/* ════════════════════════════════════════════════════════════════
   Islamic Banking Platform docs — heritage institution, Shariah-native.
   Ivory stock, deep emerald ink, antique gold, eight-point star motif.
   Same restraint as the Master Catalog: engraved, not animated.
   ════════════════════════════════════════════════════════════════ */
:root {
  --paper:   #f6f2e7;
  --paper-2: #ede7d4;
  --card:    #fbf8ef;
  --ink:     #1c352b;       /* deep emerald */
  --ink-2:   #455e51;
  --ink-3:   #76907f;
  --rule:    #cfc4a6;
  --gold:    #8d701f;
  --gold-2:  #b3933b;
  --wine:    #5e2233;
  --serif-d: "Marcellus", "Times New Roman", serif;
  --sans:    "Manrope", -apple-system, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, monospace;
  --maxw: 1100px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-size: 17px; line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
/* faint eight-point star lattice */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0; opacity: .045;
  background-image:
    radial-gradient(circle at center, transparent 9px, var(--ink) 9.5px, transparent 10.5px);
  background-size: 56px 56px;
}
main, header, footer { position: relative; z-index: 1; }
a { color: var(--ink); text-decoration-color: var(--gold); text-underline-offset: 3px; }
a:hover { color: var(--gold); }
code { font-family: var(--mono); font-size: .82em; color: var(--wine); }
h2 {
  font-family: var(--serif-d); font-weight: 400;
  font-size: clamp(1.7rem, 4.6vw, 2.6rem); letter-spacing: .01em;
  margin: 0 0 1rem; display: flex; gap: .8rem; align-items: baseline;
}
h2 .no { font-family: var(--mono); font-size: .75rem; color: var(--gold); border: 1px solid var(--gold); border-radius: 2px; padding: .14rem .45rem; letter-spacing: .1em; }
h3 { font-family: var(--serif-d); font-weight: 400; font-size: 1.3rem; margin: 0 0 .6rem; }
h3 small { color: var(--ink-3); font-family: var(--sans); font-size: .68em; margin-left: .5rem; }
.intro { color: var(--ink-2); max-width: 62ch; margin: 0 0 1.8rem; }

/* top bar */
.top {
  position: sticky; top: 0; z-index: 60;
  background: rgba(246,242,231,.94); backdrop-filter: blur(8px);
  border-bottom: 3px double var(--rule);
  display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap;
  padding: .7rem clamp(1rem, 4vw, 2.4rem);
}
.brand { font-family: var(--serif-d); font-size: .95rem; letter-spacing: .22em; color: var(--ink); text-decoration: none; }
.brand-star { color: var(--gold); }
.nav { display: flex; gap: clamp(.6rem, 1.6vw, 1.2rem); flex-wrap: wrap; margin-left: auto; }
.nav a { font-size: .76rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-2); text-decoration: none; }
.nav a:hover { color: var(--gold); }
.gh { font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; border: 1px solid var(--rule); border-radius: 2px; padding: .3rem .65rem; color: var(--ink); text-decoration: none; }
.gh:hover { border-color: var(--gold); color: var(--gold); }
@media (max-width: 1000px) { .nav { display: none; } }

/* hero */
.hero { max-width: var(--maxw); margin: 0 auto; text-align: center; padding: clamp(2.8rem, 8vw, 5rem) 1.2rem 2.6rem; }
.eyebrow { font-family: var(--mono); font-size: .72rem; letter-spacing: .22em; color: var(--gold); margin: 0 0 1.2rem; }
.hero h1 { font-family: var(--serif-d); font-weight: 400; font-size: clamp(2.4rem, 7.5vw, 4.8rem); line-height: 1.06; margin: 0 0 1.2rem; }
.accent { color: var(--gold); }
.hero-sub { max-width: 62ch; margin: 0 auto 2.4rem; color: var(--ink-2); font-size: clamp(1rem, 2.2vw, 1.15rem); }
.statline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.stat { background: var(--card); padding: 1.1rem .8rem; }
.stat b { display: block; font-family: var(--serif-d); font-size: clamp(1.6rem, 4vw, 2.3rem); color: var(--ink); }
.stat span { font-family: var(--mono); font-size: .62rem; letter-spacing: .04em; color: var(--ink-3); line-height: 1.45; }
@media (max-width: 760px) { .statline { grid-template-columns: repeat(2, 1fr); } }

/* bands */
.band { max-width: var(--maxw); margin: 0 auto; padding: clamp(2.4rem, 6vw, 4rem) clamp(1rem, 4vw, 2.2rem); border-top: 1px solid var(--rule); }
.band-alt { background: linear-gradient(var(--paper-2), var(--paper-2)); }

/* principles */
.prin-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: .8rem; margin-bottom: 1rem; }
.prin {
  text-align: left; cursor: pointer; background: var(--card);
  border: 1px solid var(--rule); border-radius: 2px; padding: 1.1rem 1.2rem; transition: border-color .15s;
  font-family: var(--sans);
}
.prin:hover, .prin.active { border-color: var(--gold); }
.prin.active { background: var(--paper-2); box-shadow: inset 0 3px 0 var(--gold); }
.prin h3 { font-size: 1.05rem; margin-bottom: .4rem; }
.prin p { margin: 0; font-size: .85rem; color: var(--ink-2); }
.prin-detail {
  background: var(--card); border: 1px solid var(--rule); border-left: 3px solid var(--gold);
  border-radius: 2px; padding: 1.2rem 1.4rem; min-height: 90px; font-size: .95rem; color: var(--ink-2);
}
.prin-detail b { color: var(--ink); }
.prin-detail a { font-family: var(--mono); font-size: .82em; }

/* mapper */
.mapper { display: grid; grid-template-columns: 280px 1fr; gap: 1.2rem; align-items: start; }
@media (max-width: 820px) { .mapper { grid-template-columns: 1fr; } }
.mapper-buttons { display: flex; flex-direction: column; gap: .45rem; }
.mapbtn {
  text-align: left; cursor: pointer; font-family: var(--sans); font-size: .92rem;
  background: var(--card); color: var(--ink-2); border: 1px solid var(--rule); border-radius: 2px;
  padding: .7rem .95rem; transition: .15s;
}
.mapbtn:hover { border-color: var(--gold); color: var(--ink); }
.mapbtn.active { border-color: var(--gold); background: var(--paper-2); color: var(--ink); box-shadow: inset 3px 0 0 var(--gold); }
.mapper-out {
  background: var(--card); border: 1px solid var(--rule); border-radius: 2px;
  padding: 1.4rem 1.5rem; position: sticky; top: 86px;
}
.map-arrow { font-family: var(--serif-d); font-size: 1.3rem; margin: 0 0 .6rem; }
.map-arrow .from { color: var(--wine); text-decoration: line-through; text-decoration-thickness: 1px; }
.map-arrow .to { color: var(--ink); }
.mapper-out h4 { font-family: var(--serif-d); font-weight: 400; font-size: 1.2rem; margin: 0 0 .5rem; }
.mapper-out p, .mapper-out li { color: var(--ink-2); font-size: .93rem; }
.mapper-out ul { padding-left: 1.15rem; margin: .4rem 0 .8rem; }
.map-repo { font-family: var(--mono); font-size: .78rem; }

/* explorer */
.explorer-controls { display: flex; gap: .6rem; flex-wrap: wrap; margin-bottom: .5rem; }
.explorer-controls input, .explorer-controls select {
  font-family: var(--sans); font-size: .9rem; color: var(--ink);
  background: var(--card); border: 1px solid var(--rule); border-radius: 2px; padding: .55rem .8rem;
}
.explorer-controls input { flex: 1; min-width: 240px; }
.ex-count { font-family: var(--mono); font-size: .72rem; color: var(--ink-3); margin: 0 0 .6rem; }
.ex-table-wrap { border: 1px solid var(--rule); border-radius: 2px; overflow: auto; max-height: 520px; background: var(--card); }
.ex-table { width: 100%; border-collapse: collapse; font-size: .86rem; }
.ex-table th {
  position: sticky; top: 0; background: var(--ink); color: var(--paper);
  font-family: var(--serif-d); font-weight: 400; letter-spacing: .12em; text-transform: uppercase; font-size: .68rem;
  text-align: left; padding: .7rem .9rem;
}
.ex-table td { padding: .55rem .9rem; border-bottom: 1px solid var(--paper-2); vertical-align: top; }
.ex-table tbody tr:hover { background: var(--paper-2); }
.sd-name { font-family: var(--serif-d); font-size: 1.02rem; }
.dim { color: var(--ink-3); font-size: .78rem; }
.repo-link { font-family: var(--mono); font-size: .74rem; }

/* calculators */
.calc { background: var(--card); border: 1px solid var(--rule); border-radius: 2px; padding: 1.4rem 1.5rem; margin-bottom: 1.2rem; }
.calc > p { color: var(--ink-2); font-size: .93rem; max-width: 75ch; }
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.4rem; align-items: start; margin-top: .8rem; }
@media (max-width: 760px) { .calc-grid { grid-template-columns: 1fr; } }
.calc-in label { display: block; font-size: .85rem; color: var(--ink-2); margin-bottom: .8rem; }
.calc-in input {
  display: block; width: 100%; margin-top: .3rem; font-family: var(--mono); font-size: .95rem;
  color: var(--ink); background: var(--paper); border: 1px solid var(--rule); border-radius: 2px; padding: .5rem .7rem;
}
.calc-in input:focus { outline: none; border-color: var(--gold); }
.calc-out {
  background: var(--ink); color: var(--paper); border-radius: 2px; padding: 1.2rem 1.3rem;
  font-family: var(--mono); font-size: .82rem;
}
.calc-out .big { font-family: var(--serif-d); font-size: 2rem; color: var(--gold-2); display: block; margin: .2rem 0 .6rem; }
.calc-out .row { display: flex; justify-content: space-between; border-bottom: 1px dotted rgba(246,242,231,.25); padding: .3rem 0; color: #cfd8cf; }
.calc-out .note { margin-top: .8rem; font-family: var(--sans); font-style: italic; font-size: .8rem; color: #a8b8aa; }

/* isolation */
.iso-table-wrap { border: 1px solid var(--rule); border-radius: 2px; overflow-x: auto; background: var(--card); }
.iso-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.iso-table th { background: var(--ink); color: var(--paper); font-family: var(--serif-d); font-weight: 400; letter-spacing: .1em; padding: .7rem 1rem; text-align: left; }
.iso-table td { padding: .65rem 1rem; border-bottom: 1px solid var(--paper-2); }
.iso-table td:first-child { font-family: var(--serif-d); }

/* run */
.run-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 760px) { .run-grid { grid-template-columns: 1fr; } }
.run-card { background: var(--card); border: 1px solid var(--rule); border-radius: 2px; padding: 1.1rem 1.2rem; }
.run-card h3 { font-size: 1.05rem; }
.run-quality { font-size: .9rem; color: var(--ink-2); }
pre {
  position: relative; background: var(--ink); color: #e9efe7;
  border-radius: 2px; border-left: 3px solid var(--gold);
  padding: .9rem 1rem; overflow-x: auto;
  font-family: var(--mono); font-size: .74rem; line-height: 1.55; margin: 0;
}
pre code { color: inherit; font-size: 1em; }
.copy-btn {
  position: absolute; top: .45rem; right: .45rem; cursor: pointer;
  font-family: var(--mono); font-size: .62rem; color: #cfd8cf;
  background: transparent; border: 1px solid rgba(246,242,231,.3); border-radius: 2px; padding: .2rem .5rem;
}
.copy-btn:hover { color: var(--gold-2); border-color: var(--gold-2); }

/* footer */
.foot { max-width: var(--maxw); margin: 0 auto; padding: 2.4rem 1.2rem 3.4rem; border-top: 3px double var(--rule); text-align: center; color: var(--ink-2); font-size: .9rem; }
.foot-dim { color: var(--ink-3); font-size: .78rem; font-style: italic; }

/* faq */
.faq { max-width: 74ch; }
.faq details { border: 1px solid var(--rule); border-left: 3px solid var(--gold); background: var(--card); border-radius: 2px; margin-bottom: .7rem; }
.faq summary { list-style: none; cursor: pointer; position: relative; padding: .95rem 2.6rem .95rem 1.1rem; font-family: var(--serif-d); font-size: 1.16rem; color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); font-family: var(--mono); color: var(--gold); font-size: 1.3rem; }
.faq details[open] summary::after { content: "\2013"; }
.faq summary:hover { color: var(--wine); }
.faq .ans { padding: 0 1.1rem 1.1rem; color: var(--ink-2); line-height: 1.72; max-width: 70ch; }
.faq .ans strong { color: var(--ink); font-weight: 600; }

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