/* PetroBind content pages (guides + Urdu page). Light theme only: dark mode is a landing-page feature.
   Shares the brand palette and the self-hosted Nunito Sans with the landing page. */
@font-face{font-family:'Nunito Sans';font-style:normal;font-weight:400 700;font-stretch:100%;font-display:swap;src:url(/fonts/nunito-sans-latin.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --ink:#072E33; --ink-2:#0C3F45; --mut:#4A6B63; --bg:#F6FAF3; --paper:#EAF2E3; --card:#FFFFFF;
  --line:#D3E0D0; --line-2:#BFD1BE; --lime:#A3D46F; --lime-2:#8CC25A; --teal:#228167; --teal-2:#5CAB6F; --deep:#005653;
  --warn:#B45309; --warn-bg:#FEF3E2; --note-bg:#EAF6E8;
  --sans:'Nunito Sans','Segoe UI',system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--sans);font-size:17px;line-height:1.7;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--deep);text-underline-offset:3px}
a:hover{color:var(--teal)}
:focus-visible{outline:3px solid var(--lime-2);outline-offset:2px;border-radius:4px}
.skip{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}
.skip:focus{position:fixed;top:10px;inset-inline-start:12px;width:auto;height:auto;overflow:visible;clip:auto;clip-path:none;background:var(--ink);color:#fff;padding:10px 16px;border-radius:8px;z-index:100}
.wrap{max-width:1040px;margin:0 auto;padding:0 24px}
.narrow{max-width:760px}

/* header */
.site-head{background:var(--ink);color:#E8F3EE;position:sticky;top:0;z-index:50}
.head-in{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:700;font-size:19px;letter-spacing:-.01em}
.brand:hover{color:#fff}
.drop{width:34px;height:34px;border-radius:10px;background:linear-gradient(150deg,#228167,#5CAB6F);display:grid;place-items:center;flex-shrink:0}
.drop svg{width:17px;height:17px}
.head-nav{display:flex;align-items:center;gap:22px;font-size:15px}
.head-nav a{color:#CFE6DC;text-decoration:none;font-weight:600}
.head-nav a:hover{color:#fff}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:999px;font:inherit;font-weight:700;font-size:15.5px;text-decoration:none;border:1.5px solid transparent;cursor:pointer;line-height:1.2}
.btn-lime{background:linear-gradient(135deg,#A3D46F,#80C06F);color:var(--ink)}
.btn-lime:hover{filter:brightness(1.05);color:var(--ink)}
.btn-line{border-color:var(--line-2);color:var(--ink);background:#fff}
.btn-line:hover{border-color:var(--teal);color:var(--ink)}
.head-nav .btn{padding:10px 20px;font-size:14.5px;color:var(--ink);white-space:nowrap}
@media (max-width:420px){.head-nav{gap:12px}.head-nav .btn{padding:9px 14px;font-size:13.5px}.brand{font-size:17px}}
@media (max-width:760px){.head-nav a:not(.btn){display:none}.head-nav a.keep{display:inline}}

/* page header */
.crumbs{font-size:14px;color:var(--mut);padding:22px 0 0}
.crumbs a{color:var(--mut);text-decoration:none}
.crumbs a:hover{color:var(--deep);text-decoration:underline}
.crumbs span{margin:0 7px;opacity:.6}
.page-hero{padding:18px 0 30px}
.eyebrow{font-size:12.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--teal)}
h1{font-size:clamp(31px,4.6vw,46px);line-height:1.1;letter-spacing:-.025em;margin:12px 0 18px;font-weight:700}
.lede{font-size:clamp(18px,2vw,20.5px);line-height:1.6;color:#27504B;max-width:46em;margin:0 0 24px}
.meta{font-size:14px;color:var(--mut);margin-top:6px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:6px}

/* article */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:48px;align-items:start;padding-bottom:40px}
.article{min-width:0}
.article>section{margin-top:44px}
.article>section:first-child{margin-top:0}
h2{font-size:clamp(25px,3.2vw,32px);line-height:1.18;letter-spacing:-.02em;margin:0 0 14px;font-weight:700;scroll-margin-top:84px}
h3{font-size:19.5px;line-height:1.3;margin:26px 0 8px;font-weight:700}
p{margin:0 0 16px}
ul,ol{margin:0 0 18px;padding-left:1.35em}
li{margin:0 0 8px}
li::marker{color:var(--teal)}
strong{font-weight:700}
.toc{position:sticky;top:84px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px;font-size:15px}
.toc b{display:block;font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);margin-bottom:10px}
.toc ol{list-style:none;padding:0;margin:0}
.toc li{margin:0 0 8px;line-height:1.35}
.toc a{text-decoration:none;color:var(--ink);font-weight:600}
.toc a:hover{color:var(--teal)}
@media (max-width:900px){.layout{grid-template-columns:1fr;gap:0}.toc{position:static;margin:0 0 26px}}

/* components */
.callout{background:var(--note-bg);border:1px solid #CFE3CB;border-left:5px solid var(--teal-2);border-radius:12px;padding:18px 22px;margin:22px 0}
.callout p:last-child{margin-bottom:0}
.callout.warn{background:var(--warn-bg);border-color:#F3D9AE;border-left-color:#E0A24A}
.formula{font-size:19px;font-weight:700;background:var(--ink);color:#EAF6E8;border-radius:12px;padding:18px 22px;margin:20px 0;line-height:1.5}
.formula span{color:var(--lime)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:14px;margin:20px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 18px 8px}
.card h3{margin:0 0 6px;font-size:17px}
.card p{font-size:15.5px;color:#34554F;margin-bottom:12px}
.card ul{margin:0 0 12px;padding-left:1.15em}
.card li{font-size:15.5px;line-height:1.5;margin-bottom:7px}
.cards.two{grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width:620px){.cards.two{grid-template-columns:1fr}}
.tag{display:inline-block;font-size:11.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--deep);border:1px solid var(--line-2);border-radius:999px;padding:1px 9px;margin-left:6px;vertical-align:2px;background:#fff}
.tbl{width:100%;border-collapse:collapse;margin:18px 0;font-size:16px;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.tbl caption{text-align:left;font-size:14px;color:var(--mut);padding:0 0 8px;caption-side:top}
.tbl th,.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--paper);font-size:13.5px;letter-spacing:.04em;text-transform:uppercase;color:#27504B}
.tbl tr:last-child td{border-bottom:0}
.tbl .r{text-align:right;font-variant-numeric:tabular-nums}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.fig{margin:24px 0}
.fig img{display:block;width:auto;max-width:100%;height:auto;border-radius:14px;border:1px solid var(--line)}
.fig figcaption{font-size:14px;color:var(--mut);margin-top:8px}
.steps{counter-reset:s;list-style:none;padding:0;margin:20px 0}
.steps li{counter-increment:s;position:relative;padding:0 0 0 52px;margin:0 0 20px}
.steps li::before{content:counter(s);position:absolute;left:0;top:-2px;width:36px;height:36px;border-radius:50%;background:#CFEBB4;color:var(--ink);font-weight:800;display:grid;place-items:center}
.steps li b{display:block;font-size:18px;margin-bottom:2px}
.timeline{list-style:none;padding:0;margin:20px 0;border-left:3px solid var(--line-2)}
.timeline li{position:relative;padding:0 0 0 22px;margin:0 0 22px}
.timeline li::before{content:"";position:absolute;left:-9px;top:8px;width:15px;height:15px;border-radius:50%;background:var(--teal-2);border:3px solid var(--bg)}
.timeline time{display:block;font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--teal)}
.sources{font-size:15px}
.sources li{margin-bottom:6px}

/* faq */
.qa{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:0 0 10px}
.qa summary{cursor:pointer;list-style:none;padding:16px 48px 16px 20px;font-weight:700;position:relative;line-height:1.4}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--teal);transition:transform .15s}
.qa[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.qa p{padding:0 20px;margin:0 0 16px;color:#34554F}

/* calculator */
.calc{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;margin:22px 0}
.calc h3{margin:0 0 4px}
.calc .hint{font-size:14.5px;color:var(--mut);margin:0 0 16px}
.calc-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 18px}
.calc label{display:block;font-size:14px;font-weight:700;margin-bottom:5px}
.calc input{width:100%;font:inherit;font-size:17px;padding:11px 13px;border:1.5px solid var(--line-2);border-radius:10px;background:#fff;color:var(--ink);font-variant-numeric:tabular-nums}
.calc input:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px rgba(92,171,111,.25)}
.calc-out{margin-top:20px;border-radius:12px;padding:18px 20px;background:var(--paper);border:1px solid var(--line)}
.calc-out dl{display:grid;grid-template-columns:1fr auto;gap:6px 18px;margin:0}
.calc-out dt{color:#34554F}
.calc-out dd{margin:0;text-align:right;font-weight:700;font-variant-numeric:tabular-nums}
.verdict{margin:14px 0 0;font-weight:700}
.verdict.loss{color:#B42318}.verdict.gain{color:#B45309}.verdict.ok{color:var(--teal)}
@media (max-width:560px){.calc-grid{grid-template-columns:1fr}}

/* cta + related + footer */
.cta{background:var(--ink);color:#EAF6E8;border-radius:20px;padding:34px 34px;margin:46px 0 0;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta h2{color:#fff;margin:0 0 6px;font-size:clamp(23px,3vw,29px)}
.cta p{margin:0;color:#BFE0D2;max-width:34em}
.related{margin-top:46px}
.related .cards{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.related a.card{text-decoration:none;color:var(--ink);display:block;padding-bottom:16px}
.related a.card:hover{border-color:var(--teal-2);box-shadow:0 12px 28px -18px rgba(0,86,83,.5)}
.related .go{font-weight:700;color:var(--deep);font-size:15px}
.site-foot{margin-top:60px;background:var(--ink);color:#B9D6CA;font-size:15px;padding:38px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:30px}
.site-foot h4{margin:0 0 10px;font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:#8FBFA8}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin:0 0 8px}
.site-foot a{color:#DDEEE6;text-decoration:none}
.site-foot a:hover{color:#fff;text-decoration:underline}
.foot-note{margin-top:26px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:13.5px;color:#8FB5A3}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr}.cta{padding:26px 22px}}

/* Urdu page */
:lang(ur){font-family:'Noto Nastaliq Urdu','Jameel Noori Nastaleeq','Alvi Nastaleeq','Noto Naskh Arabic','Segoe UI',Tahoma,sans-serif}
[dir="rtl"] body,body[dir="rtl"]{line-height:2.05;font-size:18px}
[dir="rtl"] h1,[dir="rtl"] h2,[dir="rtl"] h3{line-height:1.7;letter-spacing:0}
[dir="rtl"] .eyebrow{letter-spacing:0;font-size:15px;text-transform:none}
[dir="rtl"] ul,[dir="rtl"] ol{padding-left:0;padding-right:1.35em}
[dir="rtl"] .card ul{padding-right:1.15em}
[dir="rtl"] .tbl th,[dir="rtl"] .tbl td,[dir="rtl"] .tbl caption{text-align:right}
[dir="rtl"] .qa summary{padding:16px 20px 16px 48px}
[dir="rtl"] .qa summary::after{right:auto;left:18px}
[dir="rtl"] .steps li{padding:0 52px 0 0}
[dir="rtl"] .steps li::before{left:auto;right:0}
[dir="rtl"] .callout{border-left-width:1px;border-right:5px solid var(--teal-2)}
[dir="rtl"] .tag{margin-left:0;margin-right:6px}
.ltr{direction:ltr;unicode-bidi:isolate;display:inline-block}
@media print{.site-head,.site-foot,.toc,.cta,.hero-actions{display:none}body{background:#fff}}