* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 메인 컨테이너 */
.main-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    transition: margin-left 0.3s ease-in-out;
}

.main-container.shifted {
    margin-left: 300px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    max-width: 800px;
    width: 90%;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* 페이지 스타일 */
.page {
    transition: all 0.5s ease-in-out;
    opacity: 1;
    transform: translateX(0);
}

.page.fade-out {
    opacity: 0;
    transform: translateX(-100px);
}

.page.fade-in {
    opacity: 1;
    transform: translateX(0);
}

h1 {
    color: #333;
    margin-bottom: 30px;
    font-size: 2.5em;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    color: #2c3e50;
    font-size: 1.8em;
    margin-bottom: 25px;
    text-align: center;
}

p {
    color: #666;
    font-size: 1.2em;
    line-height: 1.6;
    margin-bottom: 20px;
}

.clickable-text {
    color: #667eea;
    font-weight: bold;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 20px;
    transition: all 0.3s ease;
    position: relative;
    display: inline-block;
}

.clickable-text:hover {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.clickable-text:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

.clickable-text::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.clickable-text:hover::after {
    width: 100%;
}

/* 로딩 스타일 */
.loading {
    text-align: center;
    padding: 40px;
}

.loading h1 {
    margin-bottom: 20px;
}

.loading p {
    color: #999;
    font-style: italic;
}

/* 페이지 전환 애니메이션 */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(-50px);
    }
}

.slide-in {
    animation: slideIn 0.5s ease-out;
}

.slide-out {
    animation: slideOut 0.5s ease-out;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .main-container.shifted {
        margin-left: 0;
    }
    
    .container {
        padding: 30px 20px;
        margin-top: 60px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    p {
        font-size: 1.1em;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px 15px;
        margin-top: 80px;
    }
    
    h1 {
        font-size: 1.8em;
    }
}