/* =========================================================
   QR Code Payment Splitter — main stylesheet
   Mobile-first, responsive, fintech-inspired light theme.
   Palette: primary #2563EB, success #16A34A, error #DC2626.
   ========================================================= */

/* ---- Design tokens (colors, spacing, radii, shadows) ---- */
:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #EFF6FF;
    --dark: #111827;
    --muted: #6B7280;
    --bg: #F8FAFC;
    --card: #FFFFFF;
    --border: #E5E7EB;
    --success: #16A34A;
    --success-light: #F0FDF4;
    --error: #DC2626;
    --error-light: #FEF2F2;
    --warning: #D97706;

    --radius: 14px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(17, 24, 39, .08), 0 1px 2px rgba(17, 24, 39, .04);
    --shadow-lg: 0 10px 25px rgba(17, 24, 39, .10);

    --space: 8px;          /* 8px spacing system */
    --maxw: 1100px;

    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ---- Base reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background: var(--bg);
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 var(--space) 0; font-weight: 700; }
h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 calc(var(--space) * 2); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
ul, ol { margin: 0 0 calc(var(--space) * 2); padding-left: 1.2rem; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 calc(var(--space) * 2); }

.visually-hidden {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
    position: absolute; left: -999px; top: 0; z-index: 1000;
    background: var(--primary); color: #fff; padding: 8px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---- Buttons ---- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--space);
    font: inherit; font-weight: 600; cursor: pointer;
    padding: 10px 18px; border-radius: var(--radius-sm); border: 1px solid transparent;
    transition: background .15s, border-color .15s, transform .05s;
    text-decoration: none; line-height: 1.2;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: var(--card); color: var(--primary); border-color: var(--border); }
.btn-secondary:hover { background: var(--primary-light); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--muted); border-color: transparent; }
.btn-ghost:hover { color: var(--dark); text-decoration: none; }
.btn-lg { padding: 14px 26px; font-size: 1.05rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* ---- Header ---- */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: saturate(180%) blur(8px);
    border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: var(--space); color: var(--dark); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--primary); display: inline-flex; }
.brand-name { font-size: 1.02rem; }

.main-nav { display: none; gap: calc(var(--space) * 2); }
.main-nav a { color: var(--dark); font-weight: 500; font-size: .95rem; }
.main-nav a:hover { color: var(--primary); text-decoration: none; }

.nav-toggle {
    display: inline-flex; flex-direction: column; gap: 4px;
    background: none; border: 0; padding: 8px; cursor: pointer;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--dark); border-radius: 2px; transition: transform .2s, opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
    display: none; flex-direction: column; padding: 0 calc(var(--space) * 2) calc(var(--space) * 2);
    border-bottom: 1px solid var(--border); background: var(--card);
}
.mobile-nav.open { display: flex; }
.mobile-nav a { padding: 12px 0; color: var(--dark); border-bottom: 1px solid var(--border); }
.mobile-nav a:last-child { border-bottom: 0; }

/* ---- Hero ---- */
.hero {
    text-align: center;
    padding: calc(var(--space) * 7) 0 calc(var(--space) * 5);
    background:
        radial-gradient(1200px 300px at 50% -20%, var(--primary-light), transparent 70%),
        var(--bg);
}
.hero h1 { margin-bottom: calc(var(--space) * 2); }
.hero-subtitle { color: var(--muted); font-size: 1.1rem; max-width: 640px; margin: 0 auto calc(var(--space) * 3); }

/* ---- Tool card ---- */
.tool-section { margin-top: calc(var(--space) * -3); padding-bottom: calc(var(--space) * 5); }
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}
.tool-card { padding: calc(var(--space) * 3); }
.form-group { margin-bottom: calc(var(--space) * 3); }
.form-group > label { display: block; font-weight: 600; margin-bottom: var(--space); }

input, select, textarea {
    width: 100%; font: inherit; color: var(--dark);
    padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    background: #fff; transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}
textarea { resize: vertical; }

.upi-row { display: flex; gap: var(--space); flex-wrap: wrap; }
.upi-row > select, .upi-row > input { flex: 1 1 200px; }
.upi-row > .btn { flex: 0 0 auto; }
.upi-add-form { margin-top: calc(var(--space) * 2); padding-top: calc(var(--space) * 2); border-top: 1px dashed var(--border); }
.hint { font-size: .85rem; color: var(--muted); margin-top: var(--space); }
.delete-upi { margin-top: calc(var(--space) * 2); color: var(--error); font-size: .9rem; }

.amount-wrap { position: relative; }
.amount-wrap .rupee {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    color: var(--muted); font-weight: 600; pointer-events: none;
}
.amount-wrap input { padding-left: 30px; }

.error-text { color: var(--error); font-size: .9rem; margin: var(--space) 0 0; }
.success-text { color: var(--success); font-weight: 600; }

/* ---- Empty state ---- */
.empty-state {
    text-align: center; padding: calc(var(--space) * 5) calc(var(--space) * 3);
    color: var(--muted);
}
.empty-state h3 { color: var(--dark); margin-bottom: var(--space); }

/* ---- Results ---- */
.results { margin-top: calc(var(--space) * 4); }
.results-actions { display: flex; gap: var(--space); margin: calc(var(--space) * 3) 0; flex-wrap: wrap; }

/* ---- Payment cards grid ---- */
.payments-grid { display: grid; gap: calc(var(--space) * 3); grid-template-columns: 1fr; }
.payment-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: calc(var(--space) * 3); box-shadow: var(--shadow); text-align: center;
    transition: border-color .2s, box-shadow .2s;
}
.payment-card .pay-index { font-size: .85rem; color: var(--muted); font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }
.payment-card .pay-amount { font-size: 1.8rem; font-weight: 700; margin: var(--space) 0; }
.payment-card .pay-ref { font-size: .8rem; color: var(--muted); margin-bottom: calc(var(--space) * 2); word-break: break-all; }
.payment-card .pay-remark { font-size: .95rem; font-weight: 700; margin-bottom: var(--space); }
.payment-card .qr-box {
    display: inline-flex; padding: calc(var(--space) * 2); background: #fff;
    border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.payment-card .qr-box img, .payment-card .qr-box canvas { width: 200px; height: 200px; display: block; }


.tool-disclaimer {
    margin-top: calc(var(--space) * 3); font-size: .85rem; color: var(--muted);
    text-align: center; max-width: 720px; margin-left: auto; margin-right: auto;
}

/* ---- SEO content sections ---- */
.content-section { padding: calc(var(--space) * 5) 0; }
.content-section h2 { margin-bottom: calc(var(--space) * 2); }
.content-section p { color: #374151; }
details {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: calc(var(--space) * 2); margin-bottom: var(--space);
}
details summary { font-weight: 600; cursor: pointer; padding: var(--space) 0; }
details summary::marker { color: var(--primary); }
details p { margin: calc(var(--space) * 2) 0 0; color: #374151; }
.example-list { list-style: none; padding: 0; }
.example-list li { padding: 8px 0; border-bottom: 1px solid var(--border); font-weight: 500; }
.steps-list li { margin-bottom: calc(var(--space) * 2); }
.steps-list strong { color: var(--primary); }

/* ---- Contact form ---- */
.contact-form { max-width: 560px; }

/* ---- Footer ---- */
.site-footer { background: #fff; border-top: 1px solid var(--border); margin-top: calc(var(--space) * 4); }
.footer-inner { display: grid; gap: calc(var(--space) * 3); padding: calc(var(--space) * 4) 0; }
.footer-name { font-weight: 700; margin: 0 0 var(--space); }
.footer-desc { color: var(--muted); font-size: .9rem; margin: 0; max-width: 320px; }
.footer-nav { display: flex; flex-direction: column; gap: var(--space); }
.footer-nav a { color: var(--dark); font-size: .92rem; }
.footer-copy { border-top: 1px solid var(--border); padding: calc(var(--space) * 2) 0; text-align: center; }
.footer-copy p { margin: 0; color: var(--muted); font-size: .85rem; }

/* ---- Responsive breakpoints ---- */
@media (min-width: 600px) {
    .footer-inner { grid-template-columns: 1fr 1fr 1fr; }
    .payments-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 768px) {
    .main-nav { display: flex; }
    .nav-toggle { display: none; }
    .payments-grid { grid-template-columns: repeat(3, 1fr); }
    .tool-card { padding: calc(var(--space) * 4); }
}
@media (min-width: 1024px) {
    .payments-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ---- Print styles: hide nav/buttons, show QR + amounts ---- */
@media print {
    .site-header, .site-footer, .nav-toggle, .results-actions,
    .tool-card, .empty-state, .tool-disclaimer, #generate-btn { display: none !important; }
    body { background: #fff; }
    .payment-card { box-shadow: none; border: 1px solid #000; page-break-inside: avoid; }
    .payment-card .qr-box { border: 1px solid #000; }
}

.qr-merchant-note { margin: 0 0 calc(var(--space) * 3); padding: var(--space) calc(var(--space) * 1.5); border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }


/* ===== Modern visual refresh ===== */
:root {
  --primary:#635BFF; --primary-dark:#4F46E5; --primary-light:#EEF2FF;
  --accent:#06B6D4; --dark:#0B1220; --muted:#64748B; --bg:#F5F7FB;
  --card:rgba(255,255,255,.94); --border:#E2E8F0; --radius:20px;
  --shadow:0 12px 35px rgba(15,23,42,.08); --shadow-lg:0 24px 70px rgba(15,23,42,.12);
}
body { background:linear-gradient(180deg,#F8FAFC 0%,#F3F6FF 42%,#F8FAFC 100%); color:var(--dark); }
.site-header { background:rgba(255,255,255,.82); border-bottom:1px solid rgba(226,232,240,.75); box-shadow:0 4px 24px rgba(15,23,42,.05); }
.brand-mark { color:var(--primary); filter:drop-shadow(0 8px 16px rgba(99,91,255,.25)); }
.brand-name { letter-spacing:-.02em; }
.hero { position:relative; overflow:hidden; padding:90px 0 75px; background:radial-gradient(circle at 50% 0%,rgba(99,91,255,.18),transparent 40%),linear-gradient(135deg,#F8FAFC,#EEF2FF 55%,#ECFEFF); }
.hero:after { content:""; position:absolute; width:260px;height:260px;border-radius:50%;right:-100px;top:30px;background:rgba(6,182,212,.12);filter:blur(2px); }
.hero h1 { font-size:clamp(2.3rem,6vw,4.4rem); letter-spacing:-.055em; max-width:900px; margin:0 auto 18px; }
.hero-subtitle { font-size:1.15rem; line-height:1.75; }
.btn { border-radius:12px; box-shadow:0 8px 20px rgba(15,23,42,.08); }
.btn-primary { background:linear-gradient(135deg,var(--primary),#7C3AED); border:0; }
.btn-primary:hover { background:linear-gradient(135deg,var(--primary-dark),#6D28D9); transform:translateY(-1px); }
.tool-section { margin-top:-35px; position:relative; z-index:2; }
.tool-card { padding:32px; border:1px solid rgba(255,255,255,.8); box-shadow:var(--shadow-lg); backdrop-filter:blur(18px); }
.form-group { padding:4px 0; }
input,select,textarea { border-radius:14px; background:#F8FAFC; border-color:#DCE3EF; }
input:focus,select:focus,textarea:focus { border-color:var(--primary); box-shadow:0 0 0 4px rgba(99,91,255,.12); }
.results { padding-top:10px; }
.qr-merchant-note { background:linear-gradient(135deg,#EEF2FF,#ECFEFF); border:1px solid #DDE4FF; border-radius:16px; padding:16px 18px; box-shadow:0 8px 25px rgba(99,91,255,.07); }
.payment-card { border:1px solid rgba(226,232,240,.9); border-radius:22px; padding:24px; box-shadow:var(--shadow); background:rgba(255,255,255,.97); }
.payment-card:hover { transform:translateY(-4px); box-shadow:0 20px 45px rgba(15,23,42,.13); border-color:#C7D2FE; }
.payment-card .pay-index { color:var(--primary); }
.payment-card .pay-amount { font-size:2rem; letter-spacing:-.04em; }
.payment-card .pay-remark { background:#F8FAFC; border-radius:10px; padding:9px 12px; }
.payment-card .qr-box { padding:14px; border-radius:18px; box-shadow:inset 0 0 0 1px #EEF2F7; }
.content-section { max-width:900px; }
.content-section h2 { letter-spacing:-.025em; }
.page-hero { padding:75px 0 60px; background:radial-gradient(circle at 20% 10%,rgba(99,91,255,.16),transparent 35%),linear-gradient(135deg,#F8FAFC,#EEF2FF); }
.page-hero h1 { font-size:clamp(2.2rem,5vw,3.6rem); letter-spacing:-.05em; margin-top:8px; }
.page-hero p { max-width:760px; color:var(--muted); font-size:1.08rem; }
.eyebrow,.blog-kicker { display:inline-block; color:var(--primary); font-size:.75rem; font-weight:800; letter-spacing:.14em; }
.blog-grid-section { padding:55px 0 80px; }
.blog-grid { display:grid; grid-template-columns:repeat(1,minmax(0,1fr)); gap:20px; }
.blog-card { display:grid; grid-template-columns:auto 1fr; gap:18px; background:rgba(255,255,255,.9); border:1px solid var(--border); border-radius:20px; padding:24px; box-shadow:var(--shadow); transition:.2s ease; }
.blog-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-lg); border-color:#C7D2FE; }
.blog-card-number { font-size:1.8rem; font-weight:900; color:#CBD5E1; }
.blog-card h2 { font-size:1.25rem; margin:7px 0 9px; }
.blog-card h2 a { color:var(--dark); }
.blog-card p { color:var(--muted); margin-bottom:12px; }
.read-more { font-weight:700; }
.article-page { padding:65px 0 90px; }
.article-wrap { max-width:850px; }
.article-page h1 { font-size:clamp(2.25rem,5vw,4rem); letter-spacing:-.05em; margin:10px 0 18px; }
.article-lead { color:var(--muted); font-size:1.15rem; line-height:1.75; }
.article-body { margin-top:35px; background:rgba(255,255,255,.88); border:1px solid var(--border); border-radius:24px; padding:clamp(24px,5vw,50px); box-shadow:var(--shadow); }
.article-body p { color:#334155; font-size:1.05rem; line-height:1.85; }
.article-body h2 { margin-top:35px; }
.article-cta { margin-top:35px; padding:22px; border-radius:18px; background:linear-gradient(135deg,#EEF2FF,#ECFEFF); display:flex; gap:16px; align-items:center; justify-content:space-between; flex-wrap:wrap; }
@media (min-width:700px){ .blog-grid{grid-template-columns:repeat(2,minmax(0,1fr));} }
@media (min-width:1000px){ .blog-grid{grid-template-columns:repeat(3,minmax(0,1fr));} .blog-card{grid-template-columns:1fr;} .blog-card-number{font-size:1.3rem;} }