:root{
  --bg:#fbf7f2;
  --surface:#ffffff;
  --ink:#251b18;
  --muted:#7d7067;
  --line:#ece1d5;
  --accent:#ef5b3f;
  --accent-2:#2f6f9f;
  --accent-ink:#cf4126;
  --danger:#c24b4b;
  --display:"Fraunces",Georgia,"Times New Roman",serif;
  --sans:"Inter","Helvetica Neue",system-ui,sans-serif;
  --pad:clamp(18px,4vw,44px);
  --radius:16px;
  --shadow:0 16px 40px rgba(80,50,30,.08);
}
[data-theme="dark"]{
  --bg:#181310;
  --surface:#221c17;
  --ink:#f4ece2;
  --muted:#b2a393;
  --line:#3a2e25;
  --accent:#ff7a5c;
  --accent-2:#5a97c9;
  --accent-ink:#ffab90;
  --shadow:0 16px 40px rgba(0,0,0,.45);
}
*{box-sizing:border-box;margin:0}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-weight:400;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;height:auto}
h1,h2,h3,h4{font-family:var(--display);font-weight:600;line-height:1.08;margin:0 0 .4em;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,5.6vw,3.6rem)}
h2{font-size:1.9rem}
p{margin:0 0 1em}
a{color:var(--accent-ink);font-weight:600}
a:hover{text-decoration:none}
.wrap{max-width:1160px;margin:0 auto;padding:0 var(--pad)}
/* Header */
.site-head{position:sticky;top:0;z-index:50;background:var(--bg);border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;padding-top:13px;padding-bottom:13px}
.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}
.brand .logo{width:38px;height:38px;display:block;border-radius:6px}
.brand-name{font-family:var(--display);font-weight:700;font-size:1.5rem;letter-spacing:.01em}
.brand-name em{font-style:normal;color:var(--accent)}
.site-nav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.site-nav a{display:inline-block;padding:9px 15px;border-radius:999px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.93rem}
.site-nav a:hover{background:var(--surface);color:var(--accent-ink)}
.theme-toggle{min-width:44px;min-height:44px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);border-radius:11px;cursor:pointer;font-size:1.15rem;line-height:1}
/* Hero */
.tool-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:
  radial-gradient(52% 52% at 96% -6%,rgba(239,91,63,.14),transparent 62%),
  radial-gradient(42% 42% at -4% 26%,rgba(47,111,159,.10),transparent 60%)}
.tool-hero:before{content:"";position:absolute;inset:0;background:
  radial-gradient(circle at 30px 30px,rgba(80,50,30,.05) 2px,transparent 3px);background-size:60px 60px;-webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.5),transparent 85%);mask-image:linear-gradient(180deg,rgba(0,0,0,.5),transparent 85%);pointer-events:none}
.tool-hero>.wrap{position:relative;padding-top:38px}
.tool-hero .lede{color:var(--muted);font-size:1.05rem;max-width:740px}
.eyebrow{display:inline-block;font-weight:600;font-size:.76rem;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);margin-bottom:.55em}
/* Layout */
.calc-grid{position:relative;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:20px;align-items:start;padding-top:26px;padding-bottom:46px}
@media(max-width:880px){.calc-grid{grid-template-columns:1fr}}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
/* Segmented */
.seg{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:20px}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg label{display:flex;align-items:center;justify-content:center;min-height:50px;gap:7px;border:1.5px solid var(--line);border-radius:10px;background:var(--surface);cursor:pointer;font-weight:600;font-size:.88rem;transition:.15s;color:var(--ink)}
.seg input:checked+label{border-color:var(--accent);background:rgba(239,91,63,.09);color:var(--accent-ink)}
.seg label:hover{border-color:var(--accent)}
/* Inputs */
.field-label{display:block;font-weight:600;font-size:.84rem;margin-bottom:8px;color:var(--ink)}
.frac-input{display:grid;grid-template-columns:1fr;gap:10px;position:relative}
.frac-input input{width:100%;padding:16px;border:1.5px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font-family:var(--display),Georgia,serif;font-size:1.7rem;font-weight:600;text-align:center;line-height:1;resize:none;transition:.15s}
.frac-input input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(239,91,63,.16)}
.frac-bar{height:3px;background:var(--accent);border-radius:2px;width:56px;margin:0 auto}
.full-input{width:100%;padding:18px;border:1.5px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font-family:var(--display),Georgia,serif;font-size:1.9rem;font-weight:600;text-align:center;line-height:1;transition:.15s}
.full-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(239,91,63,.16)}
.hint{color:var(--muted);font-size:.82rem;margin:8px 0 0}
.precision-row{display:flex;align-items:center;gap:14px;margin-top:18px}
.precision-row .field-label{margin:0}
.precision-row select{padding:11px 14px;border:1.5px solid var(--line);border-radius:11px;background:var(--surface);color:var(--ink);font-family:var(--sans);font-weight:600;font-size:.95rem;cursor:pointer}
.precision-row select:focus{outline:none;border-color:var(--accent)}
.row-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.btn{min-height:47px;border:none;border-radius:11px;padding:0 20px;font-family:var(--sans);font-weight:600;font-size:.97rem;cursor:pointer;transition:.15s}
.btn.primary{background:linear-gradient(135deg,var(--accent),#d1421f);color:#fff;box-shadow:0 8px 20px rgba(239,91,63,.3)}
.btn.primary:hover{transform:translateY(-2px)}
.btn.ghost{background:var(--surface);border:1.5px solid var(--line);color:var(--ink)}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent-ink)}
/* Results */
.results-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}
.results-title h2{font-size:1.5rem;margin:0}
#badge{font-size:.74rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-ink);background:rgba(239,91,63,.09);border:1px solid rgba(239,91,63,.25);padding:5px 11px;border-radius:999px}
.result-holder{min-height:150px;display:flex;align-items:center;justify-content:center;text-align:center}
.placeholder{color:var(--muted);font-size:.95rem;max-width:260px}
.big-result{font-family:var(--display);font-weight:700;font-size:clamp(2.4rem,6vw,3.4rem);line-height:1;color:var(--ink);word-break:break-all}
.big-result small{font-family:var(--sans);font-size:.95rem;font-weight:600;color:var(--muted);display:block;margin-top:10px;word-break:normal}
.frac-result{display:inline-flex;flex-direction:column;align-items:center;line-height:1.15}
.frac-result .nu{font-family:var(--display);font-weight:700;font-size:clamp(2rem,5vw,2.9rem)}
.frac-result .bar{width:100%;height:3px;background:var(--ink);border-radius:2px;margin:2px 0}
.frac-result .de{font-family:var(--display);font-weight:700;font-size:clamp(2rem,5vw,2.9rem)}
/* Steps */
.steps-wrap{max-width:760px}
.steps{margin-top:8px;border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:6px 22px 20px;box-shadow:var(--shadow)}
.steps-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:18px 0 8px;flex-wrap:wrap}
.steps-head b{font-family:var(--display);font-size:1.05rem}
.steps-head span{color:var(--muted);font-size:.82rem;font-weight:600}
.steps-inline{color:var(--muted);font-size:.95rem}
.formula{background:var(--bg);border:1px dashed var(--line);border-radius:10px;padding:12px 15px;font-size:.98rem;color:var(--ink);overflow-x:auto}
.formula strong{color:var(--accent-ink)}
.cline{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px 15px;font-size:.95rem;color:var(--ink);margin-bottom:0}
.steps-note{color:var(--muted);font-size:.85rem;background:rgba(47,111,159,.07);border-left:3px solid var(--accent-2);padding:10px 14px;border-radius:0 8px 8px 0;margin-top:8px}
/* Content / articles */
.page{padding:44px 0 20px}
.page .wrap{max-width:760px}
.page-lede{color:var(--muted)}
.content-section{padding:30px 0 46px}
.content-section .inner{max-width:1160px;margin:0 auto;padding:0 var(--pad)}
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:26px}
@media(max-width:760px){.article-list{grid-template-columns:1fr}}
.article-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;text-decoration:none;color:var(--ink);transition:.18s;box-shadow:var(--shadow)}
.article-card:hover{border-color:var(--accent);transform:translateY(-3px)}
.article-card h2{font-size:1.3rem;margin-bottom:.4em}
.article-card p{color:var(--muted);font-size:.94rem;margin:0}
.article-body h2{margin-top:1.5em}
.article-body ul,.article-body ol{padding-left:0;list-style:none;margin:0 0 1em}
.article-body li{margin-bottom:.6em;padding-left:22px;position:relative}
.article-body ul li:before{content:"\25B6";position:absolute;left:0;top:0;font-size:.72em;color:var(--accent)}
.article-body ol{counter-reset:li}
.article-body ol li{counter-increment:li}
.article-body ol li:before{content:counter(li) ".";position:absolute;left:0;color:var(--accent);font-family:var(--display);font-weight:600}
.article-body code{background:var(--bg);border:1px solid var(--line);padding:1px 6px;border-radius:6px;font-size:.9em}
.quote{border-left:4px solid var(--accent);background:var(--surface);border-radius:0 12px 12px 0;padding:16px 20px;margin:1.4em 0;color:var(--muted)}
/* Footer */
.site-foot{border-top:1px solid var(--line);background:var(--surface)}
.foot-grid{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding-top:34px;padding-bottom:26px;flex-wrap:wrap}
.foot-brand{font-family:var(--display);font-weight:600;font-size:1.25rem;margin:0}
.site-foot nav ul{display:flex;gap:6px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.site-foot nav a{display:inline-block;padding:7px 11px;border-radius:999px;color:var(--muted);text-decoration:none;font-size:.9rem}
.site-foot nav a:hover{background:var(--bg);color:var(--accent-ink)}
.foot-legal{border-top:1px dashed var(--line);padding:16px var(--pad);color:var(--muted);font-size:.82rem;text-align:center}
/* Cookie banner */
.cookie-banner{position:fixed;left:16px;right:16px;bottom:16px;z-index:100;display:none;align-items:center;gap:14px;justify-content:space-between;flex-wrap:wrap;background:var(--ink);color:#fff;border-radius:14px;padding:14px 18px;box-shadow:var(--shadow);max-width:660px;margin:0 auto}
[data-theme="dark"] .cookie-banner{background:#0d0a07}
.cookie-banner p{margin:0;font-size:.9rem;flex:1;min-width:220px;color:#efe7dc}
.cookie-banner button{border:none;border-radius:10px;padding:9px 16px;font-family:var(--sans);font-weight:600;font-size:.9rem;cursor:pointer;min-height:40px}
#cookie-accept{background:var(--accent);color:#fff}
/* Responsive menu */
.menu-btn{display:none}
@media(max-width:640px){
  header:has(.menu-btn) .site-nav{position:relative}
  header:has(.menu-btn) .menu-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 16px;border:1.5px solid var(--line);background:var(--surface);border-radius:10px;font-family:var(--sans);font-weight:600;font-size:.9rem;cursor:pointer;color:var(--ink)}
  header:has(.menu-btn) #nav-menu{display:none;position:absolute;right:0;top:calc(100% + 8px);background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);min-width:200px;z-index:60;padding:8px}
  header:has(.menu-btn) #nav-menu.open{display:block}
  header:has(.menu-btn) .site-nav ul{flex-direction:column;gap:0}
  header:has(.menu-btn) .site-nav a{display:block;border-radius:10px}
}
@media(max-width:375px){body{font-size:.95rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* ===== CMS-generated article & archive pages ===== */
.site-header{position:sticky;top:0;z-index:50;background:var(--bg);border-bottom:1px solid var(--line)}
.site-header .inner{max-width:1160px;margin:0 auto;padding:13px var(--pad);display:flex;align-items:center;justify-content:space-between;gap:14px}
.site-header .logo{display:inline-flex;align-items:center;gap:11px;font-family:var(--display);font-weight:700;font-size:1.5rem;color:var(--ink);text-decoration:none}
.site-header .logo-img{width:38px;height:38px;border-radius:6px}
.nav-links{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.nav-links a{display:inline-block;padding:9px 15px;border-radius:999px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.93rem}
.nav-links a:hover{background:var(--surface);color:var(--accent-ink)}
@media(max-width:640px){.site-header .inner{flex-wrap:wrap}.nav-links{order:3;width:100%;justify-content:flex-start;flex-wrap:wrap}}
.article-content{padding:40px 0 30px}
.article-content .inner{max-width:760px;margin:0 auto;padding:0 var(--pad)}
.article-back{display:inline-block;font-size:.85rem;font-weight:600;color:var(--accent-ink);text-decoration:none;margin-bottom:18px}
.article-back:hover{text-decoration:underline}
.article-content article h1{font-size:clamp(1.8rem,4.5vw,2.6rem)}
.article-meta{display:flex;gap:12px;color:var(--muted);font-size:.85rem;margin:0 0 1.4em;flex-wrap:wrap}
.article-content article p{color:var(--ink);margin:0 0 1em}
.article-content article h2{margin-top:1.5em;font-size:1.5rem}
.article-content article ul,.article-content article ol{padding-left:0;list-style:none;margin:0 0 1em}
.article-content article li{margin-bottom:.6em;padding-left:22px;position:relative}
.article-content article ul li:before{content:"\25B6";position:absolute;left:0;top:0;font-size:.72em;color:var(--accent)}
.article-content article ol li{counter-increment:li;list-style:decimal}
.article-content article ol li::marker{color:var(--accent);font-family:var(--display);font-weight:600}
.article-content article blockquote,.article-content article .quote{border-left:4px solid var(--accent);background:var(--surface);border-radius:0 12px 12px 0;padding:16px 20px;margin:1.4em 0;color:var(--muted)}
.article-content article code{background:var(--bg);border:1px solid var(--line);padding:1px 6px;border-radius:6px;font-size:.9em}
.article-content table{border-collapse:collapse;width:100%;margin:1em 0}
.article-content th,.article-content td{border:1px solid var(--line);padding:8px 12px;font-size:.92rem}
.article-content th{background:var(--bg)}
/* FAQ */
.faq-section h2{font-size:1.5rem;margin-bottom:.6em}
.faq-section .faq{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:6px 20px 20px;box-shadow:var(--shadow);margin-top:8px}
.faq-section details{padding:14px 0;border-bottom:1px dashed var(--line)}
.faq-section details:last-child{border-bottom:none}
.faq-section summary{cursor:pointer;font-weight:600;font-family:var(--display);font-size:1.05rem;color:var(--ink)}
.faq-section details p{color:var(--muted);margin:10px 0 0;font-size:.95rem}
/* Archive list (CMS style: title + desc) */
.content-section{padding:40px 0 46px}
.content-section .inner{max-width:1160px;margin:0 auto;padding:0 var(--pad)}
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:26px}
@media(max-width:760px){.article-list{grid-template-columns:1fr}}
.article-list a{display:block;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;text-decoration:none;color:var(--ink);transition:.18s;box-shadow:var(--shadow)}
.article-list a:hover{border-color:var(--accent);transform:translateY(-3px)}
.article-title{font-family:var(--display);font-weight:600;font-size:1.3rem;line-height:1.2;margin-bottom:.4em}
.article-desc{color:var(--muted);font-size:.94rem}
/* Footer (CMS style) */
.site-footer{border-top:1px solid var(--line);background:var(--surface)}
.site-footer .inner{max-width:1160px;margin:0 auto;padding:30px var(--pad) 24px}
.footer-links{display:flex;gap:6px;flex-wrap:wrap}
.footer-links a{display:inline-block;padding:7px 11px;border-radius:999px;color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:500}
.footer-links a:hover{background:var(--bg);color:var(--accent-ink)}
.copyright{border-top:1px dashed var(--line);margin-top:20px;padding-top:16px;color:var(--muted);font-size:.82rem;text-align:center}