/* 사이드바 스타일 */
.sidebar {
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100vh;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    z-index: 1000;
    transition: left 0.3s ease-in-out;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
}

.sidebar.open {
    left: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h3 {
    font-size: 1.5em;
    color: #ecf0f1;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 2em;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s ease;
}

.close-btn:hover {
    color: #3498db;
}

.sidebar-nav {
    padding: 20px 0;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li {
    margin: 0;
}

.nav-link {
    display: block;
    padding: 15px 20px;
    color: #ecf0f1;
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: #3498db;
    color: #3498db;
    transform: translateX(5px);
}

.nav-link.active {
    background: rgba(52, 152, 219, 0.2);
    border-left-color: #3498db;
    color: #3498db;
}

/* 메뉴 토글 버튼 */
.menu-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 999;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 5px;
    padding: 10px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.menu-toggle:hover {
    background: white;
    transform: scale(1.05);
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: #2c3e50;
    transition: all 0.3s ease;
}

.menu-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.open span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .sidebar {
        width: 280px;
        left: -280px;
    }
    
    .menu-toggle {
        top: 15px;
        left: 15px;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 100%;
        left: -100%;
    }
    
    .nav-link {
        padding: 20px;
        font-size: 1.1em;
    }
}