:root {
  color-scheme: dark;
  --bg: #101417;
  --panel: #171d21;
  --text: #edf4f2;
  --muted: #9cb0aa;
  --line: rgba(255, 255, 255, 0.1);
  --accent: #3ddc97;
  --accent-strong: #23b879;
  --danger: #ff7777;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: linear-gradient(180deg, #101417 0%, #192126 100%);
  font-family: Inter, Segoe UI, Arial, sans-serif;
}

.shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 54px;
}

.hero {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1;
}

.subtext {
  max-width: 620px;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border: 1px solid rgba(61, 220, 151, 0.25);
  border-radius: 999px;
  background: rgba(61, 220, 151, 0.1);
  font-weight: 800;
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.8fr);
  gap: 18px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(23, 29, 33, 0.92);
  padding: 18px;
}

label {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--muted);
  font-weight: 800;
}

input,
textarea,
button {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

input,
textarea {
  color: var(--text);
  background: #0f1518;
  padding: 12px;
}

textarea {
  resize: vertical;
}

button {
  min-height: 46px;
  border-color: transparent;
  color: #06100c;
  background: var(--accent);
  font-weight: 900;
  cursor: pointer;
}

button:hover {
  background: var(--accent-strong);
}

.split {
  display: grid;
  grid-template-columns: 1fr 140px;
  gap: 12px;
}

.preview h2 {
  margin-bottom: 10px;
}

.price-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.buttons {
  display: grid;
  gap: 8px;
  margin: 16px 0;
}

.buttons span {
  display: block;
  padding: 11px 12px;
  border: 1px solid rgba(61, 220, 151, 0.28);
  border-radius: 8px;
  text-align: center;
  color: var(--accent);
  background: rgba(61, 220, 151, 0.08);
  font-weight: 800;
}

pre {
  min-height: 120px;
  margin: 0;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  color: var(--muted);
  background: #0f1518;
  white-space: pre-wrap;
}

.error {
  color: var(--danger);
}

@media (max-width: 820px) {
  .hero,
  .grid,
  .split {
    grid-template-columns: 1fr;
  }

  .hero {
    display: grid;
    align-items: start;
  }
}