* {
  box-sizing: border-box;
}


:root {
  --primary-color: #2b2b2b;
  --secondary-color: #777;
  --bg-color: #00c2f2;
  --font-color: #424242;
  --heading-color: #282828;
  --post-bg: #ffffff;
  --loader-overlay: rgba(255, 255, 255, 0.5);
  --loader-border: #ccc;
  --loader-top: #777;
}

[data-theme="dark"] {
  --primary-color: #d9d9d9;
  --secondary-color: #818181;
  --bg-color: #151515;
  --font-color: #e1e1e1;
  --heading-color: #9AAEC2;
  --post-bg: #272a30;
  --loader-overlay: rgba(0, 0, 0, 0.5);
  --loader-border: #4E5D6C;
  --loader-top: #9AAEC2;
}


body {
  margin: 0;
  padding: 0;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  background-color: var(--bg-color);
  color: var(--font-color);
  transition: background-color 0.5s ease, color 0.5s ease;
  max-width: 90%;
  margin: 0 auto;
}


nav {
  display: flex;
  justify-content: flex-end;
  padding: 20px 0;
}


.container {
  max-width: 750px;
  padding: 0 1rem;
  margin: 1.5rem auto;
  font-size: 1rem;
  min-height: 120vh;
  transition: color 0.3s ease, background-color 0.3s ease;
}

.post {
  background-color: var(--post-bg);
  padding: 25px;
  border-radius: 8px;
  margin-bottom: 20px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--secondary-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.post h3 {
  color: var(--heading-color);
  margin-top: 0;
  margin-bottom: 10px;
  transition: color 0.3s ease;
}

.post p {
  color: var(--font-color);
  line-height: 1.6;
}


.loader-box {
  position: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  bottom: 0;
  width: 100%;
  height: 100%;
  background-color: var(--loader-overlay);
  transition: background-color 0.3s ease;
}

.loader-box.hidden {
  display: none;
}

.circle {
  border: 15px solid var(--loader-border);
  border-radius: 50%;
  border-top: 15px solid var(--loader-top);
  width: 100px;
  height: 100px;
  animation: spin 1.5s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}


.checkbox {
  position: absolute;
  opacity: 0;
}

.label {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 50px;
  height: 25px;
  padding: 5px;
  border-radius: 50px;
  background-color: #111;
  transform: scale(1.3);
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.ball {
  position: absolute;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: white;
  transition: transform 0.25s ease, background-color 0.25s ease;
}

#checkbox:checked + .label .ball {
  background-color: #000;
  transform: translateX(24px);
}

#checkbox:checked + .label {
  background-color: #878787;
}

.label .fa-moon {
  color: rgb(249, 111, 13);
}

.label .fa-sun {
  color: yellow;
}