:root {
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;
    --game-card-bg: #f8f9fa;
    --primary-color: #667eea;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --card-shadow: 0 20px 60px var(--shadow-color);
}

[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --card-bg: #1f2937;
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --game-card-bg: #374151;
    --primary-color: #818cf8;
    --shadow-color: rgba(0, 0, 0, 0.6);
    --card-shadow: 0 20px 60px var(--shadow-color);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 60px 20px;
    gap: 40px;
}

.container {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--card-shadow);
    max-width: 600px;
    width: 100%;
    position: relative;
}

.contact-container h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1.8em;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9em;
    color: var(--text-primary);
}

.form-group input, 
.form-group textarea {
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: var(--game-card-bg);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1em;
    transition: border-color 0.2s, box-shadow 0.2s;
}

[data-theme="dark"] .form-group input, 
[data-theme="dark"] .form-group textarea {
    border: 1px solid #4b5563;
}

.form-group input:focus, 
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.submit-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 15px;
    font-size: 1.1em;
    font-weight: bold;
    border-radius: 12px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s;
    margin-top: 10px;
}

.submit-btn:hover {
    background: #5a67d8;
    transform: translateY(-2px);
}

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

h1 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 2em;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1em;
}

.button-container {
    text-align: center;
    margin-bottom: 30px;
}

#generateBtn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.1em;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    font-weight: bold;
}

[data-theme="dark"] #generateBtn {
    background: linear-gradient(135deg, #818cf8 0%, #6366f1 100%);
}

#generateBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

#generateBtn:active {
    transform: translateY(0);
}

.results {
    display: none;
}

.results.show {
    display: block;
    animation: fadeIn 0.5s ease-in-out;
}

.game {
    background: var(--game-card-bg);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 15px;
    border-left: 5px solid var(--primary-color);
    display: flex;
    align-items: center;
    gap: 15px;
}

.game-title {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 1.1em;
    min-width: 60px;
}

.numbers {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.number {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 1.1em;
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* 로또 번호 색상 */
.number.yellow { background: #fbc400; }
.number.blue { background: #69c8f2; }
.number.red { background: #ff7272; }
.number.gray { background: #aaaaaa; }
.number.green { background: #b0d840; }

.notice {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9em;
    color: var(--text-muted);
}

/* 테마 전환 버튼 스타일 */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-bg);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    font-size: 1.5rem;
}

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

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 1.5em;
    }

    .number {
        width: 40px;
        height: 40px;
        font-size: 1em;
    }

    .game {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .game-title {
        min-width: auto;
    }
}