/* Variables */
:root {
  --bg-color-light: #f5f5f5;
  --text-color-light: #333;
  --bg-color-dark: #1e1e1e;
  --text-color-dark: #ddd;
  --primary-color: #2d74da;
  --secondary-color: #2565ae;
  --button-hover-light: #1f4e7c;
  --button-hover-dark: #17436b;
  --champions-league-color: #204798; /* Blue */
  --europa-league-color: #c85a00; /* Orange */
  --conference-league-color: #1d8053; /* Green */
  --font-family: "Poppins", sans-serif;
  --transition-duration: 0.3s;
  --transition-easing: ease;
  --container-max-width: 600px;
  --card-bg: #ffffff;
  --card-bg-dark: #2b2b2b;
  --card-border-radius: 12px;
  --card-box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

/* Global Styles */
body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--bg-color-light);
  color: var(--text-color-light);
  transition: background-color var(--transition-duration)
      var(--transition-easing),
    color var(--transition-duration) var(--transition-easing);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  padding: 1rem;
  overflow-x: hidden;
}

/* Dark Mode */
body.dark-mode {
  background-color: var(--bg-color-dark);
  color: var(--text-color-dark);
}

/* Layout Container */
.container {
  padding: 2rem;
  max-width: var(--container-max-width);
  width: 100%;
  background: var(--card-bg);
  border-radius: var(--card-border-radius);
  box-shadow: var(--card-box-shadow);
  transition: background-color var(--transition-duration)
      var(--transition-easing),
    box-shadow var(--transition-duration) var(--transition-easing);
  text-align: center;
  overflow: hidden;
}

body.dark-mode .container {
  background: var(--card-bg-dark);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* Heading */
h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
  letter-spacing: 1px;
}

/* Particle Canvas */
canvas {
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
}

/* Button Container */
.button-container {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

/* Buttons */
.button {
  position: relative;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  background: var(--primary-color);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
  transition: transform var(--transition-duration) var(--transition-easing),
    box-shadow var(--transition-duration) var(--transition-easing),
    background var(--transition-duration) var(--transition-easing);
}

/* Button Indicators */
.button.champions-league::before,
.button.europa-league::before,
.button.conference-league::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 5px;
  border-radius: 8px 0 0 8px;
}

.button.champions-league::before {
  background: var(--champions-league-color);
}

.button.europa-league::before {
  background: var(--europa-league-color);
}

.button.conference-league::before {
  background: var(--conference-league-color);
}

/* Button Hover Effects */
.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  background: var(--button-hover-light);
}

body.dark-mode .button:hover {
  background: var(--button-hover-dark);
}

/* Toggle Mode Button */
.toggle-mode {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: none;
  background: var(--primary-color);
  color: #fff;
  border-radius: 50%;
  padding: 0.5rem;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background-color var(--transition-duration)
      var(--transition-easing),
    color var(--transition-duration) var(--transition-easing);
}

.toggle-mode:hover {
  background: var(--button-hover-light);
}

body.dark-mode .toggle-mode:hover {
  background: var(--button-hover-dark);
}

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  .button-container {
    flex-direction: column;
  }

  .button {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
  }

  .toggle-mode {
    top: 0.75rem;
    right: 0.75rem;
    padding: 0.5rem;
    font-size: 1rem;
  }
}

@media (max-width: 375px) {
  h1 {
    font-size: 1.75rem;
  }

  .button {
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
  }

  .toggle-mode {
    font-size: 0.85rem;
    padding: 0.4rem;
  }
}