:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f9;
  --surface: #ffffff;
  --border: #dfe5ea;
  --text: #13181d;
  --muted: #5e6b78;
  --accent: #0ea5c9;
  --accent-strong: #0b87a5;
  --accent-soft: #e3f6fb;
  --dark: #0c1820;
  --dark-2: #12232e;
  --ok: #16a34a;
  --radius: 14px;
  --mono: ui-monospace, 'Cascadia Mono', Consolas, monospace;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1217;
    --bg-soft: #121a21;
    --surface: #151e26;
    --border: #26323d;
    --text: #e7ecf0;
    --muted: #94a2af;
    --accent: #22c3e6;
    --accent-strong: #5ad4ef;
    --accent-soft: #10303a;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; }
img { max-width: 100%; height: auto; }
a { color: var(--accent-strong); }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.015em; }
h1 { font-size: clamp(30px, 4.6vw, 52px); margin: 0 0 14px; }
h2 { font-size: clamp(24px, 3vw, 34px); margin: 0 0 12px; }
h3 { font-size: 19px; margin: 0 0 6px; }
.wrap { width: min(1160px, 100% - 32px); margin-inline: auto; }
.muted { color: var(--muted); }
.lead { font-size: 19px; color: var(--muted); max-width: 720px; }
.center { text-align: center; }
.center .lead { margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 99; background: var(--surface); padding: 8px 12px; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 22px; border-radius: 10px; font-weight: 650; text-decoration: none; border: 1px solid var(--border); color: var(--text); background: var(--surface); transition: transform 0.1s, background 0.15s; }
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn.ghost-light { color: #fff; border-color: rgba(255, 255, 255, 0.35); background: transparent; }
.btn.small { padding: 8px 14px; font-size: 15px; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.header-row { display: grid; grid-template-columns: 1fr auto 1fr; grid-template-areas: 'logo nav cta'; align-items: center; gap: 16px; min-height: 66px; }
.site-header .logo { grid-area: logo; justify-self: start; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--text); text-decoration: none; }
.site-nav { grid-area: nav; display: flex; align-items: center; justify-content: center; gap: 2px; }
.site-nav a:not(.btn) { color: var(--text); text-decoration: none; padding: 8px 12px; border-radius: 8px; font-size: 15px; font-weight: 550; white-space: nowrap; }
.site-nav a:not(.btn):hover, .site-nav a.active { background: var(--accent-soft); color: var(--accent-strong); }
.header-cta { grid-area: cta; justify-self: end; white-space: nowrap; }
.nav-cta-mobile { display: none !important; }
.menu-toggle { display: none; grid-area: toggle; justify-self: end; font-size: 22px; background: none; border: 1px solid var(--border); border-radius: 8px; width: 44px; height: 40px; color: var(--text); cursor: pointer; }

/* ---------- hero ---------- */
.hero { background: radial-gradient(1200px 500px at 70% -10%, #0f4c5f 0%, transparent 60%), linear-gradient(180deg, var(--dark) 0%, var(--dark-2) 100%); color: #eaf6fa; padding: 72px 0 0; overflow: hidden; }
.hero .lead { color: #b7d3dd; }
.hero h1 span { color: #5ad4ef; }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 40px; }
.hero-copy { max-width: 820px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.hero-badges span { font-size: 13px; padding: 5px 11px; border-radius: 99px; background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.14); color: #d4eef5; }
.shot { border-radius: 12px; border: 1px solid var(--border); box-shadow: 0 30px 70px rgba(5, 20, 30, 0.35); display: block; }
.hero .shot { border-color: rgba(255, 255, 255, 0.12); margin-bottom: -60px; }
.hero + section { padding-top: 110px; }

/* ---------- sections ---------- */
section { padding: 84px 0; }
section.soft { background: var(--bg-soft); }
.kicker { text-transform: uppercase; font-size: 13px; letter-spacing: 0.08em; font-weight: 700; color: var(--accent-strong); margin-bottom: 8px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.card p { margin: 6px 0 0; color: var(--muted); font-size: 16px; }
.icon { width: 42px; height: 42px; border-radius: 10px; background: var(--accent-soft); color: var(--accent-strong); display: grid; place-items: center; font-size: 21px; margin-bottom: 12px; }
.link-card { text-decoration: none; color: inherit; display: block; transition: border-color 0.15s, transform 0.1s; }
.link-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.split { display: grid; grid-template-columns: 1fr 1.25fr; gap: 48px; align-items: center; }
.split.reverse { grid-template-columns: 1.25fr 1fr; }
.split.reverse > :first-child { order: 2; }
.checks { list-style: none; padding: 0; margin: 18px 0 0; }
.checks li { padding-left: 30px; position: relative; margin: 10px 0; }
.checks li::before { content: '✓'; position: absolute; left: 0; top: 0; width: 20px; height: 20px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-strong); font-size: 13px; font-weight: 800; display: grid; place-items: center; margin-top: 3px; }
.steps-row { counter-reset: s; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.steps-row .card::before { counter-increment: s; content: counter(s); display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 800; margin-bottom: 12px; }
.strip { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 26px; color: var(--muted); font-weight: 600; font-size: 15px; }

/* ---------- pricing ---------- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.plan { display: flex; flex-direction: column; }
.plan.featured { border: 2px solid var(--accent); box-shadow: 0 18px 50px rgba(14, 165, 201, 0.15); }
.plan .price { font-size: 42px; font-weight: 800; margin: 8px 0 0; }
.plan .price small { font-size: 15px; font-weight: 500; color: var(--muted); }
.plan ul { margin: 16px 0 22px; flex: 1; }
.plan .btn { width: 100%; }
.badge { display: inline-block; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--accent-strong); }
table.compare { width: 100%; border-collapse: collapse; font-size: 15px; }
table.compare th, table.compare td { padding: 11px 12px; border-bottom: 1px solid var(--border); text-align: left; }
table.compare td:not(:first-child), table.compare th:not(:first-child) { text-align: center; }

/* ---------- FAQ ---------- */
details.faq { border-bottom: 1px solid var(--border); padding: 16px 4px; }
details.faq summary { cursor: pointer; font-weight: 650; font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
details.faq summary::after { content: '+'; color: var(--accent-strong); font-size: 22px; line-height: 1; }
details.faq[open] summary::after { content: '−'; }
details.faq p { color: var(--muted); margin: 10px 0 0; }

/* ---------- CTA ---------- */
.cta-band { background: linear-gradient(135deg, #0b87a5, #0e5d78); color: #fff; border-radius: 20px; padding: 48px; text-align: center; }
.cta-band .lead { color: #d9f2f8; margin-inline: auto; }
.cta-band .btn.primary { background: #fff; color: #0b6f88; border-color: #fff; }
.cta-box { margin: 48px 0 0; padding: 28px; border-radius: var(--radius); background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.cta-box p { color: var(--muted); }

/* ---------- articles and docs ---------- */
.doc { padding: 48px 0 80px; max-width: 820px; }
.crumbs { font-size: 14px; margin: 0 0 10px; }
.crumbs a { text-decoration: none; }
.meta { color: var(--muted); font-size: 14px; }
.tag { display: inline-block; font-size: 12px; padding: 2px 9px; margin-left: 6px; border-radius: 99px; background: var(--bg-soft); border: 1px solid var(--border); }
.toc { background: var(--bg-soft); border: 1px solid var(--border); border-radius: 12px; padding: 16px 22px; margin: 24px 0; font-size: 15px; }
.toc ol { margin: 8px 0 0; padding-left: 20px; columns: 2; column-gap: 32px; }
.toc a { text-decoration: none; }
.prose h2 { margin: 48px 0 12px; scroll-margin-top: 80px; }
.prose h3 { margin: 30px 0 8px; scroll-margin-top: 80px; }
.prose p, .prose li { color: color-mix(in srgb, var(--text) 88%, transparent); }
.prose img { border-radius: 10px; border: 1px solid var(--border); margin: 12px 0; }
.prose img.float-right { float: right; margin: 0 0 16px 24px; max-width: 42%; }
.prose pre { background: #0e1a22; color: #dbe9f0; padding: 16px 18px; border-radius: 10px; overflow-x: auto; font-size: 14px; line-height: 1.5; }
.prose code { font-family: var(--mono); font-size: 0.9em; }
.prose :not(pre) > code { background: var(--bg-soft); border: 1px solid var(--border); padding: 1px 6px; border-radius: 5px; }
.prose blockquote { margin: 18px 0; padding: 12px 18px; border-left: 4px solid var(--accent); background: var(--bg-soft); border-radius: 0 10px 10px 0; }
.table-scroll { overflow-x: auto; margin: 16px 0; border: 1px solid var(--border); border-radius: 10px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; }
.prose th, .prose td { padding: 9px 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.prose th { background: var(--bg-soft); }
.prose tr:last-child td { border-bottom: none; }

/* ---------- converter tool ---------- */
.tool { display: grid; gap: 20px; }
.tool label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 600; color: var(--muted); }
.tool input, .tool select { font: inherit; font-size: 16px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 9px; background: var(--surface); color: var(--text); }
.tool .row { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; }
.tool .row > label { flex: 1 1 160px; }
.results { width: 100%; border-collapse: collapse; font-size: 15px; }
.results th, .results td { padding: 9px 10px; border-bottom: 1px solid var(--border); text-align: left; }
.results td.v { font-family: var(--mono); }
.results tr.likely td { background: color-mix(in srgb, var(--ok) 12%, transparent); font-weight: 650; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tabs button { font: inherit; font-weight: 600; padding: 9px 16px; border-radius: 9px; border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer; }
.tabs button.on { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 48px 0 28px; margin-top: 40px; font-size: 15px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 24px; }
.footer-grid a:not(.logo) { display: block; color: var(--muted); text-decoration: none; margin: 6px 0; }
.footer-grid a:hover { color: var(--accent-strong); }
.legal { margin-top: 28px; font-size: 13px; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .grid-3, .plans, .steps-row { grid-template-columns: 1fr 1fr; }
  .split, .split.reverse { grid-template-columns: 1fr; gap: 28px; }
  .split.reverse > :first-child { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }

  section { padding: 56px 0; }
  .hero { padding-top: 48px; }
  .grid-3, .grid-2, .plans, .steps-row { grid-template-columns: 1fr; }
  .cta-band { padding: 32px 20px; }
  .toc ol { columns: 1; }
  .prose img.float-right { float: none; max-width: 70%; margin: 12px auto; display: block; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- lead form, checklist, print ---------- */
.lead-form { display: grid; gap: 10px; margin-top: 14px; }
.lead-form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 600; color: var(--muted); }
.lead-form input { font: inherit; padding: 11px 12px; border: 1px solid var(--border); border-radius: 9px; background: var(--surface); color: var(--text); }
.small { font-size: 13px; }
.checklist .prose li { list-style: none; margin-left: -18px; }
.checklist .fill-in { font-family: var(--mono); font-size: 14px; }
@media print {
  .site-header, .site-footer, .no-print, .cta-box, .toc { display: none !important; }
  body { font-size: 11pt; background: #fff; color: #000; }
  .doc { padding: 0; max-width: none; }
  .prose h2 { margin: 14px 0 6px; font-size: 14pt; break-after: avoid; }
  .prose li, .prose p { color: #000; margin: 3px 0; }
  .table-scroll { border: 1px solid #999; }
  a { color: #000; text-decoration: none; }
}

/* ---------- header: ☰ menu below 980px (no wrapping links) ---------- */
@media (max-width: 980px) {
  .header-row { grid-template-columns: 1fr auto; grid-template-areas: 'logo toggle'; }
  .menu-toggle { display: block; }
  .header-cta { display: none; }
  .site-nav { display: none; position: absolute; top: 66px; left: 0; right: 0; flex-direction: column; align-items: stretch; padding: 10px 16px 18px; background: var(--bg); border-bottom: 1px solid var(--border); box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08); }
  .site-nav.open { display: flex; }
  .site-nav a:not(.btn) { padding: 12px; }
  .nav-cta-mobile { display: inline-flex !important; margin-top: 8px; }
}