body {
  margin: 0;
  padding: 0;
  font-family: 'Arial', sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body.light {
  background: #f0f0f0;
  color: #333;
}

body.dark {
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  color: #f1f1f1;
}

.container {
  max-width: 1200px;
  margin: 20px auto;
  padding: 10px;
}

h1 {
  text-align: center;
  font-size: 2.5rem;
}

.top-controls,
.filter-controls,
.settings-controls,
.login-controls,
.chart-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 10px 0;
}

input,
select,
button {
  padding: 10px;
  font-size: 14px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
}

.coin-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 15px;
}

.coin {
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 15px;
  box-shadow: 0 0 10px rgba(0, 255, 231, 0.2);
  transition: transform 0.3s;
  position: relative;
}

body.light .coin {
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.coin:hover {
  transform: translateY(-5px);
}

.coin img {
  width: 50px;
  height: 50px;
}

.coin h2 {
  font-size: 1.2rem;
}

.star {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 20px;
  cursor: pointer;
}

.star.favorited {
  color: gold;
}

.positive {
  color: #00cc00;
}

.negative {
  color: #ff3333;
}

#chart {
  margin-top: 20px;
  background: #fff;
  border-radius: 8px;
}

@media (max-width: 600px) {
  .top-controls,
  .filter-controls,
  .settings-controls,
  .login-controls,
  .chart-controls {
    flex-direction: column;
    align-items: center;
  }

  .coin-list {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2rem;
  }
}