/* ==========================================================================
   What Mobile Payment — Design System
   Brand: Open Sans (body) + Montserrat (headings), blue/green/navy palette
   ========================================================================== */

:root {
  /* Brand palette (sourced from what-mobile-payment.com) */
  --color-primary: #1f8efa;
  --color-primary-dark: #0f6fd1;
  --color-primary-light: #e6f3ff;
  --color-accent: #04c884;
  --color-accent-dark: #039e69;
  --color-navy-900: #19242f;
  --color-navy-800: #232d41;
  --color-navy-700: #3f4a69;
  --color-navy-600: #6279a7;
  --color-surface-tint: #edf2f7;
  --color-surface: #f6f9fc;
  --color-white: #ffffff;

  /* Semantic tokens */
  --color-bg: var(--color-white);
  --color-bg-muted: var(--color-surface);
  --color-text: var(--color-navy-900);
  --color-text-muted: var(--color-navy-700);
  --color-border: #dbe4ee;
  --color-success: var(--color-accent);
  --color-danger: #e0483e;
  --color-link: var(--color-primary-dark);

  /* Typography */
  --font-heading: "Montserrat", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Open Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;
  --fs-2xl: 2.25rem;
  --fs-3xl: 3rem;

  /* Spacing scale (8pt rhythm) */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;

  /* Layout */
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(25, 36, 47, 0.06), 0 1px 3px rgba(25, 36, 47, 0.08);
  --shadow-md: 0 4px 12px rgba(25, 36, 47, 0.08), 0 2px 4px rgba(25, 36, 47, 0.06);
  --shadow-lg: 0 12px 32px rgba(25, 36, 47, 0.12), 0 4px 8px rgba(25, 36, 47, 0.06);
  --transition-fast: 150ms ease-out;
  --transition-base: 220ms ease-out;
  --z-nav: 100;
  --z-dropdown: 200;
  --z-modal: 1000;
}

/* This site uses a single, brand-matched light theme — declare it
   explicitly so browsers/OSes don't auto-invert colors into a broken
   partial dark mode over hardcoded brand colors. */
:root { color-scheme: light; }

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; width: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--color-link); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-navy-900);
  line-height: 1.25;
  margin: 0 0 var(--space-2);
  font-weight: 700;
}
h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); }
p { margin: 0 0 var(--space-2); max-width: 68ch; }
button { font-family: inherit; }

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-navy-900);
  color: #fff;
  padding: var(--space-1) var(--space-2);
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-3);
}
.section { padding-block: var(--space-6); }
.section--muted { background: var(--color-bg-muted); }
.section--navy { background: linear-gradient(160deg, var(--color-navy-900), var(--color-navy-800)); color: #fff; }
.section--navy h1, .section--navy h2, .section--navy h3 { color: #fff; }
.section-head { max-width: 720px; margin: 0 0 var(--space-5); }
.section-head--center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  background: var(--color-primary-light);
  padding: 0.3em 0.9em;
  border-radius: 999px;
  margin-bottom: var(--space-2);
}
.section--navy .eyebrow { color: var(--color-accent); background: rgba(4, 200, 132, 0.14); }

.grid { display: grid; gap: var(--space-3); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  h1 { font-size: var(--fs-2xl); }
  h2 { font-size: var(--fs-xl); }
  .section { padding-block: var(--space-5); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-sm);
  padding: 0.85em 1.6em;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  min-height: 44px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); box-shadow: var(--shadow-md); }
.btn-accent { background: var(--color-accent); color: #08331f; }
.btn-accent:hover { background: var(--color-accent-dark); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; border-color: currentColor; color: inherit; }
.btn-outline:hover { background: rgba(255, 255, 255, 0.08); }
.section:not(.section--navy) .btn-outline { border-color: var(--color-navy-700); color: var(--color-navy-800); }
.btn-ghost { background: transparent; color: var(--color-link); padding-inline: 0.4em; }
.btn-block { width: 100%; }
.btn-sm { padding: 0.6em 1.2em; font-size: var(--fs-xs); min-height: 36px; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-1);
  min-height: 72px;
}
.brand { display: flex; align-items: center; gap: 0.6em; font-family: var(--font-heading); font-weight: 700; color: var(--color-navy-900); }
.brand img { height: 44px; width: auto; }
.nav-links { display: flex; align-items: center; gap: var(--space-3); }
.nav-links a, .nav-dropdown-trigger {
  color: var(--color-navy-800);
  font-weight: 600;
  font-size: var(--fs-sm);
  padding: 0.5em 0;
  border-bottom: 2px solid transparent;
  background: none;
  border-top: none; border-left: none; border-right: none;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 0.3em;
}
.nav-links a:hover, .nav-links a[aria-current="page"],
.nav-dropdown-trigger:hover, .nav-dropdown.is-open .nav-dropdown-trigger {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}
.nav-dropdown-trigger svg { width: 14px; height: 14px; transition: transform var(--transition-fast); }
.nav-dropdown:hover .nav-dropdown-trigger svg,
.nav-dropdown.is-open .nav-dropdown-trigger svg { transform: rotate(180deg); }
.nav-dropdown { position: relative; }
.nav-dropdown-panel {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  display: grid;
  gap: 0.2em;
  min-width: 240px;
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  translate: 0 6px;
  transition: opacity var(--transition-base), translate var(--transition-base), visibility var(--transition-base);
}
.nav-dropdown:hover .nav-dropdown-panel,
.nav-dropdown:focus-within .nav-dropdown-panel {
  opacity: 1;
  visibility: visible;
  translate: 0 0;
}
.nav-dropdown-panel a { border: none; padding: 0.6em 0.8em; border-radius: var(--radius-sm); font-weight: 500; }
.nav-dropdown-panel a:hover { background: var(--color-primary-light); border: none; }
.nav-cta { display: flex; align-items: center; gap: var(--space-2); }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.5em;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
}
.nav-toggle svg { width: 26px; height: 26px; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-links {
    position: fixed;
    inset: 72px 0 0 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3);
    gap: 0;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-links a { padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); width: 100%; }
  .nav-dropdown-panel {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    translate: none;
    display: none;
    padding-left: var(--space-2);
  }
  .nav-dropdown.is-open .nav-dropdown-panel { display: grid; }
  .nav-cta { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(1200px 600px at 85% -10%, rgba(31, 142, 250, 0.35), transparent 60%),
              linear-gradient(160deg, var(--color-navy-900), var(--color-navy-800));
  color: #fff;
  padding-block: var(--space-7) var(--space-6);
  position: relative;
  overflow: clip;
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-5); align-items: center; }
.hero h1 { color: #fff; font-size: clamp(2rem, 4vw, var(--fs-3xl)); }
.hero-lede { color: #cdd8ea; font-size: var(--fs-md); max-width: 52ch; }
.hero-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-top: var(--space-3); }
.hero-media { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
}

/* Segment selector — signature interactive element */
.segment-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-5);
}
.segment-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  color: #fff;
  transition: transform var(--transition-base), background var(--transition-base), border-color var(--transition-base);
}
.segment-card:hover, .segment-card:focus-within {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-accent);
  transform: translateY(-4px);
}
.segment-card .segment-icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: rgba(4, 200, 132, 0.16);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.segment-card h3 { color: #fff; font-size: var(--fs-md); margin-bottom: 0.3em; }
.segment-card p { color: #b7c3d9; font-size: var(--fs-sm); margin-bottom: var(--space-2); }
.segment-card a.btn { width: 100%; }
@media (max-width: 768px) {
  .segment-picker { grid-template-columns: 1fr; }
}

/* Trust bar */
.trust-bar { padding-block: var(--space-4); border-bottom: 1px solid var(--color-border); }
.trust-bar-inner { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; justify-content: space-between; }
.trust-bar-label { font-size: var(--fs-xs); color: var(--color-text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; white-space: nowrap; }
.trust-logos { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.trust-logos img { height: 26px; width: auto; object-fit: contain; filter: grayscale(15%); opacity: 0.85; }

/* ---------- Cards ---------- */
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-2);
}
.card h3 { margin-bottom: 0.4em; }
.card-link { font-weight: 700; font-size: var(--fs-sm); display: inline-flex; align-items: center; gap: 0.3em; }

/* Category card */
.category-card { display: flex; flex-direction: column; height: 100%; }
.category-card .count { font-size: var(--fs-xs); color: var(--color-text-muted); margin-bottom: var(--space-1); }

/* ---------- Vendor comparison ---------- */
.vendor-table-wrap { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--color-border); }
table.vendor-table { width: 100%; border-collapse: collapse; min-width: 640px; background: #fff; }
.vendor-table th, .vendor-table td { text-align: left; padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--color-border); }
.vendor-table th { background: var(--color-surface-tint); font-family: var(--font-heading); font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-navy-800); }
.vendor-table tr:last-child td { border-bottom: none; }
.vendor-name { display: flex; align-items: center; gap: 0.7em; font-weight: 700; }
.vendor-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--color-navy-900); color: #fff;
  display: grid; place-items: center;
  font-family: var(--font-heading); font-weight: 700; font-size: var(--fs-sm);
  flex-shrink: 0;
}
.tag { display: inline-block; font-size: var(--fs-xs); font-weight: 700; padding: 0.2em 0.7em; border-radius: 999px; background: var(--color-primary-light); color: var(--color-primary-dark); }
.tag--accent { background: rgba(4,200,132,0.14); color: var(--color-accent-dark); }

.vendor-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: var(--space-3); }
.vendor-card { display: flex; flex-direction: column; gap: var(--space-1); }
.vendor-card-head { display: flex; align-items: center; gap: 0.8em; }
.vendor-card .tags { display: flex; gap: 0.4em; flex-wrap: wrap; margin-block: 0.4em; }
.vendor-card .btn { margin-top: auto; }

.disclosure-note {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  background: var(--color-surface-tint);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  margin-block: var(--space-3);
}

/* ---------- Fee calculator (signature widget) ---------- */
.calculator {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4);
  color: var(--color-text);
  display: grid;
  gap: var(--space-3);
}
.calculator label { font-weight: 700; font-size: var(--fs-sm); display: block; margin-bottom: 0.4em; }
.calculator input[type="range"] { width: 100%; accent-color: var(--color-primary); }
.calculator input[type="number"] {
  width: 100%; font-size: var(--fs-md); padding: 0.6em 0.8em;
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: var(--font-heading); font-weight: 700;
}
.calc-row { display: flex; justify-content: space-between; align-items: baseline; }
.calc-value { font-family: var(--font-heading); font-weight: 700; color: var(--color-primary-dark); }
.calc-results { display: grid; gap: var(--space-1); margin-top: var(--space-1); }
.calc-result-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: var(--space-2); border-radius: var(--radius-sm);
  background: var(--color-surface-tint);
}
.calc-result-item.best { background: rgba(4, 200, 132, 0.12); border: 1px solid var(--color-accent); }
.calc-result-item .fee-amount { font-family: var(--font-heading); font-weight: 700; font-size: var(--fs-md); }
.calc-savings { text-align: center; padding-top: var(--space-2); border-top: 1px dashed var(--color-border); font-size: var(--fs-sm); }
.calc-savings strong { color: var(--color-accent-dark); font-size: var(--fs-lg); }

/* ---------- Benefit list ---------- */
.benefit-item { display: flex; gap: var(--space-2); align-items: flex-start; }
.benefit-item .card-icon { flex-shrink: 0; margin-bottom: 0; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { font-size: var(--fs-xs); color: var(--color-text-muted); padding-block: var(--space-2); }
.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs span[aria-current] { color: var(--color-text); font-weight: 600; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin-bottom: 0.2em; font-size: var(--fs-xl); }
.cta-band p { color: #e4f0ff; margin: 0; }
.cta-band .btn-primary { background: #fff; color: var(--color-primary-dark); }
.cta-band .btn-primary:hover { background: var(--color-surface-tint); }

/* ---------- Footer ---------- */
.site-footer { background: var(--color-navy-900); color: #b7c3d9; padding-block: var(--space-6) var(--space-4); }
.site-footer h4 { color: #fff; font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: 0.05em; }
.site-footer a { color: #b7c3d9; }
.site-footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: var(--space-4); }
.footer-grid li { margin-bottom: 0.6em; }
.footer-brand img { height: 32px; margin-bottom: var(--space-2); filter: brightness(0) invert(1); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--space-2);
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: var(--space-5); padding-top: var(--space-3);
  font-size: var(--fs-xs); color: #8494ac;
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0; padding: 0; margin: -1px;
}