:root {
  --bg: #080c18;
  --panel: #11182b;
  --panel-2: #0d1324;
  --text: #f5f7ff;
  --muted: #9da8c0;
  --line: rgba(255,255,255,.10);
  --accent: #7c5cff;
  --accent-2: #24d6b3;
  --danger: #ff7185;
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, rgba(124,92,255,.20), transparent 34rem),
    radial-gradient(circle at 85% 20%, rgba(36,214,179,.12), transparent 30rem),
    var(--bg);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

.topbar {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -.5px;
}
.brand span:last-child span { color: var(--accent-2); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 900;
}

nav { display: flex; gap: 22px; color: var(--muted); font-size: 14px; }
nav a:hover { color: white; }

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

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: 1fr 470px;
  align-items: center;
  gap: 70px;
  padding: 70px 0;
}

.eyebrow {
  display: inline-block;
  color: var(--accent-2);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.7px;
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(42px, 6vw, 72px);
  line-height: .98;
  letter-spacing: -4px;
  margin: 0 0 24px;
}
h1 span { color: var(--accent-2); }
.hero-copy p { color: var(--muted); font-size: 18px; line-height: 1.6; max-width: 560px; }

.converter-card {
  background: linear-gradient(180deg, rgba(20,29,50,.96), rgba(12,18,34,.96));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: 0 30px 80px rgba(0,0,0,.35);
}

.field { display: flex; flex-direction: column; gap: 8px; }
label { font-size: 12px; color: var(--muted); font-weight: 700; }
input, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--panel-2);
  color: var(--text);
  padding: 14px 13px;
  outline: none;
  font: inherit;
}
input:focus, select:focus { border-color: var(--accent); }

.currency-row {
  display: grid;
  grid-template-columns: 1fr 48px 1fr;
  align-items: end;
  gap: 10px;
  margin-top: 18px;
}

.swap {
  height: 47px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #171f35;
  color: white;
  cursor: pointer;
  font-size: 21px;
}
.swap:hover { border-color: var(--accent); }

.primary {
  width: 100%;
  margin-top: 18px;
  padding: 15px;
  border: 0;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--accent), #5f86ff);
  color: white;
  font-weight: 800;
  cursor: pointer;
  font-size: 15px;
}
.primary:hover { filter: brightness(1.08); }

.status { min-height: 21px; margin-top: 10px; color: var(--muted); font-size: 12px; }
.status.error { color: var(--danger); }

.result {
  margin-top: 14px;
  padding: 20px;
  border-radius: 16px;
  background: rgba(255,255,255,.045);
  border: 1px solid var(--line);
}
.result span, .result small { display: block; color: var(--muted); }
.result strong { display: block; font-size: 34px; margin: 7px 0; letter-spacing: -.8px; }

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 10px 0 90px;
}
.info-grid article, .about {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.025);
  border-radius: 18px;
  padding: 25px;
}
.icon { font-size: 24px; }
h2 { margin: 12px 0 8px; font-size: 20px; }
.info-grid p, .about p { color: var(--muted); line-height: 1.6; margin: 0; }
.about { margin-bottom: 80px; }
.about h2 { margin-top: 0; }
.about .source { margin-top: 12px; font-size: 12px; }

footer {
  width: min(1120px, calc(100% - 32px));
  margin: auto;
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}

@media (max-width: 850px) {
  .hero { grid-template-columns: 1fr; gap: 30px; padding: 45px 0 70px; }
  h1 { letter-spacing: -2.5px; }
  .info-grid { grid-template-columns: 1fr; padding-bottom: 60px; }
}

@media (max-width: 560px) {
  .topbar { padding: 16px 0; }
  nav { display: none; }
  .hero { min-height: auto; }
  .currency-row { grid-template-columns: 1fr; }
  .swap { width: 100%; transform: rotate(90deg); }
  .converter-card { padding: 18px; }
  footer { flex-direction: column; gap: 8px; }
}