{position:absolute;left:18px;top:16px;color:var(--dim)}
  .herosearch .results{left:0;right:0;top:60px}
  .cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(288px,1fr));gap:18px;padding:34px 0 10px}
  .card{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 22px 20px;text-decoration:none;color:inherit;transition:border-color .15s,transform .15s,box-shadow .15s}
  .card:hover{border-color:var(--line2);transform:translateY(-2px);box-shadow:0 16px 40px rgba(0,0,0,.35)}
  .card:hover h3{color:var(--text)}
  .card:hover .ccount{color:#c3ccff}
  .card .ch{display:flex;align-items:center;gap:11px;margin-bottom:12px}
  .card .cico{flex:none;width:40px;height:40px;border-radius:11px;display:grid;place-items:center;font-size:20px;background:var(--panel2);border:1px solid var(--line2)}
  .card h3{font-size:16.5px;transition:color .15s}
  .card p{color:var(--muted);font-size:13.6px;line-height:1.55;margin:0 0 16px;flex:1}
  .card .ccount{color:#9fb0ff;font-size:12.5px;font-weight:600;letter-spacing:.02em;transition:color .15s}

  /* Article — two columns: content + on-this-page rail */
  .article{display:grid;grid-template-columns:minmax(0,1fr) 232px;gap:56px;align-items:start;padding-top:34px}
  .acol{min-width:0}
  .atoc{position:sticky;top:80px}
  .atoc-h{font-size:10.5px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;color:var(--dim);margin-bottom:10px}
  .atoc nav a{display:block;color:var(--muted);font-size:13px;padding:5px 0 5px 13px;border-left:2px solid var(--line)}
  .atoc nav a:hover{color:var(--text);border-left-color:var(--p1);text-decoration:none}
  .atoc nav a.sub{padding-left:26px;font-size:12.5px;color:var(--dim)}
  .abreadcrumb{color:var(--dim);font-size:12.5px;margin-bottom:14px}
  .acol h1{font-size:33px;margin:0 0 6px;display:flex;align-items:center;gap:13px}
  .acol h1 .ico{width:44px;height:44px;border-radius:12px;background:var(--panel2);border:1px solid var(--line2);display:grid;place-items:center;font-size:22px;flex:none}
  .lead{color:var(--muted);font-size:17px;margin:10px 0 22px}
  .acol h2{font-size:21px;margin:38px 0 12px;scroll-margin-top:82px}
  .acol h3{font-size:16.5px;margin:26px 0 10px;scroll-margin-top:82px}
  .acol h3.howto{display:flex;align-items:center;gap:9px}
  .acol h3.howto::before{content:"HOW TO";font-family:'Inter';font-size:10px;font-weight:700;letter-spacing:1px;color:#fff;background:var(--grad);padding:3px 8px;border-radius:6px}
  .acol p{color:var(--muted)}

  figure{margin:22px 0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 18px 44px rgba(0,0,0,.4)}
  figure .bar{display:flex;align-items:center;gap:7px;padding:10px 14px;background:var(--panel2);border-bottom:1px solid var(--line)}
  figure .bar i{width:11px;height:11px;border-radius:50%;display:inline-block}
  .d1{background:#ff5f57}.d2{background:#febc2e}.d3{background:#28c840}
  figure .bar span{margin-left:8px;color:var(--dim);font-size:12px}
  figure img{display:block;width:100%;cursor:zoom-in}
  figcaption{padding:10px 14px;color:var(--dim);font-size:12.5px;background:var(--panel2);border-top:1px solid var(--line)}

  ol.steps{list-style:none;counter-reset:s;padding:0;margin:16px 0}
  ol.steps li{counter-increment:s;position:relative;padding:9px 0 9px 44px;border-bottom:1px dashed var(--line);color:var(--muted)}
  ol.steps li:last-child{border-bottom:none}
  ol.steps li::before{content:counter(s);position:absolute;left:0;top:8px;width:28px;height:28px;background:var(--grad);color:#fff;border-radius:8px;display:grid;place-items:center;font-weight:700;font-size:13px}
  ol.steps li b{color:var(--text)}
  ul.feat{list-style:none;padding:0;margin:14px 0}
  ul.feat li{position:relative;padding:7px 0 7px 24px;color:var(--muted)}
  ul.feat li::before{content:"";position:absolute;left:2px;top:14px;width:7px;height:7px;border-radius:50%;background:var(--p1)}
  ul.feat li b{color:var(--text)}

  .callout{display:flex;gap:12px;background:var(--panel);border:1px solid var(--line2);border-left:3px solid var(--p1);border-radius:12px;padding:14px 16px;margin:18px 0;font-size:14px}
  .callout.tip{border-left-color:var(--good)}.callout.warn{border-left-color:var(--warn)}.callout.who{border-left-color:var(--info)}.callout.detail{border-left-color:#a06bf0}
  .callout .k{font-weight:700;color:var(--text)}.callout p{margin:0;color:var(--muted)}
  .callout.who .k{color:var(--info)}.callout.detail .k{color:#c09bff}

  .chips{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
  /* consistent vertical rhythm — one predictable gap between every block */
  .acol>*{margin-top:0;margin-bottom:20px}
  .acol>.abreadcrumb{margin-bottom:14px}
  .acol>h1{margin-bottom:8px}
  .acol>p.lead{margin-bottom:26px}
  .acol>h2{margin-top:44px;margin-bottom:14px}
  .acol>h3{margin-top:32px;margin-bottom:12px}
  .acol>figure{margin:0 0 20px}
  .acol>ul,.acol>ol{margin:0 0 20px}
  .acol>.callout{margin:0 0 20px}
  .acol>.chips{margin:0 0 20px}
  .acol>p{margin:0 0 20px}
  .acol>*:last-child{margin-bottom:0}
  .chip{font-size:12px;font-weight:600;padding:4px 10px;border-radius:20px;border:1px solid var(--line2)}
  .chip.g{color:#4ade80;border-color:rgba(40,167,69,.5);background:rgba(40,167,69,.12)}
  .chip.w{color:#fbcf5c;border-color:rgba(255,193,7,.5);background:rgba(255,193,7,.12)}
  .chip.b{color:#f87171;border-color:rgba(220,53,69,.5);background:rgba(220,53,69,.12)}
  .chip.i{color:#5cc9d8;border-color:rgba(55,182,201,.5);background:rgba(55,182,201,.12)}

  .pager{display:flex;justify-content:space-between;gap:14px;margin:44px 0 0;padding:22px 0 0;border-top:1px solid var(--line)}
  .pager a{flex:1;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:13px 16px;color:var(--text);font-size:14px}
  .pager a:hover{border-color:var(--line2);text-decoration:none;background:var(--panelhi)}
  .pager a small{display:block;color:var(--dim);font-size:11px;margin-bottom:2px}
  .pager a.next{text-align:right}.pager a.blank{visibility:hidden}

  .footer{margin-left:var(--side);padding:24px 40px;border-top:1px solid var(--line);color:var(--dim);font-size:13px}
  .lb{position:fixed;inset:0;background:rgba(4,4,7,.92);display:none;align-items:center;justify-content:center;z-index:100;padding:30px;cursor:zoom-out}
  .lb.open{display:flex}.lb img{max-width:100%;max-height:100%;border-radius:12px;box-shadow:0 30px 80px rgba(0,0,0,.7)}

  @media(max-width:1120px){ .article{grid-template-columns:1fr} .atoc{display:none} }
  @media(max-width:960px){
    :root{--side:0px}
    .sidebar{transform:translateX(-100%);transition:transform .25s;width:280px}.sidebar.open{transform:none}
    main,.footer{margin-left:0}.topbar,.wrap{padding-left:20px;padding-right:20px}
    .menu-btn{display:inline-flex;background:var(--panel);border:1px solid var(--line2);color:var(--text);border-radius:9px;padding:7px 12px;font-size:13px;cursor:pointer}
    .hero h1{font-size:29px}.acol h1{font-size:26px}
  }