:root {
    /* Light Mode */
    --background-color: #f8f9fa;
    --container-bg: #ffffff;
    --primary-color: #2e7d32;
    --primary-hover-color: #1b5e20;
    --text-color: #333;
    --secondary-text: #555;
    --border-color: #eee;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --number-bg: #e8f5e9;
    --input-bg: #ffffff;
    --nav-bg: #ffffff;
    --link-color: #2e7d32;
    --danger-color: #ff5252;
}

[data-theme="dark"] {
    /* Dark Mode */
    --background-color: #121212;
    --container-bg: #1e1e1e;
    --primary-color: #81c784;
    --primary-hover-color: #a5d6a7;
    --text-color: #e0e0e0;
    --secondary-text: #bbb;
    --border-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --number-bg: #2e3b2e;
    --input-bg: #2d2d2d;
    --nav-bg: #1e1e1e;
    --link-color: #81c784;
    --danger-color: #ff8a80;
}

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(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.7;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0.8rem 0;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
}

.nav-logo {
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 600;
    transition: color 0.2s;
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--primary-color);
}

/* Main Container */
.container {
    background-color: var(--container-bg);
    margin: 3rem auto;
    padding: 3rem;
    border-radius: 1.5rem;
    box-shadow: 0 15px 40px var(--shadow-color);
    width: 90%;
    max-width: 850px;
    flex: 1;
}

h1 {
    color: var(--primary-color);
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    text-align: center;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 1.6rem;
    margin-top: 2.5rem;
    margin-bottom: 1.2rem;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
    color: var(--primary-color);
}

/* Analysis Bar Chart */
.chart-container {
    margin: 2rem 0;
}
.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.bar-row {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.bar-label {
    width: 30px;
    text-align: right;
    font-weight: bold;
    font-size: 0.9rem;
}
.bar-track {
    flex: 1;
    background: var(--border-color);
    border-radius: 4px;
    height: 20px;
    overflow: hidden;
}
.bar-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: 4px;
    transition: width 1s ease-out;
}
.bar-value {
    width: 40px;
    font-size: 0.8rem;
    color: var(--secondary-text);
}

/* My Records */
.record-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    animation: fadeIn 0.3s ease;
}
.record-item:last-child { border-bottom: none; }
.record-date { font-size: 0.85rem; color: var(--secondary-text); }
.record-numbers { font-weight: bold; color: var(--primary-color); letter-spacing: 1px; }
.btn-delete {
    background: none;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    cursor: pointer;
    font-size: 0.8rem;
}
.btn-delete:hover { background: var(--danger-color); color: white; }

/* Lotto Balls */
.lotto-num-ball {
    display: flex; justify-content: center; align-items: center;
    width: 36px; height: 36px; border-radius: 50%;
    color: white; font-weight: 800; font-size: 0.95rem;
    text-shadow: 0 1px 1px rgba(0,0,0,0.3);
    box-shadow: inset -2px -2px 4px rgba(0,0,0,0.2), 0 2px 4px rgba(0,0,0,0.15);
}
.ball-yellow { background: linear-gradient(135deg, #fbc02d, #f9a825); color: #fff; }
.ball-blue { background: linear-gradient(135deg, #1976d2, #1565c0); }
.ball-red { background: linear-gradient(135deg, #d32f2f, #c62828); }
.ball-gray { background: linear-gradient(135deg, #757575, #616161); }
.ball-green { background: linear-gradient(135deg, #388e3c, #2e7d32); }

/* Common UI */
#generate-btn {
    display: block;
    margin: 0 auto 2rem auto;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover-color));
    color: white; border: none; padding: 1rem 3rem; border-radius: 2rem;
    font-size: 1.1rem; font-weight: 800; cursor: pointer;
    box-shadow: 0 5px 15px rgba(46, 125, 50, 0.2); transition: all 0.2s;
}
#generate-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(46, 125, 50, 0.3); }

#lotto-numbers-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    justify-content: center;
}
@media (min-width: 900px) {
    #lotto-numbers-container {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 1300px) {
    #lotto-numbers-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

.nav-btn {
    display: inline-block; padding: 0.8rem 1.5rem; background-color: var(--container-bg);
    border: 1px solid var(--border-color); color: var(--text-color); text-decoration: none;
    border-radius: 0.8rem; font-weight: 600; transition: all 0.2s;
}
.nav-btn:hover { border-color: var(--primary-color); color: var(--primary-color); transform: translateY(-2px); }

.footer { padding: 3rem 0; text-align: center; border-top: 1px solid var(--border-color); margin-top: 3rem; }
.footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 1rem; }
.footer-links a { color: var(--secondary-text); font-size: 0.9rem; text-decoration: none; }
.copyright { color: var(--secondary-text); font-size: 0.85rem; opacity: 0.7; }

/* Theme Toggle */
#theme-toggle {
    background: transparent; border: 1px solid var(--border-color);
    color: var(--text-color); padding: 0.4rem 0.8rem; border-radius: 2rem;
    cursor: pointer; font-size: 0.8rem; font-weight: 600;
}

/* Fortune Page Specific Styles */
.fortune-container {
    max-width: 600px;
    margin: 0 auto;
}

.glass-card {
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    padding: 2.5rem;
    box-shadow: 0 20px 50px var(--shadow-color);
    backdrop-filter: blur(10px);
}

.fortune-result-card {
    background: linear-gradient(145deg, var(--container-bg), var(--number-bg));
    border: 2px solid var(--primary-color);
    border-radius: 2rem;
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.fortune-result-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--primary-color) 0%, transparent 70%);
    opacity: 0.05;
    pointer-events: none;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 8px solid var(--border-color);
    border-top-color: var(--primary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    background: var(--container-bg);
    box-shadow: 0 10px 20px var(--shadow-color);
}

.color-chip {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    vertical-align: middle;
    margin-right: 0.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.advice-box {
    background: var(--input-bg);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 0 1rem 1rem 0;
    margin: 2rem 0;
    font-style: italic;
    color: var(--secondary-text);
}

/* FAQ Item Styling */
.faq-item {
    background-color: var(--container-bg);
    color: var(--text-color);
    padding: 1.5rem;
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 15px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: transform 0.2s, background-color 0.3s;
}

.faq-item:hover {
    transform: translateY(-3px);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 1rem;
    border: none;
    padding: 0;
    font-size: 1.2rem;
}

.faq-item p, .faq-item ul, .faq-item li {
    color: var(--secondary-text);
    line-height: 1.6;
}

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

/* Global Loading Spinner */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .nav-menu { display: none; } /* Mobile menu simplified */
    .container { padding: 1.5rem; width: 92%; }
    h1 { font-size: 1.8rem; }
    #generate-btn { width: 100%; padding: 1rem; }
}