/*
Theme Name: CellLingo
Theme URI: https://celllingo.online/
Author: CellLingo
Author URI: https://celllingo.online/
Description: Original fast WordPress theme for CellLingo.online spreadsheet tools, function guides and educational content.
Version: 2.3.0
Requires at least: 6.0
Requires PHP: 7.4
Text Domain: celllingo
*/
:root{--ink:#142033;--muted:#657289;--line:#e1e7ef;--bg:#f7f9fc;--card:#fff;--brand:#5b4cf0;--accent:#16a3a0;--navy:#10182c;--max:1200px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}a{color:#4e46cc;text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}.site-shell{width:min(var(--max),calc(100% - 36px));margin:auto}.site-main{min-height:70vh}
.utility-bar{background:#0f1730;color:#c9d3e5;font-size:.78rem}.utility-row{min-height:32px;display:flex;align-items:center;justify-content:space-between;gap:18px}.utility-row a{color:#e5e9f2}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(13px);border-bottom:1px solid rgba(220,227,237,.94)}.header-row{min-height:74px;display:flex;align-items:center;gap:25px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:1.2rem;font-weight:900;letter-spacing:-.035em}.brand:hover{text-decoration:none}.brand-mark{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--brand),var(--accent));font-size:.8rem}.brand-domain{font-size:.72rem;color:#7c8798;font-weight:650;margin-left:2px}.nav-main{margin-left:auto}.nav-main ul{list-style:none;display:flex;align-items:center;gap:17px;margin:0;padding:0}.nav-main a{font-size:.9rem;font-weight:730;color:#364257}.header-cta{background:var(--navy);color:#fff!important;padding:9px 13px;border-radius:10px;font-weight:780}.menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 10px}
.home-hero{padding:66px 0 32px;background:radial-gradient(circle at 5% 5%,#eae7ff 0,transparent 31%),radial-gradient(circle at 90% 15%,#daf9f6 0,transparent 28%)}.hero-copy{max-width:920px;margin:0 auto 30px;text-align:center}.hero-copy .eyebrow{display:inline-flex;gap:7px;align-items:center;background:#edeaff;color:#493bc9;border-radius:999px;padding:7px 12px;font-size:.76rem;font-weight:850;letter-spacing:.05em}.hero-copy h1{font-size:clamp(2.8rem,7vw,5.8rem);line-height:.95;letter-spacing:-.06em;margin:18px 0}.hero-copy p{font-size:1.12rem;color:#5b687e;max-width:740px;margin:auto}.hero-trust{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-top:18px;font-size:.83rem;color:#667388}.hero-trust span:before{content:"✓";color:#0b8f71;font-weight:900;margin-right:5px}
.content-wrap{padding:44px 0 72px}.page-card,.post-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:clamp(22px,4vw,46px);box-shadow:0 12px 38px rgba(28,42,74,.055)}.page-card>h1,.entry-title{font-size:clamp(2.2rem,5vw,3.7rem);line-height:1.04;letter-spacing:-.045em}.entry-content{font-size:1.01rem}.entry-content h2{font-size:1.65rem;line-height:1.18;margin-top:2rem}.entry-content h3{font-size:1.25rem;margin-top:1.5rem}.entry-content p,.entry-content li{color:#424f64}.entry-content code{background:#f0f2f7;border-radius:5px;padding:2px 5px}.entry-content pre code{background:none;padding:0}.breadcrumb{font-size:.82rem;color:#8490a2;margin-bottom:18px}.breadcrumb a{color:#68758a}
.posts-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:20px}.posts-head h1{font-size:2.65rem;line-height:1.05;letter-spacing:-.04em;margin:.3rem 0}.posts-head p{color:#6b778a}.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.post-teaser{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;display:flex;flex-direction:column;min-height:245px}.post-teaser .meta,.single-meta{font-size:.77rem;text-transform:uppercase;letter-spacing:.07em;color:#7c8798}.post-teaser h2{font-size:1.25rem;line-height:1.2}.post-teaser h2 a{color:var(--ink)}.post-teaser p{color:#667388}.post-teaser .read{margin-top:auto;font-weight:750}.single-meta{text-transform:none;letter-spacing:0;margin-bottom:10px}.article-lede{font-size:1.08rem;color:#5b687c}.article-nav{border-top:1px solid var(--line);margin-top:32px;padding-top:20px;display:flex;justify-content:space-between;gap:20px}.ad-slot{margin:24px 0}.ad-slot:empty{display:none}
.site-footer{margin-top:70px;background:var(--navy);color:#c6d0e1}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;padding:52px 0}.site-footer h3,.site-footer h4{color:#fff;margin-top:0}.site-footer p{max-width:440px}.site-footer a{color:#ced6e7}.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:7px}.footer-domain{display:inline-flex;background:#1d2843;color:#e8edf8;border-radius:999px;padding:6px 10px;font-size:.75rem;margin-top:8px}.footer-bottom{border-top:1px solid #25314b;padding:18px 0;display:flex;justify-content:space-between;gap:15px;color:#93a0b7;font-size:.82rem}.pagination{margin-top:26px}.nav-links{display:flex;gap:8px;flex-wrap:wrap}.page-numbers{background:#fff;border:1px solid var(--line);border-radius:8px;padding:7px 11px}.page-numbers.current{background:var(--brand);color:#fff}.not-found{text-align:center;padding:80px 0}.not-found h1{font-size:5rem;margin:0}.search-form{display:flex;gap:8px}.search-form input{min-width:220px;padding:10px 12px;border:1px solid var(--line);border-radius:10px}.search-form button{border:0;background:var(--navy);color:#fff;border-radius:10px;padding:10px 14px}.screen-reader-text{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:930px){.nav-main{display:none;position:absolute;top:74px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:16px 22px}.nav-main.open{display:block}.nav-main ul{flex-direction:column;align-items:flex-start}.menu-toggle{display:block}.header-cta{display:none}.post-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.utility-row span:last-child{display:none}}
@media(max-width:620px){.site-shell{width:min(var(--max),calc(100% - 24px))}.home-hero{padding-top:44px}.header-row{min-height:64px}.nav-main{top:64px}.post-grid,.footer-grid{grid-template-columns:1fr}.footer-bottom,.posts-head,.article-nav{flex-direction:column}.page-card,.post-card{border-radius:17px}.brand-domain{display:none}}

/* v2.3 trust, editorial and reference improvements */
.trust-panel{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:28px 0 8px}.trust-panel>div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.trust-panel strong{display:block;font-size:1rem;color:var(--ink);margin-bottom:4px}.trust-panel span{font-size:.88rem;color:var(--muted)}
.author-box{display:flex;gap:16px;align-items:flex-start;margin-top:34px;padding:20px;border:1px solid var(--line);border-radius:16px;background:#f8faff}.author-avatar{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;font-weight:900;flex:0 0 auto}.author-box h3{margin:0 0 4px;font-size:1rem}.author-box p{margin:0;color:#637086;font-size:.9rem}.content-note{border-left:4px solid var(--accent);background:#f2fbfa;padding:14px 16px;border-radius:0 12px 12px 0;margin:22px 0;color:#405167}.page-updated{font-size:.8rem;color:#7b8799;margin:-8px 0 24px}.site-footer .footer-note{font-size:.8rem;color:#94a2b8;margin-top:12px}.seo-intro{max-width:850px;margin:18px auto 0;color:#5d6b80;text-align:center}.mini-link-row{display:flex;gap:9px;flex-wrap:wrap;margin-top:13px}.mini-link-row a{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 11px;font-size:.82rem;font-weight:700}
@media(max-width:760px){.trust-panel{grid-template-columns:1fr}.author-box{flex-direction:column}}