:root {
  --bg: #f8fbfa;
  --panel: #ffffff;
  --text: #101816;
  --muted: #5e6a66;
  --line: #dfe9e5;
  --accent: #10b981;
  --accent-dark: #047857;
  --soft: #ecfdf5;
  --radius: 22px;
  --shadow: 0 18px 50px rgba(6, 78, 59, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 0%, #d1fae5 0, transparent 34%), var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
}

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

.skip {
  position: absolute;
  left: -999px;
  top: 12px;
  background: var(--text);
  color: white;
  padding: 10px 14px;
  border-radius: 999px;
  z-index: 10;
}

.skip:focus {
  left: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(16px);
  background: rgba(248, 251, 250, 0.84);
  border-bottom: 1px solid rgba(223, 233, 229, 0.8);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  font-weight: 850;
  text-decoration: none;
  letter-spacing: -0.04em;
  font-size: 22px;
}

.lang-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.lang-nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 9px;
  background: rgba(255, 255, 255, 0.7);
}

.lang-nav a[aria-current="page"] {
  color: var(--text);
  border-color: var(--accent);
  background: var(--soft);
}

.hero {
  padding: 76px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 34px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  border: 1px solid #a7f3d0;
  color: var(--accent-dark);
  background: var(--soft);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 18px;
}

h1 {
  font-size: clamp(42px, 7vw, 78px);
  line-height: 0.95;
  letter-spacing: -0.075em;
  margin: 0;
}

.lead {
  font-size: clamp(18px, 2vw, 22px);
  color: var(--muted);
  max-width: 760px;
  margin: 24px 0 0;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
  border: 1px solid var(--line);
  background: white;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--text);
  color: white;
  border-color: var(--text);
}

.btn-secondary:hover,
.btn-primary:hover {
  transform: translateY(-1px);
}

.trust-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.hero-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
}

.hero-card strong {
  display: block;
  font-size: 22px;
  letter-spacing: -0.04em;
  margin-bottom: 10px;
}

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

.section {
  padding: 52px 0;
}

.section.alt {
  background: rgba(255, 255, 255, 0.52);
  border-top: 1px solid rgba(223, 233, 229, 0.8);
  border-bottom: 1px solid rgba(223, 233, 229, 0.8);
}

.section h2 {
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.05;
  letter-spacing: -0.06em;
  margin: 0 0 18px;
}

.section-intro {
  max-width: 820px;
  color: var(--muted);
  margin: 0 0 24px;
  font-size: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.card,
.faq-item,
.exchange-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 10px 30px rgba(6, 78, 59, 0.04);
}

.card h3,
.faq-item h3 {
  margin: 0 0 10px;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.card p,
.faq-item p,
.exchange-box p {
  margin: 0;
  color: var(--muted);
}

.exchange-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 12px;
}

.checklist li {
  background: white;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
}

.checklist li::before {
  content: "✓";
  color: var(--accent-dark);
  font-weight: 900;
  margin-right: 10px;
}

.keyword-line {
  color: var(--muted);
  border-left: 4px solid var(--accent);
  background: var(--soft);
  border-radius: 16px;
  padding: 16px 18px;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 24px;
}

.site-footer {
  padding: 34px 0 46px;
  color: var(--muted);
}

.site-footer .small {
  font-size: 14px;
}

@media (max-width: 820px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .hero {
    padding-top: 46px;
  }

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

  .exchange-box {
    align-items: flex-start;
    flex-direction: column;
  }

  h1 {
    letter-spacing: -0.06em;
  }
}