/* UO-inspired palette: green #154733, yellow #FEE123. System font stack
   only — no external font requests, keeps the page fully self-contained. */
:root {
  --uo-green: #154733;
  --uo-green-dark: #0d2e21;
  --uo-yellow: #fee123;
  --bg: #f5f6f4;
  --panel: #ffffff;
  --text: #1a1a1a;
  --muted: #5a615c;
  --border: #d9dcd8;
  --error: #b3261e;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--uo-green);
  border-bottom: 4px solid var(--uo-yellow);
  padding: 1.25rem 1.5rem;
}

header h1 {
  max-width: 720px;
  margin: 0 auto;
  color: #fff;
  font-size: 1.35rem;
  font-weight: 700;
}

main {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  width: 100%;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

textarea,
input[type="text"] {
  width: 100%;
  padding: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input[type="text"] {
  margin-bottom: 1.25rem;
}

textarea:focus,
input[type="text"]:focus {
  outline: 2px solid var(--uo-green);
  outline-offset: 1px;
}

.actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  gap: 1rem;
}

.char-hint {
  color: var(--muted);
  font-size: 0.8rem;
}

button {
  background: var(--uo-green);
  color: #fff;
  border: none;
  padding: 0.65rem 1.4rem;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background 0.15s ease;
}

button:hover {
  background: var(--uo-green-dark);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

/* Used for the "Copy" button, which sits on the dark result-box
   background (see below) rather than the page background, so it needs
   light-on-dark styling instead of button's default green-on-white. */
button.secondary {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  text-transform: none;
  letter-spacing: normal;
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
}

button.secondary:hover {
  background: var(--uo-yellow);
  color: var(--uo-green-dark);
  border-color: var(--uo-yellow);
}

#result {
  margin-top: 1.5rem;
}

.result-box {
  border-top: 3px solid var(--uo-yellow);
  background: var(--uo-green-dark);
  border-radius: 8px;
  padding: 1rem;
}

.result-box .result-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.result-box .result-head span {
  color: var(--uo-yellow);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

pre {
  margin: 0;
  padding: 0.9rem;
  background: #0a1f16;
  color: #f2f2f2;
  border-radius: 6px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-all;
}

.error-box {
  border-top: 3px solid var(--error);
  background: #fdecea;
  color: var(--error);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
}

footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem 2rem;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
}