:root {
    /* Light Mode Variables */
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --subtitle-color: #666666;
    --game-bg: #f8f9fa;
    --header-color: #222222;
    --plus-color: #999999;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    /* Dark Mode Variables */
    --bg-color: #222222;
    --container-bg: #333333;
    --text-color: #ffffff;
    --subtitle-color: #cccccc;
    --game-bg: #444444;
    --header-color: #eeeeee;
    --plus-color: #cccccc;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Nanum Gothic', 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background-color: var(--container-bg);
    padding: 30px 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 680px;
    text-align: center;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

header {
    margin-bottom: 30px;
    position: relative;
}

.theme-switch-wrapper {
    position: absolute;
    top: -10px;
    right: -10px;
}

.theme-toggle-btn {
    background-color: var(--game-bg);
    color: var(--text-color);
    border: 1px solid var(--plus-color);
    padding: 8px 16px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.theme-toggle-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.theme-icon {
    font-size: 1.1rem;
}

h1 {
    color: var(--header-color);
    font-weight: 800;
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--subtitle-color);
    font-size: 1.1rem;
}

#generate-btn {
    background: linear-gradient(135deg, #fbc400, #f8a500);
    color: #333;
    border: none;
    padding: 15px 35px;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

#generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(251, 196, 0, 0.4);
}

#lotto-games-container {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.lotto-game {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    padding: 15px;
    background-color: var(--game-bg);
    border-radius: 10px;
    transition: background-color 0.3s ease;
}

.bonus-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.bonus-container span {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--plus-color);
}

.partnership-section {
    margin-top: 50px;
    padding-top: 20px;
}

.comment-section {
    margin-top: 50px;
    padding-top: 20px;
}

.comment-section h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--header-color);
}

.divider {
    border: 0;
    height: 1px;
    background: var(--plus-color);
    margin-bottom: 30px;
    opacity: 0.3;
}

.partnership-section h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--header-color);
}

.form-desc {
    font-size: 0.9rem;
    color: var(--subtitle-color);
    margin-bottom: 25px;
}

.partnership-form {
    text-align: left;
    max-width: 450px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--plus-color);
    border-radius: 8px;
    background-color: var(--game-bg);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
    box-sizing: border-box;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #f8a500;
}

.submit-btn {
    width: 100%;
    background-color: var(--text-color);
    color: var(--container-bg);
    border: none;
    padding: 12px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    .theme-switch-wrapper {
        right: 0;
        top: -20px;
    }

    h1 {
        font-size: 2rem;
    }

    #generate-btn {
        padding: 12px 25px;
        font-size: 1.1rem;
    }

    .lotto-game {
        gap: 8px;
        padding: 10px;
    }
}