:root {
  color-scheme: light;
  --bg: #f1eee6;
  --paper: #fffdf7;
  --line: #d8cfbe;
  --ink: #1f1b16;
  --muted: #6d6254;
  --accent: #9f3a22;
  --accent-strong: #7e2310;
}

* {
  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(159, 58, 34, 0.12), transparent 35%),
    linear-gradient(135deg, #f7f3ea, var(--bg));
  min-height: 100vh;
}

.layout {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
}

.card {
  width: min(760px, 100%);
  background: rgba(255, 253, 247, 0.94);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 20px 50px rgba(55, 40, 20, 0.12);
}

h1 {
  margin: 0 0 8px;
  font-family: "Iowan Old Style", "Palatino Linotype", serif;
  font-size: clamp(2rem, 4vw, 3rem);
}

.lead {
  margin: 0 0 20px;
  color: var(--muted);
}

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

.tabs,
.row {
  display: flex;
  gap: 12px;
}

.tabs {
  margin-bottom: 16px;
}

button,
.tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  font: inherit;
  transition:
    background-color 160ms ease,
    color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

button {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  transform: translateY(-1px);
}

.tab {
  background: transparent;
  color: var(--ink);
}

.tab:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.panel {
  display: none;
  gap: 12px;
}

.panel.active {
  display: grid;
}

.tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

label {
  display: grid;
  gap: 6px;
  font-size: 0.95rem;
}

input,
textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

textarea {
  resize: vertical;
}

input[readonly],
textarea[readonly] {
  background: #f7f3ea;
}

.output {
  min-height: 24px;
  color: var(--muted);
  word-break: break-word;
}

@media (max-width: 640px) {
  .card {
    padding: 18px;
  }

  .tabs,
  .row {
    flex-direction: column;
  }
}