:root {
  --bg: #f4f7f8;
  --surface: #ffffff;
  --border: #dbe4e7;
  --text: #122026;
  --muted: #5a6c74;
  --accent: #0f766e;
  --accent-hover: #0c5f59;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(180deg, #f4f7f8 0%, #e8f0f2 100%);
  color: var(--text);
}

.container {
  width: min(1100px, 100% - 2rem);
  margin: 2rem auto;
  display: grid;
  gap: 1rem;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 2vw + 1rem, 2.1rem);
}

header p {
  margin: 0;
  color: var(--muted);
  max-width: 80ch;
  line-height: 1.5;
}

.meta {
  margin-top: 0.55rem;
}

.grid-two {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr 1fr;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

label {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

textarea {
  width: 100%;
  min-height: 320px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem;
  resize: vertical;
  font: 0.92rem/1.45 "JetBrains Mono", "Fira Code", Consolas, monospace;
  background: #fbfdfe;
  color: var(--text);
}

.bottom-panel textarea {
  min-height: 100px;
}

button {
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  font-weight: 600;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
}

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

button:active {
  transform: translateY(1px);
}

.hint {
  margin: 0.6rem 0 0;
  color: var(--muted);
  line-height: 1.4;
  font-size: 0.92rem;
}

code {
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
}

a {
  color: var(--accent);
}

a:hover {
  color: var(--accent-hover);
}

.footer {
  display: flex;
  justify-content: flex-end;
  padding: 0.2rem 0.1rem 0;
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  .grid-two {
    grid-template-columns: 1fr;
  }

  textarea {
    min-height: 240px;
  }

  .footer {
    justify-content: flex-start;
  }
}