/* Global Fuel Calculator — stylesheet
   Design language: a measuring instrument on a dark dashboard. Deep,
   low-glare slate background rather than paper-white, with a restrained
   neon green / cyan accent pair for actions and readouts. No large area
   of pure white anywhere, so the page is comfortable at night and on a
   phone screen. */

:root {
  --bg:         #0A0F0E;   /* page background */
  --surface:    #10201B;   /* input fields, table rows */
  --panel:      #14251F;   /* cards, calculator panel */
  --panel-2:    #182B24;   /* readout / raised panel */
  --line:       #24413A;   /* borders */
  --line-soft:  #1B332C;

  --ink:        #E7F3EE;   /* primary text — off-white, not pure white */
  --ink-soft:   #9FC4B8;   /* secondary text */
  --ink-dim:    #6E9186;

  --neon:       #39E28D;   /* primary accent — soft neon green */
  --neon-dim:   #27A968;
  --neon-2:     #4FD8D8;   /* secondary accent — soft neon cyan */
  --amber:      #E0A83E;
  --red:        #E0716A;

  --focus:      #39E28D;

  --sp: 1rem;
  --maxw: 68rem;
  --radius: 4px;

  --f: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-ur: "Noto Nastaliq Urdu", var(--f);
}

*, *::before, *::after { box-sizing: border-box; }
img { max-width: 100%; height: auto; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--f);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  font-feature-settings: "tnum" 1;
}
html[dir="rtl"] body { font-family: var(--f-ur); line-height: 1.9; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.018em; margin: 0 0 0.5em; font-weight: 600; color: var(--ink); }
h1 { font-size: clamp(1.9rem, 1.2rem + 2.6vw, 3rem); }
h2 { font-size: clamp(1.4rem, 1.1rem + 1.1vw, 1.9rem); margin-top: 2.5rem; }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 1rem; max-width: 68ch; color: var(--ink); }

a { color: var(--neon-2); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--neon); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 1.25rem; }
.skip { position: absolute; inset-inline-start: -9999px; }
.skip:focus { position: static; display: inline-block; padding: .5rem 1rem; background: var(--neon); color: #06120D; }

/* ---------- header ---------- */
.site-head { background: #081310; border-bottom: 1px solid var(--line-soft); }
.site-head a { color: var(--ink); text-decoration: none; }
.head-row { display: flex; align-items: center; gap: 1.5rem; padding-block: .9rem; flex-wrap: wrap; }
.brand { font-weight: 600; letter-spacing: -0.02em; font-size: 1.05rem; display: flex; align-items: center; gap: .55rem; }
.brand-mark { width: 1.6rem; height: auto; flex: none; display: block; }
.site-head nav { margin-inline-start: auto; display: flex; gap: 1.25rem; font-size: .95rem; }
.site-head nav a { color: var(--ink-soft); }
.site-head nav a:hover { color: var(--neon); text-decoration: underline; }

/* ---------- hero ---------- */
.hero { background: linear-gradient(180deg, #0C1613, var(--bg)); padding-block: 2.5rem 3.25rem; border-bottom: 1px solid var(--line-soft); }
.hero h1 { color: var(--ink); max-width: 17ch; }
.hero p { color: var(--ink-soft); font-size: 1.1rem; max-width: 56ch; }
.hero-row { display: flex; align-items: center; gap: 2rem; flex-wrap: wrap; }
.hero-row > div { flex: 1 1 26rem; }
.hero-art { flex: 1 1 20rem; max-width: 28rem; width: 100%; height: auto; border-radius: var(--radius); display: block; }
@media (max-width: 56rem) { .hero-art { order: -1; max-width: 20rem; margin-inline: auto; } }

/* page-level hero images on calculator and country pages */
.page-hero { margin: 1rem 0 1.5rem; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); }
.page-hero img { width: 100%; height: auto; display: block; }
.strip-img { width: 100%; height: auto; display: block; border-radius: var(--radius); margin: 1.5rem 0; border: 1px solid var(--line); }

/* ---------- calculator panel ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1px 0 var(--line-soft);
}
.panel-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--line-soft); flex-wrap: wrap;
}
.panel-head h2 { margin: 0; font-size: 1.1rem; }
.panel-body { padding: 1.25rem; }
.calc-lift { margin-top: -2.25rem; position: relative; z-index: 2; }

.fields { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 42rem) { .fields { grid-template-columns: 1fr 1fr; } }

.field label { display: block; font-size: .9rem; font-weight: 500; margin-bottom: .3rem; color: var(--ink-soft); }
.field .hint { font-size: .8rem; color: var(--ink-dim); margin-top: .25rem; }
.control { display: flex; }
.control input, .control select, select.solo {
  font: inherit; color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); padding: .6rem .7rem; min-width: 0;
}
.control input::placeholder { color: var(--ink-dim); }
.control input { flex: 1 1 auto; border-start-start-radius: var(--radius); border-end-start-radius: var(--radius); }
.control select {
  flex: 0 0 auto; border-inline-start: 0; background: #0D1B17;
  border-start-end-radius: var(--radius); border-end-start-radius: 0; border-end-end-radius: var(--radius);
}
select.solo { width: 100%; border-radius: var(--radius); }
.control input:focus, .control select:focus, select.solo:focus { outline: 2px solid var(--focus); outline-offset: -1px; }
.control.invalid input { border-color: var(--red); }
.err { color: var(--red); font-size: .82rem; margin-top: .25rem; min-height: 1.1em; }

.actions { display: flex; gap: .75rem; margin-top: 1.25rem; flex-wrap: wrap; }
.btn {
  font: inherit; font-weight: 600; cursor: pointer; border-radius: var(--radius);
  padding: .65rem 1.4rem; border: 1px solid transparent;
}
.btn-primary { background: var(--neon); color: #06170F; }
.btn-primary:hover { background: var(--neon-dim); }
.btn-quiet { background: transparent; color: var(--ink-soft); border-color: var(--line); }
.btn-quiet:hover { color: var(--ink); border-color: var(--ink-dim); }

/* ---------- readout ---------- */
.readout { border-top: 1px solid var(--line); background: var(--panel-2); }
.readout .primary {
  padding: 1.25rem; border-bottom: 1px solid var(--line-soft);
  display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap;
}
.readout .primary .num {
  font-size: clamp(2.2rem, 1.4rem + 3vw, 3.2rem); font-weight: 600;
  letter-spacing: -0.03em; color: var(--neon); line-height: 1;
}
.readout .primary .unit { color: var(--ink-soft); font-size: 1rem; }
.strip { display: grid; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 46rem) { .strip { grid-template-columns: repeat(4, 1fr); } }
.strip .cell { padding: .85rem 1.25rem; border-inline-end: 1px solid var(--line-soft); border-top: 1px solid var(--line-soft); }
.strip .cell:last-child { border-inline-end: 0; }
.strip .k { display: block; font-size: .78rem; color: var(--ink-dim); margin-bottom: .15rem; }
.strip .v { font-size: 1.15rem; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); }
.readout .empty { padding: 1.25rem; color: var(--ink-dim); }
.readout[hidden] { display: none; }

/* ---------- generic sections ---------- */
main { padding-bottom: 3rem; }
section { margin-top: 2.25rem; }
.lede { font-size: 1.1rem; color: var(--ink-soft); }

.grid { display: grid; gap: .75rem; grid-template-columns: 1fr; }
@media (min-width: 36rem) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 56rem) { .grid.g3 { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 56rem) { .grid.g4 { grid-template-columns: repeat(4, 1fr); } }

.tile {
  display: block; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: .85rem 1rem; text-decoration: none; color: var(--ink);
}
.tile:hover { border-color: var(--neon-dim); }
.tile .t { font-weight: 600; display: block; color: var(--ink); }
.tile .s { font-size: .85rem; color: var(--ink-soft); }

/* ---------- country search ---------- */
.finder { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; }
.finder input { width: 100%; font: inherit; padding: .7rem .8rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); }
.finder input::placeholder { color: var(--ink-dim); }
.finder ul { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; gap: .5rem; grid-template-columns: 1fr; }
@media (min-width: 40rem) { .finder ul { grid-template-columns: repeat(3, 1fr); } }
.finder li a { display: block; padding: .5rem .7rem; border: 1px solid var(--line-soft); border-radius: var(--radius); text-decoration: none; color: var(--ink); }
.finder li a:hover { border-color: var(--neon-dim); }
.finder .none { color: var(--ink-dim); margin-top: 1rem; }

/* ---------- tables, faq, notes ---------- */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; background: var(--panel); font-size: .95rem; }
th, td { text-align: start; padding: .6rem .8rem; border-bottom: 1px solid var(--line-soft); color: var(--ink); }
th { font-weight: 600; background: var(--surface); color: var(--ink-soft); }

details.faq { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: .5rem; }
details.faq summary { cursor: pointer; padding: .85rem 1rem; font-weight: 500; list-style: none; color: var(--ink); }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; float: inline-end; color: var(--neon); font-weight: 600; }
details.faq[open] summary::after { content: "\2212"; }
details.faq .a { padding: 0 1rem 1rem; color: var(--ink-soft); }
details.faq .a p { margin: 0; }

.note {
  border-inline-start: 3px solid var(--amber); background: #1E1A0E;
  padding: .75rem 1rem; font-size: .92rem; color: #E8CE9A; border-radius: 0 var(--radius) var(--radius) 0;
}

.crumbs { font-size: .85rem; color: var(--ink-dim); padding-block: 1rem 0; }
.crumbs a { color: var(--ink-dim); }

.prose h2 { margin-top: 2rem; }
.prose p { margin-bottom: 1rem; }

/* related-search terms — a quiet inline row, not a heading, folded into
   whichever section it appears in rather than called out on its own */
.chips-row { margin-top: 1.25rem; }
.chips-label {
  display: inline-block; font-size: .78rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .04em; color: var(--ink-dim); margin-bottom: .5rem;
}
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip {
  display: inline-block; font-size: .85rem; color: var(--ink-soft);
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 999px; padding: .35rem .85rem;
}

/* ---------- footer ---------- */
.site-foot { background: #081310; color: var(--ink-soft); margin-top: 3rem; padding-block: 2.5rem 2rem; font-size: .92rem; border-top: 1px solid var(--line-soft); }
.site-foot a { color: var(--ink-soft); text-decoration: none; }
.site-foot a:hover { text-decoration: underline; color: var(--neon); }
.foot-cols { display: grid; gap: 1.75rem; grid-template-columns: 1fr; }
@media (min-width: 46rem) { .foot-cols { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.site-foot h3 { color: var(--ink); font-size: .9rem; margin-bottom: .6rem; }
.site-foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .35rem; }
.foot-base { margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--line-soft); font-size: .85rem; color: var(--ink-dim); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }