/* ══════════════════════════════════════════════════════════
   GSTBill.app — Shared Design System
   WhatsApp-green theme, DM Sans, 740px wrapper aesthetic
   ══════════════════════════════════════════════════════════ */

/* ── RESET ── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}

/* ── VARIABLES ── */
:root{
  --green:#25D366;
  --green-dark:#128C7E;
  --green-mid:#20B954;
  --green-light:#DCFCE7;
  --green-pale:#F0FDF4;
  --amber:#FEF3C7;
  --amber-mid:#FCD34D;
  --sky:#E0F2FE;
  --sky-mid:#38BDF8;
  --orange:#F97316;
  --dark:#111827;
  --mid:#6B7280;
  --white:#ffffff;
  --gray-bg:#F3F4F6;
  --shadow-sm:0 1px 3px rgba(0,0,0,.06);
  --shadow-md:0 4px 16px rgba(0,0,0,.08);
  --shadow-lg:0 12px 40px rgba(0,0,0,.10);
  --radius:14px;
  --radius-sm:10px;
}

body{
  font-family:'DM Sans',system-ui,-apple-system,sans-serif;
  background:#E5DDD5;
  min-height:100vh;
  display:flex;
  justify-content:center;
  -webkit-font-smoothing:antialiased;
}

/* ── PAGE WRAPPER ── */
.page-wrapper{
  width:100%;max-width:900px;
  background:var(--white);
  border-radius:20px;
  overflow:hidden;
  box-shadow:var(--shadow-lg);
  margin:0 auto;
}

/* ── NAV ── */
nav.site-nav{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);
  padding:12px 24px;
  display:flex;align-items:center;justify-content:space-between;
  border-bottom:1px solid #f0f0f0;
}
.nav-logo{
  display:flex;align-items:center;gap:8px;
  font-weight:700;font-size:17px;color:var(--dark);
  text-decoration:none;
}
.nav-logo-icon{
  width:28px;height:28px;border-radius:8px;
  background:var(--green);
  display:flex;align-items:center;justify-content:center;
}
.nav-links{display:flex;gap:20px;align-items:center;}
.nav-links a{
  font-size:13px;color:var(--mid);text-decoration:none;font-weight:500;
  transition:color .2s;
}
.nav-links a:hover{color:var(--dark);}
.nav-cta{
  font-size:12px;font-weight:600;
  padding:7px 16px;border-radius:20px;
  background:var(--green);color:var(--white);
  text-decoration:none;transition:all .2s;
  display:inline-flex;align-items:center;gap:6px;
}
.nav-cta:hover{background:var(--green-mid);transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,211,102,.3);}

/* ── CONTENT AREA ── */
.content-area{
  padding:32px 24px;
}

/* ── TYPOGRAPHY (CONTENT PAGES) ── */
.content-area h1{
  font-size:28px;font-weight:800;line-height:1.2;
  color:var(--dark);margin-bottom:8px;
  letter-spacing:-.02em;
}
.content-area h2{
  font-size:22px;font-weight:700;line-height:1.25;
  color:var(--dark);margin:28px 0 12px;
  letter-spacing:-.01em;
}
.content-area h3{
  font-size:17px;font-weight:700;line-height:1.3;
  color:var(--green-dark);margin:20px 0 8px;
}
.content-area h4{
  font-size:15px;font-weight:700;color:var(--dark);
  margin:16px 0 8px;
}
.content-area p{
  font-size:14px;color:#374151;line-height:1.8;
  margin-bottom:14px;
}
.content-area a{
  color:var(--green-dark);text-decoration:underline;
  text-decoration-color:rgba(37,211,102,.3);
  text-underline-offset:2px;
  transition:all .2s;
}
.content-area a:hover{
  color:var(--green);text-decoration-color:var(--green);
}
.content-area strong{color:var(--dark);}
.content-area ul,.content-area ol{
  margin:0 0 16px 20px;
  font-size:14px;color:#374151;line-height:1.8;
}
.content-area li{margin-bottom:6px;}
.content-area li::marker{color:var(--green);}

/* ── BREADCRUMB ── */
.breadcrumb{
  font-size:12px;color:var(--mid);margin-bottom:16px;
}
.breadcrumb a{
  color:var(--mid);text-decoration:none;
}
.breadcrumb a:hover{color:var(--green);}

/* ── HERO BANNER (inner pages) ── */
.page-hero{
  padding:32px 24px 24px;
  background:
    radial-gradient(ellipse at 20% 50%,rgba(37,211,102,.08) 0%,transparent 60%),
    radial-gradient(ellipse at 80% 50%,rgba(254,243,199,.25) 0%,transparent 60%),
    var(--white);
  border-bottom:1px solid #f0f0f0;
}
.page-hero h1{
  font-size:28px;font-weight:800;line-height:1.2;
  color:var(--dark);margin-bottom:8px;letter-spacing:-.02em;
}
.page-hero .subtitle{
  font-size:14px;color:var(--mid);line-height:1.7;
  max-width:500px;
}
.page-hero .breadcrumb{margin-bottom:12px;}

/* ── CARDS ── */
.card{
  background:var(--gray-bg);
  border-radius:var(--radius);
  padding:20px;margin-bottom:16px;
  transition:transform .2s;
}
.card:hover{transform:translateY(-1px);}
.card-green{background:var(--green-pale);border-radius:var(--radius);padding:20px;margin-bottom:16px;}
.card-amber{background:var(--amber);border-radius:var(--radius);padding:20px;margin-bottom:16px;}
.card-sky{background:var(--sky);border-radius:var(--radius);padding:20px;margin-bottom:16px;}

/* ── TABLES ── */
.content-area table{
  width:100%;border-collapse:collapse;
  margin:16px 0;font-size:13px;
  border-radius:var(--radius-sm);
  overflow:hidden;
}
.content-area thead th{
  background:var(--dark);color:var(--white);
  padding:10px 14px;text-align:left;
  font-weight:600;font-size:12px;
}
.content-area tbody td{
  padding:10px 14px;border-bottom:1px solid #f0f0f0;
  color:#374151;
}
.content-area tbody tr:hover{background:var(--green-pale);}
.content-area tbody tr:last-child td{border-bottom:none;}

/* ── TABLE BOX (wrapped tables) ── */
.table-box{
  background:var(--white);
  border:1px solid #e5e7eb;
  padding:0;
  border-radius:var(--radius);
  margin:20px 0;
  overflow-x:auto;
}
.table-box table{margin:0;}

/* ── HIGHLIGHT / CALLOUT BOX ── */
.highlight-box{
  background:var(--green-pale);
  border-left:4px solid var(--green);
  padding:16px 20px;
  margin:20px 0;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  font-size:14px;color:#374151;line-height:1.7;
}
.highlight-box strong{color:var(--dark);}

/* ── CTA BOX ── */
.cta-box{
  background:linear-gradient(135deg,var(--green) 0%,var(--green-dark) 100%);
  border-radius:var(--radius);
  padding:24px;margin:24px 0;
  text-align:center;color:var(--white);
}
.cta-box h3,.cta-box h2{color:var(--white);margin-bottom:8px;}
.cta-box p{color:rgba(255,255,255,.85);font-size:13px;margin-bottom:14px;}
.cta-box .btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 22px;border-radius:10px;
  background:var(--white);color:var(--green-dark);
  font-size:13px;font-weight:600;text-decoration:none;
  transition:all .2s;border:none;cursor:pointer;
}
.cta-box .btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.2);}

/* ── FAQ SECTION ── */
.faq-section{margin:24px 0;}
.faq-section h2{margin-bottom:16px;}
.faq-item{
  padding:14px 0;border-bottom:1px solid #f0f0f0;
  cursor:pointer;
}
.faq-question{
  display:flex;justify-content:space-between;align-items:center;
  font-size:14px;font-weight:600;color:var(--dark);
}
.faq-icon{font-size:18px;color:var(--mid);font-weight:300;flex-shrink:0;transition:transform .2s;}
.faq-item.active .faq-icon{transform:rotate(45deg);}
.faq-answer{
  max-height:0;overflow:hidden;
  transition:max-height .3s ease, padding .3s ease;
  font-size:13px;color:var(--mid);line-height:1.7;
}
.faq-item.active .faq-answer{
  max-height:500px;padding-top:10px;
}

/* ── DOWNLOAD BUTTONS ── */
.download-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 20px;border-radius:10px;
  font-size:13px;font-weight:600;
  text-decoration:none;transition:all .2s;
  border:1px solid #e5e7eb;color:var(--dark);
  background:var(--white);
}
.download-btn:hover{
  border-color:var(--green);background:var(--green-pale);
  transform:translateY(-1px);text-decoration:none;
}
.download-btn.primary{
  background:var(--green);color:var(--white);border-color:var(--green);
}
.download-btn.primary:hover{
  background:var(--green-mid);
}

/* ── INVOICE PREVIEW ── */
.invoice{
  background:var(--white);
  border:1px solid #e5e7eb;
  border-radius:var(--radius);
  padding:20px;margin:20px 0;
  font-size:12px;
}
.invoice-header{
  display:flex;justify-content:space-between;align-items:flex-start;
  margin-bottom:16px;padding-bottom:12px;
  border-bottom:2px solid var(--green);
}
.invoice-title{font-size:16px;font-weight:800;color:var(--dark);}
.invoice-subtitle{font-size:11px;color:var(--mid);}
.invoice-details{
  display:grid;grid-template-columns:1fr 1fr;gap:8px;
  margin-bottom:16px;
}
.invoice-detail-item{font-size:11px;color:#374151;}
.invoice-detail-item strong{color:var(--dark);font-size:11px;}
.invoice-items{margin:16px 0;}
.invoice-item{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:8px;
  padding:6px 0;font-size:11px;color:#374151;
  border-bottom:1px solid #f0f0f0;
}
.invoice-item.header{
  font-weight:700;color:var(--dark);
  border-bottom:2px solid var(--dark);
}
.invoice-item.total{
  font-weight:700;color:var(--dark);
  border-top:2px solid var(--dark);border-bottom:none;
}
.breakdown{margin-top:12px;}
.breakdown-item{
  display:flex;justify-content:space-between;
  font-size:11px;padding:3px 0;color:#374151;
}
.breakdown-item.total{font-weight:700;color:var(--dark);border-top:1px solid var(--dark);padding-top:6px;}

/* ── BLOG LISTING ── */
.blog-grid{
  display:grid;grid-template-columns:1fr;gap:12px;
}
.blog-card{
  background:var(--gray-bg);border-radius:var(--radius);
  padding:16px;transition:transform .2s;
  text-decoration:none;display:block;
}
.blog-card:hover{transform:translateY(-2px);text-decoration:none;}
.blog-card h3{font-size:15px;color:var(--dark);margin:0 0 6px;}
.blog-card p{font-size:12px;color:var(--mid);margin:0;line-height:1.6;}

/* ── PRICING SECTION ── */
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:16px 0;}
.pricing-card{border-radius:var(--radius);padding:20px;transition:transform .25s;}
.pricing-card:hover{transform:translateY(-3px);}
.pricing-card.light{background:var(--gray-bg);color:var(--dark);}
.pricing-card.dark{background:var(--dark);color:var(--white);}
.plan-name{font-size:14px;font-weight:700;margin-bottom:2px;}
.plan-sub{font-size:10px;color:var(--mid);margin-bottom:12px;}
.pricing-card.dark .plan-sub{color:#9CA3AF;}
.price{margin-bottom:14px;}
.price-amount{font-size:28px;font-weight:800;}
.price-period{font-size:11px;color:var(--mid);}
.pricing-card.dark .price-period{color:#9CA3AF;}
.plan-features{list-style:none;margin:0 0 16px;padding:0;}
.plan-features li{
  font-size:11px;padding:3px 0;
  display:flex;align-items:center;gap:6px;
}
.plan-features li::marker{content:none;}
.check-icon{width:14px;height:14px;flex-shrink:0;color:var(--green);}
.pricing-card.dark .check-icon{color:#A78BFA;}

/* ── FOOTER ── */
footer.site-footer{
  padding:24px;
  border-top:1px solid #f0f0f0;
}
.footer-top{
  display:flex;justify-content:space-between;align-items:flex-start;
  flex-wrap:wrap;gap:16px;margin-bottom:12px;
}
.footer-brand{max-width:260px;}
.footer-desc{font-size:11px;color:var(--mid);line-height:1.6;margin-top:8px;margin-bottom:10px;}
.footer-seo{font-size:9px;color:var(--mid);line-height:1.6;margin-bottom:10px;}
.social-row{display:flex;gap:8px;}
.social-icon{
  width:28px;height:28px;border-radius:8px;
  background:var(--gray-bg);
  display:flex;align-items:center;justify-content:center;
  color:var(--mid);transition:all .2s;cursor:pointer;
  text-decoration:none;
}
.social-icon:hover{background:var(--green-light);color:var(--green);}
.social-icon svg{width:12px;height:12px;}
.footer-links{
  display:grid;grid-template-columns:1fr 1fr;gap:6px 24px;
}
.footer-links a{font-size:11px;color:var(--mid);text-decoration:none;transition:color .2s;}
.footer-links a:hover{color:var(--green);}
.footer-bottom{
  text-align:center;padding-top:12px;
  border-top:1px solid #f0f0f0;
  font-size:10px;color:var(--mid);
}

/* ── ANIMATIONS ── */
@keyframes fadeUp{from{opacity:0;transform:translateY(20px);}to{opacity:1;transform:translateY(0);}}
@keyframes fadeIn{from{opacity:0;}to{opacity:1;}}

/* ── SCROLL REVEAL ── */
.sr{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease;}
.sr.visible{opacity:1;transform:none;}

/* ── RESPONSIVE ── */
@media(max-width:600px){
  .page-wrapper{border-radius:0;}
  .nav-links{display:none;}
  .content-area{padding:20px 16px;}
  .page-hero{padding:24px 16px 20px;}
  .content-area h1,.page-hero h1{font-size:24px;}
  .pricing-grid{grid-template-columns:1fr 1fr;}
@media(max-width:480px){.pricing-grid{grid-template-columns:1fr;}}
  .invoice-details{grid-template-columns:1fr;}
  .footer-top{flex-direction:column;}
  .footer-links{grid-template-columns:1fr;}
}

/* ── DESKTOP (900px+) ── */
@media(min-width:900px){
  .page-wrapper{max-width:1100px;border-radius:0;box-shadow:none;}
  body{background:var(--white);}
  .content-area{padding:40px 64px;max-width:840px;margin:0 auto;}
  .page-hero{padding:40px 64px 32px;}
  .page-hero h1,.content-area h1{font-size:34px;}
  .content-area h2{font-size:24px;}
  .content-area p,.content-area ul,.content-area ol{font-size:15px;}
  .content-area table{font-size:14px;}
  .content-area thead th{font-size:13px;padding:12px 16px;}
  .content-area tbody td{padding:12px 16px;}
  nav.site-nav{padding:14px 64px;}
  footer.site-footer{padding:32px 64px;}
  .footer-top{gap:32px;}
  .footer-links{grid-template-columns:1fr 1fr 1fr;gap:8px 32px;}
  .pricing-grid{grid-template-columns:repeat(4,1fr);}
  .blog-grid{grid-template-columns:1fr 1fr;gap:16px;}
  .features-grid{gap:16px;}
  .faq-question{font-size:15px;}
  .faq-answer{font-size:14px;}
  .cta-box{padding:32px;}
  .cta-box p{font-size:14px;}
  .highlight-box{font-size:15px;}
}

/* ── LARGE DESKTOP (1200px+) ── */
@media(min-width:1200px){
  .page-wrapper{max-width:1200px;}
  .content-area{padding:48px 80px;}
}