@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;800&display=swap');

:root {
  --bg-gradient: linear-gradient(45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --text-color: #ffffff;
  --shadow-color: rgba(31, 38, 135, 0.37);
  --ball-bg: rgba(255, 255, 255, 0.2);
  --ball-border: rgba(255, 255, 255, 0.3);
}

[data-theme="light"] {
  --bg-gradient: linear-gradient(45deg, #f3f4f7, #e2e8f0, #cbd5e0);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(200, 200, 200, 0.3);
  --text-color: #2d3748;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --ball-bg: rgba(255, 255, 255, 0.8);
  --ball-border: rgba(0, 0, 0, 0.1);
}

body {
  font-family: 'Poppins', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background: var(--bg-gradient);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  color: var(--text-color);
  overflow: hidden;
  transition: background 0.5s ease, color 0.5s ease;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
}

#theme-btn {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 10px var(--shadow-color);
  transition: all 0.3s ease;
}

#theme-btn:hover {
  transform: rotate(30deg) scale(1.1);
}

.container {
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  padding: 50px;
  border-radius: 30px;
  text-align: center;
  box-shadow: 0 8px 32px 0 var(--shadow-color);
  max-width: 500px;
  width: 90%;
  transition: background 0.5s ease, border 0.5s ease, box-shadow 0.5s ease;
}

h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 40px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-color);
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.numbers-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-bottom: 40px;
}

.number {
  width: 65px;
  height: 65px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-color);
  background: var(--ball-bg);
  border: 1px solid var(--ball-border);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.number:hover {
  transform: translateY(-10px) scale(1.1);
  background: var(--ball-bg);
  filter: brightness(1.2);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* Glassy colors for the balls - adjusted with opacity to look good on both themes */
.number:nth-child(6n+1) { background: rgba(255, 82, 82, 0.6); color: #fff; }
.number:nth-child(6n+2) { background: rgba(82, 155, 255, 0.6); color: #fff; }
.number:nth-child(6n+3) { background: rgba(105, 255, 82, 0.6); color: #fff; }
.number:nth-child(6n+4) { background: rgba(255, 234, 82, 0.6); color: #2d3748; }
.number:nth-child(6n+5) { background: rgba(184, 82, 255, 0.6); color: #fff; }
.number:nth-child(6n)   { background: rgba(255, 140, 82, 0.6); color: #fff; }


#generate-btn {
  padding: 18px 45px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-color);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 15px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 2px;
  outline: none;
  box-shadow: 0 4px 10px var(--shadow-color);
}

#generate-btn:hover {
  background: var(--glass-bg);
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px var(--shadow-color);
}

#generate-btn:active {
  transform: translateY(1px);
}