:root {
    --bg-color: #f4f7f6;
    --container-bg: white;
    --text-color: #333;
    --shadow-color: rgba(0,0,0,0.1);
    --btn-bg: #4caf50;
    --btn-hover: #45a049;
    --toggle-btn-bg: #eee;
    --toggle-btn-text: #333;
    --input-bg: #fff;
    --input-border: #ddd;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f4f7f6;
    --shadow-color: rgba(0,0,0,0.3);
    --btn-bg: #2e7d32;
    --btn-hover: #1b5e20;
    --toggle-btn-bg: #444;
    --toggle-btn-text: #f4f7f6;
    --input-bg: #3d3d3d;
    --input-border: #555;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
    padding: 2rem 0;
}

.container {
    text-align: center;
    background: var(--container-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
    position: relative;
    width: 90%;
    max-width: 400px;
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
}

#theme-btn {
    padding: 5px 10px;
    font-size: 0.8rem;
    background-color: var(--toggle-btn-bg);
    color: var(--toggle-btn-text);
}

h1 {
    color: var(--text-color);
    margin-bottom: 2rem;
    transition: color 0.3s;
    font-size: 1.5rem;
}

#lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 2rem;
    min-height: 60px;
    flex-wrap: wrap;
}

.ball {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.ball.range-1 { background-color: #fbc02d; }
.ball.range-10 { background-color: #1e88e5; }
.ball.range-20 { background-color: #e53935; }
.ball.range-30 { background-color: #757575; }
.ball.range-40 { background-color: #43a047; }

#draw-btn {
    padding: 10px 25px;
    font-size: 1.1rem;
    background-color: var(--btn-bg);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
    width: 100%;
}

#draw-btn:hover {
    background-color: var(--btn-hover);
}

#draw-btn:active {
    transform: scale(0.98);
}

.divider {
    margin: 2rem 0;
    border: 0;
    border-top: 1px solid var(--input-border);
}

.contact-section h3 {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.input-group {
    margin-bottom: 1rem;
}

.input-group input, 
.input-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    background-color: var(--input-bg);
    color: var(--text-color);
    box-sizing: border-box;
    font-family: inherit;
    font-size: 0.9rem;
}

.input-group textarea {
    height: 80px;
    resize: vertical;
}

#submit-btn {
    width: 100%;
    padding: 12px;
    background-color: #2196f3;
    color: white;
    font-size: 1rem;
    font-weight: bold;
}

#submit-btn:hover {
    background-color: #1e88e5;
}

.comment-section {
    margin-top: 2rem;
    text-align: left;
}

button {
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}