:root {
  --bg: #f0f0f0;
  --text: #111;
  --key-bg: #fff;
  --key-border: #ccc;
  --key-hover: #ddd;
}

body.dark {
  --bg: #1e1e1e;
  --text: #eee;
  --key-bg: #333;
  --key-border: #555;
  --key-hover: #444;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Vazir', Tahoma, Arial, sans-serif;
  max-width: 900px;
  margin: 30px auto;
  padding: 20px;
  transition: background 0.3s, color 0.3s;
  direction: rtl;
}

.keyboard, textarea {
  font-family: 'Vazir', Tahoma, Arial, sans-serif;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

textarea {
  width: 100%;
  height: 150px;
  font-size: 18px;
  padding: 10px;
  margin: 20px 0 10px 0;
  border-radius: 6px;
  border: 1px solid var(--key-border);
  background: var(--key-bg);
  color: var(--text);
  direction: rtl;
  resize: vertical;
}

button {
  padding: 10px 16px;
  font-size: 14px;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 20px;
}

.keyboard {
  display: flex;
  flex-direction: column;
  gap: 8px;
  user-select: none;
  direction: ltr;
}

.keyboard-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.key {
  background: var(--key-bg);
  border: 1px solid var(--key-border);
  border-radius: 6px;
  padding: 12px 10px;
  min-width: 40px;
  font-size: 18px;
  text-align: center;
  cursor: pointer;
  transition: background 0.2s;
  user-select: none;
  box-sizing: border-box;
  line-height: 1;
  white-space: nowrap;
}

.key:hover {
  background: var(--key-hover);
}

.key.wide {
  min-width: 80px;
}

.key.space {
  min-width: 280px;
}

.key.active {
  background: #4caf50;
  color: white;
}

.key.tab {
  min-width: 60px;
}

.key.capslock {
  min-width: 90px;
}

.key.enter {
  min-width: 90px;
}

.key.shift {
  min-width: 110px;
}

.key.ctrl, .key.alt {
  min-width: 60px;
}

.key.arrow {
  min-width: 50px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
  vertical-align: middle;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
  pointer-events: none;
}

.slider {
  position: relative;
  cursor: pointer;
  background-color: #ccc;
  border-radius: 34px;
  transition: background-color 0.4s ease;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.15);
}

.slider:before {
  content: "";
  position: absolute;
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  transition: transform 0.4s ease;
  z-index: 2;
}

/* Move the knob to the right when checked */
input:checked + .slider:before {
  transform: translateX(26px);
}

/* Background color when checked */
input:checked + .slider {
  background-color: #4a90e2;
  box-shadow: 0 2px 10px rgba(74, 144, 226, 0.6);
}

/* Sun and Moon icons inside the slider */
.slider .icon {
  font-size: 18px;
  pointer-events: none;
  user-select: none;
  width: 20px;
  line-height: 1;
  opacity: 0.7;
  transition: opacity 0.4s ease;
}

.slider .sun {
  color: #f39c12;
  margin-left: 4px;
}

.slider .moon {
  color: #f1c40f;
  margin-left: auto;
  margin-right: 4px;
}

/* Show sun when unchecked */
input:not(:checked) + .slider .sun {
  opacity: 1;
}

/* Hide sun when checked */
input:checked + .slider .sun {
  opacity: 0.3;
}

/* Show moon when checked */
input:checked + .slider .moon {
  opacity: 1;
}

/* Hide moon when unchecked */
input:not(:checked) + .slider .moon {
  opacity: 0.3;
}

textarea, input {
  caret-color: #4a90e2; /* bright blue caret */
}

#copyBtn {
  background-color: #1a73e8; /* Strong blue */
  color: #ffffff;            /* White text */
  border: none;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

#copyBtn:hover {
  background-color: #1558b0;
}