* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  min-height: 100vh;

  display: flex;
  justify-content: center;
  align-items: center;

  transition: 0.3s ease;
}

.container {
  width: 90%;
  max-width: 600px;
  padding: 35px;
  border-radius: 20px;
  text-align: center;
  transition: 0.3s ease;
}

h1 {
  margin-bottom: 10px;
}

p {
  font-size: 16px;
}

.theme-buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 25px 0;
}

.theme-buttons button {
  border: none;
  padding: 10px 18px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 15px;
  transition: 0.3s ease;
}

.theme-buttons button:hover {
  transform: translateY(-2px);
}

.theme-buttons button.active {
  outline: 3px solid currentColor;
}

.card {
  padding: 25px;
  border-radius: 16px;
  margin-top: 20px;
  transition: 0.3s ease;
}

/* Light Theme */
.light-theme {
  background-color: #f5f5f5;
  color: #222;
}

.light-theme .container {
  background-color: white;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.light-theme .card {
  background-color: #eeeeee;
}

.light-theme button {
  background-color: #222;
  color: white;
}

/* Dark Theme */
.dark-theme {
  background-color: #121212;
  color: white;
}

.dark-theme .container {
  background-color: #1f1f1f;
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.08);
}

.dark-theme .card {
  background-color: #2c2c2c;
}

.dark-theme button {
  background-color: white;
  color: #121212;
}

/* Coffee Theme */
.coffee-theme {
  background-color: #3b2418;
  color: #fff4e6;
}

.coffee-theme .container {
  background-color: #5a3825;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.coffee-theme .card {
  background-color: #7b4f35;
}

.coffee-theme button {
  background-color: #f3d2a4;
  color: #3b2418;
}

/* Ocean Theme */
.ocean-theme {
  background-color: #0f4c5c;
  color: #e0fbfc;
}

.ocean-theme .container {
  background-color: #1b6f82;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.ocean-theme .card {
  background-color: #2a9d8f;
}

.ocean-theme button {
  background-color: #e0fbfc;
  color: #0f4c5c;
}

/* Mobile */
@media (max-width: 500px) {
  .container {
    padding: 25px 20px;
  }

  .theme-buttons {
    flex-direction: column;
  }

  .theme-buttons button {
    width: 100%;
  }
}