/* =========================================================
   GST Calculator India — Design System
   A ledger/receipt-inspired financial tool aesthetic.
   ========================================================= */

:root{
  /* Color */
  --bg:        #F4F7F5;
  --surface:   #FFFFFF;
  --ink:       #122A3D;
  --ink-soft:  #55697A;
  --ink-faint: #8496A3;
  --navy:      #122A3D;
  --green:     #1B7A4D;
  --green-dark:#145E3B;
  --gold:      #B8862E;
  --line:      #DCE4DF;
  --line-strong: #C3CFC8;
  --danger:    #B3261E;
  --danger-bg: #FBEAE8;
  --focus:     #1B7A4D;

  /* Type */
  --font-head: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* Layout */
  --maxw: 1120px;
  --radius-s: 6px;
  --radius-m: 10px;
  --shadow-card: 0 1px 2px rgba(18,42,61,.06), 0 8px 24px -12px rgba(18,42,61,.18);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--ink);
  line-height:1.55;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:var(--green-dark); text-decoration:none; }
a:hover{ text-decoration:underline; }
h1,h2,h3,h4{
  font-family:var(--font-head);
  color:var(--navy);
  line-height:1.2;
  margin:0 0 .5em;
  font-weight:700;
}
h1{ font-size:clamp(1.9rem,4vw,2.8rem); }
h2{ font-size:clamp(1.4rem,3vw,1.9rem); }
h3{ font-size:1.15rem; }
p{ margin:0 0 1em; color:var(--ink-soft); max-width:70ch; }
ul{ margin:0 0 1em; padding-left:1.2em; color:var(--ink-soft); }
li{ margin-bottom:.35em; }
.container{ max-width:var(--maxw); margin:0 auto; padding:0 20px; }
section{ padding:56px 0; }
.section-tight{ padding:36px 0; }

:focus-visible{
  outline:3px solid var(--focus);
  outline-offset:2px;
}
.visually-hidden{
  position:absolute; width:1px; height:1px; margin:-1px; padding:0;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
.skip-link{
  position:absolute; left:-999px; top:0; background:var(--navy); color:#fff;
  padding:10px 16px; z-index:200; border-radius:0 0 6px 0;
}
.skip-link:focus{ left:0; }

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:100;
  background:var(--navy);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  height:64px;
}
.brand{ display:flex; align-items:center; gap:10px; color:#fff; font-family:var(--font-head); font-size:1.15rem; font-weight:700; }
.brand:hover{ text-decoration:none; }
.brand svg{ flex:none; }
.brand .brand-sub{ display:block; font-family:var(--font-body); font-weight:400; font-size:.68rem; color:#B9D6C6; letter-spacing:.02em; }

.main-nav{ display:none; }
.main-nav ul{ list-style:none; display:flex; gap:26px; margin:0; padding:0; }
.main-nav a{ color:#DCE7E1; font-size:.95rem; }
.main-nav a:hover{ color:#fff; }

.header-actions{ display:flex; align-items:center; gap:10px; }
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  border:none; border-radius:var(--radius-s); cursor:pointer;
  font-family:var(--font-body); font-size:.95rem; font-weight:600;
  padding:12px 18px; min-height:48px; line-height:1;
  transition:transform .06s ease, background-color .15s ease;
}
.btn:active{ transform:translateY(1px); }
.btn-primary{ background:var(--green); color:#fff; }
.btn-primary:hover{ background:var(--green-dark); text-decoration:none; }
.btn-outline{ background:transparent; color:var(--navy); border:1.5px solid var(--line-strong); }
.btn-outline:hover{ background:#EEF3F0; text-decoration:none; }
.btn-ghost{ background:transparent; color:#DCE7E1; border:1.5px solid rgba(255,255,255,.25); }
.btn-ghost:hover{ background:rgba(255,255,255,.08); color:#fff; text-decoration:none; }
.btn-sm{ min-height:40px; padding:8px 14px; font-size:.85rem; }
.btn:disabled{ opacity:.5; cursor:not-allowed; }

.nav-toggle{
  display:inline-flex; background:transparent; border:none; color:#fff;
  width:48px; height:48px; align-items:center; justify-content:center; cursor:pointer;
}
.nav-toggle svg{ pointer-events:none; }

.mobile-nav{
  display:none;
  background:var(--navy); border-top:1px solid rgba(255,255,255,.08);
}
.mobile-nav.open{ display:block; }
.mobile-nav ul{ list-style:none; margin:0; padding:8px 0; }
.mobile-nav a{
  display:block; padding:14px 20px; color:#EDF3EF; font-size:1rem;
  min-height:48px; display:flex; align-items:center;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.mobile-nav a:hover{ background:rgba(255,255,255,.06); text-decoration:none; }
.mobile-cta{ padding:14px 20px 20px; }
.mobile-cta .btn{ width:100%; }

@media (min-width:900px){
  .main-nav{ display:block; }
  .nav-toggle{ display:none; }
  .mobile-nav{ display:none !important; }
}

/* ---------- Breadcrumb ---------- */
.breadcrumb{ font-size:.85rem; color:var(--ink-faint); padding:14px 0 0; }
.breadcrumb ol{ list-style:none; display:flex; flex-wrap:wrap; gap:6px; margin:0; padding:0; }
.breadcrumb a{ color:var(--ink-faint); }
.breadcrumb li:not(:last-child)::after{ content:"/"; margin-left:6px; color:var(--line-strong); }
.breadcrumb li:last-child{ color:var(--ink-soft); }

/* ---------- Hero ---------- */
.hero{ padding:44px 0 12px; }
.hero-grid{
  display:grid; gap:36px; align-items:start;
}
.hero-eyebrow-free{ display:inline-block; background:#E8F3EC; color:var(--green-dark); font-size:.8rem; font-weight:600; padding:5px 12px; border-radius:999px; margin-bottom:14px; }
.hero h1{ margin-bottom:.3em; }
.hero .lede{ font-size:1.08rem; max-width:52ch; }
.hero-notes{ display:flex; flex-wrap:wrap; gap:18px; margin-top:18px; padding:0; list-style:none; }
.hero-notes li{ font-size:.88rem; color:var(--ink-soft); display:flex; align-items:center; gap:6px; margin:0; }
.hero-notes svg{ flex:none; color:var(--green); }

@media (min-width:960px){
  .hero-grid{ grid-template-columns:1fr 1fr; }
}

/* ---------- Receipt calculator ---------- */
.receipt{
  background:var(--surface);
  border-radius:var(--radius-m);
  box-shadow:var(--shadow-card);
  padding:26px 24px 22px;
  position:relative;
  border:1px solid var(--line);
}
.receipt::before{
  content:"";
  position:absolute; left:0; right:0; top:-9px; height:18px;
  background-image:radial-gradient(circle at 9px 9px, var(--bg) 9px, transparent 9.5px);
  background-size:18px 18px;
  background-position:left top;
}
.receipt-head{ text-align:center; margin-bottom:18px; }
.receipt-head .kicker{ font-size:.72rem; letter-spacing:.06em; color:var(--ink-faint); }
.receipt-head h2{ margin:2px 0 0; font-size:1.3rem; }

.field{ margin-bottom:18px; }
.field label{ display:block; font-size:.85rem; font-weight:600; color:var(--ink); margin-bottom:6px; }
.amount-input-wrap{
  display:flex; align-items:center; border:1.5px solid var(--line-strong);
  border-radius:var(--radius-s); background:#FBFCFB; overflow:hidden;
}
.amount-input-wrap:focus-within{ border-color:var(--green); background:#fff; }
.amount-input-wrap .rupee{ padding:0 4px 0 14px; font-size:1.3rem; color:var(--ink-soft); font-family:var(--font-head); }
.amount-input-wrap input{
  flex:1; border:none; background:transparent; padding:14px 14px 14px 4px;
  font-size:1.4rem; font-variant-numeric:tabular-nums; color:var(--navy); min-height:48px;
  font-family:var(--font-body); font-weight:600;
}
.amount-input-wrap input:focus{ outline:none; }
.field-hint{ font-size:.78rem; color:var(--ink-faint); margin-top:6px; }
.field-error{ font-size:.82rem; color:var(--danger); margin-top:6px; display:none; }
.field-error.show{ display:block; }
.amount-input-wrap.has-error{ border-color:var(--danger); background:var(--danger-bg); }

.rate-group{ display:flex; flex-wrap:wrap; gap:8px; }
.rate-btn{
  min-height:44px; padding:0 16px; border-radius:999px; border:1.5px solid var(--line-strong);
  background:#fff; color:var(--ink); font-weight:600; font-size:.92rem; cursor:pointer;
  font-family:var(--font-body);
}
.rate-btn:hover{ border-color:var(--green); }
.rate-btn.active{ background:var(--navy); border-color:var(--navy); color:#fff; }
.rate-custom-wrap{ display:flex; align-items:center; gap:8px; margin-top:10px; }
.rate-custom-wrap input{
  width:90px; padding:10px 10px; border-radius:var(--radius-s); border:1.5px solid var(--line-strong);
  font-size:1rem; font-variant-numeric:tabular-nums;
}
.rate-custom-wrap.hidden{ display:none; }

.mode-toggle{ display:flex; border-radius:999px; background:#EEF2EF; padding:4px; gap:4px; }
.mode-toggle button{
  flex:1; border:none; background:transparent; padding:11px 10px; border-radius:999px;
  font-weight:600; font-size:.9rem; color:var(--ink-soft); cursor:pointer; min-height:44px;
  font-family:var(--font-body);
}
.mode-toggle button.active{ background:#fff; color:var(--navy); box-shadow:0 1px 3px rgba(18,42,61,.15); }

.gst-type-toggle{ display:flex; gap:16px; margin-top:4px; }
.gst-type-toggle label{ display:flex; align-items:center; gap:6px; font-size:.88rem; color:var(--ink-soft); font-weight:500; }

.result{
  margin-top:20px; border-top:1.5px dashed var(--line-strong); padding-top:16px;
}
.result-row{
  display:flex; justify-content:space-between; padding:6px 0; font-size:.95rem; color:var(--ink-soft);
}
.result-row .val{ font-variant-numeric:tabular-nums; font-weight:600; color:var(--ink); }
.result-row.total{
  border-top:1.5px dashed var(--line-strong); margin-top:8px; padding-top:14px;
  font-size:1.15rem; color:var(--navy); font-weight:700;
}
.result-row.total .val{ font-size:1.35rem; color:var(--green-dark); }

.result-actions{ display:flex; flex-wrap:wrap; gap:10px; margin-top:18px; }
.result-actions .btn{ flex:1; min-width:120px; }

.calc-actions{ display:flex; gap:10px; margin-top:8px; }
.calc-actions .btn{ flex:1; }

.copy-toast{
  position:fixed; left:50%; bottom:24px; transform:translateX(-50%) translateY(20px);
  background:var(--navy); color:#fff; padding:12px 20px; border-radius:999px;
  font-size:.9rem; opacity:0; pointer-events:none; transition:all .2s ease; z-index:300;
}
.copy-toast.show{ opacity:1; transform:translateX(-50%) translateY(0); }

/* ---------- Quick rate buttons section ---------- */
.quick-rates{ display:grid; grid-template-columns:repeat(2,1fr); gap:12px; }
@media (min-width:640px){ .quick-rates{ grid-template-columns:repeat(4,1fr); } }
.quick-rate-card{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-m);
  padding:18px; text-align:center; box-shadow:var(--shadow-card);
}
.quick-rate-card .pct{ font-family:var(--font-head); font-size:1.8rem; color:var(--green-dark); display:block; }
.quick-rate-card p{ margin:6px 0 12px; font-size:.85rem; }

/* ---------- Tool list (ledger style, not identical cards) ---------- */
.tool-ledger{ border-top:1px solid var(--line); }
.tool-row{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding:16px 4px; border-bottom:1px solid var(--line);
}
.tool-row .tool-name{ font-weight:700; color:var(--navy); font-family:var(--font-head); font-size:1.05rem; }
.tool-row .tool-desc{ margin:2px 0 0; font-size:.88rem; color:var(--ink-soft); }
.tool-row a.tool-link{ white-space:nowrap; font-weight:600; }

.two-col{ display:grid; gap:40px; }
@media (min-width:900px){ .two-col{ grid-template-columns:1.3fr .9fr; } }

/* ---------- Table ---------- */
.table-wrap{ overflow-x:auto; border:1px solid var(--line); border-radius:var(--radius-m); background:var(--surface); }
table{ border-collapse:collapse; width:100%; min-width:480px; }
th,td{ padding:12px 16px; text-align:right; font-size:.92rem; border-bottom:1px solid var(--line); font-variant-numeric:tabular-nums; }
th:first-child,td:first-child{ text-align:left; font-variant-numeric:normal; }
thead th{ background:#EEF3F0; color:var(--navy); font-family:var(--font-head); font-weight:700; }
tbody tr:last-child td{ border-bottom:none; }

/* ---------- FAQ ---------- */
.faq-item{ border-bottom:1px solid var(--line); }
.faq-item:first-child{ border-top:1px solid var(--line); }
.faq-q{
  width:100%; text-align:left; background:none; border:none; padding:18px 4px;
  font-family:var(--font-head); font-size:1.02rem; color:var(--navy); font-weight:700;
  cursor:pointer; display:flex; justify-content:space-between; align-items:center; gap:12px;
}
.faq-q .icon{ flex:none; transition:transform .15s ease; color:var(--green); }
.faq-q[aria-expanded="true"] .icon{ transform:rotate(45deg); }
.faq-a{ display:none; padding:0 4px 18px; }
.faq-a.open{ display:block; }

/* ---------- Cards / info blocks ---------- */
.info-card{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-m);
  padding:22px; box-shadow:var(--shadow-card);
}
.callout{
  background:#FBF6E9; border:1px solid #E7D8AE; border-left:4px solid var(--gold);
  padding:16px 18px; border-radius:var(--radius-s); font-size:.9rem; color:#5C4A1C;
}
.callout p{ color:#5C4A1C; margin:0; }
.callout strong{ color:#463610; }

/* ---------- Invoice ---------- */
.invoice-table-wrap{ overflow-x:auto; }
.invoice-table{ width:100%; border-collapse:collapse; min-width:760px; }
.invoice-table th{ background:#EEF3F0; padding:10px; font-size:.78rem; text-transform:none; text-align:left; border-bottom:2px solid var(--line-strong); }
.invoice-table td{ padding:8px; border-bottom:1px solid var(--line); text-align:left; }
.invoice-table input{
  width:100%; border:1.5px solid var(--line-strong); border-radius:6px; padding:9px 10px;
  font-size:.92rem; font-variant-numeric:tabular-nums; min-height:44px;
}
.invoice-table select{ width:100%; border:1.5px solid var(--line-strong); border-radius:6px; padding:9px; min-height:44px; font-size:.92rem;}
.invoice-table .line-total{ font-weight:700; font-variant-numeric:tabular-nums; white-space:nowrap; }
.invoice-table .rm-row{ background:transparent; border:1.5px solid var(--line-strong); border-radius:6px; width:36px; height:36px; cursor:pointer; color:var(--danger); font-weight:700; }
.invoice-summary{ max-width:340px; margin-left:auto; margin-top:20px; }

/* ---------- Footer ---------- */
.site-footer{ background:var(--navy); color:#C7D4CC; margin-top:60px; padding-top:48px; }
.footer-grid{ display:grid; gap:32px; grid-template-columns:1fr; }
@media (min-width:700px){ .footer-grid{ grid-template-columns:1.2fr repeat(4,1fr); } }
.footer-grid h4{ color:#fff; font-size:.85rem; text-transform:uppercase; letter-spacing:.06em; font-family:var(--font-body); margin-bottom:14px; }
.footer-grid ul{ list-style:none; padding:0; margin:0; }
.footer-grid li{ margin-bottom:9px; }
.footer-grid a{ color:#B9C7BE; font-size:.9rem; }
.footer-grid a:hover{ color:#fff; }
.footer-brand p{ color:#9FB0A6; font-size:.88rem; max-width:36ch; }
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12); margin-top:36px; padding:20px 0;
  display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between; font-size:.82rem; color:#8FA096;
}
.footer-disclaimer{ font-size:.78rem; color:#7F927C; max-width:900px; margin-top:8px; }

/* ---------- Ad container ---------- */
.ad-container{
  max-width:var(--maxw); margin:0 auto; padding:0 20px;
}
.ad-container .ad-slot{
  border:1px dashed var(--line-strong); border-radius:var(--radius-s);
  min-height:90px; display:flex; align-items:center; justify-content:center;
  color:var(--ink-faint); font-size:.78rem; background:#EEF2EF;
}

/* ---------- Utility ---------- */
.text-center{ text-align:center; }
.mt-0{ margin-top:0; }
.section-head{ max-width:640px; margin:0 auto 32px; text-align:center; }
.section-head.left{ text-align:left; margin:0 0 28px; }
.grid-3{ display:grid; gap:20px; grid-template-columns:1fr; }
@media (min-width:760px){ .grid-3{ grid-template-columns:repeat(3,1fr); } }
.related-links ul{ columns:2; column-gap:24px; }
@media (max-width:520px){ .related-links ul{ columns:1; } }
.bg-alt{ background:#EEF3F0; }
.page-hero{ padding:40px 0 8px; }
.page-hero p.lede{ font-size:1.05rem; }

/* Print */
@media print{
  .site-header,.site-footer,.ad-container,.mobile-nav,.result-actions,.calc-actions,.rate-group,.mode-toggle,.gst-type-toggle,nav,.no-print{ display:none !important; }
  body{ background:#fff; }
  .receipt{ box-shadow:none; border:1px solid #999; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}