:root{--wrap:1240px}
/* ---------- header ---------- */
.site-header .bar{gap:16px;min-height:76px}
.nav{gap:4px}
.nav .nav-link,.nav>a:not(.btn){display:inline-flex;align-items:center;gap:7px;min-height:42px;padding:0 14px;border:0;border-radius:var(--r-sm);background:none;font:600 15.5px var(--f-body);color:var(--muted);text-decoration:none;cursor:pointer}
.nav .nav-link:hover,.nav>a:not(.btn):hover,.has-mega.is-open .nav-link{color:var(--ink);background:var(--tint)}
.has-mega.is-open .nav-link svg{transform:rotate(180deg)}
.nav-search{position:relative;margin:0 8px 0 10px}
.nav-search input{width:210px;min-height:42px;padding:0 42px 0 16px;border:1px solid var(--line);border-radius:999px;background:var(--bg);font:400 15px var(--f-body);color:var(--ink);transition:width .2s ease,background .2s}
.nav-search input:focus{width:270px;background:#fff;outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.nav-search button{position:absolute;right:4px;top:4px;width:34px;height:34px;border:0;border-radius:50%;background:transparent;color:var(--muted);display:grid;place-items:center;cursor:pointer}
.nav-search button:hover{color:var(--accent-ink)}
.mega{position:absolute;left:0;right:0;top:100%;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);box-shadow:0 18px 30px -22px rgba(14,27,61,.35)}
.mega[hidden]{display:none}
.mega-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px 32px;padding-block:28px 12px}
.mega-col{display:flex;flex-direction:column;gap:2px;min-width:0}
.mega-col a{text-decoration:none;color:var(--muted);font-size:15px;padding:4px 0}
.mega-col a:hover{color:var(--ink);text-decoration:underline}
.mega-col .mega-head{display:flex;align-items:center;gap:10px;color:var(--ink);font:700 1.05rem var(--f-head);margin-bottom:4px}
.mega-ico{display:grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--tint);color:var(--accent-ink)}
.mega-col .mega-all{color:var(--accent-ink);font-weight:600;margin-top:2px}
.mega-foot{padding-block:8px 20px}.mega-foot a{font-weight:600;color:var(--accent-ink);text-decoration:none}.mega-foot a:hover{text-decoration:underline}
.site-header{position:sticky}
.nav-item{position:static}
.site-header .has-mega{position:static}
/* ---------- page grid: 70 / 30 ---------- */
.page-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,3fr);gap:32px;padding-top:28px;padding-bottom:72px;align-items:start}
.main-col{min-width:0}
.calc-head{margin-bottom:20px}
.calc-head h1{font-family:var(--f-head);font-weight:800;font-size:clamp(1.9rem,3.6vw,2.7rem);line-height:1.08;letter-spacing:-.02em}
.calc-head .lede{margin-top:10px;font-size:1.05rem;max-width:none}
.crumbs{margin-bottom:12px}
.side-col{align-self:stretch;display:flex;flex-direction:column;gap:20px;min-width:0}
.side-box{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:20px}
.side-box h2{font:800 1.05rem/1.2 var(--f-head);letter-spacing:-.005em;margin-bottom:12px}
.side-search{display:flex;gap:8px}
.side-search input{flex:1;min-width:0;min-height:42px;padding:0 14px;border:1px solid var(--line);border-radius:var(--r-md);font:400 15.5px var(--f-body);background:var(--bg);color:var(--ink)}
.side-search input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent);background:#fff}
.side-list{display:flex;flex-direction:column}
.side-list a{display:flex;align-items:center;gap:10px;padding:9px 0;border-top:1px solid var(--line);text-decoration:none;font-weight:600;font-size:15px;line-height:1.35;color:var(--ink)}
.side-list li:first-child a{border-top:0}
.side-list a:hover{color:var(--accent-ink)}
.side-list.num{counter-reset:n}
.side-list.num a::before{counter-increment:n;content:counter(n);flex:none;display:grid;place-items:center;width:24px;height:24px;border-radius:7px;background:var(--tint);color:var(--accent-ink);font-size:12.5px}
.subj-ico{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--tint);color:var(--accent-ink)}
.subj-ico svg{width:17px;height:17px}
.side-list.subj em{margin-left:auto;font-style:normal;font-weight:400;font-size:13px;color:var(--muted)}
.side-box--ink{background:var(--ink);border-color:var(--ink);color:#fff}
.side-box--ink p{color:#C6D1EC;font-size:15px;margin-bottom:14px}
.ad{text-align:center;overflow:hidden}
.ad-label{display:block;margin-bottom:6px;font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:#7A87A5}
.ad-empty{border:1.5px dashed #AEBBD8;border-radius:var(--r-md);padding:30px 14px;color:var(--muted);font-size:14px;background:rgba(255,255,255,.5)}
.main-col .ad{margin-top:24px}
.ad--side2{position:sticky;top:92px;margin-top:auto}
.ad--side2 .ad-empty{padding-block:120px}
/* ---------- calculator shell, article ---------- */
.calc-shell{margin:0}
.calc-notice{margin-top:16px;padding:12px 16px;border-radius:var(--r-md);background:var(--tint);color:var(--muted);font-size:14.5px}
.article{margin-top:28px;font-size:17.5px;line-height:1.78;padding:clamp(22px,4vw,48px)}
.article>*+*{margin-top:1.15em}
.article p,.article li{max-width:none}
.article h2{margin-top:1.9em;padding-top:0;border-top:0;font-family:var(--f-head);font-weight:800;font-size:clamp(1.45rem,2.6vw,1.9rem);line-height:1.15;letter-spacing:-.015em;scroll-margin-top:96px}
.article h3{margin-top:1.9em;font-family:var(--f-head);font-weight:700;font-size:1.28rem;line-height:1.22;scroll-margin-top:96px}
.article h2+*,.article h3+*{margin-top:.7em}
.article>.toc+*{margin-top:1.4em}
.article ul,.article ol{padding-left:1.4em}
.article li::marker{color:var(--accent-ink);font-weight:600}
.article li+li{margin-top:.5em}
.article strong{font-weight:600}
.article a{color:var(--accent-ink);text-underline-offset:3px}
.article table{display:block;overflow-x:auto;width:100%;border-collapse:collapse;font-size:15.5px;line-height:1.5}
.article th,.article td{padding:10px 14px;border:1px solid var(--line);text-align:left;vertical-align:top}
.article th{background:var(--tint);font-weight:600}
.article blockquote{padding:14px 20px;border-left:4px solid var(--accent);background:var(--bg);border-radius:0 var(--r-md) var(--r-md) 0;color:var(--muted)}
.article img{border-radius:var(--r-md)}
.toc{padding:18px 22px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--bg);font-size:15.5px;line-height:1.45}
.toc h2{margin:0;padding:0;border:0;font:800 .8rem/1 var(--f-body);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.toc ol{list-style:none;columns:2;column-gap:28px;margin:12px 0 0;padding:0}
.toc li{break-inside:avoid;padding:4px 0;margin:0}
.toc li+li{margin-top:0}
.toc a{color:var(--ink);text-decoration:none}.toc a:hover{color:var(--accent-ink);text-decoration:underline}
.faq-box,.related{margin-top:32px}
.faq-box h2,.related h2,.grid-title{font-family:var(--f-head);font-weight:800;font-size:1.5rem;letter-spacing:-.01em;margin:0 0 14px}
.faq-box details{border:1px solid var(--line);border-radius:var(--r-md);background:#fff;padding:0 18px;margin-bottom:8px}
.faq-box summary{cursor:pointer;padding:15px 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq-box summary::-webkit-details-marker{display:none}
.faq-box summary::after{content:"+";color:var(--accent-ink);font-size:1.4rem;line-height:1}
.faq-box details[open] summary::after{content:"\2212"}
.faq-box details p{padding:0 0 16px;color:var(--muted)}
/* ---------- cards, grids, lists ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.card-grid a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 16px;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);text-decoration:none;font-weight:600;font-size:15px;line-height:1.35;color:var(--ink);transition:border-color .12s,transform .12s}
.card-grid a::after{content:"\2192";color:var(--accent-ink);flex:none;opacity:.55}
.card-grid a:hover{border-color:var(--accent);transform:translateY(-1px)}
.card-grid a:hover::after{opacity:1}
.card-grid--lg{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.child-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin-bottom:32px}
.child-grid a{display:flex;flex-direction:column;gap:2px;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);text-decoration:none;color:var(--ink)}
.child-grid a:hover{border-color:var(--accent)}
.child-grid strong{font:700 1.05rem var(--f-head)}.child-grid span{color:var(--muted);font-size:14px}
.letters{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 24px}
.letters a{min-width:40px;padding:8px 10px;text-align:center;border:1px solid var(--line);border-radius:var(--r-md);background:#fff;color:var(--ink);text-decoration:none;font-weight:600;font-size:14.5px}
.letters a:hover,.letters a[aria-current]{background:var(--accent);border-color:var(--accent)}
.results{display:flex;flex-direction:column;gap:10px}
.results a{display:flex;flex-direction:column;gap:2px;padding:16px 20px;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);text-decoration:none;color:var(--ink)}
.results a:hover{border-color:var(--accent)}
.results strong{font:700 1.1rem var(--f-head)}.results span{color:var(--muted);font-size:15px}
.empty{padding:32px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg)}
.empty p+p{margin-top:16px}
.navigation.pagination{margin-top:28px}
.nav-links{display:flex;flex-wrap:wrap;gap:6px}
.page-numbers{min-width:42px;padding:9px 14px;text-align:center;border:1px solid var(--line);border-radius:var(--r-md);background:#fff;text-decoration:none;font-weight:600;font-size:15px}
a.page-numbers:hover{border-color:var(--accent)}
.page-numbers.current{background:var(--ink);border-color:var(--ink);color:#fff}
/* ---------- home ---------- */
.tile-ico{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:var(--tint);color:var(--accent-ink)}
.tile--ink .tile-ico{background:rgba(255,255,255,.1);color:#FFB487}
.tile--tint .tile-ico{background:#fff}
.tile--accent .tile-ico{background:rgba(26,13,2,.12);color:#1A0D02}
.tile h3 a{text-decoration:none}.tile h3 a:hover{text-decoration:underline}
.tile li a{text-decoration:none}.tile li a:hover{text-decoration:underline}
.tile--w6 .tile-ico{flex:none}
.section--pop{padding-bottom:8px}
/* ---------- footer ---------- */
.foot{grid-template-columns:minmax(0,1.5fr) repeat(4,minmax(0,1fr));gap:32px}
/* ---------- responsive ---------- */
@media (max-width:1100px){.nav-search input{width:150px}.nav-search input:focus{width:200px}.nav .nav-link,.nav>a:not(.btn){padding:0 10px}}
@media (max-width:1000px){
  .page-grid{grid-template-columns:1fr}
  .ad--side2{position:static}
  .js .nav-toggle{display:inline-flex;align-items:center}
  .js .nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;padding:8px var(--gut) 20px;background:#fff;border-bottom:1px solid var(--line);max-height:calc(100vh - 76px);overflow:auto}
  .js .nav.is-open{display:flex}
  .js .nav .nav-link,.js .nav>a:not(.btn){padding:14px 0;border-bottom:1px solid var(--line);font-size:17px;border-radius:0;justify-content:space-between;width:100%}
  .nav-search{margin:12px 0 0}.nav-search input,.nav-search input:focus{width:100%}
  .js .nav .btn{margin-top:16px}
  .mega{position:static;box-shadow:none;border:0}
  .mega-grid{grid-template-columns:1fr 1fr;padding:14px 0 4px;gap:18px}
  .mega .wrap{padding-inline:0}
  .mega-foot{padding-block:4px 10px}
  .foot{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}
}
@media (max-width:640px){.mega-grid{grid-template-columns:1fr}.toc ol{columns:1}.article{font-size:17px}}

/*unit-fix*/
.calc-form #basicCalculator>div{flex-wrap:wrap}
.calc-form #basicCalculator>div>input{flex:1 1 170px;min-width:0}
.calc-form #basicCalculator>div>select{flex:0 1 auto;width:auto;min-width:150px;max-width:100%;text-overflow:ellipsis}
.calc-form #basicCalculator>div>select:only-child{flex:1 1 100%}

/*hero-fill*/
.hero-grid{align-items:start}
.hero-chips{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0 0;padding:0;list-style:none}
.hero-chips a{display:inline-block;padding:8px 14px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font-weight:600;font-size:.9rem;text-decoration:none}
.hero-chips a:hover{border-color:var(--accent);color:var(--accent-ink)}
.hero-points{list-style:none;margin:26px 0 0;padding:0;display:grid;gap:12px}
.hero-points li{position:relative;padding-left:30px;color:var(--muted);line-height:1.45}
.hero-points li strong{color:var(--ink)}
.hero-points li:before{content:'';position:absolute;left:0;top:.2em;width:18px;height:18px;border-radius:50%;background:var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5 9.5l2.6 2.6L13 6.8' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/100% no-repeat}
.hero-pop{margin-top:30px;padding-top:22px;border-top:1px solid var(--line)}
.hero-pop h2{font-size:1rem;margin:0 0 10px;font-family:var(--f-head)}
.hero-pop ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:6px 18px}
.hero-pop a{color:var(--ink);font-weight:600;font-size:.92rem;text-decoration:none;display:block;padding:4px 0}
.hero-pop a:hover{color:var(--accent-ink)}
.hero .ti-calc{height:170px}
.hero .ti-keys .k{height:38px}
.hero .ti-keys{gap:6px}
.hero .ti84{padding:12px}
@media (max-width:1000px){.hero-pop ul{grid-template-columns:1fr}}

/*footer2*/
footer.site-footer{background:var(--ink);color:#aebbe0;border-top:0;margin-top:110px;padding:0;position:relative}
footer.site-footer .foot-cta{margin-top:-62px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:30px 36px;border-radius:var(--r-lg);background:linear-gradient(115deg,#F26A1B,#FF8F45);color:#fff;box-shadow:0 24px 50px -28px rgba(242,106,27,.8);max-width:calc(var(--wrap) - 2*var(--gut));position:relative;z-index:2}
footer.site-footer .foot-cta h2{font:800 1.5rem/1.2 var(--f-head);color:#fff;margin:0 0 6px}
footer.site-footer .foot-cta p{margin:0;color:#fff;opacity:.92;max-width:520px}
.foot-cta-btn{flex:none;background:#fff;color:var(--ink);font-weight:700;border-radius:999px;padding:14px 26px;text-decoration:none;transition:transform .15s}
.foot-cta-btn:hover{transform:translateY(-2px)}
footer.site-footer .foot{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1.3fr) repeat(3,minmax(0,1fr));gap:36px;padding-block:56px 44px}
footer.site-footer h2{font:700 .78rem/1 var(--f-body);text-transform:uppercase;letter-spacing:.1em;color:#fff;margin:0 0 16px}
footer.site-footer nav a{display:flex;align-items:center;gap:10px;color:#aebbe0;text-decoration:none;padding:6px 0;transition:color .15s,transform .15s}
footer.site-footer nav a:hover{color:#fff;transform:translateX(3px)}
.foot-ico{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:8px;background:rgba(255,255,255,.08);color:#FF9A5C}
.foot-ico svg{width:15px;height:15px}
.foot-logo{display:inline-block;background:#fff;border-radius:12px;padding:10px 14px}
.foot-logo .brand{display:block}
footer.site-footer .foot-brand p{margin:16px 0 0;max-width:290px;line-height:1.55}
.foot-badges{list-style:none;margin:18px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.foot-badges li{padding:5px 12px;border:1px solid rgba(255,255,255,.18);border-radius:999px;font-size:.8rem;color:#fff}
.foot-bar{border-top:1px solid rgba(255,255,255,.12)}
.foot-bar-in{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:20px}
.foot-bar p{margin:0;font-size:.88rem;color:#8e9cc6}
.to-top{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.08);color:#fff;border:1px solid rgba(255,255,255,.16);border-radius:999px;padding:9px 16px;font:600 .85rem var(--f-body);cursor:pointer;white-space:nowrap}
.to-top:hover{background:var(--accent);border-color:var(--accent)}
.to-top svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
@media (max-width:1000px){footer.site-footer .foot{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}footer.site-footer .foot-cta{flex-direction:column;align-items:flex-start;padding:26px}}
@media (max-width:560px){footer.site-footer .foot{grid-template-columns:1fr}.foot-bar-in{flex-direction:column;align-items:flex-start}}
/*footer3*/
footer.site-footer .foot-cta h2{text-transform:none;letter-spacing:-.01em;font-size:1.55rem;margin:0 0 6px}
footer.site-footer a.foot-cta-btn{display:inline-block;color:#0E1B3D;background:#fff;font-weight:700}
footer.site-footer a.foot-cta-btn:hover{color:#B8460A;transform:translateY(-2px)}
footer.site-footer .foot-brand p,footer.site-footer nav a{color:#c3cdea}
footer.site-footer nav a:hover{color:#fff}

/*footer4*/
footer.site-footer{margin-top:64px}
footer.site-footer .foot{padding-top:56px}
/*calc-modern*/
.calc-shell{--cp:clamp(20px,3.4vw,34px);position:relative;overflow:hidden;padding:var(--cp);border:1px solid #CBD6EE;border-radius:var(--r-lg);background:linear-gradient(180deg,#fff 0,#F6F9FE 100%);box-shadow:0 1px 2px rgba(14,27,61,.06),0 24px 50px -26px rgba(14,27,61,.38)}
.calc-shell::before{content:'Calculator';display:block;margin:calc(var(--cp)*-1) calc(var(--cp)*-1) var(--cp);padding:15px var(--cp) 15px calc(var(--cp) + 32px);background-color:var(--ink);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Crect x='5' y='2.5' width='14' height='19' rx='3' fill='none' stroke='%23fff' stroke-width='2'/%3E%3Cpath d='M8.5 7h7M8.5 12h.01M12 12h.01M15.5 12h.01M8.5 16h.01M12 16h.01M15.5 16h.01' stroke='%23F26A1B' stroke-width='2.4' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:left var(--cp) center;background-size:20px 20px;border-bottom:3px solid var(--accent);color:#fff;font:700 12.5px/1 var(--f-body);letter-spacing:.16em;text-transform:uppercase}
.calc-shell .calc-hint{display:flex;align-items:center;gap:10px;margin:0 0 6px;padding:11px 14px;border-radius:12px;background:#FFF4EC;border:1px solid #F8D5BC;color:var(--accent-ink);font-weight:600;font-size:14.5px;line-height:1.35}
.calc-shell .calc-hint::before{content:'i';flex:none;display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--accent);color:#fff;font:800 12px/1 var(--f-body)}
.calc-shell #basicCalculator{display:grid;grid-template-columns:minmax(0,1fr);gap:0}
.calc-shell #basicCalculator>label{align-self:auto;margin:18px 0 8px;font-size:12.5px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.calc-shell #basicCalculator>div{display:flex;flex-wrap:nowrap;align-items:stretch;overflow:hidden;border:1.5px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 1px 0 rgba(14,27,61,.04);transition:border-color .15s,box-shadow .15s}
.calc-shell #basicCalculator>div:hover{border-color:#B9C6E2}
.calc-shell #basicCalculator>div:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px rgba(242,106,27,.16)}
.calc-shell #basicCalculator>div>input{flex:1 1 auto;min-width:0;min-height:60px;padding:0 18px;border:0;border-radius:0;background:transparent;font:600 21px var(--f-body);color:var(--ink);box-shadow:none;outline:0}
.calc-shell #basicCalculator>div>input:focus{outline:0;border:0}
.calc-shell #basicCalculator>div>input::placeholder,.calc-shell #basicCalculator>input::placeholder{color:#9AA7C2;font-weight:500;font-size:17px}
.calc-shell #basicCalculator>div>select{flex:0 0 auto;width:auto;min-width:128px;max-width:50%;min-height:60px;padding:0 40px 0 16px;border:0;border-left:1.5px solid var(--line);border-radius:0;background-color:var(--tint);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' fill='none' stroke='%230E1B3D' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 15px center;background-size:12px 8px;font:600 15px var(--f-body);color:var(--ink);appearance:none;-webkit-appearance:none;cursor:pointer;text-overflow:ellipsis;outline:0}
.calc-shell #basicCalculator>div>select:hover{background-color:#DCE5F7}
.calc-shell #basicCalculator>div>select:focus{outline:0;background-color:#D3DEF4}
.calc-shell #basicCalculator>div>select:only-child{flex:1 1 100%;max-width:none;border-left:0;padding-left:18px}
.calc-shell #basicCalculator>input,.calc-shell #basicCalculator>select{min-height:60px;border:1.5px solid var(--line);border-radius:14px;font:600 20px var(--f-body)}
.calc-shell #basicCalculator input[type=number]{-moz-appearance:textfield;appearance:textfield}
.calc-shell #basicCalculator input[type=number]::-webkit-inner-spin-button,.calc-shell #basicCalculator input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
.calc-shell #basicCalculator>div:has(>input[readonly]){background:#FFF6EF;border-color:#F4C3A3}
.calc-shell #basicCalculator>div>input[readonly]{color:var(--accent-ink);font-weight:800}
.calc-shell .calc-actions{margin-top:28px;gap:12px}
.calc-shell .calc-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:0 30px;border-radius:14px;font:700 17px/1 var(--f-body);letter-spacing:.01em;transition:transform .12s,box-shadow .15s,background-color .15s,filter .15s}
.calc-shell .calc-btn::before{content:'';flex:none;width:20px;height:20px;background-repeat:no-repeat;background-position:center;background-size:contain}
.calc-shell .calc-btn--primary{flex:1 1 220px;background:linear-gradient(180deg,#FF8E45 0,#F26A1B 100%);color:var(--ink);box-shadow:inset 0 1px 0 rgba(255,255,255,.45),0 10px 22px -8px rgba(242,106,27,.75)}
.calc-shell .calc-btn--primary:hover{background:linear-gradient(180deg,#FF9B58 0,#F77527 100%);transform:translateY(-1px);box-shadow:inset 0 1px 0 rgba(255,255,255,.45),0 14px 26px -8px rgba(242,106,27,.85)}
.calc-shell .calc-btn--primary::before{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Crect x='5' y='2.5' width='14' height='19' rx='3' fill='none' stroke='%230E1B3D' stroke-width='2'/%3E%3Cpath d='M8.5 7h7M8.5 12h.01M12 12h.01M15.5 12h.01M8.5 16h.01M12 16h.01M15.5 16h.01' stroke='%230E1B3D' stroke-width='2.4' stroke-linecap='round'/%3E%3C/svg%3E")}
.calc-shell .calc-btn--ghost{flex:0 0 auto;background:#fff;border:1.5px solid var(--line);color:var(--ink)}
.calc-shell .calc-btn--ghost:hover{background:var(--tint);border-color:#B9C6E2}
.calc-shell .calc-btn--ghost::before{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M4 12a8 8 0 1 0 2.6-5.9M4 4v4.5h4.5' fill='none' stroke='%230E1B3D' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.calc-shell .calc-steps{margin-top:24px;padding:0 22px 20px;overflow:hidden;border:1px solid #CBD6EE;border-radius:14px;background:#fff;font-size:15.5px;line-height:1.8;box-shadow:0 10px 26px -18px rgba(14,27,61,.35)}
.calc-shell .calc-steps::before{content:'Step-by-step solution';display:block;margin:0 -22px 16px;padding:12px 22px;background:var(--tint);border-bottom:1px solid var(--line);color:var(--ink);font:700 12.5px/1 var(--f-body);letter-spacing:.1em;text-transform:uppercase}
.calc-shell .calc-steps strong{display:block;margin:2px 0 4px;font:800 1.12rem/1.3 var(--f-head);color:var(--ink)}
.calc-shell .calc-steps em{display:inline-block;margin:8px 0 2px;padding:2px 11px;border-radius:999px;background:#FFF0E4;color:var(--accent-ink);font-style:normal;font-weight:700;font-size:13.5px}
@media (max-width:560px){
 .calc-shell #basicCalculator>div{flex-wrap:wrap}
 .calc-shell #basicCalculator>div>select{flex:1 1 100%;max-width:none;border-left:0;border-top:1.5px solid var(--line);min-height:52px}
 .calc-shell .calc-btn--ghost{flex:1 1 auto}
}

.article .article-feat{margin:2em 0}.article .article-feat img{display:block;width:100%;height:auto;border-radius:18px;box-shadow:0 10px 30px rgba(15,23,42,.12)}