:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-strong: #eef3f8;
  --text: #18202a;
  --muted: #5d6978;
  --line: #d8e0e9;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --warning: #8a5a00;
  --shadow: 0 14px 35px rgba(31, 45, 61, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Arial, "Helvetica Neue", sans-serif;
  line-height: 1.55;
}

a {
  color: var(--accent-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header,
.site-footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 22px;
  font-weight: 700;
}

.brand:hover {
  text-decoration: none;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 14px;
}

.hero,
.section,
.document {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 76px);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 32px;
  align-items: center;
  padding: 44px 0 72px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(42px, 8vw, 86px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 12px;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: 0;
}

.lead {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 22px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 18px;
  font: inherit;
  font-weight: 700;
  background: var(--surface);
  color: var(--text);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.button.muted:disabled {
  color: var(--muted);
  cursor: not-allowed;
  opacity: 0.74;
}

.product-panel,
.pricing-box,
.seller-box,
.feature-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.product-panel {
  padding: 10px;
}

.panel-row,
.price-row {
  display: grid;
  gap: 8px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.panel-row:last-child,
.price-row:last-child {
  border-bottom: 0;
}

.panel-row span,
.price-row span,
dt {
  color: var(--muted);
  font-size: 14px;
}

.panel-row strong,
.price-row strong {
  font-size: 20px;
}

.section {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}

.section-head {
  max-width: 680px;
  margin-bottom: 22px;
}

.section-head p,
.section > p,
.document p,
.steps {
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  min-height: 138px;
  padding: 20px;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 1fr);
  gap: 28px;
  align-items: start;
}

.pricing-box {
  overflow: hidden;
}

.price-row strong {
  color: var(--accent-dark);
  font-size: 30px;
}

.note {
  display: inline-block;
  margin-top: 12px;
  color: var(--warning);
  font-weight: 700;
}

.steps {
  margin: 0;
  padding-left: 22px;
}

.steps li {
  margin: 0 0 8px;
}

.payment {
  background: var(--surface-strong);
  width: 100%;
  max-width: none;
  padding-left: max(16px, calc((100% - 1120px) / 2));
  padding-right: max(16px, calc((100% - 1120px) / 2));
}

.seller-box {
  padding: 20px;
}

dl {
  margin: 0;
}

dl div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

dl div:last-child {
  border-bottom: 0;
}

dd {
  margin: 0;
  font-weight: 700;
}

.document {
  max-width: 860px;
  padding: 44px 0 72px;
}

.document h1 {
  font-size: clamp(34px, 6vw, 58px);
}

.document section {
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

.doc-note {
  border-left: 4px solid var(--warning);
  padding: 12px 14px;
  background: #fff8e6;
}

.document-dl {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 18px;
  background: var(--surface);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding: 28px 0 38px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 0;
  }

  .top-nav {
    justify-content: flex-start;
    gap: 12px;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-top: 28px;
  }

  .lead {
    font-size: 18px;
  }

  .feature-grid,
  .split {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: 0;
  }

  .price-row strong {
    font-size: 24px;
  }

  dl div {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}