/* kW Calc category pages v2 - homepage colour scheme with icons, colour and graphics (no shadows) */
.cat{--ink:#0f172a;--mut:#526077;--line:#e3e8ef;--alt:#f6f8fb;--blue:#2563eb;--blue-d:#1d4ed8;--blue-t:#eef3ff;--c:#2563eb;--t:#eaf1ff;display:block;color:var(--ink);background:#fff}
.cat svg.i{width:1em;height:1em;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.cat a:focus-visible,.cat input:focus-visible,.cat summary:focus-visible{outline:3px solid #9bb8fb;outline-offset:2px}
.c-wrap{max-width:1180px;margin:0 auto;padding:0 1.5rem}
.cat [hidden]{display:none!important}

/* ---------- hero ---------- */
.c-hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#f2f6ff 0%,#fff 100%);padding:2rem 0 3rem}
.c-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(37,99,235,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(37,99,235,.06) 1px,transparent 1px);background-size:32px 32px;-webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 85%);mask-image:linear-gradient(180deg,#000 0%,transparent 85%);pointer-events:none}
.c-hero::after{content:"";position:absolute;width:520px;height:520px;right:-140px;top:-180px;border-radius:50%;background:radial-gradient(circle,var(--t) 0%,rgba(255,255,255,0) 70%);pointer-events:none}
.c-hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:3rem;align-items:center}
.c-crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;margin:0 0 1.3rem;font-size:.85rem;color:var(--mut)}
.c-crumbs a{color:var(--mut);text-decoration:none}
.c-crumbs a:hover{color:var(--blue-d);text-decoration:underline}
.c-crumbs span[aria-hidden]{color:#94a3b8}
.c-crumbs [aria-current]{color:var(--ink);font-weight:600}
.c-eyebrow{display:inline-flex;align-items:center;gap:.45rem;margin:0 0 1rem;padding:.35rem .8rem .35rem .6rem;border-radius:999px;background:var(--t);color:var(--c);font-size:.84rem;font-weight:650}
.c-eyebrow .i{font-size:1rem}
.c-hero h1{margin:0 0 1rem;font-size:clamp(2rem,3.8vw,2.95rem);line-height:1.08;letter-spacing:-.035em;font-weight:780;color:var(--ink)}
.c-hl{color:var(--c)}
.c-lede{max-width:36rem;margin:0 0 1.6rem;font-size:1.08rem;line-height:1.6;color:var(--mut)}
.c-lede a{color:var(--blue-d)}
.c-search{position:relative;max-width:36rem}
.c-search .i{position:absolute;left:1rem;top:50%;transform:translateY(-50%);font-size:1.2rem;color:#7a879b;pointer-events:none}
.c-search input{width:100%;height:3.4rem;padding:0 1rem 0 2.9rem;font:inherit;font-size:1.02rem;color:var(--ink);background:#fff;border:1.5px solid #cdd6e3;border-radius:12px;-webkit-appearance:none;appearance:none;box-sizing:border-box}
.c-search input::placeholder{color:#8d99ab}
.c-search input:focus{border-color:var(--blue);outline:2px solid rgba(37,99,235,.35);outline-offset:1px}
.c-status{margin:.6rem 0 0;font-size:.88rem;font-weight:600;color:var(--blue-d)}
.c-status:empty{display:none}
.c-popular{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;margin:1rem 0 0;font-size:.88rem;color:var(--mut)}
.c-popular a{padding:.32rem .75rem;border:1px solid #d6deea;border-radius:999px;background:#fff;color:var(--ink);text-decoration:none;font-weight:500}
.c-popular a:hover{border-color:var(--c);color:var(--c);background:var(--t)}
/* hero graphic */
.c-art{position:relative;padding:1.25rem;border:1px solid var(--line);border-radius:20px;background:linear-gradient(155deg,var(--t) 0%,#fff 62%);overflow:hidden}
.c-art::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(15,23,42,.13) 1px,transparent 1.2px);background-size:16px 16px;-webkit-mask-image:radial-gradient(circle at 50% 42%,#000 0%,transparent 70%);mask-image:radial-gradient(circle at 50% 42%,#000 0%,transparent 70%)}
.c-art-stage{position:relative;height:230px}
.c-art-ring{position:absolute;left:50%;top:50%;border-radius:50%;border:1.5px dashed #c3cede;transform:translate(-50%,-50%)}
.c-art-ring.r1{width:150px;height:150px;border-color:var(--c);opacity:.35}
.c-art-ring.r2{width:250px;height:250px}
.c-art-main{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:92px;height:92px;border-radius:26px;background:var(--c);color:#fff;font-size:46px}
.c-art-main .i{stroke-width:1.8}
.c-art-f{position:absolute;display:grid;place-items:center;width:54px;height:54px;border-radius:16px;background:#fff;border:1.5px solid var(--t);color:var(--c);font-size:25px;animation:c-float 6s ease-in-out infinite}
.c-art-f::after{content:"";position:absolute;inset:6px;border-radius:11px;background:var(--t);z-index:-1}
.c-art-f.f1{left:9%;top:8%}
.c-art-f.f2{right:9%;top:14%;animation-delay:-1.5s}
.c-art-f.f3{left:14%;bottom:6%;animation-delay:-3s}
.c-art-f.f4{right:14%;bottom:2%;animation-delay:-4.5s}
@keyframes c-float{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
.c-art-stats{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.6rem;margin-top:.9rem}
.c-art-stats div{padding:.8rem .5rem;text-align:center;background:#fff;border:1px solid var(--line);border-radius:12px}
.c-art-stats strong{display:block;font-size:1.5rem;font-weight:780;letter-spacing:-.02em;color:var(--ink)}
.c-art-stats span{font-size:.78rem;color:var(--mut)}

/* ---------- topic bar ---------- */
.c-topicbar{position:sticky;top:64px;z-index:30;background:rgba(255,255,255,.96);border-top:1px solid var(--line);border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.c-topics{display:flex;gap:.5rem;margin:0;padding:.7rem 0;list-style:none;overflow-x:auto;scrollbar-width:thin}
.c-topics a{display:inline-flex;align-items:center;gap:.45rem;padding:.4rem .75rem .4rem .45rem;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--ink);text-decoration:none;font-size:.88rem;font-weight:550;white-space:nowrap}
.c-topics a .i{width:1.6rem;height:1.6rem;padding:.3rem;box-sizing:border-box;border-radius:50%;background:var(--t);color:var(--c)}
.c-topics em{font-style:normal;font-size:.75rem;font-weight:650;color:var(--mut)}
.c-topics a:hover{border-color:var(--c);background:var(--t)}

/* ---------- calculator list ---------- */
.c-cats{padding-top:.75rem;padding-bottom:3.5rem}
.c-topic{padding-top:2.25rem;scroll-margin-top:130px}
.c-topic-head{display:flex;align-items:center;gap:.7rem;margin:0 0 1rem}
.c-topic-ic{display:grid;place-items:center;width:2.5rem;height:2.5rem;border-radius:12px;background:var(--c);color:#fff;font-size:1.2rem;flex:none}
.c-topic-head h2{margin:0;font-size:1.3rem;font-weight:730;letter-spacing:-.02em;color:var(--ink)}
.c-count{font-size:.78rem;font-weight:650;color:var(--c);background:var(--t);border-radius:999px;padding:.15rem .55rem}
.c-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.8rem;margin:0;padding:0;list-style:none}
.c-card{position:relative;display:flex;align-items:flex-start;gap:.9rem;height:100%;box-sizing:border-box;padding:1rem 1.05rem;background:#fff;border:1px solid var(--line);border-radius:14px;color:var(--ink);text-decoration:none;overflow:hidden;transition:border-color .15s,background-color .15s}
.c-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--c);opacity:0;transition:opacity .15s}
.c-card:hover{border-color:var(--c);background:var(--t)}
.c-card:hover::before{opacity:1}
.c-ic{display:grid;place-items:center;width:2.6rem;height:2.6rem;border-radius:12px;background:var(--t);color:var(--c);font-size:1.25rem;flex:none;transition:background-color .15s,color .15s}
.c-card:hover .c-ic{background:var(--c);color:#fff}
.c-txt{display:flex;flex-direction:column;gap:.25rem;min-width:0;flex:1}
.c-txt strong{font-size:.98rem;font-weight:650;line-height:1.35}
.c-txt>span{font-size:.86rem;line-height:1.5;color:var(--mut);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.c-badge{display:inline-block;margin-left:.3rem;padding:.08rem .45rem;border-radius:999px;background:var(--c);color:#fff;font-size:.66rem;font-weight:700;letter-spacing:.03em;vertical-align:.15em;text-transform:uppercase}
.c-go{margin-top:.25rem;font-size:1rem;color:#a3aec0;transition:transform .15s,color .15s}
.c-card:hover .c-go{color:var(--c);transform:translateX(3px)}
.c-empty{margin-top:2rem;padding:2.25rem;text-align:center;background:var(--alt);border:1px dashed #cdd6e3;border-radius:14px;color:var(--mut)}
.c-empty .i{font-size:2rem;color:#94a3b8;margin-bottom:.5rem}
.c-empty strong{display:block;margin-bottom:.35rem;font-size:1.05rem;color:var(--ink)}
.c-empty p{margin:0}

/* ---------- content sections ---------- */
.c-content{display:block}
.p-section{padding:3.75rem 0;background:#fff}
.p-section.p-bg-alt{background:var(--alt)}
.p-section-inner{max-width:1180px;margin:0 auto;padding:0 1.5rem;text-align:left}
.p-section-head{max-width:46rem;margin:0 0 1.75rem;text-align:left}
.p-section-label{display:inline-flex;align-items:center;gap:.4rem;margin:0 0 .65rem;padding:.3rem .7rem;border-radius:999px;background:var(--t);color:var(--c);font-size:.74rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase}
.p-section-label .i{font-size:.95rem}
.p-section-title{display:block;margin:0;font-size:clamp(1.5rem,2.3vw,1.9rem);font-weight:740;letter-spacing:-.025em;line-height:1.2;color:var(--ink)}
.p-section-desc{max-width:46rem;margin:.6rem 0 0;font-size:1.03rem;line-height:1.6;color:var(--mut)}
.p-section-inner>.p-section-desc{margin-bottom:1.5rem}
.p-type-grid,.p-why-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.9rem}
.p-mistakes-grid,.p-glossary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:.9rem}
.p-compare-grid,.p-formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:.9rem}
.p-type-card,.p-why-card,.p-mistake-card,.p-gloss-card,.p-compare-card,.p-formula-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:14px;padding:1.25rem 1.25rem 1.3rem;transition:border-color .15s}
.p-type-card:hover,.p-why-card:hover,.p-compare-card:hover,.p-gloss-card:hover{border-color:#b9cbf7}
.p-type-card h3,.p-why-card h3,.p-mistake-card h3,.p-compare-card h3,.p-factor-card h3,.p-step-body h3{margin:.8rem 0 .35rem;font-size:1.02rem;font-weight:670;line-height:1.35;color:var(--ink)}
.p-type-card p,.p-why-card p,.p-mistake-card p,.p-compare-card p,.p-factor-card p,.p-step-body p,.p-formula-card p,.p-gloss-desc,.p-gloss-card dd{margin:0;font-size:.9rem;line-height:1.6;color:var(--mut)}
.p-type-icon,.p-why-icon,.p-factor-icon,.p-compare-icon{display:inline-grid;place-items:center;width:2.75rem;height:2.75rem;border-radius:13px;background:var(--t);color:var(--c);font-size:1.3rem;flex:none}
.p-why-card{text-align:left}
/* steps with connecting line */
.p-timeline{position:relative;counter-reset:step;display:grid;gap:.8rem;max-width:880px}
.p-timeline::before{content:"";position:absolute;left:1.2rem;top:1.2rem;bottom:1.2rem;width:2px;background:linear-gradient(var(--c),var(--t))}
.p-timeline-item{position:relative;display:grid;grid-template-columns:2.4rem minmax(0,1fr);gap:1rem;align-items:start}
.p-step-num{position:relative;z-index:1;counter-increment:step;display:grid;place-items:center;width:2.4rem;height:2.4rem;border-radius:50%;background:var(--c);color:#fff;font-weight:750;border:4px solid var(--alt);box-sizing:content-box;margin:-4px}
.p-section:not(.p-bg-alt) .p-step-num{border-color:#fff}
.p-step-num::before{content:counter(step)}
.p-step-body{background:#fff;border:1px solid var(--line);border-radius:14px;padding:1rem 1.2rem}
.p-step-body h3{margin-top:0}
/* formulas */
.p-formula-card{border-top:3px solid var(--c)}
.p-formula-label{display:inline-flex;align-items:center;gap:.35rem;font-size:.74rem;font-weight:750;letter-spacing:.07em;text-transform:uppercase;color:var(--c)}
.p-formula-math{margin:.75rem 0;padding:1rem;background:linear-gradient(135deg,var(--t),#fff);border:1px solid var(--line);border-radius:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:1.05rem;font-weight:700;color:var(--ink);text-align:center;overflow-x:auto}
/* guide */
.p-guide-wrap{position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:20px;padding:2.25rem}
.p-guide-wrap::before{content:"";position:absolute;right:-90px;bottom:-90px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,var(--t) 0%,rgba(255,255,255,0) 70%)}
.p-guide-layout{position:relative;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:2.5rem;align-items:start}
.p-guide-left h2,.p-guide-left h3:first-child{margin:0 0 .6rem;font-size:1.5rem;font-weight:740;letter-spacing:-.02em;color:var(--ink)}
.p-guide-left>p{margin:0 0 1.1rem;color:var(--mut);line-height:1.65}
.p-guide-left h3,.p-guide-left h4{font-size:1rem;font-weight:670;color:var(--ink);margin:1.2rem 0 .6rem}
.p-checklist{margin:0;padding:0;list-style:none;display:grid;gap:.1rem}
.p-checklist li{position:relative;padding:.6rem 0 .6rem 2rem;border-bottom:1px dashed var(--line);font-size:.94rem;color:#334155}
.p-checklist li:last-child{border-bottom:0}
.p-checklist li::before{content:"";position:absolute;left:0;top:.62rem;width:1.3rem;height:1.3rem;border-radius:50%;background:#16a34a url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center/.75rem no-repeat}
.p-guide-cta{margin-top:1.5rem}
.p-btn-solid{display:inline-flex;align-items:center;gap:.4rem;padding:.8rem 1.3rem;border-radius:10px;background:var(--blue);color:#fff;font-weight:650;font-size:.95rem;text-decoration:none;border:0}
.p-btn-solid:hover{background:var(--blue-d)}
.p-guide-right{display:grid;gap:.8rem}
.p-factor-card{display:flex;gap:.9rem;align-items:flex-start;background:var(--alt);border:1px solid var(--line);border-radius:14px;padding:1.05rem 1.15rem}
.p-factor-card h3{margin-top:0}
/* mistakes */
.p-mistake-card{border-top:3px solid #ef4444}
.p-mistake-top{display:flex;align-items:center;gap:.75rem}
.p-mistake-top h3{margin:0}
.p-mistake-icon{display:inline-grid;place-items:center;width:2.4rem;height:2.4rem;border-radius:12px;background:#fdecec;color:#dc2626;font-size:1.15rem;flex:none}
.p-mistake-card p{margin-top:.75rem}
.p-mistake-tag{display:inline-block;margin-top:.9rem;padding:.22rem .65rem;border-radius:999px;background:#fdecec;color:#b91c1c;font-size:.7rem;font-weight:750;letter-spacing:.05em;text-transform:uppercase}
/* comparisons */
.p-compare-icon-row{display:flex;align-items:center;gap:.8rem}
.p-compare-icon-row h3{margin:0}
.p-compare-tag{display:inline-block;margin-bottom:.15rem;padding:.12rem .5rem;border-radius:999px;background:var(--t);color:var(--c);font-size:.68rem;font-weight:750;letter-spacing:.05em;text-transform:uppercase}
.p-compare-card p{margin-top:.8rem}
/* glossary */
.p-gloss-card{margin:0}
.p-gloss-abbr{display:inline-grid;place-items:center;min-width:3rem;height:2.2rem;padding:0 .6rem;box-sizing:border-box;border-radius:10px;background:var(--t);color:var(--c);font-size:.8rem;font-weight:800;letter-spacing:.04em}
.p-gloss-title,.p-gloss-card dt{display:block;margin:.75rem 0 .3rem;font-size:1.02rem;font-weight:670;color:var(--ink)}
.p-gloss-card dd{margin:0}
/* CTA band */
.c-cta{position:relative;overflow:hidden;background:linear-gradient(120deg,var(--c) 0%,#1e3a8a 100%);color:#fff;padding:2.75rem 0}
.c-cta::before,.c-cta::after{content:"";position:absolute;border-radius:50%;border:1.5px solid rgba(255,255,255,.18)}
.c-cta::before{width:340px;height:340px;right:-80px;top:-150px}
.c-cta::after{width:220px;height:220px;right:120px;bottom:-140px}
.c-cta-in{position:relative;z-index:1;display:flex;align-items:center;gap:1.5rem;flex-wrap:wrap}
.c-cta-ic{display:grid;place-items:center;width:3.4rem;height:3.4rem;border-radius:16px;background:rgba(255,255,255,.15);font-size:1.6rem;flex:none}
.c-cta-txt{flex:1 1 22rem}
.c-cta h2{margin:0 0 .35rem;font-size:clamp(1.3rem,2.2vw,1.65rem);font-weight:740;letter-spacing:-.02em;color:#fff}
.c-cta p{margin:0;color:rgba(255,255,255,.85);line-height:1.6}
.c-cta-btns{display:flex;flex-wrap:wrap;gap:.6rem}
.c-btn{display:inline-flex;align-items:center;gap:.45rem;padding:.8rem 1.15rem;border-radius:10px;font-weight:650;font-size:.95rem;text-decoration:none}
.c-btn-w{background:#fff;color:var(--ink)}
.c-btn-w:hover{background:#eef3ff}
.c-btn-o{border:1.5px solid rgba(255,255,255,.6);color:#fff}
.c-btn-o:hover{background:rgba(255,255,255,.12)}
/* FAQ - homepage style */
.p-faq-wrap{max-width:860px}
.p-faq-list{display:grid;gap:.6rem}
.p-faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;transition:border-color .15s}
.p-faq-item[open]{border-color:var(--c)}
.p-faq-item summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:1rem 1.2rem;font-weight:620;font-size:1rem;color:var(--ink)}
.p-faq-item summary::-webkit-details-marker{display:none}
.p-faq-item summary::after{content:"+";display:grid;place-items:center;width:1.6rem;height:1.6rem;flex:none;border-radius:50%;background:var(--t);color:var(--c);font-size:1.15rem;font-weight:600;line-height:1}
.p-faq-item[open] summary::after{content:"\2212";background:var(--c);color:#fff}
.p-faq-title{margin:0;font-size:1rem;font-weight:620}
.p-faq-icon{display:none}
.p-faq-body{padding:0 1.2rem 1.1rem;color:var(--mut);line-height:1.65}
.p-faq-body p{margin:0 0 .6rem}
.p-faq-body p:last-child{margin:0}
/* related categories */
.c-explore{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.8rem;margin:1.5rem 0 0;padding:0;list-style:none}
.c-explore a{position:relative;display:flex;align-items:center;gap:.85rem;padding:.95rem 1rem;background:#fff;border:1px solid var(--line);border-radius:14px;color:var(--ink);text-decoration:none;transition:border-color .15s,background-color .15s}
.c-explore a:hover{border-color:var(--c);background:var(--t)}
.c-explore a:hover .c-ic{background:var(--c);color:#fff}
.c-explore .c-txt>span{-webkit-line-clamp:1}
.wiki-link{color:var(--blue-d);text-decoration:underline;text-decoration-color:#c9d8f7;text-underline-offset:2px}
.wiki-link:hover{text-decoration-color:currentColor}
.author-card-modern{background:#fff!important;border:1px solid #e3e8ef!important;border-radius:14px!important;box-shadow:none!important}
.author-card-modern::before{display:none!important}

@media (max-width:980px){.c-hero-grid{grid-template-columns:minmax(0,1fr);gap:2rem}.c-art{max-width:560px}.c-list{grid-template-columns:repeat(2,minmax(0,1fr))}.p-guide-layout{grid-template-columns:minmax(0,1fr)}}
@media (max-width:640px){
.c-wrap,.p-section-inner{padding:0 1rem}
.c-hero{padding:1.25rem 0 2.25rem}
.c-art{padding:.75rem;background:#fff}.c-art::before{display:none}.c-art-stage{display:none}.c-art-stats{margin-top:0}
.c-art-ring.r2{width:210px;height:210px}
.c-art-main{width:76px;height:76px;font-size:38px;border-radius:22px}
.c-art-f{width:46px;height:46px;font-size:21px}
.c-topicbar{position:static}
.c-list{grid-template-columns:minmax(0,1fr);gap:.65rem}
.p-section{padding:2.75rem 0}
.p-guide-wrap{padding:1.35rem}
.c-cta-btns{width:100%}.c-btn{flex:1 1 auto;justify-content:center}
}
@media (prefers-reduced-motion:reduce){.c-art-f{animation:none}.c-card,.c-card::before,.c-ic,.c-go{transition:none}}

/* ===== v8 ===== */
.c-popular a{border-radius:8px}
.p-guide-wrap{margin-top:2.5rem}
.p-guide-left>h3:first-child,.p-guide-left>h2:first-child{font-size:1.55rem;font-weight:760;letter-spacing:-.02em;line-height:1.25;margin:0 0 .8rem}

/* step-by-step guide: heading on the left, one clean numbered list card on the right */
.p-section:has(.p-timeline) .p-section-inner{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:3rem;align-items:start}
.c-guide-side{position:sticky;top:140px}
.p-section:has(.p-timeline) .p-section-head{margin:0}
.p-timeline{display:block;max-width:none;margin:0;padding:.35rem 1.6rem;background:#fff;border:1px solid var(--line);border-radius:16px}
.p-timeline::before{display:none}
.p-timeline-item{display:grid;grid-template-columns:2.4rem minmax(0,1fr);gap:1.1rem;align-items:start;padding:1.25rem 0;border-bottom:1px solid var(--line)}
.p-timeline-item:last-child{border-bottom:0}
.p-step-num{width:2.4rem;height:2.4rem;margin:0;border:0;border-radius:50%;background:var(--t);color:var(--c);font-size:.95rem;font-weight:750;box-sizing:border-box}
.p-section:not(.p-bg-alt) .p-step-num{border:0}
.p-step-body{padding:.15rem 0 0;background:none;border:0;border-radius:0}
.p-step-body h3{margin:0 0 .3rem;font-size:1.02rem;font-weight:670;color:var(--ink)}
.p-step-body p{margin:0;font-size:.92rem;line-height:1.6;color:var(--mut)}

/* formulas: centred heading, simple equal cards */
.p-formulas .p-section-head{margin-left:auto;margin-right:auto;text-align:center}
.p-formulas .p-section-desc{margin-left:auto;margin-right:auto}
.p-formulas .p-formula-grid{max-width:1080px;margin:0 auto}
.p-formula-card{display:flex;flex-direction:column;text-align:left;border:1px solid var(--line);border-top:1px solid var(--line);border-radius:14px;padding:1.3rem 1.35rem 1.35rem}
.p-formula-label{display:block;font-size:.74rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--mut)}
.p-formula-math{margin:.75rem 0 .85rem;padding:.95rem 1rem;background:var(--alt);border:1px solid var(--line);border-left:3px solid var(--c);border-radius:10px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:1.02rem;font-weight:650;color:var(--ink);text-align:left;overflow-x:auto}
.p-formula-card p{margin:0;font-size:.9rem;line-height:1.6;color:var(--mut)}

/* FAQ: centred */
.p-section:has(.p-faq-list) .p-section-head{margin-left:auto;margin-right:auto;text-align:center}
.p-section:has(.p-faq-list) .p-section-desc{margin-left:auto;margin-right:auto}
.p-faq-wrap{max-width:860px;margin:0 auto}

@media (max-width:900px){.p-section:has(.p-timeline) .p-section-inner{grid-template-columns:minmax(0,1fr);gap:1.5rem}.c-guide-side{position:static}}
@media (max-width:640px){.p-timeline{padding:.25rem 1.1rem}.p-timeline-item{grid-template-columns:2.1rem minmax(0,1fr);gap:.85rem;padding:1.05rem 0}.p-step-num{width:2.1rem;height:2.1rem}}

/* step guide: left column helpers */
.c-guide-aside{margin-top:1.5rem;padding:1.25rem;background:#fff;border:1px solid var(--line);border-radius:16px}
.c-guide-meta{display:flex;flex-wrap:wrap;gap:.5rem;margin:0 0 1.1rem}
.c-guide-meta span{display:inline-flex;align-items:center;gap:.4rem;padding:.35rem .7rem;border-radius:8px;background:var(--t);color:var(--c);font-size:.84rem}
.c-guide-meta b{font-weight:700}
.c-guide-aside h3{margin:0 0 .6rem;font-size:.95rem;font-weight:700;color:var(--ink)}
.c-guide-aside ul{margin:0;padding:0;list-style:none;display:grid;gap:.15rem}
.c-guide-aside li a{display:flex;align-items:center;gap:.7rem;padding:.55rem .5rem;border-radius:10px;color:var(--ink);text-decoration:none;font-size:.93rem;font-weight:550}
.c-guide-aside li a>span:not(.c-ic){flex:1;min-width:0}
.c-guide-aside .c-ic{width:2.1rem;height:2.1rem;border-radius:9px;font-size:1rem}
.c-guide-aside li a:hover{background:var(--alt)}
.c-guide-aside li a:hover .c-go{color:var(--c);transform:translateX(3px)}
.c-guide-all{display:inline-flex;align-items:center;gap:.35rem;margin-top:.9rem;font-size:.9rem;font-weight:650;color:var(--blue-d);text-decoration:none}
.c-guide-all:hover{text-decoration:underline}