:root {
  --bg-color: #f7f9f4;
  --text-dark: #203a20;
  --leaf-green: #2b5c2b;
  --sun-gold: #d4a337;
  --glass-blue: rgba(0, 168, 204, 0.15);
  
  --font-solar: 'Outfit', sans-serif;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-dark);
  font-family: var(--font-solar);
  font-weight: 300;
  line-height: 1.6;
}

.solar-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 60px 20px;
}

.solar-header {
  text-align: center;
  margin-bottom: 50px;
  position: relative;
}

.nav-back {
  display: inline-block;
  color: var(--leaf-green);
  text-decoration: none;
  font-weight: 500;
  border: 1px dashed var(--leaf-green);
  padding: 5px 15px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.nav-back:hover {
  background: var(--leaf-green);
  color: #fff;
}

.sun-icon {
  font-size: 3rem;
  margin-bottom: 10px;
  animation: spin 20s linear infinite;
  display: inline-block;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.solar-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  color: var(--leaf-green);
  margin: 0;
}

.solar-subtitle {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 10px auto 0 auto;
  opacity: 0.8;
}

.solar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.solar-card {
  background: #ffffff;
  border: 1px solid rgba(43, 92, 43, 0.1);
  padding: 35px;
  box-shadow: 0 10px 25px rgba(43, 92, 43, 0.04);
  /* Organic curves */
  border-radius: 40px 10px 40px 10px;
  transition: transform 0.3s;
}

.solar-card:hover {
  transform: translateY(-4px);
}

.solar-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--leaf-green);
  margin-top: 0;
  border-bottom: 2px solid rgba(212, 163, 55, 0.3);
  padding-bottom: 8px;
}

.solar-card p {
  opacity: 0.9;
  font-size: 0.95rem;
}

/* Solar Interactive panel */
.slider-wrapper {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.solar-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: #ddd;
  border-radius: 3px;
  outline: none;
}

.solar-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--sun-gold);
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.solar-panel-visual {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 25px 0;
}

.solar-collector {
  width: 60px;
  height: 40px;
  background: linear-gradient(135deg, #007f99 0%, #005a70 100%);
  border: 2px solid var(--sun-gold);
  box-shadow: 0 5px 15px rgba(0, 90, 112, 0.2);
  border-radius: 4px;
  transition: transform 0.1s ease-out;
  transform-origin: center center;
}

.cell-grid {
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(to right, rgba(255,255,255,0.2) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.2) 1px, transparent 1px);
  background-size: 15px 10px;
}

.power-display {
  text-align: center;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--leaf-green);
  background: #f0f7e8;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid rgba(43, 92, 43, 0.15);
}

/* Eco list */
.eco-list {
  list-style: none;
  padding-left: 0;
}

.eco-list li {
  margin-bottom: 12px;
  position: relative;
  padding-left: 25px;
}

.eco-list li::before {
  content: "🌱";
  position: absolute;
  left: 0;
  top: 1px;
}