:root {
  --bg: #1f2430;
  --panel: #252b38;
  --text: #f3f6f4;
  --muted: #c9d3cd;
  --green: #4dd45f;
  --green-dark: #1f9f3b;
  --line: rgba(77, 212, 95, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 72% 28%, rgba(77, 212, 95, 0.16), transparent 36%),
    linear-gradient(135deg, #191f2b 0%, #1f2430 48%, #16291f 100%);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px;
  border-bottom: 3px solid var(--green);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
}

.brand-mark {
  display: inline-grid;
  width: 54px;
  height: 54px;
  place-items: center;
  border: 1px solid rgba(77, 212, 95, 0.55);
  border-radius: 16px;
  color: #061008;
  background: linear-gradient(135deg, #b9ffd0 0%, var(--green) 52%, #178f35 100%);
  box-shadow: 0 0 24px rgba(77, 212, 95, 0.28);
  font-weight: 900;
}

.nav {
  display: flex;
  gap: 22px;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.top-button,
.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
}

.top-button,
.primary-button {
  color: #061008;
  background: var(--green);
}

.secondary-button {
  color: var(--green);
  border: 1px solid var(--green);
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 54px 24px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(460px, 1.22fr);
  gap: 44px;
  align-items: center;
}

.hero-copy {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 36px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--green);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: 42px;
  line-height: 1.05;
}

.summary {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.notice {
  padding: 14px 16px;
  border: 1px solid rgba(77, 212, 95, 0.38);
  border-radius: 14px;
  color: #e8f7eb;
  background: rgba(77, 212, 95, 0.08);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  overflow: hidden;
  border: 1px solid rgba(77, 212, 95, 0.28);
  border-radius: 14px;
  background: rgba(77, 212, 95, 0.18);
}

.quick-facts div {
  min-height: 76px;
  padding: 14px;
  background: rgba(7, 14, 10, 0.45);
}

.quick-facts strong,
.quick-facts span {
  display: block;
}

.quick-facts strong {
  color: var(--text);
  font-size: 14px;
}

.quick-facts span {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.3;
}

.hero-media {
  min-height: 620px;
  display: grid;
  align-items: center;
}

.guide-panel {
  min-height: 560px;
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background:
    radial-gradient(circle at 72% 12%, rgba(77, 212, 95, 0.32), transparent 30%),
    linear-gradient(145deg, rgba(7, 14, 10, 0.85), rgba(37, 43, 56, 0.88));
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.32);
}

.panel-label {
  margin: 0 0 18px;
  color: var(--green);
  font-weight: 900;
  text-transform: uppercase;
}

.guide-panel h2 {
  max-width: 620px;
  margin: 0;
  font-size: 44px;
  line-height: 1.08;
}

.intent-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 36px 0;
  padding: 0;
  list-style: none;
}

.intent-list li {
  min-height: 86px;
  padding: 18px;
  border: 1px solid rgba(77, 212, 95, 0.28);
  border-radius: 16px;
  color: var(--muted);
  background: rgba(7, 14, 10, 0.42);
}

.panel-button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  padding: 0 28px;
  border-radius: 999px;
  color: #061008;
  background: var(--green);
  font-weight: 900;
  text-decoration: none;
}

.content-block {
  margin-top: 42px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.035);
}

.section-label {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.content-block h2 {
  margin: 0 0 10px;
  color: var(--green);
}

.content-block p {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.7;
}

.content-block p:last-child {
  margin-bottom: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.feature-grid article {
  min-height: 160px;
  padding: 20px;
  border: 1px solid rgba(77, 212, 95, 0.26);
  border-radius: 14px;
  background: rgba(7, 14, 10, 0.36);
}

.feature-grid h3 {
  margin: 0 0 10px;
  color: var(--text);
}

.version-table {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: hidden;
  margin-top: 18px;
  border: 1px solid rgba(77, 212, 95, 0.28);
  border-radius: 14px;
}

.version-table div {
  min-height: 86px;
  padding: 16px;
  border-right: 1px solid rgba(77, 212, 95, 0.22);
  border-bottom: 1px solid rgba(77, 212, 95, 0.22);
  background: rgba(7, 14, 10, 0.28);
}

.version-table strong,
.version-table span {
  display: block;
}

.version-table strong {
  color: var(--text);
}

.version-table span {
  margin-top: 8px;
  color: var(--muted);
}

.step-list {
  margin: 18px 0 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.75;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.faq-list details {
  padding: 16px 18px;
  border: 1px solid rgba(77, 212, 95, 0.26);
  border-radius: 14px;
  background: rgba(7, 14, 10, 0.3);
}

.faq-list summary {
  cursor: pointer;
  color: var(--text);
  font-weight: 800;
}

.faq-list p {
  margin-top: 12px;
}

@media (max-width: 860px) {
  .site-header,
  .nav {
    flex-wrap: wrap;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 34px;
  }

  .quick-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .feature-grid,
  .version-table,
  .intent-list {
    grid-template-columns: 1fr;
  }

  .hero-media {
    min-height: auto;
  }

  .guide-panel {
    min-height: auto;
    padding: 28px;
  }

  .guide-panel h2 {
    font-size: 32px;
  }
}