/* ============================================================
   NISAAB — Pakistan Salary Tax Calculator
   Design language: the government "challan" / bank passbook —
   ledger paper, brass seals, tabular ink numerals, perforated
   receipt edges. Progressive tax is shown literally, as a
   staircase of brackets a rupee climbs.
   ============================================================ */

:root{
  --bg:            #EEF0E7;   /* pale ledger-paper sage */
  --bg-alt:        #E4E8DC;
  --surface:       #FFFFFF;
  --surface-line:  #D9DED0;
  --ink:           #17221C;   /* near-black green-ink */
  --ink-soft:      #4B564D;
  --muted:         #6E7A6E;
  --primary:       #0B4F45;   /* deep pine teal */
  --primary-dark:  #082F29;
  --primary-tint:  #E4EEEA;
  --gold:          #C08A2E;   /* brass / currency-foil gold */
  --gold-light:    #F1D89A;
  --gold-dark:     #8F6416;
  --coral:         #B4553B;   /* stamp-ink red, used sparingly */
  --line:          #CBD2C2;
  --radius-sm:     6px;
  --radius:        10px;
  --radius-lg:     18px;
  --shadow-card:   0 1px 2px rgba(23,34,28,0.06), 0 12px 28px -12px rgba(23,34,28,0.18);
  --shadow-soft:   0 1px 2px rgba(23,34,28,0.05);
  --font-display:  "Fraunces", "Georgia", serif;
  --font-body:     "IBM Plex Sans", -apple-system, Segoe UI, sans-serif;
  --font-mono:     "IBM Plex Mono", "Courier New", monospace;
}

*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection{ background: var(--gold-light); color: var(--primary-dark); }

a{ color: inherit; text-decoration: none; }

h1,h2,h3,h4{
  font-family: var(--font-display);
  color: var(--primary-dark);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

.figure, .num, .money{
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-dark);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before{
  content: "";
  width: 20px; height: 1px;
  background: var(--gold-dark);
  display: inline-block;
}

.container-narrow{ max-width: 960px; margin: 0 auto; }

/* ---------- Buttons ---------- */
.btn{
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 999px;
  padding: 0.75rem 1.6rem;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.btn:active{ transform: translateY(1px); }

.btn-brass{
  background: var(--gold);
  color: var(--primary-dark);
  box-shadow: var(--shadow-soft);
}
.btn-brass:hover{ background: var(--gold-dark); color: #fff; }

.btn-pine{
  background: var(--primary);
  color: #fff;
}
.btn-pine:hover{ background: var(--primary-dark); color: #fff; }

.btn-outline-pine{
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline-pine:hover{ background: var(--primary); color: #fff; }

.btn-ghost{
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover{ background: var(--surface); border-color: var(--primary); }

.btn-block{ width: 100%; justify-content: center; }

/* ---------- Navbar ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(238,240,231,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.navbar-nisaab{ padding: 0.9rem 0; }
.brand{
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  color: var(--primary-dark);
}
.brand-mark{
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--gold-light);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  flex-shrink: 0;
}
.brand-tag{
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-transform: uppercase;
  display: block;
  margin-top: -2px;
}
.nav-link-nisaab{
  font-weight: 500;
  color: var(--ink-soft) !important;
  margin: 0 0.5rem;
  padding: 0.4rem 0.2rem !important;
  border-bottom: 2px solid transparent;
}
.nav-link-nisaab.active, .nav-link-nisaab:hover{
  color: var(--primary-dark) !important;
  border-bottom-color: var(--gold);
}

/* ---------- Hero ---------- */
.hero{
  padding: 4rem 0 3rem;
  position: relative;
  overflow: hidden;
}
.hero::before{
  content:"";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 85% 8%, rgba(192,138,46,0.14), transparent 45%),
    radial-gradient(circle at 5% 90%, rgba(11,79,69,0.10), transparent 40%);
  pointer-events: none;
}
.hero h1{
  font-size: clamp(2.1rem, 4vw, 3.1rem);
  line-height: 1.08;
}
.hero .lede{
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 46ch;
}
.hero-stats{
  display: flex; gap: 1.6rem; flex-wrap: wrap; margin-top: 1.6rem;
}
.hero-stat .num{ font-size: 1.4rem; color: var(--primary-dark); font-weight: 600; display:block; }
.hero-stat .label{ font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em;}

/* ---------- Calculator "challan" card ---------- */
.challan{
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  position: relative;
  border: 1px solid var(--surface-line);
}
.challan-top{
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: 1.1rem 1.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.challan-top .title{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
}
.challan-top .fy-badge{
  font-family: var(--font-mono);
  background: rgba(255,255,255,0.14);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
}
.challan-body{ padding: 1.6rem; }

/* perforated edge between input side and result side */
.perforation{
  border-left: 2px dashed var(--line);
  position: relative;
}
.perforation::before, .perforation::after{
  content:"";
  position: absolute;
  left: -8px;
  width: 16px; height: 16px;
  background: var(--bg);
  border-radius: 50%;
  border: 1px solid var(--line);
}
.perforation::before{ top: -8px; }
.perforation::after{ bottom: -8px; }

.form-label-nisaab{
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
}
.form-control-nisaab, .form-select-nisaab{
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  background: var(--bg-alt);
  width: 100%;
}
.form-control-nisaab:focus, .form-select-nisaab:focus{
  outline: none;
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px var(--primary-tint);
}
.input-prefix{
  position: relative;
}
.input-prefix .rs{
  position: absolute; left: 0.8rem; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); color: var(--muted); font-size: 0.95rem;
}
.input-prefix .form-control-nisaab{ padding-left: 2.6rem; }

.result-line{
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 0.55rem 0;
  border-bottom: 1px dotted var(--line);
}
.result-line:last-child{ border-bottom: none; }
.result-line .label{ color: var(--ink-soft); font-size: 0.9rem; }
.result-line .value{ font-weight: 600; font-size: 1.05rem; }
.result-line.big .value{ font-size: 1.7rem; color: var(--primary-dark); }
.result-line.tax .value{ color: var(--coral); }
.result-line.net .value{ color: var(--primary); }

.rate-pill{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--gold-light);
  color: var(--gold-dark);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
}

/* ---------- Staircase signature visual ---------- */
.stair-wrap{
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1rem 0.6rem;
}
.stair-caption{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}
.step-rect{ fill: var(--surface); stroke: var(--line); stroke-width: 1; transition: fill .25s ease, stroke .25s ease; }
.step-rect.active{ fill: var(--gold); stroke: var(--gold-dark); }
.step-label{ font-family: var(--font-mono); font-size: 9px; fill: var(--ink-soft); }
.step-label.active{ fill: var(--primary-dark); font-weight: 700; }
.coin{ transition: transform .35s cubic-bezier(.22,1,.36,1); }

/* ---------- Sections / cards ---------- */
.section{ padding: 4.5rem 0; }
.section-tight{ padding: 3rem 0; }
.section-alt{ background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head{ max-width: 640px; margin-bottom: 2.5rem; }
.section-head h2{ font-size: clamp(1.6rem, 3vw, 2.2rem); margin-top: 0.5rem; }
.section-head p{ color: var(--ink-soft); margin-top: 0.7rem; }

.card-nisaab{
  background: var(--surface);
  border: 1px solid var(--surface-line);
  border-radius: var(--radius);
  padding: 1.7rem;
  height: 100%;
  box-shadow: var(--shadow-soft);
  transition: box-shadow .2s ease, transform .2s ease;
}
.card-nisaab:hover{ box-shadow: var(--shadow-card); transform: translateY(-3px); }
.card-icon{
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--primary-tint);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}
.card-nisaab h3{ font-size: 1.15rem; margin-bottom: 0.5rem; }
.card-nisaab p{ color: var(--ink-soft); font-size: 0.94rem; margin: 0; }

.stamp{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--gold-dark);
  border: 1px solid var(--gold);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  text-transform: uppercase;
}

/* how it works */
.step-item{ display:flex; gap: 1rem; }
.step-num{
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--gold);
  flex-shrink: 0;
  width: 44px;
}
.step-item h4{ font-size: 1.05rem; margin-bottom: 0.3rem; }
.step-item p{ color: var(--ink-soft); font-size: 0.92rem; margin: 0; }

/* FAQ */
.accordion-nisaab .accordion-item{ background: transparent; border: none; border-bottom: 1px solid var(--line); border-radius: 0; }
.accordion-nisaab .accordion-button{
  background: transparent; font-family: var(--font-display); font-weight: 600; color: var(--primary-dark);
  padding: 1.1rem 0; box-shadow: none;
}
.accordion-nisaab .accordion-button:not(.collapsed){ color: var(--primary); background: transparent; }
.accordion-nisaab .accordion-button::after{ filter: sepia(1) saturate(3) hue-rotate(-20deg); }
.accordion-nisaab .accordion-body{ padding: 0 0 1.2rem; color: var(--ink-soft); }

/* ---------- Footer ---------- */
.site-footer{
  background: var(--primary-dark);
  color: #DCE7E1;
  padding: 3.5rem 0 1.5rem;
}
.site-footer a{ color: #C9DAD2; }
.site-footer a:hover{ color: var(--gold-light); }
.site-footer h5{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold-light);
  margin-bottom: 1rem;
}
.footer-bottom{
  border-top: 1px solid rgba(255,255,255,0.12);
  margin-top: 2.5rem;
  padding-top: 1.3rem;
  font-size: 0.82rem;
  color: #9FB3AA;
}
.footer-brand{ font-family: var(--font-display); font-size: 1.3rem; color: #fff; }
.disclaimer-note{
  font-size: 0.78rem;
  color: #9FB3AA;
  max-width: 60ch;
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.page-hero h1{ font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
.page-hero .lede{ color: var(--ink-soft); max-width: 58ch; margin-top: 0.6rem; }

/* legal pages */
.legal-content h2{ font-size: 1.25rem; margin-top: 2.2rem; margin-bottom: 0.7rem; }
.legal-content h2:first-child{ margin-top: 0; }
.legal-content p, .legal-content li{ color: var(--ink-soft); font-size: 0.97rem; }
.legal-content ul{ padding-left: 1.2rem; }
.legal-updated{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--gold-dark);
  background: var(--gold-light);
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.legal-toc{
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--line);
}
.legal-toc a{ display:block; padding: 0.25rem 0; color: var(--primary); font-size: 0.92rem; }
.legal-toc a:hover{ color: var(--gold-dark); }

/* ---------- Blog ---------- */
.blog-card img, .blog-card .thumb{ border-radius: var(--radius) var(--radius) 0 0; }
.blog-thumb{
  height: 160px;
  border-radius: var(--radius) var(--radius) 0 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex; align-items: center; justify-content: center;
  color: var(--gold-light);
  font-family: var(--font-display);
  font-size: 2.2rem;
  position: relative;
  overflow: hidden;
}
.blog-thumb .cat{
  position: absolute; top: 0.8rem; left: 0.8rem;
  font-family: var(--font-mono); font-size: 0.65rem; text-transform: uppercase;
  background: rgba(255,255,255,0.16); color: #fff; padding: 0.2rem 0.6rem; border-radius: 999px;
}
.blog-card{ padding: 0; overflow: hidden; }
.blog-card .body{ padding: 1.4rem; }
.blog-meta{ font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.blog-card h3{ font-size: 1.08rem; margin: 0.5rem 0; }
.blog-card p{ color: var(--ink-soft); font-size: 0.9rem; }
.read-more{ font-weight: 600; color: var(--primary); font-size: 0.88rem; }
.read-more:hover{ color: var(--gold-dark); }

.article-body h2{ font-family: var(--font-display); font-size: 1.4rem; margin-top: 2rem; color: var(--primary-dark); }
.article-body p, .article-body li{ color: var(--ink-soft); font-size: 1.02rem; line-height: 1.75; }
.article-body ul{ padding-left: 1.3rem; }
.article-body blockquote{
  border-left: 3px solid var(--gold);
  padding-left: 1.1rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--primary-dark);
  margin: 1.6rem 0;
}

/* ---------- Table (slab breakdown) ---------- */
.table-nisaab{ width: 100%; font-size: 0.9rem; }
.table-nisaab th{
  font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--muted); border-bottom: 1px solid var(--line); padding: 0.5rem 0.6rem; text-align: left;
}
.table-nisaab td{ padding: 0.55rem 0.6rem; border-bottom: 1px solid var(--line); font-family: var(--font-mono); }
.table-nisaab tr.active-row td{ background: var(--gold-light); }

/* misc */
.badge-soft{ background: var(--primary-tint); color: var(--primary); border-radius: 999px; padding: 0.25rem 0.7rem; font-size: 0.78rem; font-weight: 600;}
.text-muted-nisaab{ color: var(--muted); }
.hr-dashed{ border: none; border-top: 1px dashed var(--line); margin: 1.6rem 0; }

@media (max-width: 991px){
  .perforation{ border-left: none; border-top: 2px dashed var(--line); padding-top: 1.6rem; margin-top: 1.6rem; }
  .perforation::before, .perforation::after{ left: 50%; top: -8px; transform: translateX(-50%); }
  .perforation::after{ top: auto; bottom: -8px; }
}

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