:root{
  --bg:#f7f8fb; --surface:#ffffff; --surface-2:#eef1f7; --border:#dde2ec;
  --text:#1d2333; --muted:#5b6478; --accent:#4c6ef5; --accent-2:#3b5bdb;
  --accent-soft:#e8edff; --code-bg:#eef1f7; --shadow:0 1px 2px rgba(20,30,60,.06),0 8px 24px rgba(20,30,60,.07);
  --maxw:900px; --sidebar:264px;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0e1017; --surface:#161a24; --surface-2:#1c212e; --border:#2a3040;
    --text:#e6e9f2; --muted:#9aa4bd; --accent:#7a8cff; --accent-2:#9db0ff;
    --accent-soft:#1b2135; --code-bg:#1c212e;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --bg:#0e1017; --surface:#161a24; --surface-2:#1c212e; --border:#2a3040;
  --text:#e6e9f2; --muted:#9aa4bd; --accent:#7a8cff; --accent-2:#9db0ff;
  --accent-soft:#1b2135; --code-bg:#1c212e;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.35);
}
:root[data-theme="light"]{
  --bg:#f7f8fb; --surface:#ffffff; --surface-2:#eef1f7; --border:#dde2ec;
  --text:#1d2333; --muted:#5b6478; --accent:#4c6ef5; --accent-2:#3b5bdb;
  --accent-soft:#e8edff; --code-bg:#eef1f7;
  --shadow:0 1px 2px rgba(20,30,60,.06),0 8px 24px rgba(20,30,60,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;}
a{color:var(--accent-2);text-decoration:none}
a:hover{text-decoration:underline}
code,kbd,pre,.mono{font-family:"SFMono-Regular",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace}

/* layout */
.layout{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar);flex:0 0 var(--sidebar);border-right:1px solid var(--border);
  background:var(--surface);position:sticky;top:0;height:100vh;overflow-y:auto;padding:22px 0}
.brand{display:flex;align-items:center;gap:11px;padding:0 22px 18px;margin-bottom:8px;border-bottom:1px solid var(--border)}
.brand .logo{display:grid;grid-template-columns:11px 11px;grid-gap:3px;flex:0 0 auto}
.brand .logo i{width:11px;height:11px;border-radius:2px;display:block}
.brand .logo i:nth-child(1){background:#e8503a}.brand .logo i:nth-child(2){background:#37b24d}
.brand .logo i:nth-child(3){background:#4c6ef5}.brand .logo i:nth-child(4){background:#f4b400}
.brand b{font-size:18px;letter-spacing:.2px}
.brand .sub{display:block;font-size:12px;color:var(--muted);font-weight:400}
.nav{list-style:none;margin:14px 0 0;padding:0}
.nav a{display:block;padding:8px 22px;color:var(--text);font-size:14.5px;border-left:3px solid transparent}
.nav a:hover{background:var(--surface-2);text-decoration:none}
.nav a.active{border-left-color:var(--accent);color:var(--accent-2);background:var(--accent-soft);font-weight:600}
.nav .sec{padding:15px 22px 5px;font-size:11px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);font-weight:700;margin-top:6px;border-top:1px solid var(--border)}
.side-foot{padding:16px 22px 4px;margin-top:14px;border-top:1px solid var(--border);font-size:12.5px;color:var(--muted)}
.side-foot a{color:var(--muted)}

/* content */
.main{flex:1 1 auto;min-width:0}
.wrap{max-width:var(--maxw);margin:0 auto;padding:38px 30px 90px}
h1{font-size:32px;line-height:1.2;margin:.1em 0 .35em;letter-spacing:-.3px}
h2{font-size:23px;margin:2.1em 0 .5em;padding-top:.4em;letter-spacing:-.2px}
h3{font-size:18px;margin:1.6em 0 .3em}
h2:target,h3:target{scroll-margin-top:20px}
p{margin:.7em 0}
.lede{font-size:18.5px;color:var(--muted);margin:.2em 0 1.2em}
ul,ol{padding-left:1.3em}li{margin:.3em 0}
hr{border:0;border-top:1px solid var(--border);margin:2.4em 0}
.muted{color:var(--muted)}
strong{font-weight:650}

/* topbar (mobile) */
.topbar{display:none;align-items:center;gap:12px;position:sticky;top:0;z-index:20;
  background:var(--surface);border-bottom:1px solid var(--border);padding:10px 16px}
.topbar b{font-size:16px}
.menu-btn{appearance:none;border:1px solid var(--border);background:var(--surface-2);color:var(--text);
  border-radius:8px;padding:6px 10px;font-size:15px;cursor:pointer}

/* figure */
figure{margin:1.5em 0;background:var(--surface);border:1px solid var(--border);border-radius:12px;
  overflow:hidden;box-shadow:var(--shadow)}
figure img{display:block;width:100%;height:auto;background:#0b0d13}
figure.film video{display:block;width:100%;height:auto;background:#0b0d13}
figure.film .fallback{padding:15px;margin:0;color:var(--muted)}
figcaption{padding:10px 15px;font-size:13.5px;color:var(--muted);border-top:1px solid var(--border);background:var(--surface)}

/* click-to-enlarge: the figure's image is a button, so it is keyboard
   reachable and announces itself; the cursor and a soft hover lift are the
   only affordance needed. */
button.zoom{display:block;width:100%;padding:0;border:0;background:none;cursor:zoom-in}
button.zoom:focus-visible{outline:3px solid var(--accent);outline-offset:-3px}
button.zoom img{transition:filter .12s ease}
button.zoom:hover img{filter:brightness(1.06)}
#lb{position:fixed;inset:0;z-index:99;display:none;place-items:center;
  background:rgba(8,10,16,.86);padding:24px;cursor:zoom-out}
#lb.on{display:grid}
#lb img{max-width:100%;max-height:calc(100vh - 96px);width:auto;height:auto;
  border-radius:10px;box-shadow:0 18px 60px rgba(0,0,0,.6);background:#0b0d13}
#lb figcaption{position:fixed;left:0;right:0;bottom:0;text-align:center;
  background:rgba(8,10,16,.92);color:#cfd6e6;border-top:0;padding:12px 20px}
#lb .x{position:fixed;top:14px;right:18px;font-size:26px;line-height:1;
  color:#cfd6e6;background:none;border:0;cursor:pointer;padding:6px 10px}
@media print{button.zoom{cursor:default}#lb{display:none!important}}
.shot-sm{max-width:520px}
.grid{display:grid;gap:18px}
.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid figure{margin:0;align-self:start}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin:1.2em 0}
.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:15px 16px;box-shadow:var(--shadow)}
.card h4{margin:.1em 0 .3em;font-size:15.5px}
.card p{margin:.2em 0;font-size:13.6px;color:var(--muted)}

/* callouts */
.note{border:1px solid var(--border);border-left:4px solid var(--accent);background:var(--surface);
  border-radius:10px;padding:12px 16px;margin:1.4em 0;font-size:14.6px}
.note.tip{border-left-color:#37b24d}.note.warn{border-left-color:#f08c00}
.note>b:first-child{display:block;margin-bottom:2px}

/* kbd + code */
kbd{display:inline-block;background:var(--surface-2);border:1px solid var(--border);border-bottom-width:2px;
  border-radius:6px;padding:1px 7px;font-size:12.8px;line-height:1.5;color:var(--text);white-space:nowrap}
code{background:var(--code-bg);border-radius:5px;padding:.1em .4em;font-size:13.4px}
pre{background:var(--code-bg);border:1px solid var(--border);border-radius:10px;padding:14px 16px;overflow-x:auto;font-size:13.4px;line-height:1.55}
pre code{background:none;padding:0}

/* tables */
.tw{overflow-x:auto;margin:1.3em 0}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--border);vertical-align:top}
th{font-size:12.5px;text-transform:uppercase;letter-spacing:.4px;color:var(--muted);font-weight:650}
tbody tr:hover{background:var(--surface-2)}
td code{white-space:nowrap}

/* hero */
.hero{background:linear-gradient(150deg,var(--accent-soft),transparent 70%);border:1px solid var(--border);
  border-radius:16px;padding:30px 30px 26px;margin:0 0 20px}
.hero h1{margin-top:0}
.hero .lede{margin-bottom:16px}
.pill{display:inline-block;background:var(--surface);border:1px solid var(--border);border-radius:999px;
  padding:3px 12px;font-size:12.5px;color:var(--muted);margin:0 6px 6px 0}
.btnrow{margin-top:14px;display:flex;flex-wrap:wrap;gap:10px}
.btn{display:inline-block;background:var(--accent);color:#fff;border-radius:9px;padding:9px 16px;font-size:14.5px;font-weight:600}
.btn:hover{background:var(--accent-2);text-decoration:none}
.btn.ghost{background:transparent;color:var(--accent-2);border:1px solid var(--border)}
.pagenav{display:flex;justify-content:space-between;gap:14px;margin-top:44px;border-top:1px solid var(--border);padding-top:18px;font-size:14.5px}
.pagenav .nxt{margin-left:auto;text-align:right}
.kv{font-size:13.6px;color:var(--muted)}

@media (max-width:860px){
  .sidebar{position:fixed;left:0;top:0;z-index:30;transform:translateX(-100%);transition:transform .2s ease;box-shadow:var(--shadow)}
  #mnav:checked ~ .layout .sidebar{transform:none}
  .topbar{display:flex}
  .grid.cols-2,.grid.cols-3{grid-template-columns:1fr}
  .wrap{padding:24px 18px 70px}
  h1{font-size:27px}
}
#mnav{display:none}