/* Reset & Base Styles */
:root {
  /* Light Theme Colors (OKLCH) */
  --bg-color: oklch(98% 0.01 240);
  --surface-color: oklch(100% 0 0 / 0.7);
  --text-primary: oklch(20% 0.02 240);
  --text-secondary: oklch(45% 0.02 240);
  --accent-color: oklch(65% 0.2 240); /* Beautiful Blue */
  --accent-glow: oklch(65% 0.2 240 / 0.3);
  --card-shadow: 0 8px 32px 0 oklch(0% 0 0 / 0.1);
  --border-color: oklch(90% 0.02 240);
  
  /* Lotto Ball Colors */
  --ball-1: oklch(75% 0.15 80);  /* Yellowish */
  --ball-2: oklch(65% 0.18 200); /* Bluish */
  --ball-3: oklch(60% 0.15 20);  /* Reddish */
  --ball-4: oklch(55% 0.15 250); /* Purplish */
  --ball-5: oklch(60% 0.15 150); /* Greenish */

  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  --bg-color: oklch(15% 0.02 240);
  --surface-color: oklch(25% 0.02 240 / 0.6);
  --text-primary: oklch(95% 0.01 240);
  --text-secondary: oklch(75% 0.01 240);
  --accent-color: oklch(75% 0.15 200);
  --accent-glow: oklch(75% 0.15 200 / 0.4);
  --card-shadow: 0 8px 32px 0 oklch(0% 0 0 / 0.4);
  --border-color: oklch(35% 0.02 240);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  background-image: 
    radial-gradient(at 0% 0%, var(--accent-glow) 0px, transparent 50%),
    radial-gradient(at 100% 100%, var(--accent-glow) 0px, transparent 50%);
  background-attachment: fixed;
}

/* Header & Theme Toggle */
header {
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.05em;
  color: var(--accent-color);
}

#theme-toggle {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 0.6rem;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.2s, background-color var(--transition-speed);
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
}

#theme-toggle:hover {
  transform: scale(1.1);
}

#theme-toggle .icon-moon,
[data-theme="dark"] #theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] #theme-toggle .icon-moon {
  display: inline;
}

/* Main Layout */
main {
  flex: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

.hero {
  text-align: center;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero h1 span {
  color: var(--accent-color);
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Generator Container */
.generator-container {
  display: flex;
  justify-content: center;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Lotto Generator Web Component Styles (Applied via Shadow DOM or Globally for simplicity here) */
lotto-generator {
  width: 100%;
}

/* Animations */
@keyframes pop-in {
  0% { transform: scale(0.5); opacity: 0; }
  70% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}