:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --controls-bg: #f8f9fa;
    --border-color: #eee;
    --ball-shadow: inset 0 -3px 6px rgba(0,0,0,0.2);
    --btn-bg: #2980b9;
    --btn-hover: #3498db;
    --footer-text: #bbb;
    --nav-bg: #ffffff;
    --accent-color: #3498db;
    --section-bg-alt: #f8f9fa;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --controls-bg: #2d2d2d;
    --border-color: #333;
    --ball-shadow: inset 0 -3px 6px rgba(0,0,0,0.4);
    --btn-bg: #34495e;
    --btn-hover: #4e6a85;
    --footer-text: #666;
    --nav-bg: #1e1e1e;
    --section-bg-alt: #181818;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    padding: 15px 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
}

/* Main Content */
.main-content {
    margin-top: 100px;
}

section {
    padding: 60px 0;
}

/* Generator Section */
#generator.container {
    background: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    text-align: center;
    margin-bottom: 40px;
}

header { margin-bottom: 30px; }
h1 { font-size: 2.2rem; margin-bottom: 10px; }
.subtitle { color: var(--text-secondary); }

.controls {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--controls-bg);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

select {
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--container-bg);
    color: var(--text-primary);
    font-size: 1rem;
}

#result-container { margin-bottom: 30px; min-height: 50px; }

.lotto-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding: 15px 0;
    border-bottom: 1px dashed var(--border-color);
    animation: fadeIn 0.5s ease-out forwards;
}

.ball {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 1rem;
    box-shadow: var(--ball-shadow);
}

.range-1 { background-color: #fbc02d; }
.range-11 { background-color: #1e88e5; }
.range-21 { background-color: #e53935; }
.range-31 { background-color: #757575; }
.range-41 { background-color: #43a047; }

.plus-sign { font-weight: bold; color: var(--text-secondary); }

#generate-btn {
    background-color: var(--btn-bg);
    color: #fff;
    border: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 40px;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s;
    width: 100%;
}

#generate-btn:hover { background-color: var(--btn-hover); transform: translateY(-2px); }

/* Info Sections */
.info-section h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.8rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.info-card {
    background: var(--container-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
}

.info-card h3 { margin-bottom: 15px; color: var(--accent-color); }

.alternate-bg { background-color: var(--section-bg-alt); }

.faq-list { max-width: 700px; margin: 0 auto; }
.faq-item { margin-bottom: 25px; }
.faq-item h4 { margin-bottom: 10px; font-size: 1.1rem; }

.privacy-content { font-size: 0.95rem; color: var(--text-secondary); }

/* Footer */
.site-footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.site-footer p { color: var(--footer-text); font-size: 0.9rem; margin-bottom: 10px; }
.disclaimer { font-size: 0.8rem !important; }

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

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .main-content { margin-top: 80px; }
    h1 { font-size: 1.8rem; }
    #generator.container { padding: 25px; }
    .ball { width: 32px; height: 32px; font-size: 0.85rem; }
}