/*
Theme Name: Auto Fluid Oils – Grade First
Theme URI: https://autofluidoils.com
Author: Eng. Kamrul Islam
Description: Lightweight, fast, SEO-focused theme for Auto Fluid Oils. Grade-aware internal linking, colour-coded fluid categories, breadcrumbs with structured data. No frameworks, no external requests.
Version: 1.1.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: afo
Tags: blog, custom-logo, custom-menu, featured-images, threaded-comments
*/

/* ---------- tokens ---------- */
:root{
  --ink:#17212b;
  --steel:#56626d;
  --line:#e1e5e9;
  --soft:#f4f6f7;
  --paper:#fff;
  --oil:#e39a10;
  --oil-d:#a86a00;
  --oil-l:#fff3dc;
  --link:#0d5f6b;
  --max:1160px;
  --c:#b86b00;
  --f-h:"Barlow Semi Condensed","Arial Narrow",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-g:"Barlow Condensed","Arial Narrow",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-b:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-b);font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,h5{font-family:var(--f-h);font-weight:700;line-height:1.14;margin:0 0 .45em}
.w{width:min(calc(100% - 40px),var(--max));margin-inline:auto}
.screen-reader-text{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}
.skip-link:focus{position:fixed!important;top:10px;left:10px;width:auto;height:auto;clip:auto;z-index:99999;background:var(--ink);color:#fff;padding:12px 18px;border-radius:8px;font-weight:700}
:focus-visible{outline:3px solid #2f7bf6;outline-offset:2px}

/* ---------- header ---------- */
.hd{border-bottom:1px solid var(--line);background:var(--paper)}
.hd-in{display:flex;align-items:center;gap:26px;padding:16px 0}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--f-h);font-weight:700;font-size:25px;line-height:1;white-space:nowrap}
.logo img{width:38px;height:38px}
.logo small{display:block;font-family:var(--f-b);font-weight:500;font-size:12px;color:var(--steel);margin-top:3px;white-space:normal}
.hd-search{flex:1;max-width:520px;margin-left:auto}
.hd-search form{display:flex;align-items:center;gap:10px;background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:6px 14px}
.hd-search input{border:0;background:transparent;font:inherit;font-size:15px;color:var(--ink);width:100%;padding:4px 0}
.hd-search input:focus{outline:0}
.hd-search button{border:0;background:transparent;color:var(--steel);cursor:pointer;padding:0;display:grid;place-items:center}
.nav{background:var(--ink)}
.nav-in{display:flex;overflow-x:auto;scrollbar-width:none}
.nav-in::-webkit-scrollbar{display:none}
.nav a{color:#dfe5ea;font-family:var(--f-h);font-weight:600;font-size:16.5px;padding:11px 16px;white-space:nowrap;border-bottom:3px solid transparent}
.nav a:hover,.nav .current-cat>a,.nav .current-menu-item>a{color:#fff;border-bottom-color:var(--c,var(--oil))}
.nav ul{list-style:none;display:flex;margin:0;padding:0}

/* ---------- hero + grade decoder ---------- */
.hero{border-bottom:1px solid var(--line)}
.hero-in{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:48px;align-items:center;padding:52px 0}
.hero h1{font-size:clamp(38px,5vw,60px);margin-bottom:14px}
.hero .sub{font-size:19px;color:var(--steel);margin:0 0 22px;max-width:44ch}
.trust{display:flex;flex-wrap:wrap;gap:8px 22px;font-size:14.5px;color:var(--steel)}
.trust span{display:flex;align-items:center;gap:7px}
.trust i{width:8px;height:8px;border-radius:50%;background:var(--oil)}
.dec{background:var(--ink);color:#fff;border-radius:16px;padding:22px 24px 24px}
.dec-top{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.dec-top b{font-family:var(--f-h);font-size:18px;font-weight:600}
.dec-pick{display:flex;gap:6px;flex-wrap:wrap}
.dec-pick button{background:transparent;border:1px solid #3b4753;color:#cfd7de;border-radius:8px;padding:4px 11px;font-family:var(--f-g);font-weight:600;font-size:16px;cursor:pointer}
.dec-pick button[aria-pressed="true"]{background:var(--oil);border-color:var(--oil);color:var(--ink)}
.dec-grade{display:flex;align-items:flex-start;gap:6px;margin:22px 0 10px}
.dec-part{display:flex;flex-direction:column}
.dec-part span{font-family:var(--f-g);font-weight:700;font-size:clamp(58px,9vw,112px);line-height:.9;color:#fff}
.dec-part:first-child span{color:var(--oil)}
.dec-part em{font-style:normal;font-size:13.5px;color:#aeb9c3;border-top:2px solid currentColor;margin-top:8px;padding-top:6px;max-width:170px;line-height:1.35}
.dec-part:first-child em{color:#f0c46b}
.dec-dash{font-family:var(--f-g);font-weight:700;font-size:clamp(58px,9vw,112px);line-height:.9;color:#56636f}
.dec p{margin:14px 0 16px;color:#d6dde3;font-size:15.5px;line-height:1.6}
.dec .go{display:inline-block;background:#fff;color:var(--ink);font-weight:700;font-size:15px;border-radius:8px;padding:8px 14px}

/* ---------- bands & headings ---------- */
.band{padding:48px 0}
.band.soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.h2row{display:flex;justify-content:space-between;align-items:baseline;gap:14px;margin-bottom:20px;flex-wrap:wrap}
.h2row h2{font-size:32px;margin:0}
.h2row a{color:var(--link);font-weight:600;font-size:15.5px}

/* ---------- category tiles ---------- */
.mach{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.m{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:18px 20px 20px;position:relative;overflow:hidden}
.m::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--c)}
.m h3{font-size:22px;margin:0 0 4px}
.m h3 a:hover{color:var(--link)}
.m .n{font-size:14px;color:var(--steel)}
.m .tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.m .tags a{font-family:var(--f-g);font-weight:600;font-size:15px;color:var(--c);background:color-mix(in srgb,var(--c) 10%,#fff);border-radius:6px;padding:2px 9px}
.m .tags a:hover{background:color-mix(in srgb,var(--c) 18%,#fff)}

/* ---------- answers + method ---------- */
.two{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:44px}
.ans a{display:grid;grid-template-columns:128px minmax(0,1fr);gap:14px;padding:14px 0;border-bottom:1px solid var(--line);align-items:baseline}
.ans a:first-child{border-top:1px solid var(--line)}
.gtag{font-family:var(--f-g);font-weight:700;font-size:17px;color:var(--c)}
.ans b{font-family:var(--f-h);font-size:20px;font-weight:600;line-height:1.25}
.ans a:hover b{color:var(--link)}
.how{background:var(--oil-l);border-radius:14px;padding:24px 26px}
.how h3{font-size:24px}
.how ol{margin:0 0 14px;padding-left:20px}
.how li{margin-bottom:6px}
.how a{color:var(--oil-d);font-weight:700;font-size:15.5px}

/* ---------- cards ---------- */
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.card{display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.card .th{position:relative;aspect-ratio:16/9;background:color-mix(in srgb,var(--c) 12%,#fff);display:grid;place-items:center;overflow:hidden}
.card .th img{width:100%;height:100%;object-fit:cover}
.card .th .ph{width:20%;color:var(--c)}
.card .th .gt{position:absolute;left:12px;bottom:10px;background:#fff;border-radius:6px;padding:1px 9px;font-family:var(--f-g);font-weight:700;font-size:16px;color:var(--c)}
.card .cb{padding:14px 18px 18px}
.card .k{font-size:13.5px;font-weight:600;color:var(--c)}
.card h3{font-size:21px;margin:3px 0 6px;font-weight:600;line-height:1.2}
.card p{margin:0;color:var(--steel);font-size:15px;line-height:1.55}
.card:hover h3{color:var(--link)}

/* ---------- breadcrumbs ---------- */
.cr{font-size:14px;color:var(--steel);padding:18px 0 0}
.cr a:hover{color:var(--link)}
.cr .sep{margin:0 7px;color:#aab3bb}

/* ---------- footer ---------- */
.ft{background:var(--ink);color:#c3ccd4;font-size:15px;margin-top:0}
.ft-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:34px;padding:48px 0 32px}
.ft h5{font-family:var(--f-h);font-size:17px;color:#fff;margin:0 0 10px;font-weight:600}
.ft .fl{font-family:var(--f-h);font-weight:700;font-size:24px;color:#fff;display:flex;align-items:center;gap:10px;margin-bottom:10px}
.ft .fl img{width:34px;height:34px}
.ft p{margin:0 0 14px;font-size:14.5px}
.ft ul{list-style:none;margin:0;padding:0;line-height:2.05}
.ft ul a:hover{color:#fff}
.soc{display:flex;gap:8px}
.soc a{width:36px;height:36px;border-radius:50%;border:1px solid #3a4652;display:grid;place-items:center;color:#fff}
.soc svg{width:17px;height:17px}
.nl{display:flex;gap:6px;flex-wrap:wrap}
.nl input{flex:1;min-width:150px;border:1px solid #3a4652;background:transparent;border-radius:9px;padding:9px 12px;font:inherit;font-size:14px;color:#fff}
.nl button{background:var(--oil);color:var(--ink);border:0;border-radius:9px;padding:9px 16px;font:inherit;font-size:14px;font-weight:700;cursor:pointer}
.allp{border-top:1px solid #2c3742;padding:16px 0;display:flex;flex-wrap:wrap;gap:10px 22px;font-size:14px;align-items:baseline}
.allp strong{color:#fff}
.allp .silo{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px}
.allp .silo-main{color:#fff;font-weight:600}
.allp .silo-main:hover{color:var(--oil)}
.allp .silo-sub{font-family:var(--f-g);font-weight:600;font-size:14.5px;color:#93a0ab;border:1px solid #2c3742;border-radius:6px;padding:1px 8px}
.allp .silo-sub:hover{color:#fff;border-color:#4a5764}
.cp{border-top:1px solid #2c3742;padding:16px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:13.5px;color:#8f9ba6}
.cp nav{display:flex;gap:16px;flex-wrap:wrap}

/* ---------- generic list (index/archive fallback) ---------- */
.plain{padding:24px 0 60px}
.plain h1{font-size:clamp(32px,4.4vw,46px);margin:10px 0 22px}
.pager{display:flex;justify-content:center;gap:6px;margin-top:34px;flex-wrap:wrap}
.pager .page-numbers{min-width:42px;text-align:center;border:1px solid var(--line);border-radius:8px;padding:7px 12px;font-size:15px;display:inline-block}
.pager .current{background:var(--ink);border-color:var(--ink);color:#fff}

@media (max-width:960px){
 .hero-in,.two{grid-template-columns:1fr;gap:30px}
 .hero-in{padding:34px 0}
 .mach,.grid{grid-template-columns:repeat(2,minmax(0,1fr))}
 .ft-top{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
 .hd-in{flex-wrap:wrap;gap:12px}
 .hd-search{max-width:none;margin:0;flex-basis:100%}
 .mach,.grid,.ft-top{grid-template-columns:1fr}
 .ans a{grid-template-columns:1fr;gap:0}
 .logo{font-size:21px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* ---------- simple article layout (until the full post template lands) ---------- */
.simple{max-width:min(calc(100% - 40px),820px)}
.simple h1{font-size:clamp(32px,4.4vw,46px);margin:8px 0 12px}
.entry h2{font-size:29px;margin:36px 0 10px}
.entry h3{font-size:23px;margin:28px 0 8px}
.entry p{margin:0 0 18px}
.entry a{color:var(--link);text-decoration:underline;text-underline-offset:2px}
.entry ul,.entry ol{padding-left:22px;margin:0 0 18px}
.entry li{margin-bottom:7px}
.entry img{border-radius:12px;margin:8px 0 20px}
.entry table{border-collapse:collapse;width:100%;font-size:15.5px;margin:0 0 22px;display:block;overflow-x:auto}
.entry th,.entry td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line)}
.entry th{background:var(--soft);font-size:14px;color:var(--steel)}
.entry blockquote{margin:0 0 22px;padding:2px 0 2px 18px;border-left:4px solid var(--oil);color:var(--steel)}

/* ---------- post template ---------- */
.ph{padding:6px 0 0}
.ph .k{font-size:14px;font-weight:600;color:var(--c)}
.ph h1{font-size:clamp(34px,4.6vw,52px);max-width:22ch;margin:10px 0 14px}
.meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;font-size:15px;color:var(--steel)}
.meta .who{display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:600}
.meta .who img{width:34px;height:34px;border-radius:50%}
.disc{font-size:14px;color:var(--steel);margin:16px 0 0}
.disc a{color:var(--link);text-decoration:underline}
.glance{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));border:1px solid var(--line);border-radius:12px;margin:26px 0 30px;overflow:hidden;background:var(--paper)}
.glance div{padding:14px 18px;border-right:1px solid var(--line)}
.glance div:last-child{border-right:0}
.glance small{display:block;font-size:13px;color:var(--steel)}
.glance b{font-family:var(--f-g);font-weight:700;font-size:26px;line-height:1.1}
.glance div:first-child{background:var(--ink)}
.glance div:first-child small{color:#aeb9c3}
.glance div:first-child b{color:var(--oil)}
.pg{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:52px;padding-bottom:60px}
.pg .prose{max-width:68ch}
.feat{margin:0 0 26px;border-radius:12px;overflow:hidden}
.feat img{width:100%}
.feat svg{width:90px;margin:40px auto;color:var(--c)}
.qa{border:2px solid var(--ink);border-radius:12px;padding:18px 22px;margin:0 0 26px}
.qa b{font-family:var(--f-h);font-size:21px;display:block;margin-bottom:4px}
.qa p{margin:0}
.toc-m{display:none;border:1px solid var(--line);border-radius:12px;padding:12px 18px;margin:0 0 26px}
.toc-m summary{font-family:var(--f-h);font-weight:600;font-size:18px;cursor:pointer}
.toc-m ol{margin:10px 0 4px;padding-left:20px;line-height:1.9}
.toc-m a{color:var(--link)}
.au{display:grid;grid-template-columns:88px minmax(0,1fr);gap:20px;border-top:3px solid var(--ink);padding-top:24px;margin-top:44px}
.au-ph img{width:88px;height:88px;border-radius:50%}
.au h3{font-size:22px;margin:0}
.au .role{font-size:14.5px;color:var(--steel);margin:0 0 8px}
.au p{margin:0 0 10px;font-size:16px}
.au a{color:var(--link);font-weight:600;font-size:15px}
.nx{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:34px}
.nx a{border:1px solid var(--line);border-radius:12px;padding:14px 18px}
.nx a:hover{border-color:var(--c)}
.nx small{display:block;font-size:13px;color:var(--steel)}
.nx b{font-family:var(--f-h);font-weight:600;font-size:18px;line-height:1.25}
.nx a.r{text-align:right}
.rel{margin-top:48px}
.rel h2{font-size:28px}
.side{position:sticky;top:20px;align-self:start;display:flex;flex-direction:column;gap:18px}
.box{border:1px solid var(--line);border-radius:12px;padding:18px 20px;background:var(--paper)}
.box h4{font-size:18px;margin-bottom:10px}
.toc a{display:block;padding:5px 0 5px 12px;border-left:2px solid var(--line);font-size:15px;color:var(--steel)}
.toc a:hover{color:var(--ink)}
.toc a.on{border-left-color:var(--oil);color:var(--ink);font-weight:600}
.more a{display:block;padding:9px 0;border-bottom:1px solid var(--line);font-size:15px;line-height:1.4}
.more a:last-child{border-bottom:0}
.more a:hover{color:var(--link)}
.more .hub{color:var(--c);font-weight:700}
.gchips{display:flex;flex-wrap:wrap;gap:6px;padding-top:12px;border-top:1px solid var(--line);margin-top:6px}
.gchips a{font-family:var(--f-g);font-weight:600;font-size:15px;color:var(--c);background:color-mix(in srgb,var(--c) 10%,#fff);border-radius:6px;padding:2px 9px;border-bottom:0}
@media (max-width:960px){
 .pg{grid-template-columns:1fr;gap:0}
 .side .toc{display:none}
 .toc-m{display:block}
 .side{position:static;margin-top:34px}
}
@media (max-width:640px){
 .nx{grid-template-columns:1fr}
 .nx a.r{text-align:left}
 .au{grid-template-columns:1fr}
}