/*
Theme Name: CalcNesters Blog
Theme URI: https://calcnesters.com/blog/
Author: CalcNesters
Description: Dark, compact, tech-style blog theme for the CalcNesters calculator site. Changelog-style post index, mono metadata, glowing featured card, automatic table of contents, reading progress, and Article schema. Same brand hues as the calculators, inverted to dark.
Version: 3.0
Requires at least: 6.0
Tested up to: 6.8
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: calcnesters-blog
*/

/* ============================================================
   CALCNESTERS BLOG: dark tech theme
   Same brand hues as the calculator site, inverted to dark.
   Rubik for interface and headings, IBM Plex Mono for all
   metadata. Compact changelog-style index, glow accents.
   ============================================================ */
:root{
  --bg0:#071A22;
  --bg1:#0A222C;
  --card:#0D2933;
  --card2:#0F3140;
  --line:#173B49;
  --line2:#245468;
  --txt:#E8F2ED;
  --body:#C7D9D1;
  --dim:#93ACA3;
  --faint:#63807A;
  --jade:#1A936F;
  --mint:#2EE6A8;
  --spring:#88D498;
  --deep:#114B5F;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:"Rubik",system-ui,-apple-system,"Segoe UI",sans-serif;
  --rad:12px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);font-size:16px;line-height:1.65;color:var(--body);
  background:var(--bg0);
  background-image:radial-gradient(1100px 480px at 78% -8%,rgba(26,147,111,.16),transparent 62%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--mint);color:#04110C}
a{color:var(--spring);text-decoration:none}
a:hover{color:var(--mint)}
img{max-width:100%;height:auto;display:block}
:focus-visible{outline:2px solid var(--mint);outline-offset:2px;border-radius:3px}
::-webkit-scrollbar{width:11px}
::-webkit-scrollbar-track{background:var(--bg0)}
::-webkit-scrollbar-thumb{background:var(--line);border-radius:6px}
::-webkit-scrollbar-thumb:hover{background:var(--line2)}

.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
.wrap-narrow{max-width:860px;margin:0 auto;padding:0 22px}
.mono{font-family:var(--mono)}
.mint{color:var(--mint)}

/* --- Top bar --- */
.top{position:sticky;top:0;z-index:50;background:rgba(7,26,34,.82);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--sans);font-weight:800;font-size:1.05rem;letter-spacing:-.01em;color:var(--txt)}
.brand:hover{color:var(--txt);text-decoration:none}
.brand img{width:28px;height:28px;border-radius:7px}
.brand .b2{color:var(--spring)}
.top-nav{display:flex;gap:4px;flex-wrap:wrap}
.top-nav a{font-family:var(--mono);font-size:.76rem;color:var(--dim);padding:7px 10px;border-radius:7px}
.top-nav a:hover{color:var(--mint);background:var(--bg1);text-decoration:none}
.top-nav a.on{color:var(--mint)}
@media (max-width:820px){.top-nav a:nth-child(-n+4){display:none}}

/* --- Blog head --- */
.bhead{padding:44px 0 10px}
.crumb{font-family:var(--mono);font-size:.8rem;color:var(--faint)}
.crumb .mint{color:var(--mint)}
.bhead h1{font-family:var(--sans);font-weight:800;font-size:clamp(1.9rem,4.4vw,2.75rem);letter-spacing:-.03em;line-height:1.05;color:var(--txt);margin:10px 0 10px}
.bhead .sub{color:var(--dim);font-size:.98rem;max-width:56ch}
.chiprow{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0 4px}
.chip{font-family:var(--mono);font-size:.74rem;color:var(--dim);border:1px solid var(--line);border-radius:999px;padding:5px 12px;background:transparent}
.chip:hover{color:var(--mint);border-color:var(--line2);text-decoration:none}
.chip.on{color:#04110C;background:var(--mint);border-color:var(--mint)}

/* --- Featured post --- */
.feat{position:relative;display:block;margin:26px 0 8px;border:1px solid var(--line);border-radius:16px;padding:30px 32px;background:linear-gradient(160deg,var(--card),var(--bg1));overflow:hidden;transition:border-color .18s ease,transform .18s ease}
.feat::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:34px 34px;opacity:.28;mask-image:radial-gradient(420px 220px at 85% 0%,#000,transparent 75%);-webkit-mask-image:radial-gradient(420px 220px at 85% 0%,#000,transparent 75%)}
.feat::after{content:"";position:absolute;inset:0;background:radial-gradient(460px 220px at 88% -6%,rgba(46,230,168,.18),transparent 70%)}
.feat>*{position:relative;z-index:1}
.feat:hover{border-color:var(--line2);transform:translateY(-2px);text-decoration:none}
.f-eyebrow{font-family:var(--mono);font-size:.74rem;color:var(--mint);letter-spacing:.02em}
.feat h2{font-family:var(--sans);font-weight:800;font-size:clamp(1.45rem,3vw,2.05rem);letter-spacing:-.022em;line-height:1.15;color:var(--txt);margin:10px 0 10px}
.feat:hover h2{color:var(--mint)}
.feat .deck{color:var(--dim);font-size:.98rem;max-width:64ch;margin-bottom:16px}
.f-meta{font-family:var(--mono);font-size:.76rem;color:var(--faint);display:flex;gap:16px;flex-wrap:wrap}

/* --- Post list (changelog rows) --- */
.sec{font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;color:var(--faint);text-transform:lowercase;margin:34px 0 0;padding-bottom:10px;border-bottom:1px solid var(--line)}
.plist{list-style:none}
.prow{display:grid;grid-template-columns:96px minmax(0,1fr) auto;gap:20px;align-items:baseline;padding:17px 6px;border-bottom:1px solid var(--line);transition:background .15s ease}
.prow:hover{background:var(--bg1)}
.p-date{font-family:var(--mono);font-size:.76rem;color:var(--faint);white-space:nowrap}
.prow h3{font-family:var(--sans);font-weight:600;font-size:1.04rem;letter-spacing:-.012em;line-height:1.35}
.prow h3 a{color:var(--txt)}
.prow h3 a:hover{color:var(--mint);text-decoration:none}
.p-tags{font-family:var(--mono);font-size:.72rem;color:var(--faint);margin-top:3px}
.p-tags a{color:var(--faint)}
.p-tags a:hover{color:var(--mint)}
.p-right{font-family:var(--mono);font-size:.76rem;color:var(--faint);white-space:nowrap}
.prow .arr{display:inline-block;transition:transform .15s ease;color:var(--mint);opacity:0}
.prow:hover .arr{opacity:1;transform:translateX(3px)}
@media (max-width:640px){
  .prow{grid-template-columns:minmax(0,1fr) auto;gap:10px}
  .p-date{grid-column:1 / -1;order:-1}
}

/* --- Article layout --- */
.art-grid{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:52px;align-items:start;padding:10px 0 60px}
.art-rail{position:sticky;top:84px;display:flex;flex-direction:column;gap:24px}
@media (max-width:1023px){.art-grid{grid-template-columns:1fr;gap:30px}.art-rail{position:static}}

.art-head{padding:40px 0 0}
.art-head .crumb{display:block;margin-bottom:14px}
.art-head h1{font-family:var(--sans);font-weight:800;font-size:clamp(1.85rem,4.4vw,2.7rem);letter-spacing:-.028em;line-height:1.08;color:var(--txt);margin:0 0 14px;max-width:24ch}
.art-head .deck{color:var(--dim);font-size:1.06rem;line-height:1.6;max-width:58ch;margin-bottom:20px}
.byline{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 2px;margin-bottom:28px;font-family:var(--mono);font-size:.78rem;color:var(--faint)}
.byline .who{display:flex;align-items:center;gap:10px}
.avatar{width:30px;height:30px;border-radius:8px;background:linear-gradient(140deg,var(--jade),var(--deep));color:#fff;display:grid;place-items:center;font-family:var(--mono);font-size:.72rem}
.byline .who b{color:var(--body);font-weight:600}

.entry-content{font-size:1.03rem;line-height:1.78;max-width:68ch;counter-reset:sec}
.entry-content p{margin:0 0 18px;color:var(--body)}
.entry-content h2{counter-increment:sec;font-family:var(--sans);font-weight:700;font-size:1.4rem;letter-spacing:-.018em;color:var(--txt);margin:38px 0 12px;scroll-margin-top:86px}
.entry-content h2::before{content:counter(sec,decimal-leading-zero);font-family:var(--mono);font-size:.8rem;color:var(--mint);margin-right:12px;vertical-align:2px}
.entry-content h3{font-family:var(--sans);font-weight:600;font-size:1.08rem;color:var(--txt);margin:28px 0 8px}
.entry-content a{color:var(--spring);text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(136,212,152,.4)}
.entry-content a:hover{color:var(--mint);text-decoration-color:var(--mint)}
.entry-content strong{color:var(--txt);font-weight:600}
.entry-content ul,.entry-content ol{margin:0 0 18px;padding-left:22px}
.entry-content li{margin-bottom:8px}
.entry-content li::marker{color:var(--jade)}
.entry-content img{border-radius:10px;border:1px solid var(--line)}
.entry-content figure{margin:24px 0}
.entry-content figcaption{font-family:var(--mono);font-size:.74rem;color:var(--faint);margin-top:8px}
.entry-content blockquote{margin:26px 0;padding:14px 20px;border-left:2px solid var(--mint);background:var(--bg1);border-radius:0 10px 10px 0;color:var(--txt)}
.entry-content blockquote p{margin:0;color:var(--txt)}
.entry-content hr{border:0;border-top:1px solid var(--line);margin:32px 0}
.entry-content code{font-family:var(--mono);font-size:.88em;color:var(--spring);background:var(--bg1);border:1px solid var(--line);padding:2px 7px;border-radius:6px}
.entry-content pre{background:#051318;border:1px solid var(--line);border-radius:10px;padding:16px 18px;overflow-x:auto;margin:0 0 20px;font-size:.86rem;line-height:1.6}
.entry-content pre code{background:none;border:0;padding:0;color:var(--body)}
.entry-content table{width:100%;border-collapse:collapse;font-size:.92rem;margin:0 0 22px}
.entry-content th{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);text-align:left;padding:9px 12px;border-bottom:1px solid var(--line2)}
.entry-content td{padding:10px 12px;border-bottom:1px solid var(--line);color:var(--body)}
.entry-content tr:hover td{background:var(--bg1)}

/* --- Key figure --- */
.figure-note{display:flex;gap:20px;align-items:baseline;flex-wrap:wrap;margin:28px 0;padding:16px 20px;background:var(--bg1);border:1px solid var(--line);border-left:2px solid var(--mint);border-radius:0 10px 10px 0}
.figure-note .fn-num{font-family:var(--mono);font-weight:600;font-size:2rem;color:var(--mint);line-height:1;font-variant-numeric:tabular-nums}
.figure-note .fn-txt{font-size:.9rem;color:var(--dim);flex:1;min-width:200px;line-height:1.55}

/* --- Calculator CTA --- */
.calc-cta{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:30px 0;padding:22px 24px;background:linear-gradient(150deg,var(--card2),var(--card));border:1px solid var(--line2);border-radius:14px;position:relative;overflow:hidden}
.calc-cta::before{content:"";position:absolute;inset:0;background:radial-gradient(320px 140px at 92% 0%,rgba(46,230,168,.14),transparent 70%)}
.calc-cta>*{position:relative}
.calc-cta .cc-l{flex:1;min-width:230px}
.calc-cta .cc-k{font-family:var(--mono);font-size:.72rem;color:var(--mint);display:block;margin-bottom:6px}
.calc-cta strong{display:block;font-family:var(--sans);font-weight:700;font-size:1.18rem;color:var(--txt);letter-spacing:-.015em;margin-bottom:4px}
.calc-cta p{margin:0;font-size:.88rem;color:var(--dim)}
.cc-btn{font-family:var(--sans);font-weight:700;font-size:.9rem;color:#04110C;background:var(--mint);padding:12px 20px;border-radius:9px;white-space:nowrap}
.cc-btn:hover{background:var(--spring);color:#04110C;text-decoration:none}

/* --- Progress + TOC --- */
.progress{position:fixed;top:0;left:0;height:2px;width:0;background:linear-gradient(90deg,var(--jade),var(--mint));z-index:99}
.toc{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:var(--card)}
.toc h3{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin:0 0 10px}
.toc ol{list-style:none;counter-reset:toc}
.toc li{counter-increment:toc}
.toc a{display:flex;gap:9px;padding:6px 0;font-size:.82rem;line-height:1.4;color:var(--dim);border-left:2px solid transparent;padding-left:10px;margin-left:-11px}
.toc a::before{content:counter(toc,decimal-leading-zero);font-family:var(--mono);font-size:.7rem;color:var(--jade);padding-top:2px}
.toc a:hover{color:var(--mint);text-decoration:none}
.toc a.on{color:var(--txt);border-left-color:var(--mint)}
.toc a.on::before{color:var(--mint)}

/* --- Rail widgets --- */
.rail-box{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:var(--card)}
.rail-box h3,.rail-box .widget-title{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin:0 0 10px;font-weight:500}
.rail-box ul{list-style:none}
.rail-box li{border-top:1px solid var(--line)}
.rail-box li:first-child{border-top:0}
.rail-box li a{display:block;padding:8px 0;font-size:.85rem;color:var(--dim)}
.rail-box li a:hover{color:var(--mint);text-decoration:none}
.rail-note{font-size:.8rem;color:var(--faint);line-height:1.6}

/* --- Ads --- */
.ad-slot{margin:26px 0;text-align:center}
.ad-label{display:block;font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:7px}
.ad-box{border:1px dashed var(--line2);border-radius:10px;min-height:100px;display:grid;place-items:center;font-family:var(--mono);font-size:.76rem;color:var(--faint);background:rgba(13,41,51,.4);padding:14px}
.ad-box.tall{min-height:520px}
.ad-box.rect{min-height:250px}

/* --- Search --- */
.search-form{display:flex;gap:8px}
.search-form input[type=search]{flex:1;min-width:0;background:var(--bg1);border:1px solid var(--line);border-radius:9px;padding:10px 12px;color:var(--txt);font-family:var(--sans);font-size:.9rem}
.search-form input[type=search]::placeholder{color:var(--faint)}
.search-form input[type=search]:focus{border-color:var(--jade);outline:none}
.search-form button{font-family:var(--mono);font-size:.74rem;color:#04110C;background:var(--mint);border:0;border-radius:9px;padding:10px 15px;cursor:pointer}
.search-form button:hover{background:var(--spring)}

/* --- Pagination --- */
.pagination{display:flex;gap:7px;flex-wrap:wrap;margin:30px 0 10px;font-family:var(--mono);font-size:.8rem}
.pagination .page-numbers{padding:8px 13px;border:1px solid var(--line);border-radius:8px;color:var(--dim)}
.pagination a.page-numbers:hover{border-color:var(--line2);color:var(--mint);text-decoration:none}
.pagination .page-numbers.current{background:var(--mint);border-color:var(--mint);color:#04110C}

/* --- Post nav + related --- */
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:38px}
.post-nav .pn{display:block;border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:var(--card)}
.post-nav .pn:hover{border-color:var(--line2);text-decoration:none}
.post-nav .pn span{display:block;font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin-bottom:6px}
.post-nav .pn i{font-style:normal;font-size:.92rem;font-weight:600;color:var(--txt);line-height:1.35}
.post-nav .pn:hover i{color:var(--mint)}
.post-nav .nx{text-align:right}
@media (max-width:640px){.post-nav{grid-template-columns:1fr}.post-nav .nx{text-align:left}}

.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:14px}
.rel-item{border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:var(--card);display:block}
.rel-item:hover{border-color:var(--line2);text-decoration:none}
.rel-item .rd{font-family:var(--mono);font-size:.7rem;color:var(--faint)}
.rel-item h4{font-size:.92rem;font-weight:600;color:var(--txt);line-height:1.35;margin-top:6px;letter-spacing:-.01em}
.rel-item:hover h4{color:var(--mint)}
@media (max-width:767px){.rel-grid{grid-template-columns:1fr}}

/* --- Comments --- */
.comments{margin-top:42px;border-top:1px solid var(--line);padding-top:20px}
.comments h2,.comments h3{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin-bottom:14px;font-weight:500}
.comment-list{list-style:none;margin-bottom:24px}
.comment-list li{border-bottom:1px solid var(--line);padding:14px 0;font-size:.94rem}
.comment-form input[type=text],.comment-form input[type=email],.comment-form input[type=url],.comment-form textarea{width:100%;background:var(--bg1);border:1px solid var(--line);border-radius:9px;padding:11px 13px;color:var(--txt);font-family:var(--sans);font-size:.92rem;margin-bottom:10px}
.comment-form textarea{min-height:120px}
.comment-form input:focus,.comment-form textarea:focus{border-color:var(--jade);outline:none}
.comment-form .submit{font-family:var(--sans);font-weight:700;color:#04110C;background:var(--mint);border:0;border-radius:9px;padding:11px 22px;cursor:pointer;font-size:.9rem}
.comment-form .submit:hover{background:var(--spring)}

/* --- 404 / empty --- */
.notfound{padding:70px 0;max-width:60ch}
.notfound h1{font-family:var(--sans);font-weight:800;font-size:2.2rem;letter-spacing:-.025em;color:var(--txt);margin:10px 0 12px}
.notfound p{color:var(--dim);margin-bottom:10px}

/* --- Footer --- */
.site-footer{margin-top:70px;background:#04141B;border-top:1px solid var(--line)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px;padding:44px 22px 30px;max-width:1120px;margin:0 auto}
.site-footer p{color:var(--faint);font-size:.88rem;line-height:1.65;margin-top:12px;max-width:40ch}
.site-footer h4{font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);margin-bottom:12px;font-weight:500}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:8px}
.site-footer li a{color:var(--faint);font-size:.88rem}
.site-footer li a:hover{color:var(--mint);text-decoration:none}
.footer-bottom{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;border-top:1px solid var(--line);padding:16px 22px 26px;max-width:1120px;margin:0 auto;font-family:var(--mono);font-size:.72rem;color:var(--faint)}
@media (max-width:767px){.footer-grid{grid-template-columns:1fr;gap:26px}}

/* --- A11y + print --- */
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:12px;z-index:200;background:var(--mint);color:#04110C;padding:10px 16px;border-radius:8px}
.screen-reader-text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(1px,1px,1px,1px)}
@media print{.top,.art-rail,.ad-slot,.post-nav,.comments,.site-footer,.progress{display:none}body{background:#fff;color:#000}.entry-content{max-width:none;color:#000}.entry-content p{color:#000}}