:root {
  --bg: #f3efe6;
  --paper: rgba(255, 252, 246, 0.9);
  --ink: #182028;
  --muted: #5f6770;
  --line: rgba(24, 32, 40, 0.12);
  --accent: #bd3f1d;
  --accent-soft: #f6c8a5;
  --shadow: 0 18px 50px rgba(53, 38, 25, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(189, 63, 29, 0.12), transparent 28%),
    radial-gradient(circle at right, rgba(30, 80, 140, 0.12), transparent 22%),
    linear-gradient(180deg, #fbf8f2, var(--bg));
}

.shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero {
  padding: 16px 8px 28px;
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  margin: 0;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
  line-height: 0.95;
}

.lede {
  max-width: 720px;
  margin: 14px 0 0;
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--muted);
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.composer {
  padding: 20px;
}

label {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  margin-bottom: 10px;
  font-size: 0.9rem;
}

textarea,
.output,
.case-card pre {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.92rem;
}

textarea {
  min-height: 200px;
  padding: 16px;
  resize: vertical;
}

.actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  background: var(--accent);
  color: white;
  cursor: pointer;
  font-weight: 700;
}

button.ghost {
  background: white;
  color: var(--ink);
  border: 1px solid var(--line);
}

.hint,
.status {
  margin: 14px 0 0;
  color: var(--muted);
}

.status {
  min-height: 1.4em;
}

.grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  margin-top: 18px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 20px 0;
}

.badge {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.84rem;
  color: var(--accent);
}

.cards {
  padding: 20px;
  display: grid;
  gap: 14px;
}

.case-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.75);
}

.case-card h3 {
  margin-bottom: 12px;
  font-size: 0.96rem;
}

.case-card pre,
.output {
  margin: 0;
  padding: 16px;
  overflow: auto;
}

.output {
  min-height: 560px;
  margin: 20px;
}

@media (max-width: 860px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .output {
    min-height: 320px;
  }
}