/* ------------------------------
   FILTER BUTTONS
--------------------------------- */

/* Arranges buttons in a flexible row that can wrap onto multiple lines if needed. */
.filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

/* Style the filter buttons. */
.filter-btn {
  padding: 0.7rem 1.2rem;
  border: none;
  border-radius: 2rem;
  background-color: #e2e8f0;
  color: black;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

/* Change the button appearance on hover. */
.filter-btn:hover {
  background-color: #cbd5e0;
  transform: translateY(-2px);
}

/* Style the currently selected button.
   This class is added and removed with jQuery. */
.filter-btn.active {
  background-color: #805ad5;
  color: white;
}


/* ------------------------------
   CARD GRID
--------------------------------- */

/* Create a responsive grid of cards.
   minmax(240px, 1fr) means:
   - each column should be at least 240px wide
   - but it can grow larger if extra space is available

   This allows the browser to automatically decide how many columns
   can fit in each row without needing media queries. */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  background-color: white;
  padding: 1rem;
  border-radius: 18px;
  border: 2px solid silver;
}


/* Style each project card like a card or panel. */
.card {
  background-color: #ffffff;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* Make the card image fill the top area neatly. */
.card img {
  width: 100%;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* Add padding inside the text area of each card. */
.card-text {
  padding: 1rem 1rem 1.25rem;
}

/* Style the small category label. */
.category-label {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: bold;
  color: #805ad5;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Style the project title. */
.card h2 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

/* Style the final paragraph inside each card. */
.card p:last-child {
  margin-bottom: 0;
  color: #4a5568;
}




/* ------------------------------
   BASIC PAGE STYLES
--------------------------------- */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: #cfcfcf;
  color: #1a202c;
  line-height: 1.6;
  padding: 1rem;
}

/* Make images behave more predictably.
   display: block removes extra space under images.
   max-width: 100% keeps images from overflowing. */
img {
  display: block;
  max-width: 100%;
}

/* Make buttons use the same font as the rest of the page. */
button {
  font: inherit;
}

/* Main page container.
   width: 90% gives some side spacing.
   max-width prevents the page from getting too wide.
   margin: 0 auto centers it. */
.wrapper {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 0;
}

/* Center the top heading area and add spacing below it. */
header {
  text-align: center;
  margin-bottom: 2rem;
}

/* Style the main heading. */
header h1 {
  margin-bottom: 0.5rem;
  font-size: 2.25rem;
}

/* Limit the paragraph width so it is easier to read. */
header p {
  max-width: 700px;
  margin: 0 auto;
  color: #4a5568;
}

/* Reusable section heading style. */
.section-heading {
  margin-bottom: 1rem;
  font-size: 1.25rem;
}



/* ------------------------------
   EXPLANATION SECTION
--------------------------------- */

/* Style the explanation box under the card grid. */
.code-explanation {
  background-color: #ffffff;
  border-radius: 18px;
  padding: 1.5rem;
  margin-top: 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

hr.line {
  border: none;
  border-top: 1px solid silver;
  margin: 2rem 0 0 0;
}

/* Add extra space above smaller headings. */
.code-explanation h3 {
  margin-top: 1.5rem;
}

/* Add spacing under lists and definition lists. */
.code-explanation ul,
.code-explanation ol,
.code-explanation dl {
  margin-bottom: 1.25rem;
}

.code-explanation li {
  margin: 0 0 0.25rem 1.5rem;
}

/* Style definition list terms. */
.code-explanation dt {
  font-weight: bold;
  margin-top: 0.75rem;
}

/* Style the definition descriptions. */
.code-explanation dd {
  margin-left: 0;
  margin-bottom: 0.75rem;
  color: #4a5568;
}

/* Style inline code so it stands out visually. */
.code-explanation code {
  font-family: Consolas, Monaco, monospace;
  background-color: #edf2f7;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}