/* ==========================================================================
   قياس — هوية بصرية مستوحاة من أدوات القياس الهندسية (مسطرة، فرجار، ورق مربعات)
   ========================================================================== */
:root{
  --paper:      #F1ECDE;
  --paper-line: #E4DCC5;
  --surface:    #FBF9F2;
  --ink:        #222A3B;
  --ink-soft:   #5C6478;
  --line:       #D8CFB2;
  --brass:      #96702F;
  --brass-soft: #C9A968;
  --red:        #AE3A34;
  --green:      #3E6B52;

  --font-display: "Reem Kufi", sans-serif;
  --font-body:    "IBM Plex Sans Arabic", sans-serif;
  --font-mono:    "IBM Plex Mono", monospace;

  --radius: 3px;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  background:
    linear-gradient(var(--paper-line) 1px, transparent 1px) 0 0/100% 34px,
    linear-gradient(90deg, var(--paper-line) 1px, transparent 1px) 0 0/34px 100%,
    var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.85;
  font-size:16px;
}
a{ color:var(--brass); text-decoration:none; }
a:hover{ color:var(--red); }
img{ max-width:100%; display:block; }
:focus-visible{ outline:2px solid var(--red); outline-offset:2px; }

.container{ max-width:1120px; margin:0 auto; padding:0 6vw; }

/* --------------------------------------------------------------------------
   Tick-mark divider — العنصر المميّز: خط مسطرة مدرّج، يفصل الأقسام
   -------------------------------------------------------------------------- */
.ruler-divider{
  height:18px;
  margin:0 auto;
  max-width:1120px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 8px),
                     repeating-linear-gradient(90deg, var(--ink-soft) 0 1.5px, transparent 1.5px 40px);
  background-position: 0 0, 0 0;
  background-repeat: repeat-x;
  background-size: 8px 10px, 40px 18px;
  opacity:.55;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header{
  border-bottom:1px solid var(--line);
  padding:18px 0;
  position:sticky; top:0; z-index:20;
  background:var(--paper)e6;
  backdrop-filter:blur(6px);
}
.site-header .bar{ display:flex; align-items:center; justify-content:space-between; }
.brand{
  font-family:var(--font-display);
  font-size:1.5rem; color:var(--ink);
  display:flex; align-items:center; gap:8px;
}
.brand .mark{
  width:10px; height:10px; background:var(--red); border-radius:1px;
  box-shadow: 6px 0 0 var(--brass), 12px 0 0 var(--green);
}
.main-nav{ display:flex; gap:26px; font-size:.92rem; }
.main-nav a{ color:var(--ink-soft); }
.main-nav a.active, .main-nav a:hover{ color:var(--ink); border-bottom:2px solid var(--red); padding-bottom:2px; }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero{ padding:64px 0 40px; }
.hero-eyebrow{
  font-family:var(--font-mono); font-size:.78rem; letter-spacing:.1em;
  color:var(--brass); display:flex; align-items:center; gap:10px; margin-bottom:18px;
}
.hero-eyebrow .dash{ width:26px; height:1px; background:var(--brass); }
h1.hero-title{ font-family:var(--font-display); font-size:2.6rem; line-height:1.45; max-width:16ch; margin-bottom:18px; }
.hero p.lead{ color:var(--ink-soft); font-size:1.08rem; max-width:56ch; margin-bottom:26px; }

/* Live-readout demo strip in hero */
.readout-demo{
  display:inline-flex; align-items:center; gap:14px;
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:14px 20px; font-family:var(--font-mono); font-size:1.1rem;
}
.readout-demo .eq{ color:var(--ink-soft); }
.readout-demo b{ color:var(--red); font-weight:700; }

.badges{ display:flex; flex-wrap:wrap; gap:10px 22px; margin-top:28px; font-size:.82rem; color:var(--ink-soft); }
.badges span{ display:flex; align-items:center; gap:6px; }
.badges span::before{ content:"■"; color:var(--green); font-size:.6rem; }

/* --------------------------------------------------------------------------
   Buttons / form controls
   -------------------------------------------------------------------------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  background:var(--ink); color:var(--paper);
  border:none; border-radius:var(--radius);
  padding:12px 22px; font-family:var(--font-body); font-weight:700; font-size:.95rem;
  cursor:pointer; transition:transform .12s ease, background .15s ease;
}
.btn:hover{ background:var(--red); }
.btn:active{ transform:scale(.97); }
.btn.outline{ background:transparent; color:var(--ink); border:1px solid var(--line); }
.btn.outline:hover{ border-color:var(--red); color:var(--red); background:transparent; }
.btn.outline.on{ background:var(--ink); color:var(--paper); border-color:var(--ink); }
.btn:disabled{ opacity:.4; cursor:not-allowed; }

input[type="text"], input[type="number"], input[type="email"], textarea, select{
  width:100%; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:11px 13px; font-family:var(--font-mono); font-size:1rem; color:var(--ink);
}
input:focus, select:focus, textarea:focus{ border-color:var(--brass); }
label{ display:block; font-size:.85rem; color:var(--ink-soft); margin-bottom:6px; }
.field{ margin-bottom:16px; }

/* --------------------------------------------------------------------------
   Converter tool
   -------------------------------------------------------------------------- */
.tool-section{ padding:20px 0 60px; }
.category-tabs{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:28px; }
.category-tabs button{
  font-family:var(--font-body); font-size:.88rem; color:var(--ink-soft);
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:9px 16px; cursor:pointer;
}
.category-tabs button.active{ background:var(--ink); color:var(--paper); border-color:var(--ink); }

.converter-card{
  background:var(--surface); border:1px solid var(--line); border-radius:6px;
  padding:32px; display:grid; grid-template-columns:1fr auto 1fr; gap:22px; align-items:end;
}
.converter-card .swap-btn{
  width:42px; height:42px; border-radius:50%; border:1px solid var(--line); background:var(--paper);
  display:flex; align-items:center; justify-content:center; cursor:pointer; font-size:1.1rem; color:var(--brass);
  margin-bottom:2px;
}
.converter-card .swap-btn:hover{ border-color:var(--red); color:var(--red); }
.readout{
  font-family:var(--font-mono); font-size:1.6rem; color:var(--ink); direction:ltr; text-align:left;
  border-top:2px solid var(--red); padding-top:6px; margin-top:8px;
}
.note{ font-size:.78rem; color:var(--ink-soft); margin-top:10px; }

.quick-table{ margin-top:36px; }
.quick-table table{ width:100%; border-collapse:collapse; }
.quick-table th, .quick-table td{
  padding:10px 14px; text-align:right; border-bottom:1px solid var(--line); font-size:.9rem;
}
.quick-table th{ font-family:var(--font-mono); color:var(--brass); font-weight:500; font-size:.8rem; }
.quick-table td.val{ font-family:var(--font-mono); }

.ad-slot{ border:1px dashed var(--line); color:var(--ink-soft); font-family:var(--font-mono); font-size:.75rem; text-align:center; padding:18px; margin:44px 0; }

/* --------------------------------------------------------------------------
   Generic content pages (prose)
   -------------------------------------------------------------------------- */
.page-hero{ padding:56px 0 36px; border-bottom:1px solid var(--line); }
.page-hero h1{ font-family:var(--font-display); font-size:2.1rem; margin-bottom:12px; }
.page-hero p{ color:var(--ink-soft); max-width:60ch; }

.prose{ max-width:760px; margin:40px auto; }
.prose h2{ font-family:var(--font-display); font-size:1.4rem; margin:38px 0 14px; border-bottom:2px solid var(--red); display:inline-block; padding-bottom:4px; }
.prose p{ margin-bottom:16px; }
.prose ul, .prose ol{ margin:0 0 18px; padding-inline-start:22px; }
.prose li{ margin-bottom:8px; }
.prose strong{ color:var(--red); }
.prose code{ background:var(--surface); border:1px solid var(--line); padding:2px 6px; border-radius:3px; font-family:var(--font-mono); font-size:.9em; }
.prose table{ width:100%; border-collapse:collapse; margin:20px 0; }
.prose th, .prose td{ padding:10px 12px; border-bottom:1px solid var(--line); text-align:right; }
.prose th{ font-family:var(--font-mono); color:var(--brass); font-size:.82rem; }

/* Blog index */
.blog-list{ display:flex; flex-direction:column; border:1px solid var(--line); margin:24px 0 60px; }
.blog-item{ display:block; padding:24px; border-bottom:1px solid var(--line); text-decoration:none; }
.blog-item:last-child{ border-bottom:none; }
.blog-item:hover{ background:var(--surface); }
.blog-item .eyebrow{ font-family:var(--font-mono); font-size:.72rem; color:var(--brass); letter-spacing:.06em; display:block; margin-bottom:8px; }
.blog-item h3{ font-family:var(--font-display); font-size:1.15rem; color:var(--ink); margin-bottom:6px; }
.blog-item p{ color:var(--ink-soft); font-size:.9rem; margin:0; }

/* Contact form */
.contact-grid{ display:grid; grid-template-columns:1.2fr .8fr; gap:60px; padding:40px 0 70px; }
.contact-info h2{ font-family:var(--font-display); font-size:1.2rem; margin-bottom:14px; }
.contact-info p{ color:var(--ink-soft); margin-bottom:10px; }
.contact-info a{ font-family:var(--font-mono); color:var(--red); }

footer{ margin-top:20px; border-top:1px solid var(--line); padding:34px 0; text-align:center; color:var(--ink-soft); font-size:.85rem; }
footer .footer-links{ display:flex; justify-content:center; gap:20px; margin-bottom:14px; flex-wrap:wrap; }
footer .footer-links a{ color:var(--ink-soft); }
footer .footer-links a:hover{ color:var(--red); }

@media (max-width:760px){
  h1.hero-title{ font-size:2rem; }
  .converter-card{ grid-template-columns:1fr; }
  .converter-card .swap-btn{ justify-self:center; transform:rotate(90deg); }
  .contact-grid{ grid-template-columns:1fr; gap:36px; }
  .main-nav{ gap:14px; flex-wrap:wrap; }
}


/* SEO-friendly content and navigation */
.breadcrumbs{max-width:1100px;margin:18px auto 0;padding:0 20px;color:var(--muted,#777);font-size:.88rem}
.breadcrumbs a{color:inherit;text-decoration:none}
.breadcrumbs a:hover{text-decoration:underline}
.content-section{padding:54px 0}
.content-section h2{margin:0 0 12px}
.content-section p{max-width:850px;line-height:1.9;color:var(--muted,#666)}
.guide-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:24px 0 34px}
.guide-links a{display:block;padding:15px 16px;border:1px solid rgba(0,0,0,.1);border-radius:12px;text-decoration:none;color:inherit;background:rgba(255,255,255,.55)}
.guide-links a:hover{transform:translateY(-1px)}
.related-articles{max-width:850px;margin:42px auto;padding:24px;border:1px solid rgba(0,0,0,.1);border-radius:14px}
.related-articles h2{margin-top:0}
.related-articles ul{margin:0;padding-right:22px;line-height:2}


/* Indexing navigation */
.all-articles-index,.related-articles{margin:2rem 0;padding:1.25rem;border-radius:12px}.all-articles-index ul,.related-articles ul{padding-inline-start:1.5rem}.all-articles-index li,.related-articles li{margin:.5rem 0}