html {
  font-size: 16px; 
}

body {
  font-family: Arial, sans-serif;
  background-color: white;
  color: black;
  margin: 0;
  transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
  background-color: #1e1e1e;
  color: #f5f5f5;
}

.container {
  max-width: 900px;
  margin: 40px auto 0 auto;
  padding: 40px 24px;
  text-align: center;
}

h1 {
  color: inherit;
}

p {
    color: inherit;
    font-weight: 500;
}

img {
  max-width: 280px;
  display: block;
  margin: 16px auto;
}

.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin: 24px 0;
}

button {
  padding: 12px 24px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background-color: #0056b3;
  color: #ffffff;
  transition: background-color 0.3s;
}

button:focus,
button:focus-visible {
  outline: 3px solid #ff9900;
  outline-offset: 2px;
}


.controls .tooltip-btn:hover {
  background-color: #004494;
}

.top-toggle {
  position: fixed;
  top: 80px;
  right: 80px;
  z-index: 1000;
}

.mode-btn {
  position: relative;
  width: 50px;
  height: 50px;
  padding: 0;
  border-radius: 50%;
  background-color: #0a0a07;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 24px;
  transition: transform 0.2s, background-color 0.3s; 
}

.mode-btn:hover,
.mode-btn:focus-visible {
  transform: scale(1.05); 
  background-color: #007BFF;
}

body.dark-mode .mode-btn {
  background-color: #c2c2c2;
}

body.dark-mode .mode-btn:hover,
body.dark-mode .mode-btn:focus-visible {
  background-color: #f7f7f7;
}

.mode-btn .icon {
  font-size: 24px; 
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}


.tooltip-btn {
  position: relative;
}

.tooltip-text {
  visibility: hidden;
  opacity: 0;
  width: max-content;
  max-width: 90vw;
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 6px 10px;
  border-radius: 4px;
  position: absolute;
  z-index: 10;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1rem; 
  pointer-events: none;
  white-space: nowrap;
  box-sizing: border-box;
  transition: opacity 0.3s;
}

.tooltip-text::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: #333 transparent transparent transparent;
}


.tooltip-btn:hover .tooltip-text,
.tooltip-btn:focus-visible .tooltip-text {
  visibility: visible;
  opacity: 1;
}


.tooltip-btn:active .tooltip-text {
  visibility: hidden;
  opacity: 0;
}


body.dark-mode .tooltip-text {
  background-color: #f5f5f5;
  color: #1e1e1e;
}

body.dark-mode .tooltip-text::after {
  border-color: #f5f5f5 transparent transparent transparent;
}