.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transform: translateX(-100%);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
}

.sidebar.active {
    transform: translateX(0);
}

.sidebar-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
}

.sidebar-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.sidebar-header h2 i {
    font-size: 18px;
}

.sidebar-user-info {
    padding: 12px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.sidebar-user-info .user-greeting {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-close {
    background: var(--bg-tertiary);
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
}

.sidebar-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
    transform: scale(1.1);
}

.sidebar.closed .sidebar-close {
    transform: rotate(0deg);
    background: var(--primary-color);
    color: white;
    font-size: 0;
}

.sidebar.closed .sidebar-close:hover {
    background: var(--primary-hover);
    transform: scale(1.15);
}

.sidebar.closed .sidebar-close::before {
    content: '→';
    position: absolute;
    font-size: 14px;
    font-weight: bold;
    opacity: 1;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 14px 0;
}

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

.sidebar-nav li {
    margin: 0 0 2px 0;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    padding: 14px 24px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    font-size: 15px;
    font-weight: 500;
    border-left: 3px solid transparent;
}

.sidebar-nav .nav-link:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.sidebar-nav .nav-link.active {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    font-weight: 600;
}

.sidebar-nav .nav-link i {
    margin-right: 10px;
    width: 20px;
    font-size: 19px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-footer {
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.btn-logout, .btn-login {
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    width: 100%;
}

.btn-logout:hover, .btn-login:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 999;
    display: none;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    display: block;
}

/* 관리자 사이드바는 사용자 사이드바와 동일한 스타일 사용 */

@media (min-width: 1200px) {
    .sidebar {
        transform: translateX(0);
        width: 280px;
    }
    .sidebar.closed {
        transform: translateX(calc(-100% + 60px));
        width: 60px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .sidebar.closed .sidebar-header h2 span {
        opacity: 0;
        width: 0;
        overflow: hidden;
        white-space: nowrap;
    }
    .sidebar.closed .sidebar-header h2 i {
        opacity: 0;
        width: 0;
        overflow: hidden;
        white-space: nowrap;
    }
    .sidebar.closed .sidebar-header h2 {
        justify-content: center;
    }
    .sidebar.closed .sidebar-user-info {
        opacity: 0;
        height: 0;
        padding: 0;
        overflow: hidden;
        border-bottom: none;
    }
    .sidebar.closed .sidebar-user-info .user-greeting {
        opacity: 0;
        width: 0;
        overflow: hidden;
        white-space: nowrap;
    }
    .sidebar.closed .sidebar-nav .nav-link span {
        opacity: 0;
        width: 0;
        overflow: hidden;
        white-space: nowrap;
        display: inline-block;
    }
    .sidebar.closed .sidebar-footer .btn-logout,
    .sidebar.closed .sidebar-footer .btn-login {
        opacity: 0;
        width: 0;
        overflow: hidden;
        white-space: nowrap;
        padding: 0;
        border: none;
    }
    .sidebar.closed .sidebar-header {
        justify-content: center;
        padding: 20px 12px;
    }
    .sidebar.closed .sidebar-nav .nav-link {
        justify-content: center;
        padding: 14px;
    }
    .sidebar.closed .sidebar-nav .nav-link i {
        margin-right: 0;
        font-size: 21px;
    }
    .sidebar.closed {
        cursor: pointer;
    }
    .sidebar.closed:hover {
        background-color: rgba(0, 0, 0, 0.02);
    }
    .sidebar.closed .sidebar-footer {
        padding: 20px 12px;
    }
    .sidebar-overlay {
        display: none !important;
    }
    body:not(.sidebar-closed) .main-container {
        margin-left: 280px;
        transition: margin-left 0.3s ease;
    }
    body.sidebar-closed .main-container {
        margin-left: 60px;
        transition: margin-left 0.3s ease;
    }
    body.sidebar-closed .menu-toggle {
        display: none;
    }
}

@media (max-width: 1199px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .main-container {
        margin-left: 0;
    }
}