:root {
  /* === Dark mode (default) === */
  --bg-body: #000;
  --bg-app: #111;
  --bg-panel: #222;
  --text-primary: seagreen;
  --border-color: #333;
  --button-bg: seagreen;
  --button-text: #222;
  --focus-glow: rgba(0, 255, 0, 0.2);
}

body.light {
  /* === Light mode overrides === */
  --bg-body: #ffffff;
  --bg-app: #f8f8f8;
  --bg-panel: #e8e8e8;
  --text-primary: #006400; /* dark green */
  --border-color: #ccc;
  --button-bg: #2e8b57; /* forest green */
  --button-text: #ffffff;
  --focus-glow: rgba(46, 139, 87, 0.2); /* darker green glow */
}

body {
  margin: 0;
  padding: 20px;
  background-color: var(--bg-body);
  color: var(--text-primary);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

#app {
  width: 90%;
  max-width: 600px;
  margin: 40px auto;
  background-color: var(--bg-app);
  padding: 24px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  box-shadow: 0 0 10px var(--focus-glow);
  text-align: center;
}

.password {
  background-color: var(--bg-panel);
  padding: 12px;
  margin: 10px 0;
  border-radius: 4px;
  word-break: break-all;
  color: var(--text-primary); /* explicit, though inherited */
}

button {
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  padding: 10px 20px;
  font-family: monospace;
  font-weight: bold;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 20px;
}

#lengthInput {
  background-color: var(--bg-panel);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 8px 10px;
  font-family: monospace;
  font-size: 16px;
  width: 80px;
  text-align: center;
  margin: 0;
}

#lengthInput:focus {
  outline: none;
  border-color: var(--button-bg);
  box-shadow: 0 0 0 2px var(--focus-glow);
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--button-bg);
  margin-right: 6px;
}

#container label,
.options label {
  font-family: monospace;
  color: var(--text-primary);
  /* ... other props unchanged */
}

/* Hide spin buttons */
#lengthInput::-webkit-outer-spin-button,
#lengthInput::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}


/* Group spacing */
#container,
.options,
.password,
button {
  margin-bottom: 1.2rem; /* ~20px, but scalable */
}

/* Remove extra margin on last button */
button:last-of-type {
  margin-bottom: 0;
}


button,
#lengthInput {
  padding: 10px 16px; /* more balanced horizontal padding */
  font-size: 1rem;
  height: auto; /* let padding define height */
}

button:hover {
  filter: brightness(1.1);
  transition: filter 0.2s;
}

#lengthInput:hover {
  border-color: var(--button-bg);
}

button:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--focus-glow);
}

input[type="checkbox"]:focus {
  outline: 2px solid var(--focus-glow);
  border-radius: 4px;
}

body {
  transition: background-color 0.3s, color 0.3s;
}

#app, .password, button, #lengthInput {
  transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s;
}

#themeToggle {
    padding-top: 8px;
}