:root {
    /* Base Colors - Light Theme Default */
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --background-color: #f0f3f5;
    --container-bg: #ffffff;
    --text-color: #2c3e50;
    --text-muted: #7f8c8d;
    --white: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-effect: 0 0 10px var(--primary-color);
    --card-shadow: 0 10px 30px -10px var(--shadow-color);
    --ball-size: 50px;
}

[data-theme="dark"] {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --background-color: #0f172a;
    --container-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --white: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --glow-effect: 0 0 15px var(--primary-color);
    --card-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.7);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
}

.app-container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header & Theme Toggle */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -0.05em;
    color: var(--primary-color);
    text-shadow: var(--glow-effect);
}

#theme-toggle {
    background: var(--container-bg);
    border: 2px solid var(--primary-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    box-shadow: var(--glow-effect);
}

/* Latest Draw Section */
.latest-draw {
    background: var(--container-bg);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.latest-draw::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(52, 152, 219, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.latest-draw h2 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    text-align: center;
}

.latest-numbers-container {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    text-align: center;
}

.stat-item {
    background: rgba(0, 0, 0, 0.05);
    padding: 1rem;
    border-radius: 12px;
}

[data-theme="dark"] .stat-item {
    background: rgba(255, 255, 255, 0.05);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.stat-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Main Generator Section */
.generator-section {
    background: var(--container-bg);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.generator-section h1 {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#generate-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 10px 20px -5px var(--primary-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 2.5rem;
}

#generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -5px var(--primary-color);
}

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

/* Lotto Ball Styling */
.lotto-ball {
    width: var(--ball-size);
    height: var(--ball-size);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--white);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3), inset 0 -4px 6px rgba(0, 0, 0, 0.2);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
}

.lotto-ball::after {
    content: '';
    position: absolute;
    top: 5px;
    left: 10px;
    width: 30%;
    height: 30%;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
}

/* Ball Colors based on number ranges (Korean style) */
.ball-1-10 { background: #fbc531; }
.ball-11-20 { background: #487eb0; }
.ball-21-30 { background: #e84118; }
.ball-31-40 { background: #7f8c8d; }
.ball-41-45 { background: #4cd137; }

/* Responsive adjustments */
@media (max-width: 600px) {
    :root {
        --ball-size: 40px;
    }
    
    .generator-section h1 {
        font-size: 1.75rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .latest-numbers-container {
        gap: 0.5rem;
    }
}

/* Partnership Form Styles */
.partnership-section {
    background: var(--container-bg);
    border-radius: 20px;
    padding: 3rem 2rem;
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.partnership-section h2 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--primary-color);
}

.partnership-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 500px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: left;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.form-group input,
.form-group textarea {
    background: rgba(0, 0, 0, 0.05);
    border: 2px solid transparent;
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    background: rgba(255, 255, 255, 0.05);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--glow-effect);
}

#submit-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border: none;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 5px 15px -5px var(--primary-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

#submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px var(--primary-color);
}