:root {
    /* Color Palette - Premium Dark */
    --bg-color: oklch(15% 0.02 260);
    --surface-color: oklch(25% 0.03 260);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    --text-primary: oklch(95% 0.01 260);
    --text-secondary: oklch(75% 0.02 260);
    
    --primary-gold: oklch(85% 0.18 90);
    --primary-gold-glow: oklch(85% 0.18 90 / 0.4);
    
    /* Lotto Ball Colors (Korean Standard) */
    --ball-1: #fbc02d; /* Yellow */
    --ball-11: #1976d2; /* Blue */
    --ball-21: #d32f2f; /* Red */
    --ball-31: #616161; /* Gray */
    --ball-41: #388e3c; /* Green */
    
    /* Spacing & Transitions */
    --radius-lg: 24px;
    --radius-md: 12px;
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Layout */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
    flex: 1;
}

header {
    padding: 40px 0;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to bottom, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.05em;
    margin-bottom: 8px;
}

header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    background: var(--glass-bg);
    padding: 6px;
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.nav-tab {
    padding: 10px 24px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-base);
    color: var(--text-secondary);
    font-weight: 600;
}

.nav-tab.active {
    background: var(--surface-color);
    color: var(--primary-gold);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Main Content Area */
.tab-content {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Home / Drawing Machine Section */
#home-section {
    text-align: center;
}

.machine-container {
    height: 320px;
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: 50% 50% 20% 20% / 40% 40% 10% 10%;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), inset 0 0 40px rgba(255,255,255,0.05);
}

.machine-balls {
    position: relative;
    width: 80%;
    height: 80%;
}

.machine-ball-dummy {
    position: absolute;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    opacity: 0.6;
    filter: blur(1px);
}

/* Draw Controls */
.draw-controls {
    margin-bottom: 40px;
}

#draw-btn {
    background: linear-gradient(135deg, var(--primary-gold), oklch(75% 0.15 80));
    color: oklch(10% 0.02 260);
    border: none;
    padding: 18px 48px;
    font-size: 1.2rem;
    font-weight: 800;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: 0 8px 24px var(--primary-gold-glow);
}

#draw-btn:hover:not(:disabled) {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 12px 32px var(--primary-gold-glow);
}

#draw-btn:active:not(:disabled) {
    transform: scale(0.98);
}

#draw-btn:disabled {
    filter: grayscale(1);
    opacity: 0.5;
    cursor: not-allowed;
}

/* Result Area */
#result-area {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    min-height: 80px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.stat-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 20px;
    border-radius: var(--radius-md);
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-gold);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Web Component Styles */
lotto-ball {
    display: inline-block;
    perspective: 500px;
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 600px) {
    header h1 { font-size: 2rem; }
    .machine-container { height: 240px; }
    #draw-btn { padding: 15px 36px; width: 100%; }
}