:root {
  /* Light Theme (Default - Crystal Clear) */
  --bg-color: #f8fafc;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --primary-glow: #38bdf8;
  --secondary-glow: #818cf8;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --card-shadow: rgba(0, 0, 0, 0.05);
  --btn-gradient: linear-gradient(135deg, #0ea5e9, #6366f1);
  --title-gradient: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
  --transition-speed: 0.5s;
}

[data-theme="dark"] {
  /* Dark Theme (Neon-Future) */
  --bg-color: #0b0e14;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --primary-glow: #00d2ff;
  --secondary-glow: #9d50bb;
  --text-main: #ffffff;
  --text-muted: #a0aec0;
  --card-shadow: rgba(0, 0, 0, 0.4);
  --btn-gradient: linear-gradient(135deg, #00d2ff, #9d50bb);
  --title-gradient: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: 'Inter', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* Background effects with theme transition */
body::before, body::after {
  content: '';
  position: absolute;
  width: 50%;
  height: 50%;
  opacity: 0.2;
  filter: blur(100px);
  z-index: -1;
  transition: background var(--transition-speed) ease;
}

body::before {
  top: -10%;
  left: -10%;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
}

body::after {
  bottom: -10%;
  right: -10%;
  background: radial-gradient(circle, var(--secondary-glow) 0%, transparent 70%);
}

.container {
  width: 100%;
  max-width: 800px;
  padding: 2rem;
  text-align: center;
  z-index: 1;
}

/* Floating Toggle Position */
.toggle-container {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 100;
}