/* ====== Change the whole look from these tokens ====== */
/* Palette: low-glare, slightly cool neutrals (no pure white/black) with softened accents to reduce eye strain */
:root{
  color-scheme:light;
  --bar-h:56px;
  --bg:#EEF2F3; --surface:#FAFCFC; --ink:#1F2A33; --muted:#586873; --line:#D6DFE2;
  --hl:rgba(238,190,60,.38);
  --c1:#2F6FA3; --c2:#C4624A; --c3:#2E8B6E; --c4:#7A5FC0;   /* cluster accents */
  --def:#2F6FA3; --def-bg:#E4EFF7;
  --trap:#B83B62; --trap-bg:#FBEAEF;
  --mem:#2E8B6E; --mem-bg:#E3F3EC;
  --shadow:0 1px 2px rgba(20,40,60,.05),0 6px 18px rgba(20,40,60,.05);
  --r:14px; --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --pad:clamp(14px,3vw,56px);
  --k1:#4F5BD5; --k2:#0E8F8A; --k3:#8557E8; --k4:#D9730D; --k5:#2F80ED; --k6:#DB4479;   /* landing card colors */
}
[data-theme=dark]{
  color-scheme:dark;
  --bg:#11161B; --surface:#192027; --ink:#DCE4EA; --muted:#93A2AE; --line:#2A353E;
  --hl:rgba(232,190,70,.22);
  --c1:#7DB3E6; --c2:#F0997B; --c3:#6ED0AA; --c4:#B7A0F0;
  --def:#7DB3E6; --def-bg:#172433;
  --trap:#F08AAB; --trap-bg:#2B1A23;
  --mem:#6ED0AA; --mem-bg:#132621;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 6px 18px rgba(0,0,0,.22);
  --k1:#8C96FF; --k2:#4FD1C5; --k3:#B79CFF; --k4:#FFB35C; --k5:#6FB2FF; --k6:#FF86AE;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--bar-h) + 16px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:clamp(16px,.3vw + 14.8px,19px)/1.75 var(--font);transition:background .25s,color .25s;-webkit-font-smoothing:antialiased;overflow-wrap:break-word}
a{color:inherit}
button{font:inherit;color:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}
:focus-visible{outline:2px solid var(--c1);outline-offset:2px}

/* top bar */
.bar{position:sticky;top:0;z-index:20;height:var(--bar-h);display:flex;align-items:center;gap:12px;padding:0 max(var(--pad),env(safe-area-inset-right)) 0 max(var(--pad),env(safe-area-inset-left));background:color-mix(in srgb,var(--bg) 86%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.prog{position:absolute;left:0;bottom:-1px;height:3px;width:0;background:linear-gradient(90deg,var(--c1),var(--c3));border-radius:0 3px 3px 0}
.brand{font-weight:700;text-decoration:none;letter-spacing:-.01em;white-space:nowrap}
.crumb a{text-decoration:none}.crumb a:hover{color:var(--ink)}
.crumb{color:var(--muted);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.tools{margin-left:auto;display:flex;gap:8px;flex:none}
.tools button{min-height:42px;min-width:42px;padding:0 14px;border:1px solid var(--line);background:var(--surface);border-radius:10px;font-size:14px;transition:border-color .2s,background .2s}
.tools button:hover{border-color:var(--c1)}
#toc-btn{display:none}
#theme-btn{display:inline-grid;place-items:center;padding:0;width:42px}
#theme-btn svg{display:block;transition:transform .3s}
#theme-btn:hover svg{transform:rotate(18deg)}
#theme-btn .ic-sun,[data-theme=dark] #theme-btn .ic-moon{display:none}
[data-theme=dark] #theme-btn .ic-sun{display:block}

/* layout: uses the full screen width */
.shell{width:100%;max-width:none;margin:0;padding:0 var(--pad);display:grid;grid-template-columns:clamp(220px,17vw,300px) minmax(0,1fr);gap:clamp(24px,3vw,56px)}
.toc{position:sticky;top:var(--bar-h);align-self:start;max-height:calc(100vh - var(--bar-h));max-height:calc(100dvh - var(--bar-h));overflow:auto;padding:24px 6px 24px 0;font-size:14px;line-height:1.5;overscroll-behavior:contain;scrollbar-width:thin}
.toc a{display:block;padding:6px 0 6px 12px;color:var(--muted);text-decoration:none;border-left:2px solid var(--line);transition:color .15s}
.toc a:hover{color:var(--ink)}
.toc .cl{margin-top:14px;font-weight:600;color:var(--ink);border-left-color:var(--ac)}
main{width:100%;max-width:none;padding:32px 0 96px;min-width:0}

/* unit header */
.unit h1{font-size:clamp(28px,4.5vw,46px);line-height:1.15;letter-spacing:-.02em;margin:0 0 8px}
.unit .sub{color:var(--muted);margin:0 0 20px}
.flow{white-space:pre-line;padding:16px 20px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);color:var(--muted);font-size:.95em;box-shadow:var(--shadow)}

/* clusters + keywords: cards flow into columns on wide screens */
.cluster{margin-top:56px;--ac:var(--c1);display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,520px),1fr));gap:16px;align-items:start}
.cluster>h2,.cluster>.tw{grid-column:1/-1}
.cluster h2{font-size:clamp(20px,2vw,26px);letter-spacing:-.01em;margin:0 0 4px;padding-left:12px;border-left:4px solid var(--ac);line-height:1.3}
.kw{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);min-width:0}
.kw summary{list-style:none;cursor:pointer;padding:14px 18px;font-weight:650;display:flex;align-items:center;gap:10px;min-height:52px;-webkit-tap-highlight-color:transparent}
.kw summary::-webkit-details-marker{display:none}
.kw summary::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--ac);flex:none}
.kw summary::after{content:"+";margin-left:auto;color:var(--muted);font-weight:400;font-size:22px;line-height:1}
.kw[open] summary::after{content:"–"}
.kw .body{padding:0 18px 18px}
.kw p{margin:0 0 10px}
.kw ul{margin:0 0 10px;padding-left:20px}
.kw li{margin-bottom:4px}
mark{background:var(--hl);color:inherit;font-weight:600;padding:1px 4px;border-radius:4px;-webkit-box-decoration-break:clone;box-decoration-break:clone}

/* callouts */
.box{margin:12px 0;padding:12px 14px;border-radius:10px;border-left:4px solid;font-size:.95em}
.def{background:var(--def-bg);border-color:var(--def)}
.trap{background:var(--trap-bg);border-color:var(--trap)}
.mem{background:var(--mem-bg);border-color:var(--mem)}

/* tables */
.tw{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:12px 0;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:.92em;line-height:1.5}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{background:color-mix(in srgb,var(--ac,var(--c1)) 14%,var(--surface));font-weight:650}
tr:last-child td{border-bottom:0}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--ink) 3%,transparent)}
.rev{margin-top:64px;--ac:var(--c3)}

/* landing page */
.home .shell{display:block}
.home .toc,.home #toc-btn{display:none}
.home::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(60vw 45vh at 8% -5%,color-mix(in srgb,var(--k1) 16%,transparent),transparent 70%),
             radial-gradient(50vw 40vh at 100% 0%,color-mix(in srgb,var(--k3) 12%,transparent),transparent 70%)}
.home main{padding-top:clamp(20px,4vw,44px)}
.hero{display:flex;align-items:flex-end;justify-content:space-between;gap:16px 32px;flex-wrap:wrap;padding-bottom:clamp(16px,2.5vw,26px)}
.hero h1{margin:0;font-size:clamp(30px,5vw,50px);line-height:1.08;letter-spacing:-.03em;font-weight:750;color:var(--k1);
  background:linear-gradient(100deg,var(--k1),var(--k5));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .sub{margin:6px 0 0;font-size:clamp(15px,1.6vw,18px);color:var(--muted)}
.search{width:min(100%,340px);min-height:46px;padding:0 16px;font:inherit;font-size:15px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);transition:border-color .2s,box-shadow .2s}
.search::placeholder{color:var(--muted)}
.search:focus{outline:none;border-color:var(--k1);box-shadow:0 0 0 3px color-mix(in srgb,var(--k1) 22%,transparent)}
.lib{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,360px),1fr));gap:12px}
.card{--k:var(--k1);position:relative;display:flex;align-items:center;gap:14px;padding:14px 16px;overflow:hidden;
  text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);
  transition:transform .18s,border-color .18s,box-shadow .18s}
.card::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:var(--k)}
.card::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,color-mix(in srgb,var(--k) 9%,transparent),transparent 55%);pointer-events:none}
.card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--k) 55%,var(--line));box-shadow:0 8px 22px color-mix(in srgb,var(--k) 16%,transparent)}
.card[hidden]{display:none}
.card .no{flex:none;display:grid;place-items:center;width:42px;height:42px;border-radius:11px;font-weight:700;font-size:15px;color:var(--k);background:color-mix(in srgb,var(--k) 15%,var(--surface))}
.card .tx{flex:1;min-width:0;position:relative;z-index:1}
.card .no,.card .go{position:relative;z-index:1}
.card b{display:block;font-size:16px;line-height:1.35;letter-spacing:-.005em}
.card small{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:1px;color:var(--muted);font-size:13.5px;line-height:1.45}
.back{display:inline-block;margin-bottom:8px;padding:6px 0;font-size:14px;color:var(--muted);text-decoration:none}
.back:hover{color:var(--ink)}
.subj{grid-template-columns:repeat(auto-fill,minmax(min(100%,440px),1fr));gap:16px}
.subj .card{align-items:flex-start;gap:18px;padding:22px 22px 22px 24px;border-radius:18px}
.subj .card .no{width:58px;height:58px;border-radius:15px;font-size:26px}
.subj .card .no svg{width:28px;height:28px}
.subj .card b{font-size:clamp(18px,2.2vw,22px)}
.subj .card small{font-size:14.5px;-webkit-line-clamp:3}
.subj .card .go{margin-top:14px}
.meta{display:inline-block;margin-top:10px;padding:3px 11px;border-radius:99px;font-size:13px;font-weight:600;color:var(--k);background:color-mix(in srgb,var(--k) 13%,var(--surface))}
.card .go{flex:none;color:var(--muted);font-size:18px;transition:transform .18s,color .18s}
.card:hover .go{transform:translateX(3px);color:var(--k)}
.empty{color:var(--muted)}

/* tablet + mobile */
@media(max-width:900px){
  .shell{display:block;padding:0 max(var(--pad),env(safe-area-inset-right)) 0 max(var(--pad),env(safe-area-inset-left))}
  #toc-btn{display:inline-block}
  .toc{display:none;position:fixed;left:0;right:0;top:var(--bar-h);bottom:auto;height:calc(100vh - var(--bar-h));height:calc(100dvh - var(--bar-h));max-height:none;z-index:15;background:var(--bg);padding:16px 24px calc(120px + env(safe-area-inset-bottom));font-size:16px;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;touch-action:pan-y;overscroll-behavior:contain}
  body.toc-open{overflow:hidden}
  .toc.open{display:block}
  .toc a{padding:11px 0 11px 14px}
  main{padding:20px 0 calc(72px + env(safe-area-inset-bottom))}
  .cluster{margin-top:40px}
}
@media(max-width:600px){
  .hero{align-items:stretch}.search{width:100%}
  .lib{grid-template-columns:minmax(0,1fr);gap:10px}
  .card{padding:12px 14px}
  .subj .card{padding:16px}.subj .card .no{width:48px;height:48px;font-size:22px}.subj .card .no svg{width:24px;height:24px}
  .bar{gap:8px}
  .crumb .ct{display:none}
  .cluster{grid-template-columns:minmax(0,1fr);gap:12px}
  .kw summary{padding:14px 16px}
  .kw .body{padding:0 16px 16px}
  th,td{padding:9px 10px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}.card:hover,.card:hover .go{transform:none}}
@media print{
  :root,[data-theme=dark]{--bg:#fff;--surface:#fff;--ink:#000;--muted:#333;--line:#ccc;--shadow:none}
  .bar,.toc{display:none}.shell{display:block;padding:0}
  .cluster{display:block}
  .kw{break-inside:avoid;margin-bottom:12px}.kw .body{display:block}
  *{print-color-adjust:exact;-webkit-print-color-adjust:exact}
}
/* strategy button (landing page) + embedded strategy page */
.strat-btn{display:inline-flex;align-items:center;gap:10px;min-height:46px;padding:0 16px 0 8px;font-size:15px;font-weight:650;letter-spacing:-.005em;color:var(--ink);text-decoration:none;white-space:nowrap;background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);transition:transform .18s,border-color .18s,box-shadow .18s}
.strat-btn .si{display:grid;place-items:center;width:32px;height:32px;border-radius:9px;color:var(--k4);background:color-mix(in srgb,var(--k4) 15%,var(--surface))}
.strat-btn .go{color:var(--muted);font-size:18px;font-weight:400;transition:transform .18s,color .18s}
.strat-btn:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--k4) 55%,var(--line));box-shadow:0 8px 22px color-mix(in srgb,var(--k4) 16%,transparent)}
.strat-btn:hover .go{transform:translateX(3px);color:var(--k4)}
.strategy .shell{display:block;padding:0}
.strategy .toc,.strategy #toc-btn{display:none}
.strategy main{padding:0}
.sframe{display:block;width:100%;min-height:70vh;border:0;background:transparent;opacity:0;transition:opacity .25s}
.sframe.ready{opacity:1}
@media(max-width:600px){
  .strat-btn{position:relative;overflow:hidden;width:100%;justify-content:flex-start;gap:14px;min-height:56px;padding:10px 16px 10px 14px;border-radius:14px;background:linear-gradient(100deg,color-mix(in srgb,var(--k4) 9%,var(--surface)),var(--surface) 65%)}
  .strat-btn::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:var(--k4)}
  .strat-btn .si{width:38px;height:38px;border-radius:11px}
  .strat-btn .go{margin-left:auto}
}
@media(prefers-reduced-motion:reduce){.strat-btn:hover,.strat-btn:hover .go{transform:none}}
/* image viewer (zoom dialog) */
body:has(dialog.lb[open]){overflow:hidden}
.lb{position:fixed;inset:0;width:100vw;width:100dvw;height:100vh;height:100dvh;max-width:none;max-height:none;margin:0;padding:0;border:0;overflow:hidden;background:rgba(8,12,16,.95);color:#E8EEF2}
.lb:not([open]){display:none}
.lb::backdrop{background:#000}
.lb-stage{position:absolute;inset:0;display:flex;overflow:auto;padding:12px 12px 96px;touch-action:pan-x pan-y;overscroll-behavior:contain;outline:none;-webkit-overflow-scrolling:touch}
.lb-stage.pan{cursor:grab}
.lb-stage.grabbing{cursor:grabbing}
.lb-img{display:block;flex:none;margin:auto;max-width:none;background:#fff;border-radius:6px;box-shadow:0 10px 40px rgba(0,0,0,.5);-webkit-user-select:none;user-select:none;-webkit-user-drag:none}
.lb-cap{position:absolute;left:max(14px,env(safe-area-inset-left));top:max(14px,env(safe-area-inset-top));max-width:calc(100% - 96px);padding:7px 12px;border-radius:10px;font-size:14px;font-weight:600;line-height:1.3;background:rgba(30,38,46,.88);border:1px solid rgba(255,255,255,.14);pointer-events:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb-cap:empty{display:none}
.lb button{display:inline-grid;place-items:center;min-width:44px;min-height:44px;padding:0 10px;border:0;border-radius:10px;background:transparent;color:inherit;font-size:14px;font-weight:600}
.lb button:hover{background:rgba(255,255,255,.12)}
.lb-close{position:absolute;top:max(10px,env(safe-area-inset-top));right:max(10px,env(safe-area-inset-right));background:rgba(30,38,46,.88)!important;border:1px solid rgba(255,255,255,.14)!important}
.lb-tools{position:absolute;left:50%;bottom:max(16px,env(safe-area-inset-bottom));transform:translateX(-50%);display:flex;align-items:center;gap:2px;padding:5px;border-radius:14px;background:rgba(30,38,46,.9);border:1px solid rgba(255,255,255,.14);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.lb-pct{min-width:64px!important;font-variant-numeric:tabular-nums}