:root {
    --bg-color: #f8f9fa;
    --text-color: #333;
    --card-bg: #ffffff;
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --border-color: #ddd;
    --ball-bg: #f0f0f0;
    --ball-text: #333;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f8f9fa;
    --card-bg: #2d2d2d;
    --primary-color: #64b5f6;
    --primary-hover: #90caf9;
    --border-color: #444;
    --ball-bg: #444;
    --ball-text: #fff;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 600px;
    width: 100%;
    text-align: center;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 1.5rem;
}

.btn-theme {
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-primary {
    padding: 12px 24px;
    border-radius: 8px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 30px;
    width: 100%;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.lotto-results {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.lotto-set {
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: flex;
    justify-content: center;
    gap: 10px;
    animation: fadeIn 0.5s ease-out;
}

.ball {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--ball-bg);
    color: var(--ball-text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.1rem;
    border: 1px solid var(--border-color);
}

.ball.color1 { background-color: #fbc400; color: #fff; border: none; }
.ball.color2 { background-color: #69c8f2; color: #fff; border: none; }
.ball.color3 { background-color: #ff7272; color: #fff; border: none; }
.ball.color4 { background-color: #aaa; color: #fff; border: none; }
.ball.color5 { background-color: #b0d840; color: #fff; border: none; }

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