:root {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --container-bg: #ffffff;
    --container-shadow: rgba(0, 0, 0, 0.1);
    --primary-color: #1877f2;
    --btn-text: #ffffff;
    --input-border: #ddd;
}

[data-theme='dark'] {
    --bg-color: #18191a;
    --text-color: #e4e6eb;
    --container-bg: #242526;
    --container-shadow: rgba(0, 0, 0, 0.5);
    --primary-color: #2d88ff;
    --btn-text: #ffffff;
    --input-border: #444;
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 60px 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    box-sizing: border-box;
}

.container {
    text-align: center;
    padding: 40px;
    border-radius: 15px;
    background-color: var(--container-bg);
    box-shadow: 0 10px 30px var(--container-shadow);
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
    width: 100%;
    max-width: 600px;
    margin-bottom: 30px;
}

.comments-section h2 {
    margin-bottom: 30px;
}

.container:hover {
    transform: translateY(-5px);
}

h1, h2 {
    margin-bottom: 25px;
    color: var(--primary-color);
}

h1 { font-size: 2.2em; }
h2 { font-size: 1.8em; }

#generate {
    padding: 15px 30px;
    font-size: 1.2em;
    color: var(--btn-text);
    background-color: var(--primary-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 15px rgba(24, 119, 242, 0.4);
}

#generate:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.numbers-container {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.number {
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    font-weight: bold;
    color: #ffffff;
    border-radius: 50%;
    background-image: linear-gradient(135deg, #fbc2eb 0%, #a6c1ee 100%);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transform: scale(0);
    animation: popIn 0.5s ease-in-out forwards;
}

/* 제휴 문의 폼 스타일 */
.contact-section form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    height: 120px;
    resize: vertical;
}

#submit-btn {
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

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

/* 테마 토글 버튼 */
.theme-switch-wrapper {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

#theme-toggle {
    background: var(--container-bg);
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

#theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

@keyframes popIn {
    to { transform: scale(1); }
}