/* ===========================================================
   Pythagor Square DZ — Design tokens
   Palette inspired by Algerian banknotes, Algiers stone & the
   street-corner currency trade ("la Square").
   =========================================================== */
:root{
  --ink:        #1A1A1A;
  --paper:      #F4EDDD;   /* warm sand / aged paper */
  --paper-2:    #ECE2C9;
  --green:      #0C5C42;   /* dinar / flag green */
  --green-dark: #07402E;
  --brass:      #C08A35;   /* old coin / stamp ink */
  --brass-dark: #8E661F;
  --chalk:      #EDEAE2;
  --slate:      #2B2B28;
  --red-stamp:  #8C2F1B;
  --line:       rgba(26,26,26,0.14);
  --shadow:     0 14px 30px rgba(20,16,8,0.16);

  --font-display: "Cairo", "IBM Plex Sans Arabic", "Tajawal", "Inter", sans-serif;
  --font-body:    "IBM Plex Sans Arabic", "Cairo", "Inter", sans-serif;
  --font-data:    "IBM Plex Sans", "IBM Plex Sans Arabic", monospace;
  --font-serif:   "Source Serif 4", "Noto Naskh Arabic", serif;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
body[dir="rtl"]{font-family:var(--font-body);}
body[dir="ltr"]{font-family:"Inter","Source Serif 4",sans-serif;}

img{max-width:100%;display:block;}
a{color:inherit;}

.container{
  max-width:1080px;
  margin:0 auto;
  padding:0 20px;
}

/* subtle paper texture */
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background-image:
    radial-gradient(circle at 20% 10%, rgba(192,138,53,0.06), transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(12,92,66,0.05), transparent 45%);
  z-index:0;
}

/* ---------------- Header ---------------- */
.site-header{
  position:relative;
  z-index:2;
  border-bottom:3px solid var(--ink);
  background:var(--paper);
}
.site-header .bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 0;
  gap:16px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--ink);
}
.brand-mark{
  width:42px;height:42px;
  border-radius:50%;
  border:2px solid var(--ink);
  display:flex;align-items:center;justify-content:center;
  background:var(--brass);
  color:var(--paper);
  font-family:var(--font-display);
  font-weight:800;
  font-size:18px;
  flex-shrink:0;
}
.brand-text{
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.15rem;
  letter-spacing:0.01em;
}
.brand-text small{
  display:block;
  font-weight:500;
  font-size:0.72rem;
  color:var(--brass-dark);
  letter-spacing:0.06em;
}
.lang-switch{
  display:flex;
  gap:6px;
  font-family:var(--font-data);
  font-size:0.82rem;
}
.lang-switch a{
  padding:6px 12px;
  border:1.5px solid var(--ink);
  border-radius:3px;
  text-decoration:none;
  font-weight:600;
}
.lang-switch a.active{
  background:var(--ink);
  color:var(--paper);
}

/* ---------------- Hero ---------------- */
.hero{
  position:relative;
  z-index:1;
  padding:52px 0 36px;
}
.hero-grid{
  display:grid;
  grid-template-columns:1.2fr 1fr;
  gap:40px;
  align-items:center;
}
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;}
}
.eyebrow{
  font-family:var(--font-data);
  text-transform:uppercase;
  letter-spacing:0.14em;
  font-size:0.74rem;
  color:var(--brass-dark);
  font-weight:700;
  margin:0 0 10px;
}
h1.hero-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.9rem,4.2vw,3rem);
  line-height:1.15;
  margin:0 0 16px;
  color:var(--green-dark);
}
.hero-sub{
  font-size:1.05rem;
  color:var(--slate);
  max-width:46ch;
  margin:0 0 18px;
}
.updated-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-data);
  font-size:0.8rem;
  background:var(--chalk);
  border:1px solid var(--line);
  border-radius:40px;
  padding:7px 14px;
}
.dot-live{
  width:8px;height:8px;border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 0 rgba(12,92,66,0.5);
  animation:pulse 2s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(12,92,66,0.45);}
  70%{box-shadow:0 0 0 6px rgba(12,92,66,0);}
  100%{box-shadow:0 0 0 0 rgba(12,92,66,0);}
}

/* hero illustration: two stamped slips */
.hero-art{
  position:relative;
  height:230px;
}
.slip{
  position:absolute;
  width:190px;
  padding:14px 16px;
  border-radius:4px;
  font-family:var(--font-data);
  font-size:0.78rem;
}
.slip-bank{
  top:6px; left:0;
  background:var(--paper-2);
  border:1px solid var(--ink);
  transform:rotate(-4deg);
  box-shadow:var(--shadow);
  color:var(--green-dark);
}
.slip-square{
  top:60px; left:90px;
  background:var(--slate);
  color:var(--chalk);
  border:1px dashed var(--brass);
  transform:rotate(3deg);
  box-shadow:var(--shadow);
}
[dir="rtl"] .slip-bank{left:auto;right:0;}
[dir="rtl"] .slip-square{left:auto;right:90px;}
.slip b{font-family:var(--font-display);font-size:1rem;display:block;margin-bottom:4px;}

/* ---------------- Rates section ---------------- */
.section{padding:34px 0;position:relative;z-index:1;}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:18px;flex-wrap:wrap;}
h2.section-title{
  font-family:var(--font-display);
  font-size:1.5rem;
  font-weight:800;
  margin:0;
  color:var(--ink);
}
.section-note{font-size:0.85rem;color:var(--slate);opacity:0.85;}

.rate-table-wrap{
  border:2px solid var(--ink);
  border-radius:8px;
  overflow:hidden;
  background:var(--chalk);
}
table.rates{
  width:100%;
  border-collapse:collapse;
  font-family:var(--font-data);
}
table.rates th, table.rates td{
  padding:14px 16px;
  text-align:start;
  border-bottom:1px solid var(--line);
  font-size:0.95rem;
}
table.rates thead th{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-weight:700;
  font-size:0.8rem;
  text-transform:uppercase;
  letter-spacing:0.04em;
}
table.rates tbody tr:last-child td{border-bottom:none;}
table.rates tbody tr:hover{background:var(--paper-2);}
.cur-name{display:flex;align-items:center;gap:10px;font-family:var(--font-body);font-weight:700;}
.flag-chip{
  width:26px;height:18px;border-radius:2px;
  display:inline-block;border:1px solid var(--line);
  background-size:cover;background-position:center;
  flex-shrink:0;
}
td.val{font-weight:700;font-size:1.02rem;white-space:nowrap;}
td.val.bank{color:var(--green-dark);}
td.val.square{color:var(--red-stamp);}
.delta{font-size:0.78rem;font-weight:600;margin-inline-start:6px;}
.delta.up{color:var(--green);}
.delta.down{color:var(--red-stamp);}
.spread-badge{
  display:inline-block;
  font-family:var(--font-data);
  font-size:0.74rem;
  font-weight:700;
  padding:3px 9px;
  border-radius:30px;
  background:rgba(140,47,27,0.1);
  color:var(--red-stamp);
}

.skel{
  display:inline-block;width:64px;height:14px;border-radius:3px;
  background:linear-gradient(90deg,var(--line),rgba(0,0,0,0.05),var(--line));
  background-size:200% 100%;
  animation:shimmer 1.3s infinite;
}
@keyframes shimmer{0%{background-position:200% 0;}100%{background-position:-200% 0;}}

/* ---------------- Converter ---------------- */
.converter{
  background:var(--green-dark);
  color:var(--paper);
  border-radius:10px;
  padding:28px;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:18px;
  align-items:end;
}
@media (max-width:700px){
  .converter{grid-template-columns:1fr;}
  .conv-swap{justify-self:center;}
}
.conv-field label{
  display:block;font-size:0.78rem;font-family:var(--font-data);
  text-transform:uppercase;letter-spacing:0.06em;
  margin-bottom:8px;color:var(--brass);
}
.conv-field input, .conv-field select{
  width:100%;
  padding:12px 14px;
  border-radius:6px;
  border:none;
  font-family:var(--font-data);
  font-size:1.05rem;
  background:var(--paper);
  color:var(--ink);
}
.conv-mode{
  display:flex;gap:8px;margin-top:14px;
}
.conv-mode button{
  flex:1;
  padding:9px 10px;
  border-radius:6px;
  border:1.5px solid rgba(244,237,221,0.4);
  background:transparent;
  color:var(--paper);
  font-family:var(--font-body);
  font-weight:700;
  font-size:0.84rem;
  cursor:pointer;
}
.conv-mode button.active{
  background:var(--brass);
  border-color:var(--brass);
  color:var(--ink);
}
.conv-swap{
  width:40px;height:40px;border-radius:50%;
  border:1.5px solid var(--brass);
  background:transparent;color:var(--paper);
  font-size:1.1rem;cursor:pointer;
  align-self:center;
}
.conv-result{
  grid-column:1/-1;
  font-family:var(--font-data);
  font-size:1.5rem;
  font-weight:700;
  padding-top:14px;
  border-top:1px solid rgba(244,237,221,0.25);
}
.conv-result small{display:block;font-size:0.78rem;font-weight:500;color:var(--brass);margin-top:4px;}

/* ---------------- Explainer / FAQ ---------------- */
.two-col{
  display:grid;grid-template-columns:1fr 1fr;gap:30px;
}
@media (max-width:780px){.two-col{grid-template-columns:1fr;}}
.card{
  background:var(--chalk);
  border:1px solid var(--line);
  border-radius:8px;
  padding:22px 24px;
}
.card h3{
  font-family:var(--font-display);
  margin:0 0 10px;
  font-size:1.1rem;
}
.card p{margin:0;color:var(--slate);font-size:0.95rem;}

.faq-item{border-bottom:1px solid var(--line);padding:16px 0;}
.faq-item summary{
  font-family:var(--font-display);
  font-weight:700;
  cursor:pointer;
  font-size:1rem;
  list-style:none;
  display:flex;justify-content:space-between;gap:12px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.3rem;color:var(--brass-dark);}
.faq-item[open] summary::after{content:"–";}
.faq-item p{margin:10px 0 0;color:var(--slate);font-size:0.93rem;}

.disclaimer{
  font-size:0.82rem;
  color:var(--slate);
  opacity:0.8;
  border-top:1px dashed var(--line);
  padding-top:14px;
  margin-top:22px;
}

/* ---------------- Footer ---------------- */
.site-footer{
  border-top:3px solid var(--ink);
  background:var(--slate);
  color:var(--chalk);
  padding:34px 0 24px;
  position:relative;z-index:1;
}
.foot-grid{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;}
.foot-col h4{font-family:var(--font-display);font-size:0.9rem;margin:0 0 10px;color:var(--brass);}
.foot-col a{display:block;color:var(--chalk);text-decoration:none;font-size:0.88rem;opacity:0.85;margin-bottom:6px;}
.foot-bottom{
  margin-top:24px;padding-top:18px;border-top:1px solid rgba(244,237,221,0.15);
  font-size:0.78rem;opacity:0.7;
}

.visually-hidden{position:absolute;left:-9999px;}

.skip-link{
  position:absolute;left:-9999px;top:0;background:var(--ink);color:var(--paper);
  padding:10px 16px;z-index:100;
}
.skip-link:focus{left:10px;top:10px;}

:focus-visible{outline:3px solid var(--brass);outline-offset:2px;}

@media (prefers-reduced-motion: reduce){
  .dot-live, .skel{animation:none;}
}