/* LayoffReady - single stylesheet. Theme tokens first; everything else uses them. */
:root{
  --bg:#f6f6fa;--bg2:#eef0f7;--surface:#ffffff;--surface2:#f4f5fa;--surface3:#eceef6;
  --text:#11131c;--text2:#3c4054;--muted:#6b6f85;--border:#e3e5ef;--border2:#d5d8e6;
  --brand:#6366f1;--brand2:#d946ef;--track:#6366f1;
  --easy:#059669;--medium:#d97706;--hard:#e11d48;
  --ring:color-mix(in srgb,var(--track) 35%,transparent);
  --shadow-sm:0 1px 2px rgba(17,19,28,.05);
  --shadow:0 1px 2px rgba(17,19,28,.04),0 6px 24px -6px rgba(17,19,28,.08);
  --shadow-lg:0 24px 64px -16px rgba(17,19,28,.25);
  --r:16px;--r-sm:10px;--bar:64px;--top:var(--bar);--side:296px;
  --font:"Assistant","Segoe UI",system-ui,-apple-system,sans-serif;
  --display:"Lora",Georgia,"Times New Roman",serif;
  --mono:"JetBrains Mono","Cascadia Code","Cascadia Mono",Consolas,ui-monospace,monospace;
}
[data-theme=dark]{
  --bg:#0a0b10;--bg2:#0f1018;--surface:#13141c;--surface2:#191a24;--surface3:#20222e;
  --text:#eceef6;--text2:#c3c6d6;--muted:#9195aa;--border:#24263330;--border:#252735;--border2:#30324300;--border2:#323446;
  --brand:#818cf8;--brand2:#e879f9;
  --easy:#34d399;--medium:#fbbf24;--hard:#fb7185;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);--shadow:0 1px 2px rgba(0,0,0,.35),0 10px 30px -10px rgba(0,0,0,.5);
  --shadow-lg:0 30px 80px -20px rgba(0,0,0,.7);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--top) + 20px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 var(--font);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:color-mix(in srgb,var(--track) 85%,var(--text));text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
:where(svg:not(.diagram svg)){width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;flex:none}
.diagram svg{max-width:100%;height:auto}
code,pre,kbd{font-family:var(--mono);font-variant-ligatures:none}
code{font-size:.85em;background:var(--surface2);border:1px solid var(--border);padding:.08em .42em;border-radius:6px;color:var(--text2)}
kbd{font-size:11px;border:1px solid var(--border2);border-bottom-width:2px;border-radius:6px;padding:1px 6px;background:var(--surface);color:var(--muted)}
h1,h2,h3,h4{font-family:var(--display);line-height:1.2;letter-spacing:-.022em;margin:0}
button{font:inherit;color:inherit}
:focus-visible{outline:2.5px solid var(--track);outline-offset:2px;border-radius:8px}
::selection{background:color-mix(in srgb,var(--track) 30%,transparent)}
.skip{position:absolute;left:-999px;top:8px;z-index:100;background:var(--surface);padding:8px 14px;border-radius:8px;box-shadow:var(--shadow)}
.skip:focus{left:12px}
.read-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:60;pointer-events:none}
.read-progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--track),var(--brand2))}

/* ---------- top bar ---------- */
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:saturate(1.8) blur(16px);-webkit-backdrop-filter:saturate(1.8) blur(16px);border-bottom:1px solid var(--border)}
.topbar{position:relative;height:var(--bar);display:flex;align-items:center;gap:12px;padding:0 18px}
.mainnav{flex:1;min-width:0;display:flex;align-items:center;gap:2px;margin-left:10px;position:relative}
.mn-links{display:flex;align-items:center;gap:2px;min-width:0;flex:0 1 auto}
.mn-more{position:relative;flex:none}
.mn-more-btn{border:0;background:none;cursor:pointer;font:inherit;font-weight:600}
.mn-more-btn .chev{width:14px;height:14px;color:var(--muted)}
.mn-menu{position:absolute;top:44px;left:0;min-width:220px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);padding:6px;z-index:60}
.mn-menu .mn-link{display:flex;width:100%;height:38px}
.mn-menu .mn-link.active::after{display:none}
.mn-link{position:relative;display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 12px;border-radius:9px;color:var(--text2);font-weight:600;font-size:14px;white-space:nowrap}
.mn-link:hover{background:var(--surface2);color:var(--text);text-decoration:none}
.mn-link.active{color:var(--text);background:color-mix(in srgb,var(--brand) 12%,transparent)}
.mn-link.active::after{content:"";position:absolute;left:12px;right:12px;bottom:-14px;height:2.5px;border-radius:3px;background:linear-gradient(90deg,var(--brand),var(--brand2))}
.mn-badge{font:800 9.5px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:#fff;background:linear-gradient(135deg,#f97316,#ec4899);border-radius:999px;padding:1px 6px}
.track-switch{display:none}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font:700 16.5px var(--display);letter-spacing:-.02em;white-space:nowrap}
.brand:hover{text-decoration:none}
.logo{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand2));position:relative;box-shadow:0 6px 16px -6px var(--brand)}
.logo::after{content:"";position:absolute;inset:9px 8px 8px;border:3px solid #fff;border-width:3px 3px 0 0;transform:rotate(-45deg) translate(-1px,3px);border-radius:2px}
.track-switch{position:relative}
.ts-btn{display:flex;align-items:center;gap:8px;height:38px;padding:0 10px 0 6px;border:1px solid var(--border);border-radius:11px;background:var(--surface);cursor:pointer;font-weight:600;font-size:13.5px;max-width:240px}
.ts-btn:hover{border-color:var(--border2)}
.ts-btn #tsLabel{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ts-btn .chev{width:15px;height:15px;color:var(--muted)}
.ts-badge,.tbadge,.th-badge,.pal-badge{display:inline-grid;place-items:center;font:800 11px var(--mono);color:#fff;background:var(--track);border-radius:8px;min-width:26px;height:26px;padding:0 5px}
.ts-menu{position:absolute;top:46px;left:0;min-width:280px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);padding:6px;z-index:50}
.ts-menu .grp{font-size:11px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:700;padding:8px 10px 4px}
.ts-menu a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:9px;color:var(--text);font-size:14px}
.ts-menu a:hover,.ts-menu a[aria-selected=true]{background:var(--surface2);text-decoration:none}
.ts-menu a small{margin-left:auto;color:var(--muted);font-size:12px}
.search-btn{flex:none;margin-left:auto;display:flex;align-items:center;gap:10px;height:38px;padding:0 8px 0 12px;border:1px solid var(--border);border-radius:11px;background:var(--surface);color:var(--muted);cursor:pointer;font-size:14px;text-align:left}
.search-btn:hover{border-color:var(--border2);color:var(--text2)}
.search-btn span{flex:1;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.top-actions{display:flex;gap:6px;position:relative}
.icon-btn{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--border);border-radius:11px;background:var(--surface);cursor:pointer;color:var(--text2)}
.icon-btn:hover{border-color:var(--border2);color:var(--text)}
[data-theme=dark] .i-sun,[data-theme=light] .i-moon{display:none}
.focus-mode #focusBtn{background:var(--track);color:#fff;border-color:transparent}
.menu{position:absolute;right:0;top:46px;min-width:230px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);padding:6px;z-index:50}
.menu a,.menu button{display:block;width:100%;text-align:left;padding:8px 12px;border:0;background:none;border-radius:9px;font-size:14px;color:var(--text);cursor:pointer}
.menu a:hover,.menu button:hover{background:var(--surface2);text-decoration:none}
.menu .danger{color:var(--hard)}
.only-mobile{display:none}

/* ---------- shell ---------- */
.shell{display:flex;min-height:calc(100vh - var(--top))}
.sidebar{display:none}
.has-sidebar .sidebar{display:block;position:sticky;top:var(--top);height:calc(100vh - var(--top));width:var(--side);flex:none;overflow:auto;
  border-right:1px solid var(--border);background:var(--surface);padding:14px 10px 60px;scrollbar-width:thin}
.focus-mode .has-sidebar .sidebar{display:none}
.main{flex:1;min-width:0;padding:34px clamp(18px,4vw,60px) 96px;outline:none}
.home .main{padding-top:0;overflow-x:clip}
.scrim{display:none}
.sb-head{display:flex;align-items:center;gap:10px;padding:6px 8px 12px;border-bottom:1px solid var(--border);margin-bottom:10px}
.sb-head a{color:var(--text);font-weight:700;font-size:14.5px;line-height:1.3}
.sb-head small{display:block;color:var(--muted);font-weight:500;font-size:12px}
.sb-prog{height:4px;border-radius:9px;background:var(--surface3);margin:0 8px 12px;overflow:hidden}
.sb-prog i{display:block;height:100%;background:var(--track);width:0;transition:width .3s}
.sb-sec summary{list-style:none;display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:9px;cursor:pointer;font-size:13.5px;font-weight:600;color:var(--text2);user-select:none}
.sb-sec summary::-webkit-details-marker{display:none}
.sb-sec summary:hover{background:var(--surface2);color:var(--text)}
.sb-sec summary .k{font:600 10.5px var(--mono);color:var(--muted);width:18px}
.sb-sec summary .nm{flex:1;line-height:1.3}
.sb-sec summary .ct{font-size:11px;color:var(--muted)}
.sb-sec summary::after{content:"";width:6px;height:6px;border:solid var(--muted);border-width:0 1.6px 1.6px 0;transform:rotate(-45deg);transition:transform .15s;margin-right:4px}
.sb-sec[open] summary::after{transform:rotate(45deg)}
.sb-sec ul{list-style:none;margin:2px 0 8px 17px;padding:0 0 0 10px;border-left:1px solid var(--border)}
.sb-sec li a{display:flex;align-items:center;gap:8px;padding:4.5px 8px;border-radius:8px;font-size:13.3px;color:var(--muted);line-height:1.35}
.sb-sec li a:hover{color:var(--text);background:var(--surface2);text-decoration:none}
.sb-sec li a[aria-current=page]{color:var(--text);background:color-mix(in srgb,var(--track) 12%,transparent);font-weight:600}
.sb-sec li a .t{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sb-sec li a.na{opacity:.55}
.dot{width:7px;height:7px;border-radius:50%;flex:none;background:var(--border2)}
.dot.Easy{background:var(--easy)}.dot.Medium{background:var(--medium)}.dot.Hard{background:var(--hard)}
.ok{display:none;color:var(--easy);font-weight:800;font-size:12px}.is-solved .ok{display:inline}

/* ---------- shared bits ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;height:44px;padding:0 20px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-weight:600;font-size:14.5px;cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .12s,border-color .12s}
.btn:hover{text-decoration:none;border-color:var(--border2);transform:translateY(-1px)}
.btn.primary{background:linear-gradient(135deg,var(--track),color-mix(in srgb,var(--track) 55%,var(--brand2)));color:#fff;border:0;box-shadow:0 10px 24px -10px var(--track)}
.btn kbd{margin-left:4px}
.kicker,.eyebrow{font:700 12px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
.kicker{color:var(--track)}
.lead{font-size:18px;color:var(--muted);max-width:700px;margin:0}
.grad{background:linear-gradient(120deg,var(--brand),var(--brand2) 70%,#f97316);-webkit-background-clip:text;background-clip:text;color:transparent}
.diff{display:inline-block;font-size:11.5px;font-weight:700;padding:1px 9px;border-radius:999px;white-space:nowrap}
.diff.Easy{color:var(--easy);background:color-mix(in srgb,var(--easy) 13%,transparent)}
.diff.Medium{color:var(--medium);background:color-mix(in srgb,var(--medium) 15%,transparent)}
.diff.Hard{color:var(--hard);background:color-mix(in srgb,var(--hard) 13%,transparent)}
.chips{display:flex;gap:2px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:3px}
.chip{border:0;background:none;color:var(--muted);font-weight:600;font-size:13px;padding:6px 12px;border-radius:9px;cursor:pointer;white-space:nowrap}
.chip:hover{color:var(--text)}
.chip.on{background:color-mix(in srgb,var(--track) 14%,transparent);color:color-mix(in srgb,var(--track) 80%,var(--text))}
.chip.ghost{border:1px solid var(--border);background:var(--surface)}
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);opacity:0;background:var(--text);color:var(--bg);padding:10px 18px;border-radius:12px;font-size:14px;font-weight:600;transition:.25s;z-index:90;pointer-events:none;box-shadow:var(--shadow-lg)}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- home ---------- */
.hero{position:relative;padding:72px 0 40px;max-width:1100px}
.hero-bg{position:absolute;inset:-40px -30vw 0 -30vw;z-index:-1;pointer-events:none;
  background:radial-gradient(600px 300px at 18% 30%,color-mix(in srgb,var(--brand) 22%,transparent),transparent 70%),
             radial-gradient(500px 280px at 70% 10%,color-mix(in srgb,var(--brand2) 18%,transparent),transparent 70%),
             radial-gradient(500px 260px at 55% 80%,color-mix(in srgb,#f97316 12%,transparent),transparent 70%);
  -webkit-mask-image:linear-gradient(#000 60%,transparent);mask-image:linear-gradient(#000 60%,transparent)}
.hero .kicker{color:var(--brand)}
.hero h1{font-size:clamp(38px,6vw,68px);font-weight:800;letter-spacing:-.04em;margin:0 0 18px;max-width:900px}
.hero .lead{margin-bottom:30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:34px}
.hero-stats{display:flex;flex-wrap:wrap;gap:28px}
.hero-stats b{display:block;font:800 26px var(--display);letter-spacing:-.03em}
.hero-stats span{font-size:12.5px;color:var(--muted)}
.resume{display:flex;align-items:center;gap:18px;flex-wrap:wrap;background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:16px 20px;box-shadow:var(--shadow);margin-bottom:12px;max-width:1100px}
.resume .rk{font-size:12px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.08em}
.resume .rt{font:700 17px var(--display)}
.resume .btn{margin-left:auto}
.cat{margin-top:46px;max-width:1240px}
.tgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:16px}
.tcard{position:relative;display:flex;flex-direction:column;gap:6px;padding:22px;border-radius:20px;background:var(--surface);border:1px solid var(--border);color:var(--text);box-shadow:var(--shadow);overflow:hidden;transition:transform .18s,border-color .18s,box-shadow .18s}
.tcard::before{content:"";position:absolute;inset:0 0 auto;height:120px;background:radial-gradient(260px 120px at 85% -10%,color-mix(in srgb,var(--track) 28%,transparent),transparent 70%);pointer-events:none}
.tcard:hover{text-decoration:none;transform:translateY(-3px);border-color:color-mix(in srgb,var(--track) 45%,var(--border));box-shadow:0 18px 40px -18px color-mix(in srgb,var(--track) 60%,transparent)}
.tcard .tbadge{height:40px;min-width:46px;font-size:14px;border-radius:12px;box-shadow:0 8px 20px -8px var(--track);align-self:flex-start;margin-bottom:8px}
.tcard .tsub{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700}
.tcard h3{font-size:21px}
.tcard p{margin:0;color:var(--muted);font-size:14px;flex:1}
.tcard .tmeta{font-size:12.5px;color:var(--text2);margin-top:8px;display:flex;gap:8px;flex-wrap:wrap}
.tcard .cov{color:var(--muted)}
.tcard .tprog{height:6px;border-radius:9px;background:var(--surface3);overflow:hidden;margin-top:6px}
.tcard .tprog i{display:block;height:100%;width:0;background:var(--track);transition:width .4s}
.tcard .tpct{font-size:12px;color:var(--muted)}
.rev-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:10px}
.rev-list a{display:flex;align-items:center;gap:10px;padding:12px 14px;border:1px solid var(--border);background:var(--surface);border-radius:12px;color:var(--text);font-weight:600;font-size:14px}
.rev-list a:hover{border-color:var(--border2);text-decoration:none}
.rev-list a .diff{margin-left:auto}
.rev-empty{color:var(--muted);font-size:14px;margin:0}

/* ---------- track page ---------- */
.track-hero{position:relative;display:flex;gap:28px;align-items:center;padding:30px;border-radius:24px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden;max-width:1100px}
.track-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 220px at 100% 0,color-mix(in srgb,var(--track) 20%,transparent),transparent 70%);pointer-events:none}
.th-badge{height:72px;min-width:76px;font-size:22px;border-radius:20px;box-shadow:0 14px 30px -12px var(--track);align-self:flex-start}
.th-text{flex:1;position:relative}
.th-text h1{font-size:clamp(28px,4vw,40px);font-weight:800;margin-bottom:8px}
.th-text .lead{font-size:16px;margin-bottom:18px}
.th-stats{display:flex;flex-wrap:wrap;gap:22px;margin-bottom:20px}
.th-stats b{display:block;font:800 22px var(--display)}.th-stats span{font-size:12px;color:var(--muted)}
.th-stats .Easy b{color:var(--easy)}.th-stats .Medium b{color:var(--medium)}.th-stats .Hard b{color:var(--hard)}
.th-actions{display:flex;gap:10px;flex-wrap:wrap}
.ring{position:relative;width:132px;height:132px;flex:none}
.ring svg{width:132px;height:132px;transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:10}.ring .bg{stroke:var(--surface3)}
.ring .fg{stroke:var(--track);stroke-linecap:round;stroke-dasharray:326.7;stroke-dashoffset:326.7;transition:stroke-dashoffset .6s}
.ring div{position:absolute;inset:0;display:grid;place-content:center;text-align:center}
.ring b{font:800 24px var(--display)}.ring span{font-size:12px;color:var(--muted)}
.toolbar{position:sticky;top:var(--top);z-index:20;display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:14px 0;margin:18px 0 6px;max-width:1100px;
  background:linear-gradient(var(--bg) 75%,transparent)}
.filter-search{display:flex;align-items:center;gap:8px;flex:1;min-width:200px;height:40px;padding:0 12px;border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--muted)}
.filter-search:focus-within{border-color:var(--track);box-shadow:0 0 0 4px var(--ring)}
.filter-search input{flex:1;border:0;outline:0;background:none;color:var(--text);font-size:14px;height:100%}
.sections{display:grid;gap:12px;max-width:1100px}
.sec-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);box-shadow:var(--shadow-sm);overflow:hidden}
.sec-card summary{list-style:none;display:flex;align-items:center;gap:12px;padding:14px 18px;cursor:pointer;line-height:1.3}
.sec-card summary>*{align-self:center}
.sec-card summary::-webkit-details-marker{display:none}
.sec-card summary:hover{background:var(--surface2)}
.sec-card .sn{font:700 12px var(--mono);color:var(--track);background:color-mix(in srgb,var(--track) 12%,transparent);padding:3px 8px;border-radius:8px}
.sec-card h2{font-size:16.5px;flex:1}
.sec-card .sp{font-size:12px;color:var(--muted)}
.sec-card .sc{font-size:12px;color:var(--muted);background:var(--surface2);border-radius:999px;padding:1px 9px}
.sec-card summary::after{content:"";width:7px;height:7px;border:solid var(--muted);border-width:0 2px 2px 0;transform:rotate(45deg);transition:transform .15s;margin:0 4px}
.sec-card:not([open]) summary::after{transform:rotate(-45deg)}
.sec-card ol{list-style:none;margin:0;padding:4px 10px 10px}
.sec-card li{display:flex;align-items:center;border-radius:10px}
.sec-card li:hover{background:var(--surface2)}
.sec-card li[hidden]{display:none}
.sec-card li>a{flex:1;display:flex;align-items:center;gap:12px;padding:9px 10px;color:var(--text);font-size:14.5px;min-width:0}
.sec-card li>a:hover{text-decoration:none}
.sec-card .no{font:12px var(--mono);color:var(--muted);width:28px;text-align:right;flex:none}
.sec-card .t{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sec-card li[data-has="0"] .t{color:var(--muted)}
.st{width:18px;height:18px;border-radius:50%;border:1.6px solid var(--border2);flex:none;display:grid;place-items:center}
.is-solved .st{background:var(--easy);border-color:var(--easy)}
.is-solved .st::after{content:"";width:5px;height:9px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg) translate(-1px,-1px)}
.soon{font-size:11px;font-weight:700;color:var(--muted);border:1px dashed var(--border2);border-radius:999px;padding:0 8px}
.star{border:0;background:none;color:var(--border2);padding:8px;cursor:pointer;border-radius:8px}
.star:hover{color:var(--muted)}
.star.on{color:#f59e0b}.star.on svg{fill:#f59e0b}
.empty-state{text-align:center;color:var(--muted);padding:40px}
.sec-card.no-match{display:none}

/* ---------- item pages ---------- */
.doc{max-width:900px;min-width:0}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:14px;min-height:20px}
.crumbs a{color:var(--muted)}.crumbs a:hover{color:var(--text)}
.crumbs .sep{opacity:.5}
.crumbs .pill{display:inline-grid;place-items:center;font:800 10px var(--mono);color:#fff;background:var(--track);border-radius:6px;padding:2px 6px}
.doc-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:24px}
.doc-head h1{font-size:clamp(28px,4vw,40px);font-weight:800;margin-bottom:12px}
.meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.tag{font-size:12.5px;color:var(--text2);border:1px solid var(--border);border-radius:999px;padding:1px 10px;background:var(--surface)}
.tag.subtle{color:var(--muted)}
.ext{font-size:13px;font-weight:600}
.doc-actions{display:flex;gap:8px;flex:none}
.act{display:flex;align-items:center;gap:7px;height:40px;padding:0 14px;border:1px solid var(--border);border-radius:12px;background:var(--surface);cursor:pointer;font-weight:600;font-size:13.5px;color:var(--text2)}
.act:hover{border-color:var(--border2);color:var(--text)}
.act[aria-pressed=true]{color:#d97706;border-color:color-mix(in srgb,#f59e0b 50%,var(--border))}
.act[aria-pressed=true] svg{fill:#f59e0b;stroke:#f59e0b}
.act.solve[aria-pressed=true]{color:#fff;background:var(--easy);border-color:var(--easy)}
.act.solve[aria-pressed=true] svg{stroke:#fff}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:22px 24px;box-shadow:var(--shadow)}
.eyebrow.sec{margin:38px 0 14px}
.prose{color:var(--text2)}
.prose>*:first-child{margin-top:0}
.examples{display:grid;gap:8px;margin:16px 0}
.ex{display:grid;grid-template-columns:auto 1fr auto 1fr;gap:6px 14px;align-items:center;background:var(--surface2);border-radius:12px;padding:10px 16px}
.ex .k{font:700 10.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.ex code{background:none;border:0;padding:0;font-size:13.5px;color:var(--text);word-break:break-word}
.constraints{font-size:13.5px;color:var(--muted);margin:0}
.callout{position:relative;border-radius:14px;padding:14px 18px 14px 20px;margin:18px 0;background:var(--surface);border:1px solid var(--border);overflow:hidden;color:var(--text2)}
.callout::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--c,var(--track))}
.callout::after{content:"";position:absolute;inset:0;background:var(--c,var(--track));opacity:.045;pointer-events:none}
.callout>b{display:block;font:700 11.5px var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--c);margin-bottom:4px}
.callout p{margin:.3em 0}.callout ul{margin:6px 0 0;padding-left:18px}.callout li{margin:4px 0}
.callout.insight{--c:#ca8a04}.callout.tip{--c:#a855f7}.callout.warn{--c:var(--hard)}.callout.good{--c:var(--easy)}.callout.note{--c:#0ea5e9}.callout.pattern{--c:var(--track)}
.related{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.related span{font-size:12.5px;background:color-mix(in srgb,var(--track) 12%,transparent);color:color-mix(in srgb,var(--track) 80%,var(--text));border-radius:999px;padding:2px 10px}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.tab{flex:1 1 150px;display:flex;align-items:center;gap:10px;border:1px solid var(--border);background:var(--surface);color:var(--muted);font-weight:600;font-size:14px;padding:10px 14px;border-radius:13px;cursor:pointer;text-align:left;transition:.15s}
.tab .n{display:grid;place-items:center;width:24px;height:24px;border-radius:8px;background:var(--surface2);font-size:12px;flex:none}
.tab small{margin-left:auto;font:12px var(--mono);opacity:.8}
.tab:hover{color:var(--text);border-color:var(--border2)}
.tab.all{flex:0 0 auto}
.tab[aria-selected=true],.tab.all[aria-pressed=true]{color:var(--text);box-shadow:var(--shadow);border-color:var(--lc,var(--track))}
.tab[aria-selected=true] .n,.tab.all[aria-pressed=true] .n{background:var(--lc,var(--track));color:#fff}
.tab.brute{--lc:var(--hard)}.tab.better{--lc:var(--medium)}.tab.optimal{--lc:var(--easy)}
.panels.all .panel{display:block!important;margin-bottom:14px}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:22px 24px;box-shadow:var(--shadow);animation:rise .22s ease}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:8px}
.panel-head h3{font-size:19px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.lvl{font:800 10px var(--mono);text-transform:uppercase;letter-spacing:.08em;padding:3px 9px;border-radius:999px;color:#fff;white-space:nowrap}
.lvl.brute{background:var(--hard)}.lvl.better{background:var(--medium)}.lvl.optimal{background:var(--easy)}
.cx{display:flex;gap:8px;font-size:12.5px;color:var(--muted)}
.cx span{background:var(--surface2);border-radius:10px;padding:4px 10px}
.cx code{border:0;background:none;color:var(--text);font-weight:700;padding:0 0 0 4px}
.idea{margin:6px 0 16px;color:var(--text2)}
.code{border:1px solid var(--border);border-radius:14px;overflow:hidden;background:color-mix(in srgb,var(--surface2) 60%,var(--surface));margin:14px 0}
.code-bar{display:flex;justify-content:space-between;align-items:center;padding:7px 14px;border-bottom:1px solid var(--border);font:600 11.5px var(--mono);color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.copy{border:1px solid var(--border);background:var(--surface);color:var(--muted);font:600 12px var(--font);padding:3px 10px;border-radius:8px;cursor:pointer;text-transform:none;letter-spacing:0}
.copy:hover{color:var(--text)}.copy.done{color:var(--easy);border-color:var(--easy)}
.hl pre{margin:0;padding:16px 18px;overflow:auto;font-size:13.3px;line-height:1.65;tab-size:4}
.verdict{margin:16px 0 0;color:var(--muted);font-size:14.5px}
.verdict::before{content:"\2192\00a0";color:var(--track);font-weight:700}
.dry{margin-top:16px;border:1px dashed var(--border2);border-radius:14px;padding:12px 16px}
.dry summary{display:flex;align-items:center;gap:10px;cursor:pointer;font:700 11.5px var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--text)}
.dry summary code{text-transform:none;letter-spacing:0;font-weight:500}
.legend{display:flex;flex-wrap:wrap;gap:14px;font-size:12.5px;color:var(--muted);margin:10px 0}
.legend b{font-family:var(--mono);color:var(--track)}
.sw{display:inline-block;width:10px;height:10px;border-radius:3px;background:#fde68a;border:1px solid #f59e0b;vertical-align:-1px}
.steps{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.step{background:var(--surface2);border-radius:12px;padding:8px 10px}
.step .lbl{font:700 11.5px var(--mono);margin-bottom:4px}.step .note{font-size:12px;color:var(--muted);margin-top:2px;max-width:260px}
.arr{display:flex;gap:3px}.cell{text-align:center;min-width:26px}
.box{height:26px;line-height:23px;padding:0 4px;border:1.5px solid var(--border2);border-radius:7px;background:var(--surface);font:700 12.5px var(--mono)}
.box.zero,.box.empty{color:var(--muted)}.box.empty{border-style:dashed}
.box.hl{background:#fde68a;border-color:#f59e0b;color:#78350f}
.ptr{font:700 11px var(--mono);color:var(--track);height:15px}
.table-wrap{overflow:auto;border:1px solid var(--border);border-radius:14px;background:var(--surface);margin:16px 0}
table{width:100%;border-collapse:collapse;font-size:14px}
th{text-align:left;font:700 11px var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);background:var(--surface2);padding:10px 14px}
td{padding:10px 14px;border-top:1px solid var(--border);vertical-align:top}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid-2 .callout{margin:16px 0 0}
.notes{margin-top:26px;border:1px solid var(--border);border-radius:var(--r);background:var(--surface);padding:12px 18px}
.notes summary{cursor:pointer;font-weight:700;font-size:14.5px}
.notes summary small{color:var(--muted);font-weight:500;margin-left:6px}
.notes textarea{width:100%;margin-top:12px;border:1px solid var(--border);border-radius:12px;background:var(--surface2);color:var(--text);padding:12px;font:14px/1.6 var(--font);resize:vertical}
.notes textarea:focus{outline:0;border-color:var(--track);box-shadow:0 0 0 4px var(--ring)}
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:36px}
.pn{display:flex;flex-direction:column;gap:2px;border:1px solid var(--border);background:var(--surface);border-radius:14px;padding:14px 18px;color:var(--text);font-weight:600;transition:.15s}
.pn small{color:var(--muted);font-weight:500;font-size:12px}
.pn.next{text-align:right;grid-column:2}
.pn:hover{text-decoration:none;border-color:var(--track);transform:translateY(-1px)}
/* article */
.article-wrap{display:flex;gap:48px;align-items:flex-start}
.article .lede{font-size:18px;color:var(--muted);margin:-8px 0 26px}
.article .prose{font-size:16px}
.prose h2{font-size:24px;margin:44px 0 12px;padding-top:6px}
.prose h3{font-size:18.5px;margin:28px 0 8px}
.prose p,.prose ul,.prose ol{margin:10px 0}
.prose li{margin:5px 0}.prose li::marker{color:var(--muted)}
.prose strong{color:var(--text)}
.prose .code{margin:18px 0}
.diagram{border:1px solid var(--border);border-radius:16px;background:var(--surface);padding:18px;margin:18px 0;overflow:auto;text-align:center}
.diagram pre.mermaid{margin:0;font:13px var(--mono);color:var(--muted);text-align:left;white-space:pre}
.diagram pre.mermaid[data-processed]{text-align:center;white-space:normal}
.toc{position:sticky;top:calc(var(--top) + 28px);flex:none;font-size:13.5px}
.toc-inner{max-height:max(240px,calc(100vh - var(--top) - 380px));overflow:auto;scrollbar-width:thin;scrollbar-color:var(--border2) transparent}
.toc-inner::-webkit-scrollbar{width:6px}.toc-inner::-webkit-scrollbar-thumb{background:var(--border2);border-radius:6px}.toc-inner::-webkit-scrollbar-track{background:transparent}
.toc p{font:700 11px var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:0 0 10px}
.toc ul{list-style:none;margin:0;padding:0;border-left:1px solid var(--border)}
.toc ul ul{border:0;padding-left:12px}
.toc a{display:block;padding:4px 0 4px 14px;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);line-height:1.4}
.toc a:hover{color:var(--text);text-decoration:none}
.toc a.active{color:var(--track);border-left-color:var(--track);font-weight:600}
.focus-mode .toc{display:none}

/* ---------- palette & modal ---------- */
.palette,.modal{position:fixed;inset:0;z-index:80;background:rgba(10,11,16,.45);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);display:flex;justify-content:center;align-items:flex-start;padding:10vh 16px 16px}
.palette[hidden],.modal[hidden]{display:none}
.palette-box,.modal-box{width:100%;max-width:640px;background:var(--surface);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow-lg);overflow:hidden;animation:pop .16s ease}
@keyframes pop{from{opacity:0;transform:scale(.98) translateY(-6px)}to{opacity:1;transform:none}}
.palette-input{display:flex;align-items:center;gap:12px;padding:16px 18px;border-bottom:1px solid var(--border);color:var(--muted)}
.palette-input svg{width:20px;height:20px}
.palette-input input{flex:1;border:0;outline:0;background:none;color:var(--text);font-size:17px}
.palette-filters{display:flex;gap:6px;padding:10px 14px;border-bottom:1px solid var(--border);overflow-x:auto}
.palette-filters button{border:1px solid var(--border);background:var(--surface);border-radius:999px;padding:3px 11px;font-size:12.5px;font-weight:600;color:var(--muted);cursor:pointer;white-space:nowrap}
.palette-filters button.on{color:#fff;background:var(--c,var(--brand));border-color:transparent}
.palette-list{list-style:none;margin:0;padding:8px;max-height:52vh;overflow:auto}
.palette-list .grp{font:700 11px var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--muted);padding:10px 10px 4px}
.palette-list a{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:12px;color:var(--text)}
.palette-list a:hover{text-decoration:none}
.palette-list a.sel{background:color-mix(in srgb,var(--brand) 12%,transparent)}
.palette-list .pt{flex:1;min-width:0}
.palette-list .pt b{display:block;font-weight:600;font-size:14.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.palette-list .pt small{color:var(--muted);font-size:12.5px}
.palette-list mark{background:color-mix(in srgb,var(--brand) 25%,transparent);color:inherit;border-radius:3px}
.palette-list .pal-badge{min-width:30px;height:24px;font-size:10px}
.palette-list .none{padding:28px;text-align:center;color:var(--muted)}
.palette-foot{display:flex;gap:18px;padding:10px 18px;border-top:1px solid var(--border);font-size:12px;color:var(--muted)}
.modal-box{padding:24px 26px;max-width:480px}
.modal-box h2{font-size:20px;margin-bottom:14px}
.sc{display:grid;grid-template-columns:auto 1fr;gap:10px 18px;margin:0 0 20px;font-size:14px}
.sc dd{margin:0;color:var(--muted)}

/* ---------- responsive ---------- */
@media (max-width:1240px){.toc{display:none}}
@media (max-width:1000px){
  .only-mobile{display:grid}
  body:not(.has-sidebar) #navToggle{display:none}
  .has-sidebar .sidebar{position:fixed;left:0;top:var(--top);z-index:35;transform:translateX(-102%);transition:transform .22s;box-shadow:var(--shadow-lg);display:block}
  .focus-mode .has-sidebar .sidebar{display:block}
  .nav-open .sidebar{transform:none}
  .nav-open .scrim{display:block;position:fixed;inset:var(--top) 0 0 0;background:rgba(0,0,0,.35);z-index:30}
  .search-btn span,.search-btn kbd{display:none}.search-btn{flex:0 0 38px;padding:0;justify-content:center;margin-left:auto}
  .track-hero{flex-direction:column;align-items:flex-start}.ring{position:absolute;right:20px;top:20px;width:96px;height:96px}.ring svg{width:96px;height:96px}.ring b{font-size:18px}
  .grid-2{grid-template-columns:1fr}.doc-head{flex-direction:column}
}
@media (max-width:640px){
  body{font-size:15px}.main{padding:22px 16px 80px}
  .brand-name,#focusBtn{display:none}.ts-btn{max-width:150px}
  .ex{grid-template-columns:auto 1fr}.tab small{display:none}.tab{flex:1 1 40%}
  .th-badge{height:56px;min-width:60px;font-size:18px}.ring{display:none}
  .palette{padding-top:12px}.palette-foot{display:none}
  .prevnext{grid-template-columns:1fr}.pn.next{grid-column:1}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.topbar,.sidebar,.toc,.prevnext,.doc-actions,.tabs,.notes,.read-progress,.toolbar{display:none!important}.panel[hidden]{display:block!important}.main{padding:0}body{background:#fff}}
/* ---------- theme switch (top-right) ---------- */
.theme-switch{border:0;background:none;padding:0;cursor:pointer;flex:none;margin-left:4px;border-radius:999px}
.ts-track{position:relative;display:flex;align-items:center;justify-content:space-between;width:64px;height:38px;padding:0 9px;border-radius:999px;
  background:var(--surface);border:1px solid var(--border);transition:background .25s,border-color .25s}
.theme-switch:hover .ts-track{border-color:var(--border2)}
.ts-track svg{width:16px;height:16px;position:relative;z-index:1;transition:color .25s}
.ts-sun{color:#f59e0b}.ts-moon{color:var(--muted)}
[data-theme=dark] .ts-sun{color:var(--muted)}[data-theme=dark] .ts-moon{color:#c7d2fe}
.ts-knob{position:absolute;top:3px;left:3px;width:30px;height:30px;border-radius:50%;background:color-mix(in srgb,#f59e0b 16%,var(--surface2));
  box-shadow:var(--shadow-sm);transition:transform .25s cubic-bezier(.4,1.4,.6,1),background .25s}
[data-theme=dark] .ts-knob{transform:translateX(26px);background:color-mix(in srgb,var(--brand) 30%,var(--surface3))}

/* ---------- ad slots (Google AdSense) ---------- */
.ad{display:none;position:relative;margin:30px auto;text-align:center;min-height:130px;max-width:100%;clear:both}
[data-ads=on] .ad,.ads-preview .ad{display:block}
.ad-label{display:block;font:600 10px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);opacity:.8;margin-bottom:6px}
.ad ins.adsbygoogle{display:block;min-height:100px;background:transparent}
.ad:has(ins[data-ad-status=unfilled]){display:none!important}
.ad-rail{min-height:620px;margin:0}
.ad-rail ins.adsbygoogle{min-height:600px}
.ads-preview .ad::after{content:attr(data-preview);display:grid;place-items:center;min-height:100px;border:1.5px dashed var(--border2);border-radius:12px;
  color:var(--muted);font:600 12px var(--mono);background:repeating-linear-gradient(135deg,transparent 0 12px,color-mix(in srgb,var(--border) 45%,transparent) 12px 13px)}
.ads-preview .ad-rail::after{min-height:600px}
.with-rail{display:flex;gap:40px;align-items:flex-start}
.with-rail>.doc{flex:1}
.rail{display:none;width:300px;flex:none;position:sticky;top:calc(var(--top) + 28px)}
.focus-mode .rail{display:none!important}
@media (min-width:1320px){.rail{display:block}}
.toc{width:260px}
.toc .ad-rail{margin-top:28px;min-height:0}
.toc .ad-rail ins.adsbygoogle{min-height:250px}
.ads-preview .toc .ad-rail::after{min-height:250px}

/* ---------- footer & static pages ---------- */
.site-ack{margin-top:80px;padding:26px 0 8px;border-top:1px solid var(--border);max-width:1240px;font-size:13.5px;color:var(--muted)}
.site-ack h2{font-size:17px;margin:0 0 4px;color:var(--text)}
.ack-intro{margin:0 0 16px;max-width:820px}
.ack-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:8px 32px}
.ack-col h2,.prose .ack-col h2,.ack-col h3{font:700 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 8px}
.ack-col ul{list-style:none;margin:0 0 12px;padding:0}
.ack-col li{margin:0 0 9px;line-height:1.45}
.ack-col li b{color:var(--text2);font-weight:600}.ack-col li b a{color:inherit;text-decoration:underline;text-decoration-color:var(--border2);text-underline-offset:2px}
.ack-col li b a:hover{color:var(--brand)}
.ack-by{font-size:12.5px}
.ack-lic{display:inline-block;font:600 10.5px var(--mono);padding:1px 6px;margin-left:4px;border-radius:5px;background:var(--surface3);color:var(--muted);vertical-align:1px}
.ack-use{display:block;font-size:12.5px}
.site-footer{display:grid;grid-template-columns:1fr auto;gap:18px 32px;align-items:center;margin-top:80px;padding:28px 0 6px;border-top:1px solid var(--border);max-width:1240px;color:var(--muted);font-size:13.5px}
.sf-brand{display:flex;align-items:center;gap:12px}.sf-brand b{color:var(--text);font-size:15px}.sf-brand p{margin:0}
.sf-links{display:flex;flex-wrap:wrap;gap:6px 20px}.sf-links a{color:var(--text2);font-weight:600}
.sf-copy{grid-column:1/-1;margin:0;font-size:12.5px}
.static{max-width:760px}.static h1{font-size:clamp(30px,4vw,42px);font-weight:800;margin-bottom:10px}
.static .lede{font-size:18px;color:var(--muted);margin:0 0 24px}
.static .prose{font-size:16px}
@media (max-width:640px){.site-footer{grid-template-columns:1fr}.ts-track{width:58px}[data-theme=dark] .ts-knob{transform:translateX(20px)}}
@media (max-width:480px){.topbar{gap:8px;padding:0 10px}.ts-btn #tsLabel{display:none}.ts-btn{padding:0 8px 0 6px}.top-actions{gap:6px}}

/* ---------- pattern instinct cards ---------- */
.pi{position:relative;margin:18px 0;padding:16px 20px;border-radius:16px;border:1px solid color-mix(in srgb,#ec4899 30%,var(--border));
  background:linear-gradient(135deg,color-mix(in srgb,#ec4899 8%,var(--surface)),color-mix(in srgb,var(--brand) 7%,var(--surface)))}
.pi-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.pi-head b{font:700 16px var(--display)}
.pi-badge{font:800 10px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:#fff;background:#ec4899;border-radius:999px;padding:3px 9px}
.pi p{margin:6px 0;color:var(--text2)}
.pi-i b,.pi-h b{display:inline-block;font:700 10.5px var(--mono);letter-spacing:.09em;text-transform:uppercase;margin-right:8px;color:#db2777}
.pi-h b{color:var(--brand)}
.pi-link{display:inline-block;margin-top:6px;font-weight:700;font-size:14px}
.pi.compact{margin:0 18px 10px;padding:10px 14px;border-radius:12px;display:flex;flex-direction:column;gap:3px;font-size:13.5px}
.pi.compact .pi-link{margin-top:2px;font-size:13px}
.pchip{font-size:12.5px;font-weight:700;color:#db2777;background:color-mix(in srgb,#ec4899 12%,transparent);border-radius:999px;padding:1px 10px}
.pchip:hover{text-decoration:none;background:color-mix(in srgb,#ec4899 20%,transparent)}
.ptag{font-size:11.5px;color:var(--muted);border:1px solid var(--border);border-radius:999px;padding:0 8px;white-space:nowrap}
@media (max-width:640px){.ptag{display:none}}
.pp-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:14px 0}
.pp-col{border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:12px 14px}
.pp-col h3{margin:0 0 8px;font-size:14px;display:flex;align-items:center;gap:8px}.pp-col h3 small{color:var(--muted);font-weight:500}
.pp-col ul{list-style:none;margin:0;padding:0}
.pp-col li a{display:flex;align-items:center;gap:8px;padding:5px 4px;border-radius:8px;color:var(--text);font-size:14px}
.pp-col li a:hover{background:var(--surface2);text-decoration:none}
.pp-col .st{width:15px;height:15px}

/* ---------- cheat-sheet "at a glance" ---------- */
.glance{margin:14px 0 26px}
.gl-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:14px}
.gl-when,.gl-key,.gl-cx{border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:14px 18px}
.gl-side{display:grid;gap:14px;align-content:start}
.glance h3.gl-h,.prose .glance h3.gl-h{margin:0 0 6px;font:700 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.gl-when ul{margin:0;padding-left:18px}.gl-when li{margin:5px 0}
.gl-key p,.gl-cx p{margin:0}
.gl-cx code{font-weight:700;color:var(--text)}
.gl-spot{margin:14px 0;padding:12px 18px;border-radius:14px;background:color-mix(in srgb,#ec4899 9%,var(--surface));border:1px solid color-mix(in srgb,#ec4899 28%,var(--border))}
.gl-spot b{font:700 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:#db2777;margin-right:8px}
.gl-table td.n,.cs-quick td.n{color:var(--muted);font-family:var(--mono);width:36px}
.gl-table td{vertical-align:middle}
.gl-read{font-weight:600}.gl-solve{font-weight:600;color:var(--muted)}
.cheatsheet h2{margin-top:52px}
.cs-pattern{border-top:1px solid var(--border);padding-top:18px;margin-top:26px}
.cs-pattern h3{display:flex;align-items:center;gap:10px;font-size:21px;margin:0 0 4px}
.cs-n{display:inline-grid;place-items:center;min-width:30px;height:30px;padding:0 6px;border-radius:9px;background:var(--track,var(--brand));color:#fff;font:800 13px var(--mono)}
.cs-sum{color:var(--muted);margin:4px 0 0!important}
.cs-hack{margin:6px 0!important}.cs-hack b{font:700 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--brand);margin-right:8px}
.cs-more{font-weight:700}
.cs-quick td{vertical-align:top}
@media (max-width:760px){.gl-grid{grid-template-columns:1fr}.gl-table th:nth-child(5),.gl-table td:nth-child(5){display:none}}
@media print{.ad,.toc,.doc-actions{display:none!important}.cs-pattern{break-inside:avoid}}
.cx-cell{font:600 13px var(--mono);color:var(--text2);min-width:170px}.gl-cx p{font:600 14px var(--mono);color:var(--text)}

/* ---------- home mission ---------- */
.mission{display:grid;grid-template-columns:1.25fr 1fr;gap:28px;align-items:start;max-width:1240px;margin:8px 0 18px;padding:28px 30px;border-radius:24px;
  background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);position:relative;overflow:hidden}
.mission::before{content:"";position:absolute;inset:0;background:radial-gradient(520px 240px at 0 0,color-mix(in srgb,var(--brand) 13%,transparent),transparent 70%);pointer-events:none}
.mission>*{position:relative}
.mi-text .kicker{color:var(--brand)}
.mi-text h2{font-size:clamp(22px,2.6vw,30px);font-weight:800;margin:0 0 12px}
.mi-text p{color:var(--text2);margin:0 0 12px;font-size:15.5px}
.mi-steps{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.mi-steps li{display:flex;gap:14px;padding:14px 16px;border-radius:16px;background:var(--surface2);border:1px solid var(--border)}
.mi-steps b{font-size:15px}.mi-steps p{margin:2px 0 4px;color:var(--muted);font-size:14px}
.mi-steps a{font-weight:700;font-size:13.5px}
.ms-n{flex:none;display:grid;place-items:center;width:32px;height:32px;border-radius:10px;color:#fff;font:800 14px var(--mono);background:linear-gradient(135deg,var(--brand),var(--brand2))}
.cat-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px}.cat-head a{font-weight:700;font-size:14px}
@media (max-width:900px){.mission{grid-template-columns:1fr;padding:22px}}

/* ---------- good reads ---------- */
.reads-hero{position:relative;padding:28px 0 8px;max-width:1100px}
.reads-hero h1{font-size:clamp(30px,4.6vw,48px);font-weight:800;letter-spacing:-.03em;margin:0 0 12px}
.reads-hero .kicker{color:#f97316}
.rh-stats{display:flex;gap:26px;margin-top:20px}.rh-stats b{display:block;font:800 22px var(--display)}.rh-stats span{font-size:12px;color:var(--muted)}
.rsec{max-width:1240px;margin-top:36px}
.rsec h2{font-size:22px;margin:0 0 4px}
.rsec-blurb{color:var(--muted);margin:0 0 14px}
.rsec.feat h2{margin-bottom:14px}
.rgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.rcard{position:relative;display:flex;flex-direction:column;gap:6px;padding:18px 18px 14px;border-radius:18px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:transform .15s,border-color .15s,box-shadow .15s}
.rcard:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--brand) 40%,var(--border));box-shadow:var(--shadow)}
.rcard[hidden]{display:none}
.rc-top{display:flex;justify-content:space-between;gap:8px;align-items:center}
.rc-cat{font:700 10.5px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.rc-feat{font-size:11.5px;font-weight:700;color:#d97706;background:color-mix(in srgb,#f59e0b 14%,transparent);border-radius:999px;padding:1px 8px}
.rcard h3{font-size:16.5px;line-height:1.35;margin:2px 0}
.rcard h3 a{color:var(--text)}
.rcard h3 a::after{content:"";position:absolute;inset:0;border-radius:18px}
.rc-src{display:flex;align-items:center;gap:8px;margin:0;font-size:13px;color:var(--muted);font-weight:600}
.rc-av{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:6px;font:800 11px var(--mono);color:#fff;background:linear-gradient(135deg,#f97316,#ec4899)}
.rc-sum{margin:4px 0 6px;color:var(--text2);font-size:14px;flex:1}
.rc-foot{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.rc-meta{font-size:12px;color:var(--muted)}
.rc-tags{display:flex;gap:4px;flex-wrap:wrap}.rc-tags span{font-size:11px;color:var(--muted);border:1px solid var(--border);border-radius:999px;padding:0 7px}
.rc-go{position:absolute;top:14px;right:16px;font-size:12px;font-weight:700;opacity:0;transition:opacity .15s}
.rcard:hover .rc-go{opacity:1}.rcard:hover .rc-feat{opacity:0}
.reads-toolbar{max-width:1240px;margin-top:34px}
.reads-chips{flex-wrap:wrap}.reads-chips small{opacity:.7;font-weight:500}
.rsec.no-match{display:none}

/* single-row header: compact search */
.search-btn{height:38px;padding:0 8px 0 11px;gap:8px}
.search-btn span{flex:none}
@media (max-width:1280px){.search-btn span,.search-btn kbd{display:none}.search-btn{width:38px;padding:0;justify-content:center}}
@media (max-width:1000px){.mainnav{margin-left:4px}}
@media (max-width:480px){.topbar{gap:6px}.mainnav{margin-left:0}}

/* compact cheat sheet */
.cheatsheet .cs-pattern{border-top:1px solid var(--border);padding-top:8px;margin-top:34px}
.cheatsheet .cs-pattern h2{display:flex;align-items:center;gap:12px;margin:22px 0 8px;font-size:24px}
.cheatsheet .cs-pattern h3.cs-sub,.prose .cs-pattern h3.cs-sub{display:block;margin:16px 0 4px;font:700 11.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.cs-probs{margin:6px 0 12px}.cs-probs td{vertical-align:middle}
.cs-key,.cs-spot,.cs-var{margin:8px 0}
.cs-spot{padding:10px 14px;border-radius:12px;background:color-mix(in srgb,#ec4899 8%,var(--surface));border:1px solid color-mix(in srgb,#ec4899 25%,var(--border))}
.cs-key b,.cs-spot b,.cs-var>b:first-child{color:var(--text)}
.cs-guides{font-size:14px;color:var(--muted)}

/* ---------- grouped tracks ---------- */
.vswitch{display:flex;align-items:center;gap:14px;flex-wrap:wrap;max-width:1100px;margin:0 0 16px}
.vs-title{font:700 11.5px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.vs-opts{display:flex;gap:4px;padding:4px;border-radius:14px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-sm)}
.vs-opt{display:flex;flex-direction:column;padding:8px 18px;border-radius:10px;color:var(--text2);line-height:1.25}
.vs-opt b{font-size:14.5px}.vs-opt small{font-size:12px;color:var(--muted)}
.vs-opt:hover{background:var(--surface2);text-decoration:none;color:var(--text)}
.vs-opt.on{background:color-mix(in srgb,var(--track) 13%,transparent);color:var(--text);box-shadow:inset 0 0 0 1.5px color-mix(in srgb,var(--track) 55%,transparent)}
.tgroup .tbadge{margin-bottom:8px}
.topts{display:grid;gap:10px;margin-top:12px}
.topt{position:relative;display:flex;flex-direction:column;gap:3px;padding:12px 14px;border-radius:14px;border:1px solid var(--border);background:var(--surface2);color:var(--text);transition:border-color .15s,transform .15s}
.topt:hover{text-decoration:none;border-color:color-mix(in srgb,var(--track) 55%,var(--border));transform:translateX(2px)}
.to-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px}.to-head b{font-size:15px}.to-head small{font-size:12px;color:var(--muted)}
.to-meta{font-size:12.5px;color:var(--text2)}
.topt .tprog{height:5px;border-radius:9px;background:var(--surface3);overflow:hidden;margin-top:4px}
.topt .tprog i{display:block;height:100%;width:0;background:var(--track);transition:width .4s}
.topt .tpct{font-size:11.5px;color:var(--muted)}
.tgroup:hover{transform:none}

/* typography: Assistant (text) + Lora (headings) */
h1,h2,h3,h4{letter-spacing:-.005em!important;font-weight:700}
.hero h1{font-weight:700;letter-spacing:-.015em!important;line-height:1.12}
.th-text h1,.doc-head h1,.reads-hero h1,.static h1{font-weight:700}
.brand{font-family:var(--display);font-weight:700;letter-spacing:0}
.mn-link,.btn,.chip,.tab,.act,.vs-opt b,.ts-btn{font-family:var(--font)}
.mn-link{font-size:15px}
.hero-stats b,.th-stats b,.rh-stats b,.ring b{font-family:var(--font);font-weight:800}
.prose,.idea,.lede,.lead{font-size:inherit}
.article .prose{font-size:17.5px}
.lead{font-size:19px}
/* group card: options side by side on wide cards */
.cat .tgrid:has(.tgroup){grid-template-columns:repeat(auto-fill,minmax(330px,1fr))}
.tgroup{grid-column:span 2}
.tgroup .topts{grid-template-columns:1fr 1fr}
@media (max-width:760px){.tgroup{grid-column:auto}.tgroup .topts{grid-template-columns:1fr}}

/* ---------- nav dropdowns (DSA, System Design) ---------- */
.mn-dd{position:relative;display:flex}
.mn-dd-btn .chev{width:14px;height:14px;color:var(--muted);transition:transform .15s}
.mn-dd:hover .mn-dd-btn .chev,.mn-dd.open .mn-dd-btn .chev,.mn-dd:focus-within .mn-dd-btn .chev{transform:rotate(180deg)}
.mn-sub{display:none;position:absolute;top:100%;left:-6px;padding-top:12px;z-index:70}
.mn-dd:hover .mn-sub,.mn-dd:focus-within .mn-sub,.mn-dd.open .mn-sub{display:block}
.mn-sub-in{min-width:270px;background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow-lg);padding:6px;animation:pop .14s ease}
.mn-sub-link{display:flex;flex-direction:column;gap:1px;padding:9px 12px;border-radius:11px;color:var(--text)}
.mn-sub-link b{font-size:15px;font-weight:700}.mn-sub-link small{font-size:12.5px;color:var(--muted)}
.mn-sub-link:hover{background:var(--surface2);text-decoration:none}
.mn-sub-link.active{background:color-mix(in srgb,var(--brand) 12%,transparent)}
.mn-sub-link.active b{color:color-mix(in srgb,var(--brand) 80%,var(--text))}
.mn-menu .mn-dd{flex-direction:column}
.mn-menu .mn-dd-btn .chev{display:none}
.mn-menu .mn-sub{display:block;position:static;padding:0 0 4px 10px}
.mn-menu .mn-sub-in{min-width:0;border:0;box-shadow:none;padding:0;background:none;animation:none;border-left:2px solid var(--border);border-radius:0}
.mn-menu .mn-sub-link{padding:6px 12px}.mn-menu .mn-sub-link small{display:none}

/* ---------- page container: no empty band on wide screens ---------- */
.page-wrap{max-width:1320px;margin:0 auto}
.has-sidebar .page-wrap{max-width:1280px}
.article-wrap{justify-content:center}
.cheatsheet{flex:1;max-width:980px}
.cheatsheet-page .toc{width:270px}
.tgroup .topts{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.cat .tgrid:has(.tgroup) .tgroup{grid-column:1/-1}
.diagram pre.mermaid[data-processed]{font-family:"Assistant","Segoe UI",sans-serif;font-size:14px}

/* ---------- in-browser code editor ---------- */
.ide{position:relative;border:1px solid var(--border);border-radius:16px;background:var(--surface);box-shadow:var(--shadow);overflow:visible;margin-bottom:8px}
.ide-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 10px 8px 12px;border-bottom:1px solid var(--border);position:relative}
.ide-lang{display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 12px;border-radius:9px;background:var(--surface2);font-weight:700;font-size:14px}
.java-dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,#f89820,#e76f00)}
.ide-tools{display:flex;align-items:center;gap:2px}
.ide-btn{display:inline-flex;align-items:center;gap:6px;height:32px;min-width:32px;justify-content:center;padding:0 7px;border:0;border-radius:8px;background:none;color:var(--muted);cursor:pointer}
.ide-btn:hover{background:var(--surface2);color:var(--text)}
.ide-btn svg{width:17px;height:17px}
.ide-timer span{font:600 13px var(--mono);font-variant-numeric:tabular-nums}
.ide-timer.on{color:var(--easy)}
.ide-sep{width:1px;height:20px;background:var(--border);margin:0 6px}
.ide-settings{position:absolute;right:10px;top:46px;z-index:30;display:grid;gap:10px;min-width:230px;padding:14px;border-radius:14px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-lg);font-size:14px}
.ide-settings label{display:flex;justify-content:space-between;align-items:center;gap:12px}
.ide-settings select{font:inherit;padding:3px 6px;border-radius:7px;border:1px solid var(--border);background:var(--surface2);color:var(--text)}
.ide-check{justify-content:flex-start!important}
.ide-tabs{display:flex;align-items:flex-end;gap:2px;padding:0 10px;border-bottom:1px solid var(--border);overflow-x:auto;scrollbar-width:none}
.ide-tab{position:relative;display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 12px;border:0;background:none;color:var(--muted);font:600 14px var(--font);cursor:pointer;white-space:nowrap}
.ide-tab.on{color:var(--text)}
.ide-tab.on::after{content:"";position:absolute;left:8px;right:8px;bottom:-1px;height:2.5px;border-radius:3px;background:var(--easy)}
.ide-x{font-style:normal;font-size:16px;line-height:1;opacity:0;color:var(--muted);padding:0 2px;border-radius:4px}
.ide-tab:hover .ide-x,.ide-tab.on .ide-x{opacity:.8}.ide-x:hover{background:var(--surface3);color:var(--text)}
.ide-add{height:30px;width:30px;margin:0 0 4px 4px;border:0;border-radius:8px;background:none;color:var(--muted);font-size:20px;cursor:pointer}
.ide-add:hover{background:var(--surface2);color:var(--text)}
.ide-body{height:360px;resize:vertical;overflow:hidden;min-height:220px;background:var(--surface)}
.ide-body .cm-editor{height:100%}
.ide-body .cm-editor.cm-focused{outline:none}
.ide-fallback{margin:0;padding:14px 18px;font:14px/1.6 var(--mono);color:var(--muted);white-space:pre;overflow:auto;height:100%}
.ide-textarea{width:100%;height:100%;border:0;outline:0;resize:none;padding:14px 18px;background:transparent;color:var(--text);font:14px/1.6 var(--mono);tab-size:4}
.ide-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:8px 14px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.ide-note.flash{color:var(--easy)}
.ide-submit{font-weight:700;font-size:13.5px}
.ide.full{position:fixed;inset:12px;z-index:95;margin:0;display:flex;flex-direction:column;box-shadow:var(--shadow-lg)}
.ide.full .ide-body{flex:1;height:auto;resize:none}
.ide-full-open{overflow:hidden}
.ide-full-open .ide.full::before{content:"";position:fixed;inset:-12px;z-index:-1;background:rgba(10,11,16,.55)}
.code-acts{display:flex;gap:6px}
.to-ide{border:1px solid var(--border);background:var(--surface);color:var(--muted);font:600 12px var(--font);padding:3px 10px;border-radius:8px;cursor:pointer;text-transform:none;letter-spacing:0}
.to-ide:hover{color:var(--text);border-color:var(--easy)}
@media (max-width:640px){.ide-body{height:300px}.ide-sep{display:none}.ide-timer span{display:none}}
@media print{.ide,#try-it{display:none!important}}
.ide .cm-scroller,.ide .cm-content,.ide-textarea{font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0}

/* pop-up editor for article snippets */
.ide-overlay{position:fixed;inset:0;z-index:95;display:flex;padding:28px;background:rgba(10,11,16,.55);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.ide-overlay .ide{flex:1;display:flex;flex-direction:column;width:100%;max-width:1100px;margin:0 auto;box-shadow:var(--shadow-lg)}
.ide-overlay .ide-body{flex:1;height:auto;resize:none}
.ide-close:hover{color:var(--hard)}
@media (max-width:640px){.ide-overlay{padding:8px}}

/* editor language badge colours */
.ide-lang[data-lang=sql] .java-dot{background:linear-gradient(135deg,#38bdf8,#0369a1)}
.ide-lang[data-lang=lua] .java-dot{background:linear-gradient(135deg,#818cf8,#1e3a8a)}

/* ---------- higher-contrast typography ---------- */
:root:not([data-theme=dark]){--text:#0a0c15;--text2:#1f2233;--muted:#4b4f63;--border:#dcdfe9;--border2:#c7cbd9;--bg:#f7f7fa}
[data-theme=dark]{--text:#f1f2f8;--text2:#d4d6e3;--muted:#a3a7bc}
body{font-weight:500}
p,li,td,.prose,.lead,.lede,.idea,.verdict,.rc-sum,.mi-text p{color:var(--text2)}
:root:not([data-theme=dark]) .lead,:root:not([data-theme=dark]) .lede{color:#2c3044}
[data-theme=dark] .lead,[data-theme=dark] .lede{color:#c3c6d6}
h1,h2,h3,h4,b,strong{color:var(--text)}
.tag,.tag.subtle,.crumbs,.crumbs a,.cs-guides,.rsec-blurb,.tcard p,.th-text .lead{color:var(--muted)}
.tag{border-color:var(--border2)}
:root:not([data-theme=dark]) .mn-link{color:#2a2d40}
:root:not([data-theme=dark]) .sb-sec li a{color:#3d4155}

/* ---------------- cheat sheets: hub, tabs, tick-off items ---------------- */
.sh-tabs{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 22px}
.sh-tabs a{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--muted);font-size:14px;font-weight:600;line-height:1.2}
.sh-tabs a i{width:8px;height:8px;border-radius:50%;background:var(--c)}
.sh-tabs a:hover{color:var(--text);border-color:var(--border2);text-decoration:none}
.sh-tabs a.on{color:var(--text);border-color:color-mix(in srgb,var(--c) 55%,var(--border));background:color-mix(in srgb,var(--c) 12%,var(--surface))}
.sh-tabs a.sh-all{border-style:dashed}
.sheet-page{--track:var(--track)}
.sh-progress{display:flex;align-items:center;gap:12px;margin:14px 0 6px;font-size:14px;color:var(--muted)}
.sh-bar{flex:1;max-width:320px;height:8px;border-radius:9px;background:var(--surface3);overflow:hidden}
.sh-bar i{display:block;height:100%;width:0;background:var(--track,var(--brand));transition:width .35s}
.sh-count b{color:var(--text)}
.sh-reset{border:0;background:none;color:var(--muted);font:inherit;font-size:13px;text-decoration:underline;cursor:pointer;padding:0}
.sheet .sh-group h2{margin:44px 0 4px}
.sh-blurb{color:var(--muted);margin:0 0 10px!important}
.sh-list{list-style:none;margin:0;padding:0}
.prose .sh-list>li.sh-item{margin:0}
.sh-item{display:flex;gap:14px;align-items:flex-start;padding:16px 0;border-top:1px solid var(--border)}
.sh-item:first-child{border-top:0}
.sh-main{flex:1;min-width:0}
.sh-main h3{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:19px;margin:0 0 4px!important;line-height:1.3}
.sh-main>p{margin:0 0 6px}
.sh-main ul{margin:4px 0 8px}
.sh-main li{margin:2px 0}
.sh-main .code{margin:10px 0 6px}
.sh-n{display:inline-grid;place-items:center;min-width:26px;height:26px;padding:0 5px;border-radius:8px;background:color-mix(in srgb,var(--track,var(--brand)) 14%,transparent);color:var(--track,var(--brand));font:800 12px var(--mono)}
.sh-tag{font:700 10.5px var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:3px 7px;border-radius:6px;background:var(--surface3);color:var(--muted)}
.sh-link{display:inline-block;font-weight:700;font-size:14.5px;margin-top:2px}
.sh-tick{position:relative;flex:none;width:24px;height:24px;margin-top:2px;cursor:pointer}
.sh-tick input{position:absolute;inset:0;opacity:0;margin:0;cursor:pointer}
.sh-tick span{position:absolute;inset:0;border-radius:7px;border:2px solid var(--border2);background:var(--surface);transition:background .15s,border-color .15s}
.sh-tick input:focus-visible+span{outline:2px solid var(--brand);outline-offset:2px}
.sh-tick input:checked+span{background:#16a34a;border-color:#16a34a}
.sh-tick input:checked+span::after{content:"";position:absolute;left:6px;top:2px;width:6px;height:11px;border:solid #fff;border-width:0 2.5px 2.5px 0;transform:rotate(45deg)}
.sh-item.done .sh-t{text-decoration:line-through;text-decoration-color:color-mix(in srgb,var(--muted) 60%,transparent);color:var(--muted)}
.sh-table{margin:12px 0 4px}
.sh-table td{vertical-align:top}
.sh-credit{font-size:13.5px;color:var(--muted);margin-top:28px!important;padding-top:12px;border-top:1px dashed var(--border)}
.sh-chips{list-style:none;padding:0!important;margin:10px 0 0!important;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:8px}
.prose .sh-chips>li{margin:0}
.sh-chip{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1px solid var(--border);border-radius:12px;background:var(--surface)}
.sh-chip a{display:flex;flex-direction:column;color:var(--text);line-height:1.3}
.sh-chip a:hover{text-decoration:none}.sh-chip a:hover b{color:var(--brand)}
.sh-chip small{color:var(--muted);font-size:13px}
.sh-chip.done{background:color-mix(in srgb,#16a34a 7%,var(--surface));border-color:color-mix(in srgb,#16a34a 35%,var(--border))}
.sheets-hub{max-width:1100px;margin:0 auto}
.hub-head{margin:8px 0 22px}.hub-head h1{font-size:clamp(32px,4.5vw,46px);margin:0 0 10px}
.hub-head .lead{max-width:760px;color:var(--muted);font-size:17.5px;margin:0}
.sh-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin:8px 0 10px}
.sh-card{position:relative;display:flex;flex-direction:column;gap:6px;padding:20px 20px 18px;border-radius:18px;background:var(--surface);border:1px solid var(--border);color:var(--text);box-shadow:var(--shadow);overflow:hidden;transition:transform .18s,border-color .18s}
.sh-card::before{content:"";position:absolute;inset:0 0 auto;height:4px;background:var(--c)}
.sh-card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--c) 45%,var(--border));text-decoration:none}
.shc-badge{align-self:flex-start;font:700 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:4px 8px;border-radius:7px;background:color-mix(in srgb,var(--c) 14%,transparent);color:color-mix(in srgb,var(--c) 75%,var(--text))}
.sh-card h2{font-size:20px;margin:4px 0 0;line-height:1.25}
.sh-card p{color:var(--muted);margin:0;font-size:15px;flex:1}
.shc-meta{font-size:13px;color:var(--muted);font-family:var(--mono)}
.shc-prog{height:6px;border-radius:9px;background:var(--surface3);overflow:hidden;margin-top:6px}
.shc-prog i{display:block;height:100%;width:0;background:var(--c);transition:width .4s}
.shc-pct{font-size:13px;color:var(--muted)}
@media (max-width:640px){.sh-item{gap:10px}.sh-main h3{font-size:17.5px}.sh-tabs{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin-right:-16px;padding-right:16px}.sh-tabs::-webkit-scrollbar{display:none}.sh-tabs a{flex:none;font-size:13px;padding:5px 10px}}
.sh-table td.mono{font-family:var(--mono);font-size:13.5px}
@media print{.sh-tabs,.sh-progress,.sh-tick{display:none!important}.sh-item{break-inside:avoid}}

.track-about{max-width:860px;margin:44px 0 0}.track-about h2{font-size:24px;margin:0 0 10px}

.ack-page{max-width:1100px}.ack-page .ack-grid{margin-top:22px;font-size:14.5px;color:var(--muted)}.ack-page .ack-col h2{margin:0 0 10px}

pre { line-height: 125%; }
td.linenos .normal { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: #666666; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
[data-theme="light"] .hl .hll { background-color: #ffffcc }
[data-theme="light"] .hl .c { color: #60A0B0; font-style: italic } /* Comment */
[data-theme="light"] .hl .err { border: 1px solid #F00 } /* Error */
[data-theme="light"] .hl .k { color: #007020; font-weight: bold } /* Keyword */
[data-theme="light"] .hl .o { color: #666 } /* Operator */
[data-theme="light"] .hl .ch { color: #60A0B0; font-style: italic } /* Comment.Hashbang */
[data-theme="light"] .hl .cm { color: #60A0B0; font-style: italic } /* Comment.Multiline */
[data-theme="light"] .hl .cp { color: #007020 } /* Comment.Preproc */
[data-theme="light"] .hl .cpf { color: #60A0B0; font-style: italic } /* Comment.PreprocFile */
[data-theme="light"] .hl .c1 { color: #60A0B0; font-style: italic } /* Comment.Single */
[data-theme="light"] .hl .cs { color: #60A0B0; background-color: #FFF0F0 } /* Comment.Special */
[data-theme="light"] .hl .gd { color: #A00000 } /* Generic.Deleted */
[data-theme="light"] .hl .ge { font-style: italic } /* Generic.Emph */
[data-theme="light"] .hl .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
[data-theme="light"] .hl .gr { color: #F00 } /* Generic.Error */
[data-theme="light"] .hl .gh { color: #000080; font-weight: bold } /* Generic.Heading */
[data-theme="light"] .hl .gi { color: #00A000 } /* Generic.Inserted */
[data-theme="light"] .hl .go { color: #888 } /* Generic.Output */
[data-theme="light"] .hl .gp { color: #C65D09; font-weight: bold } /* Generic.Prompt */
[data-theme="light"] .hl .gs { font-weight: bold } /* Generic.Strong */
[data-theme="light"] .hl .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
[data-theme="light"] .hl .gt { color: #04D } /* Generic.Traceback */
[data-theme="light"] .hl .kc { color: #007020; font-weight: bold } /* Keyword.Constant */
[data-theme="light"] .hl .kd { color: #007020; font-weight: bold } /* Keyword.Declaration */
[data-theme="light"] .hl .kn { color: #007020; font-weight: bold } /* Keyword.Namespace */
[data-theme="light"] .hl .kp { color: #007020 } /* Keyword.Pseudo */
[data-theme="light"] .hl .kr { color: #007020; font-weight: bold } /* Keyword.Reserved */
[data-theme="light"] .hl .kt { color: #902000 } /* Keyword.Type */
[data-theme="light"] .hl .m { color: #40A070 } /* Literal.Number */
[data-theme="light"] .hl .s { color: #4070A0 } /* Literal.String */
[data-theme="light"] .hl .na { color: #4070A0 } /* Name.Attribute */
[data-theme="light"] .hl .nb { color: #007020 } /* Name.Builtin */
[data-theme="light"] .hl .nc { color: #0E84B5; font-weight: bold } /* Name.Class */
[data-theme="light"] .hl .no { color: #60ADD5 } /* Name.Constant */
[data-theme="light"] .hl .nd { color: #555; font-weight: bold } /* Name.Decorator */
[data-theme="light"] .hl .ni { color: #D55537; font-weight: bold } /* Name.Entity */
[data-theme="light"] .hl .ne { color: #007020 } /* Name.Exception */
[data-theme="light"] .hl .nf { color: #06287E } /* Name.Function */
[data-theme="light"] .hl .nl { color: #002070; font-weight: bold } /* Name.Label */
[data-theme="light"] .hl .nn { color: #0E84B5; font-weight: bold } /* Name.Namespace */
[data-theme="light"] .hl .nt { color: #062873; font-weight: bold } /* Name.Tag */
[data-theme="light"] .hl .nv { color: #BB60D5 } /* Name.Variable */
[data-theme="light"] .hl .ow { color: #007020; font-weight: bold } /* Operator.Word */
[data-theme="light"] .hl .w { color: #BBB } /* Text.Whitespace */
[data-theme="light"] .hl .mb { color: #40A070 } /* Literal.Number.Bin */
[data-theme="light"] .hl .mf { color: #40A070 } /* Literal.Number.Float */
[data-theme="light"] .hl .mh { color: #40A070 } /* Literal.Number.Hex */
[data-theme="light"] .hl .mi { color: #40A070 } /* Literal.Number.Integer */
[data-theme="light"] .hl .mo { color: #40A070 } /* Literal.Number.Oct */
[data-theme="light"] .hl .sa { color: #4070A0 } /* Literal.String.Affix */
[data-theme="light"] .hl .sb { color: #4070A0 } /* Literal.String.Backtick */
[data-theme="light"] .hl .sc { color: #4070A0 } /* Literal.String.Char */
[data-theme="light"] .hl .dl { color: #4070A0 } /* Literal.String.Delimiter */
[data-theme="light"] .hl .sd { color: #4070A0; font-style: italic } /* Literal.String.Doc */
[data-theme="light"] .hl .s2 { color: #4070A0 } /* Literal.String.Double */
[data-theme="light"] .hl .se { color: #4070A0; font-weight: bold } /* Literal.String.Escape */
[data-theme="light"] .hl .sh { color: #4070A0 } /* Literal.String.Heredoc */
[data-theme="light"] .hl .si { color: #70A0D0; font-style: italic } /* Literal.String.Interpol */
[data-theme="light"] .hl .sx { color: #C65D09 } /* Literal.String.Other */
[data-theme="light"] .hl .sr { color: #235388 } /* Literal.String.Regex */
[data-theme="light"] .hl .s1 { color: #4070A0 } /* Literal.String.Single */
[data-theme="light"] .hl .ss { color: #517918 } /* Literal.String.Symbol */
[data-theme="light"] .hl .bp { color: #007020 } /* Name.Builtin.Pseudo */
[data-theme="light"] .hl .fm { color: #06287E } /* Name.Function.Magic */
[data-theme="light"] .hl .vc { color: #BB60D5 } /* Name.Variable.Class */
[data-theme="light"] .hl .vg { color: #BB60D5 } /* Name.Variable.Global */
[data-theme="light"] .hl .vi { color: #BB60D5 } /* Name.Variable.Instance */
[data-theme="light"] .hl .vm { color: #BB60D5 } /* Name.Variable.Magic */
[data-theme="light"] .hl .il { color: #40A070 } /* Literal.Number.Integer.Long */
pre { line-height: 125%; }
td.linenos .normal { color: #6e7681; background-color: #0d1117; padding-left: 5px; padding-right: 5px; }
span.linenos { color: #6e7681; background-color: #0d1117; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #e6edf3; background-color: #6e7681; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #e6edf3; background-color: #6e7681; padding-left: 5px; padding-right: 5px; }
[data-theme="dark"] .hl .hll { background-color: #6e7681 }
[data-theme="dark"] .hl .c { color: #8B949E; font-style: italic } /* Comment */
[data-theme="dark"] .hl .err { color: #F85149 } /* Error */
[data-theme="dark"] .hl .esc { color: #E6EDF3 } /* Escape */
[data-theme="dark"] .hl .g { color: #E6EDF3 } /* Generic */
[data-theme="dark"] .hl .k { color: #FF7B72 } /* Keyword */
[data-theme="dark"] .hl .l { color: #A5D6FF } /* Literal */
[data-theme="dark"] .hl .n { color: #E6EDF3 } /* Name */
[data-theme="dark"] .hl .o { color: #FF7B72; font-weight: bold } /* Operator */
[data-theme="dark"] .hl .x { color: #E6EDF3 } /* Other */
[data-theme="dark"] .hl .p { color: #E6EDF3 } /* Punctuation */
[data-theme="dark"] .hl .ch { color: #8B949E; font-style: italic } /* Comment.Hashbang */
[data-theme="dark"] .hl .cm { color: #8B949E; font-style: italic } /* Comment.Multiline */
[data-theme="dark"] .hl .cp { color: #8B949E; font-weight: bold; font-style: italic } /* Comment.Preproc */
[data-theme="dark"] .hl .cpf { color: #8B949E; font-style: italic } /* Comment.PreprocFile */
[data-theme="dark"] .hl .c1 { color: #8B949E; font-style: italic } /* Comment.Single */
[data-theme="dark"] .hl .cs { color: #8B949E; font-weight: bold; font-style: italic } /* Comment.Special */
[data-theme="dark"] .hl .gd { color: #FFA198; background-color: #490202 } /* Generic.Deleted */
[data-theme="dark"] .hl .ge { color: #E6EDF3; font-style: italic } /* Generic.Emph */
[data-theme="dark"] .hl .ges { color: #E6EDF3; font-weight: bold; font-style: italic } /* Generic.EmphStrong */
[data-theme="dark"] .hl .gr { color: #FFA198 } /* Generic.Error */
[data-theme="dark"] .hl .gh { color: #79C0FF; font-weight: bold } /* Generic.Heading */
[data-theme="dark"] .hl .gi { color: #56D364; background-color: #0F5323 } /* Generic.Inserted */
[data-theme="dark"] .hl .go { color: #8B949E } /* Generic.Output */
[data-theme="dark"] .hl .gp { color: #8B949E } /* Generic.Prompt */
[data-theme="dark"] .hl .gs { color: #E6EDF3; font-weight: bold } /* Generic.Strong */
[data-theme="dark"] .hl .gu { color: #79C0FF } /* Generic.Subheading */
[data-theme="dark"] .hl .gt { color: #FF7B72 } /* Generic.Traceback */
[data-theme="dark"] .hl .g-Underline { color: #E6EDF3; text-decoration: underline } /* Generic.Underline */
[data-theme="dark"] .hl .kc { color: #79C0FF } /* Keyword.Constant */
[data-theme="dark"] .hl .kd { color: #FF7B72 } /* Keyword.Declaration */
[data-theme="dark"] .hl .kn { color: #FF7B72 } /* Keyword.Namespace */
[data-theme="dark"] .hl .kp { color: #79C0FF } /* Keyword.Pseudo */
[data-theme="dark"] .hl .kr { color: #FF7B72 } /* Keyword.Reserved */
[data-theme="dark"] .hl .kt { color: #FF7B72 } /* Keyword.Type */
[data-theme="dark"] .hl .ld { color: #79C0FF } /* Literal.Date */
[data-theme="dark"] .hl .m { color: #A5D6FF } /* Literal.Number */
[data-theme="dark"] .hl .s { color: #A5D6FF } /* Literal.String */
[data-theme="dark"] .hl .na { color: #E6EDF3 } /* Name.Attribute */
[data-theme="dark"] .hl .nb { color: #E6EDF3 } /* Name.Builtin */
[data-theme="dark"] .hl .nc { color: #F0883E; font-weight: bold } /* Name.Class */
[data-theme="dark"] .hl .no { color: #79C0FF; font-weight: bold } /* Name.Constant */
[data-theme="dark"] .hl .nd { color: #D2A8FF; font-weight: bold } /* Name.Decorator */
[data-theme="dark"] .hl .ni { color: #FFA657 } /* Name.Entity */
[data-theme="dark"] .hl .ne { color: #F0883E; font-weight: bold } /* Name.Exception */
[data-theme="dark"] .hl .nf { color: #D2A8FF; font-weight: bold } /* Name.Function */
[data-theme="dark"] .hl .nl { color: #79C0FF; font-weight: bold } /* Name.Label */
[data-theme="dark"] .hl .nn { color: #FF7B72 } /* Name.Namespace */
[data-theme="dark"] .hl .nx { color: #E6EDF3 } /* Name.Other */
[data-theme="dark"] .hl .py { color: #79C0FF } /* Name.Property */
[data-theme="dark"] .hl .nt { color: #7EE787 } /* Name.Tag */
[data-theme="dark"] .hl .nv { color: #79C0FF } /* Name.Variable */
[data-theme="dark"] .hl .ow { color: #FF7B72; font-weight: bold } /* Operator.Word */
[data-theme="dark"] .hl .pm { color: #E6EDF3 } /* Punctuation.Marker */
[data-theme="dark"] .hl .w { color: #6E7681 } /* Text.Whitespace */
[data-theme="dark"] .hl .mb { color: #A5D6FF } /* Literal.Number.Bin */
[data-theme="dark"] .hl .mf { color: #A5D6FF } /* Literal.Number.Float */
[data-theme="dark"] .hl .mh { color: #A5D6FF } /* Literal.Number.Hex */
[data-theme="dark"] .hl .mi { color: #A5D6FF } /* Literal.Number.Integer */
[data-theme="dark"] .hl .mo { color: #A5D6FF } /* Literal.Number.Oct */
[data-theme="dark"] .hl .sa { color: #79C0FF } /* Literal.String.Affix */
[data-theme="dark"] .hl .sb { color: #A5D6FF } /* Literal.String.Backtick */
[data-theme="dark"] .hl .sc { color: #A5D6FF } /* Literal.String.Char */
[data-theme="dark"] .hl .dl { color: #79C0FF } /* Literal.String.Delimiter */
[data-theme="dark"] .hl .sd { color: #A5D6FF } /* Literal.String.Doc */
[data-theme="dark"] .hl .s2 { color: #A5D6FF } /* Literal.String.Double */
[data-theme="dark"] .hl .se { color: #79C0FF } /* Literal.String.Escape */
[data-theme="dark"] .hl .sh { color: #79C0FF } /* Literal.String.Heredoc */
[data-theme="dark"] .hl .si { color: #A5D6FF } /* Literal.String.Interpol */
[data-theme="dark"] .hl .sx { color: #A5D6FF } /* Literal.String.Other */
[data-theme="dark"] .hl .sr { color: #79C0FF } /* Literal.String.Regex */
[data-theme="dark"] .hl .s1 { color: #A5D6FF } /* Literal.String.Single */
[data-theme="dark"] .hl .ss { color: #A5D6FF } /* Literal.String.Symbol */
[data-theme="dark"] .hl .bp { color: #E6EDF3 } /* Name.Builtin.Pseudo */
[data-theme="dark"] .hl .fm { color: #D2A8FF; font-weight: bold } /* Name.Function.Magic */
[data-theme="dark"] .hl .vc { color: #79C0FF } /* Name.Variable.Class */
[data-theme="dark"] .hl .vg { color: #79C0FF } /* Name.Variable.Global */
[data-theme="dark"] .hl .vi { color: #79C0FF } /* Name.Variable.Instance */
[data-theme="dark"] .hl .vm { color: #79C0FF } /* Name.Variable.Magic */
[data-theme="dark"] .hl .il { color: #A5D6FF } /* Literal.Number.Integer.Long */