:root {
  --bg: #f6f3ee;
  --card: #ffffff;
  --text: #1b1b1b;
  --muted: #5a5a5a;
  --accent: #0d1b2a;
  --accent-2: #d39d2a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Serif 4", "Georgia", serif;
  background: radial-gradient(circle at top, #ffffff 0%, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 32px 16px;
}

.card {
  background: var(--card);
  max-width: 640px;
  width: 100%;
  padding: 32px;
  border-radius: 18px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.logo {
  width: 140px;
  height: auto;
  display: block;
  margin-bottom: 16px;
}

h1,
h2 {
  margin: 0 0 16px;
  font-weight: 600;
}

.intro {
  margin: 0 0 24px;
  color: var(--muted);
}

label {
  font-weight: 600;
  display: block;
  margin-bottom: 8px;
}

textarea,
input[type="text"],
input[type="range"] {
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.15);
  font-size: 1rem;
  font-family: inherit;
}

input[type="range"] {
  padding: 0;
}

textarea {
  resize: vertical;
}

.btn {
  margin-top: 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}

.btn:hover {
  background: #081220;
}

.result {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px dashed rgba(0, 0, 0, 0.2);
}

.field {
  margin-top: 16px;
}

.range-value {
  margin-top: 8px;
  color: var(--muted);
}

.hidden {
  display: none;
}

.warning {
  color: #7b2b00;
  font-weight: 600;
}

.note {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 12px;
}

.secret {
  width: 100%;
  margin-top: 8px;
  font-family: "Courier New", monospace;
}

@media (max-width: 600px) {
  .card {
    padding: 24px;
  }
}