/* Define CSS Variables for Colors */
:root {
  /* Light mode colors */
  --bg-color-light: #fff;
  --text-color-light: #111;
  --header-bg-light: #eee;
  --input-bg-light: #fff;
  --input-text-light: #111;
  --input-border-light: #ccc;
  --nav-button-bg-light: #ffffff;
  --nav-button-hover-bg-light: #630707; /* Red hover for buttons */
  --nav-button-text-light: #111;
  --card-bg-light: #ffffff;
  --card-shadow-light: rgba(0,0,0,0.1);
  --card-title-bg-light: #0b7726; /* Green title background */
  --card-title-text-light: white;

  /* Dark mode toggle specific */
  --toggle-slider-bg-light: #ccc;
  --toggle-slider-dot-light: white;
  --toggle-slider-bg-checked: #666;

  /* Modal colors (can be themed or remain constant) */
  --modal-overlay-bg: rgba(0,0,0,0.9);
  --modal-content-bg: #000;
  --modal-close-color: #fff;
  --model-viewer-bg: #111; /* Background for model-viewer itself */
}

/* Dark mode overrides */
body.dark {
  --bg-color-light: #111;
  --text-color-light: #eee;
  --header-bg-light: #222;
  --input-bg-light: #333;
  --input-text-light: white;
  --input-border-light: #555;
  --nav-button-bg-light: #444;
  --nav-button-hover-bg-light: #666; /* Darker hover for buttons */
  --nav-button-text-light: #eee;
  --card-bg-light: #222;
  --card-shadow-light: rgba(0,0,0,0.3); /* Stronger shadow for dark mode */
  --card-title-text-light: white; /* Ensure text remains white */

  /* Dark mode toggle specific */
  --toggle-slider-bg-light: #666;
}


body {
  font-family: sans-serif;
  margin: 0;
  background: var(--bg-color-light);
  color: var(--text-color-light);
  transition: background 0.3s, color 0.3s;
}

header {
  padding: 1rem;
  background: var(--header-bg-light);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

h1 {
  flex: 1 1 100%; /* Takes full width on smaller screens, allowing other elements to wrap */
  margin: 0;
  text-align: center; /* Center the title */
}

@media (min-width: 768px) {
    header {
        justify-content: space-around; /* Distribute items horizontally */
    }
    h1 {
        flex: none; /* Don't force full width on larger screens */
        text-align: left;
    }
}


input[type="text"] {
  padding: 0.5rem;
  width: 200px;
  border-radius: 5px;
  border: 1px solid var(--input-border-light);
  background: var(--input-bg-light);
  color: var(--input-text-light);
}

nav {
  text-align: center;
  margin: 1rem;
}

nav button {
  padding: 0.5rem 1rem;
  margin: 0.2rem;
  border: none;
  background: var(--nav-button-bg-light);
  color: var(--nav-button-text-light);
  cursor: pointer;
  border-radius: 5px;
  transition: background 0.2s, color 0.2s; /* Smooth transition for hover */
}

nav button:hover,
nav button.active { /* Added .active class for active filter button */
  background: var(--nav-button-hover-bg-light);
  color: white; /* Ensure text is visible on hover/active */
}

main.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  padding: 1rem;
}

.card {
  background: var(--card-bg-light);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px var(--card-shadow-light);
  text-align: center;
  cursor: pointer; /* Indicate it's clickable */
  transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out; /* Smooth hover effect */
}

.card:hover {
    transform: translateY(-5px); /* Lift card on hover */
    box-shadow: 0 4px 12px var(--card-shadow-light); /* Stronger shadow on hover */
}

.card h3 {
  margin: 0;
  padding: 0.5rem;
  background: var(--card-title-bg-light);
  color: var(--card-title-text-light); /* Explicitly set text color */
}

/* Dark Mode Toggle */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 20px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  background-color: var(--toggle-slider-bg-light);
  border-radius: 34px;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  transition: 0.4s;
}

.slider::before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  background-color: var(--toggle-slider-dot-light);
  border-radius: 50%;
  left: 2px;
  bottom: 2px;
  transition: 0.4s;
}

input:checked + .slider {
  background-color: var(--toggle-slider-bg-checked);
}

input:checked + .slider::before {
  transform: translateX(20px);
}

/* Modal Styling */
.modal {
  display: none; /* Hidden by default */
  position: fixed;
  z-index: 999;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  background-color: var(--modal-overlay-bg);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.modal.is-active { /* Class to show the modal */
    display: flex; /* Use flex to center content */
    opacity: 1;
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 960px;
  background-color: var(--modal-content-bg);
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.5);
  transform: translateY(-20px); /* Initial position for animation */
  transition: transform 0.3s ease-in-out;
}

.modal.is-active .modal-content {
    transform: translateY(0); /* Final position for animation */
}

.close {
  position: absolute;
  top: 8px;
  right: 16px;
  font-size: 2rem;
  color: var(--modal-close-color);
  cursor: pointer;
  transition: color 0.2s;
}

.close:hover {
    color: #ff0000; /* Red on hover for close button */
}

/* Ensure model-viewer within modal also uses consistent background */
.modal model-viewer {
  width: 100%;
  height: 80vh;
  background: var(--model-viewer-bg);
}