:root {
  color-scheme: light;
  --bg: #0f0f0f;
  --panel: #171717;
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #f4f4f4;
  --muted: #a3a3a3;
  --accent: #e8ff4a;
  --danger: #ff6b6b;
  --ok: #7dffb3;
  --font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(232, 255, 74, 0.12), transparent 35%),
    linear-gradient(180deg, #121212, #0a0a0a);
  color: var(--text);
  font-family: var(--font);
}

.shell {
  width: min(720px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.hero {
  margin-bottom: 1.5rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.03em;
}

.lede,
.hint {
  color: var(--muted);
  line-height: 1.5;
}

.card {
  margin-bottom: 1rem;
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--panel-border);
  background: rgba(23, 23, 23, 0.92);
  backdrop-filter: blur(8px);
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.8rem;
}

input {
  width: 100%;
  margin-bottom: 0.75rem;
  padding: 0.75rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: #0d0d0d;
  color: var(--text);
  font: inherit;
}

button,
.button-link {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 0.95rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #111;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.05);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.actions button:nth-child(3),
.actions button:nth-child(4) {
  background: transparent;
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.25);
}

pre,
code {
  display: block;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.45;
}

pre {
  margin: 0;
  padding: 0.85rem;
  background: #0d0d0d;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.result {
  margin-top: 0.85rem;
}

code {
  padding: 0.7rem 0.8rem;
  background: #0d0d0d;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

@media (max-width: 640px) {
  .actions button {
    width: 100%;
  }
}