/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --brand-green: #a4c639;
  --brand-green-dark: #8bab2c;
  --brand-green-darker: #7a9626;
  --navy: #1e2d3b;
  --navy-light: #2a3f52;
  --navy-lighter: #3d5975;
  --ink: #1e2d3b;
  --gray-900: #212529;
  --gray-700: #4a5560;
  --gray-500: #6b7885;
  --gray-300: #d7dde1;
  --gray-100: #f7f7f7;
  --blue-gray: #dde8eb;
  --white: #ffffff;
  --danger: #c0392b;

  --sans: "Inter", Arial, Helvetica, "Segoe UI", sans-serif;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(30, 45, 59, 0.08);
  --shadow-md: 0 6px 24px rgba(30, 45, 59, 0.12);
  --shadow-lg: 0 16px 48px rgba(30, 45, 59, 0.18);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --container: 1120px;
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: clip;
}
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; letter-spacing: -0.01em; font-weight: 800; }
ul { list-style: none; padding: 0; }
::selection { background: var(--brand-green); color: var(--navy); }

:focus-visible {
  outline: 2px solid var(--brand-green-dark);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--white); color: var(--navy);
  z-index: 9999; border-radius: 8px; font-weight: 600;
  box-shadow: var(--shadow-md);
}
.skip-link:focus { top: 1rem; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* =============================================================
   3. Header
   ============================================================= */
.site-header {
  background: var(--navy);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--white);
  white-space: nowrap;
}
.brand .brand-mark {
  width: 34px; height: 34px;
  border-radius: 8px;
  background: var(--brand-green);
  display: flex; align-items: center; justify-content: center;
  color: var(--navy);
  flex: none;
}
.brand .brand-mark svg { width: 20px; height: 20px; }
.brand small {
  display: block;
  font-weight: 500;
  font-size: .68rem;
  color: var(--blue-gray);
  letter-spacing: .02em;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.site-nav a {
  font-weight: 600;
  font-size: .92rem;
  color: var(--blue-gray);
  transition: color .2s var(--ease-out);
}
.site-nav a:hover { color: var(--brand-green); }
.site-nav a.nav-cta {
  background: var(--brand-green);
  color: var(--navy);
  padding: .55rem 1.1rem;
  border-radius: 999px;
}
.site-nav a.nav-cta:hover { background: var(--white); color: var(--navy); }

/* =============================================================
   4. Hero
   ============================================================= */
.hero {
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-light) 100%);
  color: var(--white);
  padding: 2.75rem 0 2.25rem;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.65rem, 4.4vw, 2.65rem);
  max-width: 22ch;
  margin-inline: auto;
}
.hero h1 .accent { color: var(--brand-green); }
.hero p.subtitle {
  margin-top: .85rem;
  color: var(--blue-gray);
  font-size: clamp(1rem, 2vw, 1.15rem);
  max-width: 52ch;
  margin-inline: auto;
}
.trust-row {
  margin-top: 1.35rem;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.4rem;
  justify-content: center;
  font-size: .82rem;
  color: var(--blue-gray);
}
.trust-row span { display: inline-flex; align-items: center; gap: .4rem; }
.trust-row svg { width: 15px; height: 15px; color: var(--brand-green); flex: none; }

/* =============================================================
   5. Tool card
   ============================================================= */
.tool-section {
  margin-top: -1.75rem;
  padding-bottom: 1rem;
}
.tool-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-300);
  padding: 1.5rem;
  max-width: 780px;
  margin-inline: auto;
}
.tool-field-group {
  display: block;
}
.field-label {
  display: block;
  font-size: .82rem;
  font-weight: 700;
  color: var(--gray-700);
  margin-bottom: .4rem;
  text-transform: uppercase;
  letter-spacing: .03em;
}
.category-select-wrap { margin-bottom: 1.1rem; }
select.category-select {
  width: 100%;
  padding: .8rem 1rem;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  background: var(--gray-100) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%231e2d3b" stroke-width="2.5"><path d="M6 9l6 6 6-6"/></svg>') no-repeat right 1rem center / 16px;
  appearance: none;
  transition: border-color .2s var(--ease-out);
}
select.category-select:focus { border-color: var(--brand-green-dark); }

.converter-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: .75rem;
  align-items: end;
}
.conv-col { min-width: 0; }
.conv-col select,
.conv-col input[type="text"] {
  width: 100%;
  padding: .75rem .85rem;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 1.05rem;
  color: var(--navy);
  background: var(--white);
  transition: border-color .2s var(--ease-out);
}
.conv-col select {
  margin-bottom: .55rem;
  font-weight: 600;
  font-size: .92rem;
  background: var(--white) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%236b7885" stroke-width="2.5"><path d="M6 9l6 6 6-6"/></svg>') no-repeat right .7rem center / 14px;
  appearance: none;
  padding-right: 2rem;
}
.conv-col input[type="text"]:focus,
.conv-col select:focus { border-color: var(--brand-green-dark); }
.conv-col input.output-field {
  background: var(--gray-100);
  font-weight: 700;
  color: var(--navy);
}
.conv-col input.has-error { border-color: var(--danger); }

.swap-btn-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: .55rem;
}
.swap-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--navy);
  color: var(--white);
  display: flex; align-items: center; justify-content: center;
  transition: transform .35s var(--ease-out), background .2s var(--ease-out);
  flex: none;
}
.swap-btn:hover { background: var(--brand-green-dark); }
.swap-btn svg { width: 20px; height: 20px; }
.swap-btn.is-spinning { transform: rotate(180deg); }

.result-row {
  margin-top: 1.1rem;
  display: flex;
  align-items: center;
  gap: .6rem;
  flex-wrap: wrap;
}
.copy-btn {
  background: var(--brand-green);
  color: var(--navy);
  font-weight: 700;
  font-size: .88rem;
  padding: .65rem 1.05rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  transition: background .2s var(--ease-out), transform .15s var(--ease-out);
}
.copy-btn:hover { background: var(--brand-green-dark); }
.copy-btn:active { transform: scale(.97); }
.copy-btn svg { width: 16px; height: 16px; }
.copy-btn.is-copied { background: var(--navy); color: var(--white); }

.formula-note {
  margin-top: .9rem;
  font-size: .85rem;
  color: var(--gray-500);
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  padding: .65rem .9rem;
}
.formula-note code {
  font-family: "SFMono-Regular", Consolas, monospace;
  color: var(--navy);
}

.privacy-badge {
  max-width: 780px;
  margin: .9rem auto 0;
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .83rem;
  color: var(--gray-500);
  justify-content: center;
  text-align: center;
}
.privacy-badge svg { width: 15px; height: 15px; color: var(--brand-green-dark); flex: none; }

/* =============================================================
   6. Popular conversions chips
   ============================================================= */
.popular-section {
  padding: 1.75rem 0 .5rem;
}
.popular-section h2,
.section-title {
  font-size: 1.35rem;
  text-align: center;
  margin-bottom: .3rem;
}
.section-sub {
  text-align: center;
  color: var(--gray-500);
  font-size: .92rem;
  margin-bottom: 1.2rem;
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  justify-content: center;
  max-width: 900px;
  margin-inline: auto;
}
.chip {
  background: var(--gray-100);
  border: 1px solid var(--gray-300);
  color: var(--navy);
  font-weight: 600;
  font-size: .85rem;
  padding: .5rem .9rem;
  border-radius: 999px;
  transition: background .18s var(--ease-out), border-color .18s var(--ease-out);
}
.chip:hover { background: var(--brand-green); border-color: var(--brand-green); }

/* =============================================================
   7. Ad slots
   ============================================================= */
.ad-slot {
  border: 1px dashed var(--gray-300);
  border-radius: var(--radius-sm);
  background: var(--gray-100);
  color: var(--gray-500);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin: 1.75rem auto;
}
.ad-slot.ad-banner { max-width: var(--container); min-height: 90px; margin-inline: 1.25rem; }
@media (min-width: 720px) { .ad-slot.ad-banner { margin-inline: auto; } }
.ad-slot.ad-incontent { max-width: 728px; min-height: 250px; }
.ad-slot.ad-sidebar { min-height: 250px; }
/* PASTE YOUR ADSENSE (OR OTHER AD NETWORK) CODE INSIDE THESE .ad-slot DIVS */

/* =============================================================
   8. Content sections (how-to, SEO copy, FAQ)
   ============================================================= */
.section { padding: 2.75rem 0; }
.section.alt { background: var(--gray-100); }
.section.navy {
  background: var(--navy);
  color: var(--white);
}
.section.navy .section-sub { color: var(--blue-gray); }

.steps-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
  max-width: 960px;
  margin-inline: auto;
}
@media (min-width: 720px) { .steps-grid { grid-template-columns: repeat(3, 1fr); } }
.step-card {
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}
.step-card .step-num {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--brand-green);
  color: var(--navy);
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto .9rem;
  font-size: 1.05rem;
}
.step-card h3 { font-size: 1.05rem; margin-bottom: .5rem; }
.step-card p { color: var(--gray-700); font-size: .93rem; }

.seo-copy {
  max-width: 760px;
  margin-inline: auto;
  color: var(--gray-700);
}
.seo-copy h2 { color: var(--navy); font-size: 1.4rem; margin-bottom: .9rem; }
.seo-copy h3 { color: var(--navy); font-size: 1.1rem; margin: 1.4rem 0 .5rem; }
.seo-copy p { margin-bottom: .9rem; }
.seo-copy ul { margin: 0 0 .9rem 0; }
.seo-copy li {
  padding-left: 1.4rem;
  position: relative;
  margin-bottom: .45rem;
}
.seo-copy li::before {
  content: "";
  position: absolute; left: 0; top: .55rem;
  width: 7px; height: 7px;
  background: var(--brand-green-dark);
  border-radius: 50%;
}
.category-table-wrap { overflow-x: auto; margin-bottom: .9rem; }
table.category-table {
  border-collapse: collapse;
  width: 100%;
  font-size: .88rem;
}
table.category-table th, table.category-table td {
  border: 1px solid var(--gray-300);
  padding: .55rem .75rem;
  text-align: left;
}
table.category-table th { background: var(--gray-100); color: var(--navy); }

.faq-list { max-width: 760px; margin-inline: auto; }
.faq-item {
  border-bottom: 1px solid var(--gray-300);
  padding: 1rem 0;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--navy);
  font-size: 1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--brand-green-dark);
  flex: none;
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p { margin-top: .65rem; color: var(--gray-700); font-size: .93rem; }

.more-tools-grid {
  display: grid;
  gap: .8rem;
  grid-template-columns: repeat(2, 1fr);
  max-width: 900px;
  margin-inline: auto;
}
@media (min-width: 720px) { .more-tools-grid { grid-template-columns: repeat(4, 1fr); } }
.more-tools-grid a {
  display: block;
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  padding: .85rem 1rem;
  font-weight: 600;
  font-size: .88rem;
  color: var(--navy);
  transition: border-color .18s var(--ease-out), transform .18s var(--ease-out);
}
.more-tools-grid a:hover { border-color: var(--brand-green-dark); transform: translateY(-2px); }

/* =============================================================
   9. Footer
   ============================================================= */
.site-footer {
  background: var(--navy);
  color: var(--blue-gray);
  padding: 2.5rem 0 1.5rem;
  font-size: .88rem;
}
.footer-grid {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: 1fr;
  margin-bottom: 1.75rem;
}
@media (min-width: 720px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr; } }
.footer-grid h4 {
  color: var(--white);
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: .8rem;
}
.footer-grid ul li { margin-bottom: .5rem; }
.footer-grid a:hover { color: var(--brand-green); }
.footer-bottom {
  border-top: 1px solid var(--navy-lighter);
  padding-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.5rem;
  justify-content: space-between;
  font-size: .8rem;
  color: var(--gray-300);
}

/* =============================================================
   10. Responsive
   ============================================================= */
@media (max-width: 539px) {
  .site-nav a:not(.nav-cta) { display: none; }
  .site-nav a.nav-cta {
    font-size: .8rem;
    padding: .5rem .85rem;
    white-space: nowrap;
  }
  .brand small { display: none; }
  .brand { font-size: 1rem; }
  .converter-grid {
    grid-template-columns: 1fr;
  }
  .swap-btn-wrap { padding-bottom: 0; margin: -.25rem 0; }
  .swap-btn { transform: rotate(90deg); margin-inline: auto; }
  .swap-btn.is-spinning { transform: rotate(270deg); }
}

@media (min-width: 540px) {
  .tool-card { padding: 2rem; }
}
@media (min-width: 960px) {
  .hero { padding: 3.5rem 0 3rem; }
}