/* GoldTriEngine blog: built from the site's own tokens (style.css / theme.css). Prefix bl- */
.bl-wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.bl-crumbs{font:500 .7rem/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
.bl-crumbs a{color:var(--muted);text-decoration:none}.bl-crumbs a:hover{color:var(--fg)}
.bl-chip{display:inline-flex;align-items:center;gap:8px;font:600 .66rem/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--mint);border:1px solid var(--line-2);border-radius:99px;padding:7px 11px;text-decoration:none}
.bl-chip i{width:7px;height:7px;border-radius:50%;background:var(--mint)}
.bl-chip.gold{color:var(--gold)}.bl-chip.gold i{background:var(--gold)}
a.bl-chip:hover{border-color:var(--mint)}

/* article head */
.bl-head{padding:clamp(36px,6vw,72px) 0 8px}
.bl-head h1{font-size:clamp(2rem,4.6vw,3.3rem);line-height:1.08;margin:16px 0 14px;max-width:22ch;letter-spacing:-.02em}
.bl-head h1 em{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--gold)}
.bl-head h1::after{content:"";display:block;margin-top:16px;height:3px;width:86px;border-radius:3px;background:linear-gradient(90deg,var(--gold),var(--mint))}
.bl-answer{font-size:clamp(1.08rem,1.6vw,1.28rem);line-height:1.55;color:var(--fg-2);max-width:62ch;margin:0 0 20px}
.bl-meta{display:flex;flex-wrap:wrap;gap:8px 18px;font:500 .72rem/1.3 var(--mono);letter-spacing:.06em;color:var(--muted);align-items:center}
.bl-meta b{color:var(--fg);font-weight:600}

/* key numbers */
.bl-kn{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(180deg,var(--panel),var(--ink-2));overflow:hidden;margin:26px 0 8px;position:relative}
.bl-kn::after{content:"";position:absolute;left:0;right:0;top:0;height:2px;background:linear-gradient(90deg,transparent,var(--gold),var(--mint),transparent);background-size:200% 100%;animation:bl-slide 5s linear infinite;opacity:.8}
@keyframes bl-slide{to{background-position:-200% 0}}
.bl-kn>div{padding:18px 20px;border-left:1px solid var(--line)}.bl-kn>div:first-child{border-left:0}
.bl-kn b{display:block;font:600 clamp(1.4rem,2.6vw,2rem)/1 var(--mono);letter-spacing:-.02em;color:var(--fg);font-variant-numeric:tabular-nums}
.bl-kn b.u{color:var(--mint)}.bl-kn b.d{color:var(--red)}.bl-kn b.g{color:var(--gold)}
.bl-kn span{display:block;font:500 .62rem/1.35 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:8px}
.bl-kn small{display:block;margin-top:6px;font-size:.78rem;line-height:1.35;color:var(--fg-2)}

/* layout */
.bl-grid{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:44px;align-items:start;padding:20px 0 56px}
.bl-body{min-width:0;max-width:740px}
.bl-body>*{margin-left:0;margin-right:0}
.bl-body h2{font-size:clamp(1.45rem,2.6vw,1.95rem);line-height:1.15;margin:2.1em 0 .55em;letter-spacing:-.015em;scroll-margin-top:84px}
.bl-body h3{font-size:1.15rem;margin:1.6em 0 .4em;scroll-margin-top:84px}
.bl-body p,.bl-body li{font-size:1.06rem;line-height:1.72;color:var(--fg-2)}
.bl-body p{margin:0 0 1.05em}
.bl-body ul,.bl-body ol{padding-left:1.25em;margin:0 0 1.2em}.bl-body li{margin:.35em 0}
.bl-body strong{color:var(--fg)}
.bl-body a{color:var(--blue-hi,#2f5fd0);text-underline-offset:3px}
.bl-body code{font:.9em var(--mono);background:rgba(127,140,170,.12);border:1px solid var(--line);padding:1px 6px;border-radius:6px;color:var(--fg)}
.bl-aside{position:sticky;top:92px;font-size:.88rem}
.bl-toc{border:1px solid var(--line);border-radius:var(--r);padding:18px 18px 14px;background:linear-gradient(180deg,var(--panel),var(--ink-2))}
.bl-toc b{display:block;font:600 .64rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.bl-toc a{display:block;color:var(--fg-2);text-decoration:none;padding:7px 0 7px 12px;border-left:2px solid var(--line);line-height:1.35;transition:color .2s,border-color .2s}
.bl-toc a:hover,.bl-toc a.on{color:var(--fg);border-color:var(--gold)}
.bl-side-cta{margin-top:16px;border:1px solid var(--line);border-radius:var(--r);padding:16px;background:linear-gradient(180deg,var(--panel),var(--ink-2))}
.bl-side-cta p{font-size:.86rem;line-height:1.5;color:var(--fg-2);margin:0 0 12px}

/* figures */
.bl-fig{margin:1.8em 0;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(180deg,var(--panel),var(--ink-2));padding:20px 20px 16px;position:relative;overflow:hidden}
.bl-fig::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--gold),var(--mint));transition:width 1.1s cubic-bezier(.2,.8,.2,1)}
.bl-fig.in::before{width:100%}
.bl-fig h4{margin:0 0 4px;font-size:1.02rem;color:var(--fg)}
.bl-fig .bl-sub{font:500 .64rem/1.4 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
.bl-fig figcaption{font-size:.84rem;line-height:1.5;color:var(--muted);margin-top:10px}
.bl-svg{width:100%;height:auto;display:block;overflow:visible}
.bl-gl{stroke:var(--line);stroke-width:1}.bl-gl.z{stroke:var(--line-2);stroke-dasharray:3 4}
.bl-yt,.bl-xt,.bl-lt,.bl-cl{font:500 9.5px var(--mono);fill:var(--muted);letter-spacing:.03em}
.bl-bv{font:600 10px var(--mono);fill:var(--fg)}
.bl-cl{fill:var(--fg-2);font-size:10px}
.bl-lt.pos{fill:var(--mint)}.bl-lt.neg{fill:var(--red)}
.bl-bar{transform-box:fill-box;transform-origin:50% 100%}
.bl-bar.pos{fill:var(--mint)}.bl-bar.neg{fill:var(--red)}.bl-bar.gold{fill:var(--gold)}.bl-bar.mute{fill:var(--faint,#8a93a8)}
.bl-bar.neg.dn{transform-origin:50% 0}
.bl-line{fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.bl-line.pos{stroke:var(--mint)}.bl-line.neg{stroke:var(--red)}.bl-line.gold{stroke:var(--gold)}
.bl-area{opacity:.5}.bl-area.pos{fill:color-mix(in srgb,var(--mint) 22%,transparent)}.bl-area.neg{fill:color-mix(in srgb,var(--red) 22%,transparent)}.bl-area.gold{fill:color-mix(in srgb,var(--gold) 22%,transparent)}
.bl-end circle{fill:var(--mint)}.bl-end.neg circle{fill:var(--red)}.bl-end.gold circle{fill:var(--gold)}
.bl-ping{opacity:.25;transform-box:fill-box;transform-origin:center;animation:bl-ping 2s ease-out infinite}
@keyframes bl-ping{0%{transform:scale(.7);opacity:.4}100%{transform:scale(2.6);opacity:0}}
.bl-cone.q80{fill:color-mix(in srgb,var(--gold) 16%,transparent)}.bl-cone.q50{fill:color-mix(in srgb,var(--gold) 30%,transparent)}
.bl-med{fill:none;stroke:var(--gold);stroke-width:2;stroke-dasharray:4 4}
.bl-lv{stroke:var(--line-2);stroke-dasharray:2 4;stroke-width:1}
.bl-mk{stroke:var(--gold);stroke-dasharray:3 3;stroke-width:1}
.bl-path{fill:none;stroke-width:1.3;opacity:.5;stroke-linejoin:round}.bl-path.pos{stroke:var(--mint)}.bl-path.neg{stroke:var(--red)}
.bl-diag{stroke:var(--line-2);stroke-dasharray:4 4;stroke-width:1.2}
.bl-dot{fill:var(--gold);fill-opacity:.85;stroke:var(--panel);stroke-width:1.5}
/* motion: only when JS is on, so the charts are complete without it */
.bl-js .bl-line,.bl-js .bl-path{stroke-dasharray:1;stroke-dashoffset:1}
.bl-js .bl-fig.in .bl-line{stroke-dashoffset:0;transition:stroke-dashoffset 1.8s cubic-bezier(.2,.7,.2,1) calc(var(--i,0)*.25s + .15s)}
.bl-js .bl-fig.in .bl-path{stroke-dashoffset:0;transition:stroke-dashoffset 1.6s cubic-bezier(.2,.7,.2,1) calc(var(--i,0)*.09s)}
.bl-js .bl-area,.bl-js .bl-cone,.bl-js .bl-med{opacity:0}
.bl-js .bl-fig.in .bl-area{opacity:.5;transition:opacity 1.2s .9s}.bl-js .bl-fig.in .bl-cone,.bl-js .bl-fig.in .bl-med{opacity:1;transition:opacity 1s 1.2s}
.bl-js .bl-bar{transform:scaleY(0)}.bl-js .bl-fig.in .bl-bar{transform:scaleY(1);transition:transform .9s cubic-bezier(.2,.8,.2,1) calc(var(--i,0)*.06s + .1s)}
.bl-js .bl-bv,.bl-js .bl-end,.bl-js .bl-dot{opacity:0}.bl-js .bl-fig.in .bl-bv,.bl-js .bl-fig.in .bl-end,.bl-js .bl-fig.in .bl-dot{opacity:1;transition:opacity .6s calc(var(--i,0)*.06s + 1s)}
.bl-js .bl-fig.in .bl-end{transition-delay:1.9s}

/* callouts, tables, steps, faq */
.bl-call{border:1px solid var(--line);border-left:3px solid var(--mint);border-radius:var(--r-sm);padding:16px 18px;margin:1.6em 0;background:linear-gradient(180deg,var(--panel),var(--ink-2))}
.bl-call.warn{border-left-color:var(--red)}.bl-call.data{border-left-color:var(--gold)}
.bl-call b.t{display:block;font:600 .66rem/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--mint);margin-bottom:8px}
.bl-call.warn b.t{color:var(--red)}.bl-call.data b.t{color:var(--gold)}
.bl-call p{margin:0;font-size:1rem}
.bl-tw{overflow-x:auto;margin:1.6em 0;border:1px solid var(--line);border-radius:var(--r-sm)}
.bl-tw table{width:100%;border-collapse:collapse;font-size:.92rem}
.bl-tw th{font:600 .62rem/1.3 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--panel) 80%,transparent);white-space:nowrap}
.bl-tw td{padding:11px 14px;border-bottom:1px solid var(--line);color:var(--fg-2);font-variant-numeric:tabular-nums}
.bl-tw tr:last-child td{border-bottom:0}
.bl-tw td.h1{background:color-mix(in srgb,var(--mint) 14%,transparent);color:var(--fg)}.bl-tw td.h2{background:color-mix(in srgb,var(--gold) 16%,transparent);color:var(--fg)}.bl-tw td.h3{background:color-mix(in srgb,var(--red) 16%,transparent);color:var(--fg)}
.bl-steps{counter-reset:s;list-style:none;padding:0!important;margin:1.4em 0}
.bl-steps li{counter-increment:s;position:relative;padding:14px 16px 14px 56px;margin:10px 0;border:1px solid var(--line);border-radius:var(--r-sm);background:linear-gradient(180deg,var(--panel),var(--ink-2))}
.bl-steps li::before{content:counter(s);position:absolute;left:14px;top:12px;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font:600 .85rem var(--mono);color:#241a05;background:linear-gradient(135deg,var(--gold),#f3d792)}
.bl-faq{margin:1.4em 0}
.bl-faq details{border:1px solid var(--line);border-radius:var(--r-sm);margin:10px 0;background:linear-gradient(180deg,var(--panel),var(--ink-2))}
.bl-faq summary{cursor:pointer;padding:15px 18px;font-weight:600;color:var(--fg);list-style:none;display:flex;justify-content:space-between;gap:12px}
.bl-faq summary::after{content:"+";font:600 1.2rem var(--mono);color:var(--gold)}.bl-faq details[open] summary::after{content:"–"}
.bl-faq details p{margin:0;padding:0 18px 16px;font-size:1rem}
.bl-src{font-size:.88rem}.bl-src li{font-size:.92rem;margin:.3em 0}
.bl-disc{margin:2.2em 0 0;padding:16px 18px;border:1px dashed var(--line-2);border-radius:var(--r-sm);font-size:.84rem;line-height:1.55;color:var(--muted)}
.bl-author{display:flex;gap:16px;align-items:center;margin:2em 0 0;padding:18px;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(180deg,var(--panel),var(--ink-2))}
.bl-author .av{width:54px;height:54px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;font:600 1.2rem var(--sans);color:#241a05;background:linear-gradient(135deg,var(--gold),#f3d792);box-shadow:0 0 0 2px var(--panel),0 0 0 3.5px var(--gold)}
.bl-author p{margin:0;font-size:.94rem;line-height:1.55}.bl-author b{color:var(--fg)}

/* lists of posts */
.bl-cats{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0}
.bl-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;margin:26px 0 8px}
.bl-card{position:relative;display:flex;flex-direction:column;gap:12px;padding:22px;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(180deg,var(--panel),var(--ink-2));text-decoration:none;color:inherit;transition:transform .3s,border-color .3s,box-shadow .3s;overflow:hidden}
.bl-card::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--gold),var(--mint));transition:width .7s cubic-bezier(.2,.8,.2,1)}
.bl-card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:0 22px 50px -28px var(--gold)}.bl-card:hover::before{width:100%}
.bl-card h3{margin:0;font-size:1.22rem;line-height:1.25;color:var(--fg);letter-spacing:-.01em}
.bl-card p{margin:0;font-size:.95rem;line-height:1.55;color:var(--fg-2)}
.bl-card .bl-meta{margin-top:auto;padding-top:10px}
.bl-feature{display:grid;grid-template-columns:1.15fr 1fr;gap:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:linear-gradient(180deg,var(--panel),var(--ink-2));margin:26px 0;text-decoration:none;color:inherit;transition:border-color .3s,box-shadow .3s}
.bl-feature:hover{border-color:var(--line-2);box-shadow:0 26px 60px -34px var(--gold)}
.bl-feature .tx{padding:clamp(22px,3vw,38px);display:flex;flex-direction:column;gap:14px}
.bl-feature h2{margin:0;font-size:clamp(1.5rem,2.8vw,2.1rem);line-height:1.15;color:var(--fg)}
.bl-feature p{margin:0;color:var(--fg-2);line-height:1.6}
.bl-feature .vis{background:color-mix(in srgb,var(--gold) 8%,var(--panel));display:flex;align-items:center;justify-content:center;padding:18px;min-height:210px}
.bl-empty{border:1px dashed var(--line-2);border-radius:var(--r);padding:clamp(28px,5vw,52px);text-align:center}
.bl-related{margin-top:2.4em}.bl-related h2{font-size:1.4rem;margin:0 0 6px}

@media(max-width:940px){.bl-grid{grid-template-columns:minmax(0,1fr)}.bl-aside{position:static;order:-1}.bl-toc{display:none}.bl-feature{grid-template-columns:1fr}}
@media(max-width:560px){.bl-wrap{padding:0 16px}.bl-kn>div{padding:14px 14px}.bl-fig{padding:16px 12px 12px;margin-left:-4px;margin-right:-4px}.bl-body p,.bl-body li{font-size:1.02rem}.bl-yt,.bl-xt,.bl-lt,.bl-cl{font-size:12px}.bl-bv{font-size:12px}}
@media(prefers-reduced-motion:reduce){.bl-kn::after,.bl-ping{animation:none}.bl-js .bl-line,.bl-js .bl-path{stroke-dashoffset:0;stroke-dasharray:none}.bl-js .bl-area,.bl-js .bl-cone,.bl-js .bl-med,.bl-js .bl-bv,.bl-js .bl-end,.bl-js .bl-dot{opacity:1}.bl-js .bl-bar{transform:none}.bl-card,.bl-fig::before{transition:none}}

/* featured-card graphics (real data curve, or abstract rings for lessons) */
.bl-sp{max-width:420px}
.bl-spl{fill:none;stroke:var(--gold);stroke-width:3;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:1;stroke-dashoffset:1;animation:bl-draw 2.2s cubic-bezier(.2,.7,.2,1) .2s forwards}
.bl-sp.pos .bl-spl{stroke:var(--mint)}.bl-sp.neg .bl-spl{stroke:var(--red)}
.bl-spa{fill:color-mix(in srgb,var(--gold) 18%,transparent);opacity:0;animation:bl-fade 1.2s ease 1.2s forwards}
.bl-sp.pos .bl-spa{fill:color-mix(in srgb,var(--mint) 18%,transparent)}.bl-sp.neg .bl-spa{fill:color-mix(in srgb,var(--red) 18%,transparent)}
.bl-spd{fill:var(--gold)}.bl-sp.pos .bl-spd{fill:var(--mint)}.bl-sp.neg .bl-spd{fill:var(--red)}
.bl-ring{fill:none;stroke:var(--gold);stroke-width:1.6;opacity:0;animation:bl-fade .9s ease calc(var(--i)*.18s) forwards}
@keyframes bl-draw{to{stroke-dashoffset:0}}@keyframes bl-fade{to{opacity:.8}}
@media(prefers-reduced-motion:reduce){.bl-spl{animation:none;stroke-dashoffset:0}.bl-spa,.bl-ring{animation:none;opacity:.8}}