/* Define default (light mode) theme */
:root {
  --background-color: #e0e0e0;
  --text-color: #333;
  --button-background: #e0e0e0;
  --button-shadow-light: #ffffff;
  --button-shadow-dark: #bebebe;
  --clear-bg-color: #f87070;
  --submit-bg-color: #70f8a9;
  --clear-text-color: white;
  --submit-text-color: white;
}

/* Dark mode theme variables */
.dark-mode {
  --background-color: #333;
  --text-color: #e0e0e0;
  --button-background: #444;
  --button-shadow-light: #555;
  --button-shadow-dark: #222;
  --clear-bg-color: #d9534f;
  --submit-bg-color: #5cb85c;
  --clear-text-color: white;
  --submit-text-color: white;
}

/* Basic styles for body */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: Arial, sans-serif;
  transition: background-color 0.3s, color 0.3s;
}

/* Neomorphism container */
.calc-body {
  width: 400px;
  padding: 20px;
  background-color: var(--background-color);
  border-radius: 20px;
  box-shadow: 8px 8px 20px var(--button-shadow-dark), -8px -8px 20px var(--button-shadow-light);
  transition: background-color 0.3s, box-shadow 0.3s;
}

/* Logo and Time Section */
.logo-and-time {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

#logo {
  font-size: 1.5rem;
  font-weight: bold;
}

#dateTime {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  padding: 5px;
  background-color: var(--background-color);
  border-radius: 15px;
  margin-bottom: 20px;
  box-shadow: inset 5px 5px 10px var(--button-shadow-dark), inset -5px -5px 10px var(--button-shadow-light);
  transition: background-color 0.3s, box-shadow 0.3s;
}

#clk, #date {
  font-size: 0.9rem;
  color: var(--text-color);
}

/* Model and Change Theme Section */
.model-and-change-theme {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

#model {
  font-size: 1.2rem;
}

#change {
  font-size: 1.5rem;
  cursor: pointer;
}

/* Greet Section */
#greet {
  font-size: 1rem;
  color: var(--text-color);
  margin-bottom: 5px;
}

/* Input Container */
.input-container {
  height: 50px;
  padding: 10px;
  background-color: var(--background-color);
  border-radius: 15px;
  margin-bottom: 20px;
  box-shadow: inset 5px 5px 10px var(--button-shadow-dark), inset -5px -5px 10px var(--button-shadow-light);
  transition: background-color 0.3s, box-shadow 0.3s;
}

#userInput, #result {
  font-size: 1.5rem;
  color: var(--text-color);
  overflow: hidden; /* Ensure content does not overflow */
}

/* Scientific Buttons */
#scientific {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.sci {
  padding: 10px;
  font-size: 1rem;
  color: var(--text-color);
  background-color: var(--button-background);
  border: none;
  border-radius: 10px;
  box-shadow: 5px 5px 10px var(--button-shadow-dark), -5px -5px 10px var(--button-shadow-light);
  cursor: pointer;
  transition: background-color 0.3s, box-shadow 0.3s;
}

.sci:active {
  box-shadow: inset 5px 5px 10px var(--button-shadow-dark), inset -5px -5px 10px var(--button-shadow-light);
}

/* Keys Section */
.keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.keys button {
  padding: 15px;
  font-size: 1.2rem;
  color: var(--text-color);
  background-color: var(--button-background);
  border: none;
  border-radius: 15px;
  box-shadow: 5px 5px 10px var(--button-shadow-dark), -5px -5px 10px var(--button-shadow-light);
  cursor: pointer;
  transition: background-color 0.3s, box-shadow 0.3s;
}

.keys button:active {
  box-shadow: inset 5px 5px 10px var(--button-shadow-dark), inset -5px -5px 10px var(--button-shadow-light);
}

/* Clear and Submit Buttons */
.clear, .submit {
  grid-column: span 2;
  font-size: 1.2rem;
  padding: 15px;
}

.clear {
  background-color: var(--clear-bg-color);
  color: var(--clear-text-color);
}

.submit {
  background-color: var(--submit-bg-color);
  color: var(--submit-text-color);
}

/* Responsive Design */
@media (max-width: 768px) {
  .calc-body {
    width: 90%;
    padding: 15px;
  }

  #scientific {
    grid-template-columns: repeat(5, 1fr); /* Reduce number of columns on smaller screens */
    gap: 8px;
  }

  .keys {
    grid-template-columns: repeat(4, 1fr); /* Same layout for smaller screens */
    gap: 8px;
  }

  .sci, .keys button {
    padding: 12px; /* Reduce padding on smaller screens */
    font-size: 1rem;
  }

  .clear, .submit {
    font-size: 1rem;
    padding: 12px;
  }
}

@media (max-width: 480px) {
  body {
    max-height: 95vh;
  }
  .calc-body {
    width: 100%;
    padding: 10px;
  }
  .logo-and-time {
    margin-bottom: -5px;
  }
  .model-and-change-theme {
    margin-bottom: 2px;
  }

  #scientific {
    grid-template-columns: repeat(5, 1fr); /* Further reduce columns on smaller screens */
  }
  .sci {
    padding: 7px;
    font-size: 0.7rem;
  }

  .keys button {
    padding: 12px;
    font-size: 1.0rem;
  }

  .clear, .submit {
    font-size: 0.9rem;
    padding: 10px;
  }

  #logo {
    font-size: 1.2rem;
  }

  #model {
    font-size: 1rem;
  }
}