:root {
    --primary-color: #2c3e50;
    --accent-color: #e94560;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-main: #333333;
    --text-muted: #666666;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.7;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
}

.container {
    max-width: 800px;
    width: 100%;
}

/* Header & Subtitle */
header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Tool Section (Generator) */
.tool-section {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    margin-bottom: 40px;
    border: 1px solid rgba(0,0,0,0.05);
}

.tool-section h2 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.tool-section p {
    margin-bottom: 30px;
    color: var(--text-muted);
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 30px;
    min-height: 60px;
}

.number-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.number-circle.show {
    opacity: 1;
    transform: scale(1);
}

/* Lotto Ball Colors */
.ball-range-1 { background: #fbc531; } /* Yellow */
.ball-range-2 { background: #487eb0; } /* Blue */
.ball-range-3 { background: #e84118; } /* Red */
.ball-range-4 { background: #9c88ff; } /* Purple */
.ball-range-5 { background: #4cd137; } /* Green */

.generate-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 16px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(233, 69, 96, 0.3);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(233, 69, 96, 0.4);
}

.generate-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    box-shadow: none;
}

/* Content Section (SEO/Info) */
.content-section {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 40px;
}

.content-section h2 {
    font-size: 1.5rem;
    margin: 30px 0 15px;
    color: var(--primary-color);
    border-left: 5px solid var(--accent-color);
    padding-left: 15px;
}

.content-section h2:first-of-type {
    margin-top: 0;
}

.content-section p {
    margin-bottom: 15px;
}

.content-section ul {
    margin: 20px 0;
    padding-left: 20px;
}

.content-section li {
    margin-bottom: 10px;
}

/* Ad Section Placeholder */
.ad-section {
    margin-bottom: 40px;
    text-align: center;
}

.ad-wrapper {
    background: #eee;
    padding: 20px;
    border-radius: 10px;
    color: #999;
    font-size: 0.9rem;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 5px;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 600px) {
    .tool-section, .content-section {
        padding: 25px;
    }
    
    h1 { font-size: 2rem; }
    
    .number-circle {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
}