:root {
  --bg-gradient: linear-gradient(160deg, #e0f7fa, #a7ffeb, #69f0ae);
  --text-color: #00695c;
  --accent: #00bfa5;
  --muted: #004d40;
  --link-color: #00796b;
  --header-bg: rgba(255, 255, 255, 0.85);
}

body {
  margin: 0;
  font-family: "Poppins", sans-serif;
  background: var(--bg-gradient);
  color: var(--text-color);
  transition: background 1s ease, color 0.8s ease;
}

input[name="season"] { display: none; }

.season-switch {
  position: fixed;
  top: 80px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 3000;
}
.season-switch label {
  cursor: pointer;
  font-size: 2rem;
  transition: transform 0.3s, text-shadow 0.3s, color 0.3s;
}
.season-switch label:hover {
  transform: scale(1.3);
  text-shadow: 0 0 8px rgba(0,0,0,0.2);
}

#spring:checked ~ .season-switch label[for="spring"],
#summer:checked ~ .season-switch label[for="summer"],
#autumn:checked ~ .season-switch label[for="autumn"],
#winter:checked ~ .season-switch label[for="winter"] {
  transform: scale(1.4);
  text-shadow: 0 0 10px gold;
  color: #ff6f00;
}

.content {
  transition: 0.5s ease;
  min-height: 100vh;
}


#spring:checked ~ .content {
  --bg-gradient: linear-gradient(160deg, #a5d6a7, #66bb6a, #2e7d32);
  --text-color: #1b5e20;
  --accent: #1b5e20;
  --muted: #145a32;
  --link-color: #0d3d1b;
  --header-bg: rgba(245, 255, 245, 0.9);
}

#summer:checked ~ .content {
  --bg-gradient: linear-gradient(160deg, #fff9c4, #fff176, #ffd600);
  --text-color: #f57f17;
  --accent: #ffca28;
  --muted: #ff8f00;
  --link-color: #ff6f00;
  --header-bg: rgba(255, 249, 196, 0.85);
}

#autumn:checked ~ .content {
  --bg-gradient: linear-gradient(160deg, #ffe0b2, #ffab91, #ff7043);
  --text-color: #bf360c;
  --accent: #ff6d00;
  --muted: #d84315;
  --link-color: #e65100;
  --header-bg: rgba(255, 224, 178, 0.85);
}

#winter:checked ~ .content {
  --bg-gradient: linear-gradient(160deg, #e0f2f7, #b3e5fc, #81d4fa);
  --text-color: #01579b;
  --accent: #0288d1;
  --muted: #0277bd;
  --link-color: #0277bd;
  --header-bg: rgba(224, 242, 247, 0.85);
}

header {
  text-align: center;
  background: var(--header-bg);
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
  padding: 25px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}
header h1 {
  margin: 0;
  color: var(--accent);
  font-size: 2.5rem;
  font-weight: 800;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.nav-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 15px;
  margin-top: 12px;
}
.nav-links a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 8px 16px;
  border-radius: 10px;
  transition: background 0.3s, color 0.3s, transform 0.2s;
}
.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.4);
  color: #fff;
  transform: scale(1.1);
}

main {
  padding: 40px 20px 70px;
  text-align: center;
  background: var(--bg-gradient);
  color: var(--text-color);
  transition: background 1s ease, color 0.8s ease;
}

h2 { color: var(--accent); margin-top: 15px; font-size: 2.2rem; }
h3 { color: var(--accent); font-size: 1.5rem; margin-top: 25px; }

p {
  max-width: 850px;
  margin: 15px auto;
  line-height: 1.8;
  font-size: 1.1rem;
}

.hero-img {
  width: 90%;
  max-width: 650px;
  height: auto;
  border-radius: 16px;
  margin: 25px auto;
  display: block;
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.hero-img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(0,0,0,0.5);
}
footer {
  text-align: center;
  color: var(--muted);
  padding: 25px;
  font-size: 1rem;
  background: rgba(255,255,255,0.15);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
} 
@media (max-width: 700px) {
  .nav-links { flex-direction: column; gap: 10px; }
  .season-switch { top: 70px; right: 15px; }
  h2 { font-size: 1.8rem; }
  h3 { font-size: 1.3rem; }
}