:root {
    /* Light Mode Variables */
    --background-color: #f8f9fa;
    --text-color: #212529;
    --card-background: #ffffff;
    --card-border: #e9ecef;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --secondary-text: #6c757d;
    --row-bg: #f1f3f5;
    
    /* Ball Colors (Remain consistent but can be adjusted) */
    --ball-n1: #fbc400;
    --ball-n11: #69c8f2;
    --ball-n21: #ff7285;
    --ball-n31: #aaaaaa;
    --ball-n41: #b0d840;
}

[data-theme="dark"] {
    /* Dark Mode Variables */
    --background-color: #121212;
    --text-color: #f8f9fa;
    --card-background: #1e1e1e;
    --card-border: #333333;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --secondary-text: #adb5bd;
    --row-bg: #252525;
}

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: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-background);
    border: 1px solid var(--card-border);
    color: var(--text-color);
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    font-size: 20px;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

h2 {
    margin-bottom: 30px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.lotto-container {
    background: var(--card-background);
    padding: 30px;
    border-radius: 24px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--card-border);
    max-width: 500px;
    width: 100%;
    transition: all 0.3s ease;
}

.row {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    padding: 12px;
    border-radius: 16px;
    background: var(--row-bg);
    transition: all 0.3s ease;
}

.row:last-child {
    margin-bottom: 0;
}

.label {
    font-weight: 600;
    margin-right: 15px;
    min-width: 60px;
    color: var(--secondary-text);
    font-size: 14px;
}

.balls-container {
    display: flex;
    gap: 8px;
}

.ball {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 14px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s ease;
}

.ball:hover {
    transform: translateY(-2px);
}

.n1 { background-color: var(--ball-n1); }
.n11 { background-color: var(--ball-n11); }
.n21 { background-color: var(--ball-n21); }
.n31 { background-color: var(--ball-n31); }
.n41 { background-color: var(--ball-n41); }

.generate-btn {
    margin-top: 30px;
    padding: 14px 40px;
    font-size: 16px;
    font-weight: 600;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
    transition: all 0.3s ease;
}

.generate-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
}

.generate-btn:active {
    transform: translateY(0);
}