:root {
  --primary: #0f172a;
  --accent: #38bdf8;
  --background: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
}

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Global */
body {
  font-family: 'Inter', sans-serif;
  background-color: var(--background);
  color: var(--text);
  margin: 20px;
}

/* Header */
header {
  background-color: var(--primary);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
  font-size: 1.75rem;
}

nav a {
  color: #cbd5e1;
  margin-left: 1.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s;
}

nav a:hover {
  color: var(--accent);
}

/* Hero Section */
.hero {
  background: linear-gradient(to right, #0f172a, #334155);
  color: white;
  padding: 6rem 2rem;
  text-align: center;
}

.hero h2 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  max-width: 700px;
  margin: auto;
  opacity: 0.9;
}

/* Sections */
section {
  padding: 4rem 2rem;
  max-width: 1100px;
  margin: auto;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
  color: var(--primary);
  border-bottom: 3px solid var(--accent);
  padding-bottom: 0.5rem;
}

/* Cards */
.card {
  display: block;
  background-color: var(--surface);
  border-radius: 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  padding: 2rem;
  margin-bottom: 2rem;
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
  color: inherit;
  border: 1px solid rgba(0, 0, 0, 0.05); /* Divider-like effect */
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
  cursor: pointer;
}

.card h4 {
  margin-bottom: 0.5rem;
  color: var(--accent);
  font-size: 1.25rem;
}

.card p {
  margin: 0;
}

.card nav span {
  color: var(--accent);
  font-weight: 600;
  display: inline-block;
  margin-top: 0.5rem;
}


/* Footer */
footer {
  text-align: center;
  background-color: var(--primary);
  color: #94a3b8;
  padding: 1.5rem 0;
  font-size: 0.9rem;
}

/* Charts & Grids */
.chart-grid,
.graph-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 10px;
  margin-bottom: 10px;
}

.graph-grid {
  gap: 24px;
}

canvas {
  width: 100%;
  height: 400px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 10px;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 8px 12px;
  border: 1px solid #e5e7eb;
  text-align: center;
}

th {
  background-color: #f3f4f6;
}

/* Chart Wrapper */
.chart-wrapper {
  position: relative;
  cursor: pointer;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 10px;
  height: 300px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-wrapper canvas {
  width: 100%;
  height: 300px;
}

.chart-wrapper.expanded {
  position: fixed;
  inset: 0; /* fills the screen */
  margin: auto;
  z-index: 1000;
  width: 90vw;
  height: 80vh;
  padding: 20px;
  background: white;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-wrapper.expanded canvas {
  height: 100%;
}

.close-btn {
  position: absolute;
  top: 8px;
  right: 12px;
  background: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #444;
  z-index: 10;
  display: none;
}

.chart-wrapper.expanded .close-btn {
  display: block;
}

/* Battery-specific */
#batteryPercent {
  width: 200px;
  height: 200px;
  flex-shrink: 0;
}

/* Team Section */
#team {
  padding: 2rem;
  max-width: 700px;
  margin: auto;
}

.team-member {
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.team-member img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 50%;
  flex-shrink: 0;
}

.team-member h4 {
  margin: 0 0 0.25rem;
  font-size: 1.25rem;
}

.team-member p {
  margin: 0;
  font-size: 0.95rem;
  color: #555;
}


.battery-charts-row {
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
  justify-content: space-between;
}

/* Optional: constrain battery percent position */
.battery-percent-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 200px;
  height: 200px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 10px;
  flex-shrink: 0;
}

#map {
  height: 500px;
  width: 75%;
  margin: auto
}


@media (max-width: 768px) {
  body {
    margin: 10px;
    font-size: 1rem;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  nav {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }

  nav a {
    margin-left: 0;
  }

  .hero {
    padding: 4rem 1rem;
  }

  .hero h2 {
    font-size: 2.25rem;
  }

  .hero p {
    font-size: 1rem;
  }

  section {
    padding: 2rem 1rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .card {
    padding: 1.25rem;
  }

  .card h4 {
    font-size: 1.1rem;
  }

  .chart-grid,
  .graph-grid {
    grid-template-columns: 1fr;
  }

  canvas,
  .chart-wrapper,
  .chart-wrapper canvas {
    height: 250px;
  }

  .chart-wrapper.expanded {
    width: 95vw;
    height: 70vh;
  }

  .battery-charts-row {
    flex-direction: column;
    align-items: stretch;
  }

  .battery-percent-wrapper {
    width: 100%;
    height: auto;
  }

  #map {
    width: 100%;
    height: 300px;
  }

  .team-member {
    flex-direction: column;
    text-align: center;
  }

  .team-member img {
    width: 80px;
    height: 80px;
  }
}


.carousel-section {
  padding: 2rem;
  max-width: 1000px;
  margin: auto;
}

.carousel {
  position: relative;
  overflow: hidden;
}

.carousel-track-container {
  overflow: hidden;
  width: 100%;
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.carousel-slide {
  flex: 0 0 25%; /* Show 4 images at once */
  padding: 0.5rem;
  box-sizing: border-box;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.carousel-slide:hover {
  transform: scale(1.03);
}

.carousel-slide img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

/* Carousel navigation buttons */
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(15, 23, 42, 0.6);
  color: white;
  border: none;
  font-size: 2rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  z-index: 10;
  border-radius: 50%;
}

.carousel-btn:hover {
  background-color: var(--accent, #3b82f6);
}

.carousel-btn.prev {
  left: 10px;
}

.carousel-btn.next {
  right: 10px;
}

/* Responsive breakpoints */
@media (max-width: 1024px) {
  .carousel-slide {
    flex: 0 0 33.333%; /* 3 per view */
  }
}

@media (max-width: 768px) {
  .carousel-slide {
    flex: 0 0 50%; /* 2 per view */
  }
}

@media (max-width: 480px) {
  .carousel-slide {
    flex: 0 0 100%; /* 1 per view */
  }
}

/* ---------- Lightbox (Expanded Image) ---------- */
.lightbox {
  display: none;
  position: fixed;
  z-index: 999;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.85);
  justify-content: center;
  align-items: center;
  cursor: zoom-out;
  animation: fadeIn 0.3s ease;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 10px;
  box-shadow: 0 0 30px rgba(0,0,0,0.5);
  animation: zoomIn 0.3s ease;
}

/* Animations for smooth entry */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes zoomIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}